//
//  CooperationAcquirerViewController.swift
//  suixinkan
//

import AVFoundation
import SnapKit
import UIKit

/// 合作获客员页，对齐 Android `CooperationAcquirerScreen`。
final class CooperationAcquirerViewController: BaseViewController, UITableViewDataSource, UITableViewDelegate {

    private let viewModel = CooperationAcquirerViewModel()
    private let orderAPI = NetworkServices.shared.orderAPI

    private let tableView = UITableView(frame: .zero, style: .plain)
    private let refreshControl = UIRefreshControl()
    private let emptyLabel = UILabel()
    private var shouldRefreshOnAppear = false

    override func setupNavigationBar() {
        title = "合作获客员"
        navigationItem.rightBarButtonItem = UIBarButtonItem(
            title: "扫码绑定",
            style: .plain,
            target: self,
            action: #selector(startScanBind)
        )
        navigationItem.rightBarButtonItem?.tintColor = AppColor.primary
    }

    override func setupUI() {
        tableView.backgroundColor = .clear
        tableView.separatorStyle = .none
        tableView.dataSource = self
        tableView.delegate = self
        tableView.register(CooperationAcquirerCell.self, forCellReuseIdentifier: CooperationAcquirerCell.reuseIdentifier)
        tableView.refreshControl = refreshControl

        emptyLabel.text = "暂无合作获客员"
        emptyLabel.font = .systemFont(ofSize: 14)
        emptyLabel.textColor = AppColor.textTertiary
        emptyLabel.textAlignment = .center
        emptyLabel.isHidden = true

        view.addSubview(tableView)
        view.addSubview(emptyLabel)
    }

    override func setupConstraints() {
        tableView.snp.makeConstraints { make in
            make.edges.equalTo(view.safeAreaLayoutGuide)
        }
        emptyLabel.snp.makeConstraints { make in
            make.center.equalTo(tableView)
        }
    }

    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.onNavigateBindAcquirer = { [weak self] saleUserId in
            Task { @MainActor in self?.pushBindAcquirer(saleUserId: saleUserId) }
        }
        refreshControl.addTarget(self, action: #selector(refreshTriggered), for: .valueChanged)
    }

    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
        }
        if shouldRefreshOnAppear {
            shouldRefreshOnAppear = false
            Task { await viewModel.refresh(api: orderAPI) }
        }
    }

    override func viewDidLoad() {
        super.viewDidLoad()
        Task {
            showLoading()
            defer { hideLoading() }
            await viewModel.loadAcquirers(api: orderAPI, initial: true)
        }
    }

    @objc private func startScanBind() {
        switch AVCaptureDevice.authorizationStatus(for: .video) {
        case .authorized:
            presentScanner()
        case .notDetermined:
            AVCaptureDevice.requestAccess(for: .video) { [weak self] granted in
                Task { @MainActor in
                    if granted {
                        self?.presentScanner()
                    }
                }
            }
        default:
            showToast("需要相机权限才能扫码")
        }
    }

    @objc private func refreshTriggered() {
        Task { await viewModel.refresh(api: orderAPI) }
    }

    private func presentScanner() {
        let scanner = QRCodeScannerViewController()
        scanner.onScanResult = { [weak self] result in
            self?.viewModel.processScanResult(result)
        }
        let nav = UINavigationController(rootViewController: scanner)
        nav.modalPresentationStyle = .fullScreen
        present(nav, animated: true)
    }

    private func pushBindAcquirer(saleUserId: Int) {
        let controller = BindAcquirerViewController(saleUserId: saleUserId)
        controller.onBindSuccess = { [weak self] in
            self?.shouldRefreshOnAppear = true
            self?.navigationController?.popViewController(animated: true)
        }
        if presentedViewController != nil {
            dismiss(animated: true) { [weak self] in
                self?.navigationController?.pushViewController(controller, animated: true)
            }
            return
        }
        navigationController?.pushViewController(controller, animated: true)
    }

    private func applyViewModel() {
        if viewModel.isRefreshing {
            if !refreshControl.isRefreshing { refreshControl.beginRefreshing() }
        } else {
            refreshControl.endRefreshing()
        }
        emptyLabel.isHidden = !viewModel.acquirers.isEmpty || viewModel.isRefreshing
        tableView.reloadData()
    }

    private func presentRemarkDialog(for acquirer: CooperativeSalerEntity) {
        viewModel.startEditRemark(acquirer)
        let alert = UIAlertController(title: "修改备注", message: "最多\(CooperationOrderFeature.remarkNameMaxLength)个字符", preferredStyle: .alert)
        alert.addTextField { [weak self] field in
            field.text = self?.viewModel.remarkDraft
        }
        alert.addAction(UIAlertAction(title: "取消", style: .cancel) { [weak self] _ in
            self?.viewModel.dismissRemarkDialog()
        })
        alert.addAction(UIAlertAction(title: "保存", style: .default) { [weak self] _ in
            guard let self else { return }
            if let text = alert.textFields?.first?.text {
                self.viewModel.updateRemarkDraft(text)
            }
            Task { await self.viewModel.saveRemark(api: self.orderAPI) }
        })
        present(alert, animated: true)
    }

    private func presentCommissionDialog(for acquirer: CooperativeSalerEntity) {
        viewModel.startEditCommissionRate(acquirer)
        let alert = UIAlertController(title: "修改分成比例", message: nil, preferredStyle: .alert)
        alert.addTextField { [weak self] field in
            field.placeholder = "分成比例 0-100"
            field.keyboardType = .numberPad
            field.text = self?.viewModel.commissionRateDraft
        }
        alert.addTextField { [weak self] field in
            field.placeholder = "验证码"
            field.keyboardType = .numberPad
            field.text = self?.viewModel.commissionSmsCodeDraft
        }
        let phone = acquirer.salerPhone.isEmpty ? acquirer.displayPhone : acquirer.salerPhone
        alert.message = "验证码将发送至 \(CooperationOrderPhoneMask.mask(phone))"

        alert.addAction(UIAlertAction(title: "取消", style: .cancel) { [weak self] _ in
            self?.viewModel.dismissCommissionRateDialog()
        })
        alert.addAction(UIAlertAction(title: "获取验证码", style: .default) { [weak self] _ in
            guard let self else { return }
            if let rateText = alert.textFields?.first?.text {
                self.viewModel.updateCommissionRateDraft(rateText)
            }
            if let codeText = alert.textFields?.last?.text {
                self.viewModel.updateCommissionSmsCodeDraft(codeText)
            }
            Task { await self.viewModel.requestCommissionSmsCode(api: self.orderAPI) }
        })
        alert.addAction(UIAlertAction(title: "确认修改", style: .default) { [weak self] _ in
            guard let self else { return }
            if let rateText = alert.textFields?.first?.text {
                self.viewModel.updateCommissionRateDraft(rateText)
            }
            if let codeText = alert.textFields?.last?.text {
                self.viewModel.updateCommissionSmsCodeDraft(codeText)
            }
            Task { await self.viewModel.saveCommissionRate(api: self.orderAPI) }
        })
        present(alert, animated: true)
    }

    func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
        viewModel.acquirers.count
    }

    func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
        guard let cell = tableView.dequeueReusableCell(
            withIdentifier: CooperationAcquirerCell.reuseIdentifier,
            for: indexPath
        ) as? CooperationAcquirerCell else {
            return UITableViewCell()
        }
        let acquirer = viewModel.acquirers[indexPath.row]
        cell.configure(with: acquirer)
        cell.onEditRemark = { [weak self] in
            self?.presentRemarkDialog(for: acquirer)
        }
        cell.onEditCommission = { [weak self] in
            self?.presentCommissionDialog(for: acquirer)
        }
        cell.onCall = {
            let phone = acquirer.displayPhone.trimmingCharacters(in: .whitespacesAndNewlines)
            guard !phone.isEmpty, let url = URL(string: "tel://\(phone)") else { return }
            UIApplication.shared.open(url)
        }
        return cell
    }
}