//
//  DebugAnimationSettingsView.swift
//  Feels
//
//  Debug-only view for experimenting with vote celebration animations.
//

import SwiftUI

// MARK: - Main Debug View

struct DebugAnimationSettingsView: View {
    @Environment(\.dismiss) private var dismiss
    @Environment(\.colorScheme) private var colorScheme
    @AppStorage(UserDefaultsStore.Keys.theme.rawValue, store: GroupUserDefaults.groupDefaults) private var theme: Theme = .system

    private var textColor: Color { theme.currentTheme.labelColor }

    @State private var selectedAnimation: CelebrationAnimationType = .vortexCheckmark
    @State private var isAnimating = false

    private var isDark: Bool { colorScheme == .dark }

    var body: some View {
        VStack(spacing: 0) {
            // Lab Header
            labHeader
                .padding(.top, 8)

            // Animation Picker - Horizontal Scroll Cards
            animationPicker
                .padding(.top, 16)

            // Preview Area
            previewArea
                .padding(.top, 20)
                .padding(.horizontal, 16)

            Spacer()
        }
        .background(
            ZStack {
                theme.currentTheme.bg
                // Subtle grid pattern for "lab" feel
                GridPatternView()
                    .opacity(isDark ? 0.03 : 0.02)
            }
            .ignoresSafeArea()
        )
        .navigationTitle("")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .navigationBarTrailing) {
                Button("Done") {
                    dismiss()
                }
            }
        }
    }

    // MARK: - Lab Header

    private var labHeader: some View {
        VStack(spacing: 6) {
            HStack(spacing: 8) {
                Image(systemName: "flask.fill")
                    .font(.title2)
                    .foregroundStyle(
                        LinearGradient(
                            colors: [.purple, .pink],
                            startPoint: .topLeading,
                            endPoint: .bottomTrailing
                        )
                    )

                Text("Animation Lab")
                    .font(.system(size: 24, weight: .bold, design: .rounded))
                    .foregroundColor(textColor)
            }

            Text("Experiment with vote celebrations")
                .font(.system(size: 14, weight: .medium, design: .rounded))
                .foregroundColor(.secondary)
        }
    }

    // MARK: - Animation Picker

    private var animationPicker: some View {
        ScrollView(.horizontal, showsIndicators: false) {
            HStack(spacing: 12) {
                ForEach(CelebrationAnimationType.allCases) { type in
                    AnimationCard(
                        type: type,
                        isSelected: selectedAnimation == type,
                        isDark: isDark
                    ) {
                        withAnimation(.spring(response: 0.3, dampingFraction: 0.7)) {
                            selectedAnimation = type
                        }
                    }
                }
            }
            .padding(.horizontal, 16)
            .padding(.vertical, 8)
        }
    }

    // MARK: - Preview Area

    private var previewArea: some View {
        VStack(spacing: 12) {
            // Current selection indicator
            HStack(spacing: 6) {
                Circle()
                    .fill(selectedAnimation.accentColor)
                    .frame(width: 8, height: 8)

                Text(selectedAnimation.rawValue)
                    .font(.system(size: 13, weight: .semibold, design: .monospaced))
                    .foregroundColor(selectedAnimation.accentColor)

                Text("—")
                    .foregroundColor(.secondary.opacity(0.5))

                Text(selectedAnimation.description)
                    .font(.system(size: 13, weight: .medium, design: .rounded))
                    .foregroundColor(.secondary)
            }

            // The animated voting view
            AnimatedVotingView(
                animationType: selectedAnimation,
                isAnimating: $isAnimating
            )
            .frame(height: 280)
            .background(
                RoundedRectangle(cornerRadius: 24)
                    .fill(isDark ? Color(.systemGray6) : .white)
                    .shadow(color: .black.opacity(isDark ? 0.3 : 0.08), radius: 20, x: 0, y: 8)
            )
            .overlay(
                RoundedRectangle(cornerRadius: 24)
                    .stroke(selectedAnimation.accentColor.opacity(0.3), lineWidth: 1)
            )
            .clipShape(RoundedRectangle(cornerRadius: 24))
        }
    }
}

// MARK: - Grid Pattern Background

struct GridPatternView: View {
    var body: some View {
        Canvas { context, size in
            let gridSize: CGFloat = 20
            for x in stride(from: 0, to: size.width, by: gridSize) {
                for y in stride(from: 0, to: size.height, by: gridSize) {
                    let rect = CGRect(x: x, y: y, width: 1, height: 1)
                    context.fill(Path(ellipseIn: rect), with: .color(.primary))
                }
            }
        }
    }
}

// MARK: - Animation Card

struct AnimationCard: View {
    let type: CelebrationAnimationType
    let isSelected: Bool
    let isDark: Bool
    let onTap: () -> Void

    @State private var isPressed = false

    var body: some View {
        Button(action: onTap) {
            VStack(spacing: 8) {
                // Icon
                ZStack {
                    Circle()
                        .fill(
                            isSelected
                                ? type.accentColor.opacity(0.2)
                                : (isDark ? Color(.systemGray5) : Color(.systemGray6))
                        )
                        .frame(width: 44, height: 44)

                    Image(systemName: type.icon)
                        .font(.system(size: 20, weight: .medium))
                        .foregroundColor(isSelected ? type.accentColor : .secondary)
                }

                // Name
                Text(type.rawValue)
                    .font(.system(size: 11, weight: .semibold, design: .rounded))
                    .foregroundColor(isSelected ? type.accentColor : .secondary)
            }
            .frame(width: 72, height: 80)
            .background(
                RoundedRectangle(cornerRadius: 16)
                    .fill(isDark ? Color(.systemGray6) : .white)
                    .shadow(
                        color: isSelected ? type.accentColor.opacity(0.3) : .black.opacity(0.05),
                        radius: isSelected ? 8 : 4,
                        x: 0,
                        y: isSelected ? 4 : 2
                    )
            )
            .overlay(
                RoundedRectangle(cornerRadius: 16)
                    .stroke(
                        isSelected ? type.accentColor : Color.clear,
                        lineWidth: 2
                    )
            )
            .scaleEffect(isPressed ? 0.95 : (isSelected ? 1.02 : 1.0))
        }
        .buttonStyle(PlainButtonStyle())
        .onLongPressGesture(minimumDuration: .infinity, pressing: { pressing in
            withAnimation(.easeInOut(duration: 0.15)) {
                isPressed = pressing
            }
        }, perform: {})
    }
}

// MARK: - Animated Voting View

struct AnimatedVotingView: View {
    let animationType: CelebrationAnimationType
    @Binding var isAnimating: Bool

    @State private var selectedMood: Mood = .great

    // Animation state
    @State private var animationScale: CGFloat = 1
    @State private var animationRotation: Angle = .zero
    @State private var animationOffset: CGSize = .zero

    var body: some View {
        ZStack {
            // The voting content (gets animated)
            DebugVotingContentView(selectedMood: $selectedMood) {
                triggerAnimation()
            }
            .opacity(isAnimating ? 0 : 1)
            .scaleEffect(animationScale)
            .rotation3DEffect(animationRotation, axis: (x: 0, y: 1, z: 0))
            .offset(animationOffset)

            // Animation overlay
            if isAnimating {
                CelebrationOverlayView(
                    animationType: animationType,
                    mood: selectedMood
                ) {
                    // Reset handled by triggerAnimation
                }
            }
        }
        .animation(.spring(response: 0.5, dampingFraction: 0.7), value: isAnimating)
    }

    private func triggerAnimation() {
        guard !isAnimating else { return }

        let impact = UIImpactFeedbackGenerator(style: .medium)
        impact.impactOccurred()

        // Set animation properties based on type
        withAnimation(.easeInOut(duration: 0.4)) {
            isAnimating = true

            switch animationType {
            case .vortexCheckmark:
                animationScale = 0.01
            case .explosionReveal:
                animationScale = 2.5
            case .flipReveal:
                animationRotation = .degrees(90)
            case .shatterReform:
                break
            case .pulseWave:
                animationScale = 0.9
            case .fireworks:
                animationScale = 0.8
            case .confettiCannon:
                animationScale = 0.95
            case .morphBlob:
                animationScale = 0.5
            case .zoomTunnel:
                animationScale = 0.01
            case .gravityDrop:
                animationOffset = CGSize(width: 0, height: 400)
            }
        }

        DispatchQueue.main.asyncAfter(deadline: .now() + animationType.duration) {
            withAnimation(.easeOut(duration: 0.3)) {
                isAnimating = false
                animationScale = 1
                animationRotation = .zero
                animationOffset = .zero
            }
        }
    }
}

// MARK: - Debug Voting Content View

struct DebugVotingContentView: View {
    @Binding var selectedMood: Mood
    let onVote: () -> Void

    var body: some View {
        VStack(spacing: 20) {
            Text("How are you feeling?")
                .font(.system(size: 18, weight: .semibold, design: .rounded))
                .foregroundColor(.primary)

            HStack(spacing: 12) {
                ForEach(Mood.allValues, id: \.self) { mood in
                    Button {
                        selectedMood = mood
                        onVote()
                    } label: {
                        mood.icon
                            .resizable()
                            .scaledToFit()
                            .frame(width: 40, height: 40)
                            .padding(8)
                            .background(
                                Circle()
                                    .fill(mood.color.opacity(0.15))
                            )
                    }
                }
            }

            Text("Tap to vote")
                .font(.system(size: 12, weight: .medium, design: .rounded))
                .foregroundColor(.secondary)
        }
        .frame(maxWidth: .infinity, maxHeight: .infinity)
    }
}

// MARK: - Preview

#Preview {
    NavigationStack {
        DebugAnimationSettingsView()
    }
}