//
//  BindAcquirerViewController.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 接受邀请 / 绑定获客员页，对齐 Android `BindAcquirerScreen`。
final class BindAcquirerViewController: BaseViewController {

    var onBindSuccess: (() -> Void)?

    private let saleUserId: Int
    private let viewModel = BindAcquirerViewModel()
    private let orderAPI = NetworkServices.shared.orderAPI

    private let scrollView = UIScrollView()
    private let contentStack = UIStackView()
    private let headerCard = UIView()
    private let headerIcon = UIImageView()
    private let headerTitleLabel = UILabel()
    private let infoCard = UIView()
    private let salerRow = CooperationInfoRowView(label: "获客员")
    private let phoneRow = CooperationInfoRowView(label: "手机号")
    private let commissionField = UITextField()
    private let acceptButton = AppButton(title: "接受邀请")
    private let loadingIndicator = UIActivityIndicatorView(style: .large)
    private let bottomBar = UIView()

    init(saleUserId: Int) {
        self.saleUserId = saleUserId
        super.init(nibName: nil, bundle: nil)
    }

    @available(*, unavailable)
    required init?(coder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func setupNavigationBar() {
        title = "接受邀请"
    }

    override func setupUI() {
        contentStack.axis = .vertical
        contentStack.spacing = AppSpacing.sm

        headerCard.backgroundColor = AppColor.primary
        headerCard.layer.cornerRadius = AppRadius.md
        headerIcon.image = UIImage(systemName: "person.fill")
        headerIcon.tintColor = .white
        headerTitleLabel.text = "邀请信息"
        headerTitleLabel.font = .systemFont(ofSize: 16, weight: .bold)
        headerTitleLabel.textColor = .white

        infoCard.backgroundColor = .white
        infoCard.layer.cornerRadius = AppRadius.md

        commissionField.placeholder = "请输入分账比例（0-100）"
        commissionField.keyboardType = .numberPad
        commissionField.borderStyle = .roundedRect
        commissionField.font = .systemFont(ofSize: 15)

        bottomBar.backgroundColor = .white
        acceptButton.addTarget(self, action: #selector(acceptTapped), for: .touchUpInside)

        loadingIndicator.hidesWhenStopped = true
        loadingIndicator.color = AppColor.primary

        view.addSubview(scrollView)
        view.addSubview(bottomBar)
        scrollView.addSubview(contentStack)
        bottomBar.addSubview(acceptButton)
        scrollView.addSubview(loadingIndicator)

        contentStack.addArrangedSubview(headerCard)
        contentStack.addArrangedSubview(infoCard)

        headerCard.addSubview(headerIcon)
        headerCard.addSubview(headerTitleLabel)

        let infoStack = UIStackView(arrangedSubviews: [salerRow, phoneRow, commissionField])
        infoStack.axis = .vertical
        infoStack.spacing = AppSpacing.sm
        infoCard.addSubview(infoStack)
        infoStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(AppSpacing.md)
        }

        headerIcon.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(AppSpacing.md)
            make.centerY.equalToSuperview()
            make.size.equalTo(24)
        }
        headerTitleLabel.snp.makeConstraints { make in
            make.leading.equalTo(headerIcon.snp.trailing).offset(AppSpacing.sm)
            make.trailing.equalToSuperview().inset(AppSpacing.md)
            make.top.bottom.equalToSuperview().inset(AppSpacing.md)
        }
        headerCard.snp.makeConstraints { make in
            make.height.greaterThanOrEqualTo(56)
        }
        commissionField.snp.makeConstraints { make in
            make.height.equalTo(44)
        }
    }

    override func setupConstraints() {
        bottomBar.snp.makeConstraints { make in
            make.leading.trailing.bottom.equalToSuperview()
        }
        acceptButton.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(AppSpacing.md)
        }
        scrollView.snp.makeConstraints { make in
            make.top.leading.trailing.equalTo(view.safeAreaLayoutGuide)
            make.bottom.equalTo(bottomBar.snp.top)
        }
        contentStack.snp.makeConstraints { make in
            make.edges.equalToSuperview().inset(AppSpacing.md)
            make.width.equalTo(scrollView.snp.width).offset(-AppSpacing.md * 2)
        }
        loadingIndicator.snp.makeConstraints { make in
            make.center.equalTo(scrollView)
        }
    }

    override func bindActions() {
        viewModel.onStateChange = { [weak self] in
            Task { @MainActor in self?.applyViewModel() }
        }
        viewModel.onShowMessage = { [weak self] message in
            Task { @MainActor in self?.showToast(message) }
        }
        viewModel.onBindSuccess = { [weak self] in
            Task { @MainActor in
                if let callback = self?.onBindSuccess {
                    callback()
                } else {
                    self?.navigationController?.popViewController(animated: true)
                }
            }
        }
        viewModel.onShouldPop = { [weak self] in
            Task { @MainActor in self?.navigationController?.popViewController(animated: true) }
        }
        commissionField.addTarget(self, action: #selector(commissionChanged), for: .editingChanged)
    }

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)
        guard CooperationOrderFeature.hasPermission(in: AppStore.shared.permissionItems()) else {
            showToast("暂无合作订单权限")
            navigationController?.popViewController(animated: false)
            return
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        viewModel.initSaleUserId(saleUserId)
        Task { await viewModel.loadInviteInfo(api: orderAPI) }
    }

    @objc private func commissionChanged() {
        viewModel.updateCommissionRateDraft(commissionField.text ?? "")
    }

    @objc private func acceptTapped() {
        Task { await viewModel.acceptBind(api: orderAPI) }
    }

    private func applyViewModel() {
        if viewModel.isLoading, viewModel.inviteInfo == nil {
            loadingIndicator.startAnimating()
            contentStack.isHidden = true
            bottomBar.isHidden = true
            return
        }
        loadingIndicator.stopAnimating()
        contentStack.isHidden = false
        bottomBar.isHidden = false

        if let info = viewModel.inviteInfo {
            title = info.title.isEmpty ? "接受邀请" : info.title
            salerRow.setValue(info.salerName.isEmpty ? "—" : info.salerName)
            phoneRow.setValue(info.salerPhone.isEmpty ? "—" : info.salerPhone)
        }

        commissionField.text = viewModel.commissionRateDraft
        commissionField.isEnabled = !viewModel.isAlreadyBound
        acceptButton.isEnabled = !viewModel.isAlreadyBound
        acceptButton.setTitle(viewModel.isAlreadyBound ? "已绑定获客员" : "接受邀请", for: .normal)
    }
}