"use client";

import { useParams, useRouter } from "next/navigation";
import { useCallback, useEffect } from "react";
import { toast } from "sonner";
import { StyleProWorkspace } from "@/components/style-pro/StyleProWorkspace";
import { canvasService } from "@/services/canvas";
import { canvasSelectors, useCanvasStore } from "@/store/canvas";
import type {
  StyleProHistoryItem,
  StyleProPersistedState,
} from "@/lib/style-pro/config";
import { normalizeStyleProPersistedState } from "@/lib/style-pro/config";

export default function CanvasStyleProPage() {
  const router = useRouter();
  const routeParams = useParams();
  const id = String(routeParams?.id || "");

  const viewport = useCanvasStore(canvasSelectors.viewport);
  const selectedNodeIds = useCanvasStore(canvasSelectors.selectedNodeIds);
  const nodes = useCanvasStore(canvasSelectors.nodes);
  const styleProState = useCanvasStore((state) => state.styleProState);
  const addNode = useCanvasStore((state) => state.addNode);
  const loadCanvas = useCanvasStore((state) => state.loadCanvas);
  const selectNodes = useCanvasStore((state) => state.selectNodes);
  const setProject = useCanvasStore((state) => state.setProject);
  const setStyleProState = useCanvasStore((state) => state.setStyleProState);
  const getCanvasState = useCanvasStore((state) => state.getCanvasState);

  useEffect(() => {
    let cancelled = false;

    const loadPersistedStyleProState = async () => {
      if (!id) return;
      const currentState = useCanvasStore.getState();
      if (
        currentState.projectId === id &&
        (currentState.nodes.length > 0 ||
          currentState.styleProState.history.length > 0)
      ) {
        return;
      }

      const result = await canvasService.getProject(id);
      if (cancelled || !result.success || !result.data?.canvasData) return;

      const canvasData = result.data.canvasData;
      const latestState = useCanvasStore.getState();
      setProject(result.data.id, result.data.title);
      if (latestState.nodes.length === 0 && latestState.edges.length === 0) {
        loadCanvas(canvasData);
        return;
      }

      const nextStyleProState = normalizeStyleProPersistedState(
        canvasData.styleProState
      );
      if (nextStyleProState.history.length > 0) {
        setStyleProState(nextStyleProState);
      }
    };

    void loadPersistedStyleProState();

    return () => {
      cancelled = true;
    };
  }, [id, loadCanvas, setProject, setStyleProState]);

  const selectedImageNode =
    selectedNodeIds.length === 1
      ? nodes.find(
          (node) => node.id === selectedNodeIds[0] && node.type === "image"
        )
      : null;
  const selectedImageUrl = selectedImageNode
    ? String((selectedImageNode.data as any)?.src || "").trim()
    : "";

  const handleBack = useCallback(() => {
    router.push(`/canvas/${id}`);
  }, [id, router]);

  const handlePersistState = useCallback(
    async (nextState: StyleProPersistedState) => {
      useCanvasStore.getState().setStyleProState(nextState);
      const result = await canvasService.saveCanvasState(
        id,
        useCanvasStore.getState().getCanvasState()
      );
      if (!result.success) {
        console.error(
          "[CanvasStyleProPage] 保存风格化 PRO 状态失败:",
          result.error
        );
      }
    },
    [id]
  );

  const handleAddToCanvas = useCallback(
    async (item: StyleProHistoryItem) => {
      if (!item.resultImageUrl) {
        toast.error("没有可添加到画布的结果图");
        return;
      }

      const viewportX = viewport.x || 0;
      const viewportY = viewport.y || 0;
      const viewportZoom = viewport.zoom || 1;
      const stageWidth =
        typeof window !== "undefined" ? window.innerWidth : 1280;
      const stageHeight =
        typeof window !== "undefined" ? window.innerHeight : 720;
      const naturalWidth = Number(item.width || 0);
      const naturalHeight = Number(item.height || 0);
      const hasNaturalSize = naturalWidth > 0 && naturalHeight > 0;
      const maxPreviewEdge = 460;
      const fallbackSize = 360;
      const scale = hasNaturalSize
        ? Math.min(1, maxPreviewEdge / Math.max(naturalWidth, naturalHeight))
        : 1;
      const targetWidth = hasNaturalSize
        ? Math.max(160, Math.round(naturalWidth * scale))
        : fallbackSize;
      const targetHeight = hasNaturalSize
        ? Math.max(160, Math.round(naturalHeight * scale))
        : fallbackSize;
      const x =
        (stageWidth * 0.46 - viewportX) / viewportZoom - targetWidth / 2;
      const y =
        (stageHeight * 0.46 - viewportY) / viewportZoom - targetHeight / 2;

      const nodeId = addNode({
        type: "image",
        position: { x, y },
        size: { width: targetWidth, height: targetHeight },
        data: {
          src: item.resultImageUrl,
          originalSrc: item.sourceImageUrl,
          status: "completed",
          title: "风格化 PRO 结果",
          prompt: item.optionLabels.join(" / ") || "风格化 PRO",
          model: item.model || "Style Pro",
          metadata: {
            compareSourceUrl: item.sourceImageUrl,
            styleProHistoryId: item.id,
            styleProSelections: item.selections,
          },
        },
        connections: [],
      });

      selectNodes([nodeId]);
      const result = await canvasService.saveCanvasState(id, getCanvasState());
      if (!result.success) {
        toast.error(result.error || "保存画布失败");
        return;
      }
      toast.success("风格化 PRO 结果已添加到画布");
    },
    [
      addNode,
      getCanvasState,
      id,
      selectNodes,
      viewport.x,
      viewport.y,
      viewport.zoom,
    ]
  );

  return (
    <StyleProWorkspace
      canvasId={id}
      initialSourceImageUrl={selectedImageUrl}
      onAddToCanvas={handleAddToCanvas}
      onBack={handleBack}
      onPersistState={handlePersistState}
      persistedState={styleProState}
    />
  );
}