name: PR Review Automation

on:
  pull_request:
    types: [opened, synchronize, reopened, edited]

concurrency:
  group: pr-review-${{ github.event.pull_request.number }}
  cancel-in-progress: true

jobs:
  review:
    runs-on: ubuntu-latest
    permissions:
      pull-requests: write
    container:
      image: ubuntu:22.04
      options: --dns 8.8.8.8 --dns 1.1.1.1
    steps:
      - name: Install dependencies
        shell: bash
        run: |
          set -euo pipefail
          apt-get update -qq && apt-get install -y -qq git curl jq

      - name: Checkout code
        shell: bash
        env:
          REPOSITORY: ${{ github.repository }}
        run: |
          set -euo pipefail
          git init
          git remote add origin "https://gogs.tftsr.com/${REPOSITORY}.git"
          git fetch --depth=1 origin ${{ github.head_ref }}
          git checkout FETCH_HEAD

      - name: Get PR diff
        id: diff
        shell: bash
        run: |
          set -euo pipefail
          git fetch origin ${{ github.base_ref }}
          git diff origin/${{ github.base_ref }}..HEAD > /tmp/pr_diff.txt
          echo "diff_size=$(wc -l < /tmp/pr_diff.txt | tr -d ' ')" >> $GITHUB_OUTPUT

      - name: Analyze with Ollama
        id: analyze
        if: steps.diff.outputs.diff_size != '0'
        shell: bash
        env:
          OLLAMA_URL: https://ollama-ui.tftsr.com/ollama/v1
          OLLAMA_API_KEY: ${{ secrets.OLLAMA_API_KEY }}
          PR_TITLE: ${{ github.event.pull_request.title }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
        run: |
          set -euo pipefail
          if grep -q "^Binary files" /tmp/pr_diff.txt; then
            echo "WARNING: Binary file changes detected — they will be excluded from analysis"
          fi
          DIFF_CONTENT=$(head -n 500 /tmp/pr_diff.txt \
            | grep -v -E '^[+-].*(password[[:space:]]*[=:"'"'"']|token[[:space:]]*[=:"'"'"']|secret[[:space:]]*[=:"'"'"']|api_key[[:space:]]*[=:"'"'"']|private_key[[:space:]]*[=:"'"'"']|Authorization:[[:space:]]|AKIA[A-Z0-9]{16}|xox[baprs]-[0-9]{10,13}-[0-9]{10,13}-[a-zA-Z0-9]{24}|gh[opsu]_[A-Za-z0-9_]{36,}|https?://[^@[:space:]]+:[^@[:space:]]+@)' \
            | grep -v -E '^[+-].*[A-Za-z0-9+/]{40,}={0,2}([^A-Za-z0-9+/=]|$)')
          PROMPT="Analyze the following code changes for correctness, security issues, and best practices. PR Title: ${PR_TITLE}\n\nDiff:\n${DIFF_CONTENT}\n\nProvide a review with: 1) Summary, 2) Bugs/errors, 3) Security issues, 4) Best practices. Give specific comments with suggested fixes."
          BODY=$(jq -cn \
            --arg model "qwen3-coder-next:latest" \
            --arg content "$PROMPT" \
            '{model: $model, messages: [{role: "user", content: $content}], stream: false}')
          echo "[$(date -u +%Y-%m-%dT%H:%M:%SZ)] PR #${PR_NUMBER} - Calling Ollama API (${#BODY} bytes)..."
          HTTP_CODE=$(curl -s --max-time 120 --connect-timeout 30 \
            --retry 3 --retry-delay 5 --retry-connrefused --retry-max-time 120 \
            -o /tmp/ollama_response.json -w "%{http_code}" \
            -X POST "$OLLAMA_URL/chat/completions" \
            -H "Authorization: Bearer $OLLAMA_API_KEY" \
            -H "Content-Type: application/json" \
            -d "$BODY")
          echo "HTTP status: $HTTP_CODE"
          echo "Response file size: $(wc -c < /tmp/ollama_response.json) bytes"
          if [ "$HTTP_CODE" != "200" ]; then
            echo "ERROR: Ollama returned HTTP $HTTP_CODE"
            cat /tmp/ollama_response.json
            exit 1
          fi
          if ! jq empty /tmp/ollama_response.json 2>/dev/null; then
            echo "ERROR: Invalid JSON response from Ollama"
            cat /tmp/ollama_response.json
            exit 1
          fi
          REVIEW=$(jq -r '.choices[0].message.content // empty' /tmp/ollama_response.json)
          if [ -z "$REVIEW" ]; then
            echo "ERROR: No content in Ollama response"
            exit 1
          fi
          echo "Review length: ${#REVIEW} chars"
          echo "$REVIEW" > /tmp/pr_review.txt

      - name: Post review comment
        if: always() && steps.diff.outputs.diff_size != '0'
        shell: bash
        env:
          TF_TOKEN: ${{ secrets.TFT_GITEA_TOKEN }}
          PR_NUMBER: ${{ github.event.pull_request.number }}
          REPOSITORY: ${{ github.repository }}
        run: |
          set -euo pipefail
          if [ -z "${TF_TOKEN:-}" ]; then
            echo "ERROR: TFT_GITEA_TOKEN secret is not set"
            exit 1
          fi
          if [ -f "/tmp/pr_review.txt" ] && [ -s "/tmp/pr_review.txt" ]; then
            REVIEW_BODY=$(head -c 65536 /tmp/pr_review.txt)
            BODY=$(jq -n \
              --arg body "🤖 Automated PR Review:\n\n${REVIEW_BODY}\n\n---\n*this is an automated review from Ollama*" \
              '{body: $body, event: "COMMENT"}')
          else
            BODY=$(jq -n \
              '{body: "⚠️ Automated PR Review could not be completed — Ollama analysis failed or produced no output.", event: "COMMENT"}')
          fi
          HTTP_CODE=$(curl -s --max-time 30 --connect-timeout 10 \
            -o /tmp/review_post_response.json -w "%{http_code}" \
            -X POST "https://gogs.tftsr.com/api/v1/repos/${REPOSITORY}/pulls/${PR_NUMBER}/reviews" \
            -H "Authorization: Bearer $TF_TOKEN" \
            -H "Content-Type: application/json" \
            -d "$BODY")
          echo "[$(date -u +%Y-%m-%dT%H:%M:%SZ)] Post review HTTP status: $HTTP_CODE"
          if [ "$HTTP_CODE" != "200" ] && [ "$HTTP_CODE" != "201" ]; then
            echo "ERROR: Failed to post review (HTTP $HTTP_CODE)"
            cat /tmp/review_post_response.json
            exit 1
          fi

      - name: Cleanup
        if: always()
        shell: bash
        run: rm -f /tmp/pr_diff.txt /tmp/ollama_response.json /tmp/pr_review.txt /tmp/review_post_response.json