import * as db from '../../db/printer.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 parsePositiveInt(value, field) {
    const id = Number(value);
    if (!Number.isInteger(id) || id <= 0) {
        return { error: `${field} is required` };
    }
    return { id };
}

function printerErrorStatus(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 === 'Printer not found') return 404;
    if (error.message === 'Address required') return 400;
    if (error.message?.startsWith('Invalid printer type')) return 400;
    if (error.message === 'Invalid sort') return 400;
    if (error.message === 'Invalid printer order') return 400;
    return 500;
}

// #endregion

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

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

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

    // #endregion

    /**
     * @openapi
     * /printer/order:
     *   put:
     *     tags: [Printer]
     *     summary: Reorder printers
     *     description: |
     *       Reorders printers for the selected company.
     *       `printerIds` must include all existing printer IDs exactly once.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [printer]
     *     x-markdown: printer/order.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [printerIds]
     *             properties:
     *               printerIds:
     *                 type: array
     *                 items:
     *                   type: integer
     *     responses:
     *       200:
     *         description: Applied printer order
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 printerIds:
     *                   type: array
     *                   items:
     *                     type: integer
     *       400:
     *         description: Invalid printer order 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'
     */
    // #region PUT /printer/order

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

        const { printerIds } = req.body ?? {};

        try {
            const result = await db.order(req.user.id, { printerIds });
            emit('printer', { companyId: selected.companyId });
            res.status(200).json(result);
        } catch (error) {
            const status = printerErrorStatus(error);
            if (status === 500) console.error('Order printers failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /printer/{id}:
     *   get:
     *     tags: [Printer]
     *     summary: Get printer by ID
     *     description: Retrieves a single printer for the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Printer ID
     *     x-markdown: printer/get.md
     *     responses:
     *       200:
     *         description: Printer details
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 printer:
     *                   $ref: '#/components/schemas/Printer'
     *       400:
     *         description: 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: Printer not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region GET /printer/:id

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

        const parsedId = parsePositiveInt(req.params.id, 'id');
        if (parsedId.error) {
            return res.status(400).json({ error: parsedId.error });
        }

        try {
            const printer = await db.getById(req.user.id, parsedId.id);
            if (!printer) {
                return res.status(404).json({ error: 'Printer not found' });
            }
            res.status(200).json({ printer });
        } catch (error) {
            const status = printerErrorStatus(error);
            if (status === 500) console.error('Get printer failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /printer:
     *   post:
     *     tags: [Printer]
     *     summary: Create printer
     *     description: |
     *       Creates a new printer for the selected company.
     *       `type` must be `"esc/pos"` (lines), `"zpl"` (pages), or `"ipp"`.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [printer]
     *     x-markdown: printer/create.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/PrinterCreateInput'
     *     responses:
     *       201:
     *         description: Created printer
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 printer:
     *                   $ref: '#/components/schemas/Printer'
     *       400:
     *         description: Invalid input or missing fields
     *         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'
     */
    // #region POST /printer

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

        const { address, type, model, serial, sort, desc } = req.body ?? {};

        try {
            const printer = await db.create(req.user.id, {
                address,
                type,
                model,
                serial,
                sort,
                desc,
            });
            emit('printer', { companyId: selected.companyId });
            res.status(201).json({ printer });
        } catch (error) {
            const status = printerErrorStatus(error);
            if (status === 500) console.error('Create printer failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    async function handleUpdate(req, res) {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        const parsedId = parsePositiveInt(req.params.id, 'id');
        if (parsedId.error) {
            return res.status(400).json({ error: parsedId.error });
        }

        const { address, type, model, serial, sort, desc } = req.body ?? {};

        try {
            const printer = await db.update(req.user.id, parsedId.id, {
                address,
                type,
                model,
                serial,
                sort,
                desc,
            });
            emit('printer', { companyId: selected.companyId });
            res.status(200).json({ printer });
        } catch (error) {
            const status = printerErrorStatus(error);
            if (status === 500) console.error('Update printer failed:', error);
            res.status(status).json({ error: error.message });
        }
    }

    /**
     * @openapi
     * /printer/{id}:
     *   patch:
     *     tags: [Printer]
     *     summary: Update printer (partial)
     *     description: Updates specified fields of an existing printer for the selected company.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [printer]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Printer ID
     *     x-markdown: printer/update.md
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/PrinterUpdateInput'
     *     responses:
     *       200:
     *         description: Updated printer
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 printer:
     *                   $ref: '#/components/schemas/Printer'
     *       400:
     *         description: Invalid input
     *         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: Printer not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   put:
     *     tags: [Printer]
     *     summary: Update printer
     *     description: Updates specified fields of an existing printer for the selected company.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [printer]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Printer ID
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             $ref: '#/components/schemas/PrinterUpdateInput'
     *     responses:
     *       200:
     *         description: Updated printer
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 printer:
     *                   $ref: '#/components/schemas/Printer'
     *       400:
     *         description: Invalid input
     *         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: Printer not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PATCH /printer/:id

    app.patch(`${basePath}/printer/:id`, handleUpdate);

    // #endregion

    // #region PUT /printer/:id

    app.put(`${basePath}/printer/:id`, handleUpdate);

    // #endregion

    /**
     * @openapi
     * /printer/{id}:
     *   delete:
     *     tags: [Printer]
     *     summary: Delete printer
     *     description: Deletes a printer for the authenticated user's selected company.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [printer]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Printer ID
     *     x-markdown: printer/delete.md
     *     responses:
     *       204:
     *         description: Printer deleted
     *       400:
     *         description: 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: Printer not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region DELETE /printer/:id

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

        const parsedId = parsePositiveInt(req.params.id, 'id');
        if (parsedId.error) {
            return res.status(400).json({ error: parsedId.error });
        }

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

    // #endregion
}