import express from 'express';
import * as db from '../../db/attributevalue.js';
import { emit } from '../sse.js';

const AVIF_BODY_LIMIT = 10 * 1024 * 1024;

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

function attributeValueErrorStatus(error) {
    if (error.message === 'No company selected') return 400;
    if (error.message === 'Unsupported image format' || error.message?.includes('unsupported image format')) return 400;
    if (error.message === 'Not authorized') return 403;
    if (error.message === 'Company not found' || error.message === 'Attribute name not found' || error.message === 'Attribute value not found') return 404;
    if (error.message === 'Image not found') return 404;
    if (error.message === 'Value required') return 400;
    if (error.message === 'Invalid attribute value order') return 400;
    if (error.message === 'Invalid id' || error.message === 'Invalid attributeId') return 400;
    if (error.message === 'Attribute value already exists') return 409;
    if (error.message === 'Attribute value in use' || error.message?.includes('FOREIGN KEY constraint')) return 409;
    return 500;
}

/**
 * Registers attributevalue routes under `/attributename/:attributeId/value` and `/attributevalue/:id`.
 * @param {import('express').Application} app
 * @param {string} [basePath='']
 */
export function register(app, basePath = '') {
    /**
     * @openapi
     * /attributename/{attributeId}/value:
     *   get:
     *     tags: [Article]
     *     summary: List values for an attribute
     *     description: Lists all values for a specific attribute. Each value includes `articleCount` (the number of articles having this attribute value).
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: attributeId
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: List of attribute values
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 values:
     *                   type: array
     *                   items:
     *                     $ref: '#/components/schemas/AttributeValue'
     *   post:
     *     tags: [Article]
     *     summary: Create value for an attribute
     *     description: Adds a new predefined value to an attribute.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: attributeId
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [value]
     *             properties:
     *               value:
     *                 type: string
     *               sort:
     *                 type: integer
     *     responses:
     *       201:
     *         description: Created attribute value
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalue:
     *                   $ref: '#/components/schemas/AttributeValue'
     */
    app.get(`${basePath}/attributename/:attributeId/value`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const attributeId = Number(req.params.attributeId);
            const values = await db.listByAttributeId(req.user.id, attributeId);
            res.json({ values });
        } catch (error) {
            res.status(attributeValueErrorStatus(error)).json({ error: error.message });
        }
    });

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

        try {
            const attributeId = Number(req.params.attributeId);
            const attributevalue = await db.create(req.user.id, attributeId, req.body ?? {});
            emit('attributename', { companyId: selected.companyId });
            res.status(201).json({ attributevalue });
        } catch (error) {
            res.status(attributeValueErrorStatus(error)).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /attributename/{attributeId}/value/order:
     *   put:
     *     tags: [Article]
     *     summary: Reorder values of an attribute
     *     description: Updates the display sort order of values belonging to an attribute.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: attributeId
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             required: [attributevalueIds]
     *             properties:
     *               attributevalueIds:
     *                 type: array
     *                 items:
     *                   type: integer
     *     responses:
     *       200:
     *         description: Reordered successfully
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/SuccessResponse'
     */
    app.put(`${basePath}/attributename/:attributeId/value/order`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const attributeId = Number(req.params.attributeId);
            await db.order(req.user.id, attributeId, req.body ?? {});
            emit('attributename', { companyId: selected.companyId });
            res.json({ ok: true });
        } catch (error) {
            res.status(attributeValueErrorStatus(error)).json({ error: error.message });
        }
    });

    /**
     * @openapi
     * /attributevalue/{id}:
     *   patch:
     *     tags: [Article]
     *     summary: Update attribute value
     *     description: Updates value text and/or sort for an attribute value.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     requestBody:
     *       required: true
     *       content:
     *         application/json:
     *           schema:
     *             type: object
     *             properties:
     *               value:
     *                 type: string
     *               sort:
     *                 type: integer
     *     responses:
     *       200:
     *         description: Updated attribute value
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalue:
     *                   $ref: '#/components/schemas/AttributeValue'
     *   delete:
     *     tags: [Article]
     *     summary: Delete attribute value
     *     description: Deletes an attribute value and cascades to article assignments.
     *     security:
     *       - cookieAuth: []
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *     responses:
     *       200:
     *         description: Deleted successfully
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/SuccessResponse'
     *       400:
     *         description: Bad request 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: Forbidden
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       404:
     *         description: Attribute value not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       409:
     *         description: Attribute value in use
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *       500:
     *         description: Server error
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */
    app.patch(`${basePath}/attributevalue/:id`, async (req, res) => {
        const selected = requireSelectedCompany(req);
        if (selected.error) {
            return res.status(400).json({ error: selected.error });
        }

        try {
            const id = Number(req.params.id);
            const attributevalue = await db.update(req.user.id, id, req.body ?? {});
            emit('attributename', { companyId: selected.companyId });
            res.json({ attributevalue });
        } catch (error) {
            const status = attributeValueErrorStatus(error);
            if (status === 500) console.error('Update attribute value failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

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

        try {
            const id = Number(req.params.id);
            await db.remove(req.user.id, id);
            emit('attributename', { companyId: selected.companyId });
            res.json({ ok: true });
        } catch (error) {
            const status = attributeValueErrorStatus(error);
            const message = (error.message === 'Attribute value in use' || error.message?.includes('FOREIGN KEY constraint'))
                ? 'Attribute value in use'
                : error.message;
            if (status === 500) console.error('Delete attribute value failed:', error);
            res.status(status).json({ error: message });
        }
    });

    /**
     * @openapi
     * /attributevalue/{id}/image:
     *   post:
     *     tags: [Article]
     *     summary: Add or replace attribute value image
     *     description: |
     *       Uploads an image for the attribute value (AVIF, WebP, or octet-stream). Converted to AVIF full and thumbnail.
     *       Replaces any existing image for this attribute value. Emits SSE signal `attributename`.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [attributename]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Attribute value id
     *     requestBody:
     *       required: true
     *       content:
     *         image/avif:
     *           schema:
     *             type: string
     *             format: binary
     *         image/webp:
     *           schema:
     *             type: string
     *             format: binary
     *         application/octet-stream:
     *           schema:
     *             type: string
     *             format: binary
     *     responses:
     *       201:
     *         description: Image stored and linked
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalue:
     *                   type: object
     *                   properties:
     *                     id:
     *                       type: integer
     *                     fullHash:
     *                       type: string
     *                     thumbW:
     *                       type: integer
     *                     thumbH:
     *                       type: integer
     *                     thumbHash:
     *                       type: string
     *                     pics:
     *                       type: array
     *                       items:
     *                         $ref: '#/components/schemas/AttributeValuePic'
     *       400:
     *         description: Missing body or invalid image
     *         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: Attribute value not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     *   delete:
     *     tags: [Article]
     *     summary: Delete attribute value image
     *     description: Removes the attribute value's image. Sets thumbW, thumbH, thumbHash back to null. Emits SSE signal `attributename`.
     *     security:
     *       - cookieAuth: []
     *     x-signals: [attributename]
     *     parameters:
     *       - in: path
     *         name: id
     *         required: true
     *         schema:
     *           type: integer
     *         description: Attribute value id
     *     responses:
     *       200:
     *         description: Image removed
     *         content:
     *           application/json:
     *             schema:
     *               type: object
     *               properties:
     *                 attributevalue:
     *                   type: object
     *                   properties:
     *                     id:
     *                       type: integer
     *                     thumbW:
     *                       type: integer
     *                       nullable: true
     *                     thumbH:
     *                       type: integer
     *                       nullable: true
     *                     thumbHash:
     *                       type: string
     *                       nullable: true
     *                     pics:
     *                       type: array
     *                       items:
     *                         $ref: '#/components/schemas/AttributeValuePic'
     *       400:
     *         description: No company selected or invalid id
     *         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: Attribute value or image not found
     *         content:
     *           application/json:
     *             schema:
     *               $ref: '#/components/schemas/Error'
     */

    // #region POST /attributevalue/:id/image

    app.post(
        `${basePath}/attributevalue/:id/image`,
        express.raw({ type: ['image/avif', 'image/webp', 'application/octet-stream'], limit: AVIF_BODY_LIMIT }),
        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 imageBuffer = Buffer.isBuffer(req.body) ? req.body : null;
            if (!imageBuffer?.length) {
                return res.status(400).json({ error: 'AVIF or WebP image body is required' });
            }

            try {
                const attributevalue = await db.addImage(req.user.id, id, imageBuffer);
                emit('attributename', { companyId: selected.companyId });
                res.status(201).json({ attributevalue });
            } catch (error) {
                const status = attributeValueErrorStatus(error);
                if (status === 500) console.error('Add attribute value image failed:', error);
                res.status(status).json({ error: error.message });
            }
        }
    );

    // #endregion

    // #region DELETE /attributevalue/:id/image

    app.delete(`${basePath}/attributevalue/:id/image`, 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' });
        }

        try {
            const attributevalue = await db.deleteImage(req.user.id, id);
            emit('attributename', { companyId: selected.companyId });
            res.status(200).json({ attributevalue });
        } catch (error) {
            const status = attributeValueErrorStatus(error);
            if (status === 500) console.error('Delete attribute value image failed:', error);
            res.status(status).json({ error: error.message });
        }
    });

    // #endregion
}