#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 QOP_IMPLEMENTATION
#include "qop.h"

#define ENGINE "engine.cm"

static qop_desc qop_core;
static qop_file *qop_hashmap = NULL;
cell_rt *root_cell = NULL;

int get_executable_path(char *buffer, unsigned int buffer_size) {
#if defined(__linux__)
  ssize_t len = readlink("/proc/self/exe", buffer, buffer_size - 1);
  if (len == -1) {
    return 0;
  }
  buffer[len] = '\0';
  return len;
#elif defined(__APPLE__)
  if (_NSGetExecutablePath(buffer, &buffer_size) == 0) {
    return buffer_size;
  }
#elif defined(_WIN32)
  return GetModuleFileName(NULL, buffer, buffer_size);
#endif

  return 0;
}

int prosperon_mount_core(void)
{
  char exe_path[PATH_MAX];
  int exe_path_len = get_executable_path(exe_path, sizeof(exe_path));
  if (exe_path_len == 0) {
    printf("ERROR: Could not get executable path\n");
    return 0;
  }

  // Load the entire executable into memory
  FILE *fh = fopen(exe_path, "rb");
  if (!fh) {
    printf("ERROR: Could not open executable\n");
    return 0;
  }

  fseek(fh, 0, SEEK_END);
  long file_size = ftell(fh);
  fseek(fh, 0, SEEK_SET);

  unsigned char *buf = malloc(file_size);
  if (!buf) {
    printf("ERROR: Could not allocate memory for executable\n");
    fclose(fh);
    return 0;
  }

  if (fread(buf, 1, file_size, fh) != (size_t)file_size) {
    printf("ERROR: Could not read executable\n");
    free(buf);
    fclose(fh);
    return 0;
  }

  fclose(fh);

  // Open the QOP archive from the in-memory data
  int archive_size = qop_open_data(buf, file_size, &qop_core);
  if (archive_size == 0) {
    printf("ERROR: Could not open QOP archive\n");
    free(buf);
    return 0;
  }

  // Read the archive index
  qop_hashmap = malloc(qop_core.hashmap_size);
  if (!qop_hashmap) {
    printf("ERROR: Could not allocate memory for QOP hashmap\n");
    qop_close(&qop_core);
    free(buf);
    return 0;
  }

  int index_len = qop_read_index(&qop_core, qop_hashmap);
  if (index_len == 0) {
    printf("ERROR: Could not read QOP index\n");
    free(qop_hashmap);
    qop_hashmap = NULL;
    qop_close(&qop_core);
    free(buf);
    return 0;
  }

  return 1;
}

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

JSValue js_os_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[] = "var sym = Symbol(`actordata`); sym;";
  
  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;
  }

  JSValue js_cell = JS_GetPropertyStr(js, globalThis, "cell");
  JSValue hidden = JS_GetPropertyStr(js, js_cell, "hidden");
  size_t archive_size = qop_core.data_size - qop_core.files_offset;
  JSValue blob = js_new_blob_stoned_copy(js, qop_core.data + qop_core.files_offset, archive_size);
  JS_SetPropertyStr(js, hidden, "core_qop_blob", blob);
  JS_FreeValue(js, hidden);
  JS_FreeValue(js, js_cell);

  JS_FreeValue(js, globalThis);

  // Find and load engine.cm from QOP archive
  qop_file *engine_file = qop_find(&qop_core, ENGINE);
  if (!engine_file) {
    printf("ERROR: Could not find file %s in QOP archive!\n", ENGINE);
    return;
  }

  char *data = malloc(engine_file->size + 1);
  if (!data) {
    printf("ERROR: Could not allocate memory for %s!\n", ENGINE);
    return;
  }

  int bytes_read = qop_read(&qop_core, engine_file, (unsigned char *)data);
  if (bytes_read != (int)engine_file->size) {
    printf("ERROR: Could not read file %s from QOP archive!\n", ENGINE);
    free(data);
    return;
  }
  data[engine_file->size] = 0;

  crt->state = ACTOR_RUNNING;
  JSValue v = JS_Eval(js, data, (size_t)engine_file->size, ENGINE, 0);
  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;

  /* Load QOP package attached to executable - this is now mandatory! */
  int mounted = prosperon_mount_core();
  if (!mounted) {
    printf("ERROR: Could not load core QOP package.\n");
    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;
}

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);
  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;
}