import type {
  CanvasConfigNodeMetadata,
  CanvasImageNodeMetadata,
  CanvasNode,
  CanvasNodeType,
  CanvasPosition,
} from "@/lib/canvas/types";
import type { HistoryItem } from "@/lib/image-workflow";

export const DEFAULT_NODE_WIDTH = 280;
export const DEFAULT_NODE_HEIGHT = 170;
export const DEFAULT_IMAGE_WIDTH = 320;
export const DEFAULT_IMAGE_HEIGHT = 240;

export const defaultCanvasConfig: CanvasConfigNodeMetadata = {
  model: "gpt-image-2-2k",
  size: "1024x1024",
  quality: "high",
  outputFormat: "png",
  preserveIdentity: true,
};

export function createCanvasNode(
  type: CanvasNodeType,
  position: CanvasPosition,
): CanvasNode {
  const id = crypto.randomUUID();

  if (type === "prompt") {
    return {
      id,
      type,
      title: "提示词",
      position,
      width: DEFAULT_NODE_WIDTH,
      height: DEFAULT_NODE_HEIGHT,
      metadata: {
        prompt: "描述你想生成的画面...",
      },
    };
  }

  if (type === "config") {
    return {
      id,
      type,
      title: "生成配置",
      position,
      width: DEFAULT_NODE_WIDTH,
      height: DEFAULT_NODE_HEIGHT,
      metadata: { ...defaultCanvasConfig },
    };
  }

  return {
    id,
    type,
    title: "参考图片",
    position,
    width: DEFAULT_IMAGE_WIDTH,
    height: DEFAULT_IMAGE_HEIGHT,
    metadata: {
      imageUrl: "",
      mode: "reference",
      status: "idle",
    },
  };
}

export function createImageNodeFromHistory(
  item: HistoryItem,
  position: CanvasPosition,
): CanvasNode {
  const size = getImageNodeSize(item);
  return {
    id: crypto.randomUUID(),
    type: "image",
    title: "历史图片",
    position,
    width: size.width,
    height: size.height,
    metadata: {
      historyId: item.id,
      imageUrl: item.imageUrl,
      mode: "reference",
      prompt: item.prompt,
      model: item.model,
      size: item.size,
      quality: item.quality,
      outputFormat: item.outputFormat,
      status: "success",
    },
  };
}

export function createImageNodeFromUpload(
  file: File,
  imageUrl: string,
  position: CanvasPosition,
): CanvasNode {
  return {
    id: crypto.randomUUID(),
    type: "image",
    title: file.name || "上传图片",
    position,
    width: DEFAULT_IMAGE_WIDTH,
    height: DEFAULT_IMAGE_HEIGHT,
    metadata: {
      imageUrl,
      mode: "reference",
      status: "success",
    },
  };
}

export function createImageResultNode(
  result: HistoryItem,
  position: CanvasPosition,
): CanvasNode {
  const size = getImageNodeSize(result);
  const metadata: CanvasImageNodeMetadata = {
    imageUrl: result.imageUrl,
    mode: "result",
    historyId: result.id,
    prompt: result.prompt,
    model: result.model,
    size: result.size,
    quality: result.quality,
    outputFormat: result.outputFormat,
    status: "success",
  };

  return {
    id: crypto.randomUUID(),
    type: "image",
    title: "生成结果",
    position,
    width: size.width,
    height: size.height,
    metadata,
  };
}

function getImageNodeSize(item: Pick<HistoryItem, "size">) {
  const match = /^(\d+)x(\d+)$/.exec(item.size || "");
  if (!match) {
    return { width: DEFAULT_IMAGE_WIDTH, height: DEFAULT_IMAGE_HEIGHT };
  }

  const naturalWidth = Number(match[1]);
  const naturalHeight = Number(match[2]);
  if (!naturalWidth || !naturalHeight) {
    return { width: DEFAULT_IMAGE_WIDTH, height: DEFAULT_IMAGE_HEIGHT };
  }

  const maxSide = 360;
  const minSide = 180;
  const scale = Math.min(maxSide / naturalWidth, maxSide / naturalHeight, 1);
  const imageWidth = Math.max(minSide, Math.round(naturalWidth * scale));
  const imageHeight = Math.max(minSide, Math.round(naturalHeight * scale));
  const padding = 16;
  const headerHeight = 34;
  const gap = 12;

  return {
    width: imageWidth + padding * 2,
    height: imageHeight + padding * 2 + headerHeight + gap,
  };
}