//
//  PaymentCollectionViewController.swift
//  suixinkan
//
//  Created by Codex on 2026/6/26.
//

import SnapKit
import UIKit

/// 收款页。
final class PaymentCollectionViewController: UIViewController {
    private let services = AppServices.shared
    private let viewModel = PaymentCollectionViewModel()
    private let qrImageView = UIImageView()
    private let statusLabel = UILabel()
    private let amountField = UITextField()
    private let remarkField = UITextField()
    private let activityIndicator = UIActivityIndicatorView(style: .large)

    /// 视图加载完成后的 UI 初始化与数据绑定。
    override func viewDidLoad() {
        super.viewDidLoad()
        title = "收款"
        view.backgroundColor = UIColor(hex: 0xF5F7FA)
        setupUI()
        viewModel.onChange = { [weak self] in self?.render() }
        Task { await viewModel.loadPayCode(api: services.paymentAPI, scenicId: services.currentScenicId) }
    }

    /// 初始化UI相关 UI 或状态。
    private func setupUI() {
        qrImageView.contentMode = .scaleAspectFit
        statusLabel.numberOfLines = 0
        statusLabel.textAlignment = .center
        statusLabel.textColor = AppDesign.textSecondary
        amountField.placeholder = "动态金额"
        amountField.borderStyle = .roundedRect
        amountField.keyboardType = .decimalPad
        remarkField.placeholder = "备注"
        remarkField.borderStyle = .roundedRect

        let stack = UIStackView(arrangedSubviews: [qrImageView, statusLabel, amountField, remarkField])
        stack.axis = .vertical
        stack.spacing = 12
        view.addSubview(stack)
        view.addSubview(activityIndicator)
        stack.snp.makeConstraints { make in
            make.top.equalTo(view.safeAreaLayoutGuide).offset(24)
            make.leading.trailing.equalToSuperview().inset(24)
        }
        qrImageView.snp.makeConstraints { $0.height.equalTo(240) }
        activityIndicator.snp.makeConstraints { $0.center.equalTo(qrImageView) }

        navigationItem.rightBarButtonItems = [
            UIBarButtonItem(title: "生成", style: .plain, target: self, action: #selector(applyAmount)),
            UIBarButtonItem(title: "轮询", style: .plain, target: self, action: #selector(togglePolling))
        ]
    }

    /// render 业务逻辑。
    private func render() {
        qrImageView.image = viewModel.qrImage
        statusLabel.text = viewModel.errorMessage ?? String(describing: viewModel.status)
        if viewModel.isLoading { activityIndicator.startAnimating() } else { activityIndicator.stopAnimating() }
    }

    /// apply金额相关逻辑。
    @objc private func applyAmount() {
        viewModel.amountText = amountField.text ?? ""
        viewModel.remarkText = remarkField.text ?? ""
        _ = viewModel.applyDynamicAmount()
    }

    /// togglePolling相关逻辑。
    @objc private func togglePolling() {
        Task {
            await viewModel.pollUntilPaymentDetected(
                api: services.paymentAPI,
                scenicId: services.currentScenicId
            )
        }
    }
}

extension PaymentCollectionViewModel: ViewModelBindable {}