name: FFmpeg Preflight and Build

on:
  push:
    branches: [ main, master ]
  pull_request:
    branches: [ main, master ]

jobs:
  preflight:
    runs-on: ${{ matrix.os }}
    strategy:
      matrix:
        os: [ubuntu-latest, windows-latest, macos-latest]

    env:
      # Provide a fallback URL via repository secret `FFMPEG_URL_{OS}` or `FFMPEG_URL`.
      FFMPEG_URL: ${{ secrets.FFMPEG_URL }}

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

      - name: Set up Node.js
        uses: actions/setup-node@v4
        with:
          node-version: '18'

      - name: Set up Rust
        uses: dtolnay/gh-actions-rs@stable

      - name: Determine OS-specific ffmpeg URL
        id: ffmpeg-url
        shell: bash
        run: |
          echo "RUNNER_OS=${RUNNER_OS}"
          if [[ "${RUNNER_OS}" == "Windows" ]]; then
            echo "url=${{ secrets.FFMPEG_URL_WINDOWS || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
          elif [[ "${RUNNER_OS}" == "macOS" ]]; then
            echo "url=${{ secrets.FFMPEG_URL_MACOS || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
          else
            echo "url=${{ secrets.FFMPEG_URL_LINUX || secrets.FFMPEG_URL }}" >> $GITHUB_OUTPUT
          fi

      - name: Create resources dir
        run: mkdir -p src-tauri/resources

      - name: Download and install FFmpeg into resources
        if: steps.ffmpeg-url.outputs.url != ''
        shell: bash
        run: |
          set -euo pipefail
          URL="${{ steps.ffmpeg-url.outputs.url }}"
          echo "Downloading ffmpeg from: $URL"
          FNAME="${RUNNER_TEMP}/ffmpeg_bundle"
          if [[ "${RUNNER_OS}" == "Windows" ]]; then
            powershell -Command "(New-Object Net.WebClient).DownloadFile('$URL', '$FNAME.zip')"
            powershell -Command "Expand-Archive -Path '$FNAME.zip' -DestinationPath '${{ github.workspace }}\\src-tauri\\resources'"
          else
            curl -sL "$URL" -o "$FNAME"
            # Attempt to extract common archive formats
            if file "$FNAME" | grep -q 'Zip archive'; then
              unzip -q "$FNAME" -d src-tauri/resources
            elif file "$FNAME" | grep -q 'gzip compressed data'; then
              tar -xzf "$FNAME" -C src-tauri/resources
            elif file "$FNAME" | grep -q 'XZ compressed'; then
              tar -xJf "$FNAME" -C src-tauri/resources
            else
              # Assume raw binary
              mv "$FNAME" src-tauri/resources/ffmpeg
              chmod +x src-tauri/resources/ffmpeg
            fi
          fi

      - name: List resources
        run: ls -la src-tauri/resources || true

      - name: Locate ffmpeg binary (Linux/macOS)
        if: runner.os != 'Windows'
        shell: bash
        run: |
          set -euo pipefail
          # Try to find an ffmpeg executable anywhere under resources
          BINPATH=$(find src-tauri/resources -type f -iname ffmpeg -print -quit || true)
          if [ -z "$BINPATH" ]; then
            BINPATH=$(find src-tauri/resources -type f -iname 'ffmpeg*' -print -quit || true)
          fi
          if [ -n "$BINPATH" ]; then
            echo "Found ffmpeg at $BINPATH"
            cp "$BINPATH" src-tauri/resources/ffmpeg
            chmod +x src-tauri/resources/ffmpeg
          else
            echo "ffmpeg binary not found in resources"
            ls -R src-tauri/resources || true
            exit 1
          fi

      - name: Locate ffmpeg binary (Windows)
        if: runner.os == 'Windows'
        shell: pwsh
        run: |
          $found = Get-ChildItem -Path src-tauri/resources -Recurse -Filter ffmpeg.exe -ErrorAction SilentlyContinue | Select-Object -First 1
          if (-not $found) {
            $found = Get-ChildItem -Path src-tauri/resources -Recurse -Filter '*ffmpeg*' -ErrorAction SilentlyContinue | Select-Object -First 1
          }
          if ($found) {
            Write-Host "Found ffmpeg at $($found.FullName)"
            Copy-Item $found.FullName -Destination 'src-tauri\resources\ffmpeg.exe' -Force
          } else {
            Write-Host "ffmpeg not found in src-tauri/resources"
            Get-ChildItem src-tauri\resources -Recurse | Format-List
            exit 1
          }

      - name: Install npm deps
        run: npm ci

      - name: Copy project FFmpeg helpers
        run: node tools/copy-ffmpeg.js || true

      - name: Build Rust and run ffmpeg preflight check
        working-directory: src-tauri
        run: |
          set -e
          cargo build --release
          cargo run --release --bin check_ffmpeg

      - name: Optional frontend build
        run: npm run build --if-present || true