import { GuildMember, User } from "discord.js";
import { UserDto } from "./model/userDto";
import { Config } from "../server/configuration";
import { UserApi } from "./api/userApi";
import { logger } from "../server/logger";
import { SystemApi } from "./api/systemApi";
import { CreateUserByNameRequest, UpdateUserPolicyRequest, UpdateUserRequest } from "./api";
import { Maybe } from "../server/interfaces";

export class JellyfinHandler {

  private userApi: UserApi
  private systemApi: SystemApi
  private token: string
  private authHeader: { headers: { 'X-MediaBrowser-Token': string } }
  private config: Config
  private serverName = "";

  public async ServerName(): Promise<string> {
    if (this.serverName === "") {
      const info = await this.systemApi.getSystemInfo(this.authHeader)
      this.serverName = info.body.serverName ?? this.config.bot.jellyfin_url
    }
    return this.serverName
  }
  constructor(_config: Config, _userApi?: UserApi, _systemApi?: SystemApi) {
    this.config = _config
    this.userApi = _userApi ?? new UserApi(this.config.bot.jellyfin_url)
    this.systemApi = _systemApi ?? new SystemApi(this.config.bot.jellyfin_url)
    this.token = this.config.bot.jellfin_token
    this.authHeader = {
      headers: {
        "X-MediaBrowser-Token": this.token
      }
    }
  }

  private generateJFUserName(discordUser: GuildMember): string {
    return discordUser.displayName
  }

  public async addPermissionsToUserAccount(jfUserAccount: UserDto, guildId: string, requestId: string): Promise<UserDto> {
    throw new Error("Method not implemented.");
  }

  private generatePasswordForUser(user: GuildMember): string {
    return user.nickname + user.user.discriminator
  }

  public async createUserAccountForDiscordUser(discordUser: GuildMember, guildId?: string, requestId?: string): Promise<UserDto> {
    const newUserName = this.generateJFUserName(discordUser)
    logger.info(`New Username for ${discordUser.displayName}: ${newUserName}`, { guildId, requestId })
    const req: CreateUserByNameRequest = {
      name: newUserName,
      password: this.generatePasswordForUser(discordUser)
    }
    logger.debug(JSON.stringify(req))
    const createResult = await this.userApi.createUserByName(req, this.authHeader)
    if (createResult.body)
      return createResult.body
    else throw new Error('Could not create User in Jellyfin')
  }

  public async disableJfUser(user: UserDto, guildId?: string, requestId?: string): Promise<void> {
    if (user.id) {
      logger.info(`Trying to disable user: ${user.name}|${user.id}`)
      const r: UpdateUserPolicyRequest = {
        ...user.policy,
        isDisabled: true
      }
      await this.userApi.updateUserPolicy(user.id, r, this.authHeader)
      logger.info(`Succeeded with disabling user: ${user.name}`)
    }
    else {
      logger.error(`Can not disable user ${JSON.stringify(user)}, has no id?!`, { requestId, guildId })
    }
  }

  public async isUserAlreadyPresent(discordUser: GuildMember, requestId?: string): Promise<boolean> {
    const jfuser = await this.getUser(discordUser, requestId)
    logger.debug(`Presence for DiscordUser ${discordUser.id}:${jfuser !== undefined}`)
    return jfuser !== undefined
  }

  public async getCurrentUsers(guildId: string, requestId?: string): Promise<UserDto[]> {
    try {
      const result = await this.userApi.getUsers(undefined, undefined, this.authHeader)
      return result.body
    } catch (error) {
      logger.error(`Could not fetch current users from jellyfin`, { guildId, requestId })
    }
    return []
  }

  public async getUser(discordUser: GuildMember, requestId?: string): Promise<Maybe<UserDto>> {
    const jfUsernameFromDiscordUsername = this.generateJFUserName(discordUser)
    const jfUsers = await this.getCurrentUsers(discordUser.guild.id, requestId)
    const foundUser = jfUsers.find(x => x.name === jfUsernameFromDiscordUsername)
    return foundUser
  }

  public async removeUser(newMember: GuildMember, requestId?: string) {
    logger.error(`Trying to remove user ${newMember.displayName}, but method is not implemented`)
    const jfuser = await this.getUser(newMember, requestId)
    if (jfuser) {
      await this.disableJfUser(jfuser, newMember.guild.id, requestId)
    }
  }

  public async enableUser(user: UserDto, guildId?: string, requestId?: string): Promise<void> {
    if (user.id) {
      logger.info(`Trying to enable user: ${user.name}|${user.id}`)
      const r: UpdateUserPolicyRequest = {
        ...user.policy,
        isDisabled: false
      }
      await this.userApi.updateUserPolicy(user.id, r, this.authHeader)
      logger.info(`Succeeded with enabling user: ${user.name}`)
    }
    else {
      logger.error(`Can not enable user ${JSON.stringify(user)}, has no id?!`, { requestId, guildId })
    }
  }

  public async upsertUser(newMember: GuildMember, level: string, requestId?: string) {
    logger.error(`Trying to upsert user ${newMember.displayName}, with permissionLevel ${level}`)
    const jfuser = await this.getUser(newMember, requestId)
    if (jfuser) {
      logger.info(`User with name ${newMember.displayName} is already present`)
      await this.enableUser(jfuser, requestId)
    } else {
      this.createUserAccountForDiscordUser(newMember, newMember.guild.id, requestId)
    }



  }
}