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

// #region Helpers

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

function contactErrorStatus(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 === 'Entity not found') return 404;
    if (error.message === 'Contact not found') return 404;
    if (error.message === 'Contact required') return 400;
    return 500;
}

// #endregion

/**
 * Registers entity contact routes nested under `/entity/:entityId/contact`.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /entity/{entityId}/contact:
     *   get:
     *     tags: [Entity]
     *     summary: List entity contacts
     *     description: Lists contacts for an entity of the selected company (`contactType` e.g. `email`, `phone`).
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/contact/list.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Contact list
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 contacts:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/EntityContact'
     *       400:
     *         description: No company selected or invalid entityId
     *         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: Entity or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   post:
     *     tags: [Entity]
     *     summary: Create entity contact
     *     description: Creates a contact for the entity. `contactType` and `contact` are required.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/contact/create.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [contactType, contact]
     *             properties:
     *               contactType:
     *                 type: string
     *                 description: e.g. email, phone
     *               contact:
     *                 type: string
     *             example:
     *               contactType: email
     *               contact: anna@example.com
     *     responses:
     *       201:
     *         description: Created contact
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 contact:
     *                   $ref: '#/components/schemas/EntityContact'
     *       400:
     *         description: Contact required, invalid entityId, 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: Entity or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region GET /entity/:entityId/contact

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

        const entityId = Number(req.params.entityId);
        if (!Number.isInteger(entityId) || entityId <= 0) {
            return res.status(400).json({ error: 'entityId is required' });
        }

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

    // #endregion

    // #region POST /entity/:entityId/contact

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

        const entityId = Number(req.params.entityId);
        if (!Number.isInteger(entityId) || entityId <= 0) {
            return res.status(400).json({ error: 'entityId is required' });
        }

        const { contactType, contact } = req.body ?? {};

        try {
            const row = await db.create(req.user.id, entityId, {
                contactType,
                contact,
            });
            res.status(201).json({ contact: row });
        } catch (error) {
            const status = contactErrorStatus(error);
            if (status === 500) console.error('Create entity contact failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    /**
     * @openapi
     * /entity/{entityId}/contact/{id}:
     *   patch:
     *     tags: [Entity]
     *     summary: Update entity contact
     *     description: Patches `contactType` and/or `contact`.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/contact/update.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               contactType:
     *                 type: string
     *               contact:
     *                 type: string
     *             example:
     *               contact: anna.mueller@example.com
     *     responses:
     *       200:
     *         description: Updated contact
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 contact:
     *                   $ref: '#/components/schemas/EntityContact'
     *       400:
     *         description: Contact required, invalid ids, 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: Contact, entity, or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   delete:
     *     tags: [Entity]
     *     summary: Delete entity contact
     *     description: Deletes one contact of the entity.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/contact/delete.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       204:
     *         description: Deleted
     *       400:
     *         description: No company selected or invalid ids
     *         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: Contact or entity not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PATCH /entity/:entityId/contact/:id

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

        const entityId = Number(req.params.entityId);
        const id = Number(req.params.id);
        if (!Number.isInteger(entityId) || entityId <= 0) {
            return res.status(400).json({ error: 'entityId is required' });
        }
        if (!Number.isInteger(id) || id <= 0) {
            return res.status(400).json({ error: 'id is required' });
        }

        const body = req.body ?? {};
        const patch = {};
        if (Object.prototype.hasOwnProperty.call(body, 'contactType')) {
            patch.contactType = body.contactType;
        }
        if (Object.prototype.hasOwnProperty.call(body, 'contact')) {
            patch.contact = body.contact;
        }

        try {
            const row = await db.update(req.user.id, entityId, id, patch);
            res.status(200).json({ contact: row });
        } catch (error) {
            const status = contactErrorStatus(error);
            if (status === 500) console.error('Update entity contact failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    // #region DELETE /entity/:entityId/contact/:id

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

        const entityId = Number(req.params.entityId);
        const id = Number(req.params.id);
        if (!Number.isInteger(entityId) || entityId <= 0) {
            return res.status(400).json({ error: 'entityId is required' });
        }
        if (!Number.isInteger(id) || id <= 0) {
            return res.status(400).json({ error: 'id is required' });
        }

        try {
            await db.remove(req.user.id, entityId, id);
            res.sendStatus(204);
        } catch (error) {
            const status = contactErrorStatus(error);
            if (status === 500) console.error('Delete entity contact failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion
}