import { DeleteButton, type CommandMessage, type SlashMessage } from '#lib';
import { CommandUtil } from 'discord-akairo';
import {
	ActionRowBuilder,
	ButtonBuilder,
	ButtonStyle,
	EmbedBuilder,
	type APIEmbed,
	type Message,
	type MessageComponentInteraction
} from 'discord.js';

/**
 * Sends multiple embeds with controls to switch between them
 */
export class ButtonPaginator {
	/**
	 * The current page of the paginator
	 */
	protected curPage: number;

	/**
	 * The paginator message
	 */
	protected sentMessage: Message | undefined;

	/**
	 * @param message The message to respond to
	 * @param embeds The embeds to switch between
	 * @param text The text send with the embeds (optional)
	 * @param deleteOnExit Whether to delete the message when the exit button is clicked (defaults to true)
	 * @param startOn The page to start from (**not** the index)
	 */
	protected constructor(
		/**
		 * The message that triggered the command
		 */
		protected message: CommandMessage | SlashMessage,

		/**
		 * The embeds to paginate
		 */
		protected embeds: EmbedBuilder[] | APIEmbed[],

		/**
		 * The optional text to send with the paginator
		 */
		protected text: string | null,

		/**
		 * Whether the paginator message gets deleted when the exit button is pressed
		 */
		protected deleteOnExit: boolean,
		startOn: number
	) {
		this.curPage = startOn - 1;

		// add footers
		for (let i = 0; i < embeds.length; i++) {
			if (embeds[i] instanceof EmbedBuilder) {
				(embeds[i] as EmbedBuilder).setFooter({ text: `Page ${(i + 1).toLocaleString()}/${embeds.length.toLocaleString()}` });
			} else {
				(embeds[i] as APIEmbed).footer = {
					text: `Page ${(i + 1).toLocaleString()}/${embeds.length.toLocaleString()}`
				};
			}
		}
	}

	/**
	 * The number of pages in the paginator
	 */
	protected get numPages(): number {
		return this.embeds.length;
	}

	/**
	 * Sends the paginator message
	 */
	protected async send() {
		this.sentMessage = await this.message.util.reply({
			content: this.text,
			embeds: [this.embeds[this.curPage]],
			components: [this.getPaginationRow()]
		});

		const collector = this.sentMessage.createMessageComponentCollector({
			filter: (i) => i.customId.startsWith('paginate_'),
			time: 300_000
		});
		collector.on('collect', (i) => void this.collect(i));
		collector.on('end', () => void this.end());
	}

	/**
	 * Handles interactions with the paginator
	 * @param interaction The interaction received
	 */
	protected async collect(interaction: MessageComponentInteraction) {
		if (interaction.user.id !== this.message.author.id && !this.message.client.config.owners.includes(interaction.user.id))
			return await interaction?.deferUpdate().catch(() => null);

		switch (interaction.customId) {
			case 'paginate_beginning':
				this.curPage = 0;
				await this.edit(interaction);
				break;
			case 'paginate_back':
				this.curPage--;
				await this.edit(interaction);
				break;
			case 'paginate_stop':
				if (this.deleteOnExit) {
					await interaction.deferUpdate().catch(() => null);
					await this.sentMessage!.delete().catch(() => null);
					break;
				} else {
					await interaction
						?.update({
							content: `${this.text ? `${this.text}\n` : ''}Command closed by user.`,
							embeds: [],
							components: []
						})
						.catch(() => null);
					break;
				}
			case 'paginate_next':
				this.curPage++;
				await this.edit(interaction);
				break;
			case 'paginate_end':
				this.curPage = this.embeds.length - 1;
				await this.edit(interaction);
				break;
		}
	}

	/**
	 * Ends the paginator
	 */
	protected async end() {
		if (this.sentMessage && !CommandUtil.deletedMessages.has(this.sentMessage.id))
			await this.sentMessage
				.edit({
					content: this.text,
					embeds: [this.embeds[this.curPage]],
					components: [this.getPaginationRow(true)]
				})
				.catch(() => null);
	}

	/**
	 * Edits the paginator message
	 * @param interaction The interaction received
	 */
	protected async edit(interaction: MessageComponentInteraction) {
		await interaction
			?.update({
				content: this.text,
				embeds: [this.embeds[this.curPage]],
				components: [this.getPaginationRow()]
			})
			.catch(() => null);
	}

	/**
	 * Generates the pagination row based on the class properties
	 * @param disableAll Whether to disable all buttons
	 * @returns The generated {@link ActionRow}
	 */
	protected getPaginationRow(disableAll = false) {
		return new ActionRowBuilder<ButtonBuilder>().addComponents([
			new ButtonBuilder({
				style: ButtonStyle.Primary,
				customId: 'paginate_beginning',
				emoji: PaginateEmojis.BEGINNING,
				disabled: disableAll || this.curPage === 0
			}),
			new ButtonBuilder({
				style: ButtonStyle.Primary,
				customId: 'paginate_back',
				emoji: PaginateEmojis.BACK,
				disabled: disableAll || this.curPage === 0
			}),
			new ButtonBuilder({
				style: ButtonStyle.Primary,
				customId: 'paginate_stop',
				emoji: PaginateEmojis.STOP,
				disabled: disableAll
			}),
			new ButtonBuilder({
				style: ButtonStyle.Primary,
				customId: 'paginate_next',
				emoji: PaginateEmojis.FORWARD,
				disabled: disableAll || this.curPage === this.numPages - 1
			}),
			new ButtonBuilder({
				style: ButtonStyle.Primary,
				customId: 'paginate_end',
				emoji: PaginateEmojis.END,
				disabled: disableAll || this.curPage === this.numPages - 1
			})
		]);
	}

	/**
	 * Sends multiple embeds with controls to switch between them
	 * @param message The message to respond to
	 * @param embeds The embeds to switch between
	 * @param text The text send with the embeds (optional)
	 * @param deleteOnExit Whether to delete the message when the exit button is clicked (defaults to true)
	 * @param startOn The page to start from (**not** the index)
	 */
	public static async send(
		message: CommandMessage | SlashMessage,
		embeds: EmbedBuilder[] | APIEmbed[],
		text: string | null = null,
		deleteOnExit = true,
		startOn = 1
	) {
		// no need to paginate if there is only one page
		if (embeds.length === 1) return DeleteButton.send(message, { embeds: embeds });

		return await new ButtonPaginator(message, embeds, text, deleteOnExit, startOn).send();
	}
}

export const PaginateEmojis = {
	BEGINNING: { id: '853667381335162910', name: 'w_paginate_beginning', animated: false } as const,
	BACK: { id: '853667410203770881', name: 'w_paginate_back', animated: false } as const,
	STOP: { id: '853667471110570034', name: 'w_paginate_stop', animated: false } as const,
	FORWARD: { id: '853667492680564747', name: 'w_paginate_next', animated: false } as const,
	END: { id: '853667514915225640', name: 'w_paginate_end', animated: false } as const
} as const;