#include "resources.h"

#include "config.h"
#include "log.h"
#include <dirent.h>
#include <stdarg.h>
#include <stddef.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <unistd.h>
#include "font.h"

#include <fcntl.h>
#include "cdb.h"

#ifndef __EMSCRIPTEN__
#include <ftw.h>
#endif

#define SOKOL_FETCH_IMPL
#include "sokol/sokol_fetch.h"

#include "stb_ds.h"

#include "core.cdb.h"

#if defined(_WIN32)
#include <direct.h>
#define mkdir(x,y) _mkdir(x)
#endif

char **prefabs;

static const char *cur_ext = NULL;
struct dirent *c_dirent = NULL;

char pathbuf[MAXPATH + 1];

static struct cdb corecdb;
static struct cdb game_cdb;

int LOADED_GAME = 0;
uint8_t *gamebuf;

static void response_cb(const sfetch_response_t *r)
{
  if (r->fetched) {
    cdb_initf(&game_cdb, r->data.ptr, r->data.size);
    LOADED_GAME = 1;
  }
  if (r->finished) {
    LOADED_GAME = -1;
    if (r->failed) {
      LOADED_GAME = -1;
    }
  }
}

void resources_init() {
  sfetch_setup(&(sfetch_desc_t){
    .max_requests = 1024,
    .num_channels = 4,
    .num_lanes = 8,
    .logger = { .func = sg_logging },
  });
  gamebuf = malloc(64*1024*1024);

  sfetch_handle_t h = sfetch_send(&(sfetch_request_t){
    .path="game.cdb",
    .callback = response_cb,
    .buffer = {
      .ptr = gamebuf,
      .size = 64*1024*1024
    }
  });

  cdb_initf(&corecdb, core_cdb, core_cdb_len);
}

char *get_filename_from_path(char *path, int extension) {
  char *dirpos = strrchr(path, '/');
  if (!dirpos)
    dirpos = path;

  char *end = strrchr(path, '\0');

  int offset = 0;
  if (!extension) {
    char *ext = strrchr(path, '.');
    offset = end - ext;
    YughInfo("Making %s without extension ...");
  }

  char *filename = malloc(sizeof(char) * (end - dirpos - offset + 1));
  strncpy(filename, dirpos, end - dirpos - offset);
  return filename;
}

char *dirname(const char *path)
{
  const char *dirpos = strrchr(path, '/');
  if (!dirpos) return ".";
  char *dir = malloc(dirpos-path+1);
  strncpy(dir,path,dirpos-path);
  return dir;
}

char *seprint(char *fmt, ...)
{
  va_list args;
  va_start (args, fmt);
  char test[128];
  int len = vsnprintf(test, 128, fmt, args);
  if (len > 128) {
    char *test = malloc(len+1);
    vsnprintf(test, len+1, fmt, args);
    return strdup(test);
  }
  
  return strdup(test);
}

static char *ext_paths = NULL;

#ifndef __EMSCRIPTEN__
static char **ls_paths = NULL;

static int ls_ftw(const char *path, const struct stat *sb, int typeflag)
{
  if (typeflag == FTW_F && strlen(path) > 2)
    arrpush(ls_paths, strdup(&path[2]));

  return 0;
}

// TODO: Not reentrant
char **ls(const char *path)
{
  if (ls_paths) {
    for (int i = 0; i < arrlen(ls_paths); i++)
      free(ls_paths[i]);

    arrfree(ls_paths);
  }
  
  ftw(path, ls_ftw, 10);
  return ls_paths;
}

#else
void fill_extensions(char *paths, const char *path, const char *ext)
{};
#endif

char *str_replace_ext(const char *s, const char *newext) {
  static char ret[256];

  strncpy(ret, s, 256);
  char *ext = strrchr(ret, '.');
  strncpy(ext, newext, 10);

  return ret;
}

FILE *path_open(const char *tag, const char *fmt, ...) {
  va_list args;
  va_start(args, fmt);
  vsnprintf(pathbuf, MAXPATH+1, fmt, args);
  va_end(args);

  FILE *f = fopen(pathbuf, tag);
  return f;
}

void *cdb_slurp(struct cdb *cdb, const char *file, size_t *size)
{
    unsigned vlen, vpos;
    vpos = cdb_datapos(cdb);
    vlen = cdb_datalen(cdb);
    char *data = malloc(vlen+1);
    cdb_read(cdb, data, vlen, vpos);
    if (size) *size = vlen;
    return data;
}

int fexists(const char *path)
{
  int len = strlen(path);
  if (cdb_find(&game_cdb, path, len)) return 1;
  else if (cdb_find(&corecdb, path, len)) return 1;
  else if (!access(path, R_OK)) return 1;

  return 0;
}

void *os_slurp(const char *file, size_t *size)
{
  FILE *f;

  jump:
  f = fopen(file, "rb");

  if (!f) return NULL;

  fseek(f, 0, SEEK_END);
  size_t fsize = ftell(f);
  rewind(f);
  void *slurp = malloc(fsize);
  fread(slurp, fsize, 1, f);
  fclose(f);

  if (size) *size = fsize;

  return slurp;
}

void *slurp_file(const char *filename, size_t *size)
{
  if (!access(filename, R_OK))
    return os_slurp(filename, size);
  else if (cdb_find(&game_cdb, filename, strlen(filename)))
    return cdb_slurp(&game_cdb, filename, size);
  else if (cdb_find(&corecdb, filename, strlen(filename)))
    return cdb_slurp(&corecdb, filename, size);

  return NULL;
}

char *slurp_text(const char *filename, size_t *size)
{
  size_t len;
  unsigned char *str = slurp_file(filename, &len);
  if (!str) return NULL;
  char *retstr = malloc(len+1);
  memcpy(retstr, str, len);
  retstr[len] = '\0';
  free(str);
  if (size) *size = len;
  return retstr;
}

int cp(const char *p1, const char *p2)
{
  size_t len;
  void *data = slurp_file(p1, &len);

  FILE *f = fopen(p2, "w");
  if (!f) return 1;
  fwrite(data, len, 1, f);
  free(data);
  fclose(f);
  return 0;
}

int mkpath(char *path, mode_t mode)
{
    char tmp[256];
    char *p = NULL;
    size_t len;
    struct stat sb;

    strncpy(tmp, path, sizeof(tmp));
    len = strlen(tmp);
    if (len > 0 && tmp[len - 1] == '/')
        tmp[len - 1] = 0;

    for (p = tmp + 1; *p; p++) {
        if (*p == '/') {
            *p = 0;
            if (stat(tmp, &sb) != 0) {
                if (errno != ENOENT || mkdir(tmp, mode) != 0) {
                    return -1;
                }
            } else if (!S_ISDIR(sb.st_mode)) {
                errno = ENOTDIR;
                return -1;
            }
            *p = '/';
        }
    }

    if (stat(tmp, &sb) != 0) {
        if (errno != ENOENT || mkdir(tmp, mode) != 0) {
            return -1;
        }
    } else if (!S_ISDIR(sb.st_mode)) {
        errno = ENOTDIR;
        return -1;
    }

    return 0;
}

int slurp_write(const char *txt, const char *filename, size_t len) {
  FILE *f = fopen(filename, "w");
  if (!f) return 1;

  if (len < 0) len = strlen(txt);
  fwrite(txt, len, 1, f);
  fclose(f);
  return 0;
}

#ifndef __EMSCRIPTEN__
static struct cdb_make cdbm;

static const char *pack_ext[] = {".qoi", ".qoa", ".js", ".wav", ".mp3", ".png", ".sf2", ".midi", ".lvl", ".glsl", ".ttf", ".json", ".jso"};

static int ftw_pack(const char *path, const struct stat *sb, int flag)
{
  if (flag != FTW_F) return 0;
  int pack = 0;
  char *ext = strrchr(path, '.');

  if (!ext)
    return 0;

  for (int i = 0; i < 13; i++) {
    if (!strcmp(ext, pack_ext[i])) {
      pack = 1;
      break;
    }
  }

  if (!pack) return 0;

  size_t len;
  void *file = slurp_file(path, &len);
  cdb_make_add(&cdbm, &path[2], strlen(&path[2]), file, len);
    
  free(file);

  return 0;
}

void pack_engine(const char *fname)
{
  int fd;
  char *key, *va;
  unsigned klen, vlen;
  fd = creat(fname, O_RDWR);
  if (fd == -1) {
    YughError("Couldn't make file at %s.", fname);
    return;
  }
  cdb_make_start(&cdbm, fd);
  ftw(".", ftw_pack, 20);
  cdb_make_finish(&cdbm);
  close(fd);
}
#else
void pack_engine(const char *fname){
  YughError("Cannot pack engine on a web build.");
}

char **ls(const char *path) { return NULL; }
#endif