name: cross-platform-determinism
on:
  workflow_dispatch: {}
  push:
    branches: [main]
    paths:
      - 'src/__Libraries/StellaOps.Canonical.Json/**'
      - 'src/__Libraries/StellaOps.Replay.Core/**'
      - 'src/__Tests/**Determinism**'
      - '.gitea/workflows/cross-platform-determinism.yml'
  pull_request:
    branches: [main]
    paths:
      - 'src/__Libraries/StellaOps.Canonical.Json/**'
      - 'src/__Libraries/StellaOps.Replay.Core/**'
      - 'src/__Tests/**Determinism**'

jobs:
  # DET-GAP-11: Windows determinism test runner
  determinism-windows:
    runs-on: windows-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup .NET
        uses: actions/setup-dotnet@v4
        with:
          dotnet-version: "10.0.100"

      - name: Restore dependencies
        run: dotnet restore src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj

      - name: Run determinism property tests
        run: |
          dotnet test src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj `
            --logger "trx;LogFileName=determinism-windows.trx" `
            --results-directory ./test-results/windows

      - name: Generate hash report
        shell: pwsh
        run: |
          # Generate determinism baseline hashes
          $hashReport = @{
            platform = "windows"
            timestamp = (Get-Date -Format "o")
            hashes = @{}
          }

          # Run hash generation script
          dotnet run --project tools/determinism-hash-generator -- `
            --output ./test-results/windows/hashes.json

          # Upload for comparison
          Copy-Item ./test-results/windows/hashes.json ./test-results/windows-hashes.json

      - name: Upload Windows results
        uses: actions/upload-artifact@v4
        with:
          name: determinism-windows
          path: |
            ./test-results/windows/
            ./test-results/windows-hashes.json

  # DET-GAP-12: macOS determinism test runner
  determinism-macos:
    runs-on: macos-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup .NET
        uses: actions/setup-dotnet@v4
        with:
          dotnet-version: "10.0.100"

      - name: Restore dependencies
        run: dotnet restore src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj

      - name: Run determinism property tests
        run: |
          dotnet test src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj \
            --logger "trx;LogFileName=determinism-macos.trx" \
            --results-directory ./test-results/macos

      - name: Generate hash report
        run: |
          # Generate determinism baseline hashes
          dotnet run --project tools/determinism-hash-generator -- \
            --output ./test-results/macos/hashes.json

          cp ./test-results/macos/hashes.json ./test-results/macos-hashes.json

      - name: Upload macOS results
        uses: actions/upload-artifact@v4
        with:
          name: determinism-macos
          path: |
            ./test-results/macos/
            ./test-results/macos-hashes.json

  # Linux runner (baseline)
  determinism-linux:
    runs-on: ubuntu-latest
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Setup .NET
        uses: actions/setup-dotnet@v4
        with:
          dotnet-version: "10.0.100"

      - name: Restore dependencies
        run: dotnet restore src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj

      - name: Run determinism property tests
        run: |
          dotnet test src/__Tests/__Libraries/StellaOps.Testing.Determinism.Properties/StellaOps.Testing.Determinism.Properties.csproj \
            --logger "trx;LogFileName=determinism-linux.trx" \
            --results-directory ./test-results/linux

      - name: Generate hash report
        run: |
          # Generate determinism baseline hashes
          dotnet run --project tools/determinism-hash-generator -- \
            --output ./test-results/linux/hashes.json

          cp ./test-results/linux/hashes.json ./test-results/linux-hashes.json

      - name: Upload Linux results
        uses: actions/upload-artifact@v4
        with:
          name: determinism-linux
          path: |
            ./test-results/linux/
            ./test-results/linux-hashes.json

  # DET-GAP-13: Cross-platform hash comparison report
  compare-hashes:
    runs-on: ubuntu-latest
    needs: [determinism-windows, determinism-macos, determinism-linux]
    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Download all artifacts
        uses: actions/download-artifact@v4
        with:
          path: ./artifacts

      - name: Setup Python
        uses: actions/setup-python@v5
        with:
          python-version: '3.12'

      - name: Generate comparison report
        run: |
          python3 scripts/determinism/compare-platform-hashes.py \
            --linux ./artifacts/determinism-linux/linux-hashes.json \
            --windows ./artifacts/determinism-windows/windows-hashes.json \
            --macos ./artifacts/determinism-macos/macos-hashes.json \
            --output ./cross-platform-report.json \
            --markdown ./cross-platform-report.md

      - name: Check for divergences
        run: |
          # Fail if any hashes differ across platforms
          python3 -c "
          import json
          import sys

          with open('./cross-platform-report.json') as f:
              report = json.load(f)

          divergences = report.get('divergences', [])
          if divergences:
              print(f'ERROR: {len(divergences)} hash divergence(s) detected!')
              for d in divergences:
                  print(f'  - {d[\"key\"]}: linux={d[\"linux\"]}, windows={d[\"windows\"]}, macos={d[\"macos\"]}')
              sys.exit(1)
          else:
              print('SUCCESS: All hashes match across platforms.')
          "

      - name: Upload comparison report
        uses: actions/upload-artifact@v4
        with:
          name: cross-platform-comparison
          path: |
            ./cross-platform-report.json
            ./cross-platform-report.md

      - name: Comment on PR (if applicable)
        if: github.event_name == 'pull_request'
        uses: actions/github-script@v7
        with:
          script: |
            const fs = require('fs');
            const report = fs.readFileSync('./cross-platform-report.md', 'utf8');
            github.rest.issues.createComment({
              issue_number: context.issue.number,
              owner: context.repo.owner,
              repo: context.repo.repo,
              body: '## Cross-Platform Determinism Report\n\n' + report
            });