/*
 * Copyright (C) 2026 Fluxer Contributors
 *
 * This file is part of Fluxer.
 *
 * Fluxer 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.
 *
 * Fluxer 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 Fluxer. If not, see <https://www.gnu.org/licenses/>.
 */

import {msg} from '@lingui/core/macro';
import i18n from '~/i18n';
import type {UnicodeEmoji} from '~/lib/UnicodeEmojis';
import UnicodeEmojis from '~/lib/UnicodeEmojis';
import type {MessageRecord} from '~/records/MessageRecord';
import ChannelStore from '~/stores/ChannelStore';
import MessageReactionsStore from '~/stores/MessageReactionsStore';
import UserSettingsStore from '~/stores/UserSettingsStore';
import * as AvatarUtils from '~/utils/AvatarUtils';
import * as EmojiUtils from '~/utils/EmojiUtils';
import {shouldUseNativeEmoji} from '~/utils/EmojiUtils';
import * as NicknameUtils from '~/utils/NicknameUtils';

export type {UnicodeEmoji} from '~/lib/UnicodeEmojis';

export interface ReactionEmoji {
	id?: string;
	name: string;
	animated?: boolean;
}

export const getReactionTooltip = (message: MessageRecord, emoji: ReactionEmoji) => {
	const channel = ChannelStore.getChannel(message.channelId)!;
	const guildId = channel.guildId;
	const users = MessageReactionsStore.getReactions(message.id, emoji)
		.slice(0, 3)
		.map((user) => NicknameUtils.getNickname(user, guildId));

	if (users.length === 0) {
		return '';
	}

	const reaction = message.getReaction(emoji);
	const othersCount = Math.max(0, (reaction?.count || 0) - users.length);
	const emojiName = getEmojiNameWithColons(emoji);

	if (users.length === 1) {
		if (othersCount > 0) {
			return othersCount === 1
				? i18n._(msg`${emojiName} reacted by ${users[0]} and ${othersCount} other`)
				: i18n._(msg`${emojiName} reacted by ${users[0]} and ${othersCount} others`);
		}
		return i18n._(msg`${emojiName} reacted by ${users[0]}`);
	}

	if (users.length === 2) {
		if (othersCount > 0) {
			return othersCount === 1
				? i18n._(msg`${emojiName} reacted by ${users[0]}, ${users[1]} and ${othersCount} other`)
				: i18n._(msg`${emojiName} reacted by ${users[0]}, ${users[1]} and ${othersCount} others`);
		}
		return i18n._(msg`${emojiName} reacted by ${users[0]} and ${users[1]}`);
	}

	if (users.length === 3) {
		if (othersCount > 0) {
			return othersCount === 1
				? i18n._(msg`${emojiName} reacted by ${users[0]}, ${users[1]}, ${users[2]} and ${othersCount} other`)
				: i18n._(msg`${emojiName} reacted by ${users[0]}, ${users[1]}, ${users[2]} and ${othersCount} others`);
		}
		return i18n._(msg`${emojiName} reacted by ${users[0]}, ${users[1]} and ${users[2]}`);
	}

	return othersCount === 1
		? i18n._(msg`${emojiName} reacted by ${othersCount} other`)
		: i18n._(msg`${emojiName} reacted by ${othersCount} others`);
};

const isCustomEmoji = (emoji: UnicodeEmoji | ReactionEmoji): emoji is ReactionEmoji =>
	'id' in emoji && emoji.id != null;

export const toReactionEmoji = (emoji: UnicodeEmoji | ReactionEmoji) =>
	isCustomEmoji(emoji) ? emoji : {name: emoji.surrogates};

export const emojiEquals = (reactionEmoji: ReactionEmoji, emoji: UnicodeEmoji | ReactionEmoji) =>
	isCustomEmoji(emoji) ? emoji.id === reactionEmoji.id : reactionEmoji.id == null && emoji.name === reactionEmoji.name;

export const getReactionKey = (messageId: string, emoji: ReactionEmoji) =>
	`${messageId}:${emoji.name}:${emoji.id || ''}`;

export const getEmojiName = (emoji: ReactionEmoji): string =>
	emoji.id == null ? UnicodeEmojis.getSurrogateName(emoji.name) || emoji.name : `:${emoji.name}:`;

export const getEmojiNameWithColons = (emoji: ReactionEmoji): string => {
	const name = emoji.id == null ? UnicodeEmojis.getSurrogateName(emoji.name) || emoji.name : emoji.name;
	return `:${name}:`;
};

export const useEmojiURL = ({
	emoji,
	isHovering = false,
	size = 128,
	forceAnimate = false,
}: {
	emoji: ReactionEmoji;
	isHovering?: boolean;
	size?: number;
	forceAnimate?: boolean;
}): string | null => {
	const {animateEmoji} = UserSettingsStore;

	let shouldAnimate = false;
	if (forceAnimate) {
		shouldAnimate = emoji.animated ?? false;
	} else if (animateEmoji) {
		shouldAnimate = emoji.animated ?? false;
	} else if (emoji.animated) {
		shouldAnimate = isHovering;
	}

	if (emoji.id == null) {
		if (shouldUseNativeEmoji) {
			return null;
		}
		return EmojiUtils.getEmojiURL(emoji.name);
	}

	const url = AvatarUtils.getEmojiURL({id: emoji.id, animated: shouldAnimate});
	return `${url}?size=${size}&quality=lossless`;
};