/**
 * Builds the `HandlerCallback` the runtime invokes when an action wants to
 * publish a Farcaster cast — used both by the POST connector and by mention
 * replies. Attaches agent-generated media as cast embeds, honours
 * `FARCASTER_DRY_RUN`, sends via `FarcasterClient`, persists cast memories, and
 * routes success/failure to the supplied `onCompletion`/`onError` hooks.
 */
import type { Content, HandlerCallback, IAgentRuntime, Memory, UUID } from "@elizaos/core";
import type { Cast as NeynarCast } from "@neynar/nodejs-sdk/build/api";
import type { FarcasterClient } from "../client";
import type { CastId, FarcasterConfig } from "../types";
import { DEFAULT_FARCASTER_ACCOUNT_ID, normalizeFarcasterAccountId } from "./config";
import { createCastMemory, extractCastEmbedUrls, neynarCastToCast } from "./index";

export function standardCastHandlerCallback({
  client,
  runtime,
  config,
  roomId,
  onCompletion,
  onError,
  inReplyTo,
}: {
  inReplyTo?: CastId;
  client: FarcasterClient;
  runtime: IAgentRuntime;
  config: FarcasterConfig;
  roomId: UUID;
  onCompletion?: (casts: NeynarCast[], memories: Memory[]) => Promise<void>;
  onError?: (error: unknown) => Promise<void>;
}): HandlerCallback {
  const callback: HandlerCallback = async (content: Content): Promise<Memory[]> => {
    try {
      const accountId = normalizeFarcasterAccountId(
        (config as FarcasterConfig & { accountId?: string }).accountId ??
          DEFAULT_FARCASTER_ACCOUNT_ID
      );
      if (config.FARCASTER_DRY_RUN) {
        runtime.logger.info(`[Farcaster] Dry run: would have cast: ${content.text}`);
        return [];
      }

      // Attach agent-generated media as cast embeds so mention replies don't
      // silently drop attachments (the POST connector already does this) — #8990.
      const casts = await client.sendCast({
        content,
        inReplyTo,
        embeds: extractCastEmbedUrls(content),
      });

      if (casts.length === 0) {
        runtime.logger.warn("[Farcaster] No casts posted");
        return [];
      }

      const memories: Memory[] = [];
      for (let i = 0; i < casts.length; i++) {
        const cast = casts[i];
        runtime.logger.success(`[Farcaster] Published cast ${cast.hash}`);

        const memory = createCastMemory({
          roomId,
          senderId: runtime.agentId,
          runtime,
          cast: neynarCastToCast(cast),
          accountId,
        });

        if (i === 0) {
          memory.content.actions = content.actions;
        }

        await runtime.createMemory(memory, "messages");
        memories.push(memory);
      }

      if (onCompletion) {
        await onCompletion(casts, memories);
      }

      return memories;
    } catch (error) {
      runtime.logger.error(
        "[Farcaster] Error posting cast:",
        typeof error === "string" ? error : (error as Error).message
      );

      if (onError) {
        await onError(error);
      }

      return [];
    }
  };

  return callback;
}