#!/usr/bin/env node
const { promises: fs } = require('fs')
const path = require('path')
const fetch = require('node-fetch')
const VERSION = require('../dist/chrome/manifest.json').version // eslint-disable-line import/no-unresolved

start().catch(console.error)

function capitalizeFirstLetter (string) {
  return string.charAt(0).toUpperCase() + string.slice(1)
}

async function start () {

  const { GITHUB_COMMENT_TOKEN, CIRCLE_PULL_REQUEST } = process.env
  console.log('CIRCLE_PULL_REQUEST', CIRCLE_PULL_REQUEST)
  const { CIRCLE_SHA1 } = process.env
  console.log('CIRCLE_SHA1', CIRCLE_SHA1)
  const { CIRCLE_BUILD_NUM } = process.env
  console.log('CIRCLE_BUILD_NUM', CIRCLE_BUILD_NUM)

  if (!CIRCLE_PULL_REQUEST) {
    console.warn(`No pull request detected for commit "${CIRCLE_SHA1}"`)
    return
  }

  const CIRCLE_PR_NUMBER = CIRCLE_PULL_REQUEST.split('/').pop()
  const SHORT_SHA1 = CIRCLE_SHA1.slice(0, 7)
  const BUILD_LINK_BASE = `https://${CIRCLE_BUILD_NUM}-42009758-gh.circle-artifacts.com/0`

  // build the github comment content

  // links to extension builds
  const platforms = ['chrome', 'firefox', 'opera']
  const buildLinks = platforms.map((platform) => {
    const url = `${BUILD_LINK_BASE}/builds/metamask-${platform}-${VERSION}.zip`
    return `<a href="${url}">${platform}</a>`
  }).join(', ')

  // links to bundle browser builds
  const bundles = ['background', 'ui', 'inpage', 'contentscript', 'ui-libs', 'bg-libs', 'phishing-detect']
  const bundleLinks = bundles.map((bundle) => {
    const url = `${BUILD_LINK_BASE}/build-artifacts/source-map-explorer/${bundle}.html`
    return `<a href="${url}">${bundle}</a>`
  }).join(', ')

  // links to bundle browser builds
  const depVizUrl = `${BUILD_LINK_BASE}/build-artifacts/deps-viz/background/index.html`
  const depVizLink = `<a href="${depVizUrl}">background</a>`

  // link to artifacts
  const allArtifactsUrl = `https://circleci.com/gh/MetaMask/metamask-extension/${CIRCLE_BUILD_NUM}#artifacts/containers/0`

  const contentRows = [
    `builds: ${buildLinks}`,
    `bundle viz: ${bundleLinks}`,
    `dep viz: ${depVizLink}`,
    `<a href="${allArtifactsUrl}">all artifacts</a>`,
  ]
  const hiddenContent = `<ul>` + contentRows.map((row) => `<li>${row}</li>`).join('\n') + `</ul>`
  const exposedContent = `Builds ready [${SHORT_SHA1}]`
  const artifactsBody = `<details><summary>${exposedContent}</summary>${hiddenContent}</details>`

  const benchmarkResults = {}
  for (const platform of platforms) {
    const benchmarkPath = path.resolve(__dirname, '..', path.join('test-artifacts', platform, 'benchmark', 'pageload.json'))
    try {
      const data = await fs.readFile(benchmarkPath, 'utf8')
      const benchmark = JSON.parse(data)
      benchmarkResults[platform] = benchmark
    } catch (error) {
      if (error.code === 'ENOENT') {
        console.log(`No benchmark data found for ${platform}; skipping`)
      } else {
        console.error(`Error encountered processing benchmark data for '${platform}': '${error}'`)
      }
    }
  }

  const summaryPlatform = 'chrome'
  const summaryPage = 'home'
  let commentBody
  if (benchmarkResults[summaryPlatform]) {
    try {
      const summaryPageLoad = Math.round(parseFloat(benchmarkResults[summaryPlatform][summaryPage].average.load))
      const summaryPageLoadMarginOfError = Math.round(parseFloat(benchmarkResults[summaryPlatform][summaryPage].marginOfError.load))
      const benchmarkSummary = `Page Load Metrics (${summaryPageLoad} ± ${summaryPageLoadMarginOfError} ms)`

      const allPlatforms = new Set()
      const allPages = new Set()
      const allMetrics = new Set()
      const allMeasures = new Set()
      for (const platform of Object.keys(benchmarkResults)) {
        allPlatforms.add(platform)
        const platformBenchmark = benchmarkResults[platform]
        const pages = Object.keys(platformBenchmark)
        for (const page of pages) {
          allPages.add(page)
          const pageBenchmark = platformBenchmark[page]
          const measures = Object.keys(pageBenchmark)
          for (const measure of measures) {
            allMeasures.add(measure)
            const measureBenchmark = pageBenchmark[measure]
            const metrics = Object.keys(measureBenchmark)
            for (const metric of metrics) {
              allMetrics.add(metric)
            }
          }
        }
      }

      const tableRows = []
      for (const platform of allPlatforms) {
        const pageRows = []
        for (const page of allPages) {
          const metricRows = []
          for (const metric of allMetrics) {
            let metricData = `<td>${metric}</td>`
            for (const measure of allMeasures) {
              metricData += `<td align="right">${Math.round(parseFloat(benchmarkResults[platform][page][measure][metric]))}</td>`
            }
            metricRows.push(metricData)
          }
          metricRows[0] = `<td rowspan="${allMetrics.size}">${capitalizeFirstLetter(page)}</td>${metricRows[0]}`
          pageRows.push(...metricRows)
        }
        pageRows[0] = `<td rowspan="${allPages.size * allMetrics.size}">${capitalizeFirstLetter(platform)}</td>${pageRows[0]}`
        for (const row of pageRows) {
          tableRows.push(`<tr>${row}</tr>`)
        }
      }

      const benchmarkTableHeaders = ['Platform', 'Page', 'Metric']
      for (const measure of allMeasures) {
        benchmarkTableHeaders.push(`${capitalizeFirstLetter(measure)} (ms)`)
      }
      const benchmarkTableHeader = `<thead><tr>${benchmarkTableHeaders.map((header) => `<th>${header}</th>`).join('')}</tr></thead>`
      const benchmarkTableBody = `<tbody>${tableRows.join('')}</tbody>`
      const benchmarkTable = `<table>${benchmarkTableHeader}${benchmarkTableBody}</table>`
      const benchmarkBody = `<details><summary>${benchmarkSummary}</summary>${benchmarkTable}</details>`
      commentBody = `${artifactsBody}${benchmarkBody}`
    } catch (error) {
      console.error(`Error constructing benchmark results: '${error}'`)
      commentBody = artifactsBody
    }
  } else {
    console.log(`No results for ${summaryPlatform} found; skipping benchmark`)
    commentBody = artifactsBody
  }

  const JSON_PAYLOAD = JSON.stringify({ body: commentBody })
  const POST_COMMENT_URI = `https://api.github.com/repos/metamask/metamask-extension/issues/${CIRCLE_PR_NUMBER}/comments`
  console.log(`Announcement:\n${commentBody}`)
  console.log(`Posting to: ${POST_COMMENT_URI}`)

  const response = await fetch(POST_COMMENT_URI, {
    method: 'POST',
    body: JSON_PAYLOAD,
    headers: {
      'User-Agent': 'metamaskbot',
      'Authorization': `token ${GITHUB_COMMENT_TOKEN}`,
    },
  })
  if (!response.ok) {
    throw new Error(`Post comment failed with status '${response.statusText}'`)
  }
}