import { Guild, MessageReaction, Role, User } from "discord.js";
import { GuildMember } from "discord.js";
import { logger } from "../logger";
import { config } from "../configuration";
import { Maybe } from "../interfaces";

export default class RoleController {

	constructor() { }
	private getAnnounceRoleIdForGuild(guildId: string): string {
		const role = config.bot.announcement_role
		if (!role) throw new Error(`No announcementRole defined for guild ${guildId}`)
		return role
	}
	public async addRoleToUser(member: GuildMember, role: Role, guildId: string, requestId: string) {
		logger.info(`Adding Role ${role.id} to user ${member.id}|${member.user.username}`, { requestId, guildId })
		return await member.roles.add(role)
	}
	private async removeRoleFromUser(member: GuildMember, role: Role, guildId: string, requestId: string) {
		logger.info(`Removing Role ${role.id} from user ${member.id}|${member.user.username}`, { requestId, guildId })
		return await member.roles.remove(role)
	}

	public async addMediaRoleToUser(user: User, guild: Guild, requestId: string) {
		const roleToAdd = await this.getAnnouncementRoleForGuild(guild, requestId)
		if (!roleToAdd) throw new Error(`No announcementRole found to add to user`)
		const guildMember = await guild.members.fetch(user)
		return this.addRoleToUser(guildMember, roleToAdd, guild.id, requestId)
	}
	public async removeMediaRoleFromUser(user: User, guild: Guild, requestId: string) {
		const roleToRemove = await this.getAnnouncementRoleForGuild(guild, requestId)
		if (!roleToRemove) throw new Error(`No announcementRole found to remove from user`)
		const guildMember = await guild.members.fetch(user)
		return this.removeRoleFromUser(guildMember, roleToRemove, guild.id, requestId)
	}

	public async getAnnouncementRoleForGuild(guild: Guild, requestId: string): Promise<Maybe<Role>> {
		const mediaRole = this.getAnnounceRoleIdForGuild(guild.id)
		return guild.roles.fetch()
			.then(fetchedRoles => fetchedRoles.find(role => role.id === mediaRole))
			.catch(error => { logger.error(`Could not find announcement_role with id ${config.bot.announcement_role}. Error: ${error}`, { requestId, guildId: guild.id }) })
	}

	public async assignAnnouncementRolesFromReactions(guild: Guild, reaction: MessageReaction, requestId: string) {
		const guildId = guild.id
		logger.info("Managing roles", { guildId, requestId })

		const announcementRole = await this.getAnnouncementRoleForGuild(guild, requestId)
		if (!announcementRole)
			throw new Error(`No announcementRole found in guild ${guildId}`)

		const usersWhoWantRole: User[] = (await reaction.users.fetch()).filter(user => !user.bot).map(user => user)

		const allUsers = await guild.members.fetch()

		const usersWhoHaveRole: GuildMember[] = allUsers
			.filter(member => member.roles.cache
				.find(role => role.id === announcementRole.id) !== undefined)
			.map(member => member)

		const usersWhoNeedRoleRevoked: GuildMember[] = usersWhoHaveRole
			.filter(userWhoHas => !usersWhoWantRole.map(wanter => wanter.id).includes(userWhoHas.id))

		const usersWhoDontHaveRole: GuildMember[] = allUsers
			.filter(member => member.roles.cache
				.find(role => role.id === announcementRole.id) === undefined)
			.map(member => member)

		const usersWhoNeedRole: GuildMember[] = usersWhoDontHaveRole
			.filter(userWhoNeeds => usersWhoWantRole.map(wanter => wanter.id).includes(userWhoNeeds.id))


		logger.debug(`Theses users will get the role removed: ${JSON.stringify(usersWhoNeedRoleRevoked)}`, { guildId, requestId })
		logger.debug(`Theses users will get the role added: ${JSON.stringify(usersWhoNeedRole)}`, { guildId, requestId })

		usersWhoNeedRoleRevoked.forEach(user => this.removeRoleFromUser(user, announcementRole, guild.id, requestId))
		usersWhoNeedRole.forEach(user => this.addRoleToUser(user, announcementRole, guild.id, requestId))
	}

}