name: Visual Review

on:
  pull_request:
    types: [labeled, synchronize]

permissions: {}

jobs:
  visual-diff:
    name: Visual Diff Screenshots
    runs-on: ubuntu-latest
    if: >-
      (github.event.action == 'labeled' && github.event.label.name == 'visual-review') ||
      (github.event.action == 'synchronize' && contains(github.event.pull_request.labels.*.name, 'visual-review'))
    permissions:
      contents: read
      pull-requests: write
    steps:
      - id: token
        uses: immich-app/devtools/actions/create-workflow-token@05e16407c0a5492138bb38139c9d9bf067b40886 # create-workflow-token-action-v1.0.1
        with:
          app-id: ${{ secrets.PUSH_O_MATIC_APP_ID }}
          private-key: ${{ secrets.PUSH_O_MATIC_APP_KEY }}

      - name: Checkout PR branch
        uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
        with:
          persist-credentials: false
          token: ${{ steps.token.outputs.token }}
          fetch-depth: 0

      - name: Setup pnpm
        uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0

      - name: Setup Node
        uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
        with:
          node-version-file: './e2e/.nvmrc'
          cache: 'pnpm'
          cache-dependency-path: '**/pnpm-lock.yaml'

      - name: Install Playwright
        run: pnpm exec playwright install chromium --only-shell
        working-directory: ./e2e

      - name: Determine changed web files
        id: changed-files
        env:
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
        run: |
          CHANGED=$(git diff --name-only "$BASE_SHA"..."$HEAD_SHA" -- 'web/' 'i18n/' 'open-api/typescript-sdk/' | head -500)
          echo "files<<EOF" >> "$GITHUB_OUTPUT"
          echo "$CHANGED" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

          # Check if there are any web changes at all
          if [ -z "$CHANGED" ]; then
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
          else
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
          fi

      - name: Analyze affected routes
        if: steps.changed-files.outputs.has_changes == 'true'
        id: routes
        env:
          CHANGED_FILES: ${{ steps.changed-files.outputs.files }}
        run: |
          # Install dependencies for the analyzer
          pnpm install --frozen-lockfile

          # Run the dependency analyzer
          ROUTES=$(echo "$CHANGED_FILES" | xargs npx tsx src/screenshots/analyze-deps.ts 2>/dev/null | grep "^  /" | sed 's/^  //' || true)

          echo "routes<<EOF" >> "$GITHUB_OUTPUT"
          echo "$ROUTES" >> "$GITHUB_OUTPUT"
          echo "EOF" >> "$GITHUB_OUTPUT"

          if [ -z "$ROUTES" ]; then
            echo "has_routes=false" >> "$GITHUB_OUTPUT"
          else
            echo "has_routes=true" >> "$GITHUB_OUTPUT"

            # Build the scenario filter JSON array
            SCENARIO_NAMES=$(npx tsx -e "
              import { getScenariosForRoutes } from './src/screenshots/page-map.ts';
              const routes = process.argv.slice(1);
              const scenarios = getScenariosForRoutes(routes);
              console.log(JSON.stringify(scenarios.map(s => s.name)));
            " $ROUTES)
            echo "scenarios=$SCENARIO_NAMES" >> "$GITHUB_OUTPUT"
          fi
        working-directory: ./e2e

      - name: Post initial comment
        if: steps.changed-files.outputs.has_changes == 'true' && steps.routes.outputs.has_routes == 'true'
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        env:
          AFFECTED_ROUTES: ${{ steps.routes.outputs.routes }}
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const routes = process.env.AFFECTED_ROUTES || '';
            const body = `## Visual Review\n\nGenerating screenshots for affected pages...\n\nAffected routes:\n\`\`\`\n${routes}\n\`\`\``;
            const comments = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });
            const existing = comments.data.find(c => c.body && c.body.includes('## Visual Review'));
            if (existing) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: existing.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

      # === Screenshot PR version ===
      - name: Build SDK (PR)
        if: steps.routes.outputs.has_routes == 'true'
        run: pnpm install --frozen-lockfile && pnpm build
        working-directory: ./open-api/typescript-sdk

      - name: Build web (PR)
        if: steps.routes.outputs.has_routes == 'true'
        run: pnpm install --frozen-lockfile && pnpm build
        working-directory: ./web

      - name: Take screenshots (PR)
        if: steps.routes.outputs.has_routes == 'true'
        env:
          PW_EXPERIMENTAL_SERVICE_WORKER_NETWORK_EVENTS: '1'
          SCREENSHOT_OUTPUT_DIR: ${{ github.workspace }}/screenshots/pr
          SCREENSHOT_SCENARIOS: ${{ steps.routes.outputs.scenarios }}
          SCREENSHOT_BASE_URL: http://127.0.0.1:4173
        run: |
          # Start the preview server in background
          cd ../web && pnpm preview --port 4173 --host 127.0.0.1 &
          SERVER_PID=$!

          # Wait for server to be ready
          for i in $(seq 1 30); do
            if curl -s http://127.0.0.1:4173 > /dev/null 2>&1; then
              break
            fi
            sleep 1
          done

          # Run screenshot tests
          pnpm exec playwright test --config playwright.screenshot.config.ts || true

          # Stop the preview server
          kill $SERVER_PID 2>/dev/null || true
        working-directory: ./e2e

      # === Screenshot base version ===
      - name: Checkout base web directory
        if: steps.routes.outputs.has_routes == 'true'
        env:
          BASE_SHA: ${{ github.event.pull_request.base.sha }}
        run: |
          # Restore web directory from base branch
          git checkout "$BASE_SHA" -- web/ open-api/typescript-sdk/ i18n/ || true

      - name: Build SDK (base)
        if: steps.routes.outputs.has_routes == 'true'
        run: pnpm install --frozen-lockfile && pnpm build
        working-directory: ./open-api/typescript-sdk

      - name: Build web (base)
        if: steps.routes.outputs.has_routes == 'true'
        run: pnpm install --frozen-lockfile && pnpm build
        working-directory: ./web

      - name: Take screenshots (base)
        if: steps.routes.outputs.has_routes == 'true'
        env:
          PW_EXPERIMENTAL_SERVICE_WORKER_NETWORK_EVENTS: '1'
          SCREENSHOT_OUTPUT_DIR: ${{ github.workspace }}/screenshots/base
          SCREENSHOT_SCENARIOS: ${{ steps.routes.outputs.scenarios }}
          SCREENSHOT_BASE_URL: http://127.0.0.1:4173
        run: |
          # Start the preview server in background
          cd ../web && pnpm preview --port 4173 --host 127.0.0.1 &
          SERVER_PID=$!

          # Wait for server to be ready
          for i in $(seq 1 30); do
            if curl -s http://127.0.0.1:4173 > /dev/null 2>&1; then
              break
            fi
            sleep 1
          done

          # Run screenshot tests
          pnpm exec playwright test --config playwright.screenshot.config.ts || true

          # Stop the preview server
          kill $SERVER_PID 2>/dev/null || true
        working-directory: ./e2e

      # === Compare and report ===
      - name: Compare screenshots
        if: steps.routes.outputs.has_routes == 'true'
        id: compare
        env:
          WORKSPACE_DIR: ${{ github.workspace }}
        run: |
          npx tsx src/screenshots/compare.ts \
            "$WORKSPACE_DIR/screenshots/base" \
            "$WORKSPACE_DIR/screenshots/pr" \
            "$WORKSPACE_DIR/screenshots/diff"
        working-directory: ./e2e

      - name: Upload screenshot artifacts
        if: steps.routes.outputs.has_routes == 'true'
        uses: actions/upload-artifact@b7c566a772e6b6bfb58ed0dc250532a479d7789f # v6.0.0
        with:
          name: visual-review-screenshots
          path: screenshots/
          retention-days: 14

      - name: Post comparison results
        if: steps.routes.outputs.has_routes == 'true'
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        env:
          WORKSPACE_DIR: ${{ github.workspace }}
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const fs = require('fs');
            const path = require('path');

            const workspaceDir = process.env.WORKSPACE_DIR;
            const diffDir = path.join(workspaceDir, 'screenshots', 'diff');
            const baseDir = path.join(workspaceDir, 'screenshots', 'base');
            const prDir = path.join(workspaceDir, 'screenshots', 'pr');

            // Read comparison results
            let results;
            try {
              results = JSON.parse(fs.readFileSync(path.join(diffDir, 'results.json'), 'utf8'));
            } catch {
              // Post a simple message if comparison failed
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body: '## Visual Review\n\nScreenshot comparison failed. Check the workflow artifacts for details.'
              });
              return;
            }

            const changed = results.filter(r => r.changePercent > 0.1);
            const unchanged = results.filter(r => r.changePercent <= 0.1);

            let body = '## Visual Review\n\n';

            if (changed.length === 0) {
              body += 'No visual changes detected in the affected pages.\n';
            } else {
              body += `Found **${changed.length}** page(s) with visual changes`;
              if (unchanged.length > 0) {
                body += ` (${unchanged.length} unchanged)`;
              }
              body += '.\n\n';
              body += '> **Note:** Download the `visual-review-screenshots` artifact to view full-resolution before/after/diff images.\n\n';

              for (const result of changed) {
                body += `### ${result.name}\n\n`;

                if (!result.baseExists) {
                  body += '**New page** — no base screenshot to compare against.\n\n';
                  continue;
                }

                if (!result.prExists) {
                  body += '**Removed page** — no longer exists in the PR.\n\n';
                  continue;
                }

                body += `Change: **${result.changePercent.toFixed(1)}%** of pixels (${result.diffPixels.toLocaleString()} pixels differ)\n\n`;
              }
            }

            if (unchanged.length > 0) {
              body += '<details>\n<summary>Unchanged pages (' + unchanged.length + ')</summary>\n\n';
              for (const result of unchanged) {
                body += `- ${result.name}\n`;
              }
              body += '\n</details>\n';
            }

            // Find and update existing comment or create new one
            const comments = await github.rest.issues.listComments({
              owner: context.repo.owner,
              repo: context.repo.repo,
              issue_number: context.issue.number,
            });

            const botComment = comments.data.find(c =>
              c.body && c.body.includes('## Visual Review') && c.body.includes('visual-review')
            );

            if (botComment) {
              await github.rest.issues.updateComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                comment_id: botComment.id,
                body,
              });
            } else {
              await github.rest.issues.createComment({
                owner: context.repo.owner,
                repo: context.repo.repo,
                issue_number: context.issue.number,
                body,
              });
            }

      - name: No web changes
        if: steps.changed-files.outputs.has_changes != 'true'
        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2.8.2
        with:
          github-token: ${{ steps.token.outputs.token }}
          message-id: 'visual-review'
          message: |
            ## Visual Review

            No web-related file changes detected in this PR. Visual review not needed.

      - name: No affected routes
        if: steps.changed-files.outputs.has_changes == 'true' && steps.routes.outputs.has_routes != 'true'
        uses: mshick/add-pr-comment@b8f338c590a895d50bcbfa6c5859251edc8952fc # v2.8.2
        with:
          github-token: ${{ steps.token.outputs.token }}
          message-id: 'visual-review'
          message: |
            ## Visual Review

            Changed files don't affect any pages with screenshot scenarios configured.
            To add coverage, define new scenarios in `e2e/src/screenshots/page-map.ts`.