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

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

function parseSku(value) {
    const sku = typeof value === 'string' ? value.trim() : '';
    if (!sku) return { error: 'sku is required' };
    return { sku: decodeURIComponent(sku) };
}

function emitArticleSignal(req, sku) {
    const companyId = req.user?.selectedCompanyId;
    if (companyId == null) return;
    emit(`article-${sku}`, { companyId });
}

function articleAttributeValueErrorStatus(error) {
    if (error.message === 'No company selected') return 400;
    if (error.message === 'Not authorized') return 403;
    if (error.message === 'Company not found' || error.message === 'Article not found') return 404;
    if (error.message?.startsWith('Attribute value not found')) return 404;
    if (error.message?.includes('exclusive')) return 400;
    if (error.message?.includes('parent article') || error.message?.includes('Child article must have')) return 400;
    if (error.message === 'Invalid attribute values array' || error.message === 'Invalid attributeValueId' || error.message === 'Duplicate attributeValueId') return 400;
    return 500;
}

/**
 * Registers articleattributevalue routes under `/article/:sku/attributevalue`.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /article/{sku}/attributevalue:
     *   get:
     *     tags: [Article]
     *     summary: List article attribute values
     *     description: Fetches all attribute values assigned to an article.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: sku
     *         required: true
     *         schema:
     *           type: string
     *         description: Article SKU
     *     responses:
     *       200:
     *         description: List of attribute values assigned to this article
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalues:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/ArticleAttributeValue'
     *   put:
     *     tags: [Article]
     *     summary: Bulk set article attribute values
     *     description: Replaces all attribute values for an article. Enforces exclusive constraint (max one value per exclusive attribute).
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: sku
     *         required: true
     *         schema:
     *           type: string
     *         description: Article SKU
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: array
     *             description: Array of attribute value IDs. Array order defines sort.
     *             items:
     *               type: integer
     *             example: [166]
     *     responses:
     *       200:
     *         description: Updated article attribute values
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalues:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/ArticleAttributeValue'
     */
    app.get(`${basePath}/article/:sku/attributevalue`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const skuParsed = parseSku(req.params.sku);
        if (skuParsed.error) {
            return res.status(400).json({ error: skuParsed.error });
        }

        try {
            const attributevalues = await db.listByArticleSku(req.user.id, skuParsed.sku);
            res.json({ attributevalues });
        } catch (error) {
            res.status(articleAttributeValueErrorStatus(error)).json({ error: error.message });
        }
    });

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

        const skuParsed = parseSku(req.params.sku);
        if (skuParsed.error) {
            return res.status(400).json({ error: skuParsed.error });
        }

        if (!Array.isArray(req.body)) return res.status(400).json({ error: 'attributevalues array required' });

        try {
            const attributevalues = await db.setByArticleSku(req.user.id, skuParsed.sku, req.body);
            emitArticleSignal(req, skuParsed.sku);
            res.json({ attributevalues });
        } catch (error) {
            res.status(articleAttributeValueErrorStatus(error)).json({ error: error.message });
        }
    });
}