import SwiftUI
import AppKit

// NSImage wrapper that actually renders properly in SwiftUI
struct AppIconView: NSViewRepresentable {
    let nsImage: NSImage

    func makeNSView(context: Context) -> NSImageView {
        let view = NSImageView()
        view.imageScaling = .scaleProportionallyUpOrDown
        view.image = nsImage
        return view
    }

    func updateNSView(_ nsView: NSImageView, context: Context) {
        nsView.image = nsImage
    }
}

struct PreferencesView: View {
    @State private var selectedBundleID: String
    @State private var customAppName: String?
    @State private var customAppIcon: NSImage?
    @State private var startAtLogin: Bool
    let onSave: (String) -> Void
    let onStartAtLoginChanged: (Bool) -> Void

    init(
        currentBundleID: String,
        startAtLogin: Bool,
        onSave: @escaping (String) -> Void,
        onStartAtLoginChanged: @escaping (Bool) -> Void
    ) {
        _selectedBundleID = State(initialValue: currentBundleID)
        _startAtLogin = State(initialValue: startAtLogin)
        self.onSave = onSave
        self.onStartAtLoginChanged = onStartAtLoginChanged

        if !MediaPlayer.known.contains(where: { $0.bundleID == currentBundleID }) {
            if let url = NSWorkspace.shared.urlForApplication(withBundleIdentifier: currentBundleID) {
                _customAppName = State(initialValue: url.deletingPathExtension().lastPathComponent)
                _customAppIcon = State(initialValue: NSWorkspace.shared.icon(forFile: url.path))
            }
        }
    }

    var body: some View {
        VStack(spacing: 0) {
            Text("HUDini Preferences")
                .font(.headline)
                .padding(.top, 16)
                .padding(.bottom, 12)

            Divider()

            VStack(alignment: .leading, spacing: 8) {
                Text("Launch on Play key:")
                    .font(.subheadline)
                    .foregroundColor(.secondary)

                VStack(spacing: 0) {
                    ForEach(Array(MediaPlayer.known.enumerated()), id: \.element.bundleID) { index, player in
                        PlayerRow(
                            player: player,
                            isSelected: selectedBundleID == player.bundleID,
                            isInstalled: NSWorkspace.shared.urlForApplication(
                                withBundleIdentifier: player.bundleID) != nil
                        ) {
                            selectedBundleID = player.bundleID
                            customAppName = nil
                            customAppIcon = nil
                            onSave(player.bundleID)
                        }
                        if index < MediaPlayer.known.count - 1 {
                            Divider().padding(.leading, 46)
                        }
                    }

                    if let name = customAppName {
                        Divider().padding(.leading, 46)
                        CustomPlayerRow(
                            name: name,
                            icon: customAppIcon,
                            isSelected: !MediaPlayer.known.contains(where: { $0.bundleID == selectedBundleID })
                        ) {
                            onSave(selectedBundleID)
                        }
                    }
                }
                .background(Color(nsColor: .controlBackgroundColor))
                .cornerRadius(8)
                .overlay(
                    RoundedRectangle(cornerRadius: 8)
                        .stroke(Color(nsColor: .separatorColor), lineWidth: 0.5)
                )

                Button("Choose Other App...") {
                    chooseCustomApp()
                }
                .padding(.top, 4)
            }
            .padding(16)

            Divider()

            HStack {
                Toggle("Start at login", isOn: Binding(
                    get: { startAtLogin },
                    set: { newValue in
                        startAtLogin = newValue
                        onStartAtLoginChanged(newValue)
                    }
                ))
                Spacer()
            }
            .padding(.horizontal, 16)
            .padding(.vertical, 12)

            Spacer()
        }
        .frame(width: 320, height: 440)
    }

    private func chooseCustomApp() {
        let panel = NSOpenPanel()
        panel.title = "Choose Application"
        panel.allowedContentTypes = [.application]
        panel.directoryURL = URL(fileURLWithPath: "/Applications")
        panel.canChooseDirectories = false
        panel.canChooseFiles = true
        panel.allowsMultipleSelection = false

        guard panel.runModal() == .OK, let url = panel.url,
              let bundle = Bundle(url: url), let bid = bundle.bundleIdentifier else { return }

        selectedBundleID = bid
        customAppName = url.deletingPathExtension().lastPathComponent
        customAppIcon = NSWorkspace.shared.icon(forFile: url.path)
        onSave(bid)
    }
}

struct PlayerRow: View {
    let player: MediaPlayer
    let isSelected: Bool
    let isInstalled: Bool
    let onSelect: () -> Void

    var body: some View {
        Button(action: onSelect) {
            HStack(spacing: 10) {
                iconView
                    .frame(width: 30, height: 30)

                Text(player.name)
                    .foregroundColor(isInstalled ? .primary : .secondary)

                Spacer()

                if !isInstalled {
                    Text("not installed")
                        .font(.caption)
                        .foregroundColor(.secondary)
                }

                if isSelected {
                    Image(systemName: "checkmark")
                        .foregroundColor(.accentColor)
                        .fontWeight(.semibold)
                }
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 5)
            .contentShape(Rectangle())
        }
        .buttonStyle(.plain)
        .background(isSelected ? Color.accentColor.opacity(0.1) : Color.clear)
    }

    @ViewBuilder
    private var iconView: some View {
        if let url = NSWorkspace.shared.urlForApplication(withBundleIdentifier: player.bundleID) {
            AppIconView(nsImage: NSWorkspace.shared.icon(forFile: url.path))
        } else {
            Image(systemName: "music.note.house")
                .font(.system(size: 20))
                .foregroundColor(.secondary)
                .frame(width: 30, height: 30)
        }
    }
}

struct CustomPlayerRow: View {
    let name: String
    let icon: NSImage?
    let isSelected: Bool
    let onSelect: () -> Void

    var body: some View {
        Button(action: onSelect) {
            HStack(spacing: 10) {
                if let icon = icon {
                    AppIconView(nsImage: icon)
                        .frame(width: 30, height: 30)
                } else {
                    Image(systemName: "app.fill")
                        .font(.system(size: 20))
                        .foregroundColor(.secondary)
                        .frame(width: 30, height: 30)
                }

                Text(name)
                Spacer()

                if isSelected {
                    Image(systemName: "checkmark")
                        .foregroundColor(.accentColor)
                        .fontWeight(.semibold)
                }
            }
            .padding(.horizontal, 12)
            .padding(.vertical, 5)
            .contentShape(Rectangle())
        }
        .buttonStyle(.plain)
        .background(isSelected ? Color.accentColor.opacity(0.1) : Color.clear)
    }
}