import SwiftUI

struct ContentView: View {
    @EnvironmentObject var sdk: SDKManager
    @State private var userId = "test-user-001"
    @State private var fileKey = ""

    var body: some View {
        NavigationView {
            List {
                statusSection
                scanSection
                deviceSection
                fileSection
                logSection
            }
            .navigationTitle("BLE SDK Test")
        }
    }

    // MARK: - Status

    private var statusSection: some View {
        Section("Status") {
            HStack {
                Text("Connection")
                Spacer()
                Text(sdk.btState)
                    .foregroundStyle(sdk.btState == "connected" ? .green : .secondary)
                    .fontWeight(.medium)
            }

            if let error = sdk.error {
                HStack {
                    Image(systemName: "exclamationmark.triangle.fill")
                        .foregroundStyle(.red)
                    Text(error)
                        .foregroundStyle(.red)
                        .font(.caption)
                }
            }

            HStack {
                Text("SDK Ready")
                Spacer()
                Image(systemName: sdk.isSDKReady ? "checkmark.circle.fill" : "xmark.circle")
                    .foregroundStyle(sdk.isSDKReady ? .green : .red)
            }
        }
    }

    // MARK: - Scan

    private var scanSection: some View {
        Section("Scan") {
            HStack {
                Button("Scan") { sdk.scan() }
                    .buttonStyle(.borderedProminent)
                    .disabled(sdk.btState == "scanning")

                Button("Stop") { sdk.stopScan() }
                    .buttonStyle(.bordered)
                    .disabled(sdk.btState != "scanning")
            }

            if sdk.discoveredDevices.isEmpty && sdk.btState == "scanning" {
                HStack {
                    ProgressView()
                    Text("Searching...")
                        .foregroundStyle(.secondary)
                }
            }

            ForEach(sdk.discoveredDevices) { device in
                Button {
                    sdk.stopScan()
                    sdk.connect(deviceId: device.id)
                } label: {
                    HStack {
                        VStack(alignment: .leading) {
                            Text(device.name)
                                .font(.body)
                            Text(device.id)
                                .font(.caption2)
                                .foregroundStyle(.secondary)
                        }
                        Spacer()
                        Text("\(device.rssi) dBm")
                            .font(.caption)
                            .foregroundStyle(.secondary)
                    }
                }
            }
        }
    }

    // MARK: - Device

    private var deviceSection: some View {
        Section("Device") {
            if sdk.btState == "connected" {
                if let device = sdk.connectedDevice {
                    LabeledContent("Name", value: device["name"] as? String ?? "—")
                    LabeledContent("ID", value: device["id"] as? String ?? "—")
                }

                LabeledContent("Version", value: sdk.version.isEmpty ? "—" : sdk.version)

                if let info = sdk.deviceInfo {
                    LabeledContent("Brand", value: info.brand)
                    LabeledContent("Screen", value: info.screenSize)
                    LabeledContent("Battery", value: "\(info.batteryLevel)%")
                    LabeledContent("Storage", value: formatStorage(free: info.freeSpace, total: info.totalSpace))
                }

                HStack(spacing: 12) {
                    Button("Get Info") { sdk.getDeviceInfo() }
                        .buttonStyle(.bordered)
                    Button("Get Version") { sdk.getVersion() }
                        .buttonStyle(.bordered)
                }

                HStack {
                    TextField("User ID", text: $userId)
                        .textFieldStyle(.roundedBorder)
                    Button("Bind") { sdk.bind(userId: userId) }
                        .buttonStyle(.bordered)
                }

                HStack(spacing: 12) {
                    Button("Unbind") { sdk.unbind(userId: userId) }
                        .buttonStyle(.bordered)
                    Button("Disconnect") { sdk.disconnect() }
                        .buttonStyle(.bordered)
                        .tint(.red)
                }
            } else if sdk.btState == "connecting" {
                HStack {
                    ProgressView()
                    Text("Connecting...")
                }
            } else {
                Text("No device connected")
                    .foregroundStyle(.secondary)
            }
        }
    }

    // MARK: - File

    private var fileSection: some View {
        Section("File Transfer") {
            if sdk.btState == "connected" {
                if sdk.transferProgress > 0 {
                    VStack(alignment: .leading) {
                        Text("Transfer: \(sdk.transferProgress)%")
                            .font(.caption)
                        ProgressView(value: Double(sdk.transferProgress), total: 100)
                    }
                }

                HStack {
                    TextField("File key to delete", text: $fileKey)
                        .textFieldStyle(.roundedBorder)
                    Button("Delete") { sdk.deleteFile(key: fileKey) }
                        .buttonStyle(.bordered)
                        .tint(.red)
                        .disabled(fileKey.isEmpty)
                }
            } else {
                Text("Connect a device first")
                    .foregroundStyle(.secondary)
            }
        }
    }

    // MARK: - Log

    private var logSection: some View {
        Section("Event Log (\(sdk.logs.count))") {
            ForEach(sdk.logs.prefix(50)) { entry in
                VStack(alignment: .leading, spacing: 2) {
                    Text(entry.message)
                        .font(.caption)
                    Text(entry.time, style: .time)
                        .font(.caption2)
                        .foregroundStyle(.tertiary)
                }
            }

            if sdk.logs.isEmpty {
                Text("No events yet")
                    .foregroundStyle(.secondary)
            }
        }
    }

    // MARK: - Helpers

    private func formatStorage(free: Int, total: Int) -> String {
        let freeMB = free / 1_048_576
        let totalMB = total / 1_048_576
        return "\(freeMB)MB / \(totalMB)MB"
    }
}