import AVFoundation
import Observation
import SceneKit
import SwiftUI
import UIKit

@Observable
final class InventoryStore {
    enum Mode: String, CaseIterable, Identifiable {
        case sunseeker = "Sunseeker"
        case dreamWeaver = "Dream Weaver"
        case dollhouse = "Dollhouse"

        var id: String { rawValue }
    }

    var mode: Mode = .sunseeker
    var selectedPrompt: String = "Modern Islamic"
    var sourceImage: UIImage?
    var generatedImage: UIImage?
    var isProcessing: Bool = false
    var sunNodesReady: Bool = false
    var dollhouseHour: Double = 12

    let prompts = ["Modern Islamic", "Minimalist", "Night Mode"]
}

struct InventoryView: View {
    @State private var store = InventoryStore()
    @State private var showCamera = false
    @State private var sliderTickHour = 12
    private let haptics = UIImpactFeedbackGenerator(style: .light)

    var body: some View {
        VStack(alignment: .leading, spacing: 16) {
            // Page header
            VStack(alignment: .leading, spacing: 4) {
                Text("Inventory")
                    .font(.system(size: 28, weight: .bold))
                    .foregroundStyle(VelocityTheme.foreground)
                Text("Sunseeker · Dream Weaver · Dollhouse")
                    .font(.system(size: 12))
                    .foregroundStyle(VelocityTheme.mutedFg)
            }
            .padding(.horizontal, 20)
            .padding(.top, 20)

            Picker("Mode", selection: $store.mode) {
                ForEach(InventoryStore.Mode.allCases) { mode in
                    Text(mode.rawValue).tag(mode)
                }
            }
            .pickerStyle(.segmented)
            .padding(.horizontal, 20)
            .padding(.top, 12)

            Group {
                switch store.mode {
                case .sunseeker:
                    #if targetEnvironment(simulator)
                    ZStack {
                        VStack(spacing: 14) {
                            Image(systemName: "camera.metering.unknown")
                                .font(.system(size: 40))
                                .foregroundStyle(VelocityTheme.mutedFg)
                            Text("AR Not Available in Simulator")
                                .font(.system(size: 16, weight: .semibold))
                                .foregroundStyle(VelocityTheme.foreground)
                            Text("Sunseeker requires a real device with a camera and compass. Run on iPhone or iPad to use this feature.")
                                .font(.system(size: 13))
                                .foregroundStyle(VelocityTheme.mutedFg)
                                .multilineTextAlignment(.center)
                        }
                        .padding(24)
                        .frame(maxWidth: .infinity, maxHeight: .infinity)
                    }
                    .background(
                        RoundedRectangle(cornerRadius: 16)
                            .fill(Color(red: 0.031, green: 0.039, blue: 0.071))
                            .overlay(
                                RoundedRectangle(cornerRadius: 16)
                                    .stroke(VelocityTheme.borderAccent, lineWidth: 1)
                            )
                    )
                    #else
                    SunseekerPanel(sunNodesReady: $store.sunNodesReady)
                    #endif
                case .dreamWeaver:
                    DreamWeaverPanel(
                        sourceImage: $store.sourceImage,
                        generatedImage: $store.generatedImage,
                        selectedPrompt: $store.selectedPrompt,
                        isProcessing: $store.isProcessing,
                        prompts: store.prompts,
                        showCamera: $showCamera
                    )
                case .dollhouse:
                    DollhousePanel(hour: $store.dollhouseHour, tickHour: $sliderTickHour, haptics: haptics)
                }
            }
            .padding(.horizontal, 20)
            .padding(.bottom, 20)
            .animation(.easeInOut(duration: 0.25), value: store.mode)
        }
        .background(VelocityTheme.background)
        .onAppear {
            // Dark-theme the segmented control
            UISegmentedControl.appearance().selectedSegmentTintColor = UIColor(
                red: 0.231, green: 0.510, blue: 0.965, alpha: 0.85)
            UISegmentedControl.appearance().setTitleTextAttributes(
                [.foregroundColor: UIColor.white], for: .selected)
            UISegmentedControl.appearance().setTitleTextAttributes(
                [.foregroundColor: UIColor(white: 0.62, alpha: 1)], for: .normal)
            UISegmentedControl.appearance().backgroundColor = UIColor(
                red: 0.031, green: 0.039, blue: 0.071, alpha: 1)
        }
        .sheet(isPresented: $showCamera) {
            CameraPicker(image: $store.sourceImage, isPresented: $showCamera)
        }
    }
}

private struct SunseekerPanel: View {
    @Binding var sunNodesReady: Bool

    var body: some View {
        ZStack(alignment: .topLeading) {
            ARSunOverlayView(sunNodesReady: $sunNodesReady)
                .clipShape(RoundedRectangle(cornerRadius: 20))

            DashedSunLine()
                .stroke(Color.yellow.opacity(0.9), style: StrokeStyle(lineWidth: 3, dash: [10, 8]))
                .padding(.horizontal, 24)
                .padding(.vertical, 80)

            VStack(alignment: .leading, spacing: 8) {
                Text("Sunseeker")
                    .font(.headline)
                Text("Point the iPad toward windows to inspect yearly sun-entry path.")
                    .font(.subheadline)
                    .foregroundStyle(.secondary)
            }
            .padding(14)
            .background {
                GlassBlurView(style: .systemThinMaterial)
                    .clipShape(RoundedRectangle(cornerRadius: 14))
            }
            .padding(20)
        }
    }
}

private struct DreamWeaverPanel: View {
    @Binding var sourceImage: UIImage?
    @Binding var generatedImage: UIImage?
    @Binding var selectedPrompt: String
    @Binding var isProcessing: Bool
    let prompts: [String]
    @Binding var showCamera: Bool

    var body: some View {
        VStack(spacing: 14) {
            ZStack {
                RoundedRectangle(cornerRadius: 20)
                    .fill(Color.black.opacity(0.9))

                if let sourceImage {
                    Image(uiImage: sourceImage)
                        .resizable()
                        .scaledToFit()
                        .clipShape(RoundedRectangle(cornerRadius: 16))
                        .padding(12)
                } else {
                    ContentUnavailableView("No Capture", systemImage: "camera.viewfinder", description: Text("Tap Capture to snap a room."))
                        .foregroundStyle(.white)
                }

                if let generatedImage {
                    Image(uiImage: generatedImage)
                        .resizable()
                        .scaledToFit()
                        .clipShape(RoundedRectangle(cornerRadius: 16))
                        .padding(12)
                        .transition(.opacity)
                }

                if isProcessing {
                    ProcessingOverlay()
                }
            }
            .frame(maxWidth: .infinity, minHeight: 420)
            .animation(.easeInOut(duration: 0.35), value: generatedImage)

            ScrollView(.horizontal, showsIndicators: false) {
                HStack(spacing: 10) {
                    ForEach(prompts, id: \.self) { prompt in
                        Text(prompt)
                            .font(.subheadline.weight(.semibold))
                            .padding(.horizontal, 14)
                            .padding(.vertical, 10)
                            .background(
                                RoundedRectangle(cornerRadius: 12)
                                    .fill(prompt == selectedPrompt ? Color.yellow.opacity(0.85) : Color.white.opacity(0.12))
                            )
                            .onTapGesture { selectedPrompt = prompt }
                    }
                }
            }

            HStack(spacing: 12) {
                Button("Capture") {
                    showCamera = true
                }
                .buttonStyle(.borderedProminent)

                Button("Reimagine") {
                    Task { await generate() }
                }
                .buttonStyle(.bordered)
                .disabled(sourceImage == nil || isProcessing)
            }
        }
        .padding(16)
        .background {
            GlassBlurView(style: .systemThinMaterial)
                .clipShape(RoundedRectangle(cornerRadius: 18))
        }
    }

    @MainActor
    private func generate() async {
        guard let sourceImage, !isProcessing else { return }
        isProcessing = true
        do {
            let result = try await ComfyClient.shared.generateImage(source: sourceImage, prompt: selectedPrompt)
            withAnimation(.easeInOut(duration: 0.4)) {
                generatedImage = result
            }
        } catch {
            print("Dream Weaver error: \(error)")
        }
        isProcessing = false
    }
}

private struct DollhousePanel: View {
    @Binding var hour: Double
    @Binding var tickHour: Int
    let haptics: UIImpactFeedbackGenerator

    var body: some View {
        VStack(spacing: 12) {
            SceneKitDollhouseView(hour: $hour)
                .clipShape(RoundedRectangle(cornerRadius: 20))
                .frame(maxWidth: .infinity, minHeight: 460)

            VStack(alignment: .leading, spacing: 8) {
                Text(String(format: "Time: %02d:00", Int(hour.rounded())))
                    .font(.headline)
                Slider(value: $hour, in: 0...24, step: 0.25)
                    .onChange(of: hour) { _, newValue in
                        let rounded = Int(newValue.rounded())
                        if rounded != tickHour {
                            tickHour = rounded
                            haptics.impactOccurred(intensity: 0.7)
                        }
                    }
            }
            .padding(14)
            .background {
                GlassBlurView(style: .systemThinMaterial)
                    .clipShape(RoundedRectangle(cornerRadius: 14))
            }
        }
    }
}

private struct SceneKitDollhouseView: UIViewRepresentable {
    @Binding var hour: Double

    func makeCoordinator() -> Coordinator {
        Coordinator()
    }

    func makeUIView(context: Context) -> SCNView {
        let view = SCNView()
        view.scene = context.coordinator.scene
        view.autoenablesDefaultLighting = false
        view.allowsCameraControl = true
        view.backgroundColor = UIColor.systemBackground
        context.coordinator.setupScene()
        context.coordinator.updateSunLight(hour: hour)
        return view
    }

    func updateUIView(_ uiView: SCNView, context: Context) {
        context.coordinator.updateSunLight(hour: hour)
    }

    final class Coordinator {
        let scene = SCNScene()
        private let sunNode = SCNNode()

        func setupScene() {
            if let modelScene = SCNScene(named: "Building.usdz") ?? SCNScene(named: "Building.scn") {
                let container = SCNNode()
                for child in modelScene.rootNode.childNodes {
                    container.addChildNode(child.clone())
                }
                scene.rootNode.addChildNode(container)
            } else {
                let fallback = SCNFloor()
                fallback.firstMaterial?.diffuse.contents = UIColor.secondarySystemBackground
                scene.rootNode.addChildNode(SCNNode(geometry: fallback))
            }

            let camera = SCNCamera()
            let cameraNode = SCNNode()
            cameraNode.camera = camera
            cameraNode.position = SCNVector3(0, 4, 10)
            scene.rootNode.addChildNode(cameraNode)

            let light = SCNLight()
            light.type = .directional
            light.intensity = 1_200
            light.castsShadow = true
            sunNode.light = light
            scene.rootNode.addChildNode(sunNode)

            let ambient = SCNLight()
            ambient.type = .ambient
            ambient.intensity = 200
            let ambientNode = SCNNode()
            ambientNode.light = ambient
            scene.rootNode.addChildNode(ambientNode)
        }

        func updateSunLight(hour: Double) {
            let normalized = (hour / 24.0) * (2 * Double.pi)
            let x = Float(cos(normalized) * 8.0)
            let y = Float(max(sin(normalized) * 8.0, 1.0))
            let z = Float(sin(normalized + .pi / 3) * 6.0)
            sunNode.position = SCNVector3(x, y, z)
            sunNode.look(at: SCNVector3(0, 0, 0))
        }
    }
}

private struct ProcessingOverlay: View {
    @State private var animate = false

    var body: some View {
        ZStack {
            RoundedRectangle(cornerRadius: 16)
                .fill(.black.opacity(0.45))

            Text("AI Processing...")
                .font(.headline.weight(.bold))
                .foregroundStyle(.white)
                .padding(.horizontal, 20)
                .padding(.vertical, 12)
                .background {
                    GlassBlurView(style: .systemUltraThinMaterialDark)
                        .clipShape(Capsule())
                }
                .overlay(
                    Rectangle()
                        .fill(
                            LinearGradient(
                                colors: [.clear, .white.opacity(0.6), .clear],
                                startPoint: .leading,
                                endPoint: .trailing
                            )
                        )
                        .rotationEffect(.degrees(18))
                        .offset(x: animate ? 160 : -160)
                        .animation(.linear(duration: 1.2).repeatForever(autoreverses: false), value: animate)
                        .blendMode(.screen)
                        .mask(Capsule().frame(height: 44))
                )
        }
        .padding(12)
        .onAppear { animate = true }
    }
}

private struct DashedSunLine: Shape {
    func path(in rect: CGRect) -> Path {
        var path = Path()
        path.move(to: CGPoint(x: rect.minX, y: rect.maxY * 0.75))
        path.addQuadCurve(
            to: CGPoint(x: rect.maxX, y: rect.maxY * 0.25),
            control: CGPoint(x: rect.midX, y: rect.minY + 30)
        )
        return path
    }
}

private struct CameraPicker: UIViewControllerRepresentable {
    @Binding var image: UIImage?
    @Binding var isPresented: Bool

    func makeCoordinator() -> Coordinator {
        Coordinator(self)
    }

    func makeUIViewController(context: Context) -> UIImagePickerController {
        let picker = UIImagePickerController()
        picker.delegate = context.coordinator
        if UIImagePickerController.isSourceTypeAvailable(.camera) {
            picker.sourceType = .camera
            picker.cameraCaptureMode = .photo
        } else {
            picker.sourceType = .photoLibrary
        }
        return picker
    }

    func updateUIViewController(_ uiViewController: UIImagePickerController, context: Context) {}

    final class Coordinator: NSObject, UINavigationControllerDelegate, UIImagePickerControllerDelegate {
        private let parent: CameraPicker

        init(_ parent: CameraPicker) {
            self.parent = parent
        }

        func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
            parent.isPresented = false
        }

        func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey: Any]) {
            if let captured = info[.originalImage] as? UIImage {
                parent.image = captured
            }
            parent.isPresented = false
        }
    }
}