package com.sw.dualscreen.utils

import android.content.Context
import android.net.Uri
import android.provider.OpenableColumns
import android.widget.Toast
import androidx.activity.result.ActivityResultCaller
import androidx.activity.result.ActivityResultLauncher
import androidx.activity.result.contract.ActivityResultContracts
import androidx.core.content.FileProvider
import java.io.File
import java.io.FileOutputStream

/**
 * 简洁相机工具类
 * 调用系统相机拍照并返回照片路径
 */
class CameraHelper(
    private val context: Context,
    caller: ActivityResultCaller,
    private val authority: String,
    private val onResult: (uri: Uri, filePath: String?) -> Unit
) {

    private lateinit var imageUri: Uri
    private val takePictureLauncher: ActivityResultLauncher<Uri>

    init {
        takePictureLauncher =
            caller.registerForActivityResult(ActivityResultContracts.TakePicture()) { success ->
                if (success) {
                    val path = getRealPathFromUri(context, imageUri)
                    onResult(imageUri, path)
                } else {
                    Toast.makeText(context, "拍照取消", Toast.LENGTH_SHORT).show()
                }
            }
    }

    /** 打开系统相机 */
    fun openCamera() {
        // 1. 创建存储图片的文件
        val photoFile = File(context.externalCacheDir, "IMG_${System.currentTimeMillis()}.jpg")
        photoFile.parentFile?.mkdirs() // 确保目录存在

        // 2. 生成 content:// Uri
        imageUri = FileProvider.getUriForFile(context, authority, photoFile)

        // 3. 启动相机
        takePictureLauncher.launch(imageUri)
    }

    /** 可选：将 content:// 转为实际路径 */
    private fun getRealPathFromUri(context: Context, uri: Uri): String? {
        var filePath: String? = null
        context.contentResolver.query(uri, null, null, null, null)?.use { cursor ->
            val nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME)
            cursor.moveToFirst()
            val fileName = cursor.getString(nameIndex)
            val file = File(context.cacheDir, fileName)
            context.contentResolver.openInputStream(uri)?.use { input ->
                FileOutputStream(file).use { output -> input.copyTo(output) }
            }
            filePath = file.absolutePath
        }
        return filePath
    }
}