var toml = use('toml')
var json = use('json')
var fd = use('fd')
var http = use('http')
var miniz = use('miniz')
var time = use('time')
var js = use('js')
var crypto = use('crypto')
var utf8 = use('utf8')
var blob = use('blob')
var build_utils = use('build')

// a package string is what is used to import a module, like prosperon/sprite
// in prosperon/sprite, sprite is the module, and prosperon is the package (usually, an alias)
// a canonical package name relates prosperon to its source, like gitea.pockle.world/john/prosperon

var Shop = {}

// Global shop path - this is where all packages, builds, and cache are stored
// Located at ~/.cell on the user's machine
var global_shop_path = null

// Current package context - the package we're running from (resolved from program path)
var current_package_path = null

var SCOPE_LOCAL = 0
var SCOPE_PACKAGE = 1
var SCOPE_CORE = 2

var MOD_EXT = '.cm'
var ACTOR_EXT = '.ce'

var dylib_ext = '.so' // Default extension

var os
var use_cache
var platform
var $_

// Initialize the global shop path
function init_global_shop() {
  if (global_shop_path) return global_shop_path
  
  var home = os.getenv('HOME')
  if (!home) {
    // Try Windows-style
    home = os.getenv('USERPROFILE')
  }
  if (!home) {
    throw new Error('Could not determine home directory. Set HOME environment variable.')
  }
  
  global_shop_path = home + '/.cell'
  
  // Verify the shop exists
  if (!fd.is_dir(global_shop_path)) {
    throw new Error('Cell shop not found at ' + global_shop_path + '. Run "cell install" to set up.')
  }
  
  return global_shop_path
}

// Get the global shop path
Shop.get_shop_path = function() {
  return init_global_shop()
}

// Find the package directory containing a file by looking for cell.toml
// Returns the absolute path to the package directory, or null if not in a package
Shop.find_package_dir = function(file_path) {
  if (!file_path) return null
  
  // Walk up directories looking for cell.toml
  var dir = file_path
  if (fd.is_file(dir)) {
     // if it's a file, start from parent
     var last_slash = dir.lastIndexOf('/')
     if (last_slash > 0) dir = dir.substring(0, last_slash)
  }
  
  while (dir && dir.length > 0) {
    var toml_path = dir + '/cell.toml'
    if (fd.is_file(toml_path)) {
      return fd.realpath(dir)
    }
    var last_slash = dir.lastIndexOf('/')
    if (last_slash <= 0) break
    dir = dir.substring(0, last_slash)
  }
  
  // Check current directory as fallback
  if (fd.is_file('cell.toml')) {
    return fd.realpath('.')
  }
  
  return null
}

// Link a local package into the shop
function ensure_package_link(abs_path) {
  if (!abs_path || !abs_path.startsWith('/')) return false
  
  var packages_dir = get_modules_dir()
  var target_link = packages_dir + abs_path
  
  // If link already exists and points to correct place, we are good
  if (fd.is_link(target_link)) {
    var points_to = fd.readlink(target_link)
    if (points_to == abs_path) {
        update_local_lock(abs_path)
        return true
    }
    // Incorrect link, remove it
    fd.unlink(target_link)
  } else if (fd.is_dir(target_link)) {
    // If it's a real directory, that's weird for a local package mirror, but let's assume it might be a copy?
    // User wants symlinks. 
    // If it's not a link, maybe we should leave it or warn?
    // Use user instructions: "shop should ... ensure it's there ... symlink local dirs"
    // safely assuming we can replace if it's not the right thing might be dangerous if user put real files there.
    // For now, if it's a dir, check if it's the package itself?
    // simpler: proceed to link logic
  }

  // Create parent dirs
  var parent = target_link.substring(0, target_link.lastIndexOf('/'))
  ensure_dir(parent)
  
  try {
    fd.symlink(abs_path, target_link)
    // log.console("Linked " + abs_path + " -> " + target_link)
    update_local_lock(abs_path)
    return true
  } catch (e) {
    log.error("Failed to link package " + abs_path + ": " + e)
    return false
  }
}

function update_local_lock(abs_path) {
    var lock = Shop.load_lock()
    var name = abs_path.split('/').pop()
    
    // Check if we can find a better name from cell.toml
    var toml_path = abs_path + '/cell.toml'
    if (fd.is_file(toml_path)) {
        // We could parse it, but for now directory name is usually the package alias
    }
    
    lock[name] = {
        package: abs_path,
        type: 'local',
        updated: time.number()
    }
    Shop.save_lock(lock)
}

Shop.ensure_package_link = ensure_package_link

// Set the current package context from a program path
Shop.set_current_package = function(program_path) {
  current_package_path = Shop.find_package_dir(program_path)
  
  if (current_package_path && current_package_path.startsWith('/')) {
    // It's a local package, ensure it is linked in the shop
    ensure_package_link(current_package_path)
  }
  
  return current_package_path
}

// Get the current package path
Shop.get_current_package = function() {
  return current_package_path
}

Shop.set_os = function(o, $guy)
{
  os = o
  $_ = $guy
  use_cache = os.use_cache
  
  platform = os.platform()
  if (platform == 'macOS') dylib_ext = '.dylib'
  else if (platform == 'Windows') dylib_ext = '.dll'
  
  // Initialize the global shop
  init_global_shop()
}

var config = null

// Get the config path for a package
// If package_path is null, uses current_package_path
function get_config_path(package_path) {
  if (package_path) {
    return package_path + '/cell.toml'
  }
  if (current_package_path) {
    return current_package_path + '/cell.toml'
  }
  // Fallback to current directory
  return 'cell.toml'
}

// Get the lock file path (in the global shop)
function get_lock_path() {
  return global_shop_path + '/lock.toml'
}

// Get the packages directory (in the global shop)
function get_modules_dir() {
  return global_shop_path + '/packages'
}

// Get the cache directory (in the global shop)
function get_cache_dir() {
  return global_shop_path + '/cache'
}

// Get the build directory (in the global shop)
function get_global_build_dir() {
  return global_shop_path + '/build'
}

// Get the core directory (in the global shop)
Shop.get_core_dir = function() {
  return global_shop_path + '/core'
}

// Get the links file path (in the global shop)
function get_links_path() {
  return global_shop_path + '/link.toml'
}

// Get the reports directory (in the global shop)
Shop.get_reports_dir = function() {
  return global_shop_path + '/reports'
}

var open_dl = {}

function get_import_package(name) {
  var parts = name.split('/')
  if (parts.length > 1)
    return parts[0]

  return null
}

Shop.file_info = function(file) {
  var info = {
    path: file,
    is_module: false,
    is_actor: false,
    package: null,
    name: null
  }
  
  if (file.endsWith(MOD_EXT)) {
    info.is_module = true
  } else if (file.endsWith(ACTOR_EXT)) {
    info.is_actor = true
  }
  
  // Strip extension for name
  var name_without_ext = file
  if (info.is_module) {
    name_without_ext = file.substring(0, file.length - MOD_EXT.length)
  } else if (info.is_actor) {
    name_without_ext = file.substring(0, file.length - ACTOR_EXT.length)
  }
  
    // Check if file is in a package (in global shop packages dir)
    var packages_prefix = get_modules_dir() + '/'
    if (file.startsWith(packages_prefix)) {
      var rest = file.substring(packages_prefix.length)
      
      // Get all packages and find which one matches this path
      // With the new structure, everything in packages/ is a package
      // gitea.pockle.world/user/repo/file.cm
      
      var parts = rest.split('/')
      // Heuristic: packages form is host/user/repo
      if (parts.length >= 3) {
         var pkg_path = parts.slice(0, 3).join('/')
         info.package = pkg_path
         if (rest.length > pkg_path.length) {
            info.name = rest.substring(pkg_path.length + 1)
         } else {
            info.name = "" // root?
         }
      } else {
         // fallback
         info.package = rest
      }
      
      if (info.name) {
         if (info.is_module && info.name.endsWith(MOD_EXT))
            info.name = info.name.substring(0, info.name.length - MOD_EXT.length)
         if (info.is_actor && info.name.endsWith(ACTOR_EXT))
            info.name = info.name.substring(0, info.name.length - ACTOR_EXT.length)
      }

    } else {
        // Check if it's in any other package via cell.toml lookup
        var pkg_dir = Shop.find_package_dir(file)
        if (pkg_dir) {
           info.package = pkg_dir
           if (file.startsWith(pkg_dir + '/')) {
               var rel = file.substring(pkg_dir.length + 1)
               info.name = rel
               if (info.is_module && info.name.endsWith(MOD_EXT))
                  info.name = info.name.substring(0, info.name.length - MOD_EXT.length)
               if (info.is_actor && info.name.endsWith(ACTOR_EXT))
                  info.name = info.name.substring(0, info.name.length - ACTOR_EXT.length)
           }
        } else {
           info.package = 'local' // Should we keep 'local' for truly orphan files?
           info.name = name_without_ext
        }
    }
  
  return info
}

function get_import_name(path)
{
  var parts = path.split('/')
  if (parts.length < 2) return null
  return parts.slice(1).join('/')
}

// given a path, get a full package import
// ie, 'prosperon/sprite' would return 'gitea.pockle.world/john/prosperon/sprite'
// if prosperon were a dependency
function get_path_in_package(path, ctx)
{
  var pkg = get_import_package(path)
  var mod_name = get_import_name(path)
  if (!pkg) return null

  var canon_pkg = get_canonical_package(pkg, ctx)
  return canon_pkg + "/" + mod_name
}

function get_normalized_package(path, ctx)
{
  var pkg = get_import_package(path)
  if (!pkg) return null
  return get_canonical_package(pkg, ctx)
}

// taking the package into account, find the canonical name
function get_canonical_package(mod, ctx) {
  var cfg = Shop.load_config(ctx)

  if (!cfg || !cfg.dependencies)
    return null

  var pkg = cfg.dependencies[mod]
  if (!pkg)
    return null

  var parsed = Shop.parse_package(pkg)
  if (!parsed)
    return null

  return parsed.path
}

function get_import_dl(name) {
  var pkg = get_import_package(name)
  if (!pkg) return null
  if (open_dl[pkg]) return open_dl[pkg]
  var dlpath = get_modules_dir() + '/' + pkg + '/' + pkg + dylib_ext
  var dl = os.dylib_open(dlpath)
  if (dl) {
    open_dl[pkg] = dl
    return dl
  }
  return null
}

Shop.get_c_symbol = function get_c_symbol(name) {
  var dl = get_import_dl(name)
  var symname = `js_${name.replace('/', '_')}_use`

  if (dl)
    return os.dylib_symbol(dl, symname)
  else
    return os.load_internal(symname)
}

// Use ensure_dir from build_utils
var ensure_dir = build_utils.ensure_dir

Shop.load_config = function(module) {
  var content
  var config_path
  if (!module) {
    config_path = get_config_path()
    if (!fd.is_file(config_path))
      return null
    content = fd.slurp(config_path)
  } else {
    // Module config is at <modules_dir>/<module>/cell.toml
    var module_path = get_modules_dir() + '/' + module + '/cell.toml'
    if (!fd.is_file(module_path))
      return null
    
    content = fd.slurp(module_path)
  }

  if (!(content instanceof blob)) {
    log.console(`critical error`)
    for (var k in content)
      log.console(k)
    throw new Error("fucked up bad")
  }

  if (!content.length) return {}
  var cfg = toml.decode(text(content))
  if (cfg.dependencies) {
    var changed = false
    for (var k in cfg.dependencies) {
      if (cfg.dependencies[k].startsWith('https://')) {
        cfg.dependencies[k] = cfg.dependencies[k].substring(8)
        changed = true
      } else if (cfg.dependencies[k].includes('://')) {
        // If it has another protocol, we should probably strip it too or warn
        // But for now assuming mostly https/http
        var parts = cfg.dependencies[k].split('://')
        if (parts.length == 2) {
          cfg.dependencies[k] = parts[1]
          changed = true
        }
      }
    }
    
    if (changed && !module) {
      Shop.save_config(cfg)
    }
  }
  return cfg
}

// Save cell.toml configuration
Shop.save_config = function(config) {
  var config_path = get_config_path()
  fd.slurpwrite(config_path, utf8.encode(toml.encode(config)));
}

// Load lock.toml configuration (from global shop)
Shop.load_lock = function() {
  var path = get_lock_path()
  
  if (!fd.is_file(path))
    return {}
  
  var content = text(fd.slurp(path))
  if (!content.length) return {}
  
  var lock = toml.decode(content)
  var changed = false
  
  // Clean lock file entries
  for (var key in lock) {
    var entry = lock[key]
    if (entry && entry.package && entry.package.includes('://')) {
      var parts = entry.package.split('://')
      entry.package = parts[1]
      changed = true
    }
    
    // Also clean keys if they are locators/packages with protocols
    if (key.includes('://')) {
      var parts = key.split('://')
      var new_key = parts[1]
      lock[new_key] = entry
      delete lock[key]
      changed = true
    }
  }
  
  if (changed) {
    Shop.save_lock(lock)
  }
  
  return lock
}

// Save lock.toml configuration (to global shop)
Shop.save_lock = function(lock) {
  var path = get_lock_path()
  ensure_dir(global_shop_path)
  fd.slurpwrite(path, utf8.encode(toml.encode(lock)));
}

var link_cache = null
Shop.load_links = function() {
  if (link_cache) return link_cache
  var path = get_links_path()
  if (!fd.is_file(path)) {
    link_cache = {}
    return link_cache
  }
  
  try {
    var content = text(fd.slurp(path))
    var cfg = toml.decode(content)
    link_cache = cfg.links || {}
  } catch (e) {
    log.console("Warning: Failed to load link.toml: " + e)
    link_cache = {}
  }
  return link_cache
}

Shop.save_links = function(links) {
  link_cache = links
  var cfg = { links: links }
  var path = get_links_path()
  ensure_dir(global_shop_path)
  fd.slurpwrite(path, utf8.encode(toml.encode(cfg)))
}

Shop.add_link = function(canonical, target) {
  var links = Shop.load_links()
  links[canonical] = target
  Shop.save_links(links)
  log.console("Linked " + canonical + " -> " + target)
  return true
}

Shop.remove_link = function(canonical) {
  var links = Shop.load_links()
  if (!links[canonical]) return false
  delete links[canonical]
  Shop.save_links(links)
  log.console("Unlinked " + canonical)
  return true
}

Shop.clear_links = function() {
  Shop.save_links({})
  log.console("Cleared all links")
  return true
}

// Parse module package string (e.g., "git.world/jj/mod@v0.6.3")
Shop.parse_package = function(pkg) {
  Shop.verify_package_name(pkg)
  var path = pkg
  var version = null

  // Extract version if present
  if (path.includes('@')) {
    var versionParts = path.split('@')
    path = versionParts[0]
    version = versionParts[1]
  }
  
  // Check for links
  var links = Shop.load_links()
  if (links[path]) {
    path = links[path]
  }
  
  // Handle absolute paths (local modules)
  // /User/john/mod -> User/john/mod
  if (path.startsWith('/')) {
    path = path.substring(1)
  }
  
  // Extract name (last part of path)
  var name = path.split('/').pop()
  
  return {
    path,
    name,
    version
  }
}

// Get information about how to resolve a package
Shop.resolve_package_info = function(pkg) {
  // Check links first
  // We need to check the raw package string against links
  // But we also need to handle the case where pkg is already a local path
  // If pkg is "gitea...", check if it's linked
  
  var path = pkg
  if (path.includes('@')) path = path.split('@')[0]
  
  var links = Shop.load_links()
  if (links[path]) {
    var resolved = links[path]
    if (resolved.startsWith('/')) {
        return { type: 'local', path: resolved }
    }
    return { type: 'package', path: resolved }
  }

  if (pkg.startsWith('/')) {
    return { type: 'local', path: pkg }
  }
  if (pkg.includes('gitea.')) {
    return { type: 'gitea' }
  }
  
  // If it looks like a path but isn't absolute, might be relative in future, but for now strict
  return { type: 'unknown' }
}

// Resolve a filesystem path to a package identifier in the shop
Shop.resolve_path_to_package = function(path_str) {
  var abs = fd.realpath(path_str)
  if (!abs) return null
  
  var modules_dir = get_modules_dir()
  
  // Case 1: Path is inside the modules directory (e.g. downloaded package)
  if (abs.startsWith(modules_dir + '/')) {
    var rel = abs.substring(modules_dir.length + 1)
    // Remove trailing slash if any
    if (rel.endsWith('/')) rel = rel.substring(0, rel.length - 1)
    return rel
  }
  
  // Case 2: Path is a local directory linked into the shop
  // Local links are stored as modules_dir + abs_path (mirrored)
  var target = modules_dir + abs
  if (fd.is_dir(target)) {
    if (abs.startsWith('/')) return abs.substring(1)
    return abs
  }
  
  // Case 3: Path is not linked. Return null.
  return null
}

// Verify if a package name is valid and return status
Shop.verify_package_name = function(pkg) {
  if (!pkg) throw new Error("Empty package name")
  if (pkg == 'local') throw new Error("local is not a valid package name")
  if (pkg == 'core') throw new Error("core is not a valid package name")
  
  if (pkg.includes('://'))
    throw new Error(`Invalid package name: ${pkg}; did you mean ${pkg.split('://')[1]}?`)
}

// Convert module package to download URL
Shop.get_download_url = function(pkg, commit_hash) {
  var info = Shop.resolve_package_info(pkg)
  if (info.type == 'local') return null

  var parsed = Shop.parse_package(pkg)
  if (!parsed) return null

  if (parsed.path.includes('gitea.')) {
    var parts = parsed.path.split('/')
    var host = parts[0]
    var user = parts[1]
    var repo = parts[2]
    
    if (!commit_hash) {
      log.error("No commit hash available for download URL")
      return null
    }
    
    return 'https://' + host + '/' + user + '/' + repo + '/archive/' + commit_hash + '.zip'
  }

  return null
}

// Remove a dependency
Shop.remove_dependency = function(alias) {
  var config = Shop.load_config()
  if (!config) {
    log.error("No cell.toml found")
    return false
  }
  
  if (!config.dependencies || !config.dependencies[alias]) {
    return false
  }
  
  delete config.dependencies[alias]
  Shop.save_config(config)
  return true
}

// Get the API URL for checking remote git commits
Shop.get_api_url = function(pkg) {
  var info = Shop.resolve_package_info(pkg)
  if (info.type == 'local') return null

  var parsed = Shop.parse_package(pkg)
  if (!parsed) return null

  var parts = parsed.path.split('/')
  // Gitea pattern: gitea.pockle.world/user/repo@branch
  if (parsed.path.includes('gitea.')) {
    var host = parts[0]
    var user = parts[1]
    var repo = parts[2]
    var url = 'https://' + host + '/api/v1/repos/' + user + '/' + repo + '/branches/'
    if (parsed.version) url += parsed.version
    return url
  }
  
  return null
}

// Extract commit hash from API response
Shop.extract_commit_hash = function(pkg, response) {
  if (!response) return null

  var data = json.decode(response)

  if (pkg.includes('gitea.')) {
    // Gitea: response.commit.id
    if (Array.isArray(data))
      data = data[0]
    return data.commit && data.commit.id
  }
  
  return null
}

// Get the module directory for a given alias
Shop.get_module_dir = function(alias) {
  var config = Shop.load_config()
  if (!config || !config.dependencies || !config.dependencies[alias]) {
    return null
  }
  
  var pkg = config.dependencies[alias]
  var parsed = Shop.parse_package(pkg)
  if (!parsed) return null
  
  return get_modules_dir() + '/' + parsed.path
}

function lock_package(loc)
{
  var lock = Shop.load_lock()
  
}

Shop.check_cache = function(pkg) {
  var parsed = Shop.parse_package(pkg)
  if (!parsed) return null

  var cache_path = get_cache_dir() + '/' + parsed.path + '.zip'
  if (fd.is_file(cache_path)) {
    log.console("Found cached zip: " + cache_path)
    return true
  }

  return false
}

var open_dls = {}

// for script forms, path is the canonical path of the module
var script_forms = []

// Construct a descriptive compile name with extension preserved.
// Formats:
//   core:<module path>
//   <package>:<module path>   (package is the full canonical package name)
//   local:<module path>
//   package:<module path>     (fallback when pkg isn't provided but path is under modules)
function make_compile_name(path, rel_path, pkg, scope) {
  if (scope == SCOPE_CORE) return 'core:' + rel_path
  if (pkg) return pkg + ':' + rel_path
  var modules_dir = get_modules_dir()
  if (path && path.startsWith(modules_dir + '/')) return 'package:' + rel_path
  return 'local:' + rel_path
}

script_forms['.cm'] = function(path, script, pkg) {
  var pkg_arg = pkg ? `'${pkg}'` : 'null'
  var relative_use_fn = `def use = function(path) { return globalThis.use(path, ${pkg_arg});}`
  var fn = `(function setup_module($_){ ${relative_use_fn}; ${script}})`
  return fn
}

script_forms['.ce'] = function(path, script, pkg) {
  var pkg_arg = pkg ? `'${pkg}'` : 'null'
  var relative_use_fn = `def use = function(path) { return globalThis.use(path, ${pkg_arg});}`
  return `(function start($_, arg) { ${relative_use_fn}; var args = arg; ${script} ; })`
}

// Get flags from config
function get_flags(config, platform, key) {
  var flags = ''
  if (config.compilation && config.compilation[key]) {
    flags += config.compilation[key]
  }
  if (config.compilation && config.compilation[platform] && config.compilation[platform][key]) {
    if (flags != '') flags += ' '
    flags += config.compilation[platform][key]
  }
  return flags
}

Shop.get_flags = get_flags

function get_build_dir(pkg) {
  if (!pkg) pkg = current_package_path
  if (!pkg) return get_global_build_dir() + '/local' // Fallback for non-package scripts

  // If pkg is absolute path, mirror it
  if (pkg.startsWith('/')) {
    // Accio folder should be .cell/packages/Users/...
    // But build should be .cell/build/packages/Users/...
    return get_global_build_dir() + '/packages' + pkg
  }
  
  // Otherwise it's a relative package path (from packages dir)
  return get_global_build_dir() + '/packages/' + pkg
}

Shop.get_build_dir = get_build_dir

function get_rel_path(path, pkg) {
  if (!pkg) {
    // For local files, strip the current package path prefix if present
    if (current_package_path && path.startsWith(current_package_path + '/')) {
      return path.substring(current_package_path.length + 1)
    }
    return path
  }
  
  var prefix
  if (pkg.startsWith('/')) {
     prefix = pkg + '/'
  } else {
     prefix = get_modules_dir() + '/' + pkg + '/'
  }

  if (path.startsWith(prefix)) {
    return path.substring(prefix.length)
  }
  return path
}

function resolve_mod_fn(path, pkg)
{
  if (!fd.is_file(path)) throw new Error(`path ${path} is not a file`)
  var rel_path = get_rel_path(path, pkg)
  
  // Determine build directory based on context
  var build_dir
  if (pkg) {
    build_dir = get_build_dir(pkg)
  } else if (current_package_path) {
    // Local file in current package - use package path (strip leading /)
    var pkg_id = current_package_path.substring(1) // Remove leading /
    build_dir = get_global_build_dir() + '/' + pkg_id
  } else {
    build_dir = get_build_dir('local')
  }
  
  var cache_path = build_dir + '/' + rel_path + '.o'
  
  if (fd.is_file(cache_path) && fd.stat(path).mtime <= fd.stat(cache_path).mtime) {
    var obj = fd.slurp(cache_path)
    var fn = js.compile_unblob(obj)
    return js.eval_compile(fn)
  }

  var ext = path.substring(path.lastIndexOf('.'))
  var script_form = script_forms[ext]
  if (!script_form) throw new Error(`No script form for extension ${ext}`)

  var compile_name = make_compile_name(path, rel_path, pkg, pkg ? SCOPE_PACKAGE : SCOPE_LOCAL)

  var script = script_form(path, text(fd.slurp(path)), pkg)
  var fn = js.compile(compile_name, script)
  ensure_dir(cache_path.substring(0, cache_path.lastIndexOf('/')))
  fd.slurpwrite(cache_path, js.compile_blob(fn))
  return js.eval_compile(fn)
}

// Resolve and cache a core module
function resolve_core_mod_fn(core_path, rel_path) {
  var build_dir = get_global_build_dir() + '/core'
  var cache_path = build_dir + '/' + rel_path + '.o'
  
  if (fd.is_file(cache_path) && fd.stat(core_path).mtime <= fd.stat(cache_path).mtime) {
    var obj = fd.slurp(cache_path)
    var fn = js.compile_unblob(obj)
    return js.eval_compile(fn)
  }
  
  var ext = core_path.substring(core_path.lastIndexOf('.'))
  var form = script_forms[ext]
  if (!form) throw new Error(`No script form for extension ${ext}`)
  
  var compile_name = make_compile_name(core_path, rel_path, null, SCOPE_CORE)
  var script = form(null, text(fd.slurp(core_path)))
  var fn = js.compile(compile_name, script)
  ensure_dir(cache_path.substring(0, cache_path.lastIndexOf('/')))
  fd.slurpwrite(cache_path, js.compile_blob(fn))
  return js.eval_compile(fn)
}

function resolve_locator(path, ext, ctx)
{  
  // In static_only mode, only look in the embedded pack
  var static_only = cell.static_only
  
  if (!static_only) {
    // First, check if file exists in current package directory
    if (current_package_path) {
      var pkg_local_path = current_package_path + '/' + path + ext
      if (fd.is_file(pkg_local_path)) {
        var fn = resolve_mod_fn(pkg_local_path, null)
        return {path: pkg_local_path, scope: SCOPE_LOCAL, symbol:fn}
      }
    }
    
    // Check CWD for local file
    var local_path
    if (ctx)
      local_path = get_modules_dir() + '/' + ctx + '/' + path + ext
    else
      local_path = path + ext
      
    if (fd.is_file(local_path)) {
      var fn = resolve_mod_fn(local_path, ctx)
      return {path: local_path, scope: SCOPE_LOCAL, symbol:fn}
    }

    // Check installed packages
    var canonical_pkg = get_normalized_package(path, ctx)
    var pkg_path = get_path_in_package(path, ctx)
    var mod_path = get_modules_dir() + '/' + pkg_path + ext
    if (fd.is_file(mod_path)) {
      var fn = resolve_mod_fn(mod_path, canonical_pkg)
      return {path: mod_path, scope: SCOPE_PACKAGE, symbol:fn}
    }
  }

  // Check core directory for core modules
  var core_dir = Shop.get_core_dir()
  
  // For packages, try the full package path first in core
  if (ctx) {
    var pkg_rel = ctx + '/' + path + ext
    var pkg_core_path = core_dir + '/' + pkg_rel
    if (fd.is_file(pkg_core_path)) {
      var fn = resolve_core_mod_fn(pkg_core_path, pkg_rel)
      return {path: pkg_rel, scope: SCOPE_CORE, symbol:fn};
    }
  }
  
  // Check core directory for the module
  // Core scripts are now in .cell/core/scripts
  var core_dir = Shop.get_core_dir()
  var core_file_path = core_dir + '/scripts/' + path + ext
  if (path == 'text') log.console("Checking core mod: " + core_file_path + " exists: " + fd.is_file(core_file_path))
  if (fd.is_file(core_file_path)) {
    var fn = resolve_core_mod_fn(core_file_path, path + ext)
    return {path: path + ext, scope: SCOPE_CORE, symbol:fn};
  }

  return null;
}

function c_sym_path(path)
{
  return path.replace(/\//g, '_').replace(/\\/g, '_').replace(/\./g, '_').replace(/-/g, '_')
}

function resolve_c_symbol(path, package_context)
{
  var static_only = cell.static_only
  var local_path = package_context ? package_context : 'local'
  var local_sym_base = c_sym_path(path)
  var local
  
  function symbol_candidates(pkg_path, mod_sym) {
    var variants = []
    var paths = [pkg_path]
    if (!pkg_path.startsWith('/')) paths.push('/' + pkg_path)
    for (var i = 0; i < paths.length; i++) {
      var candidate = `js_${c_sym_path(paths[i])}_${mod_sym}_use`
      if (variants.indexOf(candidate) < 0)
        variants.push(candidate)
    }
    return variants
  }
  
  if (!package_context) {
     local = `js_local_${local_sym_base}_use`
  } else {
     local = null // handled via candidates below
  }
  
  // First check for statically linked/internal symbols
  var local_candidates = package_context ? symbol_candidates(local_path, local_sym_base) : [local]
  for (var li = 0; li < local_candidates.length; li++) {
    var lc = local_candidates[li]
    if (os.internal_exists(lc))
      return {
        symbol: function() { return os.load_internal(lc); }, 
        scope: SCOPE_LOCAL,
        path: lc
      };
  }

  // In static_only mode, skip dynamic library lookups
  if (!static_only) {
    // Then try dynamic library
    var build_dir = get_build_dir(package_context)
    var local_dl_name = build_dir + '/cellmod' + dylib_ext
    
    if (fd.is_file(local_dl_name)) {
      if (!open_dls[local_dl_name])
        open_dls[local_dl_name] = os.dylib_open(local_dl_name);
      
      if (open_dls[local_dl_name]) {
        var locals = package_context ? symbol_candidates(local_path, local_sym_base) : [local]
        for (var i = 0; i < locals.length; i++) {
          var candidate = locals[i]
          if (os.dylib_has_symbol(open_dls[local_dl_name], candidate))
            return {
              symbol: function() { return os.dylib_symbol(open_dls[local_dl_name], candidate); },
              scope: SCOPE_LOCAL,
              path: candidate
            };
        }
      }
    }
  }

  // If 'path' has a package alias (e.g. 'prosperon/sprite'), try to resolve it
  var pkg_alias = get_import_package(path)
  if (pkg_alias) {
      var canon_pkg = get_normalized_package(path, package_context)
      if (canon_pkg) {
          var mod_name = get_import_name(path)
          var mod_sym = mod_name.replace(/\//g, '_').replace(/-/g, '_').replace(/\./g, '_')
          var sym_names = symbol_candidates(canon_pkg, mod_sym)
          
          // First check internal/static symbols for package
          for (var sii = 0; sii < sym_names.length; sii++) {
            var sym_name = sym_names[sii]
            if (os.internal_exists(sym_name))
              return {
                symbol: function() { return os.load_internal(sym_name) }, 
                scope: SCOPE_PACKAGE, 
                package: canon_pkg,
                path: sym_name
              };
          }
          
          // Then try dynamic library for package (skip in static_only mode)
          if (!static_only) {
            var pkg_build_dir = get_build_dir(canon_pkg)
            var dl_path = pkg_build_dir + '/cellmod' + dylib_ext
            if (fd.is_file(dl_path)) {
                if (!open_dls[dl_path]) open_dls[dl_path] = os.dylib_open(dl_path)
                if (open_dls[dl_path]) {
                    for (var si = 0; si < sym_names.length; si++) {
                      var sym_name = sym_names[si]
                      if (os.dylib_has_symbol(open_dls[dl_path], sym_name))
                        return {
                          symbol: function() { return os.dylib_symbol(open_dls[dl_path], sym_name) },
                          scope: SCOPE_PACKAGE, 
                          package: canon_pkg,
                          path: sym_name
                        }
                    }
                }
            }
          }
      }
  }
  
  var core_sym = `js_${path.replace(/\//g, '_')}_use`;
  if (os.internal_exists(core_sym))
    return {
      symbol: function() { return os.load_internal(core_sym); }, 
      scope: SCOPE_CORE,
      path: core_sym
    };

  return null
}

function resolve_module_info(path, package_context) {
  var c_resolve = resolve_c_symbol(path, package_context) || {scope:999}
  var mod_resolve = resolve_locator(path, '.cm', package_context) || {scope:999}
  var min_scope = Math.min(c_resolve.scope, mod_resolve.scope)

  if (min_scope == 999)
    return null

  var resolved_path
  if (mod_resolve.scope != 999) resolved_path = mod_resolve.path
  else resolved_path = c_resolve.path

  var cache_scope = min_scope == SCOPE_CORE ? 2 : 0
  var cache_key
  if (min_scope == SCOPE_CORE)
    cache_key = `2::${path}`
  else
    cache_key = `${text(cache_scope)}::${resolved_path}`

  cache_key = cache_key.replace('//', '/')

  return {
    cache_key: cache_key,
    c_resolve: c_resolve,
    mod_resolve: mod_resolve,
    min_scope: min_scope
  }
}

function get_module_cache_key(path, package_context) {
  var info = resolve_module_info(path, package_context)
  return info ? info.cache_key : null
}

Shop.is_loaded = function(path, package_context) {
  var cache_key = get_module_cache_key(path, package_context)
  return use_cache[cache_key] != null
}

function execute_module(info)
{
  var c_resolve = info.c_resolve
  var mod_resolve = info.mod_resolve
  var cache_key = info.cache_key

  var used

  if (c_resolve.scope < mod_resolve.scope)
    used = c_resolve.symbol(null, $_)
  else if (mod_resolve.scope < c_resolve.scope)
    used = mod_resolve.symbol.call(null, $_)
  else
    used = mod_resolve.symbol.call(c_resolve.symbol(), $_)

  if (!used)
    throw new Error(`Module ${json.encode(info)} returned null`)

  return used
}

function get_module(path, package_context) {
  var info = resolve_module_info(path, package_context)

  if (!info)
    throw new Error(`Module ${path} could not be found in ${package_context}`)

  return execute_module(info)
}

// first looks in local
// then in dependencies
// then in core
// package_context: optional package context to resolve relative paths within
Shop.use = function(path, package_context) {
  var info = resolve_module_info(path, package_context)
  if (!info)
    throw new Error(`Module ${path} could not be found in ${package_context}`)

  if (use_cache[info.cache_key])
    return use_cache[info.cache_key]

  use_cache[info.cache_key] = execute_module(info)
  return use_cache[info.cache_key]
}

Shop.resolve_locator = resolve_locator

// Get cache path for a package and commit
function get_cache_path(pkg, commit) {
  var parsed = Shop.parse_package(pkg)
  if (!parsed) return null
  
  var slug = parsed.path.split('/').join('_')
  return get_cache_dir() + '/' + slug + '_' + commit + '.zip'
}

function rm_recursive(path) {
  try {
    fd.rm(path)
  } catch (e) {
    log.error("Failed to remove " + path + ": " + e)
  }
}

function get_all_files(dir, prefix, results) {
  prefix = prefix || ""
  results = results || []
  
  var list = fd.readdir(dir)
  if (!list) return results
  
  for (var i = 0; i < list.length; i++) {
    var item = list[i]
    if (item == '.' || item == '..') continue
    
    var full_path = dir + "/" + item
    var rel_path = prefix ? prefix + "/" + item : item
    
    var st = fd.stat(full_path)
    if (st.isDirectory) {
      get_all_files(full_path, rel_path, results)
    } else {
      results.push(rel_path)
    }
  }
  return results
}


// Verify zip contents against target directory
function verify_zip_contents(zip, target_dir) {
  var count = zip.count()
  var expected_files = {}
  for (var i = 0; i < count; i++) {
    if (zip.is_directory(i)) continue
    var filename = zip.get_filename(i)
    var parts = filename.split('/')
    if (parts.length > 1) {
      parts.shift()
      var rel_path = parts.join('/')
      expected_files[rel_path] = true
      
      var full_path = target_dir + '/' + rel_path
      if (!fd.is_file(full_path)) return false
      
      var content_zip = zip.slurp(filename)
      var content_disk = fd.slurp(full_path)
      
      if (content_zip.length != content_disk.length) return false
      
      var hash_zip = text(crypto.blake2(content_zip), 'h')
      var hash_disk = text(crypto.blake2(content_disk), 'h')
      
      if (hash_zip != hash_disk) return false
    }
  }
  
  // Check for extra files
  var existing_files = get_all_files(target_dir)
  for (var i = 0; i < existing_files.length; i++)
    if (!expected_files[existing_files[i]]) return false
  
  return true
}

// High-level: Add a package, install it, and install all transitive dependencies
// Like `bun add` or `npm install <pkg>`
Shop.get = function(pkg, alias) {
  if (fd.is_dir(pkg)) {
    log.console("Found directory: " + pkg)
    pkg = fd.realpath(pkg)
    log.console("Resolved to: " + pkg)
  }
  var info = Shop.resolve_package_info(pkg)
  if (info.type == 'unknown') {
    log.error("Could not resolve package: " + pkg)
    return false
  }
  var parsed = Shop.parse_package(pkg)
  if (!alias) alias = parsed.name
  
  log.console("Adding dependency: " + alias + " = " + pkg)
  
  // Add to config
  var config = Shop.load_config() || { dependencies: {} }
  if (!config.dependencies) config.dependencies = {}
  config.dependencies[alias] = pkg
  Shop.save_config(config)
  return true
}

// Update a specific package
Shop.update = function(pkg) {
  var config = Shop.load_config()
  var lock = Shop.load_lock()
  var parsed = Shop.parse_package(pkg)
  var info = Shop.resolve_package_info(pkg)
  var target_dir = get_modules_dir() + '/' + parsed.path
  
  var result = info.type == 'local' 
    ? update_local(pkg, info, target_dir)
    : update_remote(pkg, info, target_dir, lock[pkg])
  
  if (!result) {
    log.error("Failed to update " + parsed.path)
    return false
  }
  
  lock[pkg] = {
    package: pkg,
    commit: result.commit,
    zip_hash: result.zip_hash,
    updated: time.number()
  }
  Shop.save_lock(lock)
  log.console("Updated " + parsed.path + ".")
  return true
}

function update_local(pkg, info, target_dir) {
  if (fd.is_link(target_dir)) {
    if (fd.readlink(target_dir) == info.path)
      return { commit: "local", package: pkg, zip_hash: "local" }
    else
      fd.unlink(target_dir)
  }

  var parent_dir = target_dir.substring(0, target_dir.lastIndexOf('/'))
  ensure_dir(parent_dir)
  
  if (fd.is_dir(target_dir)) fd.rmdir(target_dir)
  
  try {
    fd.symlink(info.path, target_dir)
    log.console("Linked " + target_dir + " -> " + info.path)
    return { commit: "local", package: pkg, zip_hash: "local" }
  } catch(e) {
    log.error("Failed to create symlink: " + e)
    return null
  }
}

function update_remote(pkg, info, target_dir, lock_info) {
  var local_hash = lock_info ? lock_info.commit : null
  var remote_hash = fetch_remote_hash(pkg)
  
  if (!remote_hash && !local_hash) {
    log.error("Could not resolve commit for " + pkg)
    return null
  }
  
  var target_hash = remote_hash || local_hash
  
  if (local_hash == target_hash) {
    log.console(pkg + " is already up to date.")
    return lock_info
  }
  
  if (local_hash)
    log.console("Updating " + pkg + " " + local_hash.substring(0,8) + " -> " + target_hash.substring(0,8))
  else
    log.console("Installing " + pkg + "...")
  
  var zip_blob = get_or_download_zip(pkg, target_hash)
  if (!zip_blob) return null
  
  var zip_hash = text(crypto.blake2(zip_blob), 'h')
  install_zip(zip_blob, target_dir)
  
  return { commit: target_hash, package: pkg, zip_hash: zip_hash }
}

function fetch_remote_hash(pkg) {
  var api_url = Shop.get_api_url(pkg)
  if (!api_url) return null
  
  try {
    var resp = http.fetch(api_url)
    return Shop.extract_commit_hash(pkg, text(resp))
  } catch (e) {
    log.console("Warning: Could not check for updates for " + pkg)
    return null
  }
}

function get_or_download_zip(pkg, commit_hash) {
  var cache_path = get_cache_path(pkg, commit_hash)
  
  if (fd.is_file(cache_path)) {
    log.console("Found cached zip: " + cache_path)
    try {
      return fd.slurp(cache_path)
    } catch (e) {
      log.error("Failed to read cache: " + e)
    }
  }
  
  var download_url = Shop.get_download_url(pkg, commit_hash)
  if (!download_url) {
    log.error("Could not determine download URL for " + pkg)
    return null
  }
  
  log.console("Downloading from " + download_url)
  try {
    var zip_blob = http.fetch(download_url)
    ensure_dir(cache_path.substring(0, cache_path.lastIndexOf('/')))
    fd.slurpwrite(cache_path, zip_blob)
    log.console("Cached to " + cache_path)
    return zip_blob
  } catch (e) {
    log.error(e)
    return null
  }
}

function install_zip(zip_blob, target_dir) {
  var zip = miniz.read(zip_blob)
  if (!zip) throw new Error("Failed to read zip archive")
  
  if (fd.is_link(target_dir)) fd.unlink(target_dir)
  
  log.console("Syncing to " + target_dir)
  ensure_dir(target_dir)
  
  var zip_files = {}
  var count = zip.count()
  
  for (var i = 0; i < count; i++) {
    if (zip.is_directory(i)) continue
    var filename = zip.get_filename(i)
    var parts = filename.split('/')
    if (parts.length <= 1) continue
    
    parts.shift()
    var rel_path = parts.join('/')
    zip_files[rel_path] = { index: i, filename: filename }
  }
  
  var existing_files = fd.is_dir(target_dir) ? get_all_files(target_dir) : []
  
  for (var i = 0; i < existing_files.length; i++) {
    var rel_path = existing_files[i]
    if (!zip_files[rel_path]) {
      var full_path = target_dir + '/' + rel_path
      log.console("Removing " + rel_path)
      fd.rm(full_path)
    }
  }
  
  for (var rel_path in zip_files) {
    var zip_info = zip_files[rel_path]
    var full_path = target_dir + '/' + rel_path
    var dir_path = full_path.substring(0, full_path.lastIndexOf('/'))
    
    var zip_content = zip.slurp(zip_info.filename)
    var needs_write = true
    
    if (fd.is_file(full_path)) {
      var disk_content = fd.slurp(full_path)
      if (disk_content.length == zip_content.length && disk_content.length != 0) {
        var hash_zip = text(crypto.blake2(zip_content), 'h')
        var hash_disk = text(crypto.blake2(disk_content), 'h')
        if (hash_zip == hash_disk) {
          needs_write = false
        }
      }
    }
    
    if (needs_write) {
      ensure_dir(dir_path)
      log.console("Writing " + rel_path)
      fd.slurpwrite(full_path, zip_content)
    }
  }
}

// High-level: Remove a package and clean up
// Like `bun remove`
Shop.remove = function(alias_or_path) {
  var config = Shop.load_config()
  var is_dependency = config && config.dependencies && config.dependencies[alias_or_path]
  
  var target_pkg = null
  var locator = null
  
  if (is_dependency) {
     locator = config.dependencies[alias_or_path]
     var parsed = Shop.parse_package(locator)
     target_pkg = parsed.path
     
     // Remove from config
     delete config.dependencies[alias_or_path]
     Shop.save_config(config)
  } else {
     // Check if it's a resolvable path
     var resolved = Shop.resolve_path_to_package(alias_or_path)
     if (resolved) {
        target_pkg = resolved
     } else {
        // Check if alias_or_path exists directly in modules dir?
        var direct_path = get_modules_dir() + '/' + alias_or_path
        if (fd.exists(direct_path)) {
             target_pkg = alias_or_path
        }
     }
  }

  if (!target_pkg) {
      log.error("Package/Dependency not found: " + alias_or_path)
      return false
  }

  var target_dir = get_modules_dir() + '/' + target_pkg
  
  // Remove from lock
  var lock = Shop.load_lock()
  var lock_changed = false
  
  if (locator && lock[locator]) {
      delete lock[locator]
      lock_changed = true
  }
  if (lock[alias_or_path]) {
      delete lock[alias_or_path]
      lock_changed = true
  }
  
  // Scan for any entry pointing to this target
  for (var k in lock) {
      if (lock[k].package == target_pkg || lock[k].package == '/' + target_pkg) {
          delete lock[k]
          lock_changed = true
      }
  }
  
  if (lock_changed) Shop.save_lock(lock)
  
  // Remove directory
  if (fd.is_link(target_dir)) {
    log.console("Unlinking " + target_dir)
    fd.unlink(target_dir)
  } else if (fd.is_dir(target_dir)) {
    log.console("Removing " + target_dir)
    fd.rmdir(target_dir)
  }
  
  log.console("Removed " + (is_dependency ? alias_or_path : target_pkg))
  return true
}

Shop.add_replacement = function(alias, replacement) {
  var config = Shop.load_config()
  if (!config) config = {}
  if (!config.replace) config.replace = {}
  
  config.replace[alias] = replacement
  Shop.save_config(config)
  
  log.console("Added replacement: " + alias + " = " + replacement)
  return true
}

Shop.remove_replacement = function(alias) {
  var config = Shop.load_config()
  if (!config || !config.replace || !config.replace[alias]) {
      log.error("No replacement found for " + alias)
      return false
  }
  
  delete config.replace[alias]
  Shop.save_config(config)
 
  log.console("Removed replacement for " + alias)
  log.console("Run 'cell update " + alias + "' to restore the package.")
  return true
}

// Compile a module
// List all files in a package
Shop.list_files = function(pkg) {
  var dir
  if (!pkg) dir = current_package_path || '.'
  else dir = get_modules_dir() + '/' + pkg
  
  var files = []
  
  var walk = function(current_dir, current_prefix) {
    var list = fd.readdir(current_dir)
    if (!list) return
    
    for (var i = 0; i < list.length; i++) {
      var item = list[i]
      if (item == '.' || item == '..') continue
      if (item.startsWith('.')) continue 
      
      // Skip build directories in root
      if (!pkg && (item == 'build' || item == 'build_dbg' || item == 'build_release' || item == 'build_web' || item == 'build_fast')) continue
      if (!pkg && item == 'cell_modules') continue // Just in case

      var full_path = current_dir + "/" + item
      var rel_path = current_prefix ? current_prefix + "/" + item : item
      
      var st = fd.stat(full_path)
      if (st.isDirectory) {
        walk(full_path, rel_path)
      } else {
        files.push(rel_path)
      }
    }
  }
  
  if (fd.is_dir(dir)) {
    walk(dir, "")
  }
  return files
}

Shop.get_c_objects = function(pkg) {
  var files = Shop.list_files(pkg)
  var objects = []
  var build_dir = get_build_dir(pkg)
  
  for (var i=0; i<files.length; i++) {
    var file = files[i]
    if (file.endsWith('.c') || file.endsWith('.cpp')) {
       objects.push(build_dir + '/' + file + '.o')
    }
  }
  return objects
}

Shop.compile_module = function(alias) {
  var module_dir = Shop.get_module_dir(alias)
  if (!module_dir) {
    log.error("Module not found: " + alias)
    return false
  }
  
  log.console("Would compile module: " + alias + " from " + module_dir)
  return true
}

var debug = use('debug')

Shop.module_reload = function(path, package) {
  if (!Shop.is_loaded(path,package)) return
  var info = resolve_module_info(path, package)
  if (!info) return

  var cache_key = info.cache_key
  var old = use_cache[cache_key]
  var newmod = get_module(path, package)

  for (var i in newmod)
    old[i] = newmod[i]

  for (var i in old) {
    if (!(i in newmod))
      old[i] = null
  }
}

Shop.build_package = function(package)
{
  if (package == 'local') package = null
  if (package) package = Shop.parse_package(package).path
  var files = Shop.list_files(package)
  var build_dir = get_build_dir(package)
  ensure_dir(build_dir)
  
  var module_dir = package ? get_modules_dir() + '/' + package : (current_package_path || '.')

  log.console(`Building package ${package ? package : 'local'} to ${build_dir}`)

  // For C compilation
  var config = Shop.load_config(package) || {}
  var cflags = get_flags(config, platform, 'CFLAGS')

  // Determine usage prefix for C symbols
  var use_prefix
  if (!package) use_prefix = 'js_local_'
  else use_prefix = 'js_' + package.replace(/\//g, '_').replace(/\./g, '_').replace(/-/g, '_') + '_'

  var c_objects = []
  
  // Use get_hash from build_utils
  var get_hash = build_utils.get_hash

  for (var i=0; i<files.length; i++) {
    var file = files[i]
    var src_path
    if (!package) {
       src_path = (current_package_path || '.') + '/' + file
    } else if (package.startsWith('/')) {
       // Local absolute package
       src_path = package + '/' + file
    } else {
       // Regular package
       src_path = get_modules_dir() + '/' + package + '/' + file
    }
    
    if (file.endsWith('.cm') || file.endsWith('.ce')) {
        // Compile module
        try {
          resolve_mod_fn(src_path, package)
        } catch (e) {
          log.error(`Failed to compile ${src_path}: ${e}`)
          log.error(e)
          return false
        }
    } else if (file.endsWith('.c') || file.endsWith('.cpp')) {
        // Compile C
        var obj_path = build_dir + '/' + file + '.o'
        var meta_path = obj_path + '.meta'
        ensure_dir(obj_path.substring(0, obj_path.lastIndexOf('/')))
        
        var safe_path = c_sym_path(file.substring(0, file.lastIndexOf('.')))
        var use_name = use_prefix + safe_path + '_use'
        var comp_src = file
        var comp_obj = file + '.o'
        var base_cmd = 'cc -fPIC '
        var compile_flags = '-c ' + comp_src + ' -O3 -DCELL_USE_NAME=' + use_name
        if (cflags != '') compile_flags += ' ' + cflags
        
        var full_compile_cmd = 'cd ' + module_dir + ' && ' + base_cmd + compile_flags + ' -o ' + comp_obj
        var cmd_hash = get_hash(full_compile_cmd)
        
        var needs_compile = true
        var meta = null
        
        if (fd.is_file(obj_path) && fd.is_file(meta_path)) {
             try {
               meta = json.decode(text(fd.slurp(meta_path)))
             } catch(e) {}
             
             if (meta && meta.cmd_hash == cmd_hash) {
                 var st_src = fd.stat(src_path)
                 var st_obj = fd.stat(obj_path)
                 
                 if (st_src && st_obj && st_src.mtime <= st_obj.mtime) {
                     needs_compile = false
                     
                     // Check headers
                     if (meta.headers) {
                         for (var h = 0; h < meta.headers.length; h++) {
                             var header_rel = meta.headers[h]
                             var header_full
                             if (header_rel.startsWith('/'))
                               header_full = header_rel
                             else
                               header_full = module_dir + '/' + header_rel
                             if (!fd.is_file(header_full)) {
                                log.console(`coulnd't find header ${header_full}`)
                                 needs_compile = true; break;
                             }
                             var st_h = fd.stat(header_full)
                             if (st_h.mtime > st_obj.mtime) {
                              log.console(`${header_full} out of date`)
                                 needs_compile = true; break;
                             }
                         }
                     }
                 }
             }
        }
        
        if (needs_compile) {
            log.console("Compiling " + src_path + " -> " + obj_path)
            
            // 1. Generate dependencies
            var deps_file = comp_obj + '.d'
            // Use same flags but with -M
            var deps_cmd = 'cd ' + module_dir + ' && ' + base_cmd + '-MM ' + compile_flags + ' > ' + deps_file
            os.system(deps_cmd)
            
            var headers = []
            var deps_full_path = module_dir + '/' + deps_file
            
            if (fd.is_file(deps_full_path)) {
                var deps_content = text(fd.slurp(deps_full_path))
                deps_content = deps_content.replace(/\\\n/g, ' ').replace(/\\\r\n/g, ' ').replace(/\n/g, ' ')
                
                var parts = deps_content.split(' ')
                for (var p=0; p<parts.length; p++) {
                    var part = parts[p].trim()
                    if (part == '' || part.endsWith(':')) continue
                    if (part == comp_src) continue
                    headers.push(part)
                }
                fd.rm(deps_full_path)
            }
            
            // 2. Compile
            var ret = os.system(full_compile_cmd)
            if (ret != 0) {
                log.error("Compilation failed for " + src_path)
                return false
            }
            
            // 3. Move object
            os.system('mv ' + module_dir + '/' + comp_obj + ' ' + obj_path)
            
            // 4. Write meta
            var new_meta = {
                cmd_hash: cmd_hash,
                headers: headers
            }
            fd.slurpwrite(meta_path, utf8.encode(json.encode(new_meta)))
        }
        c_objects.push(obj_path)
    }
  }
  
  // Link if there are C objects
  if (c_objects.length > 0) {
      var lib_name = build_dir + '/cellmod' + dylib_ext
      var lib_meta_path = lib_name + '.meta'
      
      var link_flags = '-fPIC -shared'
      
      var ldflags = get_flags(config, platform, 'LDFLAGS')
      if (ldflags != '') link_flags += ' ' + ldflags
      
      var temp_lib = 'cellmod' + dylib_ext
      var objs_str = ''
      for (var i=0; i<c_objects.length; i++) {
          objs_str += '"' + c_objects[i] + '" '
      }

      var link_cmd = 'cd ' + module_dir + ' && cc ' + link_flags + ' ' + objs_str + ' -lcell_runtime -lc -lc++ -o ' + temp_lib
      var link_cmd_hash = get_hash(link_cmd)

      // Check if we need to relink
      var needs_link = true
      
      if (fd.is_file(lib_name) && fd.is_file(lib_meta_path)) {
          var meta = null
          try {
             meta = json.decode(text(fd.slurp(lib_meta_path)))
          } catch(e) {}
          
          if (meta && meta.cmd_hash == link_cmd_hash) {
              var lib_time = fd.stat(lib_name).mtime
              needs_link = false
              for (var i=0; i<c_objects.length; i++) {
                  if (fd.stat(c_objects[i]).mtime > lib_time) {
                      needs_link = true
                      break
                  }
              }
          }
      }

      if (needs_link) {
          log.console("Linking " + lib_name)
          
          var ret = os.system(link_cmd)
          if (ret != 0) {
              log.error("Linking failed")
              return false
          }
          os.system('mv ' + module_dir + '/' + temp_lib + ' ' + lib_name)
          
          fd.slurpwrite(lib_meta_path, utf8.encode(json.encode({ cmd_hash: link_cmd_hash })))
      }
      log.console("Built " + lib_name)
  }
  
  return true
}

// Get dependencies for a specific context (package canonical path)
// If ctx is null, returns dependencies for the local project
Shop.dependencies = function(ctx) {
  var config = Shop.load_config(ctx)
  if (!config || !config.dependencies) {
    return {}
  }
  return config.dependencies
}

Shop.list_packages = function(root)
{
  var queue = []
  var processed = {}
  var result = []
  
  var deps = Shop.dependencies(root)
  for (var alias in deps) {
    var pkg = deps[alias]
    if (!processed[pkg]) {
      queue.push(pkg)
    }
  }
  
  while (queue.length > 0) {
    var pkg = queue.shift()
    if (processed[pkg]) continue
    processed[pkg] = true
    
    result.push(pkg)
    
    var parsed = Shop.parse_package(pkg)
    var pkg_config = Shop.load_config(parsed.path)
    
    if (pkg_config && pkg_config.dependencies) {
      for (var alias in pkg_config.dependencies) {
        var dep_pkg = pkg_config.dependencies[alias]
        if (!processed[dep_pkg]) {
          queue.push(dep_pkg)
        }
      }
    }
  }
  
  return result
}

// List all .cm and .ce files in a package
// If ctx is null, lists local files
// If ctx is a canonical path, lists files in that module
Shop.list_modules = function(ctx) {
  var files = Shop.list_files(ctx)
  var modules = []
  for (var i=0; i<files.length; i++) {
    var f = files[i]
    if (f.endsWith('.cm') || f.endsWith('.ce')) {
      modules.push(f)
    }
  }
  return modules
}

// Resolve a module path given a package context
// Returns { path, package_name } or null if not found
// Resolution order:
//   1. Local to the current package (if package_name is set)
//   2. Declared dependencies (by alias)
//   3. Core modules (handled by caller)
Shop.resolve_module = function(module_name, package_name, is_file_fn) {
  var config = Shop.load_config()
  var dependencies = (config && config.dependencies) || {}
  
  // If we're in a package context, check the package first
  if (package_name) {
    var pkg_path = get_modules_dir() + '/' + package_name + '/' + module_name + '.cm'
    if (is_file_fn(pkg_path)) {
      return { path: pkg_path, package_name: package_name }
    }
  }
  
  // Check if module_name contains a slash (explicit package reference)
  if (module_name.includes('/')) {
    var parts = module_name.split('/')
    var pkg_alias = parts[0]
    var sub_module = parts.slice(1).join('/')
    
    // Check if it's a declared dependency
    if (dependencies[pkg_alias]) {
      // Need to resolve alias to canonical path
      var pkg = dependencies[pkg_alias]
      var parsed = Shop.parse_package(pkg)
      var canonical_path = parsed.path
      
      var dep_path = get_modules_dir() + '/' + canonical_path + '/' + sub_module + '.cm'
      if (is_file_fn(dep_path)) {
        return { path: dep_path, package_name: pkg_alias }
      }
    }
    
    // Check local path (relative to current package)
    var local_base = current_package_path || '.'
    var local_path = local_base + '/' + module_name + '.cm'
    if (is_file_fn(local_path)) {
      return { path: local_path, package_name: null }
    }
  } else {
    // Simple module name - check local first, then dependencies
    var local_base = current_package_path || '.'
    var local_path = local_base + '/' + module_name + '.cm'
    if (is_file_fn(local_path)) {
      return { path: local_path, package_name: null }
    }
    
    // Check each declared dependency for this module
    for (var alias in dependencies) {
      var pkg = dependencies[alias]
      var parsed = Shop.parse_package(pkg)
      var canonical_path = parsed.path
      
      var dep_path = get_modules_dir() + '/' + canonical_path + '/' + module_name + '.cm'
      if (is_file_fn(dep_path)) {
        return { path: dep_path, package_name: alias }
      }
    }
  }
  
  return null
}

Shop.resolve_alias = function(name, ctx) {
  var deps = Shop.dependencies(ctx)
  if (deps && deps[name]) return { alias: name, pkg: Shop.get_canonical_package(name, ctx) }

  for (var alias in deps) {
    var pkg = deps[alias]
    var parsed = Shop.parse_package(pkg)
    if (parsed && (parsed.name == name || parsed.path == name)) {
      return { alias: alias, pkg: parsed.path }
    }
  }
  return null
}

Shop.get_canonical_package = get_canonical_package

Shop.upgrade_core = function() {
  var pkg = "gitea.pockle.world/john/cell"
  var hash = fetch_remote_hash(pkg)
  
  if (!hash) {
      // Fallback to master?
      log.console("Could not fetch remote hash for core, assuming master.")
      hash = "master"
  }
  
  var zip = get_or_download_zip(pkg, hash)
  if (!zip) return false
  
  var core_dir = Shop.get_core_dir()
  install_zip(zip, core_dir)
  
  var lock = Shop.load_lock()
  lock['core'] = {
      package: pkg,
      commit: hash,
      updated: time.number()
  }
  Shop.save_lock(lock)
  
  log.console("Core updated to " + hash)
  return true
}

Shop.link_core = function(target) {
    if (!fd.is_dir(target)) return false
    var core_dir = Shop.get_core_dir()
    
    if (fd.is_link(core_dir)) fd.unlink(core_dir)
    else if (fd.is_dir(core_dir)) {
        // Safety check?
        // For now, we assume user knows what they are doing.
        // We can't easily rm recursive if it's a real dir unless we use system rm or implement it.
        // shop.cm has rm_recursive? No, I implemented it?
        // I saw `function rm_recursive` at line 1141. internal.
        rm_recursive(core_dir)
    }
    
    fd.symlink(fd.realpath(target), core_dir)
    
    var lock = Shop.load_lock()
    lock['core'] = {
        package: fd.realpath(target),
        type: 'local',
        updated: time.number()
    }
    Shop.save_lock(lock)
    return true
}

Shop.unlink_core = function() {
    var core_dir = Shop.get_core_dir()
    if (fd.is_link(core_dir)) {
        fd.unlink(core_dir)
        return true
    }
    return false
}

Shop.is_core_linked = function() {
    var core_dir = Shop.get_core_dir()
    return fd.is_link(core_dir)
}

Shop.list_shop_packages = function() {
    var lock = Shop.load_lock()
    var list = []
    for (var k in lock) {
        if (lock[k]) list.push(lock[k])
    }
    return list
}

return Shop