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
    defaults:
      run:
        working-directory: ./e2e
    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: Determine changed web files
        id: changed-files
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const files = [];
            const perPage = 100;
            let page = 1;
            while (true) {
              const { data } = await github.rest.pulls.listFiles({
                owner: context.repo.owner,
                repo: context.repo.repo,
                pull_number: context.issue.number,
                per_page: perPage,
                page,
              });
              files.push(...data);
              if (data.length < perPage) break;
              page++;
            }

            const webPrefixes = ['web/', 'i18n/', 'open-api/typescript-sdk/'];
            const webFiles = files
              .map(f => f.filename)
              .filter(f => webPrefixes.some(p => f.startsWith(p)));

            console.log(`Total PR files: ${files.length}`);
            console.log(`Web-related files: ${webFiles.length}`);
            for (const f of webFiles) {
              console.log(`  ${f}`);
            }

            core.setOutput('files', webFiles.join('\n'));
            core.setOutput('has_changes', webFiles.length > 0 ? 'true' : 'false');

      - name: Setup pnpm
        if: steps.changed-files.outputs.has_changes == 'true'
        uses: pnpm/action-setup@41ff72655975bd51cab0327fa583b6e92b6d3061 # v4.2.0

      - name: Setup Node
        if: steps.changed-files.outputs.has_changes == 'true'
        uses: actions/setup-node@6044e13b5dc448c55e2357c09f80417699197238 # v6.2.0
        with:
          node-version-file: './e2e/.nvmrc'
          cache: 'pnpm'
          cache-dependency-path: '**/pnpm-lock.yaml'

      - name: Install e2e dependencies
        if: steps.changed-files.outputs.has_changes == 'true'
        run: pnpm install --frozen-lockfile

      - name: Install Playwright
        if: steps.changed-files.outputs.has_changes == 'true'
        run: pnpm exec playwright install chromium --only-shell

      - name: Analyze affected routes
        if: steps.changed-files.outputs.has_changes == 'true'
        id: routes
        env:
          CHANGED_FILES: ${{ steps.changed-files.outputs.files }}
        run: |
          echo "Changed files:"
          echo "$CHANGED_FILES"
          echo "---"

          ROUTES=$(echo "$CHANGED_FILES" | xargs pnpm exec tsx src/screenshots/analyze-deps.ts 2>&1 | tee /dev/stderr | 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=$(pnpm exec 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"
            echo "Scenarios: $SCENARIO_NAMES"
          fi

      - 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
              echo "Server ready after ${i}s"
              break
            fi
            sleep 1
          done

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

          # Stop the preview server and all children (pnpm spawns vite as child)
          kill $SERVER_PID 2>/dev/null || true
          sleep 1
          # Ensure port is fully released — kill any lingering vite process
          fuser -k 4173/tcp 2>/dev/null || true
          sleep 1

      # === Screenshot base version ===
      # Disable pnpm's verifyDepsBeforeRun for all base steps since the base
      # checkout changes package.json files, making them mismatch the lockfile.
      - 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
          # Clear SvelteKit build cache to avoid stale artifacts from the PR build
          rm -rf web/.svelte-kit web/build
        working-directory: .

      - name: Build SDK (base)
        if: steps.routes.outputs.has_routes == 'true'
        continue-on-error: true
        id: base-sdk
        env:
          PNPM_VERIFY_DEPS_BEFORE_RUN: 'false'
        run: pnpm build
        working-directory: ./open-api/typescript-sdk

      - name: Build web (base)
        if: steps.routes.outputs.has_routes == 'true' && steps.base-sdk.outcome == 'success'
        continue-on-error: true
        id: base-web
        env:
          PNPM_VERIFY_DEPS_BEFORE_RUN: 'false'
        run: pnpm build
        working-directory: ./web

      - name: Take screenshots (base)
        if: steps.routes.outputs.has_routes == 'true' && steps.base-web.outcome == 'success'
        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
          PNPM_VERIFY_DEPS_BEFORE_RUN: 'false'
        run: |
          # Kill any process still on port 4173 from the PR step
          fuser -k 4173/tcp 2>/dev/null || true
          sleep 1

          # 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
              echo "Server ready after ${i}s"
              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
          fuser -k 4173/tcp 2>/dev/null || true

      - name: Restore PR source
        if: steps.routes.outputs.has_routes == 'true'
        env:
          HEAD_SHA: ${{ github.event.pull_request.head.sha }}
        run: |
          git checkout "$HEAD_SHA" -- web/ open-api/typescript-sdk/ i18n/ || true
        working-directory: .

      # === Compare and report ===
      - name: Compare screenshots
        if: steps.routes.outputs.has_routes == 'true'
        env:
          WORKSPACE_DIR: ${{ github.workspace }}
        run: |
          # Ensure directories exist even if base screenshots were skipped
          mkdir -p "$WORKSPACE_DIR/screenshots/base" "$WORKSPACE_DIR/screenshots/pr" "$WORKSPACE_DIR/screenshots/diff"
          pnpm exec tsx src/screenshots/compare.ts \
            "$WORKSPACE_DIR/screenshots/base" \
            "$WORKSPACE_DIR/screenshots/pr" \
            "$WORKSPACE_DIR/screenshots/diff"

      - name: Upload screenshot artifacts
        if: steps.routes.outputs.has_routes == 'true'
        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
        with:
          name: visual-review-screenshots
          path: screenshots/
          retention-days: 14

      - name: Upload HTML report
        if: steps.routes.outputs.has_routes == 'true'
        id: html-report
        uses: actions/upload-artifact@bbbca2ddaa5d8feaa63e36b76fdaad77386f024f # v7.0.0
        with:
          path: screenshots/diff/visual-review.html
          archive: false
          retention-days: 14

      - name: Post comparison results
        if: steps.routes.outputs.has_routes == 'true'
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        env:
          REPORT_URL: ${{ steps.html-report.outputs.artifact-url }}
          RUN_URL: ${{ github.server_url }}/${{ github.repository }}/actions/runs/${{ github.run_id }}
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const fs = require('fs');
            const path = require('path');

            const reportPath = path.join(process.env.GITHUB_WORKSPACE, 'screenshots', 'diff', 'report.md');

            let body;
            try {
              body = fs.readFileSync(reportPath, 'utf8');
            } catch {
              body = '## Visual Review\n\nScreenshot comparison failed. Check the workflow artifacts for details.';
            }

            // Append links to the HTML report artifact and workflow run
            const reportUrl = process.env.REPORT_URL;
            const runUrl = process.env.RUN_URL;
            body += '\n---\n';
            if (reportUrl) {
              body += `[View full visual comparison](${reportUrl}) | `;
            }
            body += `[Download all screenshots](${runUrl}#artifacts)\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')
            );

            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: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const body = '## Visual Review\n\nNo web-related file changes detected in this PR. Visual review not needed.';
            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,
              });
            }

      - name: No affected routes
        if: steps.changed-files.outputs.has_changes == 'true' && steps.routes.outputs.has_routes != 'true'
        uses: actions/github-script@ed597411d8f924073f98dfc5c65a23a2325f34cd # v8.0.0
        with:
          github-token: ${{ steps.token.outputs.token }}
          script: |
            const body = '## Visual Review\n\nChanged files don\'t affect any pages with screenshot scenarios configured.\nTo add coverage, define new scenarios in `e2e/src/screenshots/page-map.ts`.';
            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,
              });
            }