# Automated Code Coverage Enforcement for Foxhunt HFT System
# TDD-compliant coverage tracking with 60% minimum, 75% target

name: Code Coverage

on:
  push:
    branches: [ main, master, develop ]
  pull_request:
    branches: [ main, master, develop ]
  schedule:
    # Run coverage analysis daily at 3 AM UTC
    - cron: '0 3 * * *'

env:
  CARGO_TERM_COLOR: always
  RUSTFLAGS: "-C instrument-coverage"
  LLVM_PROFILE_FILE: "foxhunt-%p-%m.profraw"
  MIN_COVERAGE: 60
  TARGET_COVERAGE: 75

jobs:
  coverage:
    name: Coverage Enforcement
    runs-on: ubuntu-latest

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          components: llvm-tools-preview

      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov

      - name: Cache Rust dependencies
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target/
          key: ${{ runner.os }}-cargo-coverage-${{ hashFiles('**/Cargo.lock') }}
          restore-keys: |
            ${{ runner.os }}-cargo-coverage-
            ${{ runner.os }}-cargo-

      - name: Install system dependencies
        run: |
          sudo apt-get update
          sudo apt-get install -y \
            build-essential \
            pkg-config \
            libssl-dev \
            postgresql-client \
            bc \
            jq

      - name: Run coverage enforcement script
        id: coverage
        run: |
          ./scripts/enforce_coverage.sh || echo "COVERAGE_FAILED=true" >> $GITHUB_ENV

          # Extract coverage percentage for outputs
          if [ -f coverage_report.json ]; then
            COVERAGE_PERCENT=$(jq -r '.data[0].totals.lines.percent' coverage_report.json 2>/dev/null || echo "0")
          else
            COVERAGE_PERCENT=$(grep -o 'Overall Coverage: [0-9.]*%' coverage_summary.md | grep -o '[0-9.]*' || echo "0")
          fi

          echo "COVERAGE_PERCENT=$COVERAGE_PERCENT" >> $GITHUB_ENV
          echo "coverage=$COVERAGE_PERCENT" >> $GITHUB_OUTPUT

      - name: Upload HTML coverage report
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: html-coverage-report
          path: coverage_artifacts/coverage_html/
          retention-days: 30

      - name: Upload LCOV report
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: lcov-report
          path: coverage_artifacts/lcov.info
          retention-days: 30

      - name: Upload JSON reports
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: json-reports
          path: |
            coverage_artifacts/coverage_report.json
            coverage_artifacts/module_coverage.json
          retention-days: 30

      - name: Upload coverage summary
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: coverage-summary
          path: coverage_artifacts/coverage_summary.md
          retention-days: 7

      - name: Generate coverage badge
        if: always()
        run: |
          COVERAGE_PERCENT="${{ env.COVERAGE_PERCENT }}"

          if (( $(echo "$COVERAGE_PERCENT >= 75" | bc -l) )); then
            BADGE_COLOR="brightgreen"
          elif (( $(echo "$COVERAGE_PERCENT >= 60" | bc -l) )); then
            BADGE_COLOR="yellow"
          else
            BADGE_COLOR="red"
          fi

          echo "BADGE_COLOR=$BADGE_COLOR" >> $GITHUB_ENV

          # Update coverage badge in README
          BADGE_URL="https://img.shields.io/badge/coverage-${COVERAGE_PERCENT}%25-${BADGE_COLOR}"
          echo "![Coverage]($BADGE_URL)" > coverage_badge.md

      - name: Comment PR with coverage
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');

            try {
              const summary = fs.readFileSync('coverage_artifacts/coverage_summary.md', 'utf8');

              // Add comparison with base branch if available
              let comment = summary + '\n\n---\n';
              comment += `\n**Coverage Delta**: Compare with base branch to see coverage changes\n`;
              comment += `\n[📊 View Full HTML Report](https://github.com/${{ github.repository }}/actions/runs/${{ github.run_id }})\n`;

              github.rest.issues.createComment({
                issue_number: context.issue.number,
                owner: context.repo.owner,
                repo: context.repo.repo,
                body: comment
              });
            } catch (error) {
              console.error('Failed to post coverage comment:', error);
            }

      - name: Post coverage to job summary
        if: always()
        run: |
          if [ -f coverage_artifacts/coverage_summary.md ]; then
            cat coverage_artifacts/coverage_summary.md >> $GITHUB_STEP_SUMMARY
          fi

      - name: Check coverage threshold
        if: always()
        run: |
          COVERAGE_PERCENT="${{ env.COVERAGE_PERCENT }}"
          MIN_COVERAGE="${{ env.MIN_COVERAGE }}"

          if (( $(echo "$COVERAGE_PERCENT < $MIN_COVERAGE" | bc -l) )); then
            echo "❌ Coverage $COVERAGE_PERCENT% is below the required $MIN_COVERAGE% threshold"
            exit 1
          else
            echo "✅ Coverage $COVERAGE_PERCENT% meets the required $MIN_COVERAGE% threshold"
          fi

  # Per-module coverage analysis
  module-coverage:
    name: Module Coverage Analysis
    runs-on: ubuntu-latest
    continue-on-error: true

    strategy:
      matrix:
        component:
          - name: "trading_engine"
            packages: "trading_engine"
            target: 75
          - name: "risk"
            packages: "risk"
            target: 75
          - name: "api_gateway"
            packages: "services/api_gateway"
            target: 75
          - name: "trading_service"
            packages: "services/trading_service"
            target: 75
          - name: "config"
            packages: "config"
            target: 75
          - name: "common"
            packages: "common"
            target: 75
          - name: "backtesting"
            packages: "backtesting"
            target: 60
          - name: "ml"
            packages: "ml"
            target: 60
          - name: "data"
            packages: "data"
            target: 60

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

      - name: Install Rust toolchain
        uses: dtolnay/rust-toolchain@stable
        with:
          components: llvm-tools-preview

      - name: Install cargo-llvm-cov
        uses: taiki-e/install-action@cargo-llvm-cov

      - name: Cache dependencies
        uses: actions/cache@v4
        with:
          path: |
            ~/.cargo/registry
            ~/.cargo/git
            target/
          key: ${{ runner.os }}-module-${{ matrix.component.name }}-${{ hashFiles('**/Cargo.lock') }}

      - name: Run component coverage
        continue-on-error: true
        run: |
          # Handle path-based packages
          if [[ "${{ matrix.component.packages }}" == *"/"* ]]; then
            # For services, navigate to directory
            PKG_PATH="${{ matrix.component.packages }}"
            cargo llvm-cov \
              --manifest-path "$PKG_PATH/Cargo.toml" \
              --all-features \
              --lcov --output-path ${{ matrix.component.name }}.lcov \
              --html --output-dir coverage_${{ matrix.component.name }} || true
          else
            # For workspace members
            cargo llvm-cov \
              --package ${{ matrix.component.packages }} \
              --all-features \
              --lcov --output-path ${{ matrix.component.name }}.lcov \
              --html --output-dir coverage_${{ matrix.component.name }} || true
          fi

      - name: Upload component coverage
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: coverage-${{ matrix.component.name }}
          path: |
            ${{ matrix.component.name }}.lcov
            coverage_${{ matrix.component.name }}/
          retention-days: 14

  # Coverage trend analysis for main branch
  coverage-trends:
    name: Coverage Trend Analysis
    runs-on: ubuntu-latest
    needs: [coverage]
    if: github.ref == 'refs/heads/main' || github.ref == 'refs/heads/master'

    steps:
      - name: Checkout repository
        uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Download coverage reports
        uses: actions/download-artifact@v4
        with:
          name: lcov-report

      - name: Store coverage history
        run: |
          # Create coverage history directory
          mkdir -p .coverage-history

          # Extract coverage percentage from LCOV
          if [ -f lcov.info ]; then
            LINES_FOUND=$(grep -o 'LF:[0-9]*' lcov.info | cut -d: -f2 | paste -sd+ | bc)
            LINES_HIT=$(grep -o 'LH:[0-9]*' lcov.info | cut -d: -f2 | paste -sd+ | bc)
            COVERAGE_PERCENT=$(echo "scale=2; ($LINES_HIT * 100) / $LINES_FOUND" | bc)

            # Store in history file
            echo "$(date -Iseconds),$COVERAGE_PERCENT,${{ github.sha }}" >> .coverage-history/coverage.csv

            # Keep only last 100 entries
            if [ -f .coverage-history/coverage.csv ]; then
              tail -100 .coverage-history/coverage.csv > .coverage-history/coverage.csv.tmp
              mv .coverage-history/coverage.csv.tmp .coverage-history/coverage.csv
            fi
          fi

      - name: Generate trend chart
        run: |
          # Generate simple ASCII chart of coverage trends
          if [ -f .coverage-history/coverage.csv ]; then
            echo "## Coverage Trend (Last 10 commits)" > coverage_trend.md
            echo "\`\`\`" >> coverage_trend.md
            tail -10 .coverage-history/coverage.csv | while IFS=, read -r date coverage commit; do
              echo "$date: $coverage% (${commit:0:7})" >> coverage_trend.md
            done
            echo "\`\`\`" >> coverage_trend.md

            cat coverage_trend.md >> $GITHUB_STEP_SUMMARY
          fi

      - name: Commit coverage history
        run: |
          git config --local user.email "github-actions[bot]@users.noreply.github.com"
          git config --local user.name "github-actions[bot]"
          git add .coverage-history/
          git diff --staged --quiet || git commit -m "Update coverage history [skip ci]"
          git push || echo "No changes to push"