//
//  DateSegmentView.swift
//  HPlusFit
//
//  Created by lemo. on 2019/9/17.
//  Copyright © 2019 lemo. All rights reserved.
//

import UIKit
import RxGesture

typealias SegmentSelectedClosure  = (Int) -> Void
class DateSegmentView: UIView {
    
    let disposeBag = DisposeBag()
    var selectedClosure: SegmentSelectedClosure?
    private var lastTimeBtn: UIButton?
    
    //外部定义的值
    var selectIndex :Int?{
        willSet{
            let width = self.frame.size.width / CGFloat.init((self.titles?.count)!)
            UIView.animate(withDuration: 0.3) {
                self.bgView.left = ((newValue)?.int2Float)! * width
                self.topLabelView.left = -(((newValue)?.int2Float)!) * width
                self.bgView.layoutIfNeeded()
            }
        }
    }
    var titles: Array<String>? {
        didSet {
            setTitles()
        }
    }
    
    lazy var bgView: UIView = {
        let bg = UIView(frame: CGRect(x: 0, y: 0, width: bounds.width / 3.0, height: bounds.height))
        bg.gradient(colors: [kHexColor(0x59AAFF), kHexColor(0x2B75FF)], startPoint: CGPoint(x: 0, y: 0.5), endPoint: CGPoint(x: 1, y: 0.5), locations: [0, 1])
        return bg
    }()
    
    let topLabelView = UIView.init().then {
        $0.backgroundColor = .clear
    }
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        layer.cornerRadius = 3
        layer.borderWidth = 0.5
        layer.borderColor = kHexColor(0xDEDEDE).cgColor
        layer.masksToBounds = true
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
}

extension DateSegmentView {
    
    /// 设置分段标题
    func setTitles() {
        let width = self.frame.size.width / CGFloat.init((titles?.count)!)
        let height = self.frame.size.height
        for i in (titles?.indices)! {
            let titleBtn = UIButton()
            titleBtn.tag = 1000 + i;
            titleBtn.setTitle(titles?[i], for: .normal)
            titleBtn.setTitleColor(kHexColor(0x666666), for: .normal)
            titleBtn.setTitleColor(kHexColor(0xffffff), for: .selected)
            titleBtn.titleLabel?.font = SystemMediumFont(14)
            if i == 0 {
                titleBtn.isSelected = true
                titleBtn.titleLabel?.font = SystemMediumFont(16)
                lastTimeBtn = titleBtn
            }
            titleBtn.frame = CGRect.init(x: width*CGFloat.init(i), y: 0, width: width, height: height)
            titleBtn.rx.tapGesture()
                .when(UIGestureRecognizer.State.recognized)
                .subscribe(onNext: { [weak self] sender in
                    guard let `self` = self else { return }
                    self.selectedLabel(sender: sender)
                })
                .disposed(by: disposeBag)
            self.addSubview(titleBtn)
        }
        self.insertSubview(bgView, at: 0)
        topLabelView.frame = self.bounds
        bgView.addSubview(topLabelView)
    }
    
    func selectedLabel(sender: UITapGestureRecognizer) {
        let width = self.frame.size.width / CGFloat.init((self.titles?.count)!)
        UIView.animate(withDuration: 0.3, animations: {
            self.bgView.left = ((sender.view?.tag)! - 1000).int2Float * width
            self.topLabelView.left = -((sender.view?.tag)! - 1000).int2Float * width
            self.bgView.layoutIfNeeded()
        }) { [weak self] _ in
            // 选中切换颜色
            if let lastTimeBtn = self?.lastTimeBtn {
                lastTimeBtn.isSelected = !lastTimeBtn.isSelected
                lastTimeBtn.titleLabel?.font = SystemMediumFont(14)
            }
            if  let titleBtn = sender.view as? UIButton {
                titleBtn.isSelected = !titleBtn.isSelected
                titleBtn.titleLabel?.font = SystemMediumFont(16)
                self?.lastTimeBtn = titleBtn
            }
        }
        
        if let selected = selectedClosure {
            selected((sender.view?.tag)! - 1000)
        }
    }
}

extension Int {
    var int2Float: CGFloat {
        return CGFloat.init(self)
    }
}