import { Bot, ButtonStyles, Embed, Interaction, InteractionResponseTypes, MessageComponentTypes } from '../../../deps.ts';
import { LFGMember, UrlIds } from '../../types/commandTypes.ts';
import { sendDirectMessage, somethingWentWrong } from '../../commandUtils.ts';
import { generateAlternateList, generateMemberList, generateMemberTitle, leaveEventBtnStr, LfgEmbedIndexes, noMembersStr } from '../eventUtils.ts';
import utils from '../../utils.ts';

// Get Member Counts from the title
const getEventMemberCount = (rawMemberTitle: string): [number, number] => {
	const [rawCurrentCount, rawMaxCount] = rawMemberTitle.split('/');
	const currentMemberCount = parseInt(rawCurrentCount.split(':')[1] || '0');
	const maxMemberCount = parseInt(rawMaxCount || '0');
	return [currentMemberCount, maxMemberCount];
};

// Get LFGMember objects from string list
const getLfgMembers = (rawMemberList: string): Array<LFGMember> =>
	rawMemberList.trim() === noMembersStr ? [] : rawMemberList.split('\n').map((rawMember) => {
		const [memberName, memberMention] = rawMember.split('-');
		const lfgMember: LFGMember = {
			id: BigInt(memberMention.split('<@')[1].split('>')[0].trim() || '0'),
			name: memberName.trim(),
			joined: rawMember.endsWith('*'),
		};
		return lfgMember;
	});

// Remove LFGMember from array filter
const removeLfgMember = (memberList: Array<LFGMember>, memberId: bigint): Array<LFGMember> => memberList.filter((member) => member.id !== memberId);

const editEvent = async (
	bot: Bot,
	interaction: Interaction,
	evtMessageEmbed: Embed,
	evtMessageId: bigint,
	evtChannelId: bigint,
	memberList: Array<LFGMember>,
	maxMemberCount: number,
	alternateList: Array<LFGMember>,
) => {
	if (evtMessageEmbed.fields) {
		// Update the fields
		evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].name = generateMemberTitle(memberList, maxMemberCount);
		evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].value = generateMemberList(memberList);
		evtMessageEmbed.fields[LfgEmbedIndexes.AlternateMembers].value = generateAlternateList(alternateList);

		// Edit the event
		await bot.helpers.editMessage(evtChannelId, evtMessageId, {
			embeds: [evtMessageEmbed],
		}).then(() => {
			// Let discord know we didn't ignore the user
			bot.helpers.sendInteractionResponse(interaction.id, interaction.token, {
				type: InteractionResponseTypes.DeferredUpdateMessage,
			}).catch((e: Error) => utils.commonLoggers.interactionSendError('utils.ts', interaction, e));
		}).catch((e: Error) => {
			// Edit failed, try to notify user
			utils.commonLoggers.messageEditError('utils.ts', 'event edit fail', e);
			somethingWentWrong(bot, interaction, 'editFailedInUpdateEvent');
		});
	}
};

const noEdit = async (bot: Bot, interaction: Interaction) =>
	bot.helpers.sendInteractionResponse(interaction.id, interaction.token, {
		type: InteractionResponseTypes.DeferredUpdateMessage,
	}).catch((e: Error) => utils.commonLoggers.interactionSendError('utils.ts', interaction, e));

// Remove member from the event
export const removeMemberFromEvent = async (bot: Bot, interaction: Interaction, evtMessageEmbed: Embed, evtMessageId: bigint, evtChannelId: bigint, userId: bigint, evtGuildId: bigint) => {
	if (evtMessageEmbed.fields) {
		// Get old counts
		const [oldMemberCount, maxMemberCount] = getEventMemberCount(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].name);
		// Remove user from event
		const oldMemberList = getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].value);
		const memberList = removeLfgMember(oldMemberList, userId);
		const oldAlternateList = getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.AlternateMembers].value);
		let alternateList = removeLfgMember(oldAlternateList, userId);

		// Check if user actually left event
		if (oldMemberList.length !== memberList.length || oldAlternateList.length !== alternateList.length) {
			// Check if we need to auto-promote a member
			const memberToPromote = alternateList.find((member) => member.joined);
			if (oldMemberCount !== memberList.length && oldMemberCount === maxMemberCount && memberToPromote) {
				// Promote member
				alternateList = removeLfgMember(alternateList, memberToPromote.id);
				memberList.push(memberToPromote);

				const urlIds: UrlIds = {
					guildId: evtGuildId,
					channelId: evtChannelId,
					messageId: evtMessageId,
				};

				const guildDetails = await bot.helpers.getGuild(evtGuildId).catch((e: Error) => utils.commonLoggers.messageGetError('utils.ts', 'get guild', e));

				// Notify member of promotion
				await sendDirectMessage(bot, memberToPromote.id, {
					embeds: [{
						color: successColor,
						title: 'Good news, you\'ve been promoted!',
						description: `A member left [the full event](${utils.idsToMessageUrl(urlIds)}) in ${
							guildDetails?.name || '`failed to get guild name`'
						} you tried to join, leaving space for me to promote you from the alternate list to the joined list.\n\nPlease verify the event details below.  If you are no longer available for this event, please click on the '${leaveEventBtnStr}' button below`,
						fields: [
							evtMessageEmbed.fields[LfgEmbedIndexes.Activity],
							evtMessageEmbed.fields[LfgEmbedIndexes.StartTime],
							evtMessageEmbed.fields[LfgEmbedIndexes.ICSLink],
						],
					}],
					components: [{
						type: MessageComponentTypes.ActionRow,
						components: [{
							type: MessageComponentTypes.Button,
							label: leaveEventBtnStr,
							style: ButtonStyles.Danger,
							customId: 'leaveEventCustomId', // TODO: fix
						}],
					}],
				}).catch((e: Error) => utils.commonLoggers.messageSendError('utils.ts', 'user promotion', e));
			}

			// Update the event
			await editEvent(bot, interaction, evtMessageEmbed, evtMessageId, evtChannelId, memberList, maxMemberCount, alternateList);
		} else {
			// Send noEdit response because user did not actually leave
			await noEdit(bot, interaction);
		}
	} else {
		await somethingWentWrong(bot, interaction, 'noFieldsInRemoveMember');
	}
};

// Alternate member to the event
export const alternateMemberToEvent = async (bot: Bot, interaction: Interaction, evtMessageEmbed: Embed, evtMessageId: bigint, evtChannelId: bigint, member: LFGMember, userJoinOnFull = false) => {
	if (evtMessageEmbed.fields) {
		member.joined = userJoinOnFull;
		// Get current alternates
		let alternateList = getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.AlternateMembers].value);

		// Verify user is not already on the alternate list
		if (!alternateList.find((alternateMember) => alternateMember.id === member.id && alternateMember.joined === member.joined)) {
			// Add user to event, remove first to update joined status if necessary
			alternateList = removeLfgMember(alternateList, member.id);
			alternateList.push(member);

			// Get member count and remove user from joined list (if they are there)
			const [_oldMemberCount, maxMemberCount] = getEventMemberCount(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].name);
			const memberList = removeLfgMember(getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].value), member.id);

			// Update the event
			evtMessageEmbed.fields[LfgEmbedIndexes.AlternateMembers].value = generateAlternateList(alternateList);
			await editEvent(bot, interaction, evtMessageEmbed, evtMessageId, evtChannelId, memberList, maxMemberCount, alternateList);
		} else {
			// Send noEdit response because user was already an alternate and joined status did not change
			await noEdit(bot, interaction);
		}
	} else {
		// No fields, can't alternate
		await somethingWentWrong(bot, interaction, 'noFieldsInAlternateMember');
	}
};

// Join member to the event
export const joinMemberToEvent = async (bot: Bot, interaction: Interaction, evtMessageEmbed: Embed, evtMessageId: bigint, evtChannelId: bigint, member: LFGMember) => {
	if (evtMessageEmbed.fields) {
		// Get current member list and count
		const [oldMemberCount, maxMemberCount] = getEventMemberCount(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].name);
		const memberList = getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.JoinedMembers].value);
		// Verify user is not already on the joined list
		if (memberList.find((joinedMember) => joinedMember.id === member.id)) {
			// Send noEdit response because user was already joined
			await noEdit(bot, interaction);
		} else if (oldMemberCount === maxMemberCount) {
			// Event full, add member to alternate list
			await alternateMemberToEvent(bot, interaction, evtMessageEmbed, evtMessageId, evtChannelId, member, true);
		} else {
			// Join member to event
			memberList.push(member);

			// Remove user from alternate list (if they are there)
			const alternateList = removeLfgMember(getLfgMembers(evtMessageEmbed.fields[LfgEmbedIndexes.AlternateMembers].value), member.id);

			// Update the event
			await editEvent(bot, interaction, evtMessageEmbed, evtMessageId, evtChannelId, memberList, maxMemberCount, alternateList);
		}
	} else {
		// No fields, can't join
		await somethingWentWrong(bot, interaction, 'noFieldsInJoinMember');
	}
};