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

const STATUSES = ['todo', 'doing', 'blocked', 'done'];

const createSchema = z.object({
  project_id: z.string().uuid().nullable().optional(),
  title: z.string().min(1).max(500),
  body: z.string().optional(),
  priority: z.number().int().optional(),
  due_at: z.string().datetime().nullable().optional(),
  position: z.number().int().optional()
});

const patchSchema = z.object({
  project_id: z.string().uuid().nullable().optional(),
  title: z.string().min(1).max(500).optional(),
  body: z.string().nullable().optional(),
  status: z.enum(STATUSES).optional(),
  priority: z.number().int().nullable().optional(),
  due_at: z.string().datetime().nullable().optional(),
  position: z.number().int().nullable().optional()
});

const idParams = z.object({ id: z.string().uuid() });
const spaceParams = z.object({ space_id: z.string().uuid() });
const projectParams = z.object({ project_id: z.string().uuid() });

export const router = Router();
export const spacesScopedRouter = Router({ mergeParams: true });
export const projectsScopedRouter = Router({ mergeParams: true });

spacesScopedRouter.get('/',
  validate({ params: spaceParams, query: z.object({ status: z.enum(STATUSES).optional() }) }),
  asyncWrap(async (req, res) => {
    res.json(await repo.listBySpace(req.params.space_id, { status: req.validatedQuery.status }));
  })
);

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

projectsScopedRouter.get('/',
  validate({ params: projectParams }),
  asyncWrap(async (req, res) => {
    res.json(await repo.listByProject(req.params.project_id));
  })
);

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