/*
	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, Index, JoinColumn, ManyToOne, RelationId } from "typeorm";
import { BaseClass } from "./BaseClass";
import { Channel } from "./Channel";
import { User } from "./User";

// for read receipts
// notification cursor and public read receipt need to be forwards-only (the former to prevent re-pinging when marked as unread, and the latter to be acceptable as a legal acknowledgement in criminal proceedings), and private read marker needs to be advance-rewind capable
// public read receipt ≥ notification cursor ≥ private fully read marker

@Entity("read_states")
@Index(["channel_id", "user_id"], { unique: true })
export class ReadState extends BaseClass {
	@Column()
	@RelationId((read_state: ReadState) => read_state.channel)
	channel_id: string;

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

	@Column()
	@RelationId((read_state: ReadState) => read_state.user)
	user_id: string;

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

	// fully read marker
	@Column({ nullable: true })
	last_message_id: string;

	// public read receipt
	@Column({ nullable: true })
	public_ack: string;

	// notification cursor / private read receipt
	@Column({ nullable: true })
	notifications_cursor: string;

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

	@Column({ nullable: true })
	mention_count: number;

	// @Column({ nullable: true })
	// TODO: derive this from (last_message_id=notifications_cursor=public_ack)=true
	manual: boolean;
}