import * as db from '../../db/categoryproperty.js';
import { emit } from '../sse.js';

// #region Helpers

function requireSelectedCompany(req) {
    const companyId = req.user?.selectedCompanyId;
    if (companyId == null) {
        return { error: 'No company selected' };
    }
    return { companyId };
}

function parsePositiveInt(value, field) {
    const id = Number(value);
    if (!Number.isInteger(id) || id <= 0) {
        return { error: `${field} is required` };
    }
    return { id };
}

function emitCategorySignal(req) {
    const companyId = req.user?.selectedCompanyId;
    if (companyId == null) return;
    emit('category', { companyId });
}

function categoryPropertyErrorStatus(error) {
    if (error.message === 'No company selected') return 400;
    if (error.message === 'Not authorized') return 403;
    if (error.message === 'Company not found' || error.message === 'Category not found' || error.message === 'Parent not found') return 404;
    if (error.message?.startsWith('Property not found')) return 404;
    if (error.message?.includes('exclusive')) return 400;
    if (error.message === 'Invalid properties array' || error.message === 'Invalid propertyId' || error.message === 'Duplicate propertyId') return 400;
    return 500;
}

// #endregion

/**
 * Registers categoryproperty routes under `/category/:id/property`.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /category/{id}/property:
     *   get:
     *     tags: [Category]
     *     summary: List category properties
     *     description: Fetches all free-form properties set on a category.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Category ID
     *     responses:
     *       200:
     *         description: List of properties for this category
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 properties:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/CategoryProperty'
     *   put:
     *     tags: [Category]
     *     summary: Bulk set category properties
     *     description: Replaces all properties for a category.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Category ID
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [properties]
     *             properties:
     *               properties:
     *                 type: array
     *                 items:
     *                   type: object
     *                   required: [propertyId, value]
     *                   properties:
     *                     propertyId:
     *                       type: integer
     *                     value:
     *                       type: string
     *                     sort:
     *                       type: integer
     *     responses:
     *       200:
     *         description: Updated category properties
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 properties:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/CategoryProperty'
     */
    // #region GET /category/:id/property

    app.get(`${basePath}/category/:id/property`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const idParsed = parsePositiveInt(req.params.id, 'categoryId');
        if (idParsed.error) {
            return res.status(400).json({ error: idParsed.error });
        }

        try {
            const properties = await db.listByCategoryId(req.user.id, idParsed.id);
            res.json({ properties });
        } catch (error) {
            res.status(categoryPropertyErrorStatus(error)).json({ error: error.message });
        }
    });

    // #endregion

    // #region PUT /category/:id/property

    app.put(`${basePath}/category/:id/property`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const idParsed = parsePositiveInt(req.params.id, 'categoryId');
        if (idParsed.error) {
            return res.status(400).json({ error: idParsed.error });
        }

        const propertiesInput = req.body?.properties ?? req.body;
        if (!Array.isArray(propertiesInput)) {
            return res.status(400).json({ error: 'properties array required' });
        }

        try {
            const properties = await db.setByCategoryId(req.user.id, idParsed.id, propertiesInput);
            emitCategorySignal(req);
            res.json({ properties });
        } catch (error) {
            res.status(categoryPropertyErrorStatus(error)).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /category/{id}/property/{propertyId}:
     *   delete:
     *     tags: [Category]
     *     summary: Delete category property
     *     description: Removes a single property from a category.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *       - in: path
     *         name: propertyId
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Deleted successfully
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/SuccessResponse'
     */
    // #region DELETE /category/:id/property/:propertyId

    app.delete(`${basePath}/category/:id/property/:propertyId`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const idParsed = parsePositiveInt(req.params.id, 'categoryId');
        if (idParsed.error) {
            return res.status(400).json({ error: idParsed.error });
        }

        try {
            const propertyId = Number(req.params.propertyId);
            await db.remove(req.user.id, idParsed.id, propertyId);
            emitCategorySignal(req);
            res.json({ ok: true });
        } catch (error) {
            res.status(categoryPropertyErrorStatus(error)).json({ error: error.message });
        }
    });

    // #endregion
}