//
//  XF_Segment.swift
//  xingchuangke
//
//  Created by uen on 2020/6/28.
//  Copyright © 2020 Virgil. All rights reserved.
//

import UIKit

public typealias ChooseItemClosure = (_ item: Int) -> Void

class XF_Segment: UIView {
    private var chooseItemClosure: ChooseItemClosure?

    let lineHeight: CGFloat = 2
    let fontSize: UIFont = UIFont.systemFont(ofSize: 14)

    var defaultColor: UIColor = CommonUntils.getUIColorFromRGB(rgbValue: 0x333333, alpha: 1.0)
    var selectedColor: UIColor = CommonUntils.getUIColorFromRGB(rgbValue: 0x2094f5, alpha: 1.0)
    var selectedIndex = 0

    lazy var lineView: UIView = {
        let lineView = UIView.init()
        lineView.backgroundColor = self.selectedColor
        lineView.layer.cornerRadius = 1
        return lineView
    }()

    lazy var scrollView: UIScrollView = {
        let scrollView = UIScrollView.init(frame: self.bounds)
        scrollView.backgroundColor = UIColor.clear
        scrollView.showsVerticalScrollIndicator = false
        scrollView.showsHorizontalScrollIndicator = false
        return scrollView
    }()

    var titles: [String]

    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    public init(frame: CGRect, titles: [String], selectedIndex: NSInteger, defaultColor: UIColor, selectedColor: UIColor, chooseItemClosure:@escaping ChooseItemClosure) {

        self.titles = titles
        self.defaultColor = defaultColor
        self.selectedColor = selectedColor
        self.chooseItemClosure = chooseItemClosure
        self.selectedIndex = selectedIndex

        super.init(frame: frame)

        setup()
    }

    func setup() {

        self.addSubview(scrollView)

        let containerView = UIView.init(frame: self.bounds)
        containerView.backgroundColor = UIColor.clear
        scrollView.addSubview(containerView)

        var allBtnWidth: CGFloat = 0
        for i in 0 ..< self.titles.count {
            let btn = UIButton.init(type: .custom)
            btn.tag = 100 + i
            btn.setTitle(titles[i], for: .normal)
            btn.setTitleColor(self.defaultColor, for: .normal)
            btn.setTitleColor(self.selectedColor, for: .selected)
            btn.titleLabel?.font = self.fontSize
            containerView.addSubview(btn)
            btn.addTarget(self, action: #selector(btnClick), for: .touchUpInside)
            if i == self.selectedIndex {
                btn.isSelected = true
            }

            let textSize = titles[i].sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

            btn.frame = CGRect.init(x: allBtnWidth, y: 0, width: textSize.width + 30, height: self.bounds.size.height)
            allBtnWidth += (textSize.width + 30)
        }

//        let textSize = titles[0].sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

        var tits = ""
        for i in 0 ..< self.selectedIndex {
            tits += self.titles[i]
        }

        var textSize = tits.sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

        let x: CGFloat = textSize.width + CGFloat(self.selectedIndex) * 30.0

        textSize = titles[self.selectedIndex].sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

        lineView.frame = CGRect.init(x: x + 15, y: self.bounds.size.height - 2, width: textSize.width, height: 2)
        containerView.addSubview(lineView)

        let width = (allBtnWidth > self.bounds.size.width) ? allBtnWidth : self.bounds.size.width

        containerView.setSizeWidth(width: width)
        scrollView.contentSize = CGSize.init(width: width, height: self.bounds.size.height)
    }

    @objc func btnClick(sender: UIButton) {
        for view in sender.superview!.subviews {
            if view.isKind(of: UIButton.self) {
                let btn: UIButton = view as! UIButton
                if btn.tag == sender.tag {
                    btn.isSelected = true
                } else {
                    btn.isSelected = false
                }
            }
        }

        let index = sender.tag - 100
        var tits = ""
        for i in 0 ..< index {
            tits += self.titles[i]
        }

        var textSize = tits.sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

        let x: CGFloat = textSize.width + CGFloat(index) * 30.0

        textSize = titles[index].sizeWithText(font: self.fontSize, size: CGSize.init(width: 3000, height: 50))

        let width: CGFloat = textSize.width

        UIView.animate(withDuration: 0.5) {
            self.lineView.frame = CGRect.init(x: x + 15, y: self.bounds.size.height - 2, width: width, height: 2)
            if x + width + 30 > ScreenWidth {
                self.scrollView.contentOffset.x = x + width + 30 - ScreenWidth
            } else if index == 0 && self.scrollView.contentOffset.x > 0 {
                self.scrollView.contentOffset.x = 0
            }
        }

        chooseItemClosure!(sender.tag - 100)
    }

    /*
    // Only override draw() if you perform custom drawing.
    // An empty implementation adversely affects performance during animation.
    override func draw(_ rect: CGRect) {
        // Drawing code
    }
    */

}

extension String {
    //    func sizeWithText(font: UIFont, size: CGSize) -> CGSize {
    ////        let attributes = []
    //
    //
    //    }
    func sizeWithText(font: UIFont, size: CGSize) -> CGSize {
        let attributes = [NSAttributedString.Key.font: font]
        let option = NSStringDrawingOptions.usesLineFragmentOrigin
        let rect: CGRect = self.boundingRect(with: size, options: option, attributes: attributes, context: nil)
        return rect.size
    }
}