Atoll/DynamicIsland/components/HoverButton.swift

//
//  HoverButton.swift
//  DynamicIsland
//
//  Created by Kraigo on 04.09.2024.
//

import SwiftUI

struct HoverButton: View {
    var icon: String
    var iconColor: Color = .white
    var scale: Image.Scale = .medium
    var pressEffect: PressEffect? = nil
    var contentTransition: ContentTransition = .symbolEffect
    var externalTriggerToken: Int? = nil
    var externalTriggerEffect: PressEffect? = nil
    var action: () -> Void
    
    @State private var isHovering = false
    @State private var pressOffset: CGFloat = 0
    @State private var wiggleAngle: Double = 0
    @State private var wiggleToken: Int = 0
    @State private var lastExternalTriggerToken: Int?

    var body: some View {
        let size = CGFloat(scale == .large ? 40 : 30)
        
        Button(action: {
            triggerPressEffect()
            action()
        }) {
            Rectangle()
                .fill(.clear)
                .contentShape(Rectangle())
                .frame(width: size, height: size)
                .overlay {
                    Capsule()
                        .fill(isHovering ? Color.gray.opacity(0.2) : .clear)
                        .frame(width: size, height: size)
                        .overlay {
                            let baseImage = Image(systemName: icon)
                                .foregroundColor(iconColor)
                                .contentTransition(contentTransition)
                                .font(scale == .large ? .largeTitle : .body)

                            if case .wiggle = pressEffect {
                                if #available(macOS 14.0, *) {
                                    baseImage
                                        .symbolEffect(
                                            .wiggle.byLayer,
                                            options: .nonRepeating,
                                            value: wiggleToken
                                        )
                                } else {
                                    baseImage
                                }
                            } else {
                                baseImage
                            }
                        }
                }
        }
        .buttonStyle(PlainButtonStyle())
        .offset(x: pressOffset)
        .rotationEffect(.degrees(wiggleAngle))
        .onHover { hovering in
            withAnimation(.smooth(duration: 0.3)) {
                isHovering = hovering
            }
        }
        .onChange(of: externalTriggerToken) { _, newToken in
            guard let newToken, newToken != lastExternalTriggerToken else { return }
            lastExternalTriggerToken = newToken
            triggerPressEffect(override: externalTriggerEffect)
        }
    }

    private func triggerPressEffect(override: PressEffect? = nil) {
        guard let effect = override ?? pressEffect else { return }

        switch effect {
        case .nudge(let amount):
            withAnimation(.spring(response: 0.2, dampingFraction: 0.55)) {
                pressOffset = amount
            }
            DispatchQueue.main.asyncAfter(deadline: .now() + 0.16) {
                withAnimation(.spring(response: 0.28, dampingFraction: 0.72)) {
                    pressOffset = 0
                }
            }
        case .wiggle(let direction):
            guard #available(macOS 14.0, *) else { return }
            wiggleToken += 1
            let angle: Double = direction == .clockwise ? 10 : -10

            withAnimation(.spring(response: 0.18, dampingFraction: 0.5)) {
                wiggleAngle = angle
            }

            DispatchQueue.main.asyncAfter(deadline: .now() + 0.18) {
                withAnimation(.spring(response: 0.32, dampingFraction: 0.72)) {
                    wiggleAngle = 0
                }
            }
        }
    }

    enum PressEffect {
        case nudge(CGFloat)
        case wiggle(WiggleDirection)
    }

    enum WiggleDirection {
        case clockwise
        case counterClockwise
    }
}