import * as db from '../../db/warehouse.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(val, field = 'id') {
    const id = Number(val);
    if (!Number.isInteger(id) || id <= 0) {
        return { error: `${field} is required` };
    }
    return { id };
}

function warehouseErrorStatus(error) {
    if (error.message === 'No company selected') return 400;
    if (error.message === 'Not authorized') return 403;
    if (error.message === 'Company not found') return 404;
    if (error.message === 'Warehouse not found') return 404;
    if (error.message === 'Name required') return 400;
    if (error.message === 'Warehouse already exists') return 409;
    if (error.message === 'Warehouse in use in ledger') return 409;
    if (error.message === 'Invalid warehouse order') return 400;
    if (error.message === 'Invalid sort') return 400;
    return 500;
}

// #endregion

/**
 * Registers warehouse routes for the authenticated user's selected company.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /warehouse:
     *   get:
     *     tags: [Warehouse]
     *     summary: List warehouses
     *     description: Lists warehouses for the selected company, ordered by sort and name.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: warehouse/list.md
     *     responses:
     *       200:
     *         description: List of warehouses
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouses:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/Warehouse'
     *       400:
     *         description: No company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region GET /warehouse

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

        try {
            const warehouses = await db.list(req.user.id);
            res.status(200).json({ warehouses });
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('List warehouses failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /warehouse/order:
     *   put:
     *     tags: [Warehouse]
     *     summary: Reorder warehouses
     *     description: |
     *       Reorders warehouses for the selected company.
     *       `warehouseIds` must include all existing warehouse IDs exactly once.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [warehouse]
     *     x-markdown: warehouse/order.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [warehouseIds]
     *             properties:
     *               warehouseIds:
     *                 type: array
     *                 items:
     *                   type: integer
     *     responses:
     *       200:
     *         description: Applied warehouse order
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouseIds:
     *                   type: array
     *                   items:
     *                     type: integer
     *       400:
     *         description: Invalid warehouse order or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PUT /warehouse/order

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

        const { warehouseIds } = req.body ?? {};

        try {
            const result = await db.order(req.user.id, { warehouseIds });
            emit('warehouse', { companyId: selected.companyId });
            res.status(200).json(result);
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('Order warehouses failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /warehouse/{id}:
     *   get:
     *     tags: [Warehouse]
     *     summary: Get warehouse by ID
     *     description: Retrieves a single warehouse for the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Warehouse ID
     *     x-markdown: warehouse/get.md
     *     responses:
     *       200:
     *         description: Warehouse details
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouse:
     *                   $ref: '#/components/schemas/Warehouse'
     *       400:
     *         description: Invalid ID or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region GET /warehouse/:id

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

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

        try {
            const warehouse = await db.getById(req.user.id, parsedId.id);
            if (!warehouse) {
                return res.status(404).json({ error: 'Warehouse not found' });
            }
            res.status(200).json({ warehouse });
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('Get warehouse failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /warehouse:
     *   post:
     *     tags: [Warehouse]
     *     summary: Create warehouse
     *     description: |
     *       Creates a new warehouse for the selected company.
     *       Sort order will be automatically appended if omitted.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [warehouse]
     *     x-markdown: warehouse/create.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/WarehouseCreateInput'
     *     responses:
     *       201:
     *         description: Created warehouse
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouse:
     *                   $ref: '#/components/schemas/Warehouse'
     *       400:
     *         description: Invalid input or missing fields
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Warehouse already exists
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region POST /warehouse

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

        const { name, sort } = req.body ?? {};

        try {
            const warehouse = await db.create(req.user.id, { name, sort });
            emit('warehouse', { companyId: selected.companyId });
            res.status(201).json({ warehouse });
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('Create warehouse failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    async function handleUpdate(req, res) {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

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

        const { name, sort } = req.body ?? {};

        try {
            const warehouse = await db.update(req.user.id, parsedId.id, { name, sort });
            emit('warehouse', { companyId: selected.companyId });
            res.status(200).json({ warehouse });
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('Update warehouse failed:', error);
            res.status(status).json({ error: error.message });
        }
    }

    /**
     * @openapi
     * /warehouse/{id}:
     *   patch:
     *     tags: [Warehouse]
     *     summary: Update warehouse (partial)
     *     description: Updates specified fields of an existing warehouse for the selected company.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Warehouse ID
     *     x-markdown: warehouse/update.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/WarehouseUpdateInput'
     *     responses:
     *       200:
     *         description: Updated warehouse
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouse:
     *                   $ref: '#/components/schemas/Warehouse'
     *       400:
     *         description: Invalid input
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Warehouse name conflict
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   put:
     *     tags: [Warehouse]
     *     summary: Update warehouse
     *     description: Updates specified fields of an existing warehouse for the selected company.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [warehouse]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Warehouse ID
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/WarehouseUpdateInput'
     *     responses:
     *       200:
     *         description: Updated warehouse
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 warehouse:
     *                   $ref: '#/components/schemas/Warehouse'
     *       400:
     *         description: Invalid input
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Warehouse name conflict
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PATCH /warehouse/:id

    app.patch(`${basePath}/warehouse/:id`, handleUpdate);

    // #endregion

    // #region PUT /warehouse/:id

    app.put(`${basePath}/warehouse/:id`, handleUpdate);

    // #endregion

    /**
     * @openapi
     * /warehouse/{id}:
     *   delete:
     *     tags: [Warehouse]
     *     summary: Delete warehouse
     *     description: Deletes a warehouse if not in use in the ledger.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [warehouse]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Warehouse ID
     *     x-markdown: warehouse/delete.md
     *     responses:
     *       204:
     *         description: Warehouse deleted
     *       400:
     *         description: Invalid ID or no company selected
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Warehouse not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Warehouse in use in ledger
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region DELETE /warehouse/:id

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

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

        try {
            await db.remove(req.user.id, parsedId.id);
            emit('warehouse', { companyId: selected.companyId });
            res.sendStatus(204);
        } catch (error) {
            const status = warehouseErrorStatus(error);
            if (status === 500) console.error('Delete warehouse failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion
}