/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2025 Spacebar and Spacebar Contributors
	
	This program is free software: you can redistribute it and/or modify
	it under the terms of the GNU Affero General Public License as published
	by the Free Software Foundation, either version 3 of the License, or
	(at your option) any later version.
	
	This program is distributed in the hope that it will be useful,
	but WITHOUT ANY WARRANTY; without even the implied warranty of
	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
	GNU Affero General Public License for more details.
	
	You should have received a copy of the GNU Affero General Public License
	along with this program.  If not, see <https://www.gnu.org/licenses/>.
*/

import { route } from "@spacebar/api";
import { Config, Message } from "@spacebar/util";
import { Request, Response, Router } from "express";
import { PreloadMessagesRequestSchema, PreloadMessagesResponseSchema } from "@spacebar/schemas";
const router = Router({ mergeParams: true });

router.post(
    "/",
    route({
        requestBody: "PreloadMessagesRequestSchema",
        responses: {
            200: {
                body: "PreloadMessagesResponse",
            },
            400: {
                body: "APIErrorResponse",
            },
        },
    }),
    async (req: Request, res: Response) => {
        const body = req.body as PreloadMessagesRequestSchema;
        body.channels ??= body.channel_ids ?? [];
        if (body.channels.length > Config.get().limits.message.maxPreloadCount)
            return res.status(400).send({
                code: 400,
                message: `Cannot preload more than ${Config.get().limits.message.maxPreloadCount} channels at once.`,
            });

        const messages = (
            await Promise.all(
                body.channels.map((channelId) =>
                    Message.findOne({
                        where: { channel_id: channelId },
                        order: { timestamp: "DESC" },
                    }),
                ),
            )
        ).filter((x) => x !== null) as Message[];

        const filteredMessages = messages.map((message) => {
            const x = message.toJSON();
            // https://docs.discord.food/resources/message#preload-messages - reactions are not included in the response
            x.reactions = undefined;
            return x;
        }) as unknown as PreloadMessagesResponseSchema;

        return res.status(200).send(filteredMessages);
    },
);

export default router;