//
//  TSPhotoPickerManager.swift
//  AIEmoji
//
//  Created by 100Years on 2025/2/25.
//

import UIKit
import PhotosUI

class TSPhotoPickerManager: NSObject {
    
    // MARK: - Properties
    private weak var viewController: UIViewController?
    private var completionHandler: ((UIImage?,PHAsset?) -> Void)?
    private var completionSizeHandler: ((UIImage?,String?) -> Void)?
    private var imagePicker = UIImagePickerController()
    // MARK: - Initializers
    init(viewController: UIViewController) {
        self.viewController = viewController
    }
    
    // MARK: - Public Methods
    /// 打开照片选择器，单选一张照片
    func pickSinglePhoto(completion: @escaping (UIImage?,PHAsset?) -> Void) {
        self.completionHandler = completion
        // 检查相册权限
        checkPhotoLibraryPermission { [weak self] authorized in
            guard let self = self else { return }
            if authorized {
                self.openPhotoPicker()
            } else {
                self.showPermissionAlert()
            }
        }
    }
    
    // MARK: - Private Methods
    /// 检查相册权限
    private func checkPhotoLibraryPermission(completion: @escaping (Bool) -> Void) {
        let status = PHPhotoLibrary.authorizationStatus()
        switch status {
        case .authorized:
            completion(true)
        case .notDetermined:
            PHPhotoLibrary.requestAuthorization { newStatus in
                DispatchQueue.main.async {
                    completion(newStatus == .authorized)
                }
            }
        default:
            completion(false)
        }
    }
    
    /// 打开照片选择器
    private func openPhotoPicker() {
        TSToastShared.showLoading(containerView: viewController?.view)
        imagePicker = UIImagePickerController()
        imagePicker.sourceType = .photoLibrary
        imagePicker.delegate = self
        imagePicker.mediaTypes = ["public.image"] // 只选择照片
//        imagePicker.modalPresentationStyle = .custom
//        imagePicker.modalTransitionStyle = .crossDissolve
        if #available(iOS 13.0, *) {
            imagePicker.overrideUserInterfaceStyle = .dark
        }
        viewController?.present(imagePicker, animated: true){
            TSToastShared.hideLoading()
        }
    }
    
    /// 显示权限提示
    private func showPermissionAlert() {
        let alert = UIAlertController(
            title: "No photos permission".localized,
            message: "Please enable photo permission in settings to select photos".localized,
            preferredStyle: .alert
        )
        alert.addAction(UIAlertAction(title: "Cancel".localized, style: .cancel, handler: nil))
        alert.addAction(UIAlertAction(title: "Go to Settings".localized, style: .default) { _ in
            if let url = URL(string: UIApplication.openSettingsURLString) {
                UIApplication.shared.open(url, options: [:], completionHandler: nil)
            }
        })
        viewController?.present(alert, animated: true, completion: nil)
    }
    
    deinit {
        debugPrint("♻️♻️♻️ TSPhotoPickerManager -> TSPhotoPickerManager deinit ♻️♻️♻️")
    }
}

// MARK: - UIImagePickerControllerDelegate & UINavigationControllerDelegate (iOS 14 以下)
extension TSPhotoPickerManager: UIImagePickerControllerDelegate, UINavigationControllerDelegate {
    func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
//        picker.dismiss(animated: true) {
            if let image = info[.originalImage] as? UIImage {
                self.completionHandler?(image,info[.phAsset] as? PHAsset )
            } else {
                self.completionHandler?(nil,nil)
            }
//        }
        
        if completionSizeHandler == nil {
            picker.dismiss(animated: true, completion: nil)
        }

    }
    
    func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
//        self.completionHandler?(nil,nil)
//        if completionSizeHandler == nil {
            picker.dismiss(animated: true, completion: nil)
//        }
    }
}



extension TSPhotoPickerManager{
    
    func pickCustomSinglePhoto(completion: @escaping (UIImage?,String?) -> Void) {
        self.completionSizeHandler = completion
        pickSinglePhoto { [weak self] image,phAsset in
            guard let self = self else { return }
            self.completionSizeHandler?(image,nil)
            self.completionSizeHandler = nil
        }
    }
    
    // MARK: - Public Methods
    /// 打开照片选择器，单选一张照片
    func pickSinglePhoto(maxBitSize:Int, completion: @escaping (UIImage?,String?) -> Void) {
        self.completionSizeHandler = completion

        let maxmbSize = Int(Double(maxBitSize) / (1024 * 1024))
        pickSinglePhoto { [weak self] image,phAsset in
            guard let self = self else { return }
            if let image = image,let phAsset = phAsset {
                // 方法2：异步获取详细大小（不阻塞主线程）
                TSPhotoSizeHelper.getImageFileSizeAsync(asset: phAsset) {[weak self] size in
                    guard let self = self else { return }
                    
                    let mbSize = Double(size) / (1024 * 1024)
                    print("精确大小: \(mbSize) MB,size = \(size)")
                    if size > maxBitSize {
                        self.completionSizeHandler?(nil,String(format: "Photo must be smaller than %dMB.".localized, maxmbSize))
                    }else{
                        self.completionSizeHandler?(image,nil)
                        self.completionSizeHandler = nil
//                        imagePicker.dismiss(animated: true)
                    }
                }
            }else{
                if let image = image {
                    if image.isLargerThan(byteSize: maxBitSize) {
                        self.completionSizeHandler?(nil,String(format: "Photo must be smaller than %dMB.".localized, maxmbSize))
                    }else{
                        self.completionSizeHandler?(image,nil)
                        self.completionSizeHandler = nil
//                        imagePicker.dismiss(animated: true)
                    }
                }else{
                    self.completionSizeHandler?(nil,nil)
//                    imagePicker.dismiss(animated: true)
                }
            }
        }
    }
    
    func dismissPageVC(){
        self.imagePicker.view.isHidden = true
        self.imagePicker.dismiss(animated: true)
    }
}