/*
	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, DiscordApiErrors, Guild, Member, Tag, Template } from "@spacebar/util";
import { Request, Response, Router } from "express";
import { HTTPError } from "lambert-server";
import { ChannelType, GuildTemplateCreateSchema } from "@spacebar/schemas";

const router: Router = Router({ mergeParams: true });

router.get(
    "/:template_code",
    route({
        responses: {
            200: {
                body: "Template",
            },
            403: {
                body: "APIErrorResponse",
            },
            404: {
                body: "APIErrorResponse",
            },
        },
    }),
    async (req: Request, res: Response) => {
        const { template_code } = req.params as { [key: string]: string };

        const template = await getTemplate(template_code);

        res.json(template);
    },
);

router.post("/:template_code", route({ requestBody: "GuildTemplateCreateSchema" }), async (req: Request, res: Response) => {
    const { template_code } = req.params as { [key: string]: string };
    const body = req.body as GuildTemplateCreateSchema;

    const { maxGuilds } = Config.get().limits.user;

    const guild_count = await Member.count({ where: { id: req.user_id } });
    if (guild_count >= maxGuilds) throw DiscordApiErrors.MAXIMUM_GUILDS.withParams(maxGuilds);

    const template = (await getTemplate(template_code)) as Template;

    const guild = await Guild.createGuild({
        ...template.serialized_source_guild,
        // body comes after the template
        ...body,
        owner_id: req.user_id,
        source_guild_id: template.source_guild_id,
    });

    await Member.addToGuild(req.user_id, guild.id);

    res.status(201).json({ id: guild.id });
});

async function getTemplate(code: string) {
    const { allowDiscordTemplates, allowRaws, enabled } = Config.get().templates;

    if (!enabled) throw new HTTPError("Template creation & usage is disabled on this instance.", 403);

    if (code.startsWith("discord:")) {
        if (!allowDiscordTemplates) throw new HTTPError("Discord templates cannot be used on this instance.", 403);

        const discordTemplateID = code.split("discord:", 2)[1];

        const discordTemplateData = await fetch(`https://discord.com/api/v9/guilds/templates/${discordTemplateID}`, {
            method: "get",
            headers: { "Content-Type": "application/json" },
        });

        const templateData = (await discordTemplateData.json()) as Template;

        // Role ID is position in new Discord template schema. Do a little converting.
        templateData.serialized_source_guild.roles.forEach((role) => {
            role.position = role.id as unknown as number;
        });

        templateData.serialized_source_guild.channels.forEach((channel) => {
            if (channel.type === ChannelType.GUILD_FORUM) {
                channel.available_tags =
                    channel.available_tags?.map((tag) =>
                        Tag.create({
                            name: tag.name,
                            emoji_id: tag.emoji_id,
                            emoji_name: tag.emoji_name,
                            moderated: tag.moderated,
                        }),
                    ) ?? [];
            }
        });

        return templateData;
    }

    if (code.startsWith("external:")) {
        if (!allowRaws) throw new HTTPError("Importing raws is disabled on this instance.", 403);

        return code.split("external:", 2)[1];
    }

    return await Template.findOneOrFail({
        where: { code: code },
    });
}

export default router;