//
//  EPPolicyLabel.swift
//  YuMi
//
//  Created by AI on 2025-01-27.
//

import UIKit

class EPPolicyLabel: UILabel {
    
    // MARK: - Properties
    
    var onUserAgreementTapped: (() -> Void)?
    var onPrivacyPolicyTapped: (() -> Void)?
    
    // MARK: - Initialization
    
    override init(frame: CGRect) {
        super.init(frame: frame)
        setup()
    }
    
    required init?(coder: NSCoder) {
        super.init(coder: coder)
        setup()
    }
    
    // MARK: - Setup
    
    private func setup() {
        numberOfLines = 0
        isUserInteractionEnabled = true
        
        // 使用 YMLocalizedString 获取文案
        let fullText = YMLocalizedString("XPLoginViewController6")
        let userAgreementText = YMLocalizedString("XPLoginViewController7")
        let privacyPolicyText = YMLocalizedString("XPLoginViewController9")
        
        let attributedString = NSMutableAttributedString(string: fullText)
        attributedString.addAttribute(NSAttributedString.Key.foregroundColor, 
                                     value: UIColor.darkGray, 
                                     range: NSRange(location: 0, length: fullText.count))
        attributedString.addAttribute(NSAttributedString.Key.font, 
                                     value: UIFont.systemFont(ofSize: 12), 
                                     range: NSRange(location: 0, length: fullText.count))
        
        // 高亮用户协议（蓝色）
        if let userRange = fullText.range(of: userAgreementText) {
            let nsRange = NSRange(userRange, in: fullText)
            attributedString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemBlue, range: nsRange)
            attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: nsRange)
        }
        
        // 高亮隐私政策（蓝色）
        if let privacyRange = fullText.range(of: privacyPolicyText) {
            let nsRange = NSRange(privacyRange, in: fullText)
            attributedString.addAttribute(NSAttributedString.Key.foregroundColor, value: UIColor.systemBlue, range: nsRange)
            attributedString.addAttribute(NSAttributedString.Key.underlineStyle, value: NSUnderlineStyle.single.rawValue, range: nsRange)
        }
        
        attributedText = attributedString
        
        // 添加点击手势
        let tapGesture = UITapGestureRecognizer(target: self, action: #selector(handleTap(_:)))
        addGestureRecognizer(tapGesture)
    }
    
    // MARK: - Actions
    
    @objc private func handleTap(_ gesture: UITapGestureRecognizer) {
        guard let attributedText = self.attributedText else {
            print("[EPPolicyLabel] No attributed text")
            return
        }
        
        let text = attributedText.string
        let userAgreementText = YMLocalizedString("XPLoginViewController7")
        let privacyPolicyText = YMLocalizedString("XPLoginViewController9")
        
        print("[EPPolicyLabel] Tap detected, text: \(text)")
        
        let layoutManager = NSLayoutManager()
        let textContainer = NSTextContainer(size: bounds.size)
        let textStorage = NSTextStorage(attributedString: attributedText)
        
        layoutManager.addTextContainer(textContainer)
        textStorage.addLayoutManager(layoutManager)
        
        textContainer.lineFragmentPadding = 0
        textContainer.maximumNumberOfLines = numberOfLines
        textContainer.lineBreakMode = lineBreakMode
        
        let locationOfTouchInLabel = gesture.location(in: self)
        let textBoundingBox = layoutManager.usedRect(for: textContainer)
        
        // 根据 textAlignment 计算偏移
        var textContainerOffset = CGPoint.zero
        switch textAlignment {
        case .left, .natural, .justified:
            textContainerOffset = CGPoint(x: 0, y: (bounds.height - textBoundingBox.height) / 2)
        case .center:
            textContainerOffset = CGPoint(x: (bounds.width - textBoundingBox.width) / 2,
                                         y: (bounds.height - textBoundingBox.height) / 2)
        case .right:
            textContainerOffset = CGPoint(x: bounds.width - textBoundingBox.width,
                                         y: (bounds.height - textBoundingBox.height) / 2)
        @unknown default:
            textContainerOffset = CGPoint(x: 0, y: (bounds.height - textBoundingBox.height) / 2)
        }
        
        let locationOfTouchInTextContainer = CGPoint(x: locationOfTouchInLabel.x - textContainerOffset.x,
                                                     y: locationOfTouchInLabel.y - textContainerOffset.y)
        
        // 确保点击在文本区域内
        guard textBoundingBox.contains(locationOfTouchInTextContainer) else {
            print("[EPPolicyLabel] Tap outside text bounds")
            return
        }
        
        let indexOfCharacter = layoutManager.characterIndex(for: locationOfTouchInTextContainer,
                                                            in: textContainer,
                                                            fractionOfDistanceBetweenInsertionPoints: nil)
        
        print("[EPPolicyLabel] Character index: \(indexOfCharacter)")
        
        // 检查点击位置
        if let userRange = text.range(of: userAgreementText) {
            let nsRange = NSRange(userRange, in: text)
            print("[EPPolicyLabel] User agreement range: \(nsRange)")
            if NSLocationInRange(indexOfCharacter, nsRange) {
                print("[EPPolicyLabel] User agreement tapped!")
                onUserAgreementTapped?()
                return
            }
        }
        
        if let privacyRange = text.range(of: privacyPolicyText) {
            let nsRange = NSRange(privacyRange, in: text)
            print("[EPPolicyLabel] Privacy policy range: \(nsRange)")
            if NSLocationInRange(indexOfCharacter, nsRange) {
                print("[EPPolicyLabel] Privacy policy tapped!")
                onPrivacyPolicyTapped?()
                return
            }
        }
        
        print("[EPPolicyLabel] No link tapped")
    }
}