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

const KINDS = ['url', 'video', 'pdf', 'image', 'file'];

const baseFields = {
  space_id: z.string().uuid(),
  kind: z.enum(KINDS),
  source_url: z.string().url().nullable().optional(),
  title: z.string().max(500).nullable().optional(),
  description: z.string().nullable().optional(),
  summary: z.string().nullable().optional(),
  body_text: z.string().nullable().optional(),
  blob_path: z.string().nullable().optional(),
  thumbnail: z.string().nullable().optional(),
  metadata: z.record(z.string(), z.any()).optional(),
  status: z.string().optional(),
  source_kind: z.string().nullable().optional(),
  external_id: z.string().nullable().optional(),
  captured_at: z.string().datetime().optional()
};

const createSchema = z.object(baseFields);
const upsertSchema = z.object({
  ...baseFields,
  source_kind: z.string().min(1),
  external_id: z.string().min(1)
});
const patchSchema = z.object(Object.fromEntries(
  Object.entries(baseFields).map(([k, v]) => [k, v.optional()])
)).partial();

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

export const router = Router();

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

router.post('/',
  validate({ body: createSchema }),
  asyncWrap(async (req, res) => {
    try {
      const row = await repo.create(req.body, req.actor);
      res.status(201).json(row);
    } catch (e) {
      if (e.code === '23503') throw new ValidationError('invalid space', { space_id: req.body.space_id });
      throw e;
    }
  })
);

router.post('/upsert',
  validate({ body: upsertSchema }),
  asyncWrap(async (req, res) => {
    try {
      const row = await repo.upsertByExternal(req.body, req.actor);
      res.json(row);
    } catch (e) {
      if (e.code === '23503') throw new ValidationError('invalid space', { space_id: req.body.space_id });
      throw e;
    }
  })
);

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

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

router.delete('/:id',
  validate({ params: idParams }),
  asyncWrap(async (req, res) => {
    const existing = await repo.getById(req.params.id);
    if (!existing) throw new NotFoundError('ref not found');
    await repo.del(req.params.id, req.actor);
    res.status(204).end();
  })
);