/**
 * Generate3D Executor
 *
 * Executor for generate3d (3D model generation) nodes.
 * Extracted from nanoBananaExecutor's 3D handling code.
 */

import type { Generate3DNodeData, SelectedModel } from "@/types";
import { buildGenerateHeaders } from "@/store/utils/buildApiHeaders";
import { pollGenerateTask } from "./pollTaskCompletion";
import { runWithFallback } from "./runWithFallback";
import type { NodeExecutionContext } from "./types";

export interface Generate3DOptions {
  /** When true, falls back to stored inputImages/inputPrompt if no connections provide them. */
  useStoredFallback?: boolean;
}

export async function executeGenerate3D(
  ctx: NodeExecutionContext,
  options: Generate3DOptions = {}
): Promise<void> {
  const {
    node,
    getConnectedInputs,
    updateNodeData,
    getFreshNode,
    signal,
    providerSettings,
    addIncurredCost,
    generationsPath,
    trackSaveGeneration,
  } = ctx;

  const { useStoredFallback = false } = options;

  const { images: connectedImages, text: connectedText, dynamicInputs } = getConnectedInputs(node.id);

  // Get fresh node data from store
  const freshNode = getFreshNode(node.id);
  const nodeData = (freshNode?.data || node.data) as Generate3DNodeData;

  // Determine images and text (with optional fallback to stored values)
  let images: string[];
  let promptText: string | null;

  if (useStoredFallback) {
    images = connectedImages.length > 0 ? connectedImages : nodeData.inputImages;
    promptText = connectedText ?? nodeData.inputPrompt;
  } else {
    images = connectedImages;
    const promptFromDynamic = Array.isArray(dynamicInputs.prompt)
      ? dynamicInputs.prompt[0]
      : dynamicInputs.prompt;
    promptText = connectedText || promptFromDynamic || null;
  }

  // 3D models may work with just images (image-to-3d) or just text (text-to-3d)
  if (!promptText && images.length === 0) {
    updateNodeData(node.id, {
      status: "error",
      error: "Missing text or image input",
    });
    throw new Error("Missing text or image input");
  }

  updateNodeData(node.id, {
    inputImages: images,
    inputPrompt: promptText,
    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: promptText || "",
      selectedModel: modelToUse,
      parameters: parametersOverride ?? nodeData.parameters,
      dynamicInputs,
      mediaType: "3d" as const,
    };

    try {
      const response = await fetch("/api/generate", {
        method: "POST",
        headers,
        body: JSON.stringify(requestPayload),
        ...(signal ? { signal } : {}),
      });

      if (!response.ok) {
        const errorText = await response.text();
        let errorMessage = `HTTP ${response.status}`;
        try {
          const errorJson = JSON.parse(errorText);
          errorMessage = errorJson.error || errorMessage;
        } catch {
          if (errorText) errorMessage += ` - ${errorText.substring(0, 200)}`;
        }

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

      let result = await response.json();

      // Handle polling response (long-running Kie tasks)
      if (result.polling) {
        result = await pollGenerateTask({
          taskId: result.taskId,
          provider: result.pollProvider,
          modelId: result.pollModelId,
          modelName: result.pollModelName,
          mediaType: result.pollMediaType,
          headers,
          signal,
        });

        if (!result.success) {
          updateNodeData(node.id, {
            status: "error",
            error: result.error || "3D generation failed",
          });
          throw new Error(result.error || "3D generation failed");
        }
      }

      if (result.success && result.model3dUrl) {
        updateNodeData(node.id, {
          output3dUrl: result.model3dUrl,
          status: "complete",
          error: null,
          savedFilename: null,
          savedFilePath: null,
        });

        // Track cost if applicable
        if (modelToUse.pricing) {
          addIncurredCost(modelToUse.pricing.amount);
        }

        // Auto-save 3D model to generations folder if configured
        if (generationsPath) {
          const savePromise = fetch("/api/save-generation", {
            method: "POST",
            headers: { "Content-Type": "application/json" },
            body: JSON.stringify({
              directoryPath: generationsPath,
              model3d: result.model3dUrl,
              prompt: promptText,
            }),
          })
            .then((res) => res.json())
            .then((saveResult) => {
              if (saveResult.success && saveResult.filename) {
                updateNodeData(node.id, {
                  savedFilename: saveResult.filename,
                  savedFilePath: saveResult.filePath,
                });
              }
            })
            .catch((err) => {
              console.error("Failed to save 3D model:", err);
            });

          trackSaveGeneration(`3d-${Date.now()}`, savePromise);
        }
      } else {
        updateNodeData(node.id, {
          status: "error",
          error: result.error || "3D generation failed",
        });
        throw new Error(result.error || "3D generation failed");
      }
    } catch (error) {
      if (error instanceof DOMException && error.name === "AbortError") {
        throw error;
      }

      let errorMessage = "3D 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;
      }

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

  // Synthesize a SelectedModel for the primary if selectedModel is missing.
  const primaryModel: SelectedModel = nodeData.selectedModel ?? {
    provider: "fal",
    modelId: "",
    displayName: "",
  };

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

  await runWithFallback({
    nodeId: node.id,
    primary: primaryModel,
    fallback: nodeData.fallbackModel,
    fallbackParameters: nodeData.fallbackParameters,
    updateNodeData,
    runOnce,
    clearOutput: { output3dUrl: null },
  });
}