//
//  PaymentSetAmountDialogView.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 设置收款金额弹窗，对齐 Android `SetAmountDialog`。
final class PaymentSetAmountDialogView: KeyboardAvoidingDialogView {

    var onConfirm: (() -> Void)?
    var onCancel: (() -> Void)?
    var onAmountChange: ((String) -> Void)?
    var onRemarkChange: ((String) -> Void)?

    private let dimView = UIView()
    private let cardView = UIView()
    private let titleLabel = UILabel()
    private let amountContainer = UIView()
    private let currencyLabel = UILabel()
    private let amountField = UITextField()
    private let remarkTitleLabel = UILabel()
    private let remarkField = UITextView()
    private let remarkCountLabel = UILabel()
    private let buttonStack = UIStackView()
    private let cancelButton = UIButton(type: .system)
    private let confirmButton = UIButton(type: .system)

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

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

    func apply(amount: String, remark: String) {
        if amountField.text != amount {
            amountField.text = amount
        }
        if remarkField.text != remark {
            remarkField.text = remark
        }
        remarkCountLabel.text = "\(remark.count)/200"
    }

    func show(in parent: UIView) {
        frame = parent.bounds
        autoresizingMask = [.flexibleWidth, .flexibleHeight]
        alpha = 0
        parent.addSubview(self)
        layoutIfNeeded()
        amountField.becomeFirstResponder()
        UIView.animate(withDuration: 0.2) {
            self.alpha = 1
        }
    }

    func dismiss() {
        endEditing(true)
        UIView.animate(withDuration: 0.2, animations: {
            self.alpha = 0
        }, completion: { _ in
            self.removeFromSuperview()
        })
    }

    private func setupUI() {
        keyboardAvoidingContentView = cardView

        dimView.backgroundColor = AppColor.overlayScrim
        dimView.addGestureRecognizer(UITapGestureRecognizer(target: self, action: #selector(cancelTapped)))

        cardView.backgroundColor = .white
        cardView.layer.cornerRadius = AppRadius.xl
        cardView.clipsToBounds = true

        titleLabel.text = "收款金额"
        titleLabel.font = .systemFont(ofSize: 18, weight: .bold)
        titleLabel.textColor = AppColor.textPrimary

        amountContainer.backgroundColor = AppColor.inputBackground
        amountContainer.layer.cornerRadius = AppRadius.sm

        currencyLabel.text = "¥"
        currencyLabel.font = .systemFont(ofSize: 20, weight: .bold)
        currencyLabel.textColor = AppColor.textPrimary

        amountField.placeholder = "请输入收款金额"
        amountField.font = .systemFont(ofSize: 18, weight: .medium)
        amountField.keyboardType = .decimalPad
        amountField.borderStyle = .none
        amountField.backgroundColor = .clear
        amountField.addTarget(self, action: #selector(amountChanged), for: .editingChanged)

        remarkTitleLabel.text = "备注 (选填)"
        remarkTitleLabel.font = .systemFont(ofSize: 14)
        remarkTitleLabel.textColor = UIColor(hex: 0x4B5563)

        remarkField.font = .systemFont(ofSize: 14)
        remarkField.textColor = AppColor.textPrimary
        remarkField.backgroundColor = .white
        remarkField.layer.borderColor = UIColor(hex: 0xE5E7EB).cgColor
        remarkField.layer.borderWidth = 1
        remarkField.layer.cornerRadius = AppRadius.sm
        remarkField.textContainerInset = UIEdgeInsets(top: 10, left: 8, bottom: 10, right: 8)
        remarkField.delegate = self

        remarkCountLabel.font = .systemFont(ofSize: 12)
        remarkCountLabel.textColor = AppColor.textTertiary
        remarkCountLabel.textAlignment = .right
        remarkCountLabel.text = "0/200"

        buttonStack.axis = .horizontal
        buttonStack.spacing = AppSpacing.sm
        buttonStack.distribution = .fillEqually

        cancelButton.setTitle("取消", for: .normal)
        cancelButton.setTitleColor(AppColor.textSecondary, for: .normal)
        cancelButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        cancelButton.backgroundColor = AppColor.inputBackground
        cancelButton.layer.cornerRadius = AppRadius.sm
        cancelButton.addTarget(self, action: #selector(cancelTapped), for: .touchUpInside)

        confirmButton.setTitle("确定", for: .normal)
        confirmButton.setTitleColor(.white, for: .normal)
        confirmButton.titleLabel?.font = .systemFont(ofSize: 16, weight: .medium)
        confirmButton.backgroundColor = AppColor.primary
        confirmButton.layer.cornerRadius = AppRadius.sm
        confirmButton.addTarget(self, action: #selector(confirmTapped), for: .touchUpInside)

        addSubview(dimView)
        addSubview(cardView)
        cardView.addSubview(titleLabel)
        cardView.addSubview(amountContainer)
        amountContainer.addSubview(currencyLabel)
        amountContainer.addSubview(amountField)
        cardView.addSubview(remarkTitleLabel)
        cardView.addSubview(remarkField)
        cardView.addSubview(remarkCountLabel)
        cardView.addSubview(buttonStack)
        buttonStack.addArrangedSubview(cancelButton)
        buttonStack.addArrangedSubview(confirmButton)

        dimView.snp.makeConstraints { make in
            make.edges.equalToSuperview()
        }
        cardView.snp.makeConstraints { make in
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
            keyboardAvoidingCenterYConstraint = make.centerY.equalToSuperview().constraint
        }
        titleLabel.snp.makeConstraints { make in
            make.top.leading.trailing.equalToSuperview().inset(AppSpacing.md)
        }
        amountContainer.snp.makeConstraints { make in
            make.top.equalTo(titleLabel.snp.bottom).offset(20)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
            make.height.equalTo(48)
        }
        currencyLabel.snp.makeConstraints { make in
            make.leading.equalToSuperview().offset(AppSpacing.sm)
            make.centerY.equalToSuperview()
        }
        amountField.snp.makeConstraints { make in
            make.leading.equalTo(currencyLabel.snp.trailing).offset(AppSpacing.xs)
            make.trailing.equalToSuperview().inset(AppSpacing.sm)
            make.centerY.equalToSuperview()
        }
        remarkTitleLabel.snp.makeConstraints { make in
            make.top.equalTo(amountContainer.snp.bottom).offset(AppSpacing.md)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
        }
        remarkField.snp.makeConstraints { make in
            make.top.equalTo(remarkTitleLabel.snp.bottom).offset(AppSpacing.xs)
            make.leading.trailing.equalToSuperview().inset(AppSpacing.md)
            make.height.equalTo(100)
        }
        remarkCountLabel.snp.makeConstraints { make in
            make.top.equalTo(remarkField.snp.bottom).offset(AppSpacing.xxs)
            make.trailing.equalToSuperview().inset(AppSpacing.md)
        }
        buttonStack.snp.makeConstraints { make in
            make.top.equalTo(remarkCountLabel.snp.bottom).offset(AppSpacing.lg)
            make.leading.trailing.bottom.equalToSuperview().inset(AppSpacing.md)
            make.height.equalTo(44)
        }
    }

    @objc private func amountChanged() {
        onAmountChange?(amountField.text ?? "")
    }

    @objc private func cancelTapped() {
        onCancel?()
    }

    @objc private func confirmTapped() {
        onConfirm?()
    }
}

extension PaymentSetAmountDialogView: UITextViewDelegate {
    func textViewDidChange(_ textView: UITextView) {
        onRemarkChange?(textView.text ?? "")
    }
}