name: 'Download Kernel Repository'
description: 'Initialize and sync Android kernel source repository'

inputs:
  android_version:
    description: 'Android version (e.g., android14)'
    required: true
  kernel_version:
    description: 'Kernel version (e.g., 5.15, 6.1)'
    required: true
  version:
    description: 'Combined version (e.g., android14-6.1)'
    required: true
  os_patch_level:
    description: 'OS patch level (e.g., 2024-01)'
    required: true

outputs:
  deprecated_branch:
    description: 'Whether the branch is deprecated'
    value: ${{ steps.sync.outputs.deprecated }}

runs:
  using: composite
  steps:
    - name: Initialize and Sync Kernel Repository
      id: sync
      shell: bash
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail

        # Derive android and kernel from combined version when available
        VERSION="${{ inputs.version }}"
        ANDROID_PART=$(echo "$VERSION" | cut -d- -f1)
        KERNEL_PART=$(echo "$VERSION" | cut -d- -f2)
        FORMATTED_BRANCH="${ANDROID_PART}-${KERNEL_PART}-${{ inputs.os_patch_level }}"

        init_repo() {
          local depth="$1"
          local depth_flag=""
          if [ "$depth" != "0" ]; then
            depth_flag="--depth=${depth}"
          fi
          repo init -u https://android.googlesource.com/kernel/manifest -b common-${FORMATTED_BRANCH} ${depth_flag} || { echo "ERROR: repo init failed" >&2; return 1; }
          REMOTE_BRANCH=$(git ls-remote https://android.googlesource.com/kernel/common ${FORMATTED_BRANCH}) || { echo "ERROR: git ls-remote failed" >&2; return 1; }
          DEFAULT_MANIFEST_PATH=.repo/manifests/default.xml
          DEPRECATED=false
          if grep -q deprecated <<< "$REMOTE_BRANCH"; then
            sed -i "s/\"${FORMATTED_BRANCH}\"/\"deprecated\/${FORMATTED_BRANCH}\"/g" "$DEFAULT_MANIFEST_PATH"
            echo "[!] Note: Branch ${FORMATTED_BRANCH} is considered deprecated."
            DEPRECATED=true
          fi
          echo "deprecated=$DEPRECATED" >> $GITHUB_OUTPUT
        }

        MAX_RETRIES=3
        RETRY_DELAY_SHORT=15
        SYNC_TIMEOUT="15m"
        attempt=1
        # Always shallow: the build only needs the branch tip. Deeper retries
        # just download more data into a strained runner (slower + more disk).
        DEPTHS=(1 1 1)

        clean_workspace() {
          echo "Disk before cleanup:"
          df -h "$PWD" | tail -n +2 || true
          # Remove repo metadata AND any half-checked-out project dirs from the
          # previous attempt. Deleting only .repo leaves stale checkouts behind
          # and every later sync fails with "Checking out local projects failed".
          find "$PWD" -mindepth 1 -maxdepth 1 -exec rm -rf {} +
          echo "Disk after cleanup:"
          df -h "$PWD" | tail -n +2 || true
        }

        while [ $attempt -le $MAX_RETRIES ]; do
          CURRENT_DEPTH="${DEPTHS[$((attempt-1))]}"
          echo "Attempt $attempt/$MAX_RETRIES: initialize and sync kernel repository (depth=${CURRENT_DEPTH}, sync timeout $SYNC_TIMEOUT)..."
          df -h "$PWD" | tail -n +2 || true
          if init_repo "$CURRENT_DEPTH"; then
            # Use minimal-shallow variant: current-branch, shallow init done above, reduce files downloaded
            if timeout $SYNC_TIMEOUT repo sync -c --current-branch --no-clone-bundle --no-tags --jobs-checkout=4 -j4; then
              echo "Kernel repository initialization and sync succeeded on attempt $attempt."
              break
            else
              rc=$?
              if [ $rc -eq 124 ]; then
                echo "repo sync timed out after $SYNC_TIMEOUT."
              else
                echo "repo sync failed with exit code $rc."
              fi
            fi
          else
            rc=$?
            echo "repo init or branch preflight failed with exit code $rc."
          fi

          if [ $attempt -lt $MAX_RETRIES ]; then
            echo "Cleaning workspace and retrying after ${RETRY_DELAY_SHORT}s..."
            clean_workspace || true
            sleep $RETRY_DELAY_SHORT
          else
            echo "All $MAX_RETRIES attempts failed." >&2
            exit $rc
          fi
          attempt=$((attempt+1))
        done

    # --- Non-repo steps (commented out; we only use repo now) ---
    # - name: Download manifest.xml for branch (with deprecated fallback)
    #   shell: bash
    #   working-directory: ${{ github.workspace }}/kernel
    #   run: |
    #     set -euo pipefail
    #     VERSION="${{ inputs.version }}"
    #     ANDROID_PART=$(echo "$VERSION" | cut -d- -f1)
    #     KERNEL_PART=$(echo "$VERSION" | cut -d- -f2)
    #     FORMATTED_BRANCH="${ANDROID_PART}-${KERNEL_PART}-${{ inputs.os_patch_level }}"
    #     MAIN_MANIFEST_URL="https://android.googlesource.com/kernel/manifest/+/refs/heads/common-${FORMATTED_BRANCH}/default.xml?format=TEXT"
    #     DEPRECATED_MANIFEST_URL="https://android.googlesource.com/kernel/manifest/+/refs/heads/deprecated/common-${FORMATTED_BRANCH}/default.xml?format=TEXT"
    #     echo "Trying to fetch manifest from $MAIN_MANIFEST_URL"
    #     if curl -fsSL "$MAIN_MANIFEST_URL" | base64 -d > manifest.xml; then
    #       echo "Fetched manifest from $MAIN_MANIFEST_URL"
    #     else
    #       echo "Main manifest fetch failed, trying deprecated branch."
    #       echo "[!] Note: Branch common-${FORMATTED_BRANCH} is considered deprecated."
    #       if curl -fsSL "$DEPRECATED_MANIFEST_URL" | base64 -d > manifest.xml; then
    #         echo "Fetched manifest from $DEPRECATED_MANIFEST_URL"
    #       else
    #         echo "ERROR: Neither main nor deprecated branch exists for $FORMATTED_BRANCH" >&2
    #         exit 22
    #       fi
    #     fi
    #
    # - name: Debug Show manifest.xml
    #   shell: bash
    #   working-directory: ${{ github.workspace }}/kernel
    #   run: cat manifest.xml
    #
    # - name: Fast Parallel Archive Download
    #   shell: bash
    #   working-directory: ${{ github.workspace }}/kernel
    #   run: |
    #     python "${{ github.workspace }}/.github/actions/download-kernel/fast_parallel_download.py"

    - name: Capture Kernel Common Commit Metadata
      shell: bash
      working-directory: ${{ github.workspace }}/kernel
      run: |
        set -euo pipefail

        if [[ ! -d common ]]; then
          echo "WARNING: common folder not found; skipping commit metadata capture."
          exit 0
        fi

        cd common

        if [[ ! -d .git ]]; then
          echo "WARNING: common is not a git checkout; skipping commit metadata capture."
          exit 0
        fi

        COMMIT_DATE=$(git log -1 --format=%cI)
        COMMIT_MSG=$(git log -1 --format=%s)
        COMMIT_SHA=$(git rev-parse HEAD)

        echo "KERNEL_SOURCE_COMMIT=$COMMIT_SHA" >> "$GITHUB_ENV"
        echo "Kernel common commit date: $COMMIT_DATE"
        echo "Kernel common commit msg: $COMMIT_MSG"
        echo "Kernel common commit SHA: $COMMIT_SHA"