const path = require('path')
const fs = require('fs/promises')
const { existsSync } = require('fs')
const exec = require('./util/exec')
const logger = require('./util/logger')
const runConfigs = require('./run')
const addComment = require('./add-comment')
const actionInfo = require('./prepare/action-info')()
const { mainRepoDir, diffRepoDir } = require('./constants')
const loadStatsConfig = require('./prepare/load-stats-config')
const { cloneRepo, mergeBranch, getCommitId, linkPackages, getLastStable } =
  require('./prepare/repo-setup')(actionInfo)

const allowedActions = new Set(['synchronize', 'opened'])

if (!allowedActions.has(actionInfo.actionName) && !actionInfo.isRelease) {
  logger(
    `Not running for ${actionInfo.actionName} event action on repo: ${actionInfo.prRepo} and ref ${actionInfo.prRef}`
  )
  process.exit(0)
}

;(async () => {
  try {
    if (existsSync(path.join(__dirname, '../SKIP_NEXT_STATS.txt'))) {
      console.log(
        'SKIP_NEXT_STATS.txt file present, exiting stats generation..'
      )
      process.exit(0)
    }

    const { stdout: gitName } = await exec(
      'git config user.name && git config user.email'
    )
    console.log('git author result:', gitName)

    // clone PR/newer repository/ref first to get settings
    if (!actionInfo.skipClone) {
      await cloneRepo(actionInfo.prRepo, diffRepoDir, actionInfo.prRef)
    }

    if (actionInfo.isRelease) {
      process.env.STATS_IS_RELEASE = 'true'
    }

    // load stats config from allowed locations
    const { statsConfig, relativeStatsAppDir } = loadStatsConfig()

    if (actionInfo.isLocal && actionInfo.prRef === statsConfig.mainBranch) {
      throw new Error(
        `'GITHUB_REF' can not be the same as mainBranch in 'stats-config.js'.\n` +
          `This will result in comparing against the same branch`
      )
    }

    if (actionInfo.isLocal) {
      // make sure to use local repo location instead of the
      // one provided in statsConfig
      statsConfig.mainRepo = actionInfo.prRepo
    }

    /* eslint-disable-next-line */
    actionInfo.commitId = await getCommitId(diffRepoDir)
    let mainNextSwcVersion

    if (!actionInfo.skipClone) {
      let mainRef = statsConfig.mainBranch

      if (actionInfo.isRelease) {
        logger(`Release detected, using last stable tag: "${actionInfo.prRef}"`)
        const lastStableTag = await getLastStable(diffRepoDir, actionInfo.prRef)
        mainRef = lastStableTag
        mainNextSwcVersion = lastStableTag
        if (!lastStableTag) throw new Error('failed to get last stable tag')
        logger(`using latestStable: "${lastStableTag}"`)

        /* eslint-disable-next-line */
        actionInfo.lastStableTag = lastStableTag
        /* eslint-disable-next-line */
        actionInfo.commitId = await getCommitId(diffRepoDir)

        if (!actionInfo.customCommentEndpoint) {
          /* eslint-disable-next-line */
          actionInfo.commentEndpoint = `https://api.github.com/repos/${statsConfig.mainRepo}/commits/${actionInfo.commitId}/comments`
        }
      }

      await cloneRepo(statsConfig.mainRepo, mainRepoDir, mainRef)

      if (!actionInfo.isRelease && statsConfig.autoMergeMain) {
        logger('Attempting auto merge of main branch')
        await mergeBranch(statsConfig.mainBranch, mainRepoDir, diffRepoDir)
      }
    }
    let mainRepoPkgPaths
    let diffRepoPkgPaths

    // run install/initialBuildCommand
    const repoDirs = [mainRepoDir, diffRepoDir]

    for (const dir of repoDirs) {
      logger(`Running initial build for ${dir}`)
      if (!actionInfo.skipClone) {
        const usePnpm = existsSync(path.join(dir, 'pnpm-lock.yaml'))

        if (!statsConfig.skipInitialInstall) {
          await exec.spawnPromise(
            `cd ${dir}${
              usePnpm
                ? // --no-frozen-lockfile is used here to tolerate lockfile
                  // changes from merging latest changes
                  ` && pnpm install --no-frozen-lockfile`
                : ' && yarn install --network-timeout 1000000'
            }`
          )

          await exec.spawnPromise(
            statsConfig.initialBuildCommand ||
              `cd ${dir} && ${usePnpm ? 'pnpm build' : 'echo built'}`
          )
        }
      }

      await fs
        .cp(
          path.join(__dirname, '../native'),
          path.join(dir, 'packages/next-swc/native'),
          { recursive: true, force: true }
        )
        .catch(console.error)

      logger(`Linking packages in ${dir}`)
      const isMainRepo = dir === mainRepoDir
      const pkgPaths = await linkPackages({
        repoDir: dir,
        nextSwcVersion: isMainRepo ? mainNextSwcVersion : null,
      })

      if (isMainRepo) mainRepoPkgPaths = pkgPaths
      else diffRepoPkgPaths = pkgPaths
    }

    // run the configs and post the comment
    const results = await runConfigs(statsConfig.configs, {
      statsConfig,
      mainRepoPkgPaths,
      diffRepoPkgPaths,
      relativeStatsAppDir,
    })
    await addComment(results, actionInfo, statsConfig)
    logger('finished')
    process.exit(0)
  } catch (err) {
    console.error('Error occurred generating stats:')
    console.error(err)
    process.exit(1)
  }
})()