// @ts-check
import fs from "node:fs";
import path from "node:path";
import findCacheDir from "find-cache-dir";
import filterConfigs from "./filterConfigs.js";
import { findUpSync } from "find-up"
import { get_var } from "@polymech/commons/config"
import { resolve } from "@polymech/commons"
import { sync as mkdir } from "@polymech/fs/dir"
import { sync as exists } from "@polymech/fs/exists"

import os from "node:os";

// Boost libuv threadpool size on Windows for better sharp performance
// See: https://sharp.pixelplumbing.com/performance/
if (os.platform() === "win32" && !process.env.UV_THREADPOOL_SIZE) {
  process.env.UV_THREADPOOL_SIZE = "8";
}

// Sharp related checks
export const sharp = await (async () => {
  try {
    if (await import("sharp")) {
      return true;
    }
  } catch (error) {
    return false;
  }
})();

export const supportedImageTypes = [
  "avif",
  "jpeg",
  "jpg",
  "png",
  "webp",
  ...(sharp ? ["heic", "heif", "tiff", "gif"] : ["jxl", "wp2"]),
];

// prettier-ignore
export const supportedConfigs = [
  "src", "alt", "tag", "content", "sizes", "preload", "loading", "decoding", "attributes",
  "layout", "placeholder", "breakpoints", "objectFit", "objectPosition", "backgroundSize",
  "backgroundPosition", "format", "fallbackFormat", "includeSourceFormat", "formatOptions",
  "fadeInTransition", "artDirectives", "flip", "flop", "invert", "flatten", "normalize",
  "grayscale", "hue", "saturation", "brightness", "w", "h", "ar", "width", "height", "aspect",
  "background", "tint", "blur", "median", "rotate", "quality", "fit", "kernel", "position",
  "cacheDir", "assetFileNames", "cacheRoot"
];

const configFile = findUpSync([
  "astro-imagetools.config.js",
  "astro-imagetools.config.mjs",
]);
/* @vite-ignore */
const configFunction = configFile ? await import(configFile).catch(async () => await import("/" + configFile)) : null;

const rawGlobalConfigOptions = configFunction?.default ?? {};

const NonGlobalConfigOptions = ["src", "alt", "content"];

const GlobalConfigs = supportedConfigs.filter(
  (key) => !NonGlobalConfigOptions.includes(key)
);

const GlobalConfigOptions = filterConfigs(
  "Global",
  rawGlobalConfigOptions,
  GlobalConfigs
);

export { GlobalConfigOptions };

// CWD
export const cwd = process.cwd().split(path.sep).join(path.posix.sep);

const { cacheDir } = GlobalConfigOptions;

// FS Cache related checks

let fsCachePath =
  (cacheDir
    ? cwd + cacheDir
    : findCacheDir({
      name: "astro-imagetools",
    })) + "/";

fs.existsSync(fsCachePath) || fs.mkdirSync(fsCachePath, { recursive: true });

const cache_dir = () => {
  if (!GlobalConfigOptions.cacheRoot) return false;
  let dir;
  if (!exists(GlobalConfigOptions.cacheRoot)) {
    dir = path.resolve(resolve(GlobalConfigOptions.cacheRoot, false, {
      "POLYMECH-CACHE": get_var("POLYMECH-CACHE")
    }))
    if (!exists(dir)) {
      mkdir(dir);
    }
  } else {
    dir = GlobalConfigOptions.cacheRoot
  }
  return dir + "/";
}
// @todo : cache dir
const pm_cache_dir = cache_dir();
fsCachePath = pm_cache_dir ? pm_cache_dir : fsCachePath;
export { fsCachePath };