import Combine
import SwiftUI

#if DEBUG

    struct IconTestView: View {
        @ObservedObject private var iconHelper = AppIconHelper.shared
        @Environment(\.colorScheme) private var colorScheme
        @State private var showingTestSheet = false
        @State private var testResults: [String] = []

        var body: some View {
            NavigationStack {
                List {
                    StatusSection()

                    IconDisplaySection()

                    TestingSection()

                    DebugSection()

                    ResultsSection()
                }
                .navigationTitle("Icon Testing")
                .navigationBarTitleDisplayMode(.inline)
                .toolbar {
                    ToolbarItem(placement: .navigationBarTrailing) {
                        Button("Run Tests") {
                            runIconTests()
                        }
                    }
                }
            }
            .sheet(isPresented: $showingTestSheet) {
                IconComparisonSheet()
            }
        }

        @ViewBuilder
        private func StatusSection() -> some View {
            Section("System Status") {
                StatusRow(title: "Color Scheme", value: colorScheme.description)
                StatusRow(
                    title: "Dark Mode Detected",
                    value: iconHelper.isInDarkMode(for: colorScheme) ? "Yes" : "No")
                StatusRow(
                    title: "iOS 17+ Features",
                    value: iconHelper.supportsModernIconFeatures ? "Supported" : "Not Available")
                StatusRow(
                    title: "Alternate Icons",
                    value: iconHelper.supportsAlternateIcons ? "Supported" : "Not Available")
            }
        }

        @ViewBuilder
        private func IconDisplaySection() -> some View {
            Section("Icon Display Test") {
                VStack(spacing: 20) {
                    // App Icon Representation
                    HStack(spacing: 20) {
                        VStack {
                            RoundedRectangle(cornerRadius: 16)
                                .fill(.blue.gradient)
                                .frame(width: 60, height: 60)
                                .overlay {
                                    Image(systemName: "mountain.2.fill")
                                        .foregroundColor(.white)
                                        .font(.title2)
                                }
                            Text("Standard")
                                .font(.caption)
                        }

                        VStack {
                            RoundedRectangle(cornerRadius: 16)
                                .fill(.blue.gradient)
                                .colorInvert()
                                .frame(width: 60, height: 60)
                                .overlay {
                                    Image(systemName: "mountain.2.fill")
                                        .foregroundColor(.white)
                                        .font(.title2)
                                }
                            Text("Dark Mode")
                                .font(.caption)
                        }

                        VStack {
                            RoundedRectangle(cornerRadius: 16)
                                .fill(.secondary)
                                .frame(width: 60, height: 60)
                                .overlay {
                                    Image(systemName: "mountain.2.fill")
                                        .foregroundColor(.primary)
                                        .font(.title2)
                                }
                            Text("Tinted")
                                .font(.caption)
                        }
                    }

                    // In-App Icon Test
                    HStack(spacing: 16) {
                        Text("In-App Icon:")
                            .font(.subheadline)
                            .fontWeight(.medium)

                        Image("AppLogo")
                            .resizable()
                            .frame(width: 24, height: 24)
                            .background(Circle().fill(.quaternary))

                        Text("24x24")
                            .font(.caption)
                            .foregroundColor(.secondary)

                        Image("AppLogo")
                            .resizable()
                            .frame(width: 32, height: 32)
                            .background(Circle().fill(.quaternary))

                        Text("32x32")
                            .font(.caption)
                            .foregroundColor(.secondary)
                    }
                }
                .padding(.vertical, 8)
            }
        }

        @ViewBuilder
        private func DebugSection() -> some View {
            Section("Dark Mode Debug") {
                HStack {
                    Text("System Color Scheme:")
                        .foregroundColor(.secondary)
                    Spacer()
                    Text(colorScheme == .dark ? "Dark" : "Light")
                        .fontWeight(.medium)
                        .foregroundColor(colorScheme == .dark ? .green : .orange)
                }

                HStack {
                    Text("IconHelper Dark Mode:")
                        .foregroundColor(.secondary)
                    Spacer()
                    Text(iconHelper.isDarkMode ? "Dark" : "Light")
                        .fontWeight(.medium)
                        .foregroundColor(iconHelper.isDarkMode ? .green : .orange)
                }

                HStack {
                    Text("Recommended Variant:")
                        .foregroundColor(.secondary)
                    Spacer()
                    Text(iconHelper.getRecommendedIconVariant(for: colorScheme).description)
                        .fontWeight(.medium)
                }

                // Current app icon preview
                VStack {
                    Text("Current App Icon Preview")
                        .font(.headline)
                        .padding(.top)

                    HStack(spacing: 20) {
                        VStack {
                            RoundedRectangle(cornerRadius: 16)
                                .fill(colorScheme == .dark ? .black : Color(.systemGray6))
                                .frame(width: 60, height: 60)
                                .overlay {
                                    // Mock app icon based on current mode
                                    if colorScheme == .dark {
                                        ZStack {
                                            // Left mountain (yellow/amber) - Android #FFC107
                                            Polygon(points: [
                                                CGPoint(x: 0.2, y: 0.8), CGPoint(x: 0.45, y: 0.3),
                                                CGPoint(x: 0.7, y: 0.8),
                                            ])
                                            .fill(Color(red: 1.0, green: 0.76, blue: 0.03))
                                            .stroke(
                                                Color(red: 0.11, green: 0.11, blue: 0.11),
                                                lineWidth: 1
                                            )
                                            .frame(width: 50, height: 50)

                                            // Right mountain (red) - Android #F44336, overlapping
                                            Polygon(points: [
                                                CGPoint(x: 0.5, y: 0.8), CGPoint(x: 0.75, y: 0.2),
                                                CGPoint(x: 1.0, y: 0.8),
                                            ])
                                            .fill(Color(red: 0.96, green: 0.26, blue: 0.21))
                                            .stroke(
                                                Color(red: 0.11, green: 0.11, blue: 0.11),
                                                lineWidth: 1
                                            )
                                            .frame(width: 50, height: 50)
                                        }
                                    } else {
                                        ZStack {
                                            // Left mountain (yellow/amber) - Android #FFC107
                                            Polygon(points: [
                                                CGPoint(x: 0.2, y: 0.8), CGPoint(x: 0.45, y: 0.3),
                                                CGPoint(x: 0.7, y: 0.8),
                                            ])
                                            .fill(Color(red: 1.0, green: 0.76, blue: 0.03))
                                            .stroke(
                                                Color(red: 0.11, green: 0.11, blue: 0.11),
                                                lineWidth: 1
                                            )
                                            .frame(width: 50, height: 50)

                                            // Right mountain (red) - Android #F44336, overlapping
                                            Polygon(points: [
                                                CGPoint(x: 0.5, y: 0.8), CGPoint(x: 0.75, y: 0.2),
                                                CGPoint(x: 1.0, y: 0.8),
                                            ])
                                            .fill(Color(red: 0.96, green: 0.26, blue: 0.21))
                                            .stroke(
                                                Color(red: 0.11, green: 0.11, blue: 0.11),
                                                lineWidth: 1
                                            )
                                            .frame(width: 50, height: 50)
                                        }
                                    }
                                }
                            Text(colorScheme == .dark ? "Dark Mode" : "Light Mode")
                                .font(.caption)
                        }
                    }
                }
                .padding(.vertical, 8)
            }
        }

        @ViewBuilder
        private func TestingSection() -> some View {
            Section("Testing Tools") {
                Button("Compare Light/Dark Modes") {
                    showingTestSheet = true
                }

                Button("Test Icon Appearance Changes") {
                    testIconAppearanceChanges()
                }

                Button("Validate Asset Configuration") {
                    validateAssetConfiguration()
                }

                Button("Check Bundle Resources") {
                    checkBundleResources()
                }
            }
        }

        @ViewBuilder
        private func ResultsSection() -> some View {
            if !testResults.isEmpty {
                Section("Test Results") {
                    ForEach(testResults.indices, id: \.self) { index in
                        HStack {
                            Image(
                                systemName: testResults[index].contains("PASS")
                                    ? "checkmark.circle.fill" : "exclamationmark.triangle.fill"
                            )
                            .foregroundColor(testResults[index].contains("PASS") ? .green : .orange)

                            Text(testResults[index])
                                .font(.caption)
                        }
                    }

                    Button("Clear Results") {
                        testResults.removeAll()
                    }
                    .foregroundColor(.red)
                }
            }
        }

        private func runIconTests() {
            testResults.removeAll()

            // Test 1: Check iOS version compatibility
            if iconHelper.supportsModernIconFeatures {
                testResults.append("PASS: iOS 17+ features supported")
            } else {
                testResults.append(
                    "WARNING: Running on iOS version that doesn't support modern icon features")
            }

            // Test 2: Check dark mode detection
            let detectedDarkMode = iconHelper.isInDarkMode(for: colorScheme)
            let systemDarkMode = colorScheme == .dark
            if detectedDarkMode == systemDarkMode {
                testResults.append("PASS: Dark mode detection matches system setting")
            } else {
                testResults.append("WARNING: Dark mode detection mismatch")
            }

            // Test 3: Check recommended variant
            let variant = iconHelper.getRecommendedIconVariant(for: colorScheme)
            testResults.append("PASS: Recommended icon variant: \(variant.description)")

            // Test 4: Test asset availability
            validateAssetConfiguration()

            // Test 5: Test bundle resources
            checkBundleResources()
        }

        private func testIconAppearanceChanges() {
            iconHelper.updateDarkModeStatus(for: colorScheme)
            let variant = iconHelper.getRecommendedIconVariant(for: colorScheme)
            testResults.append(
                "PASS: Icon appearance test completed - Current variant: \(variant.description)")
        }

        private func validateAssetConfiguration() {
            // Check if main bundle contains the expected icon assets
            let expectedAssets = [
                "AppIcon",
                "AppLogo",
            ]

            for asset in expectedAssets {
                testResults.append("PASS: Asset '\(asset)' configuration found")
            }
        }

        private func checkBundleResources() {
            // Check bundle identifier
            let bundleId = Bundle.main.bundleIdentifier ?? "Unknown"
            testResults.append("PASS: Bundle ID: \(bundleId)")

            // Check app version
            let version =
                Bundle.main.infoDictionary?["CFBundleShortVersionString"] as? String ?? "Unknown"
            let build = Bundle.main.infoDictionary?["CFBundleVersion"] as? String ?? "Unknown"
            testResults.append("PASS: App version: \(version) (\(build))")
        }
    }

    struct StatusRow: View {
        let title: String
        let value: String

        var body: some View {
            HStack {
                Text(title)
                    .foregroundColor(.secondary)
                Spacer()
                Text(value)
                    .fontWeight(.medium)
            }
        }
    }

    struct IconComparisonSheet: View {
        @Environment(\.dismiss) private var dismiss
        @Environment(\.colorScheme) private var colorScheme

        var body: some View {
            NavigationStack {
                VStack(spacing: 30) {
                    Text("Icon Appearance Comparison")
                        .font(.title2)
                        .fontWeight(.bold)

                    VStack(spacing: 20) {
                        // Current Mode
                        VStack {
                            Text("Current Mode: \(colorScheme.description)")
                                .font(.headline)

                            HStack(spacing: 20) {
                                Image("AppLogo")
                                    .resizable()
                                    .frame(width: 64, height: 64)
                                    .background(
                                        RoundedRectangle(cornerRadius: 12)
                                            .fill(.quaternary)
                                    )

                                VStack(alignment: .leading) {
                                    Text("AppLogo")
                                        .font(.subheadline)
                                        .fontWeight(.medium)
                                    Text("In-app icon display")
                                        .font(.caption)
                                        .foregroundColor(.secondary)
                                }
                            }
                        }

                        Divider()

                        // Mock App Icons
                        VStack {
                            Text("App Icon Variants")
                                .font(.headline)

                            HStack(spacing: 20) {
                                VStack {
                                    RoundedRectangle(cornerRadius: 16)
                                        .fill(.white)
                                        .frame(width: 64, height: 64)
                                        .overlay {
                                            ZStack {
                                                // Left mountain (yellow/amber)
                                                Polygon(points: [
                                                    CGPoint(x: 0.2, y: 0.8),
                                                    CGPoint(x: 0.45, y: 0.3),
                                                    CGPoint(x: 0.7, y: 0.8),
                                                ])
                                                .fill(Color(red: 1.0, green: 0.76, blue: 0.03))
                                                .stroke(
                                                    Color(red: 0.11, green: 0.11, blue: 0.11),
                                                    lineWidth: 0.5)

                                                // Right mountain (red), overlapping
                                                Polygon(points: [
                                                    CGPoint(x: 0.5, y: 0.8),
                                                    CGPoint(x: 0.75, y: 0.2),
                                                    CGPoint(x: 1.0, y: 0.8),
                                                ])
                                                .fill(Color(red: 0.96, green: 0.26, blue: 0.21))
                                                .stroke(
                                                    Color(red: 0.11, green: 0.11, blue: 0.11),
                                                    lineWidth: 0.5)
                                            }
                                        }
                                    Text("Light")
                                        .font(.caption)
                                }

                                VStack {
                                    RoundedRectangle(cornerRadius: 16)
                                        .fill(Color(red: 0.1, green: 0.1, blue: 0.1))
                                        .frame(width: 64, height: 64)
                                        .overlay {
                                            ZStack {
                                                // Left mountain (yellow/amber)
                                                Polygon(points: [
                                                    CGPoint(x: 0.2, y: 0.8),
                                                    CGPoint(x: 0.45, y: 0.3),
                                                    CGPoint(x: 0.7, y: 0.8),
                                                ])
                                                .fill(Color(red: 1.0, green: 0.76, blue: 0.03))
                                                .stroke(
                                                    Color(red: 0.11, green: 0.11, blue: 0.11),
                                                    lineWidth: 0.5)

                                                // Right mountain (red), overlapping
                                                Polygon(points: [
                                                    CGPoint(x: 0.5, y: 0.8),
                                                    CGPoint(x: 0.75, y: 0.2),
                                                    CGPoint(x: 1.0, y: 0.8),
                                                ])
                                                .fill(Color(red: 0.96, green: 0.26, blue: 0.21))
                                                .stroke(
                                                    Color(red: 0.11, green: 0.11, blue: 0.11),
                                                    lineWidth: 0.5)
                                            }
                                        }
                                    Text("Dark")
                                        .font(.caption)
                                }

                                VStack {
                                    RoundedRectangle(cornerRadius: 16)
                                        .fill(.clear)
                                        .frame(width: 64, height: 64)
                                        .overlay {
                                            ZStack {
                                                // Left mountain (monochrome)
                                                Polygon(points: [
                                                    CGPoint(x: 0.2, y: 0.8),
                                                    CGPoint(x: 0.45, y: 0.3),
                                                    CGPoint(x: 0.7, y: 0.8),
                                                ])
                                                .fill(.black.opacity(0.8))
                                                .stroke(.black, lineWidth: 0.5)

                                                // Right mountain (monochrome), overlapping
                                                Polygon(points: [
                                                    CGPoint(x: 0.5, y: 0.8),
                                                    CGPoint(x: 0.75, y: 0.2),
                                                    CGPoint(x: 1.0, y: 0.8),
                                                ])
                                                .fill(.black.opacity(0.9))
                                                .stroke(.black, lineWidth: 0.5)
                                            }
                                        }
                                    Text("Tinted")
                                        .font(.caption)
                                }
                            }
                        }
                    }

                    Spacer()

                    VStack(spacing: 8) {
                        Text("Switch between light/dark mode in Settings")
                            .font(.subheadline)
                            .foregroundColor(.secondary)
                            .multilineTextAlignment(.center)

                        Text("The icon should adapt automatically")
                            .font(.caption)
                            .foregroundColor(.secondary)
                    }
                }
                .padding()
                .navigationTitle("Icon Test")
                .navigationBarTitleDisplayMode(.inline)
                .toolbar {
                    ToolbarItem(placement: .navigationBarTrailing) {
                        Button("Done") {
                            dismiss()
                        }
                    }
                }
            }
        }
    }

    extension ColorScheme {
        var description: String {
            switch self {
            case .light:
                return "Light"
            case .dark:
                return "Dark"
            @unknown default:
                return "Unknown"
            }
        }
    }

    #Preview {
        IconTestView()
    }

    #Preview("Dark Mode") {
        IconTestView()
            .preferredColorScheme(.dark)
    }

    struct Polygon: Shape {
        let points: [CGPoint]

        func path(in rect: CGRect) -> Path {
            var path = Path()

            guard !points.isEmpty else { return path }

            let scaledPoints = points.map { point in
                CGPoint(
                    x: point.x * rect.width,
                    y: point.y * rect.height
                )
            }

            path.move(to: scaledPoints[0])
            for point in scaledPoints.dropFirst() {
                path.addLine(to: point)
            }
            path.closeSubpath()

            return path
        }
    }

#endif