import { danger, fail } from 'danger'

// Check if we should run the checks
const shouldRunChecks = async () => {
  const allChangedFiles = [
    ...danger.git.modified_files,
    ...danger.git.created_files
  ]
  const srcChanges = allChangedFiles.filter((file) => file.startsWith('src/'))

  if (srcChanges.length === 0) {
    return false
  }

  // Check total lines changed in src files
  let totalLinesChanged = 0
  for (const file of srcChanges) {
    const diff = await danger.git.diffForFile(file)
    if (diff) {
      // Count only lines with actual content (non-empty after trimming whitespace)
      // This excludes empty lines and lines containing only spaces/tabs
      const additions =
        diff.added?.split('\n').filter((line) => line.trim()).length || 0
      const deletions =
        diff.removed?.split('\n').filter((line) => line.trim()).length || 0
      totalLinesChanged += additions + deletions
    }
  }

  return totalLinesChanged > 3
}

// Check if browser tests were updated
const checkBrowserTestCoverage = () => {
  const allChangedFiles = [
    ...danger.git.modified_files,
    ...danger.git.created_files
  ]
  const hasBrowserTestChanges = allChangedFiles.some(
    (file) => file.startsWith('browser_tests/') && file.endsWith('.ts')
  )

  if (!hasBrowserTestChanges) {
    fail(`🧪 **E2E Test Coverage Missing**

All changes should be covered under E2E testing. Please add or update browser tests.`)
  }
}

// Check for screen recording in PR description
const checkScreenRecording = () => {
  const description = danger.github.pr.body || ''
  const hasRecording =
    /github\.com\/user-attachments\/assets\/[a-f0-9-]+/i.test(description) ||
    /youtube\.com\/watch|youtu\.be\//i.test(description)

  if (!hasRecording) {
    fail(`📹 **Visual Documentation Missing**

Please add a screen recording or screenshot:
- GitHub: Drag & drop media to PR description  
- YouTube: Add YouTube link`)
  }
}

// Run the checks only if conditions are met
shouldRunChecks().then((shouldRun) => {
  if (shouldRun) {
    checkBrowserTestCoverage()
    checkScreenRecording()
  }
})