import type { Session } from '../Session.ts';
import type { DiscordMemberWithUser, DiscordMessageReactionAdd, DiscordReaction } from '../../discordeno/mod.ts';
import Emoji from './Emoji.ts';
import Member from './Member.ts';

/**
 * Represents when a new reaction was added to a message.
 * @link https://discord.com/developers/docs/topics/gateway#message-reaction-add
 */
export interface MessageReactionAdd {
    userId: string;
    channelId: string;
    messageId: string;
    guildId?: string;
    member?: Member;
    emoji: Partial<Emoji>;
}

/**
 * Represents when a reaction was removed from a message.
 * Equal to MessageReactionAdd but without 'member' property.
 * @see {@link MessageReactionAdd}
 * @link https://discord.com/developers/docs/topics/gateway#message-reaction-remove-message-reaction-remove-event-fields
 */
export type MessageReactionRemove = Omit<MessageReactionAdd, 'member'>;

/**
 * Represents when all reactions were removed from a message.
 * Equals to MessageReactionAdd but with 'channelId', 'messageId' and 'guildId' properties guaranteed.
 * @see {@link MessageReactionAdd}
 * @link https://discord.com/developers/docs/topics/gateway#message-reaction-remove-all
 */
export type MessageReactionRemoveAll = Pick<MessageReactionAdd, 'channelId' | 'messageId' | 'guildId'>;

/**
 * Represents when a reaction-emoji was removed from a message.
 * Equals to MessageReactionAdd but with 'channelId', 'messageId', 'emoji' and 'guildId' properties guaranteed.
 * @see {@link MessageReactionRemove}
 * @see {@link Emoji}
 * @link https://discord.com/developers/docs/topics/gateway#message-reaction-remove-emoji
 */
export type MessageReactionRemoveEmoji = Pick<
    MessageReactionAdd,
    'channelId' | 'guildId' | 'messageId' | 'emoji'
>;

/**
 * Creates a new MessageReactionAdd object.
 * @param session - Current application session.
 * @param data - Discord message reaction to parse.
 */
export function NewMessageReactionAdd(session: Session, data: DiscordMessageReactionAdd): MessageReactionAdd {
    return {
        userId: data.user_id,
        channelId: data.channel_id,
        messageId: data.message_id,
        guildId: data.guild_id,
        member: data.member
            ? new Member(session, data.member as DiscordMemberWithUser, data.guild_id || '')
            : undefined,
        emoji: new Emoji(session, data.emoji),
    };
}

/**
 * Represents a reaction
 * @link https://discord.com/developers/docs/resources/channel#reaction-object
 */
export class MessageReaction {
    constructor(session: Session, data: DiscordReaction) {
        this.session = session;
        this.me = data.me;
        this.count = data.count;
        this.emoji = new Emoji(session, data.emoji);
    }

    readonly session: Session;
    me: boolean;
    count: number;
    emoji: Emoji;
}

export default MessageReaction;