//
//  BindAcquirerViewModel.swift
//  suixinkan
//

import Foundation

/// 接受邀请 / 绑定获客员 ViewModel，对齐 Android `BindAcquirerViewModel`。
final class BindAcquirerViewModel {

    private(set) var inviteInfo: SaleUserInviteInfoResponse?
    private(set) var isLoading = false
    private(set) var isAlreadyBound = false
    private(set) var commissionRateDraft = ""

    var onStateChange: (() -> Void)?
    var onShowMessage: ((String) -> Void)?
    var onBindSuccess: (() -> Void)?
    var onShouldPop: (() -> Void)?

    private var saleUserId = 0

    func initSaleUserId(_ id: Int) {
        guard saleUserId != id || (inviteInfo == nil && !isAlreadyBound) else { return }
        saleUserId = id
        isAlreadyBound = false
        commissionRateDraft = ""
        inviteInfo = nil
        notifyStateChange()
    }

    func updateCommissionRateDraft(_ text: String) {
        commissionRateDraft = String(text.filter(\.isNumber).prefix(3))
        notifyStateChange()
    }

    func loadInviteInfo(api: OrderAPI) async {
        guard saleUserId > 0 else {
            onShowMessage?("获客员信息无效")
            onShouldPop?()
            return
        }
        isLoading = true
        notifyStateChange()
        do {
            let data = try await api.saleUserInviteInfo(saleUserId: String(saleUserId))
            let resolvedSaleUserId = data.saleUserId > 0 ? data.saleUserId : saleUserId
            inviteInfo = SaleUserInviteInfoResponse(
                saleUserId: resolvedSaleUserId,
                isBound: data.isBound,
                photographerName: data.photographerName,
                photographerPhone: data.photographerPhone,
                salerName: data.salerName,
                salerPhone: data.salerPhone,
                shareCode: data.shareCode,
                subtitle: data.subtitle,
                title: data.title
            )
            if data.isBound {
                isAlreadyBound = true
            }
        } catch {
            handleBindError(error.localizedDescription.isEmpty ? "获取邀请信息失败" : error.localizedDescription)
        }
        isLoading = false
        notifyStateChange()
    }

    func acceptBind(api: OrderAPI) async {
        guard saleUserId > 0, !isAlreadyBound else { return }
        guard let commissionRate = Int(commissionRateDraft.trimmingCharacters(in: .whitespacesAndNewlines)) else {
            onShowMessage?("请输入分账比例")
            return
        }
        guard (0...100).contains(commissionRate) else {
            onShowMessage?("分账比例需在0到100之间")
            return
        }
        do {
            try await api.saleUserAcceptBind(saleUserId: saleUserId, commissionRate: commissionRate)
            onShowMessage?("绑定成功")
            onBindSuccess?()
        } catch {
            handleBindError(error.localizedDescription.isEmpty ? "绑定失败" : error.localizedDescription)
        }
    }

    private func handleBindError(_ message: String) {
        onShowMessage?(message)
        if message.contains("已绑定") {
            isAlreadyBound = true
            notifyStateChange()
            return
        }
        onShouldPop?()
    }

    private func notifyStateChange() {
        onStateChange?()
    }
}