name: 'Setup Build Environment'
description: 'Clones dependencies and exports mkbootimg/avbtool paths'

inputs:
  version:
    description: 'Kernel config version (e.g., android12-5.10)'
    required: true
  sublevel:
    description: 'Kernel sublevel'
    required: true
  kernel_patches_commit:
    description: 'Pinned kernel_patches commit (empty = main tip)'
    required: false
    default: ''
  anykernel3_commit:
    description: 'Pinned AnyKernel3 commit (empty = gki-2.0 tip)'
    required: false
    default: ''

runs:
  using: composite
  steps:
    - shell: bash
      run: |
        set -euo pipefail

        git config --global user.name "github-actions[bot]"
        git config --global user.email "github-actions[bot]@users.noreply.github.com"

        mkdir -p "${{ github.workspace }}/kernel"
        mkdir -p "${{ github.workspace }}/git-repo"
        # Retry transient network errors (up to 5 attempts, 5s backoff).
        retry() {
          local n=0
          until [ "$n" -ge 5 ]; do
            "$@" && return 0
            n=$((n+1))
            echo "retry $n/5 failed for: $*"
            sleep 5
          done
          return 1
        }
        retry curl -L https://storage.googleapis.com/git-repo-downloads/repo -o "${{ github.workspace }}/git-repo/repo"
        chmod +x "${{ github.workspace }}/git-repo/repo"
        echo "${{ github.workspace }}/git-repo" >> "$GITHUB_PATH"

        if [ -d "${{ github.workspace }}/kernel_patches" ]; then rm -rf "${{ github.workspace }}/kernel_patches"; fi
        retry git clone https://github.com/WildKernels/kernel_patches.git "${{ github.workspace }}/kernel_patches"
        if [ -n "${{ inputs.kernel_patches_commit }}" ]; then
          git -C "${{ github.workspace }}/kernel_patches" fetch --depth=1 origin "${{ inputs.kernel_patches_commit }}"
          git -C "${{ github.workspace }}/kernel_patches" checkout "${{ inputs.kernel_patches_commit }}"
          [ "$(git -C "${{ github.workspace }}/kernel_patches" rev-parse HEAD)" = "${{ inputs.kernel_patches_commit }}" ] || { echo "kernel_patches pin mismatch" >&2; exit 1; }
        fi

        if [ -d "${{ github.workspace }}/AnyKernel3" ]; then rm -rf "${{ github.workspace }}/AnyKernel3"; fi
        retry git clone https://github.com/WildKernels/AnyKernel3.git -b gki-2.0 "${{ github.workspace }}/AnyKernel3"
        if [ -n "${{ inputs.anykernel3_commit }}" ]; then
          git -C "${{ github.workspace }}/AnyKernel3" fetch --depth=1 origin "${{ inputs.anykernel3_commit }}"
          git -C "${{ github.workspace }}/AnyKernel3" checkout "${{ inputs.anykernel3_commit }}"
          [ "$(git -C "${{ github.workspace }}/AnyKernel3" rev-parse HEAD)" = "${{ inputs.anykernel3_commit }}" ] || { echo "AnyKernel3 pin mismatch" >&2; exit 1; }
        fi

    - name: Install build deps for BTF generation (android12-5.10)
      shell: bash
      if: inputs.version == 'android12-5.10'
      run: |
        set -euo pipefail
        sudo apt-get update -qq
        sudo apt-get install -y -qq dwarves libelf-dev