import * as db from '../../db/order.js';

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

function orderErrorStatus(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 === 'Order not found') return 404;
    if (error.message === 'Entity not found') return 404;
    if (error.message === 'Article not found') return 404;
    if (error.message === 'Invalid order') return 400;
    if (error.message === 'Invalid lines') return 400;
    return 500;
}

/**
 * Registers sales-order routes for the authenticated user's selected company.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /order:
     *   get:
     *     tags: [Order]
     *     summary: List orders
     *     description: |
     *       Lists sales orders (`manifest` rows with `type = 'order'`)
     *       for the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: order/list.md
     *     responses:
     *       200:
     *         description: Order list
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 orders:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/OrderSummary'
     *       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'
     *       404:
     *         description: Company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   post:
     *     tags: [Order]
     *     summary: Create order
     *     description: |
     *       Creates a sales order with header and lines in one transaction.
     *       `date` is the document date (expected delivery).
     *       `entityId` must be a company customer (not Lieferanten/POS), or null.
     *       Each line requires `sku` or `name`, `amount`, `net`, and `taxrate` (rate); `pu` defaults to `1`; `rebate` defaults to `0`.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: order/create.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [number, date, lines]
     *             properties:
     *               number:
     *                 type: string
     *               date:
     *                 type: string
     *                 format: date-time
     *                 description: Document date / expected delivery
     *               entityId:
     *                 type: integer
     *                 nullable: true
     *                 description: Customer entity (manifest.entity_id)
     *               lines:
     *                 type: array
     *                 items:
     *                   $ref: '#/components/schemas/ManifestLineInput'
     *             example:
     *               number: O-2026-001
     *               date: '2026-09-15'
     *               entityId: 1
     *               lines:
     *                 - sku: '1'
     *                   name: 'Sample Article'
     *                   pu: 1
     *                   amount: 10
     *                   net: 99.5
     *                   taxrate: 19
     *     responses:
     *       201:
     *         description: Created order
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 order:
     *                   $ref: '#/components/schemas/Order'
     *       400:
     *         description: Invalid order, invalid lines, 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: Company, entity, or article not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    app.get(`${basePath}/order`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

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

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

        const { number, date, createdAt, entityId, lines } = req.body ?? {};

        try {
            const order = await db.create(req.user.id, {
                number,
                date,
                createdAt,
                entityId,
                lines,
            });
            res.status(201).json({ order });
        } catch (error) {
            const status = orderErrorStatus(error);
            if (status === 500) console.error('Create order failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /order/{id}:
     *   get:
     *     tags: [Order]
     *     summary: Get order
     *     description: Returns a sales order with lines for the selected company.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: order/get.md
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Order
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 order:
     *                   $ref: '#/components/schemas/Order'
     *       400:
     *         description: No company selected or invalid id
     *         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: Order or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   patch:
     *     tags: [Order]
     *     summary: Update order
     *     description: |
     *       Patches header fields that are present. If `lines` is present, replaces
     *       all lines; if omitted, leaves lines unchanged. Returns the full order.
     *       `date` is the document date (expected delivery).
     *     security:
     *       - cookieAuth: []
     *     x-markdown: order/update.md
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               number:
     *                 type: string
     *               date:
     *                 type: string
     *                 format: date-time
     *                 description: Document date / expected delivery
     *               entityId:
     *                 type: integer
     *                 nullable: true
     *               lines:
     *                 type: array
     *                 items:
     *                   $ref: '#/components/schemas/ManifestLineInput'
     *             example:
     *               number: O-2026-001b
     *               lines: []
     *     responses:
     *       200:
     *         description: Updated order
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 order:
     *                   $ref: '#/components/schemas/Order'
     *       400:
     *         description: Invalid order, invalid lines, 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: Order, entity, article, or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   delete:
     *     tags: [Order]
     *     summary: Delete order
     *     description: Deletes the sales order (`manifestarticle` rows cascade).
     *     security:
     *       - cookieAuth: []
     *     x-markdown: order/delete.md
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       204:
     *         description: Deleted
     *       400:
     *         description: No company selected or invalid id
     *         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: Order not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    app.get(`${basePath}/order/:id`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const id = Number(req.params.id);
        if (!Number.isInteger(id) || id <= 0) {
            return res.status(400).json({ error: 'id is required' });
        }

        try {
            const order = await db.getById(req.user.id, id);
            res.status(200).json({ order });
        } catch (error) {
            const status = orderErrorStatus(error);
            if (status === 500) console.error('Get order failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

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

        const id = Number(req.params.id);
        if (!Number.isInteger(id) || id <= 0) {
            return res.status(400).json({ error: 'id is required' });
        }

        const body = req.body ?? {};
        const patch = {};
        if (Object.prototype.hasOwnProperty.call(body, 'number')) {
            patch.number = body.number;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'date')) {
            patch.date = body.date;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'createdAt')) {
            patch.createdAt = body.createdAt;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'entityId')) {
            patch.entityId = body.entityId;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'lines')) {
            patch.lines = body.lines;
        }

        try {
            const order = await db.update(req.user.id, id, patch);
            res.status(200).json({ order });
        } catch (error) {
            const status = orderErrorStatus(error);
            if (status === 500) console.error('Update order failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

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

        const id = Number(req.params.id);
        if (!Number.isInteger(id) || id <= 0) {
            return res.status(400).json({ error: 'id is required' });
        }

        try {
            await db.remove(req.user.id, id);
            res.sendStatus(204);
        } catch (error) {
            const status = orderErrorStatus(error);
            if (status === 500) console.error('Delete order failed:', error);
            res.status(status).json({ error: error.message });
        }
    });
}