import SwiftUI

struct SettingsView: View {
    @StateObject private var model: SettingsViewModel
    @State private var showsClearDialog = false

    init(model: SettingsViewModel? = nil) {
        _model = StateObject(wrappedValue: model ?? DefaultContainer.makeSettingsModel())
    }

    var body: some View {
        ZStack {
            AITheme.canvas.ignoresSafeArea()
            ScrollView {
                LazyVStack(spacing: 12) {
                    if let errorMessage = model.errorMessage {
                        AIStatusBanner(errorMessage, tint: AITheme.danger, systemImage: "exclamationmark.triangle")
                    }
                    if let notice = model.notice {
                        AIStatusBanner(notice, tint: AITheme.success, systemImage: "checkmark.circle")
                    }

                    runtimeCard
                    storageCard
                    securityCard
                }
                .padding(16)
            }
        }
        .navigationTitle("设置")
        .toolbar {
            ToolbarItemGroup(placement: .primaryAction) {
                AIToolbarButton("刷新", systemImage: "arrow.clockwise") {
                    Task { await model.refresh() }
                }
                .disabled(model.isLoading)
            }
        }
        .refreshable {
            await model.refresh()
        }
        .confirmationDialog(
            "确认清除运行日志？此操作不可恢复。",
            isPresented: $showsClearDialog,
            titleVisibility: .visible
        ) {
            Button("清除运行日志", role: .destructive) {
                Task { await model.clearRuntimeLogs() }
            }
            Button("取消", role: .cancel) {}
        }
        .task {
            await model.refresh()
        }
    }

    private var runtimeCard: some View {
        AICard {
            VStack(alignment: .leading, spacing: 12) {
                AISectionTitle("应用信息", systemImage: "info.circle")
                if let runtime = model.runtime {
                    AIKeyValueRow("版本", value: "\(runtime.marketingVersion) (\(runtime.buildVersion))")
                    AIKeyValueRow("设备", value: runtime.deviceModel)
                } else {
                    Text("正在读取应用信息…")
                        .font(.subheadline)
                        .foregroundStyle(AITheme.muted)
                }
            }
        }
    }

    private var storageCard: some View {
        AICard {
            VStack(alignment: .leading, spacing: 12) {
                AISectionTitle("本地数据", systemImage: "externaldrive")
                AIKeyValueRow("存储位置", value: "仅保存在本机应用沙盒")
                AIKeyValueRow("当前占用", value: model.storageLabel)
                Button {
                    showsClearDialog = true
                } label: {
                    Label("清除运行日志", systemImage: "trash")
                }
                .buttonStyle(AIButtonStyle(kind: .danger, size: .large, fillsWidth: true))
            }
        }
    }

    private var securityCard: some View {
        AICard {
            VStack(alignment: .leading, spacing: 12) {
                AISectionTitle("安全与登录", systemImage: "lock.shield")
                AIKeyValueRow("实例密码", value: "保存在本机应用沙盒")
                AIKeyValueRow("登录会话", value: "仅保存在内存")
                AIStatusBanner(
                    "实例凭据只保存在本机应用沙盒，登录会话只保留在内存中，应用关闭后自动失效。",
                    tint: AITheme.primary,
                    systemImage: "shield.checkered"
                )
            }
        }
    }

}