import SwiftUI
import SwiftData

struct MeView: View {
    @Environment(\.modelContext) private var ctx
    @Query private var profiles: [UserProfile]
    @Query private var reminders: [MetricReminder]
    @Query private var customMetrics: [CustomMonitorMetric]

    @State private var downloadService = ModelDownloadService.shared

    private var profile: UserProfile? { profiles.first }
    private var enabledReminderCount: Int { reminders.filter(\.enabled).count }

    var body: some View {
        NavigationStack {
            ScrollView {
                VStack(spacing: 12) {
                    profileCard
                    remindersCard
                    customMetricsCard
                    modelManagementCard
                    settingsCard(title: "Face ID 启动锁",
                                 detail: "关闭",
                                 icon: "faceid")
                    settingsCard(title: "关于",
                                 detail: "v0.1 · W2",
                                 icon: "info.circle")

                    #if DEBUG
                    DebugAIRunner()
                        .padding(.top, 8)
                    #endif
                }
                .padding(.horizontal, 16)
                .padding(.vertical, 20)
            }
            .background(Tj.Palette.sand.ignoresSafeArea())
            .navigationTitle("我的")
            .navigationBarTitleDisplayMode(.large)
            .onAppear {
                if profiles.isEmpty {
                    _ = UserProfileStore.loadOrCreate(in: ctx)
                }
                downloadService.refreshStates()
            }
        }
    }

    // MARK: - Cards

    private var profileCard: some View {
        NavigationLink {
            ProfileEditView()
        } label: {
            HStack(spacing: 12) {
                ZStack {
                    Circle()
                        .fill(Tj.Palette.amber.opacity(0.25))
                    Image(systemName: "person.crop.circle.fill")
                        .font(.system(size: 22))
                        .foregroundStyle(Tj.Palette.ink)
                }
                .frame(width: 44, height: 44)

                VStack(alignment: .leading, spacing: 2) {
                    Text("个人资料")
                        .font(.system(size: 15, weight: .semibold))
                        .foregroundStyle(Tj.Palette.text)
                    Text(profileLine)
                        .font(.system(size: 12))
                        .foregroundStyle(Tj.Palette.text3)
                        .lineLimit(1)
                }
                Spacer()
                Image(systemName: "chevron.right")
                    .font(.system(size: 13, weight: .medium))
                    .foregroundStyle(Tj.Palette.text3)
            }
            .padding(14)
            .tjCard()
        }
        .buttonStyle(.plain)
    }

    private var remindersCard: some View {
        NavigationLink {
            RemindersListView()
        } label: {
            HStack(spacing: 12) {
                ZStack {
                    Circle()
                        .fill(enabledReminderCount > 0 ? Tj.Palette.amber.opacity(0.25) : Tj.Palette.sand2)
                    Image(systemName: "bell.fill")
                        .font(.system(size: 18))
                        .foregroundStyle(enabledReminderCount > 0 ? Tj.Palette.ink : Tj.Palette.text2)
                }
                .frame(width: 44, height: 44)

                VStack(alignment: .leading, spacing: 2) {
                    Text("记录提醒")
                        .font(.system(size: 15, weight: .semibold))
                        .foregroundStyle(Tj.Palette.text)
                    Text(reminderLine)
                        .font(.system(size: 12))
                        .foregroundStyle(Tj.Palette.text3)
                        .lineLimit(1)
                }
                Spacer()
                Image(systemName: "chevron.right")
                    .font(.system(size: 13, weight: .medium))
                    .foregroundStyle(Tj.Palette.text3)
            }
            .padding(14)
            .tjCard()
        }
        .buttonStyle(.plain)
    }

    private var reminderLine: String {
        if reminders.isEmpty { return "尚未设置" }
        if enabledReminderCount == 0 { return "全部已关闭(\(reminders.count) 条)" }
        return "\(enabledReminderCount) 项启用"
    }

    private var customMetricsCard: some View {
        NavigationLink {
            CustomMetricsListView()
        } label: {
            HStack(spacing: 12) {
                ZStack {
                    Circle()
                        .fill(customMetrics.isEmpty ? Tj.Palette.sand2 : Tj.Palette.leafSoft)
                    Image(systemName: "slider.horizontal.3")
                        .font(.system(size: 18))
                        .foregroundStyle(customMetrics.isEmpty ? Tj.Palette.text2 : Tj.Palette.ink)
                }
                .frame(width: 44, height: 44)

                VStack(alignment: .leading, spacing: 2) {
                    Text("自定义指标")
                        .font(.system(size: 15, weight: .semibold))
                        .foregroundStyle(Tj.Palette.text)
                    Text(customMetricsLine)
                        .font(.system(size: 12))
                        .foregroundStyle(Tj.Palette.text3)
                        .lineLimit(1)
                }
                Spacer()
                Image(systemName: "chevron.right")
                    .font(.system(size: 13, weight: .medium))
                    .foregroundStyle(Tj.Palette.text3)
            }
            .padding(14)
            .tjCard()
        }
        .buttonStyle(.plain)
    }

    private var customMetricsLine: String {
        if customMetrics.isEmpty { return "添加你自己的长期监测项" }
        return "\(customMetrics.count) 项"
    }

    private var modelManagementCard: some View {
        NavigationLink {
            ModelManagementView()
        } label: {
            settingsCard(title: "模型管理", detail: modelDetail, icon: "cpu")
        }
        .buttonStyle(.plain)
    }

    private var modelDetail: String {
        let states = downloadService.states
        if ModelKind.allCases.allSatisfy({ states[$0]?.phase == .ready }) { return "已就绪" }
        if downloadService.isAnyDownloading { return "下载中…" }
        let readyCount = ModelKind.allCases.filter { states[$0]?.phase == .ready }.count
        return readyCount == 0 ? "未下载" : "\(readyCount)/\(ModelKind.allCases.count) 就绪"
    }

    private func settingsCard(title: String, detail: String, icon: String) -> some View {
        HStack(spacing: 12) {
            ZStack {
                Circle().fill(Tj.Palette.sand2)
                Image(systemName: icon)
                    .font(.system(size: 18))
                    .foregroundStyle(Tj.Palette.text2)
            }
            .frame(width: 44, height: 44)

            Text(title)
                .font(.system(size: 15, weight: .medium))
                .foregroundStyle(Tj.Palette.text)
            Spacer()
            Text(detail)
                .font(.system(size: 12))
                .foregroundStyle(Tj.Palette.text3)
            Image(systemName: "chevron.right")
                .font(.system(size: 13, weight: .medium))
                .foregroundStyle(Tj.Palette.text3)
        }
        .padding(14)
        .tjCard()
    }

    private var profileLine: String {
        guard let p = profile, p.hasAnyBasics else {
            return "点这里完善你的资料"
        }
        return p.summaryLine
    }
}

#Preview {
    MeView()
        .modelContainer(for: [
            UserProfile.self, Indicator.self, Report.self, DiaryEntry.self,
            Asset.self, ChatTurn.self, Symptom.self, MetricReminder.self,
            CustomMonitorMetric.self,
        ], inMemory: true)
}