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

// #region Helpers

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

function numberErrorStatus(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 === 'Number not found') return 404;
    if (error.message === 'Invalid number') return 400;
    return 500;
}

// #endregion

/**
 * Registers number-sequence routes for the authenticated user's selected company.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /number:
     *   get:
     *     tags: [Number]
     *     summary: List number sequences
     *     description: Lists the number sequences of the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: number/list.md
     *     responses:
     *       200:
     *         description: Number sequence list
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 numbers:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/NumberSequence'
     *       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'
     */
    // #region GET /number

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

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

    // #endregion

    /**
     * @openapi
     * /number/{id}:
     *   patch:
     *     tags: [Number]
     *     summary: Update number sequence
     *     description: |
     *       Updates sequence settings for the selected company. Only provided fields
     *       are changed (`prefix`, `padding`, `next`). `prefix` is trimmed and must
     *       be at most 50 characters. `padding` must be an integer `>= 0`. `next`
     *       must be an integer `>= 1`. If no field is provided, the row is returned
     *       unchanged.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: number/update.md
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               prefix:
     *                 type: string
     *               padding:
     *                 type: integer
     *                 minimum: 0
     *               next:
     *                 type: integer
     *                 minimum: 1
     *             example:
     *               prefix: 'A-'
     *               padding: 4
     *               next: 100
     *     responses:
     *       200:
     *         description: Updated number sequence
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 number:
     *                   $ref: '#/components/schemas/NumberSequence'
     *       400:
     *         description: Invalid number, 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: Number sequence or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PATCH /number/:id

    app.patch(`${basePath}/number/: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 input = {};
        if (Object.prototype.hasOwnProperty.call(body, 'prefix')) {
            input.prefix = body.prefix;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'padding')) {
            input.padding = body.padding;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'next')) {
            input.next = body.next;
        }

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

    // #endregion
}