name: E2E Compilation Validation

on:
  push:
    branches: [ main, develop, "feature/*", "hotfix/*" ]
  pull_request:
    branches: [ main, develop ]
  schedule:
    # Run nightly at 2 AM UTC for comprehensive validation
    - cron: '0 2 * * *'
  workflow_dispatch:
    inputs:
      validation_mode:
        description: 'Validation mode to run'
        required: true
        default: 'all'
        type: choice
        options:
          - all
          - libs
          - bins  
          - tests
          - examples
          - docker
      continue_on_error:
        description: 'Continue validation even if some targets fail'
        required: false
        default: false
        type: boolean
      skip_docker:
        description: 'Skip Docker validation'
        required: false
        default: false
        type: boolean

env:
  CARGO_TERM_COLOR: always
  RUST_BACKTRACE: 1
  # Optimize compilation performance
  CARGO_INCREMENTAL: 0
  CARGO_NET_RETRY: 10
  RUSTUP_MAX_RETRIES: 10

jobs:
  setup:
    name: Setup Environment
    runs-on: ubuntu-latest
    outputs:
      rust-version: ${{ steps.rust-version.outputs.version }}
      cache-key: ${{ steps.cache-key.outputs.key }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Extract Rust version
        id: rust-version
        run: |
          RUST_VERSION=$(grep '^rust-version' Cargo.toml | sed 's/.*"\([^"]*\)".*/\1/')
          echo "version=$RUST_VERSION" >> $GITHUB_OUTPUT
          echo "Detected Rust version: $RUST_VERSION"

      - name: Generate cache key
        id: cache-key
        run: |
          HASH=$(sha256sum Cargo.lock | cut -d' ' -f1)
          echo "key=cargo-${{ runner.os }}-${{ steps.rust-version.outputs.version }}-$HASH" >> $GITHUB_OUTPUT

  validate-compilation:
    name: E2E Compilation Validation
    runs-on: ubuntu-latest
    needs: setup
    strategy:
      matrix:
        validation_mode: 
          - ${{ github.event.inputs.validation_mode || 'all' }}
      fail-fast: false
    
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Setup Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          toolchain: ${{ needs.setup.outputs.rust-version }}
          components: clippy, rustfmt

      - name: Setup sccache
        uses: mozilla-actions/sccache-action@v0.0.3
        with:
          version: "v0.5.4"

      - name: Configure sccache
        run: |
          echo "RUSTC_WRAPPER=sccache" >> $GITHUB_ENV
          echo "SCCACHE_GHA_ENABLED=true" >> $GITHUB_ENV

      - name: Cache Cargo registry and index
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry/index/
            ~/.cargo/registry/cache/
            ~/.cargo/git/db/
          key: ${{ needs.setup.outputs.cache-key }}-registry
          restore-keys: |
            cargo-${{ runner.os }}-${{ needs.setup.outputs.rust-version }}-

      - name: Cache target directory
        uses: actions/cache@v4
        with:
          path: target/
          key: ${{ needs.setup.outputs.cache-key }}-target-${{ matrix.validation_mode }}
          restore-keys: |
            ${{ needs.setup.outputs.cache-key }}-target-
            cargo-${{ runner.os }}-${{ needs.setup.outputs.rust-version }}-target-

      - name: Setup Docker Buildx
        if: matrix.validation_mode == 'all' || matrix.validation_mode == 'docker'
        uses: docker/setup-buildx-action@v3
        with:
          driver-opts: |
            image=moby/buildkit:buildx-stable-1
          install: true

      - name: Setup Docker layer caching
        if: matrix.validation_mode == 'all' || matrix.validation_mode == 'docker'
        uses: actions/cache@v4
        with:
          path: /tmp/.buildx-cache
          key: buildx-${{ runner.os }}-${{ github.sha }}
          restore-keys: |
            buildx-${{ runner.os }}-

      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            build-essential \
            pkg-config \
            libssl-dev \
            libpq-dev \
            protobuf-compiler

      - name: Build foxhunt-validator
        run: |
          cd tools/foxhunt-validator
          cargo build --release
          echo "$(pwd)/target/release" >> $GITHUB_PATH

      - name: Run comprehensive validation
        id: validation
        env:
          CONTINUE_ON_ERROR: ${{ github.event.inputs.continue_on_error || 'false' }}
          SKIP_DOCKER: ${{ github.event.inputs.skip_docker || 'false' }}
          VALIDATION_MODE: ${{ matrix.validation_mode }}
        run: |
          cd tools/foxhunt-validator

          # Prepare validation arguments
          ARGS=""
          if [ "$CONTINUE_ON_ERROR" = "true" ]; then
            ARGS="$ARGS --continue-on-error"
          fi
          
          if [ "$SKIP_DOCKER" = "true" ]; then
            ARGS="$ARGS --skip-docker"
          fi

          # Run validation with appropriate mode
          case "$VALIDATION_MODE" in
            "all")
              cargo run --release -- all $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            "libs")
              cargo run --release -- libs $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            "bins")
              cargo run --release -- bins $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            "tests")
              cargo run --release -- tests $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            "examples")
              cargo run --release -- examples $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            "docker")
              cargo run --release -- docker $ARGS --format json --output /tmp/validation-report.json --verbose
              ;;
            *)
              echo "Unknown validation mode: $VALIDATION_MODE"
              exit 1
              ;;
          esac

      - name: Generate HTML report
        if: always()
        run: |
          cd tools/foxhunt-validator
          if [ -f /tmp/validation-report.json ]; then
            # Convert JSON report to HTML for better GitHub display
            cargo run --release -- analyze --format html --output /tmp/validation-report.html
          fi

      - name: Upload validation report
        if: always()
        uses: actions/upload-artifact@v4
        with:
          name: validation-report-${{ matrix.validation_mode }}-${{ github.run_number }}
          path: |
            /tmp/validation-report.json
            /tmp/validation-report.html
          retention-days: 30

      - name: Process validation results
        if: always()
        id: results
        run: |
          if [ -f /tmp/validation-report.json ]; then
            # Extract key metrics from JSON report
            SUCCESS_RATE=$(jq -r '.summary.success_rate' /tmp/validation-report.json)
            FAILED_COUNT=$(jq -r '.summary.failed' /tmp/validation-report.json)
            TIMEOUT_COUNT=$(jq -r '.summary.timed_out' /tmp/validation-report.json)
            TOTAL_TARGETS=$(jq -r '.summary.total_targets' /tmp/validation-report.json)
            
            echo "success_rate=$SUCCESS_RATE" >> $GITHUB_OUTPUT
            echo "failed_count=$FAILED_COUNT" >> $GITHUB_OUTPUT
            echo "timeout_count=$TIMEOUT_COUNT" >> $GITHUB_OUTPUT
            echo "total_targets=$TOTAL_TARGETS" >> $GITHUB_OUTPUT
            
            # Determine if validation was successful
            if [ "$FAILED_COUNT" -eq 0 ] && [ "$TIMEOUT_COUNT" -eq 0 ]; then
              echo "validation_success=true" >> $GITHUB_OUTPUT
            else
              echo "validation_success=false" >> $GITHUB_OUTPUT
            fi
          else
            echo "validation_success=false" >> $GITHUB_OUTPUT
            echo "No validation report found"
          fi

      - name: Comment on PR
        if: github.event_name == 'pull_request' && always()
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            
            let reportContent = "## 🦊 Foxhunt E2E Compilation Validation Report\n\n";
            
            if (fs.existsSync('/tmp/validation-report.json')) {
              const report = JSON.parse(fs.readFileSync('/tmp/validation-report.json', 'utf8'));
              
              const successRate = report.summary.success_rate;
              const statusEmoji = successRate === 100 ? "✅" : successRate >= 95 ? "⚠️" : "❌";
              
              reportContent += `${statusEmoji} **Overall Status**: ${successRate.toFixed(1)}% success rate\n\n`;
              reportContent += `📊 **Summary**:\n`;
              reportContent += `- Total Targets: ${report.summary.total_targets}\n`;
              reportContent += `- ✅ Successful: ${report.summary.successful}\n`;
              reportContent += `- ❌ Failed: ${report.summary.failed}\n`;
              reportContent += `- ⏰ Timed Out: ${report.summary.timed_out}\n`;
              reportContent += `- ⏭️ Skipped: ${report.summary.skipped}\n\n`;
              
              reportContent += `📁 **Category Breakdown**:\n`;
              reportContent += `- 📚 Libraries: ${report.categories.libraries.success_rate.toFixed(1)}% (${report.categories.libraries.successful}/${report.categories.libraries.total})\n`;
              reportContent += `- ⚡ Binaries: ${report.categories.binaries.success_rate.toFixed(1)}% (${report.categories.binaries.successful}/${report.categories.binaries.total})\n`;
              reportContent += `- 🧪 Tests: ${report.categories.tests.success_rate.toFixed(1)}% (${report.categories.tests.successful}/${report.categories.tests.total})\n`;
              reportContent += `- 📋 Examples: ${report.categories.examples.success_rate.toFixed(1)}% (${report.categories.examples.successful}/${report.categories.examples.total})\n`;
              reportContent += `- 🐳 Docker: ${report.categories.docker.success_rate.toFixed(1)}% (${report.categories.docker.successful}/${report.categories.docker.total})\n\n`;
              
              if (report.summary.failed > 0 || report.summary.timed_out > 0) {
                reportContent += `❌ **Failures Detected** - Check the [detailed report](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }}) for more information.\n\n`;
              }
              
              reportContent += `⏱️ **Performance**: Total validation time ${(report.total_duration / 1000000000).toFixed(2)}s\n\n`;
            } else {
              reportContent += "❌ **Validation Failed** - No report generated. Check the workflow logs for details.\n\n";
            }
            
            reportContent += `🔗 **Full Report**: [View detailed validation report](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})\n`;
            reportContent += `📊 **Validation Mode**: ${{ matrix.validation_mode }}\n`;
            reportContent += `🤖 **Generated by**: Foxhunt Validator v0.1.0`;
            
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: reportContent
            });

      - name: Set job status based on validation results
        if: always()
        run: |
          if [ "${{ steps.results.outputs.validation_success }}" = "false" ]; then
            echo "❌ Validation failed - some targets did not compile successfully"
            exit 1
          else
            echo "✅ All validations passed successfully"
          fi

      - name: Print sccache stats
        if: always()
        run: sccache --show-stats

  validation-summary:
    name: Validation Summary
    runs-on: ubuntu-latest
    needs: [setup, validate-compilation]
    if: always()
    
    steps:
      - name: Download all validation reports
        uses: actions/download-artifact@v4
        with:
          path: reports/

      - name: Create consolidated summary
        run: |
          echo "## 🦊 Foxhunt E2E Compilation Validation Summary" >> $GITHUB_STEP_SUMMARY
          echo "### Validation Results" >> $GITHUB_STEP_SUMMARY
          
          for report_dir in reports/*/; do
            if [ -f "$report_dir/validation-report.json" ]; then
              MODE=$(basename "$report_dir" | sed 's/validation-report-\(.*\)-[0-9]*/\1/')
              SUCCESS_RATE=$(jq -r '.summary.success_rate' "$report_dir/validation-report.json")
              TOTAL=$(jq -r '.summary.total_targets' "$report_dir/validation-report.json")
              FAILED=$(jq -r '.summary.failed' "$report_dir/validation-report.json")
              
              if [ "$FAILED" -eq 0 ]; then
                echo "- ✅ **$MODE**: $SUCCESS_RATE% ($TOTAL targets)" >> $GITHUB_STEP_SUMMARY
              else
                echo "- ❌ **$MODE**: $SUCCESS_RATE% ($FAILED failures out of $TOTAL targets)" >> $GITHUB_STEP_SUMMARY
              fi
            fi
          done
          
          echo "### 📊 Artifacts" >> $GITHUB_STEP_SUMMARY
          echo "- Detailed JSON and HTML reports available in workflow artifacts" >> $GITHUB_STEP_SUMMARY
          echo "- Reports retained for 30 days" >> $GITHUB_STEP_SUMMARY

  notify-failure:
    name: Notify on Failure
    runs-on: ubuntu-latest
    needs: [validate-compilation]
    if: failure() && (github.ref == 'refs/heads/main' || github.ref == 'refs/heads/develop')
    
    steps:
      - name: Notify team of compilation failures
        uses: actions/github-script@v7
        with:
          script: |
            const issue_title = `🚨 E2E Compilation Validation Failures on ${context.ref.replace('refs/heads/', '')}`;
            const issue_body = `
            ## Compilation Validation Failures Detected
            
            **Branch**: \`${context.ref.replace('refs/heads/', '')}\`
            **Commit**: ${context.sha}
            **Workflow Run**: https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}
            
            ### ⚠️ Action Required
            Some targets in the workspace are failing to compile. This needs immediate attention to prevent blocking development.
            
            ### 🔍 Investigation Steps
            1. Check the [workflow logs](https://github.com/${context.repo.owner}/${context.repo.repo}/actions/runs/${context.runId}) for detailed error information
            2. Download the validation reports from the workflow artifacts
            3. Fix compilation issues in failing targets
            4. Ensure all tests pass locally before pushing
            
            ### 📋 Checklist
            - [ ] Review compilation errors in workflow logs
            - [ ] Fix failing library crates
            - [ ] Fix failing binary services  
            - [ ] Fix failing tests
            - [ ] Fix failing examples
            - [ ] Fix failing Docker builds
            - [ ] Verify all validations pass locally
            - [ ] Push fix and verify CI passes
            - [ ] Close this issue
            
            ---
            🤖 *This issue was automatically created by the E2E Compilation Validation workflow*
            `;
            
            // Check if an issue already exists for this branch
            const existingIssues = await github.rest.issues.listForRepo({
              owner: context.repo.owner,
              repo: context.repo.repo,
              state: 'open',
              labels: 'compilation-failure,automated'
            });
            
            const existingIssue = existingIssues.data.find(issue => 
              issue.title.includes(context.ref.replace('refs/heads/', ''))
            );
            
            if (!existingIssue) {
              await github.rest.issues.create({
                owner: context.repo.owner,
                repo: context.repo.repo,
                title: issue_title,
                body: issue_body,
                labels: ['compilation-failure', 'automated', 'priority-high']
              });
            }