// list installed packages
// cell list -> list packages installed in this package
// cell list all -> list all packages (including those that are there due to installed packages)
// cell list package <name> -> list the packages for the package <name>

var shop = use('shop')
var pkg = use('package')

var mode = 'local'
var target_pkg = null

if (args && args.length > 0) {
    if (args[0] == 'all') {
        mode = 'all'
    } else if (args[0] == 'shop') {
        mode = 'shop'
    } else if (args[0] == 'package') {
        if (args.length < 2) {
            log.console("Usage: cell list package <name>")
            $_.stop()
            return
        }
        mode = 'package'
        target_pkg = args[1]
    } else {
        log.console("Usage:")
        log.console("  cell list             : list local packages")
        log.console("  cell list all         : list all recursive packages")
        log.console("  cell list package <name>: list dependencies of <name>")
        log.console("  cell list shop        : list all packages in shop")
        $_.stop()
        return
    }
}

if (mode == 'local') {
    log.console("Installed Packages (Local):")
    print_deps(null)
} else if (mode == 'package') {
    // Resolve alias to canonical package path
    var canon = shop.get_canonical_package(target_pkg, null)
    if (!canon) {
        log.console("Package '" + target_pkg + "' not found in local dependencies.")
    } else {
        log.console("Dependencies for " + target_pkg + " (" + canon + "):")
        print_deps(canon)
    }
} else if (mode == 'all') {
    log.console("All Packages:")
    var all = shop.list_packages(null)
    // list_packages returns an array of package strings (locators)
    // We want to perhaps sort them
    all.sort()
    for (var i = 0; i < all.length; i++) {
        log.console("  " + all[i])
    }
    if (all.length == 0) log.console("  (none)")
} else if (mode == 'shop') {
    log.console("Shop Packages:")
    var all = shop.list_packages()
    
    if (all.length == 0)
        log.console("  (none)")
    else
        all.forEach(package => log.console("  " + package))
}

function print_deps(ctx) {
    var deps = pkg.dependencies(ctx)
    var aliases = []
    for (var k in deps) aliases.push(k)
    aliases.sort()

    if (aliases.length == 0) {
        log.console("  (none)")
    } else {
        for (var i = 0; i < aliases.length; i++) {
            var alias = aliases[i]
            var locator = deps[alias]
            log.console("  " + alias + " -> " + locator)
        }
    }
}

$_.stop()