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

// #region Helpers

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

function addressErrorStatus(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 === 'Address not found') return 404;
    if (error.message === 'Address type required') return 400;
    return 500;
}

const ADDRESS_FIELDS = [
    'addressType',
    'firstName',
    'name',
    'street',
    'streetNumber',
    'zip',
    'city',
    'county',
];

// #endregion

/**
 * Registers entity address routes nested under `/entity/:entityId/address`.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /entity/{entityId}/address:
     *   get:
     *     tags: [Entity]
     *     summary: List entity addresses
     *     description: Lists addresses for an entity of the selected company.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/address/list.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Address list
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 addresses:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/EntityAddress'
     *       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 address
     *     description: Creates an address for the entity. `addressType` is required.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/address/create.md
     *     parameters:
     *       - in: path
     *         name: entityId
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [addressType]
     *             properties:
     *               addressType:
     *                 type: string
     *               firstName:
     *                 type: string
     *                 nullable: true
     *               name:
     *                 type: string
     *                 nullable: true
     *               street:
     *                 type: string
     *                 nullable: true
     *               streetNumber:
     *                 type: string
     *                 nullable: true
     *               zip:
     *                 type: string
     *                 nullable: true
     *               city:
     *                 type: string
     *                 nullable: true
     *               county:
     *                 type: string
     *                 nullable: true
     *             example:
     *               addressType: billing
     *               street: Hauptstraße
     *               streetNumber: '12'
     *               zip: '10115'
     *               city: Berlin
     *     responses:
     *       201:
     *         description: Created address
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 address:
     *                   $ref: '#/components/schemas/EntityAddress'
     *       400:
     *         description: Address type 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/address

    app.get(`${basePath}/entity/:entityId/address`, 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 addresses = await db.list(req.user.id, entityId);
            res.status(200).json({ addresses });
        } catch (error) {
            const status = addressErrorStatus(error);
            if (status === 500) console.error('List entity addresses failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion

    // #region POST /entity/:entityId/address

    app.post(`${basePath}/entity/:entityId/address`, 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 body = req.body ?? {};
        const data = {};
        for (const key of ADDRESS_FIELDS) {
            if (Object.prototype.hasOwnProperty.call(body, key)) {
                data[key] = body[key];
            }
        }

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

    // #endregion

    /**
     * @openapi
     * /entity/{entityId}/address/{id}:
     *   patch:
     *     tags: [Entity]
     *     summary: Update entity address
     *     description: Patches address fields that are present.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/address/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:
     *               addressType:
     *                 type: string
     *               firstName:
     *                 type: string
     *                 nullable: true
     *               name:
     *                 type: string
     *                 nullable: true
     *               street:
     *                 type: string
     *                 nullable: true
     *               streetNumber:
     *                 type: string
     *                 nullable: true
     *               zip:
     *                 type: string
     *                 nullable: true
     *               city:
     *                 type: string
     *                 nullable: true
     *               county:
     *                 type: string
     *                 nullable: true
     *             example:
     *               city: München
     *               zip: '80331'
     *     responses:
     *       200:
     *         description: Updated address
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 address:
     *                   $ref: '#/components/schemas/EntityAddress'
     *       400:
     *         description: Address type 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: Address, entity, or company not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   delete:
     *     tags: [Entity]
     *     summary: Delete entity address
     *     description: Deletes one address of the entity.
     *     security:
     *       - cookieAuth: []
     *     x-markdown: entity/address/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: Address or entity not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    // #region PATCH /entity/:entityId/address/:id

    app.patch(`${basePath}/entity/:entityId/address/: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 = {};
        for (const key of ADDRESS_FIELDS) {
            if (Object.prototype.hasOwnProperty.call(body, key)) {
                patch[key] = body[key];
            }
        }

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

    // #endregion

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

    app.delete(`${basePath}/entity/:entityId/address/: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 = addressErrorStatus(error);
            if (status === 500) console.error('Delete entity address failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion
}