/**
 * GenerateAudio Executor
 *
 * Unified executor for generateAudio (TTS) nodes.
 * Used by both executeWorkflow and regenerateNode.
 */

import type { GenerateAudioNodeData, SelectedModel } from "@/types";
import { buildGenerateHeaders } from "@/store/utils/buildApiHeaders";
import { runWithFallback } from "./runWithFallback";
import { executePopiartTask } from "./popiartTaskClient";
import type { NodeExecutionContext } from "./types";
import { buildPromptFromConnectedTextItems } from "./textInputPrompt";
import { buildDefaultParametersFromSchema, mergeSchemaDefaults } from "@/utils/modelSchemaDefaults";
import { readAudioGenerationConfig } from "@/utils/generationConfig";
import { createDefaultAudioModel } from "@/store/utils/defaultImageModel";

export interface GenerateAudioOptions {
  /** When true, falls back to stored inputPrompt if no connections provide it. */
  useStoredFallback?: boolean;
}

export async function executeGenerateAudio(
  ctx: NodeExecutionContext,
  _options: GenerateAudioOptions = {}
): Promise<void> {
  const {
    node,
    getConnectedInputs,
    updateNodeData,
    getFreshNode,
    signal,
    providerSettings,
    addIncurredCost,
  } = ctx;

  void _options;

  const { text: connectedText, textItems: connectedTextItems = [] } = getConnectedInputs(node.id);

  // Get fresh node data from store
  const freshNode = getFreshNode(node.id);
  const nodeData = (freshNode?.data || node.data) as GenerateAudioNodeData;
  const nodeConfig = readAudioGenerationConfig(nodeData, createDefaultAudioModel());
  const hasConnectedText = connectedTextItems.length > 0 || Boolean(connectedText?.trim());

  const text = hasConnectedText
    ? buildPromptFromConnectedTextItems(connectedTextItems, connectedText, nodeConfig.prompt)
    : nodeConfig.prompt ?? null;

  if (!text) {
    updateNodeData(node.id, {
      status: "error",
      error: "Missing text input for audio generation",
    });
    throw new Error("Missing text input for audio generation");
  }

  if (!nodeConfig.selectedModel?.modelId) {
    updateNodeData(node.id, {
      status: "error",
      error: "No model selected",
    });
    throw new Error("No model selected");
  }

  updateNodeData(node.id, {
    inputPrompt: nodeConfig.prompt,
    status: "loading",
    error: null,
  });

  const runOnce = async (modelToUse: SelectedModel, parametersOverride?: Record<string, unknown>): Promise<void> => {
    const provider = modelToUse.provider;
    const headers = buildGenerateHeaders(provider, providerSettings);

    const requestPayload = {
      images: [],
      prompt: text,
      selectedModel: modelToUse,
      parameters: mergeSchemaDefaults(
        buildDefaultParametersFromSchema(nodeData.parameterSchema ?? []),
        parametersOverride ?? nodeConfig.parameters
      ),
      mediaType: "audio" as const,
    };

    let errorHandled = false;

    try {
      const result = await executePopiartTask(requestPayload, { headers, signal });

      // Handle audio response (audio or audioUrl field)
      const audioData = result.audio || result.audioUrl;
      if (result.success && audioData) {
        const timestamp = Date.now();
        const audioId = `${timestamp}`;

        // Add to node's audio history
        const newHistoryItem = {
          id: audioId,
          audio: audioData,
          timestamp,
          prompt: text || "",
          model: modelToUse.modelId || "",
        };
        const updatedHistory = [newHistoryItem, ...(nodeData.audioHistory || [])].slice(0, 50);

        updateNodeData(node.id, {
          outputAudio: audioData,
          status: "complete",
          error: null,
          audioHistory: updatedHistory,
          selectedAudioHistoryIndex: 0,
        });

        // Track cost
        if (modelToUse.provider === "fal" && modelToUse.pricing) {
          addIncurredCost(modelToUse.pricing.amount);
        }

      } else {
        updateNodeData(node.id, {
          status: "error",
          error: result.error || "Audio generation failed",
        });
        errorHandled = true;
        throw new Error(result.error || "Audio generation failed");
      }
    } catch (error) {
      if (error instanceof DOMException && error.name === "AbortError") {
        throw error;
      }

      let errorMessage = "Audio generation failed";
      if (error instanceof TypeError && error.message.includes("NetworkError")) {
        errorMessage = "Network error. Check your connection and try again.";
      } else if (error instanceof TypeError) {
        errorMessage = `Network error: ${error.message}`;
      } else if (error instanceof Error) {
        errorMessage = error.message;
      }

      if (!errorHandled) {
        updateNodeData(node.id, {
          status: "error",
          error: errorMessage,
        });
      }
      throw new Error(errorMessage);
    }
  };

  await runWithFallback({
    nodeId: node.id,
    primary: nodeConfig.selectedModel,
    fallback: nodeData.fallbackModel,
    fallbackParameters: nodeData.fallbackParameters,
    updateNodeData,
    runOnce,
    clearOutput: { outputAudio: null },
  });
}