import {
  getChannelPlugin,
  normalizeChannelId as normalizeAnyChannelId,
} from "../../channels/plugins/index.js";
import { normalizeChannelId as normalizeChatChannelId } from "../../channels/registry.js";
import type { ClawdbotConfig } from "../../config/config.js";

const ANNOUNCE_SKIP_TOKEN = "ANNOUNCE_SKIP";
const REPLY_SKIP_TOKEN = "REPLY_SKIP";
const DEFAULT_PING_PONG_TURNS = 5;
const MAX_PING_PONG_TURNS = 5;

export type AnnounceTarget = {
  channel: string;
  to: string;
  accountId?: string;
  threadId?: string; // Forum topic/thread ID
};

export function resolveAnnounceTargetFromKey(sessionKey: string): AnnounceTarget | null {
  const rawParts = sessionKey.split(":").filter(Boolean);
  const parts = rawParts.length >= 3 && rawParts[0] === "agent" ? rawParts.slice(2) : rawParts;
  if (parts.length < 3) return null;
  const [channelRaw, kind, ...rest] = parts;
  if (kind !== "group" && kind !== "channel") return null;

  // Extract topic/thread ID from rest (supports both :topic: and :thread:)
  // Telegram uses :topic:, other platforms use :thread:
  let threadId: string | undefined;
  const restJoined = rest.join(":");
  const topicMatch = restJoined.match(/:topic:(\d+)$/);
  const threadMatch = restJoined.match(/:thread:(\d+)$/);
  const match = topicMatch || threadMatch;

  if (match) {
    threadId = match[1]; // Keep as string to match AgentCommandOpts.threadId
  }

  // Remove :topic:N or :thread:N suffix from ID for target
  const id = match ? restJoined.replace(/:(topic|thread):\d+$/, "") : restJoined.trim();

  if (!id) return null;
  if (!channelRaw) return null;
  const normalizedChannel = normalizeAnyChannelId(channelRaw) ?? normalizeChatChannelId(channelRaw);
  const channel = normalizedChannel ?? channelRaw.toLowerCase();
  const kindTarget = (() => {
    if (!normalizedChannel) return id;
    if (normalizedChannel === "discord" || normalizedChannel === "slack") {
      return `channel:${id}`;
    }
    return kind === "channel" ? `channel:${id}` : `group:${id}`;
  })();
  const normalized = normalizedChannel
    ? getChannelPlugin(normalizedChannel)?.messaging?.normalizeTarget?.(kindTarget)
    : undefined;
  return {
    channel,
    to: normalized ?? kindTarget,
    threadId,
  };
}

export function buildAgentToAgentMessageContext(params: {
  requesterSessionKey?: string;
  requesterChannel?: string;
  targetSessionKey: string;
}) {
  const lines = [
    "Agent-to-agent message context:",
    params.requesterSessionKey
      ? `Agent 1 (requester) session: ${params.requesterSessionKey}.`
      : undefined,
    params.requesterChannel
      ? `Agent 1 (requester) channel: ${params.requesterChannel}.`
      : undefined,
    `Agent 2 (target) session: ${params.targetSessionKey}.`,
  ].filter(Boolean);
  return lines.join("\n");
}

export function buildAgentToAgentReplyContext(params: {
  requesterSessionKey?: string;
  requesterChannel?: string;
  targetSessionKey: string;
  targetChannel?: string;
  currentRole: "requester" | "target";
  turn: number;
  maxTurns: number;
}) {
  const currentLabel =
    params.currentRole === "requester" ? "Agent 1 (requester)" : "Agent 2 (target)";
  const lines = [
    "Agent-to-agent reply step:",
    `Current agent: ${currentLabel}.`,
    `Turn ${params.turn} of ${params.maxTurns}.`,
    params.requesterSessionKey
      ? `Agent 1 (requester) session: ${params.requesterSessionKey}.`
      : undefined,
    params.requesterChannel
      ? `Agent 1 (requester) channel: ${params.requesterChannel}.`
      : undefined,
    `Agent 2 (target) session: ${params.targetSessionKey}.`,
    params.targetChannel ? `Agent 2 (target) channel: ${params.targetChannel}.` : undefined,
    `If you want to stop the ping-pong, reply exactly "${REPLY_SKIP_TOKEN}".`,
  ].filter(Boolean);
  return lines.join("\n");
}

export function buildAgentToAgentAnnounceContext(params: {
  requesterSessionKey?: string;
  requesterChannel?: string;
  targetSessionKey: string;
  targetChannel?: string;
  originalMessage: string;
  roundOneReply?: string;
  latestReply?: string;
}) {
  const lines = [
    "Agent-to-agent announce step:",
    params.requesterSessionKey
      ? `Agent 1 (requester) session: ${params.requesterSessionKey}.`
      : undefined,
    params.requesterChannel
      ? `Agent 1 (requester) channel: ${params.requesterChannel}.`
      : undefined,
    `Agent 2 (target) session: ${params.targetSessionKey}.`,
    params.targetChannel ? `Agent 2 (target) channel: ${params.targetChannel}.` : undefined,
    `Original request: ${params.originalMessage}`,
    params.roundOneReply
      ? `Round 1 reply: ${params.roundOneReply}`
      : "Round 1 reply: (not available).",
    params.latestReply ? `Latest reply: ${params.latestReply}` : "Latest reply: (not available).",
    `If you want to remain silent, reply exactly "${ANNOUNCE_SKIP_TOKEN}".`,
    "Any other reply will be posted to the target channel.",
    "After this reply, the agent-to-agent conversation is over.",
  ].filter(Boolean);
  return lines.join("\n");
}

export function isAnnounceSkip(text?: string) {
  return (text ?? "").trim() === ANNOUNCE_SKIP_TOKEN;
}

export function isReplySkip(text?: string) {
  return (text ?? "").trim() === REPLY_SKIP_TOKEN;
}

export function resolvePingPongTurns(cfg?: ClawdbotConfig) {
  const raw = cfg?.session?.agentToAgent?.maxPingPongTurns;
  const fallback = DEFAULT_PING_PONG_TURNS;
  if (typeof raw !== "number" || !Number.isFinite(raw)) return fallback;
  const rounded = Math.floor(raw);
  return Math.max(0, Math.min(MAX_PING_PONG_TURNS, rounded));
}