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import type { Edge, Node } from "@xyflow/react";

export type VeniceSource = {
  title: string;
  url: string;
  snippet: string;
};

export type VeniceVisualFact = {
  label: string;
  detail: string;
};

export type GenerateNodeResponse = {
  id: string;
  title: string;
  imageUrl: string;
  imagePrompt: string;
  summary: string;
  visualFacts: VeniceVisualFact[];
  query: string;
  sources: VeniceSource[];
  suggestedBranches: string[];
};

export type VeniceNodeData = {
  title: string;
  imageUrl: string;
  imagePrompt: string;
  summary: string;
  visualFacts: VeniceVisualFact[];
  query: string;
  sources: VeniceSource[];
  suggestedBranches: string[];
  parentId?: string;
};

export type VeniceCanvasNode = Node<VeniceNodeData, "veniceImage">;

export type StoredCanvas = {
  nodes: VeniceCanvasNode[];
  edges: Edge[];
};

export const NODE_WIDTH = 760;
export const NODE_HEIGHT = 820;
export const BRANCH_X_GAP = 880;
export const BRANCH_Y_GAP = 560;

export function createCanvasNodeFromGeneration(
  generation: GenerateNodeResponse,
  position: { x: number; y: number },
  parentId?: string,
): VeniceCanvasNode {
  return {
    id: generation.id,
    type: "veniceImage",
    position,
    data: {
      title: generation.title,
      imageUrl: generation.imageUrl,
      imagePrompt: generation.imagePrompt,
      summary: generation.summary,
      visualFacts: generation.visualFacts,
      query: generation.query,
      sources: generation.sources,
      suggestedBranches: generation.suggestedBranches,
      parentId,
    },
  };
}

export function getBranchPosition(
  parentPosition: { x: number; y: number },
  siblingIndex: number,
): { x: number; y: number } {
  return {
    x: parentPosition.x + BRANCH_X_GAP,
    y: parentPosition.y + siblingIndex * BRANCH_Y_GAP,
  };
}

export function buildCanvasEdge(parentId: string, childId: string): Edge {
  return {
    id: `${parentId}-${childId}`,
    source: parentId,
    target: childId,
    type: "smoothstep",
    animated: true,
    style: {
      stroke: "#7ec8c2",
      strokeWidth: 2,
    },
  };
}

export function normalizeStoredCanvas(stored: unknown): StoredCanvas {
  if (!stored || typeof stored !== "object") {
    return { nodes: [], edges: [] };
  }

  const canvas = stored as Partial<StoredCanvas>;
  return {
    nodes: Array.isArray(canvas.nodes) ? canvas.nodes.map(normalizeStoredNode) : [],
    edges: Array.isArray(canvas.edges) ? canvas.edges : [],
  };
}

function normalizeStoredNode(node: VeniceCanvasNode): VeniceCanvasNode {
  const data = node.data || ({} as VeniceNodeData);
  const query = data.query || data.title || "this topic";

  return {
    ...node,
    type: "veniceImage",
    data: {
      title: data.title || query,
      imageUrl: data.imageUrl || "",
      imagePrompt: data.imagePrompt || "",
      summary: data.summary || `Generated visual search node for ${query}.`,
      visualFacts: Array.isArray(data.visualFacts) ? data.visualFacts : [],
      query,
      sources: Array.isArray(data.sources) ? data.sources : [],
      suggestedBranches: Array.isArray(data.suggestedBranches) ? data.suggestedBranches : [],
      parentId: data.parentId,
    },
  };
}