import SwiftUI

struct InstanceDetailView: View {
    @StateObject private var model: DeviceViewModel
    @State private var revealsSensitive = false

    init(instance: Instance, model: DeviceViewModel? = nil) {
        _model = StateObject(wrappedValue: model ?? DefaultContainer.makeDeviceModel(instance: instance))
    }

    var body: some View {
        ZStack {
            AITheme.canvas.ignoresSafeArea()
            ScrollView {
                LazyVStack(spacing: 12) {
                    header
                    if let errorMessage = model.errorMessage {
                        AICard {
                            Text(errorMessage)
                                .font(.subheadline)
                                .foregroundStyle(AITheme.warning)
                        }
                    }
                    if let snapshot = model.snapshot {
                        ForEach(snapshot.sections) { section in
                            sectionCard(section)
                        }
                    }
                }
                .padding(16)
            }
        }
        .navigationTitle(model.instance.name)
        .toolbar {
            ToolbarItem(placement: .primaryAction) {
                Button {
                    revealsSensitive.toggle()
                } label: {
                    Label(revealsSensitive ? "隐藏敏感值" : "显示敏感值",
                          systemImage: revealsSensitive ? "eye.slash" : "eye")
                }
                .buttonStyle(AIButtonStyle(kind: .secondary, size: .compact))
            }
        }
        .refreshable {
            await model.refresh()
        }
        .task {
            await model.refresh()
        }
    }

    private var header: some View {
        AICard {
            VStack(alignment: .leading, spacing: 8) {
                Text("设备详情")
                    .font(.headline)
                Text(model.instance.origin.absoluteString)
                    .font(.subheadline)
                    .foregroundStyle(AITheme.muted)
                if model.isLoading {
                    Text("正在读取设备能力…")
                        .font(.subheadline)
                        .foregroundStyle(AITheme.muted)
                }
            }
        }
    }

    private func sectionCard(_ section: DeviceSection) -> some View {
        AICard {
            VStack(alignment: .leading, spacing: 12) {
                Text(section.title)
                    .font(.headline)
                if section.values.isEmpty {
                    Text("此模块当前不可用或未返回数据。")
                        .font(.subheadline)
                        .foregroundStyle(AITheme.muted)
                } else {
                    ForEach(section.values.sorted(by: { $0.key < $1.key }), id: \.key) { item in
                        HStack(alignment: .top, spacing: 10) {
                            Text(fieldLabel(item.key))
                                .font(.subheadline)
                                .foregroundStyle(AITheme.muted)
                                .frame(maxWidth: .infinity, alignment: .leading)
                            Text(display(item.key, item.value))
                                .font(.subheadline)
                                .foregroundStyle(AITheme.ink)
                                .multilineTextAlignment(.trailing)
                        }
                    }
                }
            }
        }
    }

    private let fieldLabels: [String: String] = [
        "model": "型号",
        "manufacturer": "制造商",
        "imei": "IMEI",
        "revision": "固件版本",
        "online": "在线",
        "powered": "基带电源",
        "present": "SIM 在位",
        "iccid": "ICCID",
        "imsi": "IMSI",
        "phone_numbers": "号码",
        "sms_center": "短信中心",
        "operator_name": "运营商",
        "registration_status": "注册状态",
        "technology_preference": "网络制式",
        "signal_strength": "信号强度",
        "core_count": "核心数",
        "model_name": "CPU 型号",
        "state": "连接状态",
        "latency_ms": "延迟（ms）"
    ]

    private let sensitiveKeys: Set<String> = ["imei", "iccid", "imsi", "phone_numbers", "sms_center"]

    private func fieldLabel(_ key: String) -> String {
        fieldLabels[key] ?? key.replacingOccurrences(of: "_", with: " ")
    }

    private func display(_ key: String, _ value: String) -> String {
        guard sensitiveKeys.contains(key), !revealsSensitive else { return value }
        guard let first = value.first, value.count > 6 else { return String(repeating: "•", count: min(value.count, 8)) }
        let tail = value.suffix(4)
        return "\(first) •••• \(tail)"
    }
}