name: 'Setup Flutter'
description: 'Cross-platform setup for Flutter with caching on macOS, Windows, and Linux.'
inputs:
  version:
    description: 'Flutter channel or version tag (e.g., master, stable, 3.29.0)'
    required: false
    default: 'master'
  mirror_url:
    description: 'Git repository URL for Flutter SDK'
    required: false
    default: 'https://git.rodydavis.dev/rodydavis/flutter.git'
  git_token:
    description: 'Gitea token for authenticated git cloning'
    required: false
    default: ''
  cache:
    description: 'Enable Flutter SDK caching'
    required: false
    default: 'true'
  enable_windowing:
    description: 'Enable windowing and desktop support'
    required: false
    default: 'true'

runs:
  using: 'composite'
  steps:
    - name: Determine Cache Key
      id: cache-key
      shell: bash
      run: |
        echo "key=flutter-${{ runner.os }}-${{ runner.arch }}-${{ inputs.version }}" >> $GITHUB_OUTPUT

    - name: Cache Flutter SDK
      if: inputs.cache == 'true'
      id: flutter-cache
      uses: actions/cache@v3
      with:
        path: |
          ~/flutter-sdk
          C:\flutter-sdk
        key: ${{ steps.cache-key.outputs.key }}

    - name: Install Flutter (macOS / Linux)
      if: runner.os != 'Windows' && steps.flutter-cache.outputs.cache-hit != 'true'
      shell: bash
      run: |
        LOCK_DIR="${TMPDIR:-/tmp}/flutter-sdk-setup.lock"
        for i in {1..60}; do
          if mkdir "$LOCK_DIR" 2>/dev/null; then
            break
          fi
          echo "Waiting for concurrent Flutter setup lock ($i/60)..."
          sleep 2
        done

        SDK_DIR="$HOME/flutter-sdk"
        CLONE_URL="${{ inputs.mirror_url }}"
        if [ -n "${{ inputs.git_token }}" ] && [[ "$CLONE_URL" == https://* ]]; then
          CLONE_URL="https://git:${{ inputs.git_token }}@${CLONE_URL#https://}"
        fi

        if [ ! -d "$SDK_DIR/.git" ] || [ ! -f "$SDK_DIR/bin/flutter" ]; then
          echo "Cloning Flutter ${{ inputs.version }} from $CLONE_URL to $SDK_DIR..."
          rm -rf "$SDK_DIR"
          git clone --depth 1 --branch ${{ inputs.version }} "$CLONE_URL" "$SDK_DIR" || {
            echo "Failed to clone from mirror, falling back to GitHub..."
            git clone --depth 1 --branch ${{ inputs.version }} https://github.com/flutter/flutter.git "$SDK_DIR"
          }
        else
          echo "Flutter SDK already present at $SDK_DIR. Ready to use."
        fi

        rm -rf "$LOCK_DIR" || true

    - name: Install Flutter (Windows)
      if: runner.os == 'Windows' && steps.flutter-cache.outputs.cache-hit != 'true'
      shell: powershell
      run: |
        $lockDir = Join-Path $env:TEMP "flutter-sdk-setup.lock"
        $waited = 0
        while ($true) {
          try {
            [System.IO.Directory]::CreateDirectory($lockDir) | Out-Null
            break
          } catch {
            Start-Sleep -Seconds 2
            $waited += 2
            if ($waited -ge 120) { break }
          }
        }

        $sdkDir = "C:\flutter-sdk"
        $cloneUrl = "${{ inputs.mirror_url }}"
        if ("${{ inputs.git_token }}" -ne "" -and $cloneUrl.StartsWith("https://")) {
          $cloneUrl = "https://git:${{ inputs.git_token }}@" + $cloneUrl.Substring(8)
        }

        if (-not (Test-Path "$sdkDir\bin\flutter.bat")) {
          echo "Cloning Flutter ${{ inputs.version }} from $cloneUrl to $sdkDir..."
          try {
            git clone --depth 1 --branch ${{ inputs.version }} $cloneUrl $sdkDir
          } catch {
            echo "Failed to clone from mirror, falling back to GitHub..."
            git clone --depth 1 --branch ${{ inputs.version }} https://github.com/flutter/flutter.git $sdkDir
          }
        } else {
          echo "Flutter SDK already present at $sdkDir. Ready to use."
        }

        if (Test-Path $lockDir) {
          try { [System.IO.Directory]::Delete($lockDir, $true) } catch {}
        }

    - name: Add to PATH and Configure (macOS / Linux)
      if: runner.os != 'Windows'
      shell: bash
      run: |
        SDK_DIR="$HOME/flutter-sdk"
        export PATH="$SDK_DIR/bin:$PATH"
        echo "$SDK_DIR/bin" >> $GITHUB_PATH

        if [ "${{ inputs.enable_windowing }}" = "true" ]; then
          "$SDK_DIR/bin/flutter" config --enable-windowing
        fi
        "$SDK_DIR/bin/flutter" --version

    - name: Add to PATH and Configure (Windows)
      if: runner.os == 'Windows'
      shell: powershell
      run: |
        $sdkDir = "C:\flutter-sdk"
        [System.IO.File]::AppendAllText($env:GITHUB_PATH, "$sdkDir\bin`r`n")
        $env:PATH = "$sdkDir\bin;$env:PATH"

        if ("${{ inputs.enable_windowing }}" -eq "true") {
          & "$sdkDir\bin\flutter.bat" config --enable-windowing
        }
        & "$sdkDir\bin\flutter.bat" --version