name: Validate Commit Messages

on:
  pull_request:
    branches:
      - main
    types: [opened, synchronize, reopened, edited]

permissions:
  contents: read
  pull-requests: read

jobs:
  commit-lint:
    name: Conventional Commits Check
    runs-on: ubuntu-latest
    steps:
      - name: Checkout code
        uses: actions/checkout@v6
        with:
          fetch-depth: 0

      - name: Validate commit messages
        run: |
          echo "## 📋 Commit Message Validation" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          PATTERN='^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?(!)?: .+'

          ERROR_COUNT=0
          TOTAL_COUNT=0

          COMMITS=$(git log origin/${{ github.base_ref }}..HEAD --pretty=format:"%H %s")

          if [ -z "$COMMITS" ]; then
            echo "ℹ️  No commits to validate" >> $GITHUB_STEP_SUMMARY
            exit 0
          fi

          while IFS= read -r line; do
            HASH=$(echo "$line" | cut -d' ' -f1)
            MSG=$(echo "$line" | cut -d' ' -f2-)
            SHORT_HASH=$(echo "$HASH" | cut -c1-7)
            TOTAL_COUNT=$((TOTAL_COUNT + 1))

            if echo "$MSG" | grep -qE "^Merge "; then
              echo "⏭️ \`$SHORT_HASH\` - Merge commit (skipped)" >> $GITHUB_STEP_SUMMARY
              continue
            fi

            if echo "$MSG" | grep -qE "$PATTERN"; then
              echo "✅ \`$SHORT_HASH\` - $MSG" >> $GITHUB_STEP_SUMMARY
            else
              echo "❌ \`$SHORT_HASH\` - $MSG" >> $GITHUB_STEP_SUMMARY
              ERROR_COUNT=$((ERROR_COUNT + 1))
            fi
          done <<< "$COMMITS"

          echo "" >> $GITHUB_STEP_SUMMARY
          echo "---" >> $GITHUB_STEP_SUMMARY

          if [ $ERROR_COUNT -gt 0 ]; then
            echo "### ❌ $ERROR_COUNT of $TOTAL_COUNT commit(s) do not follow Conventional Commits" >> $GITHUB_STEP_SUMMARY
            exit 1
          else
            echo "### ✅ All $TOTAL_COUNT commit(s) follow Conventional Commits!" >> $GITHUB_STEP_SUMMARY
          fi

  pr-title-lint:
    name: PR Title Check
    runs-on: ubuntu-latest
    steps:
      - name: Validate PR title
        run: |
          PR_TITLE="${{ github.event.pull_request.title }}"
          PATTERN='^(feat|fix|docs|style|refactor|perf|test|build|ci|chore|revert)(\(.+\))?(!)?: .+'

          echo "## 📋 PR Title Validation" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Title:** $PR_TITLE" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          if echo "$PR_TITLE" | grep -qE "$PATTERN"; then
            echo "### ✅ PR title follows Conventional Commits format" >> $GITHUB_STEP_SUMMARY
          else
            echo "### ❌ PR title does not follow Conventional Commits format" >> $GITHUB_STEP_SUMMARY
            exit 1
          fi