name: API Reference Sync

on:
  workflow_dispatch:
  pull_request:
    types: [closed]

permissions:
  actions: read
  contents: write
  pull-requests: write
  issues: write
  repository-projects: write
  id-token: write

concurrency:
  group: api-reference-sync-${{ github.event.pull_request.number || github.run_id }}
  cancel-in-progress: true

jobs:
  # ─── Job 0: Lightweight shell gate ───────────────────────────────────
  analyze:
    if: github.event_name == 'workflow_dispatch' || (github.event.pull_request.merged == true && github.event.pull_request.base.ref == 'main')
    runs-on: ubuntu-latest

    outputs:
      has_changes: ${{ steps.check.outputs.has_changes }}
      pr_number: ${{ steps.context.outputs.pr_number }}
      pr_title: ${{ steps.context.outputs.pr_title }}
      pr_url: ${{ steps.context.outputs.pr_url }}
      pr_body: ${{ steps.context.outputs.pr_body }}

    steps:
      - name: Checkout code
        uses: actions/checkout@v5

      - name: Set PR context
        id: context
        env:
          PR_TITLE: ${{ github.event.pull_request.title || '' }}
          PR_BODY: ${{ github.event.pull_request.body || '' }}
        run: |
          echo "pr_number=${{ github.event.pull_request.number || '' }}" >> "$GITHUB_OUTPUT"
          echo "pr_title=$PR_TITLE" >> "$GITHUB_OUTPUT"
          echo "pr_url=${{ github.event.pull_request.html_url || '' }}" >> "$GITHUB_OUTPUT"
          EOF=$(dd if=/dev/urandom bs=15 count=1 status=none | base64)
          echo "pr_body<<$EOF" >> "$GITHUB_OUTPUT"
          echo "$PR_BODY" >> "$GITHUB_OUTPUT"
          echo "$EOF" >> "$GITHUB_OUTPUT"

      - name: Check for API-relevant changes
        id: check
        env:
          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
        run: |
          if [ "${{ github.event_name }}" = "workflow_dispatch" ]; then
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
            echo "workflow_dispatch — full scan"
            exit 0
          fi

          CHANGED=$(gh pr diff ${{ github.event.pull_request.number }} --name-only || true)

          if echo "$CHANGED" | grep -qE '^packages/(core/src/core/(ui|selectors)|html/src/ui|react/src/ui|store/src)/'; then
            echo "has_changes=true" >> "$GITHUB_OUTPUT"
            echo "API-relevant files changed"
          else
            echo "has_changes=false" >> "$GITHUB_OUTPUT"
            echo "No API-relevant changes detected"
          fi

  # ─── Job 1: Reference copy drift (Claude Opus) ──────────────────────
  docs-reference-copy:
    needs: analyze
    if: needs.analyze.outputs.has_changes == 'true'
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Check reference copy drift
        uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          github_token: ${{ secrets.GITHUB_TOKEN }}
          claude_args: |
            --model opus
            --max-turns 20
            --allowedTools "Bash(pnpm:*)" "Bash(node:*)" "Bash(git:*)" "Bash(gh:*)" "Bash(cat:*)" "Bash(rg:*)"
          prompt: |
            You are the API reference copy-sync agent.
            Your sole job: detect drift between auto-generated API JSON and hand-written MDX prose in reference pages.

            Trigger context:
            - Event: ${{ github.event_name }}
            - PR Number: #${{ needs.analyze.outputs.pr_number }}
            - PR Title: ${{ needs.analyze.outputs.pr_title }}
            - PR URL: ${{ needs.analyze.outputs.pr_url }}
            - PR Body:
              ${{ needs.analyze.outputs.pr_body }}

            Load context before acting:
            - Read `CLAUDE.md` and `.claude/skills/README.md`.
            - Load and follow these skills in order:
              1. `.claude/skills/api-reference/SKILL.md`
              2. `.claude/skills/docs/SKILL.md`
              3. `.claude/skills/commit-pr/SKILL.md`

            Step 1 — Identify impacted components:
            - Use `gh pr diff ${{ needs.analyze.outputs.pr_number }} --name-only` (or `git log` for workflow_dispatch) to find which components/utils changed.
            - Focus only on those components for the rest of the analysis.

            Step 2 — Build API JSON:
            - Run `pnpm install` and `pnpm -C site api-docs`.
            - The generated JSON files are the source of truth — they are always current.

            Step 3 — Compare JSON against MDX:
            - For each impacted component, compare the generated API JSON with the hand-written MDX in `site/src/content/docs/reference/`.
            - "Drift" means the MDX prose doesn't match the JSON. Look for:
              - Missing or removed props/state fields in prose sections.
              - Outdated descriptions that contradict JSON.
              - Missing data attributes in Styling sections.
              - Stale type signatures in prose.
              - Missing sidebar entry in `site/src/docs.config.ts`.
            - For new components with no MDX yet: open an issue noting scaffold is needed, don't attempt it.

            Step 4 — Create/update issues and PRs:
            - Create/update one canonical issue per component using `.github/templates/docs/reference-copy-issue.md`.
            - Issue title: `docs(site): {component_name} api reference update`.
            - Keep at most one active canonical issue per component.
            - If a canonical issue exists, update it and append new trigger references.
            - Fully render template fields; no placeholders.
            - If drift is clear and actionable, create or update one canonical PR per component.
            - PR title: `docs(site): {component_name} api reference update`.
            - PR body must use `.github/templates/api-reference-update-pr.md`.
            - Do not open a PR when analysis is uncertain — use `triage` label instead.

            Labels:
            - Required: `docs`, `api`, `site`, `docs:reference-copy`.
            - Add `components` for component pages.
            - Add `triage` when uncertain.

            Scope restrictions:
            - ONLY check `site/src/content/docs/reference/` — no demos, no concept pages.
            - Do NOT check demo code (separate job handles that).
            - Do NOT check concept/how-to pages (separate job handles that).

  # ─── Job 2: Demo code drift (Claude Sonnet) ─────────────────────────
  docs-demos:
    needs: analyze
    if: needs.analyze.outputs.has_changes == 'true'
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Check demo code drift
        uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          github_token: ${{ secrets.GITHUB_TOKEN }}
          claude_args: |
            --model sonnet
            --max-turns 14
            --allowedTools "Bash(git:*)" "Bash(gh:*)" "Bash(cat:*)" "Bash(rg:*)"
          prompt: |
            You are the API reference demo-sync agent.
            Your sole job: check if demo code uses APIs that changed in a recent PR.

            Trigger context:
            - Event: ${{ github.event_name }}
            - PR Number: #${{ needs.analyze.outputs.pr_number }}
            - PR Title: ${{ needs.analyze.outputs.pr_title }}
            - PR URL: ${{ needs.analyze.outputs.pr_url }}

            Load context before acting:
            - Read `CLAUDE.md`.

            Step 1 — Identify impacted components:
            - Use `gh pr diff ${{ needs.analyze.outputs.pr_number }} --name-only` (or `git log` for workflow_dispatch) to find which components changed.
            - Then use `gh pr diff ${{ needs.analyze.outputs.pr_number }}` to see what specifically changed in their APIs (renamed props, removed options, changed signatures, new data attributes).

            Step 2 — Check demos:
            - For each impacted component, read all demo files in `site/src/components/docs/demos/{component}/`.
            - Check both `html/css/` and `react/css/` variants.
            - Look for: renamed props, removed options, changed signatures, deprecated patterns, new data attributes demos should show.
            - Skip components with no demo directory.

            Step 3 — Create/update issues:
            - Create issues ONLY (no PRs — demo fixes need human judgment).
            - Use `.github/templates/docs/demos-issue.md`.
            - Issue title: `docs(site): {component_name} demo code update`.
            - Keep at most one active canonical issue per component.
            - If a canonical issue exists, update it and append new trigger references.
            - Fully render template fields; no placeholders.
            - Do NOT create an issue if no drift is found.

            Labels (always all of these):
            - `docs`, `api`, `site`, `docs:demos`, `components`, `triage`.

            Scope restrictions:
            - ONLY check `site/src/components/docs/demos/` — no MDX prose, no concept pages.
            - Do NOT check reference page content (separate job handles that).
            - Do NOT check concept/how-to pages (separate job handles that).

  # ─── Job 3: Guide references drift (Claude Sonnet) ──────────────────
  docs-guide-references:
    needs: analyze
    if: needs.analyze.outputs.has_changes == 'true'
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v5
        with:
          fetch-depth: 0

      - name: Check cross-site references
        uses: anthropics/claude-code-action@v1
        with:
          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
          github_token: ${{ secrets.GITHUB_TOKEN }}
          claude_args: |
            --model sonnet
            --max-turns 14
            --allowedTools "Bash(git:*)" "Bash(gh:*)" "Bash(cat:*)" "Bash(rg:*)"
          prompt: |
            You are the cross-site reference sync agent.
            Your sole job: find mentions of changed APIs in docs OUTSIDE `/reference/` that may be stale.

            Trigger context:
            - Event: ${{ github.event_name }}
            - PR Number: #${{ needs.analyze.outputs.pr_number }}
            - PR Title: ${{ needs.analyze.outputs.pr_title }}
            - PR URL: ${{ needs.analyze.outputs.pr_url }}

            Load context before acting:
            - Read `CLAUDE.md`.

            Step 1 — Identify changed APIs:
            - Use `gh pr diff ${{ needs.analyze.outputs.pr_number }} --name-only` (or `git log` for workflow_dispatch) to find which components/utils changed.
            - Then use `gh pr diff ${{ needs.analyze.outputs.pr_number }}` to identify the specific API changes (renamed props, removed exports, changed signatures, etc.).
            - Build a list of API names to search for (PascalCase, camelCase, kebab-case, `media-{name}` variants).

            Step 2 — Grep for references:
            - Run targeted `rg` commands to find files mentioning changed APIs in:
              - `site/src/content/docs/concepts/`
              - `site/src/content/docs/how-to/`
              - `packages/*/README.md`
            - Search for all name variants (kebab, PascalCase, camelCase, `media-{name}` element names).
            - Do NOT search in `site/src/content/docs/reference/` (separate job handles that).
            - Do NOT search in `site/src/components/docs/demos/` (separate job handles that).

            Step 3 — Analyze hits:
            - For each file with grep hits, read the surrounding context and determine:
              - `high` confidence: definitely stale (references removed/renamed API by old name).
              - `medium` confidence: likely stale (references API whose behavior changed).
              - `low` confidence / false positive: grep hit in unrelated context.
            - Be conservative — include borderline cases for human review.
            - Discard clear false positives.

            Step 4 — Create/update triage issues:
            - Create issues ONLY (no PRs).
            - Use `.github/templates/docs/guide-references-issue.md`.
            - Issue title: `docs(site): cross-site api references update`.
            - Group related APIs into one issue when they affect the same files.
            - Keep at most one active canonical issue (search for existing open issues with `drift-type:cross-site-refs` in body).
            - If a canonical issue exists, update it and append new trigger references.
            - Fully render template fields; no placeholders.
            - Do NOT create an issue if no stale references are found.

            Labels (always all of these):
            - `docs`, `site`, `docs:guide-references`, `triage`.

            Scope restrictions:
            - ONLY check docs outside `/reference/` and package READMEs.
            - Do NOT check reference pages (separate job handles that).
            - Do NOT check demo files (separate job handles that).