import { Router } from 'express';
import { z } from 'zod';
import * as repo from '../../db/repos/links.js';
import { validate } from '../validate.js';
import { requireWrite } from '../cap.js';
import { asyncWrap } from '../errors.js';

const ENTITY_TYPES = ['space','project','task','page','ref','resource','source_doc','conversation'];

const createSchema = z.object({
  from_type: z.enum(ENTITY_TYPES),
  from_id: z.string().uuid(),
  to_type: z.enum(ENTITY_TYPES),
  to_id: z.string().uuid(),
  relation: z.string().min(1).max(64).optional()
});

const endpointParams = z.object({
  type: z.enum(ENTITY_TYPES),
  id: z.string().uuid()
});

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

export const router = Router();

router.post('/',
  requireWrite('link'),
  validate({ body: createSchema }),
  asyncWrap(async (req, res) => {
    const { from_type, from_id, to_type, to_id, relation } = req.body;
    const row = await repo.create(from_type, from_id, to_type, to_id, relation);
    res.status(201).json(row);
  })
);

router.get('/from/:type/:id',
  validate({ params: endpointParams }),
  asyncWrap(async (req, res) => {
    res.json(await repo.listFrom(req.params.type, req.params.id));
  })
);

router.get('/to/:type/:id',
  validate({ params: endpointParams }),
  asyncWrap(async (req, res) => {
    res.json(await repo.listTo(req.params.type, req.params.id));
  })
);

router.delete('/:id',
  requireWrite('link'),
  validate({ params: idParams }),
  asyncWrap(async (req, res) => {
    await repo.remove(req.params.id);
    res.status(204).end();
  })
);