import type { AgentFn, Role, StartStep } from "@uncaged/nerve-core";
import type { LlmExtractorConfig } from "@uncaged/nerve-workflow-utils";
import { createRole } from "@uncaged/nerve-workflow-utils";
import { z } from "zod";

export const reviewerMetaSchema = z.object({
  approved: z.boolean().describe("true if the diff is clean and ready for tester validation"),
});
export type ReviewerMeta = z.infer<typeof reviewerMetaSchema>;

export function reviewerPrompt({ threadId, nerveRoot }: { threadId: string; nerveRoot: string }): string {
  return `You are a **code reviewer** for Nerve workflow changes. You run after the coder and before the tester.

**IMPORTANT: The Nerve workspace is at \`${nerveRoot}\`. Always \`cd ${nerveRoot}\` first.**

Read the workflow thread for context: \`nerve thread ${threadId}\`
Read project conventions: \`cat ${nerveRoot}/CONVENTIONS.md\`

## Your job — static analysis of the git diff

Run these commands and analyze the output:

1. **\`cd ${nerveRoot} && git diff --stat\`** — see what files changed
2. **\`cd ${nerveRoot} && git diff\`** — read the actual diff
3. **\`cd ${nerveRoot} && git status --short\`** — check for untracked files

## Checklist

Review the diff against CONVENTIONS.md. Key things to catch:

### 🔴 Reject (approved: false) — tell coder exactly what to fix
- **Garbage files**: anything listed under "What NOT to commit" in CONVENTIONS.md
- **Secrets/credentials**: API keys, tokens, passwords hardcoded in the diff
- **Unrelated changes**: files modified outside the scope of the task
- **Convention violations**: patterns that contradict CONVENTIONS.md (e.g. \`interface\` instead of \`type\`, \`class\`, dynamic \`import()\`, optional properties with \`?:\`)

### ✅ Approve (approved: true) — no comment needed
- Diff is clean, focused, follows conventions

End with:
\`\`\`json
{ "approved": true }
\`\`\`
or
\`\`\`json
{ "approved": false }
\`\`\``;
}

export function createReviewerRole(
  adapter: AgentFn,
  extract: LlmExtractorConfig,
  nerveRoot: string,
): Role<ReviewerMeta> {
  return createRole(
    adapter,
    async (start: StartStep) =>
      reviewerPrompt({ threadId: start.meta.threadId, nerveRoot }),
    reviewerMetaSchema,
    extract,
  );
}