import SwiftUI

/**
 * QUIXZOOM Capture App — Huvudvy
 * 
 * 4 lägen:
 * 1. Recording Mode — Filma hela gatan
 * 2. Guided Mode — AI ger realtidsinstruktioner
 * 3. Mission Mode — Specifika uppgifter
 * 4. Adaptive Mode — AI planerar nästa observation
 */
struct ContentView: View {
    @StateObject private var captureManager = CaptureManager()
    @State private var selectedMode: CaptureSession.CaptureMode = .recording
    @State private var showingSettings = false
    
    var body: some View {
        NavigationView {
            VStack(spacing: 0) {
                // Status bar
                StatusBarView(captureManager: captureManager)
                
                // Kamera-vy
                CameraPreviewView(captureManager: captureManager)
                    .frame(maxHeight: .infinity)
                
                // AI Instruktion (om aktiv)
                if let instruction = captureManager.currentInstruction {
                    AIInstructionView(instruction: instruction)
                }
                
                // Kontroller
                ControlPanelView(
                    captureManager: captureManager,
                    selectedMode: $selectedMode
                )
            }
            .navigationTitle("QUIXZOOM Capture")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button(action: { showingSettings = true }) {
                        Image(systemName: "gear")
                    }
                }
            }
            .sheet(isPresented: $showingSettings) {
                SettingsView()
            }
        }
    }
}

// MARK: - Status Bar

struct StatusBarView: View {
    @ObservedObject var captureManager: CaptureManager
    
    var body: some View {
        HStack(spacing: 16) {
            // GPS-status
            HStack(spacing: 4) {
                Image(systemName: "location.fill")
                    .foregroundColor(gpsColor)
                Text("\(Int(captureManager.gpsSignal * 100))%")
                    .font(.caption)
            }
            
            // Kvalitet
            HStack(spacing: 4) {
                Image(systemName: "checkmark.shield")
                    .foregroundColor(qualityColor)
                Text("\(Int(captureManager.qualityScore * 100))%")
                    .font(.caption)
            }
            
            // Uppladdning
            if captureManager.uploadProgress > 0 && captureManager.uploadProgress < 1 {
                HStack(spacing: 4) {
                    ProgressView(value: captureManager.uploadProgress)
                        .frame(width: 40)
                    Text("\(Int(captureManager.uploadProgress * 100))%")
                        .font(.caption)
                }
            }
            
            Spacer()
            
            // Session-status
            if let session = captureManager.currentSession {
                Text(session.mode.rawValue.uppercased())
                    .font(.caption.bold())
                    .padding(.horizontal, 8)
                    .padding(.vertical, 4)
                    .background(session.status == .recording ? Color.red.opacity(0.2) : Color.gray.opacity(0.2))
                    .cornerRadius(4)
            }
        }
        .padding(.horizontal)
        .padding(.vertical, 8)
        .background(Color(.systemBackground))
    }
    
    var gpsColor: Color {
        if captureManager.gpsSignal > 0.8 { return .green }
        if captureManager.gpsSignal > 0.5 { return .yellow }
        return .red
    }
    
    var qualityColor: Color {
        if captureManager.qualityScore > 0.8 { return .green }
        if captureManager.qualityScore > 0.5 { return .yellow }
        return .red
    }
}

// MARK: - Camera Preview

struct CameraPreviewView: View {
    @ObservedObject var captureManager: CaptureManager
    
    var body: some View {
        ZStack {
            // Kamera-preview (placeholder)
            Rectangle()
                .fill(Color.black)
            
            // Inspelnings-indikator
            if captureManager.isRecording {
                VStack {
                    HStack {
                        Circle()
                            .fill(Color.red)
                            .frame(width: 12, height: 12)
                        Text("REC")
                            .font(.caption.bold())
                            .foregroundColor(.red)
                        Spacer()
                    }
                    .padding()
                    Spacer()
                }
            }
            
            // Grid overlay för komposition
            GeometryReader { geometry in
                Path { path in
                    let w = geometry.size.width
                    let h = geometry.size.height
                    
                    // Vertikala linjer
                    path.move(to: CGPoint(x: w/3, y: 0))
                    path.addLine(to: CGPoint(x: w/3, y: h))
                    path.move(to: CGPoint(x: 2*w/3, y: 0))
                    path.addLine(to: CGPoint(x: 2*w/3, y: h))
                    
                    // Horisontella linjer
                    path.move(to: CGPoint(x: 0, y: h/3))
                    path.addLine(to: CGPoint(x: w, y: h/3))
                    path.move(to: CGPoint(x: 0, y: 2*h/3))
                    path.addLine(to: CGPoint(x: w, y: 2*h/3))
                }
                .stroke(Color.white.opacity(0.3), lineWidth: 0.5)
            }
        }
    }
}

// MARK: - AI Instruction View

struct AIInstructionView: View {
    let instruction: AIInstruction
    
    var body: some View {
        VStack(alignment: .leading, spacing: 8) {
            HStack {
                Image(systemName: "brain.head.profile")
                    .foregroundColor(.blue)
                Text("AI Instruction")
                    .font(.caption.bold())
                    .foregroundColor(.blue)
                Spacer()
                Text(instruction.priority.uppercased())
                    .font(.caption2.bold())
                    .padding(.horizontal, 6)
                    .padding(.vertical, 2)
                    .background(priorityColor.opacity(0.2))
                    .foregroundColor(priorityColor)
                    .cornerRadius(4)
            }
            
            Text(instruction.text)
                .font(.body)
            
            Text(instruction.reason)
                .font(.caption)
                .foregroundColor(.secondary)
        }
        .padding()
        .background(Color(.systemBackground))
        .cornerRadius(12)
        .shadow(radius: 4)
        .padding(.horizontal)
    }
    
    var priorityColor: Color {
        switch instruction.priority {
        case "high": return .red
        case "medium": return .orange
        case "low": return .green
        default: return .gray
        }
    }
}

// MARK: - Control Panel

struct ControlPanelView: View {
    @ObservedObject var captureManager: CaptureManager
    @Binding var selectedMode: CaptureSession.CaptureMode
    
    var body: some View {
        VStack(spacing: 16) {
            // Lägesväljare
            Picker("Mode", selection: $selectedMode) {
                Text("Recording").tag(CaptureSession.CaptureMode.recording)
                Text("Guided").tag(CaptureSession.CaptureMode.guided)
                Text("Mission").tag(CaptureSession.CaptureMode.mission)
                Text("Adaptive").tag(CaptureSession.CaptureMode.adaptive)
            }
            .pickerStyle(SegmentedPickerStyle())
            .padding(.horizontal)
            .disabled(captureManager.isRecording)
            
            // Inspelningsknapp
            Button(action: {
                if captureManager.isRecording {
                    captureManager.stopSession()
                } else {
                    let config = SessionConfig(
                        videoQuality: .p1080,
                        telemetryRate: 10,
                        uploadMode: .buffered,
                        missionType: selectedMode == .mission ? "crosswalks" : nil,
                        area: nil
                    )
                    captureManager.startSession(mode: selectedMode, config: config)
                }
            }) {
                ZStack {
                    Circle()
                        .fill(captureManager.isRecording ? Color.red : Color.green)
                        .frame(width: 72, height: 72)
                    
                    if captureManager.isRecording {
                        RoundedRectangle(cornerRadius: 4)
                            .fill(Color.white)
                            .frame(width: 24, height: 24)
                    } else {
                        Circle()
                            .fill(Color.white)
                            .frame(width: 60, height: 60)
                    }
                }
            }
            
            // Status-text
            if let session = captureManager.currentSession {
                Text("Mission: \(session.missionId)")
                    .font(.caption)
                    .foregroundColor(.secondary)
            }
        }
        .padding(.vertical)
        .background(Color(.systemBackground))
    }
}

// MARK: - Settings View

struct SettingsView: View {
    @Environment(\.presentationMode) var presentationMode
    
    var body: some View {
        NavigationView {
            List {
                Section(header: Text("Video")) {
                    Picker("Quality", selection: .constant(1)) {
                        Text("720p").tag(0)
                        Text("1080p").tag(1)
                        Text("4K").tag(2)
                    }
                    
                    Toggle("Stabilization", isOn: .constant(true))
                }
                
                Section(header: Text("Telemetry")) {
                    Picker("Rate", selection: .constant(10)) {
                        Text("5 Hz").tag(5)
                        Text("10 Hz").tag(10)
                        Text("20 Hz").tag(20)
                    }
                    
                    Toggle("IMU", isOn: .constant(true))
                    Toggle("Compass", isOn: .constant(true))
                    Toggle("Altimeter", isOn: .constant(true))
                }
                
                Section(header: Text("Upload")) {
                    Picker("Mode", selection: .constant(1)) {
                        Text("Realtime").tag(0)
                        Text("Buffered").tag(1)
                        Text("Manual").tag(2)
                    }
                    
                    Toggle("WiFi Only", isOn: .constant(true))
                }
            }
            .navigationTitle("Settings")
            .navigationBarTitleDisplayMode(.inline)
            .toolbar {
                ToolbarItem(placement: .navigationBarTrailing) {
                    Button("Done") {
                        presentationMode.wrappedValue.dismiss()
                    }
                }
            }
        }
    }
}

// MARK: - Preview

struct ContentView_Previews: PreviewProvider {
    static var previews: some View {
        ContentView()
    }
}