import lodash from "lodash";
import fs from "fs";
import { pipeline } from 'stream'
import { promisify } from 'util'
import fetch from 'node-fetch'
import path from 'node:path'
const _path = process.cwd()

let Data = {

	/*
	 * 根据指定的path依次检查与创建目录
	 * */
	createDir(rootPath = "", path = "", includeFile = false) {
		let pathList = path.split("/"),
			nowPath = rootPath;
		pathList.forEach((name, idx) => {
			name = name.trim();
			if (!includeFile && idx <= pathList.length - 1) {
				nowPath += name + "/";
				if (name) {
					if (!fs.existsSync(nowPath)) {
						fs.mkdirSync(nowPath);
					}
				}
			}
		})
	},
	
	/*
	 * 读取json
	 * */
	readJSON(root, path) {
		if (!/\.json$/.test(path)) {
			path = path + ".json";
		}
		// 检查并创建目录
		Data.createDir(root, path, true);
		if (fs.existsSync(`${root}/${path}`)) {
			let jsonRet = fs.readFileSync(`${root}/${path}`, "utf8");
			return JSON.parse(jsonRet);
		}
		return {}
	},
	mkdirs (dirname) {
	  if (fs.existsSync(dirname)) {
	    return true
	  } else {
	    if (Data.mkdirs(path.dirname(dirname))) {
	      fs.mkdirSync(dirname)
	      return true
	    }
	  }
	},
	/**
	 * 下载保存文件
	 * @param fileUrl 下载地址
	 * @param savePath 保存路径
	 */
	async downFile(fileUrl, savePath, param = {}) {
		try {
			Data.mkdirs(path.dirname(savePath))
			Bot.logger.mark(`[下载文件] ${fileUrl}`)
			const response = await fetch(fileUrl, param)
			const streamPipeline = promisify(pipeline)
			await streamPipeline(response.body, fs.createWriteStream(savePath))
			return true
		} catch (err) {
			Bot.logger.error(`下载文件错误：${err}`)
			return false
		}
	},
	/*
	 * 写JSON
	 * */
	writeJson(root, path, file, data, space = "\t") {
		if (!/\.json$/.test(file)) {
			file = file + ".json";
		}

		// 检查并创建目录
		Data.createDir(path, true);
		return fs.writeFileSync(`${path}/${file}`, JSON.stringify(data, null, space));
	},
	async importModule(path, file, rootPath = _path) {
		if (!/\.js$/.test(file)) {
			file = file + '.js'
		}
		// 检查并创建目录
		Data.createDir(_path, path, true)
		if (fs.existsSync(`${_path}/${path}/${file}`)) {
			let data = await import(`file://${_path}/${path}/${file}`)
			return data || {}
		}
		return {}
	},
	/*
	 * 返回一个从 target 中选中的属性的对象
	 *
	 * keyList : 获取字段列表，逗号分割字符串
	 *   key1, key2, toKey1:fromKey1, toKey2:fromObj.key
	 *
	 * defaultData: 当某个字段为空时会选取defaultData的对应内容
	 * toKeyPrefix：返回数据的字段前缀，默认为空。defaultData中的键值无需包含toKeyPrefix
	 *
	 * */

	getData(target, keyList = "", cfg = {}) {
		target = target || {};
		let defaultData = cfg.defaultData || {};
		let ret = {};
		// 分割逗号
		if (typeof(keyList) === "string") {
			keyList = keyList.split(",");
		}

		lodash.forEach(keyList, (keyCfg) => {
			// 处理通过:指定 toKey & fromKey
			let _keyCfg = keyCfg.split(":");
			let keyTo = _keyCfg[0].trim(),
				keyFrom = (_keyCfg[1] || _keyCfg[0]).trim(),
				keyRet = keyTo;
			if (cfg.lowerFirstKey) {
				keyRet = lodash.lowerFirst(keyRet);
			}
			if (cfg.keyPrefix) {
				keyRet = cfg.keyPrefix + keyRet;
			}
			// 通过Data.getVal获取数据
			ret[keyRet] = Data.getVal(target, keyFrom, defaultData[keyTo], cfg);
		})
		return ret;
	},

	getVal(target, keyFrom, defaultValue) {
		return lodash.get(target, keyFrom, defaultValue);
	},

	getUrlPath(url) {
		let reg = /^https*:\/\/(.*)\/(\w+\.(png|jpg|jpeg|webp))(\?.*)?$/;
		let ret = reg.exec(url);
		if (!ret) {
			return false;
		}
		return {
			path: ret[1],
			filename: ret[2],
			type: ret[3],
			url
		}
	},
	pathExists(root, path) {
		if (fs.existsSync(root + "/" + path)) {
			return true;
		}
		path = path.replace("\\", "/");
		const dirList = path.split("/");
		let currentDir = root;

		for (let dir of dirList) {
			currentDir = currentDir + "/" + dir;
			if (!fs.existsSync(currentDir)) {
				fs.mkdirSync(currentDir);
			}
		}
		return true;
	},
	async asyncPool(poolLimit, array, iteratorFn) {
		const ret = []; // 存储所有的异步任务
		const executing = []; // 存储正在执行的异步任务
		for (const item of array) {
			// 调用iteratorFn函数创建异步任务
			const p = Promise.resolve().then(() => iteratorFn(item, array));
			// 保存新的异步任务
			ret.push(p);

			// 当poolLimit值小于或等于总任务个数时，进行并发控制
			if (poolLimit <= array.length) {
				// 当任务完成后，从正在执行的任务数组中移除已完成的任务
				const e = p.then(() => executing.splice(executing.indexOf(e), 1));
				executing.push(e); // 保存正在执行的异步任务
				if (executing.length >= poolLimit) {
					// 等待较快的任务执行完成
					await Promise.race(executing);
				}
			}
		}
		return Promise.all(ret);
	},

	sleep(ms) {
		return new Promise((resolve) => setTimeout(resolve, ms));
	}


}

export default Data;