name: "Setup Bun"
description: "Setup Bun with caching and install dependencies"
inputs:
  cross-compile:
    description: "Pre-cache canary cross-compile binaries for all targets"
    required: false
    default: "false"
runs:
  using: "composite"
  steps:
    - name: Cache Bun dependencies
      uses: actions/cache@v4
      with:
        path: ~/.bun/install/cache
        key: ${{ runner.os }}-bun-${{ hashFiles('**/bun.lockb') }}
        restore-keys: |
          ${{ runner.os }}-bun-

    - name: Get baseline download URL
      id: bun-url
      shell: bash
      run: |
        if [ "$RUNNER_ARCH" = "X64" ]; then
          case "$RUNNER_OS" in
            macOS)   OS=darwin ;;
            Linux)   OS=linux ;;
            Windows) OS=windows ;;
          esac
          echo "url=https://github.com/oven-sh/bun/releases/download/canary/bun-${OS}-x64-baseline.zip" >> "$GITHUB_OUTPUT"
        fi

    - name: Setup Bun
      uses: oven-sh/setup-bun@v2
      with:
        bun-version-file: ${{ !steps.bun-url.outputs.url && 'package.json' || '' }}
        bun-download-url: ${{ steps.bun-url.outputs.url }}

    - name: Pre-cache canary cross-compile binaries
      if: inputs.cross-compile == 'true'
      shell: bash
      run: |
        BUN_VERSION=$(bun --revision)
        if echo "$BUN_VERSION" | grep -q "canary"; then
          SEMVER=$(echo "$BUN_VERSION" | sed 's/^\([0-9]*\.[0-9]*\.[0-9]*\).*/\1/')
          echo "Bun version: $BUN_VERSION (semver: $SEMVER)"
          CACHE_DIR="$HOME/.bun/install/cache"
          mkdir -p "$CACHE_DIR"
          TMP_DIR=$(mktemp -d)
          for TARGET in linux-aarch64 linux-x64 linux-x64-baseline linux-aarch64-musl linux-x64-musl linux-x64-musl-baseline darwin-aarch64 darwin-x64 windows-x64 windows-x64-baseline; do
            DEST="$CACHE_DIR/bun-${TARGET}-v${SEMVER}"
            if [ -f "$DEST" ]; then
              echo "Already cached: $DEST"
              continue
            fi
            URL="https://github.com/oven-sh/bun/releases/download/canary/bun-${TARGET}.zip"
            echo "Downloading $TARGET from $URL"
            if curl -sfL -o "$TMP_DIR/bun.zip" "$URL"; then
              unzip -qo "$TMP_DIR/bun.zip" -d "$TMP_DIR"
              if echo "$TARGET" | grep -q "windows"; then
                BIN_NAME="bun.exe"
              else
                BIN_NAME="bun"
              fi
              mv "$TMP_DIR/bun-${TARGET}/$BIN_NAME" "$DEST"
              chmod +x "$DEST"
              rm -rf "$TMP_DIR/bun-${TARGET}" "$TMP_DIR/bun.zip"
              echo "Cached: $DEST"
              # baseline bun resolves "bun-darwin-x64" to the baseline cache key
              # so copy the modern binary there too
              if [ "$TARGET" = "darwin-x64" ]; then
                BASELINE_DEST="$CACHE_DIR/bun-darwin-x64-baseline-v${SEMVER}"
                if [ ! -f "$BASELINE_DEST" ]; then
                  cp "$DEST" "$BASELINE_DEST"
                  echo "Cached (baseline alias): $BASELINE_DEST"
                fi
              fi
            else
              echo "Skipped: $TARGET (not available)"
            fi
          done
          rm -rf "$TMP_DIR"
        else
          echo "Not a canary build ($BUN_VERSION), skipping pre-cache"
        fi

    - name: Install dependencies
      run: bun install
      shell: bash