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

import UIKit

enum HPSegControlType {
    case day
    case week
    case month
}

typealias SegControlValueChangeClosure = (HPSegControlType) -> Void
typealias DateSeletedClosure = (String) -> Void
class DateSwitchHeaderView: UIView {
    
    var segControl: DateSegmentView!
    var dateSelectedView: DateSelectView!
    var segControlType: HPSegControlType = .day
    var segControlValueChangeClosure: SegControlValueChangeClosure?
    var dateSelectedClosure: DateSeletedClosure?
    
    
    var selectedDateStr: String = ""
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        let segBackView = UIView(frame: CGRect(x: 0, y: 0, width: self.width, height: kScaleHeight(45.0)))
        segBackView.backgroundColor = UIColor.white
        self.addSubview(segBackView)
        //创建segment组件
        segControl = DateSegmentView(frame: CGRect.init(x: 0, y: kScaleHeight(15), width: kScaleWidth(258), height: kScaleWidth(30)))
        segControl.centerX = segBackView.center.x
        segControl.titles = ["日".localized, "周".localized, "月".localized];
        segControl.selectedClosure = { [weak self] index in
            guard let `self` = self else { return }
            self.segControlValueChange(index: index)
        }
        segBackView.addSubview(segControl)
        
        //创建日期选择组件
        dateSelectedView = DateSelectView(frame: CGRect(x: 0, y: segBackView.height, width: self.width, height: self.height - segBackView.height))
        dateSelectedView.backgroundColor = UIColor.white
        dateSelectedView.dateStr = DateClass.todayString().pregReplace(pattern: "-", with: "/")
        dateSelectedView.dateSelectClosure = { [weak self] (dateStr, isforward) in
            guard let `self` = self else { return }
            self.dateSelectChange(dateStr: dateStr, isforward: isforward)
        }
        self.addSubview(dateSelectedView)
    }
    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    fileprivate func segControlValueChange(index: Int) {
        if index == 0 {
            segControlType = .day
            let dateFormat = DateFormatter()
            dateFormat.dateFormat = "yyyy/MM/dd"
            self.dateSelectedView.dateStr = dateFormat.string(from: Date())
        }else if index == 1 {
            segControlType = .week
            self.dateSelectedView.dateStr = DateClass.todayString().weekRegion()
        }else {
            segControlType = .month
            let monthStr = DateClass.todayString().monthRegion().prefix(7)
            self.dateSelectedView.dateStr = monthStr.description
        }
        
        if let segControlClosure = self.segControlValueChangeClosure {
            segControlClosure(segControlType)
        }
    }
    
    fileprivate func dateSelectChange(dateStr: String, isforward: Bool) {
        
        if segControlType == .day {
            let dateString = dateStr.pregReplace(pattern: "/", with: "-")
            selectedDateStr = isforward ? DateClass.dateStringOffset(from: dateString, offset: 1) : DateClass.dateStringOffset(from: dateString, offset: -1)
            if selectedDateStr > DateClass.todayString() {
                SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                return
            }
            
            if selectedDateStr < "2019-01-01" {
                SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                return
            }
            self.dateSelectedView.dateStr = selectedDateStr.pregReplace(pattern: "-", with: "/")
        }
        
        if segControlType == .week {
            var dateString = ""
            let weekRegionComps = dateStr.components(separatedBy: "-")
            if weekRegionComps.count == 2 {
                selectedDateStr = ""
                if isforward {     //下一周
                    let nextDateStr = weekRegionComps[1].pregReplace(pattern: "/", with: "-")
                    selectedDateStr = DateClass.dateStringOffset(from: nextDateStr, offset: 1)
                    if selectedDateStr > DateClass.todayString() {
                        SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                        return
                    }
                }else {            //前一周
                    let lastDateStr = weekRegionComps[0].pregReplace(pattern: "/", with: "-")
                    selectedDateStr = DateClass.dateStringOffset(from: lastDateStr, offset: -7)
                    if selectedDateStr < "2019-01-01" {
                        SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                        return
                    }
                }
                dateString = selectedDateStr.weekRegion()
            }
            self.dateSelectedView.dateStr = dateString
        }
        
        if segControlType == .month {
            var dateString = ""
            selectedDateStr = ""
            let monthComps = dateStr.components(separatedBy: "/")
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd"
            if monthComps.count == 2 {
                let year = (monthComps[0] as NSString).integerValue
                let month = (monthComps[1] as NSString).integerValue
                if isforward {     //下个月
                    let monthEnd = DateClass.endOfMonth(year: year, month: month)
                    let nextDateStr = dateFormatter.string(from: monthEnd)
                    selectedDateStr = DateClass.dateStringOffset(from: nextDateStr, offset: 1)
                    if selectedDateStr > DateClass.todayString() {
                        SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                        return
                    }
                }else {            //上个月
                    let monthStart = DateClass.startOfMonth(year: year, month: month)
                    let lastDateStr = dateFormatter.string(from: monthStart)
                    selectedDateStr = DateClass.dateStringOffset(from: lastDateStr, offset: -1)
                    if selectedDateStr < "2019-01-01" {
                        SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                        return
                    }
                }
                dateString = selectedDateStr.monthRegion()
            }
            self.dateSelectedView.dateStr = dateString.prefix(7).description
        }
        if let dateSelectedClosure = self.dateSelectedClosure {
            dateSelectedClosure(selectedDateStr)
        }
    }
    
    /// 外部调用切换日期
    func switchDate(isforward: Bool) {
        if isforward {
            dateSelectedView.forwardAction()
            return
        }
        dateSelectedView.backwardAction()
    }
    
    
    /// 是否允许向前或者向后滚动日期
    ///
    /// - Returns: isEnable
    func isforwardEnable(isforward: Bool) -> Bool {
        let dateStr = dateSelectedView.dateStr!
        switch segControlType {
        case .day:
            let dateString = dateStr.pregReplace(pattern: "/", with: "-")
            let selectedDateStr = isforward ? DateClass.dateStringOffset(from: dateString, offset: 1) : DateClass.dateStringOffset(from: dateString, offset: -1)
            if selectedDateStr > DateClass.todayString() {
                SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                return false
            }
            if selectedDateStr < "2019-01-01" {
                SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                return false
            }
            return true
        case .week:
            let weekRegionComps = dateStr.components(separatedBy: "-")
            if weekRegionComps.count == 2 {
                if isforward {     //下一周
                    let nextDateStr = weekRegionComps[1].pregReplace(pattern: "/", with: "-")
                    let selectedDateStr = DateClass.dateStringOffset(from: nextDateStr, offset: 1)
                    if selectedDateStr > DateClass.todayString() {
                        SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                        return false
                    }
                }else {            //前一周
                    let lastDateStr = weekRegionComps[0].pregReplace(pattern: "/", with: "-")
                    let selectedDateStr = DateClass.dateStringOffset(from: lastDateStr, offset: -7)
                    if selectedDateStr < "2019-01-01" {
                        SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                        return false
                    }
                }
            }
            return true
        case .month:
            let monthComps = dateStr.components(separatedBy: "/")
            let dateFormatter = DateFormatter()
            dateFormatter.dateFormat = "yyyy-MM-dd"
            if monthComps.count == 2 {
                let year = (monthComps[0] as NSString).integerValue
                let month = (monthComps[1] as NSString).integerValue
                if isforward {     //下个月
                    let monthEnd = DateClass.endOfMonth(year: year, month: month)
                    let nextDateStr = dateFormatter.string(from: monthEnd)
                    let selectedDateStr = DateClass.dateStringOffset(from: nextDateStr, offset: 1)
                    if selectedDateStr > DateClass.todayString() {
                        SVProgressHUD.showInfo(withStatus: "该日期还没到呢!".localized)
                        return false
                    }
                }else {            //上个月
                    let monthStart = DateClass.startOfMonth(year: year, month: month)
                    let lastDateStr = dateFormatter.string(from: monthStart)
                    let selectedDateStr = DateClass.dateStringOffset(from: lastDateStr, offset: -1)
                    if selectedDateStr < "2019-01-01" {
                        SVProgressHUD.showInfo(withStatus: "日期不能再往前了!".localized)
                        return false
                    }
                }
            }
            return true
        }
    }
    
}