import { resolveTextChunkLimit } from "../../auto-reply/chunk.js";
import type { ReplyPayload } from "../../auto-reply/types.js";
import { resolveChannelMediaMaxBytes } from "../../channels/plugins/media-limits.js";
import { loadChannelOutboundAdapter } from "../../channels/plugins/outbound/load.js";
import type { ChannelOutboundAdapter } from "../../channels/plugins/types.js";
import type { ClawdbotConfig } from "../../config/config.js";
import type { sendMessageDiscord } from "../../discord/send.js";
import type { sendMessageIMessage } from "../../imessage/send.js";
import { markdownToSignalTextChunks, type SignalTextStyleRange } from "../../signal/format.js";
import { sendMessageSignal } from "../../signal/send.js";
import type { sendMessageSlack } from "../../slack/send.js";
import type { sendMessageTelegram } from "../../telegram/send.js";
import type { sendMessageWhatsApp } from "../../web/outbound.js";
import {
  appendAssistantMessageToSessionTranscript,
  resolveMirroredTranscriptText,
} from "../../config/sessions.js";
import type { NormalizedOutboundPayload } from "./payloads.js";
import { normalizeOutboundPayloads } from "./payloads.js";
import type { OutboundChannel } from "./targets.js";

export type { NormalizedOutboundPayload } from "./payloads.js";
export { normalizeOutboundPayloads } from "./payloads.js";

type SendMatrixMessage = (
  to: string,
  text: string,
  opts?: { mediaUrl?: string; replyToId?: string; threadId?: string; timeoutMs?: number },
) => Promise<{ messageId: string; roomId: string }>;

export type OutboundSendDeps = {
  sendWhatsApp?: typeof sendMessageWhatsApp;
  sendTelegram?: typeof sendMessageTelegram;
  sendDiscord?: typeof sendMessageDiscord;
  sendSlack?: typeof sendMessageSlack;
  sendSignal?: typeof sendMessageSignal;
  sendIMessage?: typeof sendMessageIMessage;
  sendMatrix?: SendMatrixMessage;
  sendMSTeams?: (
    to: string,
    text: string,
    opts?: { mediaUrl?: string },
  ) => Promise<{ messageId: string; conversationId: string }>;
};

export type OutboundDeliveryResult = {
  channel: Exclude<OutboundChannel, "none">;
  messageId: string;
  chatId?: string;
  channelId?: string;
  roomId?: string;
  conversationId?: string;
  timestamp?: number;
  toJid?: string;
  pollId?: string;
  // Channel docking: stash channel-specific fields here to avoid core type churn.
  meta?: Record<string, unknown>;
};

type Chunker = (text: string, limit: number) => string[];

type ChannelHandler = {
  chunker: Chunker | null;
  textChunkLimit?: number;
  sendText: (text: string) => Promise<OutboundDeliveryResult>;
  sendMedia: (caption: string, mediaUrl: string) => Promise<OutboundDeliveryResult>;
};

function throwIfAborted(abortSignal?: AbortSignal): void {
  if (abortSignal?.aborted) {
    throw new Error("Outbound delivery aborted");
  }
}

// Channel docking: outbound delivery delegates to plugin.outbound adapters.
async function createChannelHandler(params: {
  cfg: ClawdbotConfig;
  channel: Exclude<OutboundChannel, "none">;
  to: string;
  accountId?: string;
  replyToId?: string | null;
  threadId?: string | number | null;
  deps?: OutboundSendDeps;
  gifPlayback?: boolean;
}): Promise<ChannelHandler> {
  const outbound = await loadChannelOutboundAdapter(params.channel);
  if (!outbound?.sendText || !outbound?.sendMedia) {
    throw new Error(`Outbound not configured for channel: ${params.channel}`);
  }
  const handler = createPluginHandler({
    outbound,
    cfg: params.cfg,
    channel: params.channel,
    to: params.to,
    accountId: params.accountId,
    replyToId: params.replyToId,
    threadId: params.threadId,
    deps: params.deps,
    gifPlayback: params.gifPlayback,
  });
  if (!handler) {
    throw new Error(`Outbound not configured for channel: ${params.channel}`);
  }
  return handler;
}

function createPluginHandler(params: {
  outbound?: ChannelOutboundAdapter;
  cfg: ClawdbotConfig;
  channel: Exclude<OutboundChannel, "none">;
  to: string;
  accountId?: string;
  replyToId?: string | null;
  threadId?: string | number | null;
  deps?: OutboundSendDeps;
  gifPlayback?: boolean;
}): ChannelHandler | null {
  const outbound = params.outbound;
  if (!outbound?.sendText || !outbound?.sendMedia) return null;
  const sendText = outbound.sendText;
  const sendMedia = outbound.sendMedia;
  const chunker = outbound.chunker ?? null;
  return {
    chunker,
    textChunkLimit: outbound.textChunkLimit,
    sendText: async (text) =>
      sendText({
        cfg: params.cfg,
        to: params.to,
        text,
        accountId: params.accountId,
        replyToId: params.replyToId,
        threadId: params.threadId,
        gifPlayback: params.gifPlayback,
        deps: params.deps,
      }),
    sendMedia: async (caption, mediaUrl) =>
      sendMedia({
        cfg: params.cfg,
        to: params.to,
        text: caption,
        mediaUrl,
        accountId: params.accountId,
        replyToId: params.replyToId,
        threadId: params.threadId,
        gifPlayback: params.gifPlayback,
        deps: params.deps,
      }),
  };
}

export async function deliverOutboundPayloads(params: {
  cfg: ClawdbotConfig;
  channel: Exclude<OutboundChannel, "none">;
  to: string;
  accountId?: string;
  payloads: ReplyPayload[];
  replyToId?: string | null;
  threadId?: string | number | null;
  deps?: OutboundSendDeps;
  gifPlayback?: boolean;
  abortSignal?: AbortSignal;
  bestEffort?: boolean;
  onError?: (err: unknown, payload: NormalizedOutboundPayload) => void;
  onPayload?: (payload: NormalizedOutboundPayload) => void;
  mirror?: {
    sessionKey: string;
    agentId?: string;
    text?: string;
    mediaUrls?: string[];
  };
}): Promise<OutboundDeliveryResult[]> {
  const { cfg, channel, to, payloads } = params;
  const accountId = params.accountId;
  const deps = params.deps;
  const abortSignal = params.abortSignal;
  const sendSignal = params.deps?.sendSignal ?? sendMessageSignal;
  const results: OutboundDeliveryResult[] = [];
  const handler = await createChannelHandler({
    cfg,
    channel,
    to,
    deps,
    accountId,
    replyToId: params.replyToId,
    threadId: params.threadId,
    gifPlayback: params.gifPlayback,
  });
  const textLimit = handler.chunker
    ? resolveTextChunkLimit(cfg, channel, accountId, {
        fallbackLimit: handler.textChunkLimit,
      })
    : undefined;
  const isSignalChannel = channel === "signal";
  const signalMaxBytes = isSignalChannel
    ? resolveChannelMediaMaxBytes({
        cfg,
        resolveChannelLimitMb: ({ cfg, accountId }) =>
          cfg.channels?.signal?.accounts?.[accountId]?.mediaMaxMb ??
          cfg.channels?.signal?.mediaMaxMb,
        accountId,
      })
    : undefined;

  const sendTextChunks = async (text: string) => {
    throwIfAborted(abortSignal);
    if (!handler.chunker || textLimit === undefined) {
      results.push(await handler.sendText(text));
      return;
    }
    for (const chunk of handler.chunker(text, textLimit)) {
      throwIfAborted(abortSignal);
      results.push(await handler.sendText(chunk));
    }
  };

  const sendSignalText = async (text: string, styles: SignalTextStyleRange[]) => {
    throwIfAborted(abortSignal);
    return {
      channel: "signal" as const,
      ...(await sendSignal(to, text, {
        maxBytes: signalMaxBytes,
        accountId: accountId ?? undefined,
        textMode: "plain",
        textStyles: styles,
      })),
    };
  };

  const sendSignalTextChunks = async (text: string) => {
    throwIfAborted(abortSignal);
    let signalChunks =
      textLimit === undefined
        ? markdownToSignalTextChunks(text, Number.POSITIVE_INFINITY)
        : markdownToSignalTextChunks(text, textLimit);
    if (signalChunks.length === 0 && text) {
      signalChunks = [{ text, styles: [] }];
    }
    for (const chunk of signalChunks) {
      throwIfAborted(abortSignal);
      results.push(await sendSignalText(chunk.text, chunk.styles));
    }
  };

  const sendSignalMedia = async (caption: string, mediaUrl: string) => {
    throwIfAborted(abortSignal);
    const formatted = markdownToSignalTextChunks(caption, Number.POSITIVE_INFINITY)[0] ?? {
      text: caption,
      styles: [],
    };
    return {
      channel: "signal" as const,
      ...(await sendSignal(to, formatted.text, {
        mediaUrl,
        maxBytes: signalMaxBytes,
        accountId: accountId ?? undefined,
        textMode: "plain",
        textStyles: formatted.styles,
      })),
    };
  };
  const normalizedPayloads = normalizeOutboundPayloads(payloads);
  for (const payload of normalizedPayloads) {
    try {
      throwIfAborted(abortSignal);
      params.onPayload?.(payload);
      if (payload.mediaUrls.length === 0) {
        if (isSignalChannel) {
          await sendSignalTextChunks(payload.text);
        } else {
          await sendTextChunks(payload.text);
        }
        continue;
      }

      let first = true;
      for (const url of payload.mediaUrls) {
        throwIfAborted(abortSignal);
        const caption = first ? payload.text : "";
        first = false;
        if (isSignalChannel) {
          results.push(await sendSignalMedia(caption, url));
        } else {
          results.push(await handler.sendMedia(caption, url));
        }
      }
    } catch (err) {
      if (!params.bestEffort) throw err;
      params.onError?.(err, payload);
    }
  }
  if (params.mirror && results.length > 0) {
    const mirrorText = resolveMirroredTranscriptText({
      text: params.mirror.text,
      mediaUrls: params.mirror.mediaUrls,
    });
    if (mirrorText) {
      await appendAssistantMessageToSessionTranscript({
        agentId: params.mirror.agentId,
        sessionKey: params.mirror.sessionKey,
        text: mirrorText,
      });
    }
  }
  return results;
}