import {
  appConfigPath,
  controledMihomoConfigPath,
  dataDir,
  logDir,
  mihomoTestDir,
  mihomoWorkDir,
  overrideConfigPath,
  overrideDir,
  profileConfigPath,
  profilePath,
  profilesDir,
  resourcesFilesDir,
  subStoreDir,
  themesDir
} from './dirs'
import {
  defaultConfig,
  defaultControledMihomoConfig,
  defaultOverrideConfig,
  defaultProfile,
  defaultProfileConfig
} from './template'
import yaml from 'yaml'
import { mkdir, writeFile, copyFile, rm, readdir } from 'fs/promises'
import { existsSync } from 'fs'
import path from 'path'
import { startPacServer, startSubStoreServer } from '../resolve/server'
import { triggerSysProxy } from '../sys/sysproxy'
import {
  getAppConfig,
  getControledMihomoConfig,
  patchAppConfig,
  patchControledMihomoConfig
} from '../config'
import { app } from 'electron'

async function initDirs(): Promise<void> {
  if (!existsSync(dataDir())) {
    await mkdir(dataDir())
  }
  if (!existsSync(themesDir())) {
    await mkdir(themesDir())
  }
  if (!existsSync(profilesDir())) {
    await mkdir(profilesDir())
  }
  if (!existsSync(overrideDir())) {
    await mkdir(overrideDir())
  }
  if (!existsSync(mihomoWorkDir())) {
    await mkdir(mihomoWorkDir())
  }
  if (!existsSync(logDir())) {
    await mkdir(logDir())
  }
  if (!existsSync(mihomoTestDir())) {
    await mkdir(mihomoTestDir())
  }
  if (!existsSync(subStoreDir())) {
    await mkdir(subStoreDir())
  }
}

async function initConfig(): Promise<void> {
  if (!existsSync(appConfigPath())) {
    await writeFile(appConfigPath(), yaml.stringify(defaultConfig))
  }
  if (!existsSync(profileConfigPath())) {
    await writeFile(profileConfigPath(), yaml.stringify(defaultProfileConfig))
  }
  if (!existsSync(overrideConfigPath())) {
    await writeFile(overrideConfigPath(), yaml.stringify(defaultOverrideConfig))
  }
  if (!existsSync(profilePath('default'))) {
    await writeFile(profilePath('default'), yaml.stringify(defaultProfile))
  }
  if (!existsSync(controledMihomoConfigPath())) {
    await writeFile(controledMihomoConfigPath(), yaml.stringify(defaultControledMihomoConfig))
  }
}

async function initFiles(): Promise<void> {
  const copy = async (file: string): Promise<void> => {
    const targetPath = path.join(mihomoWorkDir(), file)
    const testTargrtPath = path.join(mihomoTestDir(), file)
    const sourcePath = path.join(resourcesFilesDir(), file)
    if (!existsSync(targetPath) && existsSync(sourcePath)) {
      await copyFile(sourcePath, targetPath)
    }
    if (!existsSync(testTargrtPath) && existsSync(sourcePath)) {
      await copyFile(sourcePath, testTargrtPath)
    }
  }
  await Promise.all([
    copy('country.mmdb'),
    copy('geoip.dat'),
    copy('geosite.dat'),
    copy('ASN.mmdb')
  ])
}

async function cleanup(): Promise<void> {
  // update cache
  const files = await readdir(dataDir())
  for (const file of files) {
    if (file.endsWith('.exe') || file.endsWith('.dmg') || file.endsWith('.zip')) {
      try {
        await rm(path.join(dataDir(), file))
      } catch {
        // ignore
      }
    }
  }
  // logs
  const { maxLogDays = 7 } = await getAppConfig()
  const logs = await readdir(logDir())
  for (const log of logs) {
    const date = new Date(log.split('.')[0])
    const diff = Date.now() - date.getTime()
    if (diff > maxLogDays * 24 * 60 * 60 * 1000) {
      try {
        await rm(path.join(logDir(), log))
      } catch {
        // ignore
      }
    }
  }
}

async function migration(): Promise<void> {
  const {
    siderOrder = [
      'sysproxy',
      'tun',
      'profile',
      'proxy',
      'rule',
      'resource',
      'override',
      'connection',
      'mihomo',
      'dns',
      'sniff',
      'log',
      'substore'
    ],
    appTheme = 'system',
    useSubStore = true
  } = await getAppConfig()
  const {
    'skip-auth-prefixes': skipAuthPrefixes,
    authentication,
    'bind-address': bindAddress,
    'lan-allowed-ips': lanAllowedIps,
    'lan-disallowed-ips': lanDisallowedIps
  } = await getControledMihomoConfig()
  // add substore sider card
  if (useSubStore && !siderOrder.includes('substore')) {
    await patchAppConfig({ siderOrder: [...siderOrder, 'substore'] })
  }
  // add default skip auth prefix
  if (!skipAuthPrefixes) {
    await patchControledMihomoConfig({ 'skip-auth-prefixes': ['127.0.0.1/32'] })
  }
  // add default authentication
  if (!authentication) {
    await patchControledMihomoConfig({ authentication: [] })
  }
  // add default bind address
  if (!bindAddress) {
    await patchControledMihomoConfig({ 'bind-address': '*' })
  }
  // add default lan allowed ips
  if (!lanAllowedIps) {
    await patchControledMihomoConfig({ 'lan-allowed-ips': ['0.0.0.0/0', '::/0'] })
  }
  // add default lan disallowed ips
  if (!lanDisallowedIps) {
    await patchControledMihomoConfig({ 'lan-disallowed-ips': [] })
  }
  // remove custom app theme
  if (!['system', 'light', 'dark'].includes(appTheme)) {
    await patchAppConfig({ appTheme: 'system' })
  }
}

function initDeeplink(): void {
  if (process.defaultApp) {
    if (process.argv.length >= 2) {
      app.setAsDefaultProtocolClient('clash', process.execPath, [path.resolve(process.argv[1])])
      app.setAsDefaultProtocolClient('mihomo', process.execPath, [path.resolve(process.argv[1])])
    }
  } else {
    app.setAsDefaultProtocolClient('clash')
    app.setAsDefaultProtocolClient('mihomo')
  }
}

export async function init(): Promise<void> {
  await initDirs()
  await initConfig()
  await migration()
  await initFiles()
  await cleanup()
  await startPacServer()
  await startSubStoreServer()
  const { sysProxy } = await getAppConfig()
  await triggerSysProxy(sysProxy.enable)

  initDeeplink()
}