import SwiftUI
import Defaults

/// A view that displays the battery status with an icon and charging indicator.
struct BatteryView: View {

    var levelBattery: Float
    var isPluggedIn: Bool
    var isCharging: Bool
    var isInLowPowerMode: Bool
    var batteryWidth: CGFloat = 26
    var isForNotification: Bool

    var animationStyle: DynamicIslandAnimations = DynamicIslandAnimations()

    var icon: String = "battery.0"

    /// Determines the icon to display when charging.
    var iconStatus: String {
        if isCharging {
            return "bolt"
        }
        else if isPluggedIn {
            return "plug"
        }
        else {
            return ""
        }
    }

    /// Determines the color of the battery based on its status.
    var batteryColor: Color {
        if isInLowPowerMode {
            return .yellow
        } else if levelBattery <= 20 && !isCharging && !isPluggedIn {
            return .red
        } else if isCharging || isPluggedIn || levelBattery == 100 {
            return .green
        } else {
            return .white
        }
    }

    var body: some View {
        ZStack(alignment: .leading) {

            Image(systemName: icon)
                .resizable()
                .fontWeight(.thin)
                .aspectRatio(contentMode: .fit)
                .foregroundColor(.white.opacity(0.5))
                .frame(
                    width: batteryWidth + 1
                )

            RoundedRectangle(cornerRadius: 2.5)
                .fill(batteryColor)
                .frame(
                    width: CGFloat(((CGFloat(CFloat(levelBattery)) / 100) * (batteryWidth - 6))),
                    height: (batteryWidth - 2.75) - 18
                )
                .padding(.leading, 2)

            if iconStatus != "" && (isForNotification || Defaults[.showPowerStatusIcons]) {
                ZStack {
                    Image(iconStatus)
                        .resizable()
                        .aspectRatio(contentMode: .fit)
                        .foregroundColor(.white)
                        .frame(
                            width: 17,
                            height: 17
                        )
                }
                .frame(width: batteryWidth, height: batteryWidth)
            }
        }
    }
}

/// A view that displays detailed battery information and settings.
struct BatteryMenuView: View {
    
    var isPluggedIn: Bool
    var isCharging: Bool
    var levelBattery: Float
    var maxCapacity: Float
    var timeToFullCharge: Int
    var isInLowPowerMode: Bool
    var onDismiss: () -> Void

    @Environment(\.openURL) private var openURL

    var body: some View {
        VStack(alignment: .leading, spacing: 16) {

            HStack {
                Text("Battery Status")
                    .font(.headline)
                    .fontWeight(.semibold)
                Spacer()
                Text("\(Int(levelBattery))%")
                    .font(.headline)
                    .fontWeight(.semibold)
            }
            
            VStack(alignment: .leading, spacing: 8) {
                Text("Max Capacity: \(Int(maxCapacity))%")
                    .font(.subheadline)
                    .fontWeight(.regular)
                if isInLowPowerMode {
                    Label("Low Power Mode", systemImage: "bolt.circle")
                        .font(.subheadline)
                        .fontWeight(.regular)
                }
                if isCharging {
                    Label("Charging", systemImage: "bolt.fill")
                        .font(.subheadline)
                        .fontWeight(.regular)
                }
                if isPluggedIn {
                    Label("Plugged In", systemImage: "powerplug.fill")
                        .font(.subheadline)
                        .fontWeight(.regular)
                }
                if timeToFullCharge > 0 {
                    Label("Time to Full Charge: \(timeToFullCharge) min", systemImage: "clock")
                        .font(.subheadline)
                        .fontWeight(.regular)
                }
                if !isCharging && isPluggedIn && levelBattery >= 80 {
                    Label("Charging on Hold: Desktop Mode", systemImage: "desktopcomputer")
                        .font(.subheadline)
                        .fontWeight(.regular)
                }
                    
            }
            .padding(.vertical, 8)

            Divider().background(Color.white)

            Button(action: openBatteryPreferences) {
                Label("Battery Settings", systemImage: "gearshape")
                    .fontWeight(.regular)
            }
            .frame(maxWidth: .infinity)
            .buttonStyle(.plain)
            .padding(.vertical, 8)
        }
        .padding()
        .frame(width: 280)
        .foregroundColor(.white)
    }

    private func openBatteryPreferences() {
        if let url = URL(string: "x-apple.systempreferences:com.apple.preference.battery") {
            openURL(url)
            onDismiss()
        }
    }
}


/// A view that displays the battery status and allows interaction to show detailed information.
struct DynamicIslandBatteryView: View {
    
    @State var batteryWidth: CGFloat = 26
    var isCharging: Bool = false
    var isInLowPowerMode: Bool = false
    var isPluggedIn: Bool = false
    var levelBattery: Float = 0
    var maxCapacity: Float = 0
    var timeToFullCharge: Int = 0
    @State var isForNotification: Bool = false
    
    @State private var showPopupMenu: Bool = false
    @State private var isPressed: Bool = false
    @State private var isHoveringPopover: Bool = false

    @EnvironmentObject var vm: DynamicIslandViewModel

    var body: some View {
        HStack {
            if Defaults[.showBatteryPercentage] {
                ZStack(alignment: .trailing) {
                    Text("100%")
                        .font(.callout)
                        .hidden()
                    
                    Text("\(Int32(levelBattery))%")
                        .font(.callout)
                        .foregroundStyle(.white)
                        .lineLimit(1)
                }
                .fixedSize(horizontal: true, vertical: false)
            }
            BatteryView(
                levelBattery: levelBattery,
                isPluggedIn: isPluggedIn,
                isCharging: isCharging,
                isInLowPowerMode: isInLowPowerMode,
                batteryWidth: batteryWidth,
                isForNotification: isForNotification
            )
        }
        .scaleEffect(isPressed ? 0.95 : 1.0)
        .animation(.easeInOut(duration: 0.2), value: isPressed)
        .gesture(
            DragGesture(minimumDistance: 0)
                .onChanged { _ in
                    withAnimation {
                        isPressed = true
                    }
                }
                .onEnded { _ in
                    withAnimation {
                        isPressed = false
                        showPopupMenu.toggle()
                    }
                }
        )
        .popover(
            isPresented: $showPopupMenu,
            arrowEdge: .bottom) {
            BatteryMenuView(
                isPluggedIn: isPluggedIn,
                isCharging: isCharging,
                levelBattery: levelBattery,
                maxCapacity: maxCapacity,
                timeToFullCharge: timeToFullCharge,
                isInLowPowerMode: isInLowPowerMode,
                onDismiss: { 
                    showPopupMenu = false
                }
            )
            .onHover { hovering in
                isHoveringPopover = hovering
            }
        }
        .onChange(of: showPopupMenu) { _, _ in
            updateBatteryPopoverActiveState()
        }
        .onChange(of: isHoveringPopover) { _, _ in
            updateBatteryPopoverActiveState()
        }
    }

    private func updateBatteryPopoverActiveState() {
        vm.isBatteryPopoverActive = showPopupMenu && isHoveringPopover
    }
}

#Preview {
    DynamicIslandBatteryView(
        batteryWidth: 30,
        isCharging: false,
        isInLowPowerMode: false,
        isPluggedIn: true,
        levelBattery: 80,
        maxCapacity: 100,
        timeToFullCharge: 10,
        isForNotification: false
    ).frame(width: 200, height: 200)
}