//
//  EPLoginInputView.swift
//  YuMi
//
//  Created by AI on 2025-01-27.
//  登录输入框组件 - 支持区号、验证码、密码切换等完整功能
//

import UIKit
import SnapKit

/// 输入框配置
struct EPLoginInputConfig {
    var showAreaCode: Bool = false
    var showCodeButton: Bool = false
    var isSecure: Bool = false
    var icon: String?
    var placeholder: String
    var keyboardType: UIKeyboardType = .default
}

/// 输入框代理
protocol EPLoginInputViewDelegate: AnyObject {
    func inputViewDidRequestCode(_ inputView: EPLoginInputView)
    func inputViewDidSelectArea(_ inputView: EPLoginInputView)
}

/// 登录输入框组件
class EPLoginInputView: UIView {
    
    // MARK: - Properties
    
    weak var delegate: EPLoginInputViewDelegate?
    
    /// 输入内容变化回调
    var onTextChanged: ((String) -> Void)?
    
    private let stackView = UIStackView()
    
    // 区号区域
    private let areaStackView = UIStackView()
    private let areaCodeButton = UIButton(type: .custom)
    private let areaArrowImageView = UIImageView()
    private let areaTapButton = UIButton(type: .custom)
    
    // 输入框
    private let inputTextField = UITextField()
    private let iconImageView = UIImageView()
    
    // 眼睛按钮（密码可见性切换）
    private let eyeButton = UIButton(type: .custom)
    
    // 验证码按钮
    private let codeButton = UIButton(type: .custom)
    
    // 倒计时
    private var timer: DispatchSourceTimer?
    private var countdownSeconds = 60
    private var isCountingDown = false
    
    // 配置
    private var config: EPLoginInputConfig?
    
    /// 获取输入内容
    var text: String {
        return inputTextField.text ?? ""
    }
    
    // MARK: - Initialization
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }
    
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    deinit {
        stopCountdown()
    }
    
    // MARK: - Setup
    
    private func setupUI() {
        backgroundColor = EPLoginConfig.Colors.inputBackground
        layer.cornerRadius = EPLoginConfig.Layout.inputCornerRadius
        layer.borderWidth = EPLoginConfig.Layout.inputBorderWidth
        layer.borderColor = EPLoginConfig.Colors.inputBorder.cgColor
        
        // Main StackView
        stackView.axis = .horizontal
        stackView.alignment = .center
        stackView.distribution = .fill
        stackView.spacing = 8
        stackView.translatesAutoresizingMaskIntoConstraints = false
        addSubview(stackView)
        
        setupAreaCodeView()
        setupInputTextField()
        setupEyeButton()
        setupCodeButton()
        
        stackView.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(EPLoginConfig.Layout.inputHorizontalPadding)
            make.trailing.equalToSuperview().offset(-EPLoginConfig.Layout.inputHorizontalPadding)
            make.top.bottom.equalToSuperview()
        }
        
        // 默认隐藏所有可选组件
        areaStackView.isHidden = true
        eyeButton.isHidden = true
        codeButton.isHidden = true
        iconImageView.isHidden = true
    }
    
    private func setupAreaCodeView() {
        // 区号 StackView
        areaStackView.axis = .horizontal
        areaStackView.alignment = .center
        areaStackView.distribution = .fill
        areaStackView.spacing = 8
        areaStackView.translatesAutoresizingMaskIntoConstraints = false
        
        // 区号按钮
        areaCodeButton.setTitle("+86", for: .normal)
        areaCodeButton.setTitleColor(EPLoginConfig.Colors.inputText, for: .normal)
        areaCodeButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        areaCodeButton.isUserInteractionEnabled = false
        areaCodeButton.translatesAutoresizingMaskIntoConstraints = false
        
        // 箭头图标
        areaArrowImageView.image = kImage("login_area_arrow")
        areaArrowImageView.contentMode = .scaleAspectFit
        areaArrowImageView.isUserInteractionEnabled = false
        areaArrowImageView.translatesAutoresizingMaskIntoConstraints = false
        
        // 点击区域按钮
        areaTapButton.translatesAutoresizingMaskIntoConstraints = false
        areaTapButton.addTarget(self, action: #selector(handleAreaTap), for: .touchUpInside)
        
        areaStackView.addSubview(areaTapButton)
        areaStackView.addArrangedSubview(areaCodeButton)
        areaStackView.addArrangedSubview(areaArrowImageView)
        
        stackView.addArrangedSubview(areaStackView)
        
        areaTapButton.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        
        areaCodeButton.snp.makeConstraints { make in
            make.width.lessThanOrEqualTo(60)
        }
        
        areaArrowImageView.snp.makeConstraints { make in
            make.width.equalTo(12)
            make.height.equalTo(8)
        }
    }
    
    private func setupInputTextField() {
        // Icon (可选)
        iconImageView.contentMode = .scaleAspectFit
        iconImageView.tintColor = EPLoginConfig.Colors.icon
        iconImageView.translatesAutoresizingMaskIntoConstraints = false
        stackView.addArrangedSubview(iconImageView)
        
        iconImageView.snp.makeConstraints { make in
            make.size.equalTo(EPLoginConfig.Layout.inputIconSize)
        }
        
        // TextField
        inputTextField.textColor = EPLoginConfig.Colors.textLight
        inputTextField.font = .systemFont(ofSize: 14)
        inputTextField.tintColor = EPLoginConfig.Colors.textLight
        inputTextField.translatesAutoresizingMaskIntoConstraints = false
        inputTextField.addTarget(self, action: #selector(textFieldDidChange), for: .editingChanged)
        stackView.addArrangedSubview(inputTextField)
    }
    
    @objc private func textFieldDidChange() {
        onTextChanged?(inputTextField.text ?? "")
    }
    
    private func setupEyeButton() {
        eyeButton.translatesAutoresizingMaskIntoConstraints = false
        eyeButton.setImage(kImage(EPLoginConfig.Images.iconPasswordUnsee), for: .normal)
        eyeButton.setImage(kImage(EPLoginConfig.Images.iconPasswordSee), for: .selected)
        eyeButton.addTarget(self, action: #selector(handleEyeTap), for: .touchUpInside)
        stackView.addArrangedSubview(eyeButton)
        
        eyeButton.snp.makeConstraints { make in
            make.size.equalTo(24)
        }
    }
    
    private func setupCodeButton() {
        codeButton.translatesAutoresizingMaskIntoConstraints = false
        codeButton.setTitle(YMLocalizedString("XPLoginInputView0"), for: .normal)
        codeButton.setTitleColor(.white, for: .normal)
        codeButton.titleLabel?.font = .systemFont(ofSize: 12, weight: .medium)
        codeButton.titleLabel?.textAlignment = .center
        codeButton.titleLabel?.numberOfLines = 2
        codeButton.layer.cornerRadius = EPLoginConfig.Layout.codeButtonHeight / 2
        codeButton.backgroundColor = EPLoginConfig.Colors.codeButtonBackground
        codeButton.addTarget(self, action: #selector(handleCodeTap), for: .touchUpInside)
        stackView.addArrangedSubview(codeButton)
        
        codeButton.snp.makeConstraints { make in
            make.width.equalTo(EPLoginConfig.Layout.codeButtonWidth)
            make.height.equalTo(EPLoginConfig.Layout.codeButtonHeight)
        }
    }
    
    // MARK: - Configuration
    
    /// 配置输入框
    func configure(with config: EPLoginInputConfig) {
        self.config = config
        
        // 区号
        areaStackView.isHidden = !config.showAreaCode
        
        // Icon - 默认隐藏，不再使用
        iconImageView.isHidden = true
        
        // Placeholder（60% 白色）
        inputTextField.attributedPlaceholder = NSAttributedString(
            string: config.placeholder,
            attributes: [NSAttributedString.Key.foregroundColor: UIColor.white.withAlphaComponent(0.6)]
        )
        
        // 键盘类型
        inputTextField.keyboardType = config.keyboardType
        
        // 密码模式
        inputTextField.isSecureTextEntry = config.isSecure
        eyeButton.isHidden = !config.isSecure
        
        // 验证码按钮
        codeButton.isHidden = !config.showCodeButton
    }
    
    /// 设置区号
    func setAreaCode(_ code: String) {
        areaCodeButton.setTitle(code, for: .normal)
    }
    
    /// 清空输入
    func clearInput() {
        inputTextField.text = ""
    }
    
    /// 弹出键盘（自动聚焦输入框）
    func displayKeyboard() {
        inputTextField.becomeFirstResponder()
    }
    
    // MARK: - Actions
    
    @objc private func handleAreaTap() {
        delegate?.inputViewDidSelectArea(self)
    }
    
    @objc private func handleEyeTap() {
        eyeButton.isSelected.toggle()
        inputTextField.isSecureTextEntry = !eyeButton.isSelected
    }
    
    @objc private func handleCodeTap() {
        guard !isCountingDown else { return }
        delegate?.inputViewDidRequestCode(self)
    }
    
    // MARK: - Countdown
    
    /// 开始倒计时
    func startCountdown() {
        guard !isCountingDown else { return }
        
        isCountingDown = true
        countdownSeconds = 60
        codeButton.isEnabled = false
        codeButton.backgroundColor = EPLoginConfig.Colors.iconDisabled
        
        let queue = DispatchQueue.main
        let timer = DispatchSource.makeTimerSource(queue: queue)
        timer.schedule(deadline: .now(), repeating: 1.0)
        
        timer.setEventHandler { [weak self] in
            guard let self = self else { return }
            
            self.countdownSeconds -= 1
            
            if self.countdownSeconds <= 0 {
                self.stopCountdown()
                self.codeButton.setTitle(YMLocalizedString("XPLoginInputView1"), for: .normal)
            } else {
                self.codeButton.setTitle("\(self.countdownSeconds)s", for: .normal)
            }
        }
        
        timer.resume()
        self.timer = timer
    }
    
    /// 停止倒计时
    func stopCountdown() {
        guard let timer = timer else { return }
        
        timer.cancel()
        self.timer = nil
        isCountingDown = false
        
        codeButton.isEnabled = true
        codeButton.backgroundColor = EPLoginConfig.Colors.codeButtonBackground
        codeButton.setTitle(YMLocalizedString("XPLoginInputView0"), for: .normal)
    }
}