multi-simadmin/apps/ios/Sources/MultiSimAdmin/Features/Fleet/FleetView.swift

import SwiftUI

struct FleetView: View {
    @StateObject private var model: FleetViewModel
    @State private var showsDeleteDialog = false

    init(model: FleetViewModel? = nil) {
        _model = StateObject(wrappedValue: model ?? DefaultContainer.makeFleetModel())
    }

    var body: some View {
        ZStack {
            AITheme.canvas.ignoresSafeArea()
            ScrollView {
                LazyVStack(spacing: 12) {
                    searchField
                    if model.selectionMode {
                        selectionBar
                    }
                    if model.rows.isEmpty && !model.isLoading {
                        AICard {
                            VStack(spacing: 10) {
                                Image(systemName: "server.rack")
                                    .font(.system(size: 28))
                                    .foregroundStyle(AITheme.muted)
                                Text("暂无实例")
                                    .font(.headline)
                                Text("添加 SimAdmin 实例后即可开始管理。")
                                    .font(.subheadline)
                                    .foregroundStyle(AITheme.muted)
                            }
                            .frame(maxWidth: .infinity)
                            .padding(.vertical, 18)
                        }
                    }
                    ForEach(model.rows) { row in
                        if model.selectionMode {
                            instanceCard(row)
                        } else {
                            NavigationLink {
                                InstanceDetailView(instance: row.instance)
                            } label: {
                                instanceCard(row)
                            }
                            .buttonStyle(.plain)
                        }
                    }
                }
                .padding(16)
            }
        }
        .navigationTitle("节点总览")
        .toolbar {
            ToolbarItemGroup(placement: .primaryAction) {
                Button {
                    model.selectionMode.toggle()
                    model.selectedIDs.removeAll()
                } label: {
                    Label(model.selectionMode ? "完成" : "批量选择", systemImage: model.selectionMode ? "xmark" : "checklist")
                }
                .buttonStyle(AIButtonStyle(kind: .secondary, size: .regular))

                Button {
                    model.showingForm = true
                } label: {
                    Label("添加实例", systemImage: "plus")
                }
                .buttonStyle(AIButtonStyle(kind: .primary, size: .regular))
            }
        }
        .confirmationDialog(
            "删除已选实例？登录信息也会一并清除。",
            isPresented: $showsDeleteDialog,
            titleVisibility: .visible
        ) {
            Button("删除 \(model.selectedIDs.count) 个实例", role: .destructive) {
                Task { await model.deleteSelected() }
            }
            Button("取消", role: .cancel) {}
        }
        .refreshable {
            await model.refresh()
        }
        .task {
            await model.refresh()
        }
        .sheet(isPresented: $model.showingForm) {
            InstanceFormView(model: model)
        }
    }

    private var searchField: some View {
        AISearchField("搜索实例或地址", text: $model.searchText) {
            Task { await model.refresh() }
        }
    }

    private var selectionBar: some View {
        AICard {
            HStack(spacing: 10) {
                Button {
                    if model.selectedIDs.count == model.rows.count {
                        model.selectedIDs.removeAll()
                    } else {
                        model.selectedIDs = Set(model.rows.map(\.id))
                    }
                } label: {
                    Label(
                        model.selectedIDs.count == model.rows.count ? "取消全选" : "全选",
                        systemImage: "checkmark.circle"
                    )
                }
                .buttonStyle(AIButtonStyle(kind: .secondary, size: .compact))

                Spacer()

                Text("已选 \(model.selectedIDs.count)")
                    .font(.subheadline.weight(.semibold))
                    .foregroundStyle(AITheme.muted)

                Button {
                    showsDeleteDialog = true
                } label: {
                    Label("删除", systemImage: "trash")
                }
                .buttonStyle(AIButtonStyle(kind: .danger, size: .compact))
                .disabled(model.selectedIDs.isEmpty)
            }
        }
    }

    private func instanceCard(_ row: FleetViewModel.Row) -> some View {
        AICard {
            HStack(alignment: .top, spacing: 12) {
                if model.selectionMode {
                    Button {
                        toggle(row.id)
                    } label: {
                        Image(systemName: model.selectedIDs.contains(row.id)
                            ? "checkmark.circle.fill" : "circle")
                            .font(.system(size: 20))
                            .foregroundStyle(model.selectedIDs.contains(row.id) ? AITheme.primary : AITheme.muted)
                    }
                    .buttonStyle(.plain)
                    .frame(width: 32, height: 32)
                }
                VStack(alignment: .leading, spacing: 8) {
                    HStack(spacing: 8) {
                        Text(row.instance.name)
                            .font(.headline)
                            .foregroundStyle(AITheme.ink)
                        Spacer()
                        AITag(row.status.label, tint: statusColor(row.status))
                    }
                    Text(row.instance.origin.absoluteString)
                        .font(.subheadline)
                        .foregroundStyle(AITheme.muted)
                    if !row.instance.tags.isEmpty {
                        HStack(spacing: 6) {
                            ForEach(row.instance.tags, id: \.self) { tag in
                                AITag(tag)
                            }
                        }
                    }
                }
            }
        }
    }

    private func statusColor(_ status: ConnectionStatus) -> Color {
        switch status {
        case .online: return AITheme.success
        case .offline: return AITheme.danger
        case .authRequired: return AITheme.warning
        case .degraded: return AITheme.warning
        case .unknown: return AITheme.muted
        }
    }

    private func toggle(_ id: UUID) {
        if model.selectedIDs.contains(id) {
            model.selectedIDs.remove(id)
        } else {
            model.selectedIDs.insert(id)
        }
    }
}