#ifdef _WIN32
#include <windows.h>
#endif

#define WOTA_IMPLEMENTATION
#include "wota.h"

#define STB_DS_IMPLEMENTATION
#include "stb_ds.h"

#include "cell.h"
#include "cell_internal.h"

#define ENGINE "internal/engine.cm"
#define CELL_SHOP_DIR ".cell"
#define CELL_CORE_DIR "packages/core"

#include <signal.h>
#include <unistd.h>
#include <sys/stat.h>

cell_rt *root_cell = NULL;
static char *core_path = NULL;

// Get the home directory
static const char* get_home_dir(void) {
  const char *home = getenv("HOME");
  if (!home) {
    home = getenv("USERPROFILE"); // Windows fallback
  }
  return home;
}

// Find and verify the cell shop at ~/.cell
int find_cell_shop(void)
{
  const char *home = get_home_dir();
  if (!home) {
    printf("ERROR: Could not determine home directory. Set HOME environment variable.\n");
    return 0;
  }

  // Build path to ~/.cell/core
  size_t path_len = strlen(home) + strlen("/" CELL_SHOP_DIR "/" CELL_CORE_DIR) + 1;
  core_path = malloc(path_len);
  if (!core_path) {
    printf("ERROR: Could not allocate memory for core path\n");
    return 0;
  }
  snprintf(core_path, path_len, "%s/" CELL_SHOP_DIR "/" CELL_CORE_DIR, home);

  // Check if the core directory exists
  struct stat st;
  if (stat(core_path, &st) != 0 || !S_ISDIR(st.st_mode)) {
    printf("ERROR: Cell shop not found at %s/" CELL_SHOP_DIR "\n", home);
    printf("Run 'cell install' to set up the cell environment.\n");
    free(core_path);
    core_path = NULL;
    return 0;
  }

  return 1;
}

// Load a file from the core directory
static char* load_core_file(const char *filename, size_t *out_size) {
  if (!core_path) return NULL;
  
  size_t path_len = strlen(core_path) + 1 + strlen(filename) + 1;
  char *full_path = malloc(path_len);
  if (!full_path) return NULL;
  
  snprintf(full_path, path_len, "%s/%s", core_path, filename);
  
  FILE *fh = fopen(full_path, "rb");
  free(full_path);
  
  if (!fh) return NULL;
  
  fseek(fh, 0, SEEK_END);
  long file_size = ftell(fh);
  fseek(fh, 0, SEEK_SET);
  
  char *data = malloc(file_size + 1);
  if (!data) {
    fclose(fh);
    return NULL;
  }
  
  if (fread(data, 1, file_size, fh) != (size_t)file_size) {
    free(data);
    fclose(fh);
    return NULL;
  }
  
  fclose(fh);
  data[file_size] = 0;
  
  if (out_size) *out_size = file_size;
  return data;
}

// Get the core path for use by scripts
const char* cell_get_core_path(void) {
  return core_path;
}

void actor_disrupt(cell_rt *crt)
{
  crt->disrupt = 1;
  if (crt->state != ACTOR_RUNNING)
    actor_free(crt);
}

JSValue js_os_use(JSContext *js);
JSValue js_math_use(JSContext *js);

void script_startup(cell_rt *prt)
{
  JSRuntime *rt;

  rt = JS_NewRuntime();

  JSContext *js = JS_NewContextRaw(rt);
  JS_SetInterruptHandler(rt, actor_interrupt_cb, prt);
  
  JS_AddIntrinsicBaseObjects(js);
  JS_AddIntrinsicEval(js);
  JS_AddIntrinsicRegExp(js);
  JS_AddIntrinsicJSON(js);
  JS_AddIntrinsicMapSet(js);

  JS_SetContextOpaque(js, prt);
  prt->context = js;

  cell_rt *crt = JS_GetContextOpaque(js);
  JS_FreeValue(js, js_blob_use(js));

  JSValue globalThis = JS_GetGlobalObject(js);

  JSValue cell = JS_NewObject(js);
  JS_SetPropertyStr(js,globalThis,"cell", cell);

  JSValue hidden_fn = JS_NewObject(js);

  JS_SetPropertyStr(js, cell, "hidden", hidden_fn);
  JS_SetPropertyStr(js, hidden_fn, "os", js_os_use(js));

  const char actorsym_script[] = "Symbol('actordata');";
  
  JSValue actorsym = JS_Eval(js, actorsym_script, sizeof(actorsym_script)-1, "internal", 0);
  JS_SetPropertyStr(js, hidden_fn, "actorsym", actorsym);
  
  crt->actor_sym = JS_ValueToAtom(js, actorsym);
  
  if (crt->init_wota) {
    JS_SetPropertyStr(js, hidden_fn, "init", wota2value(js, crt->init_wota));
    // init wota can now be freed
    free(crt->init_wota);
    crt->init_wota = NULL;
  }

  // Store the core path for scripts to use
  JSValue js_cell = JS_GetPropertyStr(js, globalThis, "cell");
  JSValue hidden = JS_GetPropertyStr(js, js_cell, "hidden");
  if (core_path) {
    JS_SetPropertyStr(js, hidden, "core_path", JS_NewString(js, core_path));
  }
  JS_FreeValue(js, hidden);
  JS_FreeValue(js, js_cell);

  JS_FreeValue(js, globalThis);

  // Load engine.cm from the core directory
  size_t engine_size;
  char *data = load_core_file(ENGINE, &engine_size);
  if (!data) {
    printf("ERROR: Could not load %s from %s!\n", ENGINE, core_path);
    return;
  }

  crt->state = ACTOR_RUNNING;
  JSValue v = JS_Eval(js, data, engine_size, ENGINE, 0);
  free(data);
  uncaught_exception(js, v);
  crt->state = ACTOR_IDLE;
  set_actor_state(crt);
}

static void signal_handler(int sig)
{
  const char *str = NULL;
#ifndef TARGET_PLAYDATE
  switch (sig) {
    case SIGABRT: str = "SIGABRT"; break;
    case SIGFPE:  str = "SIGFPE";  break;
    case SIGILL:  str = "SIGILL";  break;
    case SIGINT:  str = "SIGINT";  break;
    case SIGSEGV: str = "SIGSEGV"; break;
    case SIGTERM: str = "SIGTERM"; break;
  }
#endif
  if (!str) return;
  
  exit_handler();
}

int cell_init(int argc, char **argv)
{
  int script_start = 1;

  /* Find the cell shop at ~/.cell */
  int found = find_cell_shop();
  if (!found) {
    return 1;
  }

  /* Create the initial actor from the command line */
  int actor_argc = argc - script_start;
  char **actor_argv = argv + script_start;

  WotaBuffer startwota;
  wota_buffer_init(&startwota, 5);
  wota_write_record(&startwota, 2);
  wota_write_text(&startwota, "program");
  wota_write_text(&startwota, actor_argv[0]);
  wota_write_text(&startwota, "arg");
  wota_write_array(&startwota, actor_argc - 1);
  for (int i = 1; i < actor_argc; i++)
    wota_write_text(&startwota, actor_argv[i]);
    
  /* Initialize synchronization primitives */
  actor_initialize();
    
  root_cell = create_actor(startwota.data);
#ifndef TARGET_PLAYDATE
  signal(SIGINT, signal_handler);
  signal(SIGTERM, signal_handler);
  signal(SIGSEGV, signal_handler);
  signal(SIGABRT, signal_handler);
#endif  
  actor_loop();

  return 0;
}

int JS_ArrayLength(JSContext *js, JSValue a)
{
  JSValue length = JS_GetPropertyStr(js, a, "length");
  int len;
  JS_ToInt32(js,&len,length);
  JS_FreeValue(js,length);
  return len;
}

int js2bool(JSContext *js, JSValue v) { return JS_ToBool(js,v); }
JSValue bool2js(JSContext *js, int b) { return JS_NewBool(js,b); }

JSValue number2js(JSContext *js, double g) { return JS_NewFloat64(js,g); }
double js2number(JSContext *js, JSValue v) {
  double g;
  JS_ToFloat64(js, &g, v);
  if (isnan(g)) g = 0;
  return g;
}

uint64_t cell_random_fit() {
  uint64_t buf;
  randombytes((uint8_t *)&buf, sizeof(buf));
  return buf >> 11;
}

double cell_random() {
  uint64_t buf = cell_random_fit();
  return (double)buf / 9007199254740992.0;
}

void cell_trace_sethook(cell_hook)
{
  
}

int uncaught_exception(JSContext *js, JSValue v)
{
  cell_rt *rt = JS_GetContextOpaque(js);
  
  if (!JS_HasException(js)) {
    JS_FreeValue(js,v);
    return 1;
  }

  JSValue exp = JS_GetException(js);
  
  if (JS_IsNull(rt->on_exception)) {
    const char *str = JS_ToCString(js, exp);
    if (str) {
      printf("Uncaught exception: %s\n", str);
      JS_FreeCString(js, str);
    }
    
    JSValue stack = JS_GetPropertyStr(js, exp, "stack");
    if (!JS_IsNull(stack)) {
      const char *stack_str = JS_ToCString(js, stack);
      if (stack_str) {
        printf("Stack trace:\n%s\n", stack_str);
        JS_FreeCString(js, stack_str);
      }
    }
    JS_FreeValue(js, stack);
  } else {
    JSValue ret = JS_Call(js, rt->on_exception, JS_NULL, 1, &exp);
    JS_FreeValue(js, ret);
  }
  
  JS_FreeValue(js, exp);
  JS_FreeValue(js, v);
  return 0;
}