import { execSync } from 'child_process'
import { basename, join } from 'path'
import { ICONS_SRC_DIR, parseMatter } from './helpers.mjs'

// Check icon files added relative to base branch (for PR)
function getAddedIconsFromMain() {
  try {
    // Use BASE_SHA or BASE_REF from environment, fallback to origin/main
    const baseRef = process.env.BASE_SHA || process.env.BASE_REF || 'origin/main'
    const output = execSync(`git diff ${baseRef}...HEAD --name-status`, { encoding: 'utf-8' })
    const addedIcons = []

    output.split('\n').forEach(line => {
      if (line.startsWith('A\t')) {
        const filePath = line.substring(2)
        // Filter only SVG files from icons/outline/ or icons/filled/ directories
        if (filePath.match(/^icons\/(outline|filled)\/.+\.svg$/)) {
          const iconPath = filePath.replace(/^icons\//, '')
          addedIcons.push(iconPath)
        }
      }
    })

    return addedIcons
  } catch (error) {
    // Fallback: check relative to HEAD if base ref doesn't exist
    try {
      const output = execSync('git diff --diff-filter=A --name-only', { encoding: 'utf-8' })
      const addedIcons = []

      output.split('\n').forEach(filePath => {
        if (filePath && filePath.match(/^icons\/(outline|filled)\/.+\.svg$/)) {
          const iconPath = filePath.replace(/^icons\//, '')
          addedIcons.push(iconPath)
        }
      })

      return addedIcons
    } catch {
      return []
    }
  }
}

// Get GitHub raw file URL for icon
function getIconRawUrl(iconPath) {
  // Use PR repo and SHA if available (for forks), otherwise fallback to current repo
  const repo = process.env.PR_REPO || process.env.GITHUB_REPOSITORY || 'tabler/tabler-icons'
  const ref = process.env.PR_SHA || process.env.GITHUB_SHA || 'main'
  return `https://raw.githubusercontent.com/${repo}/${ref}/icons/${iconPath}`
}

// Generate markdown table for icons
function generateIconsTable(icons, type) {
  if (icons.length === 0) {
    return ''
  }

  const typeName = type === 'outline' ? 'Outline' : 'Filled'
  let markdown = `### ${typeName} Icons (${icons.length})\n\n`
  markdown += `| Icon | Name ${type === 'outline' ? '| Category | Tags ' : ''}|\n`
  markdown += `|------|------${type === 'outline' ? '|------|------' : ''}|\n`
  
  icons.forEach(iconPath => {
    const iconName = basename(iconPath, '.svg')
    const rawUrl = getIconRawUrl(iconPath)

    const { data } = parseMatter(join(ICONS_SRC_DIR, iconPath))
    const category = data.category || ''
    const tags = data.tags || []
    
    // Use GitHub raw file URL - GitHub Comments support external image URLs
    markdown += `| <img src="${rawUrl}" width="240" height="240" alt="${iconName}" /> | \`${iconName}.svg\`${type === 'outline' ? ` | ${category || '❌ No category'} | ${tags.join(', ') || '❌ No tags' }` : ''}|\n`
  })
  markdown += `\n`

  return markdown
}

// Generate markdown comment with table of added icons
function generateIconsComment(icons) {
  if (icons.length === 0) {
    return ''
  }

  // Group icons by type (outline/filled) with full paths
  const outlineIcons = icons.filter(icon => icon.startsWith('outline/'))
  const filledIcons = icons.filter(icon => icon.startsWith('filled/'))

  let markdown = `## 📦 Added Icons\n\n`
  markdown += `This PR adds **${icons.length}** new icon${icons.length > 1 ? 's' : ''}.\n\n`

  markdown += generateIconsTable(outlineIcons, 'outline')
  markdown += generateIconsTable(filledIcons, 'filled')

  return markdown
}

const addedIcons = getAddedIconsFromMain()

if (addedIcons.length > 0) {
  const comment = generateIconsComment(addedIcons)
  console.log(comment)
} else {
  process.exit(0)
}