/*
	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/>.
*/

/* eslint-disable @typescript-eslint/ban-ts-comment */

import { route } from "@spacebar/api";
import { Channel, FieldErrors, Message, getPermission } from "@spacebar/util";
import { Request, Response, Router } from "express";
import { HTTPError } from "lambert-server";
import { FindManyOptions, In, Like } from "typeorm";

const router: Router = Router();

router.get(
	"/",
	route({
		responses: {
			200: {
				body: "GuildMessagesSearchResponse",
			},
			403: {
				body: "APIErrorResponse",
			},
			422: {
				body: "APIErrorResponse",
			},
		},
	}),
	async (req: Request, res: Response) => {
		const {
			channel_id,
			content,
			// include_nsfw, // TODO
			offset,
			sort_order,
			// sort_by, // TODO: Handle 'relevance'
			limit,
			author_id,
		} = req.query;

		const parsedLimit = Number(limit) || 50;
		if (parsedLimit < 1 || parsedLimit > 100)
			throw new HTTPError("limit must be between 1 and 100", 422);

		if (sort_order) {
			if (
				typeof sort_order != "string" ||
				["desc", "asc"].indexOf(sort_order) == -1
			)
				throw FieldErrors({
					sort_order: {
						message: "Value must be one of ('desc', 'asc').",
						code: "BASE_TYPE_CHOICES",
					},
				}); // todo this is wrong
		}

		const permissions = await getPermission(
			req.user_id,
			req.params.guild_id,
			channel_id as string | undefined,
		);
		permissions.hasThrow("VIEW_CHANNEL");
		if (!permissions.has("READ_MESSAGE_HISTORY"))
			return res.json({ messages: [], total_results: 0 });

		const query: FindManyOptions<Message> = {
			order: {
				timestamp: sort_order
					? (sort_order.toUpperCase() as "ASC" | "DESC")
					: "DESC",
			},
			take: parsedLimit || 0,
			where: {
				guild: {
					id: req.params.guild_id,
				},
			},
			relations: [
				"author",
				"webhook",
				"application",
				"mentions",
				"mention_roles",
				"mention_channels",
				"sticker_items",
				"attachments",
			],
			skip: offset ? Number(offset) : 0,
		};
		//@ts-ignore
		if (channel_id) query.where.channel = { id: channel_id };
		else {
			// get all channel IDs that this user can access
			const channels = await Channel.find({
				where: { guild_id: req.params.guild_id },
				select: ["id"],
			});
			const ids = [];

			for (const channel of channels) {
				const perm = await getPermission(
					req.user_id,
					req.params.guild_id,
					channel.id,
				);
				if (
					!perm.has("VIEW_CHANNEL") ||
					!perm.has("READ_MESSAGE_HISTORY")
				)
					continue;
				ids.push(channel.id);
			}

			//@ts-ignore
			query.where.channel = { id: In(ids) };
		}
		//@ts-ignore
		if (author_id) query.where.author = { id: author_id };
		//@ts-ignore
		if (content) query.where.content = Like(`%${content}%`);

		const messages: Message[] = await Message.find(query);

		const messagesDto = messages.map((x) => [
			{
				id: x.id,
				type: x.type,
				content: x.content,
				channel_id: x.channel_id,
				author: {
					id: x.author?.id,
					username: x.author?.username,
					avatar: x.author?.avatar,
					avatar_decoration: null,
					discriminator: x.author?.discriminator,
					public_flags: x.author?.public_flags,
				},
				attachments: x.attachments,
				embeds: x.embeds,
				mentions: x.mentions,
				mention_roles: x.mention_roles,
				pinned: x.pinned,
				mention_everyone: x.mention_everyone,
				tts: x.tts,
				timestamp: x.timestamp,
				edited_timestamp: x.edited_timestamp,
				flags: x.flags,
				components: x.components,
				hit: true,
			},
		]);

		return res.json({
			messages: messagesDto,
			total_results: messages.length,
		});
	},
);

export default router;