# This composite action is designed for Gitea Actions runners.
# Gitea Actions supports GitHub Actions syntax including $GITHUB_OUTPUT,
# actions/cache, and actions/checkout.
name: 'AI Code Review'
description: 'Run AI-powered code review on a pull request using review-bot'

inputs:
  gitea-url:
    description: 'Gitea instance URL (defaults to server_url)'
    required: false
    default: ''
  repo:
    description: 'Repository (owner/name, defaults to current)'
    required: false
    default: ''
  pr-number:
    description: 'Pull request number (defaults to current PR)'
    required: false
    default: ''
  reviewer-token:
    description: 'Gitea token for posting the review'
    required: true
  reviewer-name:
    description: 'Display name for the reviewer'
    required: false
    default: ''
  llm-base-url:
    description: 'OpenAI-compatible LLM API base URL'
    required: true
  llm-api-key:
    description: 'LLM API key'
    required: true
  llm-model:
    description: 'LLM model name'
    required: true
  conventions-file:
    description: 'Path to conventions file in the repo (e.g. CLAUDE.md)'
    required: false
    default: ''
  patterns-repo:
    description: 'Repo with language patterns (e.g. rodin/elixir-patterns)'
    required: false
    default: ''
  patterns-files:
    description: 'Comma-separated file paths to fetch from patterns repo'
    required: false
    default: 'README.md'
  temperature:
    description: 'LLM temperature (0 = server default)'
    required: false
    default: '0'
  version:
    description: 'review-bot version to install (e.g. v0.1.0, defaults to latest)'
    required: false
    default: 'latest'
  dry-run:
    description: 'Print review to stdout instead of posting'
    required: false
    default: 'false'

runs:
  using: 'composite'
  steps:
    - name: Determine version
      id: version
      shell: bash
      run: |
        GITEA_URL="${{ inputs.gitea-url || github.server_url }}"
        REPO="${{ inputs.repo || 'rodin/review-bot' }}"
        if [ "${{ inputs.version }}" = "latest" ]; then
          VERSION=$(curl -sSf "${GITEA_URL}/api/v1/repos/${REPO}/releases?limit=1" \
            | python3 -c "import sys, json; releases = json.load(sys.stdin); print(releases[0]['tag_name'] if releases else '')")
          if [ -z "$VERSION" ]; then
            echo "Failed to determine latest version" >&2
            exit 1
          fi
        else
          VERSION="${{ inputs.version }}"
        fi
        echo "version=${VERSION}" >> "$GITHUB_OUTPUT"

    - name: Cache review-bot binary
      id: cache
      uses: actions/cache@v4
      with:
        path: ${{ runner.temp }}/review-bot
        key: review-bot-linux-amd64-${{ steps.version.outputs.version }}

    - name: Install review-bot
      if: steps.cache.outputs.cache-hit != 'true'
      shell: bash
      run: |
        GITEA_URL="${{ inputs.gitea-url || github.server_url }}"
        REPO="${{ inputs.repo || 'rodin/review-bot' }}"
        VERSION="${{ steps.version.outputs.version }}"
        BINARY="review-bot-linux-amd64"

        curl -sSfL "${GITEA_URL}/${REPO}/releases/download/${VERSION}/${BINARY}" \
          -o "${{ runner.temp }}/review-bot"
        curl -sSfL "${GITEA_URL}/${REPO}/releases/download/${VERSION}/checksums.txt" \
          -o "${{ runner.temp }}/checksums.txt"

        # Verify SHA-256 checksum
        cd "${{ runner.temp }}"
        EXPECTED=$(grep "${BINARY}" checksums.txt | awk '{print $1}')
        ACTUAL=$(sha256sum review-bot | awk '{print $1}')

        if [ -z "$EXPECTED" ]; then
          echo "Error: no checksum found for ${BINARY}" >&2
          exit 1
        fi
        if [ "$EXPECTED" != "$ACTUAL" ]; then
          echo "Error: checksum mismatch!" >&2
          echo "  Expected: $EXPECTED" >&2
          echo "  Actual:   $ACTUAL" >&2
          exit 1
        fi

        chmod +x "${{ runner.temp }}/review-bot"
        echo "Installed review-bot ${VERSION} (checksum verified)"

    - name: Run review
      shell: bash
      env:
        GITEA_URL: ${{ inputs.gitea-url || github.server_url }}
        GITEA_REPO: ${{ inputs.repo || github.repository }}
        PR_NUMBER: ${{ inputs.pr-number || github.event.pull_request.number }}
        REVIEWER_TOKEN: ${{ inputs.reviewer-token }}
        REVIEWER_NAME: ${{ inputs.reviewer-name }}
        LLM_BASE_URL: ${{ inputs.llm-base-url }}
        LLM_API_KEY: ${{ inputs.llm-api-key }}
        LLM_MODEL: ${{ inputs.llm-model }}
        CONVENTIONS_FILE: ${{ inputs.conventions-file }}
        PATTERNS_REPO: ${{ inputs.patterns-repo }}
        PATTERNS_FILES: ${{ inputs.patterns-files }}
        LLM_TEMPERATURE: ${{ inputs.temperature }}
      run: |
        ARGS=""
        if [ "${{ inputs.dry-run }}" = "true" ]; then
          ARGS="--dry-run"
        fi
        ${{ runner.temp }}/review-bot $ARGS