//
//  AgreementRowView.swift
//  suixinkan
//

import SnapKit
import UIKit

/// 协议勾选行，对应 Android `AgreementRow`。
final class AgreementRowView: UIView, UITextViewDelegate {

    private let checkButton = UIButton(type: .custom)
    private let textView = UITextView()

    var isChecked = false {
        didSet { updateCheckboxImage() }
    }

    var onCheckedChange: (() -> Void)?
    var onUserAgreementTap: (() -> Void)?
    var onPrivacyPolicyTap: (() -> Void)?

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

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

    private func setupUI() {
        checkButton.addTarget(self, action: #selector(checkButtonTapped), for: .touchUpInside)
        updateCheckboxImage()

        textView.backgroundColor = .clear
        textView.isEditable = false
        textView.isScrollEnabled = false
        textView.textContainerInset = .zero
        textView.textContainer.lineFragmentPadding = 0
        textView.delegate = self
        textView.linkTextAttributes = [
            .foregroundColor: AppColor.agreementLink,
            .font: UIFont.systemFont(ofSize: 12, weight: .semibold),
        ]
        textView.attributedText = makeAgreementText()

        addSubview(checkButton)
        addSubview(textView)
    }

    private func setupConstraints() {
        checkButton.snp.makeConstraints { make in
            make.leading.top.equalToSuperview()
            make.size.equalTo(18)
        }

        textView.snp.makeConstraints { make in
            make.leading.equalTo(checkButton.snp.trailing).offset(8)
            make.trailing.top.bottom.equalToSuperview()
        }
    }

    private func updateCheckboxImage() {
        let imageName = isChecked ? "icon_cb_privacy_selected" : "icon_cb_privacy_unselect"
        checkButton.setImage(UIImage(named: imageName), for: .normal)
    }

    private func makeAgreementText() -> NSAttributedString {
        let result = NSMutableAttributedString()
        let normalAttributes: [NSAttributedString.Key: Any] = [
            .font: UIFont.systemFont(ofSize: 12),
            .foregroundColor: AppColor.text666,
        ]
        let linkFont = UIFont.systemFont(ofSize: 12, weight: .semibold)

        result.append(NSAttributedString(string: "已阅读并同意", attributes: normalAttributes))
        result.append(NSAttributedString(string: "《用户协议》", attributes: [
            .font: linkFont,
            .foregroundColor: AppColor.agreementLink,
            .link: "tos",
        ]))
        result.append(NSAttributedString(string: "与", attributes: normalAttributes))
        result.append(NSAttributedString(string: "《隐私政策》", attributes: [
            .font: linkFont,
            .foregroundColor: AppColor.agreementLink,
            .link: "privacy",
        ]))
        return result
    }

    @objc private func checkButtonTapped() {
        onCheckedChange?()
    }

    func textView(
        _ textView: UITextView,
        shouldInteractWith URL: URL,
        in characterRange: NSRange,
        interaction: UITextItemInteraction
    ) -> Bool {
        switch URL.absoluteString {
        case "tos":
            onUserAgreementTap?()
        case "privacy":
            onPrivacyPolicyTap?()
        default:
            break
        }
        return false
    }
}