//
//  AppRestrictShieldSettingsVC.swift
//  QuickLocation
//

import PhotosUI
import UIKit

@available(iOS 16.0, *)
final class AppRestrictShieldSettingsVC: BaseViewController {
    
    override var isNavigationBarHidden: Bool { false }
    
    private let titleField = UITextField()
    private let subtitleField = UITextField()
    private let buttonField = UITextField()
    private let preview = UIImageView()
    private var config = AppRestrictManager.shared.shieldConfig

    override func viewDidLoad() {
        super.viewDidLoad()
        view.backgroundColor = UIColor(hexStr: "#FAFAFA")
        title = "锁定界面设置"
        navigationItem.rightBarButtonItem = UIBarButtonItem(title: "保存", style: .done, target: self, action: #selector(save))

        let stack = UIStackView()
        stack.axis = .vertical
        stack.spacing = 12
        view.addSubview(stack)
        stack.layoutChain.top(kNaviHeight + 20).left(16).right(16)

        func makeField(_ placeholder: String, text: String) -> UITextField {
            let f = UITextField()
            f.placeholder = placeholder
            f.text = text
            f.borderStyle = .roundedRect
            f.font = .systemFont(ofSize: 15)
            f.backgroundColor = .white
            return f
        }

        titleField.text = config.title
        subtitleField.text = config.subtitle
        buttonField.text = config.primaryButtonLabel
        [titleField, subtitleField, buttonField].forEach {
            $0.borderStyle = .roundedRect
            $0.font = .systemFont(ofSize: 15)
            $0.backgroundColor = .white
            stack.addArrangedSubview($0)
            $0.layoutChain.height(44)
        }
        titleField.placeholder = "标题"
        subtitleField.placeholder = "副标题"
        buttonField.placeholder = "按钮文案"

        let presetLab = UILabel()
        presetLab.text = "预设图集"
        presetLab.font = .systemFont(ofSize: 14, weight: .bold)
        stack.addArrangedSubview(presetLab)

        let presetRow = UIStackView()
        presetRow.axis = .horizontal
        presetRow.spacing = 10
        presetRow.distribution = .fillEqually
        [("默认", AppRestrictShieldConfig.ImageSource.presetDefault),
         ("专注", .presetFocus),
         ("平静", .presetCalm)].forEach { title, source in
            let btn = UIButton(type: .system)
            btn.setTitle(title, for: .normal)
            btn.backgroundColor = .white
            btn.layer.cornerRadius = 8
            btn.tag = source.hashValue
            btn.addAction(UIAction { [weak self] _ in
                self?.config.imageSource = source
                self?.refreshPreview()
            }, for: .touchUpInside)
            presetRow.addArrangedSubview(btn)
            btn.layoutChain.height(40)
        }
        stack.addArrangedSubview(presetRow)

        let albumBtn = UIButton(type: .system)
        albumBtn.setTitle("从相册选择", for: .normal)
        albumBtn.backgroundColor = UIColor(hexStr: "#16B3FF")
        albumBtn.setTitleColor(.white, for: .normal)
        albumBtn.layer.cornerRadius = 10
        albumBtn.addTarget(self, action: #selector(pickAlbum), for: .touchUpInside)
        stack.addArrangedSubview(albumBtn)
        albumBtn.layoutChain.height(44)

        preview.contentMode = .scaleAspectFit
        preview.backgroundColor = .white
        preview.layer.cornerRadius = 12
        preview.clipsToBounds = true
        stack.addArrangedSubview(preview)
        preview.layoutChain.height(180)

        refreshPreview()
    }

    private func refreshPreview() {
        preview.image = AppRestrictSharedStore.loadShieldImage()
    }

    @objc private func save() {
        config.title = titleField.text?.trimmingCharacters(in: .whitespacesAndNewlines).nilIfEmpty ?? AppRestrictShieldConfig.default.title
        config.subtitle = subtitleField.text?.trimmingCharacters(in: .whitespacesAndNewlines).nilIfEmpty ?? AppRestrictShieldConfig.default.subtitle
        config.primaryButtonLabel = buttonField.text?.trimmingCharacters(in: .whitespacesAndNewlines).nilIfEmpty ?? AppRestrictShieldConfig.default.primaryButtonLabel
        AppRestrictManager.shared.shieldConfig = config
        DLToast.showSuccess(text: "已保存")
        navigationController?.popViewController(animated: true)
    }

    @objc private func pickAlbum() {
        var conf = PHPickerConfiguration(photoLibrary: .shared())
        conf.filter = .images
        conf.selectionLimit = 1
        let picker = PHPickerViewController(configuration: conf)
        picker.delegate = self
        present(picker, animated: true)
    }
}

@available(iOS 16.0, *)
extension AppRestrictShieldSettingsVC: PHPickerViewControllerDelegate {
    func picker(_ picker: PHPickerViewController, didFinishPicking results: [PHPickerResult]) {
        picker.dismiss(animated: true)
        guard let provider = results.first?.itemProvider,
              provider.canLoadObject(ofClass: UIImage.self) else { return }
        provider.loadObject(ofClass: UIImage.self) { [weak self] object, _ in
            guard let image = object as? UIImage else { return }
            DispatchQueue.main.async {
                guard let self else { return }
                if AppRestrictManager.shared.saveCustomShieldImage(image) {
                    self.config.imageSource = .album
                    self.refreshPreview()
                } else {
                    DLToast.show(text: "图片保存失败")
                }
            }
        }
    }
}

private extension String {
    var nilIfEmpty: String? { isEmpty ? nil : self }
}