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

import Foundation
import Combine

/// 合作订单列表 ViewModel，管理获客线索与获客订单双 Tab 分页。
@MainActor
final class CooperationOrderListViewModel: ObservableObject {
    @Published var selectedTab = 0
    @Published var searchText = ""
    @Published var leads: [ReferralLead] = []
    @Published var orders: [AcquisitionOrder] = []
    @Published var isLoadingMore = false
    @Published var canLoadMore = false
    @Published private(set) var hasLoadedLeadsOnce = false
    @Published private(set) var hasLoadedOrdersOnce = false

    private var leadsPage = 1
    private var ordersPage = 1
    private var leadsTotal = 0
    private var ordersTotal = 0
    private var isReloading = false
    private let pageSize = 10

    /// 切换 Tab 并触发对应列表刷新。
    func onTabSelected(_ index: Int) {
        guard selectedTab != index else { return }
        selectedTab = index
    }

    /// 刷新当前 Tab 列表。
    func refreshCurrentTab(api: CooperationOrderServing) async {
        if selectedTab == 0 {
            await refreshLeads(api: api)
        } else {
            await refreshOrders(api: api)
        }
    }

    /// 刷新获客线索列表。
    func refreshLeads(api: CooperationOrderServing) async {
        guard !isReloading else { return }
        isReloading = true
        defer { isReloading = false }
        leadsPage = 1
        isLoadingMore = false
        await loadLeads(api: api)
    }

    /// 刷新获客订单列表。
    func refreshOrders(api: CooperationOrderServing) async {
        guard !isReloading else { return }
        isReloading = true
        defer { isReloading = false }
        ordersPage = 1
        isLoadingMore = false
        await loadOrders(api: api)
    }

    /// 加载更多当前 Tab 数据。
    func loadMore(api: CooperationOrderServing) async {
        guard !isReloading, !isLoadingMore, canLoadMore else { return }
        isLoadingMore = true
        if selectedTab == 0 {
            leadsPage += 1
            await loadLeads(api: api)
        } else {
            ordersPage += 1
            await loadOrders(api: api)
        }
    }

    /// 按关键词搜索获客订单。
    func searchOrders(api: CooperationOrderServing) async {
        guard selectedTab == 1 else { return }
        await refreshOrders(api: api)
    }

    private func loadLeads(api: CooperationOrderServing) async {
        do {
            let data = try await api.saleUserReferralLeads(page: leadsPage, pageSize: pageSize)
            leadsTotal = data.total
            if leadsPage == 1 {
                leads = data.list
            } else {
                leads.append(contentsOf: data.list)
            }
            canLoadMore = leads.count < leadsTotal
        } catch {
            if leadsPage == 1, !hasLoadedLeadsOnce {
                leads = []
            }
        }
        if leadsPage == 1 {
            hasLoadedLeadsOnce = true
        }
        isLoadingMore = false
    }

    private func loadOrders(api: CooperationOrderServing) async {
        do {
            let keyword = searchText.trimmingCharacters(in: .whitespacesAndNewlines)
            let data = try await api.saleUserAcquisitionOrders(
                keyword: keyword.isEmpty ? nil : keyword,
                page: ordersPage,
                pageSize: pageSize
            )
            ordersTotal = data.total
            if ordersPage == 1 {
                orders = data.list
            } else {
                orders.append(contentsOf: data.list)
            }
            canLoadMore = orders.count < ordersTotal
        } catch {
            if ordersPage == 1, !hasLoadedOrdersOnce {
                orders = []
            }
        }
        if ordersPage == 1 {
            hasLoadedOrdersOnce = true
        }
        isLoadingMore = false
    }
}