/*
	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 { Column, Entity, JoinColumn, ManyToOne, RelationId } from "typeorm";
import { BaseClassWithoutId, PrimaryIdColumn } from "./BaseClass";
import { Channel } from "./Channel";
import { Guild } from "./Guild";
import { Member } from "./Member";
import { User } from "./User";

export const PublicInviteRelation = ["inviter", "guild", "channel"];

@Entity({
    name: "invites",
})
export class Invite extends BaseClassWithoutId {
    @PrimaryIdColumn()
    code: string;

    @Column()
    temporary: boolean;

    @Column()
    uses: number;

    @Column()
    max_uses: number;

    @Column()
    max_age: number;

    @Column()
    created_at: Date;

    @Column({ nullable: true })
    expires_at?: Date;

    @Column({ nullable: true })
    @RelationId((invite: Invite) => invite.guild)
    guild_id: string;

    @JoinColumn({ name: "guild_id" })
    @ManyToOne(() => Guild, (guild) => guild.invites, {
        onDelete: "CASCADE",
    })
    guild: Guild;

    @Column({ nullable: true })
    @RelationId((invite: Invite) => invite.channel)
    channel_id: string;

    @JoinColumn({ name: "channel_id" })
    @ManyToOne(() => Channel, {
        onDelete: "CASCADE",
    })
    channel: Channel;

    @Column({ nullable: true })
    @RelationId((invite: Invite) => invite.inviter)
    inviter_id?: string;

    @JoinColumn({ name: "inviter_id" })
    @ManyToOne(() => User, {
        onDelete: "CASCADE",
    })
    inviter: User;

    @Column({ nullable: true })
    @RelationId((invite: Invite) => invite.target_user)
    target_user_id: string;

    @JoinColumn({ name: "target_user_id" })
    @ManyToOne(() => User, {
        onDelete: "CASCADE",
    })
    target_user?: string; // could be used for "User specific invites" https://github.com/spacebarchat/server/issues/326

    @Column({ nullable: true })
    target_user_type?: number;

    @Column({ nullable: true })
    vanity_url?: boolean;

    @Column()
    flags: number;

    isExpired() {
        if (this.max_age !== 0 && this.expires_at && this.expires_at < new Date()) return true;
        if (this.max_uses !== 0 && this.uses >= this.max_uses) return true;
        return false;
    }

    static async joinGuild(user_id: string, code: string) {
        const invite = await Invite.findOneOrFail({ where: { code } });
        if (invite.isExpired()) {
            await Invite.delete({ code });
            throw new Error("Invite is expired");
        }
        if (invite.uses++ >= invite.max_uses && invite.max_uses !== 0) await Invite.delete({ code });
        else await invite.save();

        await Member.addToGuild(user_id, invite.guild_id);
        return invite;
    }
}