import Base64 from "android.util.Base64";
import MimeTypeMap from "android.webkit.MimeTypeMap";
import ByteArrayOutputStream from 'java.io.ByteArrayOutputStream';

import File from "java.io.File";
import FileInputStream from "java.io.FileInputStream";
import FileOutputStream from "java.io.FileOutputStream";
import InputStream from 'java.io.InputStream';

// import IOException from "java.io.IOException";
import {ProcessFileOptions, NullableString} from '../interface'
type NullByteArray = ByteArray | null

function inputStreamToArray(inputStream : InputStream) : NullByteArray {
	try {
		let bos : ByteArrayOutputStream = new ByteArrayOutputStream()
		let bytes : ByteArray = new ByteArray(1024)

		do {
			let length = inputStream.read(bytes)
			if (length != -1) {
				bos.write(bytes, 0, length)
			} else {
				break
			}
		} while (true)
		bos.close()
		return bos.toByteArray()
	} catch (e : Throwable) {
		return null;
	}
}

function getMimeType(filePath : string):NullableString {
	const extension = MimeTypeMap.getFileExtensionFromUrl(filePath);
	if(extension == null) return null
	return MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension);
}

export function getResourcePath(path: string): string|null {
	let uri = path
	if (uri.startsWith("http") || uri.startsWith("<svg") || uri.startsWith("data:image/")) {
		return uri
	}
	if (uri.startsWith("file://")) {
		uri = uri.substring("file://".length)
	} else if (uri.startsWith("unifile://")) {
		uri = UTSAndroid.convert2AbsFullPath(uri)
	} else {
		uri = UTSAndroid.convert2AbsFullPath(uri)
		if (uri.startsWith("/android_asset/")){
			try {
				const context = UTSAndroid.getUniActivity()!;
				const inputStream = context.getResources()!.getAssets().open(path.replace('/android_asset/',''))
				inputStream.close();
				return uri
			} catch(e) {
				return null
			}
		}
	}
	const file = new File(uri)
	if(file.exists()){
		return uri
	}
	return null
}

export function fileToBase64(filePath : string) : NullableString {
	try {
		const context = UTSAndroid.getUniActivity()!;
		let path = filePath;
		let imageBytes : NullByteArray = null
		
		if (path.startsWith("file://")) {
			path = path.replace("file://", "")
		} else{
			// if(!path.startsWith("/storage") && !path.startsWith("/android_asset/"))
			// path = UTSAndroid.getResourcePath(path)
			path = UTSAndroid.convert2AbsFullPath(path)
		}
		
		if (path.startsWith("/android_asset/")) {
			imageBytes = inputStreamToArray(context.getResources()!.getAssets().open(path.replace('/android_asset/','')))
		} else {
			const file = new File(path)
			if(file.exists()){
				let fis: FileInputStream = new FileInputStream(file);
				imageBytes = inputStreamToArray(fis);
				fis.close();
			}
		}
		if(imageBytes == null) return null
		return Base64.encodeToString(imageBytes, Base64.DEFAULT)
	} catch (e) {
		return null
	}
}
export function fileToDataURL(filePath : string) : NullableString {
	const base64 = fileToBase64(filePath)
	const mimeType = getMimeType(filePath);
	if(base64 == null || mimeType == null) return null;
	return "data:" + mimeType + ";base64," + base64;
}


function getFileExtensionFromDataURL(dataURL: string): string{
	const commaIndex = dataURL.indexOf(",");
	const mimeType = dataURL.substring(0, commaIndex).replace("data:", "").replace(";base64", "");
	const mimeTypeParts = mimeType.split("/");
	return mimeTypeParts[1];
}
function dataURLToBytes(dataURL: string): ByteArray{
	const commaIndex = dataURL.indexOf(",");
	const base64 = dataURL.substring(commaIndex + 1);
	return Base64.decode(base64, Base64.DEFAULT);
}

export function dataURLToFile(dataURL: string, filename: NullableString = null):NullableString{
	try {
		const bytes = dataURLToBytes(dataURL);
		const name = filename ?? `${Date.now()}.${getFileExtensionFromDataURL(dataURL)}`;
		const cacheDir = UTSAndroid.getAppCachePath();
		const destFile = new File(cacheDir, name);
		const fos = new FileOutputStream(destFile)
		fos.write(bytes);
		fos.close();
		return `${cacheDir}${name}`
	} catch(e) {
		return null
	}
}


export function processFile(options: ProcessFileOptions){
	if(options.type == 'toBase64'){
		const res = fileToBase64(options.path)
		const err = 'fileToBase64: 解析失败'
		if(res != null){
			options.success?.(res)
			options.complete?.(res)
		} else {
			options.complete?.(err)
			options.fail?.(err)
		}
	} else if(options.type == 'toDataURL'){
		const res = fileToDataURL(options.path)
		const err = 'fileToDataURL: 解析失败'
		if(res != null){
			options.success?.(res)
			options.complete?.(res)
		} else {
			options.complete?.(err)
			options.fail?.(err)
		}
	} else if(options.type == 'toFile'){
		const res = dataURLToFile(options.path, options.filename)
		const err = 'dataURLToFile: 解析失败'
		if(res != null){
			options.success?.(res)
			options.complete?.(res)
		} else {
			options.complete?.(err)
			options.fail?.(err)
		}
	}
}