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

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

function articleErrorStatus(error) {
    if (error.message === 'Not authorized') return 403;
    if (error.message === 'Parent not found') return 404;
    if (error.message === 'Article not found') return 404;
    if (error.message === 'Name required') return 400;
    return 500;
}

/**
 * Registers article routes (requires auth middleware).
 * @param {import('express').Application} app - Express app
 * @param {string} [basePath=''] - Optional URL prefix for all routes in this module
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /article:
     *   post:
     *     tags: [Article]
     *     summary: Create article
     *     description: Creates an article under an authorized category (`parentId`).
     *     security:
     *       - cookieAuth: []
     *     x-markdown: article/create.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [parentId, name]
     *             properties:
     *               parentId:
     *                 type: integer
     *                 description: Category id
     *               name:
     *                 type: string
     *             example:
     *               parentId: 10
     *               name: New article
     *     responses:
     *       201:
     *         description: Created
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 article:
     *                   $ref: '#/components/schemas/ArticleSummary'
     *       400:
     *         description: Validation error
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       401:
     *         description: Unauthorized
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       403:
     *         description: Not authorized for parent category
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Parent not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    app.post(`${basePath}/article`, async (req, res) => {
        const parent = parsePositiveInt(req.body?.parentId, 'parentId');
        if (parent.error) {
            return res.status(400).json({ error: parent.error });
        }

        const name = typeof req.body?.name === 'string' ? req.body.name.trim() : '';
        if (!name) {
            return res.status(400).json({ error: 'name is required' });
        }

        try {
            const article = await db.createUnderParent({
                googleAuthId: req.user.id,
                parentId: parent.id,
                name,
            });
            res.status(201).json({ article });
        } catch (error) {
            const status = articleErrorStatus(error);
            if (status === 500) console.error('Create article failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /article/{sku}:
     *   get:
     *     tags: [Article]
     *     summary: Get article by SKU
     *     description: Returns article detail by SKU if the user may access its category.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: article/get.md
     *     parameters:
     *       - in: path
     *         name: sku
     *         required: true
     *         schema:
     *           type: string
     *         description: Article SKU
     *     responses:
     *       200:
     *         description: Article detail
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 article:
     *                   $ref: '#/components/schemas/ArticleDetail'
     *       400:
     *         description: Missing sku
     *         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: Article not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   patch:
     *     tags: [Article]
     *     summary: Update article by SKU
     *     description: Updates an article name by SKU; returns the same detail shape as GET.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: article/update.md
     *     parameters:
     *       - in: path
     *         name: sku
     *         required: true
     *         schema:
     *           type: string
     *         description: Article SKU
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [name]
     *             properties:
     *               name:
     *                 type: string
     *             example:
     *               name: Updated name
     *     responses:
     *       200:
     *         description: Updated article detail
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 article:
     *                   $ref: '#/components/schemas/ArticleDetail'
     *       400:
     *         description: Validation error
     *         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: Article not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    app.get(`${basePath}/article/:sku`, async (req, res) => {
        const sku = typeof req.params.sku === 'string' ? req.params.sku.trim() : '';
        if (!sku) {
            return res.status(400).json({ error: 'sku is required' });
        }

        try {
            const article = await db.getBySku(req.user.id, decodeURIComponent(sku));
            res.status(200).json({ article });
        } catch (error) {
            const status = articleErrorStatus(error);
            if (status === 500) console.error('Get article by sku failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    app.patch(`${basePath}/article/:sku`, async (req, res) => {
        const sku = typeof req.params.sku === 'string' ? req.params.sku.trim() : '';
        if (!sku) {
            return res.status(400).json({ error: 'sku is required' });
        }

        const name = typeof req.body?.name === 'string' ? req.body.name.trim() : '';
        if (!name) {
            return res.status(400).json({ error: 'name is required' });
        }

        try {
            const article = await db.updateBySku(req.user.id, decodeURIComponent(sku), { name });
            res.status(200).json({ article });
        } catch (error) {
            const status = articleErrorStatus(error);
            if (status === 500) console.error('Update article by sku failed:', error);
            res.status(status).json({ error: error.message });
        }
    });
}