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

const STATUSES = ['idea', 'active', 'paused', 'done', 'abandoned'];

const createSchema = z.object({
  slug: z.string().min(1).max(64).regex(/^[a-z0-9-]+$/),
  name: z.string().min(1).max(200),
  description: z.string().optional(),
  status: z.enum(STATUSES).optional(),
  started_at: z.string().datetime().nullable().optional()
});

const patchSchema = z.object({
  slug: z.string().min(1).max(64).regex(/^[a-z0-9-]+$/).optional(),
  name: z.string().min(1).max(200).optional(),
  description: z.string().nullable().optional(),
  status: z.enum(STATUSES).optional(),
  started_at: z.string().datetime().nullable().optional(),
  completed_at: z.string().datetime().nullable().optional()
});

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

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

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('/',
  requireWrite('project'),
  validate({ params: spaceParams, body: createSchema }),
  asyncWrap(async (req, res) => {
    const payload = { ...req.body, space_id: req.params.space_id };
    if (req.capTier === 'suggest') {
      return divertToPending(req, res, { entity_type: 'project', action: 'create', payload });
    }
    try {
      const row = await repo.create(payload, req.actor);
      res.status(201).json(row);
    } catch (e) {
      if (e.code === '23503') throw new ValidationError('invalid space', { space_id: req.params.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('project not found');
    res.json(row);
  })
);

router.patch('/:id',
  requireWrite('project'),
  validate({ params: idParams, body: patchSchema }),
  asyncWrap(async (req, res) => {
    const existing = await repo.getById(req.params.id);
    if (!existing) throw new NotFoundError('project not found');
    if (req.capTier === 'suggest') {
      return divertToPending(req, res, {
        entity_type: 'project', entity_id: req.params.id, action: 'update', payload: req.body
      });
    }
    const row = await repo.update(req.params.id, req.body, req.actor);
    res.json(row);
  })
);

router.delete('/:id',
  requireWrite('project'),
  validate({ params: idParams }),
  asyncWrap(async (req, res) => {
    const existing = await repo.getById(req.params.id);
    if (!existing) throw new NotFoundError('project not found');
    if (req.capTier === 'suggest') {
      return divertToPending(req, res, {
        entity_type: 'project', entity_id: req.params.id, action: 'delete', payload: {}
      });
    }
    await repo.del(req.params.id, req.actor);
    res.status(204).end();
  })
);