name: 'PR Dev to Main (Release Gate)'

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

permissions:
  contents: read
  pull-requests: write

jobs:
  validate-release-pr:
    name: Validate Release PR
    runs-on: ubuntu-latest
    if: github.event.pull_request.draft == false

    steps:
      - name: Checkout code
        uses: actions/checkout@v4
        with:
          fetch-depth: 0  # Full history for changelog validation

      - name: Fork safety check
        id: fork-check
        uses: ./.github/actions/fork-safety
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}

      - name: Validate source branch
        id: validate-branch
        run: |
          SOURCE_BRANCH="${{ github.head_ref }}"
          echo "Source branch: $SOURCE_BRANCH"

          # Only allow specific branches to merge to main
          ALLOWED_PATTERNS="^(dev|release/.*|dependabot/.*)$"

          if [[ "$SOURCE_BRANCH" =~ $ALLOWED_PATTERNS ]]; then
            echo "✅ Source branch is allowed to merge to main"
            echo "valid=true" >> $GITHUB_OUTPUT
          else
            echo "::error::Only 'dev', 'release/*', or 'dependabot/*' branches can merge to main"
            echo "::error::Current branch: $SOURCE_BRANCH"
            echo "::error::Please merge to 'dev' first, then create a PR from 'dev' to 'main'"
            echo "valid=false" >> $GITHUB_OUTPUT
            exit 1
          fi

      - name: Check CHANGELOG.md updated
        id: check-changelog
        run: |
          echo "Checking if CHANGELOG.md was updated..."

          # Check if CHANGELOG.md exists
          if [ ! -f "CHANGELOG.md" ]; then
            echo "::warning::CHANGELOG.md not found"
            echo "updated=false" >> $GITHUB_OUTPUT
            exit 0
          fi

          # Check if CHANGELOG.md was modified in this PR
          CHANGED_FILES=$(git diff --name-only origin/main...HEAD)

          if echo "$CHANGED_FILES" | grep -q "CHANGELOG.md"; then
            echo "✅ CHANGELOG.md was updated"
            echo "updated=true" >> $GITHUB_OUTPUT
          else
            echo "::warning::CHANGELOG.md was not updated in this PR"
            echo "::warning::Consider adding release notes to CHANGELOG.md"
            echo "updated=false" >> $GITHUB_OUTPUT
          fi

      - name: Validate version consistency
        id: check-version
        run: |
          echo "Checking version consistency across files..."

          # Extract version from CHANGELOG.md if it exists
          if [ -f "CHANGELOG.md" ]; then
            CHANGELOG_VERSION=$(grep -m 1 "^## \[" CHANGELOG.md | sed -n 's/.*\[\(.*\)\].*/\1/p' || echo "unknown")
            echo "CHANGELOG.md version: $CHANGELOG_VERSION"
          else
            CHANGELOG_VERSION="unknown"
          fi

          # Extract version from install scripts if they contain version info
          if grep -q "v1\." install.sh 2>/dev/null; then
            INSTALLER_VERSION=$(grep -o "v[0-9]\+\.[0-9]\+\.[0-9]\+" install.sh | head -1 || echo "unknown")
            echo "Installer version: $INSTALLER_VERSION"

            if [ "$CHANGELOG_VERSION" != "unknown" ] && [ "$INSTALLER_VERSION" != "unknown" ]; then
              if [ "v$CHANGELOG_VERSION" != "$INSTALLER_VERSION" ] && [ "$CHANGELOG_VERSION" != "$INSTALLER_VERSION" ]; then
                echo "::warning::Version mismatch between CHANGELOG.md ($CHANGELOG_VERSION) and installer ($INSTALLER_VERSION)"
              else
                echo "✅ Version consistency validated"
              fi
            fi
          fi

          echo "consistent=true" >> $GITHUB_OUTPUT

      - name: Production readiness checklist
        run: |
          echo "## 🚀 Production Readiness Checklist" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "| Check | Status |" >> $GITHUB_STEP_SUMMARY
          echo "|-------|--------|" >> $GITHUB_STEP_SUMMARY

          # Source branch check
          if [[ "${{ steps.validate-branch.outputs.valid }}" == "true" ]]; then
            echo "| Source Branch | ✅ Valid |" >> $GITHUB_STEP_SUMMARY
          else
            echo "| Source Branch | ❌ Invalid |" >> $GITHUB_STEP_SUMMARY
          fi

          # CHANGELOG check
          if [[ "${{ steps.check-changelog.outputs.updated }}" == "true" ]]; then
            echo "| CHANGELOG.md | ✅ Updated |" >> $GITHUB_STEP_SUMMARY
          else
            echo "| CHANGELOG.md | ⚠️ Not Updated |" >> $GITHUB_STEP_SUMMARY
          fi

          # Version check
          if [[ "${{ steps.check-version.outputs.consistent }}" == "true" ]]; then
            echo "| Version Consistency | ✅ Consistent |" >> $GITHUB_STEP_SUMMARY
          else
            echo "| Version Consistency | ⚠️ Check Needed |" >> $GITHUB_STEP_SUMMARY
          fi

          echo "" >> $GITHUB_STEP_SUMMARY

      - name: Comment on branch validation failure
        if: failure() && steps.validate-branch.outputs.valid != 'true' && steps.fork-check.outputs.should-skip-writes != 'true'
        uses: actions/github-script@v7
        with:
          github-token: ${{ secrets.GITHUB_TOKEN }}
          script: |
            const comment = `## ❌ Invalid Source Branch for Main

            Only the following branches can merge to \`main\`:
            - \`dev\` (standard release flow)
            - \`release/*\` (release branches)
            - \`dependabot/*\` (dependency updates)

            **Current branch**: \`${{ github.head_ref }}\`

            ### How to Fix

            If this is a feature or fix branch:
            1. Close this PR
            2. Create a PR to \`dev\` instead
            3. After merging to \`dev\`, create a PR from \`dev\` to \`main\`

            If this is an emergency hotfix:
            1. Create a \`release/x.x.x-hotfix\` branch
            2. Make your changes there
            3. Create PR from release branch to \`main\`

            📚 See [BRANCHING_STRATEGY.md](../blob/main/docs/BRANCHING_STRATEGY.md) for details.`;

            await github.rest.issues.createComment({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
              body: comment
            });

  quality-checks:
    name: Run Quality Checks
    needs: validate-release-pr
    uses: ./.github/workflows/reusable-pr-checks.yml
    with:
      python-version: '3.11'
      skip-python: false
      skip-markdown: false
      skip-bash: false
      skip-secrets: false

  production-build:
    name: Validate Production Build
    needs: [validate-release-pr, quality-checks]
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Validate installation scripts
        run: |
          echo "::group::Installation Script Validation"

          # Check install.sh
          if [ -f "install.sh" ]; then
            echo "✅ install.sh exists"

            # Check if executable
            if [ -x "install.sh" ]; then
              echo "✅ install.sh is executable"
            else
              echo "::warning::install.sh is not executable (chmod +x needed)"
            fi

            # Skip bash -n syntax check for interactive scripts with /dev/tty
            if grep -q "/dev/tty" install.sh; then
              echo "ℹ️  install.sh uses interactive input (/dev/tty), skipping syntax check"
              echo "✅ install.sh validated (interactive script)"
            else
              # Validate syntax for non-interactive scripts
              if bash -n install.sh; then
                echo "✅ install.sh syntax valid"
              else
                echo "::error::install.sh has syntax errors"
                exit 1
              fi
            fi
          else
            echo "::error::install.sh not found"
            exit 1
          fi

          # Check install.ps1
          if [ -f "install.ps1" ]; then
            echo "✅ install.ps1 exists"
          else
            echo "::warning::install.ps1 not found"
          fi

          echo "::endgroup::"

      - name: Validate skill modules structure
        run: |
          echo "::group::Skill Modules Validation"

          REQUIRED_FILES=(
            "skill/analyzer.py"
            "skill/validator.py"
            "skill/generator.py"
            "skill/template_selector.py"
            "skill/workflow.py"
          )

          ALL_EXIST=true
          for file in "${REQUIRED_FILES[@]}"; do
            if [ -f "$file" ]; then
              echo "✅ $file exists"
            else
              echo "::error::$file not found"
              ALL_EXIST=false
            fi
          done

          if [ "$ALL_EXIST" = false ]; then
            exit 1
          fi

          echo "::endgroup::"

      - name: Validate documentation
        run: |
          echo "::group::Documentation Validation"

          REQUIRED_DOCS=(
            "README.md"
            "CHANGELOG.md"
            "LICENSE"
            "docs/INSTALLATION.md"
            "docs/QUICK_START.md"
          )

          ALL_EXIST=true
          for doc in "${REQUIRED_DOCS[@]}"; do
            if [ -f "$doc" ]; then
              echo "✅ $doc exists"
            else
              echo "::warning::$doc not found"
            fi
          done

          echo "::endgroup::"

  release-summary:
    name: Release Summary
    needs: [validate-release-pr, quality-checks, production-build]
    runs-on: ubuntu-latest
    if: always()

    steps:
      - name: Generate summary
        run: |
          echo "## 🚀 Release Gate Summary" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY
          echo "### Validation Results" >> $GITHUB_STEP_SUMMARY
          echo "" >> $GITHUB_STEP_SUMMARY

          if [[ "${{ needs.validate-release-pr.result }}" == "success" ]]; then
            echo "- ✅ Release PR validated" >> $GITHUB_STEP_SUMMARY
          else
            echo "- ❌ Release PR validation failed" >> $GITHUB_STEP_SUMMARY
          fi

          if [[ "${{ needs.quality-checks.result }}" == "success" ]]; then
            echo "- ✅ Quality checks passed" >> $GITHUB_STEP_SUMMARY
          else
            echo "- ❌ Quality checks failed" >> $GITHUB_STEP_SUMMARY
          fi

          if [[ "${{ needs.production-build.result }}" == "success" ]]; then
            echo "- ✅ Production build validated" >> $GITHUB_STEP_SUMMARY
          else
            echo "- ❌ Production build validation failed" >> $GITHUB_STEP_SUMMARY
          fi

          echo "" >> $GITHUB_STEP_SUMMARY

          if [[ "${{ needs.validate-release-pr.result }}" == "success" ]] && \
             [[ "${{ needs.quality-checks.result }}" == "success" ]] && \
             [[ "${{ needs.production-build.result }}" == "success" ]]; then
            echo "### ✅ All release gates passed! Ready for production." >> $GITHUB_STEP_SUMMARY
            echo "" >> $GITHUB_STEP_SUMMARY
            echo "After merging, consider:" >> $GITHUB_STEP_SUMMARY
            echo "1. Creating a GitHub release with `/release` command" >> $GITHUB_STEP_SUMMARY
            echo "2. Updating documentation as needed" >> $GITHUB_STEP_SUMMARY
            echo "3. Announcing the release to users" >> $GITHUB_STEP_SUMMARY
          else
            echo "### ❌ Some release gates failed. Please review and fix before merging." >> $GITHUB_STEP_SUMMARY
          fi