name: Create Release

# This workflow creates git tags and GitHub releases after version bump PRs are merged.
# It detects when a version bump PR (with 'version-bump' label) is merged and creates
# the corresponding tag and release automatically.

on:
  push:
    branches: [main]
  workflow_dispatch:
    inputs:
      version:
        description: 'Version to release (e.g., 0.5.0)'
        required: false
        type: string

permissions:
  contents: write

jobs:
  check-if-version-bump:
    name: Check if Version Bump PR Merged
    runs-on: ubuntu-latest
    outputs:
      should_release: ${{ steps.check.outputs.should_release }}
      version: ${{ steps.check.outputs.version }}
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 2
      
      - name: Check if this was a version bump PR merge
        id: check
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            
            // Manual trigger - use provided version
            if (context.eventName === 'workflow_dispatch' && context.payload.inputs.version) {
              core.setOutput('should_release', 'true');
              core.setOutput('version', context.payload.inputs.version);
              console.log(`Manual release triggered for version: ${context.payload.inputs.version}`);
              return;
            }
            
            // Get the commit that triggered this workflow
            const commit = context.sha;
            
            // Find PRs that were merged with this commit
            const { data: prs } = await github.rest.repos.listPullRequestsAssociatedWithCommit({
              owner: context.repo.owner,
              repo: context.repo.repo,
              commit_sha: commit
            });
            
            // Check if any of these PRs had the version-bump label
            const versionBumpPR = prs.find(pr => 
              pr.labels.some(label => label.name === 'version-bump')
            );
            
            if (versionBumpPR) {
              console.log(`Version bump PR detected: #${versionBumpPR.number}`);
              
              // Read VERSION file to get the new version
              const version = fs.readFileSync('VERSION', 'utf8').trim();
              
              core.setOutput('should_release', 'true');
              core.setOutput('version', version);
              console.log(`Will create release for version: ${version}`);
            } else {
              console.log('Not a version bump PR - skipping release creation');
              core.setOutput('should_release', 'false');
            }

  create-tag-and-release:
    name: Create Git Tag and GitHub Release
    runs-on: ubuntu-latest
    needs: check-if-version-bump
    if: needs.check-if-version-bump.outputs.should_release == 'true'
    
    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0
      
      - name: Configure Git
        run: |
          git config user.name "github-actions[bot]"
          git config user.email "github-actions[bot]@users.noreply.github.com"
      
      - name: Check if tag already exists
        id: check_tag
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          
          if git rev-parse "v$VERSION" >/dev/null 2>&1; then
            echo "tag_exists=true" >> $GITHUB_OUTPUT
            echo "⚠️ Tag v$VERSION already exists"
          else
            echo "tag_exists=false" >> $GITHUB_OUTPUT
            echo "✅ Tag v$VERSION does not exist - will create"
          fi
      
      - name: Create git tag
        if: steps.check_tag.outputs.tag_exists == 'false'
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          
          echo "Creating tag: v$VERSION"
          git tag "v$VERSION"
          git push origin "v$VERSION"
          
          echo "## ✅ Git Tag Created" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "- **Tag:** v$VERSION" >> $GITHUB_STEP_SUMMARY
          echo "- **Commit:** ${{ github.sha }}" >> $GITHUB_STEP_SUMMARY
      
      - name: Extract release notes from CHANGELOG
        id: release_notes
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          
          if [ -f CHANGELOG.md ]; then
            RELEASE_NOTES=$(awk '/^## \['"$VERSION"'\]/{flag=1; next} /^## \[/{flag=0} flag' CHANGELOG.md)
            
            if [ -z "$RELEASE_NOTES" ]; then
              RELEASE_NOTES="Release v$VERSION

          See [CHANGELOG.md](CHANGELOG.md) for details."
            fi
          else
            RELEASE_NOTES="Release v$VERSION"
          fi
          
          echo "$RELEASE_NOTES" > /tmp/release_notes.md
          
          echo "## 📝 Release Notes Preview" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
          cat /tmp/release_notes.md >> $GITHUB_STEP_SUMMARY
          echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
      
      - name: Check if release already exists
        id: check_release
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          
          if gh release view "v$VERSION" >/dev/null 2>&1; then
            echo "release_exists=true" >> $GITHUB_OUTPUT
            echo "⚠️ Release v$VERSION already exists"
          else
            echo "release_exists=false" >> $GITHUB_OUTPUT
            echo "✅ Release v$VERSION does not exist - will create"
          fi
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Create GitHub release
        if: steps.check_release.outputs.release_exists == 'false'
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          
          echo "Creating GitHub release: v$VERSION"
          
          gh release create "v$VERSION" \
            --title "v$VERSION" \
            --notes-file /tmp/release_notes.md \
            --latest
          
          echo "## 🚀 GitHub Release Created" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "- **Release:** v$VERSION" >> $GITHUB_STEP_SUMMARY
          echo "- **URL:** https://github.com/${{ github.repository }}/releases/tag/v$VERSION" >> $GITHUB_STEP_SUMMARY
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
      
      - name: Summary
        if: always()
        run: |
          VERSION="${{ needs.check-if-version-bump.outputs.version }}"
          TAG_EXISTS="${{ steps.check_tag.outputs.tag_exists }}"
          RELEASE_EXISTS="${{ steps.check_release.outputs.release_exists }}"
          
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "---" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### 📊 Release Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "**Version:** v$VERSION" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          
          if [ "$TAG_EXISTS" = "true" ]; then
            echo "- ⏭️ Git tag already existed (skipped)" >> $GITHUB_STEP_SUMMARY
          else
            echo "- ✅ Git tag created" >> $GITHUB_STEP_SUMMARY
          fi
          
          if [ "$RELEASE_EXISTS" = "true" ]; then
            echo "- ⏭️ GitHub release already existed (skipped)" >> $GITHUB_STEP_SUMMARY
          else
            echo "- ✅ GitHub release created" >> $GITHUB_STEP_SUMMARY
          fi
          
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "🎉 **Release v$VERSION is now available!**" >> $GITHUB_STEP_SUMMARY