//
//  CircularSliderView.swift
//  fiveConstant
//
//  Created by 李建 on 2023/2/6.
//

// 弧形温度调节组件

import SwiftUI

struct CircularSliderView: View {
    @State var roomInfo: RoomInfo
    @State var temperatureValue: CGFloat
    @State var angleValue: CGFloat
    var onSetValue: ((Int)->Void)?
    let config = Config(minimumValue: 0,
                        maximumValue: 14,
                        totalValue: 14.0,
                        knobRadius: 18.0,
                        radius: 105.0)
    init(roomInfo: RoomInfo) {
        self.roomInfo = roomInfo
        let value = CGFloat(roomInfo.set_temp!)
        self.temperatureValue = value
        let fixAngle = (value - 16) / config.totalValue * (270 * .pi / 180)
        self.angleValue = fixAngle * 180 / .pi
    }
    var body: some View {
        ZStack {
            Circle()
                .trim(from: 0.125, to: 0.875)
                .stroke(roomInfo.power! ? Color("MainColor") : Color(hex: 0xF0F5F6, alpha: 1), lineWidth: 20)
                .frame(width: config.radius * 2, height: config.radius * 2)
                .rotationEffect(.degrees(90))
            
            ZStack {
                Circle()
                    .fill(Color.white)
                    .frame(width: config.knobRadius * 2, height: config.knobRadius * 2)
                    .padding(10)
                    .shadow(radius: 11, y: 5)
                    .offset(y: -config.radius)
                    .rotationEffect(Angle.degrees(angleValue))
                    .zIndex(5)
                    .gesture(DragGesture(minimumDistance: 0.0)
                    .onChanged({ value in
                        change(location: value.location)
                    })
                        .onEnded({ _ in
                            self.onSetValue!(Int(temperatureValue))
                        })
                    )
                Circle()
                    .fill(Color("MainColor"))
                    .frame(width: 12, height: 12)
                    .offset(y: -config.radius)
                    .zIndex(6)
                    .rotationEffect(Angle.degrees(angleValue))
                // 两头的小圆点
                Circle()
                    .fill(roomInfo.power! ? Color("MainColor") : Color(hex: 0xF0F5F6, alpha: 1))
                    .frame(width: 19, height: 19)
                    .offset(y: -config.radius)
                Circle()
                    .fill(roomInfo.power! ? Color("MainColor") : Color(hex: 0xF0F5F6, alpha: 1))
                    .frame(width: 19, height: 19)
                    .offset(y: -config.radius)
                    .rotationEffect(Angle.degrees(270))
                    
            }
            .rotationEffect(.degrees(225)) //
            HStack(spacing:0) {
                Text("\(String.init(format: "%.f", temperatureValue))")
                                            .font(.system(size: 60))
                                            .foregroundColor(Color("SecondColor"))
                                            .bold()
                Text("℃").font(.system(size: 20)).padding(.bottom, 30)
            }
        }
    }
    private func change(location: CGPoint) {
       
        let vector = CGVector(dx: location.x, dy: location.y)

        let angle = atan2(vector.dy - (config.knobRadius + 10), vector.dx - (config.knobRadius + 10)) + .pi/2.0

        let fixedAngle = angle < 0.0 ? angle + 2.0 * .pi : angle

        let value = fixedAngle / (270 * .pi / 180) * config.totalValue

        if value >= config.minimumValue && value <= config.maximumValue {
            temperatureValue = value + 16
            angleValue = fixedAngle * 180 / .pi
        }
    }
    
}

extension CircularSliderView {
    func onDragEnd(perform action: @escaping (Int)->Void) ->Self {
        var copy = self
        copy.onSetValue = action
        return copy
    }
}



struct Config {
    let minimumValue: CGFloat
    let maximumValue: CGFloat
    let totalValue: CGFloat
    let knobRadius: CGFloat
    let radius: CGFloat
}

struct CircularSliderView_Previews: PreviewProvider {
    static let json = """
    {"record_id":"1t7svi03170copjp9iimtd3z005isbfj","name":"样板间","home_id":"1t7svi01jj7copaplj7q47n170kd6hw6","home_name":"李建的家","is_master":true,"control_number":"1","user_id":"","power":true,"set_temp":21,"air_quality":0,"co2":0,"temperature":7,"humidity":0,"mode":2,"fan_speed":4,"fan_value":1,"timer_status":false,"duration":0}
    """.data(using: .utf8)!
    static var previews: some View {
        let decoder = JSONDecoder()
        let product = try? decoder.decode(RoomInfo.self, from: json)
        CircularSliderView(roomInfo: product!)
    }
}