import { getVoiceConnection, type VoiceConnection } from "@discordjs/voice";
import type { Client, Guild, VoiceChannel } from "discord.js-selfbot-v13";
import { AppError } from "./errors";
import { createChildLogger } from "./logger";
import { discordPlayer } from "./player";
import { startRecording, stopRecording } from "./recorder";

const logger = createChildLogger("voice-controller");

export interface VoiceStatus {
  ready: boolean;
  connected: boolean;
  activeGuildId: string | null;
  activeChannelId: string | null;
  activeChannelName: string | null;
}

export interface GuildSummary {
  id: string;
  name: string;
}

export interface VoiceChannelSummary {
  id: string;
  name: string;
}

export interface ChannelSummary {
  id: string;
  name: string;
  type: string;
}

export class VoiceController {
  private activeGuildId: string | null = null;
  private activeChannelId: string | null = null;
  private activeChannelName: string | null = null;
  private connecting = false;

  constructor(private readonly client: Client) {}

  getStatus(): VoiceStatus {
    const connection = this.activeGuildId
      ? getVoiceConnection(this.activeGuildId)
      : undefined;

    return {
      ready: this.client.isReady(),
      connected: Boolean(connection),
      activeGuildId: this.activeGuildId,
      activeChannelId: this.activeChannelId,
      activeChannelName: this.activeChannelName,
    };
  }

  listGuilds(): GuildSummary[] {
    return this.client.guilds.cache
      .map((guild) => ({ id: guild.id, name: guild.name }))
      .sort((a, b) => a.name.localeCompare(b.name));
  }

  async listVoiceChannels(guildId: string): Promise<VoiceChannelSummary[]> {
    const guild = this.getGuild(guildId);
    await guild.channels.fetch().catch(() => null);

    return guild.channels.cache
      .filter((channel) => channel.type === "GUILD_VOICE")
      .map((channel) => ({ id: channel.id, name: channel.name }))
      .sort((a, b) => a.name.localeCompare(b.name));
  }

  async listWatchableChannels(guildId: string): Promise<ChannelSummary[]> {
    const guild = this.getGuild(guildId);
    await guild.channels.fetch().catch(() => null);

    return guild.channels.cache
      .filter((channel) => channel.type === "GUILD_TEXT")
      .map((channel) => ({
        id: channel.id,
        name: channel.name,
        type: channel.type,
      }))
      .sort((a, b) => a.name.localeCompare(b.name));
  }

  async listThreads(guildId: string): Promise<ChannelSummary[]> {
    const guild = this.getGuild(guildId);
    await guild.channels.fetch().catch(() => null);

    const threads: ChannelSummary[] = [];
    for (const channel of guild.channels.cache.values()) {
      const threadParent = channel as typeof channel & {
        threads?: {
          fetch: (options: {
            archived: boolean;
            limit: number;
          }) => Promise<any>;
        };
      };
      if (!threadParent.threads?.fetch) continue;

      for (const archived of [false, true]) {
        const fetched = await threadParent.threads
          .fetch({ archived, limit: 100 })
          .catch(() => null);
        if (!fetched?.threads) continue;

        for (const thread of fetched.threads.values()) {
          threads.push({
            id: thread.id,
            name: `${channel.name} / ${thread.name}`,
            type: thread.type,
          });
        }
      }
    }

    return Array.from(
      new Map(threads.map((thread) => [thread.id, thread])).values(),
    ).sort((a, b) => a.name.localeCompare(b.name));
  }

  async connect(guildId: string, channelId: string): Promise<VoiceStatus> {
    if (!this.client.isReady()) {
      throw new AppError(
        "Discord client is not ready",
        "CLIENT_NOT_READY",
        409,
      );
    }

    if (this.connecting) {
      throw new AppError(
        "Voice connection is already in progress",
        "CONNECT_IN_PROGRESS",
        409,
      );
    }

    this.connecting = true;

    try {
      await this.disconnect();

      const guild = this.getGuild(guildId);
      const channel =
        guild.channels.cache.get(channelId) ??
        (await guild.channels.fetch(channelId).catch(() => null));

      if (!channel) {
        throw new AppError(
          "Voice channel not found",
          "VOICE_CHANNEL_NOT_FOUND",
          404,
        );
      }

      if (channel.type !== "GUILD_VOICE") {
        throw new AppError(
          "Selected channel is not a voice channel",
          "INVALID_CHANNEL_TYPE",
          400,
        );
      }

      const connection = await startRecording(
        this.client,
        channel as VoiceChannel,
      );
      if (!connection) {
        throw new AppError(
          "Failed to connect to voice channel",
          "VOICE_CONNECT_FAILED",
          500,
        );
      }

      discordPlayer.setConnection(connection as VoiceConnection);
      this.activeGuildId = guildId;
      this.activeChannelId = channelId;
      this.activeChannelName = channel.name;

      logger.info(
        { guildId, channelId, channelName: channel.name },
        "Voice connected",
      );

      return this.getStatus();
    } finally {
      this.connecting = false;
    }
  }

  async disconnect(): Promise<VoiceStatus> {
    if (this.activeGuildId) {
      stopRecording(this.activeGuildId);
    }

    discordPlayer.pause();
    this.activeGuildId = null;
    this.activeChannelId = null;
    this.activeChannelName = null;

    return this.getStatus();
  }

  private getGuild(guildId: string): Guild {
    const guild = this.client.guilds.cache.get(guildId);

    if (!guild) {
      throw new AppError("Guild not found", "GUILD_NOT_FOUND", 404);
    }

    return guild;
  }
}