//
//  CooperationOrderListView.swift
//  suixinkan
//
//  Created by Codex on 2026/6/29.
//

import SwiftUI

/// 合作订单主页，展示获客线索与获客订单双 Tab 列表。
struct CooperationOrderListView: View {
    @EnvironmentObject private var toastCenter: ToastCenter
    @Environment(\.cooperationOrderAPI) private var cooperationOrderAPI
    @Environment(\.globalLoading) private var globalLoading
    @StateObject private var viewModel = CooperationOrderListViewModel()
    @State private var route: CooperationOrderRoute?
    /// 扫码绑定页在列表层弹出，避免在 navigationDestination 子页内嵌 fullScreenCover 触发 SwiftUI 栈溢出。
    @State private var showBindScanner = false

    var body: some View {
        VStack(spacing: 0) {
            CooperationOrderTabs(
                selectedTab: viewModel.selectedTab,
                onTabSelected: { viewModel.onTabSelected($0) }
            )

            if viewModel.selectedTab == 1 {
                CooperationOrderSearchBar(searchText: $viewModel.searchText) {
                    Task { await searchOrders(showLoading: true) }
                }
            }

            ScrollView {
                LazyVStack(spacing: 12) {
                    if viewModel.selectedTab == 0 {
                        if viewModel.hasLoadedLeadsOnce && viewModel.leads.isEmpty {
                            emptyState("暂无获客员线索")
                        } else {
                            ForEach(Array(viewModel.leads.enumerated()), id: \.element.id) { index, lead in
                                ReferralLeadCard(lead: lead)
                                    .onAppear {
                                        guard index >= viewModel.leads.count - 3 else { return }
                                        Task { await viewModel.loadMore(api: cooperationOrderAPI) }
                                    }
                            }
                        }
                    } else {
                        if viewModel.hasLoadedOrdersOnce && viewModel.orders.isEmpty {
                            emptyState("暂无相关合作订单")
                        } else {
                            ForEach(Array(viewModel.orders.enumerated()), id: \.element.id) { index, order in
                                AcquisitionOrderCard(order: order)
                                    .onAppear {
                                        guard index >= viewModel.orders.count - 3 else { return }
                                        Task { await viewModel.loadMore(api: cooperationOrderAPI) }
                                    }
                            }
                        }
                    }

                    if viewModel.isLoadingMore {
                        ProgressView()
                            .tint(CooperationOrderColors.primary)
                            .frame(width: 24, height: 24)
                            .padding(16)
                    }
                }
                .padding(.horizontal, 14)
                .padding(.vertical, 12)
            }
            .refreshable {
                await reloadCurrentTab(showLoading: false)
            }
        }
        .navigationTitle("合作订单")
        .navigationBarTitleDisplayMode(.inline)
        .toolbar {
            ToolbarItem(placement: .topBarTrailing) {
                Button("合作获客员") {
                    route = .acquirer
                }
                .font(.system(size: 14))
                .foregroundStyle(CooperationOrderColors.primary)
            }
        }
        .background(CooperationOrderColors.pageBg.ignoresSafeArea())
        .fullScreenCover(isPresented: $showBindScanner) {
            OrderScannerPage(
                onClose: { showBindScanner = false },
                onSuccess: { raw in
                    showBindScanner = false
                    guard let saleUserId = SaleUserQrParser.parseSaleUserId(raw), saleUserId > 0 else {
                        toastCenter.show("请扫描正确的获客员二维码")
                        return
                    }
                    route = .bind(saleUserId: saleUserId)
                },
                onFailure: { error in
                    showBindScanner = false
                    toastCenter.show(error.localizedDescription)
                }
            )
        }
        .appNavigationDestination(item: $route) { destination in
            switch destination {
            case .acquirer:
                CooperationAcquirerView(onScanBind: {
                    showBindScanner = true
                })
            case let .bind(saleUserId):
                BindAcquirerView(saleUserId: saleUserId, onSuccess: {
                    route = .acquirer
                })
            }
        }
        .task {
            await reloadCurrentTab(showLoading: true)
        }
        .onChange(of: viewModel.selectedTab) { _ in
            Task { await reloadCurrentTab(showLoading: true) }
        }
    }

    private func reloadCurrentTab(showLoading: Bool) async {
        await globalLoading.withOptionalLoading(showLoading) {
            await viewModel.refreshCurrentTab(api: cooperationOrderAPI)
        }
    }

    private func searchOrders(showLoading: Bool) async {
        await globalLoading.withOptionalLoading(showLoading) {
            await viewModel.searchOrders(api: cooperationOrderAPI)
        }
    }

    private func emptyState(_ text: String) -> some View {
        Text(text)
            .font(.system(size: 14))
            .foregroundStyle(CooperationOrderColors.text999)
            .frame(maxWidth: .infinity)
            .padding(.vertical, 48)
    }
}