//
//  DatePickerPopupView.swift
//  MTP2_iOS
//
//  Created by zhongyuan on 2018/6/5.
//  Copyright © 2018年 zhongyuan.All rights reserved.
//

import UIKit

protocol  DatePickerPopupViewDelegate: class {
    /// 给页面上textfield赋值
    ///
    /// - Parameters:
    ///   - sender: DatePickerPopupView
    ///   - date: 当前选择的日期
    ///   - value: 当前选择的值
    func datePickerPopupView(_ sender: DatePickerPopupView,selectedDate date: Date, selectedDateString value: String)
}

class DatePickerPopupView: UIView {
    
    /// 时间选择器
    @IBOutlet weak var datePicker: UIDatePicker!
    /// 遮罩视图
    @IBOutlet weak var maskPopupView: UIView!
    /// 弹出框有效组件的背景view
    @IBOutlet weak var backgroundView: UIView!
    @IBOutlet weak var heightConstraint: NSLayoutConstraint!
    
    //MARK: TAG值
    
    /// 取消按钮tag
    private static let CANCELBUTTONTAG = 100
    /// 确认按钮tag
    private static let CONFIRMBUTTONTAG = 101
    
    /// delegate
    weak var delegate: DatePickerPopupViewDelegate?
    /// 选择日期的String值
    private var value = ""
    
    @IBAction func buttonOnPressed(_ sender: UIBarButtonItem) {
        switch sender.tag {
        case DatePickerPopupView.CANCELBUTTONTAG:
            hidePopupView()
        case DatePickerPopupView.CONFIRMBUTTONTAG:
            if value == "" {
                valueChange(datePicker: datePicker)
            }
            delegate?.datePickerPopupView(self, selectedDate: datePicker.date, selectedDateString: value)
        default:
            break
        }
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        
        bulidView()
    }
    
    /// 初始化设置
    private func bulidView() {
        /// 设置frame
        setNeedsLayout()
        layoutIfNeeded()
        /// 单击手势
        let ges = UITapGestureRecognizer(target: self, action: #selector(hidePopupView))
        self.maskPopupView.addGestureRecognizer(ges)
        
        /// datePicker
        datePicker.locale = Locale(identifier: "zh_cn")
        datePicker.timeZone = NSTimeZone.system
        datePicker.datePickerMode = .date
        datePicker.layer.backgroundColor = UIColor.white.cgColor
        datePicker.layer.masksToBounds = true
        datePicker.addTarget(self, action: #selector(valueChange(datePicker:)), for: .valueChanged)
    }
    
    /// 展示时间选择框
    ///
    /// - Parameters:
    ///   - currentDate: 当前显示的时间
    ///   - minimumDate: 可选择的最小时间
    func showInView(_ superView: UIView, currentDate: Date, minimumDate: Date? = nil, maximumDate: Date? = nil) {
        datePicker.date = currentDate
        datePicker.minimumDate = minimumDate
        datePicker.maximumDate = maximumDate
        superView.addSubview(self)
        self.heightConstraint.constant = 261.5
        UIView.animate(withDuration: 0.3, animations: {
            self.layoutIfNeeded()
        })
        self.frame = superView.frame
    }
    
    
    /// 移除当前 view
    @objc func hidePopupView() {
        self.heightConstraint.constant = 0
        UIView.animate(withDuration: 0.3, animations: {
            self.layoutIfNeeded()
        }) { (isSuccess) in
            self.removeFromSuperview()
        }
    }
    
    @objc func valueChange(datePicker: UIDatePicker) {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy-MM-dd"
        let dateString = formatter.string(from: datePicker.date)
        value = dateString
    }
}