const fs = require('fs-extra')
const path = require('path')

const execa = require('execa')
const minimist = require('minimist')
const semver = require('semver')
const LRU = require('lru-cache')

const {
  hasYarn,
  hasProjectYarn,
  hasPnpm3OrLater,
  hasProjectPnpm
} = require('@vue/cli-shared-utils/lib/env')
const { isOfficialPlugin, resolvePluginId } = require('@vue/cli-shared-utils/lib/pluginResolution')

const { loadOptions } = require('../options')
const getPackageJson = require('./getPackageJson')
const { executeCommand } = require('./executeCommand')

const registries = require('./registries')
const shouldUseTaobao = require('./shouldUseTaobao')

const metadataCache = new LRU({
  max: 200,
  maxAge: 1000 * 60 * 30 // 30 min.
})

const isTestOrDebug = process.env.VUE_CLI_TEST || process.env.VUE_CLI_DEBUG

const TAOBAO_DIST_URL = 'https://npm.taobao.org/dist'
const SUPPORTED_PACKAGE_MANAGERS = ['yarn', 'pnpm', 'npm']
const PACKAGE_MANAGER_CONFIG = {
  npm: {
    install: ['install', '--loglevel', 'error'],
    add: ['install', '--loglevel', 'error'],
    upgrade: ['update', '--loglevel', 'error'],
    remove: ['uninstall', '--loglevel', 'error']
  },
  pnpm: {
    install: ['install', '--loglevel', 'error', '--shamefully-flatten'],
    add: ['install', '--loglevel', 'error', '--shamefully-flatten'],
    upgrade: ['update', '--loglevel', 'error'],
    remove: ['uninstall', '--loglevel', 'error']
  },
  yarn: {
    install: [],
    add: ['add'],
    upgrade: ['upgrade'],
    remove: ['remove']
  }
}

// extract the package name 'xx' from the format 'xx@1.1'
function stripVersion (packageName) {
  const nameRegExp = /^(@?[^@]+)(@.*)?$/
  const result = packageName.match(nameRegExp)

  if (!result) {
    throw new Error(`Invalid package name ${packageName}`)
  }

  return result[1]
}

class PackageManager {
  constructor ({ context, forcePackageManager } = {}) {
    this.context = context

    if (forcePackageManager) {
      this.bin = forcePackageManager
    } else if (context) {
      this.bin = hasProjectYarn(context) ? 'yarn' : hasProjectPnpm(context) ? 'pnpm' : 'npm'
    } else {
      this.bin = loadOptions().packageManager || (hasYarn() ? 'yarn' : hasPnpm3OrLater() ? 'pnpm' : 'npm')
    }

    if (!SUPPORTED_PACKAGE_MANAGERS.includes(this.bin)) {
      throw new Error(`Unknown package manager: ${this.bin}`)
    }
  }

  // Any command that implemented registry-related feature should support
  // `-r` / `--registry` option
  async getRegistry () {
    if (this._registry) {
      return this._registry
    }

    const args = minimist(process.argv, {
      alias: {
        r: 'registry'
      }
    })

    if (args.registry) {
      this._registry = args.registry
    } else if (await shouldUseTaobao(this.bin)) {
      this._registry = registries.taobao
    } else {
      const { stdout } = await execa(this.bin, ['config', 'get', 'registry'])
      this._registry = stdout
    }

    return this._registry
  }

  async addRegistryToArgs (args) {
    const registry = await this.getRegistry()
    args.push(`--registry=${registry}`)

    if (registry === registries.taobao) {
      args.push(`--disturl=${TAOBAO_DIST_URL}`)
    }

    return args
  }

  async getMetadata (packageName, { field = '' } = {}) {
    const registry = await this.getRegistry()

    const metadataKey = `${this.bin}-${registry}-${packageName}`
    let metadata = metadataCache.get(metadataKey)

    if (metadata) {
      return metadata
    }

    const args = await this.addRegistryToArgs(['info', packageName, field, '--json'])
    const { stdout } = await execa(this.bin, args)

    metadata = JSON.parse(stdout)
    if (this.bin === 'yarn') {
      // `yarn info` outputs messages in the form of `{"type": "inspect", data: {}}`
      metadata = metadata.data
    }

    metadataCache.set(metadataKey, metadata)
    return metadata
  }

  async getRemoteVersion (packageName, versionRange = 'latest') {
    const metadata = await this.getMetadata(packageName)
    if (Object.keys(metadata['dist-tags']).includes(versionRange)) {
      return metadata['dist-tags'][versionRange]
    }
    const versions = Array.isArray(metadata.versions) ? metadata.versions : Object.keys(metadata.versions)
    return semver.maxSatisfying(versions, versionRange)
  }

  getInstalledVersion (packageName) {
    // for first level deps, read package.json directly is way faster than `npm list`
    try {
      const packageJson = getPackageJson(
        path.resolve(this.context, 'node_modules', packageName)
      )
      return packageJson.version
    } catch (e) {
      return 'N/A'
    }
  }

  async install () {
    const args = await this.addRegistryToArgs(PACKAGE_MANAGER_CONFIG[this.bin].install)
    return executeCommand(this.bin, args, this.context)
  }

  async add (packageName, isDev = true) {
    const args = await this.addRegistryToArgs([
      ...PACKAGE_MANAGER_CONFIG[this.bin].add,
      packageName,
      ...(isDev ? ['-D'] : [])
    ])
    return executeCommand(this.bin, args, this.context)
  }

  async upgrade (packageName) {
    const realname = stripVersion(packageName)
    if (
      isTestOrDebug &&
      (packageName === '@vue/cli-service' || isOfficialPlugin(resolvePluginId(realname)))
    ) {
      // link packages in current repo for test
      const src = path.resolve(__dirname, `../../../../${realname}`)
      const dest = path.join(this.context, 'node_modules', realname)
      await fs.remove(dest)
      await fs.symlink(src, dest, 'dir')
      return
    }

    const args = await this.addRegistryToArgs([
      ...PACKAGE_MANAGER_CONFIG[this.bin].add,
      packageName
    ])
    return executeCommand(this.bin, args, this.context)
  }

  async remove (packageName) {
    const args = [
      ...PACKAGE_MANAGER_CONFIG[this.bin].remove,
      packageName
    ]
    return executeCommand(this.bin, args, this.context)
  }
}

module.exports = PackageManager