/**
 * 文件：imagelib.ts
 * 作用：图像相关工具（路径解析 / wikilink 处理 / 资源定位）。
 */

import { getBlobArrayBuffer } from "obsidian";
import { wxUploadImage } from "./wechat/weixin-api";
import { NMPSettings } from "./settings";
import { IsWasmReady, LoadWasm } from "./wasm/wasm";
import AssetsManager from "./assets";
import { convertJpegIfNeeded } from "./exif-orientation";

declare function GoWebpToJPG(data: Uint8Array): Uint8Array; // wasm 返回 Uint8Array
declare function GoWebpToPNG(data: Uint8Array): Uint8Array;
declare function GoAddWatermark(img: Uint8Array, watermark: Uint8Array): Uint8Array;

export function IsImageLibReady() {
  return IsWasmReady();
}

export async function PrepareImageLib() {
  await LoadWasm();
}

export function WebpToJPG(data: ArrayBuffer): Uint8Array {
  return GoWebpToJPG(new Uint8Array(data));
}

export function WebpToPNG(data: ArrayBuffer): Uint8Array {
  return GoWebpToPNG(new Uint8Array(data));
}

export function AddWatermark(img: ArrayBuffer, watermark: ArrayBuffer): Uint8Array {
  return GoAddWatermark(new Uint8Array(img), new Uint8Array(watermark));
}

export async function UploadImageToWx(data: Blob, filename: string, token: string, type?: string) {
  if (!IsImageLibReady()) {
    await PrepareImageLib(); 
  }

  try {
    // 公众号端仍然存在基于 EXIF 的旋转问题：
    // 统一将待上传的 JPEG 转为 PNG 并忽略 Orientation，避免出现倒置/倾斜。
    const converted = await convertJpegIfNeeded(data, filename);
    if (converted.changed) {
      data = converted.blob;
      filename = converted.filename;
    }
  } catch (error) {
    console.warn('[UploadImageToWx] convert to PNG failed, fallback to original', error);
  }
  
  const watermark = NMPSettings.getInstance().watermark;
  if (watermark != null && watermark != '') {
    const watermarkData = await AssetsManager.getInstance().readFileBinary(watermark);
    if (watermarkData == null) {
      throw new Error('水印图片不存在: ' + watermark);
    }
    const watermarkImg = AddWatermark(await data.arrayBuffer(), watermarkData);
    // AddWatermark 返回 Uint8Array，Blob 的类型签名对某些 TS 配置可能对 ArrayBufferLike 有严格区分
    // 此处使用其底层 ArrayBuffer 来构造 Blob，避免类型不兼容错误
    const bufferPart = watermarkImg.buffer as ArrayBuffer;
    data = new Blob([bufferPart], { type: data.type });
  }
  return await wxUploadImage(data, filename, token, type);
}