import { Router } from 'express';
import { z } from 'zod';
import * as repo from '../../db/repos/conversations.js';
import { validate } from '../validate.js';
import { parsePagination } from '../pagination.js';
import { NotFoundError, asyncWrap } from '../errors.js';

const STATUSES = ['open', 'summarized', 'archived'];

const createSchema = z.object({
  title: z.string().nullable().optional(),
  agent_id: z.string().uuid().nullable().optional(),
  participants: z.array(z.string()).optional(),
  metadata: z.record(z.string(), z.any()).optional()
});

const statusSchema = z.object({ status: z.enum(STATUSES) });
const summarySchema = z.object({ summary: z.string().min(1) });

const idParams = z.object({ id: z.string().uuid() });

export const router = Router();

router.get('/',
  validate({ query: z.object({ limit: z.string().optional(), offset: z.string().optional() }) }),
  asyncWrap(async (req, res) => {
    const { limit, offset } = parsePagination(req);
    res.json(await repo.list({ limit, offset }));
  })
);

router.post('/',
  validate({ body: createSchema }),
  asyncWrap(async (req, res) => {
    const row = await repo.create(req.body, req.actor);
    res.status(201).json(row);
  })
);

router.get('/:id',
  validate({ params: idParams }),
  asyncWrap(async (req, res) => {
    const row = await repo.getById(req.params.id);
    if (!row) throw new NotFoundError('conversation not found');
    res.json(row);
  })
);

router.patch('/:id/status',
  validate({ params: idParams, body: statusSchema }),
  asyncWrap(async (req, res) => {
    const existing = await repo.getById(req.params.id);
    if (!existing) throw new NotFoundError('conversation not found');
    res.json(await repo.setStatus(req.params.id, req.body.status, req.actor));
  })
);

router.patch('/:id/summary',
  validate({ params: idParams, body: summarySchema }),
  asyncWrap(async (req, res) => {
    const existing = await repo.getById(req.params.id);
    if (!existing) throw new NotFoundError('conversation not found');
    res.json(await repo.setSummary(req.params.id, req.body.summary));
  })
);