name: AI PR Review
description: Automated AI-powered PR code review using any OpenAI-compatible endpoint

inputs:
  api_url:
    description: Base URL of the OpenAI-compatible API endpoint (e.g. https://api.openai.com/v1)
    required: true
  api_key:
    description: API key for the endpoint
    required: true
  model:
    description: Model identifier to use for the review
    required: false
    default: openai/gpt-oss-120b
  github_token:
    description: Token used to post the review comment and fetch PR comments
    required: false
    default: ${{ github.token }}

runs:
  using: composite
  steps:
    - name: Checkout
      uses: actions/checkout@v4
      with:
        fetch-depth: 0

    - name: Fetch previous review context
      id: context
      shell: bash
      env:
        GITEA_TOKEN: ${{ inputs.github_token }}
        GITEA_SERVER_URL: ${{ github.server_url }}
        REPO: ${{ github.repository }}
        PR_NUMBER: ${{ github.event.pull_request.number }}
      run: bash "${{ github.action_path }}/scripts/fetch-context.sh"

    - name: Generate diff
      id: diff
      shell: bash
      env:
        PREV_SHA: ${{ steps.context.outputs.prev_sha }}
      run: bash "${{ github.action_path }}/scripts/generate-diff.sh"

    - name: Run AI review
      id: ai_review
      shell: bash
      env:
        AI_API_URL: ${{ inputs.api_url }}
        AI_API_KEY: ${{ inputs.api_key }}
        AI_MODEL: ${{ inputs.model }}
        PR_TITLE: ${{ github.event.pull_request.title }}
        PR_BODY: ${{ github.event.pull_request.body }}
        PREV_REVIEW: ${{ steps.context.outputs.prev_review }}
        INCREMENTAL: ${{ steps.diff.outputs.incremental }}
      run: bash "${{ github.action_path }}/scripts/run-review.sh"

    - name: Post review comment
      shell: bash
      env:
        GITEA_TOKEN: ${{ inputs.github_token }}
        GITEA_SERVER_URL: ${{ github.server_url }}
        REPO: ${{ github.repository }}
        PR_NUMBER: ${{ github.event.pull_request.number }}
        REVIEW: ${{ steps.ai_review.outputs.review }}
        CURRENT_SHA: ${{ github.event.pull_request.head.sha }}
        TRUNCATED: ${{ steps.diff.outputs.truncated }}
        INCREMENTAL: ${{ steps.diff.outputs.incremental }}
      run: bash "${{ github.action_path }}/scripts/post-comment.sh"