/*
	Spacebar: A FOSS re-implementation and extension of the Discord.com backend.
	Copyright (C) 2023 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 { Channel, DiscordApiErrors, Guild, GuildUpdateEvent, Member, Permissions, SpacebarApiErrors, emitEvent, getPermission, getRights, handleFile } from "@spacebar/util";
import { Request, Response, Router } from "express";
import { HTTPError } from "lambert-server";
import { GuildUpdateSchema } from "@spacebar/schemas";

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

router.get(
    "/",
    route({
        responses: {
            "200": {
                body: "APIGuildWithJoinedAt",
            },
            401: {
                body: "APIErrorResponse",
            },
            404: {
                body: "APIErrorResponse",
            },
        },
    }),
    async (req: Request, res: Response) => {
        const { guild_id } = req.params as { [key: string]: string };

        const [guild, member] = await Promise.all([Guild.findOneOrFail({ where: { id: guild_id } }), Member.findOne({ where: { guild_id: guild_id, id: req.user_id } })]);
        if (!member) throw new HTTPError("You are not a member of the guild you are trying to access", 401);

        return res.send({
            ...guild,
            joined_at: member?.joined_at,
        });
    },
);

router.patch(
    "/",
    route({
        requestBody: "GuildUpdateSchema",
        permission: "MANAGE_GUILD",
        responses: {
            200: {
                body: "GuildCreateResponse",
            },
            401: {
                body: "APIErrorResponse",
            },
            403: {
                body: "APIErrorResponse",
            },
            404: {
                body: "APIErrorResponse",
            },
        },
    }),
    async (req: Request, res: Response) => {
        const body = req.body as GuildUpdateSchema;
        const { guild_id } = req.params as { [key: string]: string };

        const rights = await getRights(req.user_id);
        const permission = await getPermission(req.user_id, guild_id);

        if (!rights.has("MANAGE_GUILDS") && !permission.has("MANAGE_GUILD")) throw DiscordApiErrors.MISSING_PERMISSIONS.withParams("MANAGE_GUILDS");

        const guild = await Guild.findOneOrFail({
            where: { id: guild_id },
            relations: { emojis: true, roles: true, stickers: true },
        });

        // trying to `select` this fails
        guild.channel_ordering = (
            await Guild.findOneOrFail({
                where: { id: guild_id },
                select: { channel_ordering: true },
            })
        ).channel_ordering;

        // TODO: guild update check image

        if (body.icon && body.icon != guild.icon) body.icon = await handleFile(`/icons/${guild_id}`, body.icon);

        if (body.banner && body.banner !== guild.banner) body.banner = await handleFile(`/banners/${guild_id}`, body.banner);

        if (body.splash && body.splash !== guild.splash) body.splash = await handleFile(`/splashes/${guild_id}`, body.splash);

        if (body.discovery_splash && body.discovery_splash !== guild.discovery_splash)
            body.discovery_splash = await handleFile(`/discovery-splashes/${guild_id}`, body.discovery_splash);

        if (body.features) {
            const diff = guild.features.filter((x) => !body.features?.includes(x)).concat(body.features.filter((x) => !guild.features.includes(x)));

            // TODO move these
            const MUTABLE_FEATURES = ["COMMUNITY", "INVITES_DISABLED", "DISCOVERABLE"];

            for (const feature of diff) {
                if (MUTABLE_FEATURES.includes(feature)) continue;

                throw SpacebarApiErrors.FEATURE_IS_IMMUTABLE.withParams(feature);
            }

            // for some reason, they don't update in the assign.
            guild.features = body.features;
        }

        // TODO: check if body ids are valid
        guild.assign(body);

        if (body.public_updates_channel_id == "1") {
            // create an updates channel for them
            const channel = await Channel.createChannel(
                {
                    name: "moderator-only",
                    guild_id: guild.id,
                    position: 0,
                    type: 0,
                    permission_overwrites: [
                        // remove SEND_MESSAGES from @everyone
                        {
                            id: guild.id,
                            allow: "0",
                            deny: Permissions.FLAGS.VIEW_CHANNEL.toString(),
                            type: 0,
                        },
                    ],
                },
                undefined,
                { skipPermissionCheck: true },
            );

            await Guild.insertChannelInOrder(guild.id, channel.id, 0, guild);

            guild.public_updates_channel_id = channel.id;
        } else if (body.public_updates_channel_id != undefined) {
            // ensure channel exists in this guild
            await Channel.findOneOrFail({
                where: { guild_id, id: body.public_updates_channel_id },
                select: { id: true },
            });
        }

        if (body.rules_channel_id == "1") {
            // create a rules for them
            const channel = await Channel.createChannel(
                {
                    name: "rules",
                    guild_id: guild.id,
                    position: 0,
                    type: 0,
                    permission_overwrites: [
                        // remove SEND_MESSAGES from @everyone
                        {
                            id: guild.id,
                            allow: "0",
                            deny: Permissions.FLAGS.SEND_MESSAGES.toString(),
                            type: 0,
                        },
                    ],
                },
                undefined,
                { skipPermissionCheck: true },
            );

            await Guild.insertChannelInOrder(guild.id, channel.id, 0, guild);

            guild.rules_channel_id = channel.id;
        } else if (body.rules_channel_id != undefined) {
            // ensure channel exists in this guild
            await Channel.findOneOrFail({
                where: { guild_id, id: body.rules_channel_id },
                select: { id: true },
            });
        }

        const data = guild.toJSON();
        // TODO: guild hashes
        // TODO: fix vanity_url_code, template_id
        // delete data.vanity_url_code;
        delete data.template_id;

        await Promise.all([
            guild.save(),
            emitEvent({
                event: "GUILD_UPDATE",
                data,
                guild_id,
            } as GuildUpdateEvent),
        ]);

        return res.json(data);
    },
);

export default router;
