import SnapKit
import UIKit

/// 收款页中的线下收款入口、今日汇总和逾期提醒区域。
@MainActor
final class OfflineCollectionHomeView: UIView {
    var onRegister: (() -> Void)?
    var onOpenToday: (() -> Void)?
    var onOpenOverdue: (() -> Void)?
    var onRetry: (() -> Void)?

    private let stack = UIStackView()
    private let statusButton = UIButton(type: .system)
    private let overdueCard = OfflineCollectionHomeCard()
    private let registerCard = OfflineCollectionHomeCard()
    private let todayCard = OfflineCollectionHomeCard()

    override init(frame: CGRect) {
        super.init(frame: frame)
        stack.axis = .vertical
        stack.spacing = AppSpacing.md
        let title = UILabel()
        title.text = "线下收款"
        title.font = .systemFont(ofSize: 16, weight: .semibold)
        title.textColor = AppColor.textPrimary
        stack.addArrangedSubview(title)
        stack.addArrangedSubview(statusButton)
        stack.addArrangedSubview(overdueCard)
        stack.addArrangedSubview(registerCard)
        stack.addArrangedSubview(todayCard)
        addSubview(stack)
        stack.snp.makeConstraints { make in make.edges.equalToSuperview() }
        title.snp.makeConstraints { make in make.height.equalTo(24) }

        statusButton.configuration = .plain()
        statusButton.configuration?.baseForegroundColor = AppColor.primary
        statusButton.addTarget(self, action: #selector(retryTapped), for: .touchUpInside)
        statusButton.isHidden = true

        registerCard.apply(
            title: "线下收款登记",
            detail: "线下收款后，请及时登记并在当日完成补缴",
            action: "去登记",
            image: "plus.circle.fill",
            tint: AppColor.primary,
            background: .white
        )
        registerCard.addTarget(self, action: #selector(registerTapped), for: .touchUpInside)
        todayCard.addTarget(self, action: #selector(todayTapped), for: .touchUpInside)
        overdueCard.addTarget(self, action: #selector(overdueTapped), for: .touchUpInside)
    }

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

    /// 根据真实统计接口状态刷新区域。
    func apply(
        today: OfflineDailySummary,
        overdueDayCount: Int,
        overdueRecordCount: Int,
        overdueAmountFen: Int,
        errorMessage: String?
    ) {
        if let errorMessage {
            statusButton.configuration?.title = "\(errorMessage)  点击重试"
            statusButton.configuration?.showsActivityIndicator = false
            statusButton.isUserInteractionEnabled = true
            statusButton.isHidden = false
            statusButton.accessibilityTraits.insert(.button)
        } else {
            statusButton.isHidden = true
        }

        let hasOverdue = overdueDayCount > 0
        overdueCard.isHidden = !hasOverdue
        if hasOverdue {
            overdueCard.apply(
                title: "存在逾期未补缴",
                detail: "\(overdueDayCount) 个营业日，共 \(overdueRecordCount) 笔，待补缴 \(OfflineCollectionMoney.display(overdueAmountFen))",
                action: "立即处理",
                image: "exclamationmark.circle.fill",
                tint: AppColor.danger,
                background: UIColor(hex: 0xFFF1F0)
            )
        }

        let settled = today.totalCount > 0 && today.pendingCount == 0
        todayCard.apply(
            title: "今日待补缴 \(OfflineCollectionMoney.display(today.pendingAmountFen))",
            detail: "\(today.pendingCount) 笔 · 今日已登记 \(OfflineCollectionMoney.display(today.totalAmountFen))\(settled ? " · 已结清" : "")",
            action: today.pendingCount > 0 ? "去补缴" : "查看明细",
            image: "calendar",
            tint: today.pendingCount > 0 ? UIColor(hex: 0xD97706) : AppColor.primary,
            background: .white
        )
    }

    @objc private func retryTapped() { onRetry?() }
    @objc private func registerTapped() { onRegister?() }
    @objc private func todayTapped() { onOpenToday?() }
    @objc private func overdueTapped() { onOpenOverdue?() }
}

/// 线下收款首页区域的统一可点击卡片。
private final class OfflineCollectionHomeCard: UIControl {
    private let iconView = UIImageView()
    private let titleLabel = UILabel()
    private let detailLabel = UILabel()
    private let actionLabel = UILabel()

    override init(frame: CGRect) {
        super.init(frame: frame)
        layer.cornerRadius = AppRadius.lg
        clipsToBounds = true
        isAccessibilityElement = true
        iconView.contentMode = .scaleAspectFit
        titleLabel.font = .systemFont(ofSize: 15, weight: .semibold)
        titleLabel.textColor = AppColor.textPrimary
        detailLabel.font = .systemFont(ofSize: 13)
        detailLabel.textColor = AppColor.textSecondary
        detailLabel.numberOfLines = 0
        actionLabel.font = .systemFont(ofSize: 13, weight: .semibold)
        actionLabel.textColor = AppColor.primary
        actionLabel.setContentCompressionResistancePriority(.required, for: .horizontal)
        let textStack = UIStackView(arrangedSubviews: [titleLabel, detailLabel])
        textStack.axis = .vertical
        textStack.spacing = 5
        [iconView, titleLabel, detailLabel, actionLabel, textStack].forEach {
            $0.isUserInteractionEnabled = false
        }
        addSubview(iconView)
        addSubview(textStack)
        addSubview(actionLabel)
        iconView.snp.makeConstraints { make in make.leading.equalToSuperview().inset(AppSpacing.md); make.centerY.equalToSuperview(); make.width.height.equalTo(30) }
        textStack.snp.makeConstraints { make in make.leading.equalTo(iconView.snp.trailing).offset(AppSpacing.sm); make.top.bottom.equalToSuperview().inset(AppSpacing.md); make.trailing.lessThanOrEqualTo(actionLabel.snp.leading).offset(-AppSpacing.sm) }
        actionLabel.snp.makeConstraints { make in make.trailing.equalToSuperview().inset(AppSpacing.md); make.centerY.equalToSuperview() }
        snp.makeConstraints { make in make.height.greaterThanOrEqualTo(86) }
    }

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

    override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {
        guard isEnabled,
              isUserInteractionEnabled,
              !isHidden,
              alpha > 0.01,
              self.point(inside: point, with: event) else { return nil }
        return self
    }

    override var isHighlighted: Bool {
        didSet {
            UIView.animate(withDuration: 0.12) {
                self.alpha = self.isHighlighted ? 0.78 : 1
            }
        }
    }

    func apply(title: String, detail: String, action: String, image: String, tint: UIColor, background: UIColor) {
        titleLabel.text = title
        detailLabel.text = detail
        actionLabel.text = "\(action)  ›"
        iconView.image = UIImage(systemName: image)
        iconView.tintColor = tint
        backgroundColor = background
        accessibilityLabel = "\(title)，\(detail)，\(action)"
        accessibilityTraits = .button
    }
}