import * as db from '../../db/retoure.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 retoureErrorStatus(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 === 'Retoure not found') return 404;
    if (error.message === 'Manifest not found') return 404;
    if (error.message === 'Entity not found') return 404;
    if (error.message === 'Article not found') return 404;
    if (error.message === 'No entity selected') return 400;
    if (error.message === 'Retoure number already exists') return 409;
    if (error.message === 'Invalid entityId') return 400;
    if (error.message === 'Invalid retoure') return 400;
    if (error.message === 'Invalid lines') return 400;
    if (error.message === 'Invalid offset') return 400;
    if (error.message === 'Invalid limit') return 400;
    if (error.message === 'Invalid seekMonths') return 400;
    if (error.message?.includes('parent article') || error.message?.includes('A parent article')) return 400;
    return 500;
}

// #endregion

/**
 * Registers retoure (customer return) routes for the authenticated user's selected company.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /retoure:
     *   get:
     *     tags: [Retoure]
     *     summary: List retoures
     *     description: |
     *       Lists customer return manifests (`manifest` rows with `type = 'retoure'`)
     *       for the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: query
     *         name: offset
     *         schema:
     *           type: integer
     *           default: 0
     *       - in: query
     *         name: limit
     *         schema:
     *           type: integer
     *           default: 50
     *       - in: query
     *         name: search
     *         schema:
     *           type: string
     *       - in: query
     *         name: onlyUnpaid
     *         schema:
     *           type: boolean
     *       - in: query
     *         name: onlyUndelivered
     *         schema:
     *           type: boolean
     *       - in: query
     *         name: entityId
     *         schema:
     *           type: integer
     *       - in: query
     *         name: seekMonths
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: List of retoures
     *       400:
     *         description: Validation error
     *       403:
     *         description: Not authorized
     */
    app.get(`${basePath}/retoure`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

        const opts = {};
        if (req.query.offset !== undefined) opts.offset = req.query.offset;
        if (req.query.limit !== undefined) opts.limit = req.query.limit;
        if (typeof req.query.search === 'string') opts.search = req.query.search;
        if (req.query.onlyUnpaid !== undefined) opts.onlyUnpaid = req.query.onlyUnpaid === 'true' || req.query.onlyUnpaid === '1';
        if (req.query.onlyUndelivered !== undefined) opts.onlyUndelivered = req.query.onlyUndelivered === 'true' || req.query.onlyUndelivered === '1';
        if (req.query.entityId !== undefined) opts.entityId = req.query.entityId;
        if (req.query.seekMonths !== undefined) opts.seekMonths = Number(req.query.seekMonths);

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

    /**
     * @openapi
     * /retoure/{id}:
     *   get:
     *     tags: [Retoure]
     *     summary: Get retoure by ID
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Retoure details
     *       404:
     *         description: Retoure not found
     */
    app.get(`${basePath}/retoure/:id`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

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

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

    /**
     * @openapi
     * /retoure:
     *   post:
     *     tags: [Retoure]
     *     summary: Create retoure
     *     security:
     *       - cookieAuth: []
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [date]
     *             properties:
     *               number:
     *                 type: string
     *               date:
     *                 type: string
     *               entityId:
     *                 type: integer
     *               externalNumber:
     *                 type: string
     *               lines:
     *                 type: array
     *     responses:
     *       201:
     *         description: Retoure created
     */
    app.post(`${basePath}/retoure`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

        try {
            const retoure = await db.create(req.user.id, req.body);
            emit('retoure', { companyId: companyCheck.companyId });
            res.status(201).json({ retoure });
        } catch (error) {
            const status = retoureErrorStatus(error);
            if (status === 500) console.error('Create retoure failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /retoure/{id}:
     *   put:
     *     tags: [Retoure]
     *     summary: Update retoure
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *     responses:
     *       200:
     *         description: Retoure updated
     */
    app.put(`${basePath}/retoure/:id`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

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

        try {
            const retoure = await db.update(req.user.id, id, req.body);
            emit('retoure', { companyId: companyCheck.companyId });
            res.status(200).json({ retoure });
        } catch (error) {
            const status = retoureErrorStatus(error);
            if (status === 500) console.error('Update retoure failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /retoure/{id}:
     *   delete:
     *     tags: [Retoure]
     *     summary: Delete retoure
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       204:
     *         description: Retoure deleted
     */
    app.delete(`${basePath}/retoure/:id`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

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

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

    /**
     * @openapi
     * /retoure/{id}/shipment:
     *   post:
     *     tags: [Retoure]
     *     summary: Create shipment for retoure
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       201:
     *         description: Shipment created
     */
    app.post(`${basePath}/retoure/:id/shipment`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

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

        try {
            const shipment = await db.createShipment(req.user.id, id, req.body);
            emit('retoure', { companyId: companyCheck.companyId });
            emit('shipment', { companyId: companyCheck.companyId });
            res.status(201).json({ shipment });
        } catch (error) {
            const status = retoureErrorStatus(error);
            if (status === 500) console.error('Create shipment for retoure failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /retoure/rebuild-summaries:
     *   post:
     *     tags: [Retoure]
     *     summary: Rebuild retoure summaries
     *     security:
     *       - cookieAuth: []
     *     responses:
     *       200:
     *         description: Summaries rebuilt
     */
    app.post(`${basePath}/retoure/rebuild-summaries`, async (req, res) => {
        const companyCheck = requireSelectedCompany(req);
        if (companyCheck.error) {
            return res.status(400).json({ error: companyCheck.error });
        }

        try {
            const result = await db.rebuildSummaries(req.user.id);
            res.status(200).json(result);
        } catch (error) {
            const status = retoureErrorStatus(error);
            if (status === 500) console.error('Rebuild retoure summaries failed:', error);
            res.status(status).json({ error: error.message });
        }
    });
}