const github = require('@actions/github')
const core = require('@actions/core')
const fs = require('fs')
const path = require('path')
const os = require('os')

async function run() {
  try {
    core.debug(
      ` Available environment variables:\n -> ${Object.keys(process.env)
        .map(i => i + ' :: ' + process.env[i])
        .join('\n -> ')}`
    )

    const dir = fs
      .readdirSync(path.resolve(process.env.GITHUB_WORKSPACE), { withFileTypes: true })
      .map(entry => {
        return `${entry.isDirectory() ? '> ' : '  - '}${entry.name}`
      })
      .join('\n')

    core.debug(` Working Directory: ${process.env.GITHUB_WORKSPACE}:\n${dir}`)

    if (!process.env.hasOwnProperty('GITHUB_TOKEN')) {
      if (!process.env.hasOwnProperty('INPUT_GITHUB_TOKEN')) {
        core.setFailed('Invalid or missing GITHUB_TOKEN.')
        return
      }
    } 

    const pkg_root = core.getInput('package_root', { required: false })
    const pkgfile = path.join(process.env.GITHUB_WORKSPACE, pkg_root, 'package.json')
    if (!fs.existsSync(pkgfile)) {
      core.setFailed('package.json does not exist.')
      return
    }

    const pkg = require(pkgfile)
    core.setOutput('version', pkg.version)
    core.debug(` Detected version ${pkg.version}`)

    // Check for existing tag
    const git = new github.GitHub(process.env.INPUT_GITHUB_TOKEN || process.env.GITHUB_TOKEN)
    const owner = process.env.GITHUB_REPOSITORY.split('/').shift()
    const repo = process.env.GITHUB_REPOSITORY.split('/').pop()

    let tags
    try {
      tags = await git.repos.listTags({
        ...repo,
        per_page: 100,
      })
    } catch (e) {
      tags = {
        data: [],
      }
    }

    const getTagName = version => {
      const tagPrefix = core.getInput('tag_prefix', { required: false })
      const tagSuffix = core.getInput('tag_suffix', { required: false })
      return `${tagPrefix}${version}${tagSuffix}`
    }

    // Check for existance of tag and abort (short circuit) if it already exists.
    for (let tag of tags.data) {
      if (tag.name === getTagName(pkg.version)) {
        core.warning(`"${tag.name.trim()}" tag already exists.` + os.EOL)
        core.setOutput('tagname', '')
        return
      }
    }

    // Create the new tag name
    const tagName = getTagName(pkg.version)

    let tagMsg = core.getInput('tag_message', { required: false }).trim()
    if (tagMsg.length === 0 && tags.data.length > 0) {
      try {
        latestTag = tags.data.shift()

        let changelog = await git.repos.compareCommits({
          ...repo,
          base: latestTag.name,
          head: 'master',
        })

        tagMsg = changelog.data.commits
          .map(
            commit =>
              `**1) ${commit.commit.message}**${
                commit.hasOwnProperty('author')
                  ? commit.author.hasOwnProperty('login')
                    ? ' (' + commit.author.login + ')'
                    : ''
                  : ''
              }\n(SHA: ${commit.sha})\n`
          )
          .join('\n')
      } catch (e) {
        core.warning('Failed to generate changelog from commits: ' + e.message + os.EOL)
        tagMsg = tagName
      }
    }

    let newTag
    try {
      tagMsg = tagMsg.trim().length > 0 ? tagMsg : `Version ${pkg.version}`

      newTag = await git.git.createTag({
        ...repo,
        tag: tagName,
        message: tagMsg,
        object: process.env.GITHUB_SHA,
        type: 'commit',
      })

      console.log(`Created new tag: ${newTag.data.tag}` + os.EOL)
    } catch (e) {
      core.setFailed(e.message)
      return
    }

    let newReference
    try {
      newReference = await git.git.createRef({
        ...repo,
        ref: `refs/tags/${newTag.data.tag}`,
        sha: newTag.data.sha,
      })

      console.log(`Reference ${newReference.data.ref} available at ${newReference.data.url}` + os.EOL)
    } catch (e) {
      core.warning({
        ...repo,
        ref: `refs/tags/${newTag.data.tag}`,
        sha: newTag.data.sha,
      })

      core.setFailed(e.message)
      return
    }

    // Store values for other actions
    if (typeof newTag === 'object' && typeof newReference === 'object') {
      core.setOutput('tagname', tagName)
      core.setOutput('tagsha', newTag.data.sha)
      core.setOutput('taguri', newReference.data.url)
      core.setOutput('tagmessage', tagMsg.trim())
      core.setOutput('tagref', newReference.data.ref)
    }
  } catch (error) {
    core.warning(error.message)
    core.setOutput('tagname', '')
    core.setOutput('tagsha', '')
    core.setOutput('taguri', '')
    core.setOutput('tagmessage', '')
    core.setOutput('tagref', '')
  }
}

run()