import fs from "fs-extra"
import { app } from "electron"
import path from "path"
import { cloneDeep } from "lodash"
import Config from "config"
import type { IDefaultConfig } from "config"
import _debug from "debug"

const debug = _debug("app:setting")

type IConfig = IDefaultConfig

type IOnFunc = (n: IConfig, c: IConfig, keys?: (keyof IConfig)[]) => void
type IT = (keyof IConfig)[] | keyof IConfig | "_"

let storagePath = path.join(app.getPath("documents"), Config.app_title)
const storagePathDev = path.join(app.getPath("documents"), Config.app_title + "-dev")

if (process.env.NODE_ENV === "development") {
  storagePath = storagePathDev
}

const _tempConfig = cloneDeep(Config.default_config as IConfig)
Object.keys(_tempConfig).forEach(key => {
  if (typeof _tempConfig[key] === "string" && _tempConfig[key].includes("$storagePath$")) {
    _tempConfig[key] = _tempConfig[key].replace(/\$storagePath\$/g, storagePath)
    if (_tempConfig[key] && path.isAbsolute(_tempConfig[key])) {
      _tempConfig[key] = path.normalize(_tempConfig[key])
    }
  }
})

function isPath(str) {
  // 使用正则表达式检查字符串是否以斜杠或盘符开头
  return /^(?:\/|[a-zA-Z]:\\)/.test(str)
}

function init(config: IConfig) {
  // 在配置初始化后执行
  Object.keys(config).forEach(key => {
    if (config[key] && isPath(config[key]) && path.isAbsolute(config[key])) {
      fs.ensureDirSync(config[key])
    }
  })
  // 在配置初始化后执行
  // fs.ensureDirSync(config["snippet.storagePath"])
  // fs.ensureDirSync(config["bookmark.storagePath"])
}

// 判断是否是空文件夹
function isEmptyDir(fPath: string) {
  const pa = fs.readdirSync(fPath)
  if (pa.length === 0) {
    return true
  } else {
    return false
  }
}

class SettingClass {
  constructor() {
    debug(`Setting inited`)
    this.init()
  }

  #cb: [IT, IOnFunc][] = []

  onChange(fn: IOnFunc, that?: any)
  onChange(key: IT, fn: IOnFunc, that?: any)
  onChange(fnOrType: IT | IOnFunc, fnOrThat: IOnFunc | any = null, that: any = null) {
    if (typeof fnOrType === "function") {
      this.#cb.push(["_", fnOrType.bind(fnOrThat)])
    } else {
      this.#cb.push([fnOrType, fnOrThat.bind(that)])
    }
  }

  #runCB(n: IConfig, c: IConfig, keys: (keyof IConfig)[]) {
    for (let i = 0; i < this.#cb.length; i++) {
      const temp = this.#cb[i]
      const k = temp[0]
      const fn = temp[1]
      if (k === "_") {
        fn(n, c, keys)
      }
      if (typeof k === "string" && keys.includes(k as keyof IConfig)) {
        fn(n, c)
      }
      if (Array.isArray(k) && k.filter(v => keys.indexOf(v) !== -1).length) {
        fn(n, c)
      }
    }
  }

  #pathFile: string =
    process.env.NODE_ENV === "development"
      ? path.resolve(app.getPath("userData"), "./config_path-dev")
      : path.resolve(app.getPath("userData"), "./config_path")
  #config: IConfig = cloneDeep(_tempConfig)
  #configPath(storagePath?: string): string {
    return path.join(storagePath || this.#config.storagePath, "./config.json")
  }
  /**
   * 读取配置文件变量同步
   * @param confingPath 配置文件路径
   */
  #syncVar(confingPath?: string) {
    const configFile = this.#configPath(confingPath)
    if (!fs.pathExistsSync(configFile)) {
      fs.ensureFileSync(configFile)
      fs.writeJSONSync(configFile, {})
    }
    const config = fs.readJSONSync(configFile) as IConfig
    confingPath && (config.storagePath = confingPath)
    // 优先取本地的值
    for (const key in config) {
      // if (Object.prototype.hasOwnProperty.call(this.#config, key)) {
      //     this.#config[key] = config[key] || this.#config[key]
      // }
      // 删除配置时本地的配置不会改变，想一下哪种方式更好
      this.#config[key] = config[key] ?? this.#config[key]
    }
  }
  init() {
    debug(`位置：${this.#pathFile}`)

    if (fs.pathExistsSync(this.#pathFile)) {
      const confingPath = fs.readFileSync(this.#pathFile, { encoding: "utf8" })
      if (confingPath && fs.pathExistsSync(this.#configPath(confingPath))) {
        this.#syncVar(confingPath)
        // 防止增加了配置本地却没变的情况
        this.#sync(confingPath)
      } else {
        this.#syncVar(confingPath)
        this.#sync(confingPath)
      }
    } else {
      this.#syncVar()
      this.#sync()
    }
    init.call(this, this.#config)
  }
  config() {
    return this.#config
  }
  #sync(c?: string) {
    const config = cloneDeep(this.#config)
    delete config.storagePath
    const p = this.#configPath(c)
    fs.ensureFileSync(p)
    fs.writeJSONSync(this.#configPath(c), config)
  }
  #change(p: string) {
    const storagePath = this.#config.storagePath
    if (fs.existsSync(storagePath) && !fs.existsSync(p)) {
      fs.moveSync(storagePath, p)
    }
    if (fs.existsSync(p) && fs.existsSync(storagePath) && isEmptyDir(p)) {
      fs.moveSync(storagePath, p, { overwrite: true })
    }
    fs.writeFileSync(this.#pathFile, p, { encoding: "utf8" })
  }
  reset(key: keyof IConfig) {
    this.set(key, cloneDeep(_tempConfig[key]))
  }
  set(key: keyof IConfig | Partial<IConfig>, value?: any) {
    const oldMainConfig = Object.assign({}, this.#config)
    let isChange = false
    const changeKeys: (keyof IConfig)[] = []
    const canChangeStorage = (targetPath: string) => {
      if (fs.existsSync(oldMainConfig.storagePath) && fs.existsSync(targetPath) && !isEmptyDir(targetPath)) {
        if (fs.existsSync(path.join(targetPath, "./config.json"))) {
          return true
        }
        return false
      }
      return true
    }
    if (typeof key === "string") {
      if (value != undefined && value !== this.#config[key]) {
        if (key === "storagePath") {
          if (!canChangeStorage(value)) {
            throw "无法改变存储地址"
            return
          }
          this.#change(value)
          changeKeys.push("storagePath")
          this.#config["storagePath"] = value
        } else {
          changeKeys.push(key)
          this.#config[key as string] = value
        }
        isChange = true
      }
    } else {
      if (key["storagePath"] !== undefined && key["storagePath"] !== this.#config["storagePath"]) {
        if (!canChangeStorage(key["storagePath"])) {
          throw "无法改变存储地址"
          return
        }
        this.#change(key["storagePath"])
        this.#config["storagePath"] = key["storagePath"]
        changeKeys.push("storagePath")
        isChange = true
      }
      for (const _ in key) {
        if (Object.prototype.hasOwnProperty.call(key, _)) {
          const v = key[_]
          if (v != undefined && _ !== "storagePath" && v !== this.#config[_]) {
            this.#config[_] = v
            changeKeys.push(_ as keyof IConfig)
            isChange = true
          }
        }
      }
    }
    if (isChange) {
      this.#sync()
      this.#runCB(this.#config, oldMainConfig, changeKeys)
    }
  }
  values<T extends keyof IConfig>(key: T): IConfig[T] {
    return this.#config[key]
  }
}

const Setting = new SettingClass()

export default Setting
export { Setting }