//
//  NRNovelReadSetManager.swift
//  ReaderHive
//
//  Created by 澜声世纪 on 2025/11/27.
//

import UIKit

class NRNovelReadSetManager: NSObject {
    
    static let manager = NRNovelReadSetManager()
    
    
    private(set) var readSet: NRNovelReadSet = UserDefaults.nr_object(forKey: kNRNovelReadSetDefaultsKey, as: NRNovelReadSet.self) ?? NRNovelReadSet()
    
    ///动画时间
    let animateDuration = 0.2
    
    let topViewHeight: CGFloat = UIScreen.navBarHeight
    let bottomViewHeight: CGFloat = UIScreen.safeBottom + 105 + 52
    let contentTopViewHeight: CGFloat = UIScreen.navBarHeight
    let contentBottomViewHeight: CGFloat = UIScreen.safeBottom + 30
    ///阅读区域
    var readRect: CGRect {
        return .init(x: 16, y: 0, width: UIScreen.width - 32, height: UIScreen.height - contentTopViewHeight - contentBottomViewHeight)
    }
    
    var currentTheme: NRReadTheme {
        if isNight {
            return nightTheme
        } else {        
            return NRReadTheme.theme(for: readSet.theme)
        }
    }
    
    ///夜间模式主题
    lazy var nightTheme: NRReadTheme = {
        return NRReadTheme(type: .theme1, backgroundColor: ._24232_B, textColor: ._9_D_9_CA_8, statusBarStyle: .default)
    }()
    
    ///行间距
    var lineSpacing: CGFloat {
        switch self.readSet.lineSpacingType {
        case .small:
            return 8
        case .standard:
            return 10
        case .large:
            return 12
        }
    }
    
    ///段落间距
    var paragraphSpacing: CGFloat {
        switch self.readSet.paragraphSpacingType {
        case .small:
            return 15
        case .standard:
            return 17
        case .large:
            return 19
        }
    }
    
    var textColor: UIColor {
        return currentTheme.textColor
    }
    
    var textFont: UIFont {
        return UIFont.font(ofSize: self.readSet.fontSize, weight: .regular)
    }
    
    var titleFont: UIFont {
        return UIFont.font(ofSize: self.readSet.fontSize + 10, weight: .semibold)
    }
    
    let miniFontSize: CGFloat = 12
    let maxFontSize: CGFloat = 24
    
    var isNight: Bool {
        return readSet.isNight
    }
    
    var brightness: CGFloat {
        if let brightness = self.readSet.brightness {
            return brightness
        } else {
            return UIScreen.main.brightness
        }
    }
    
    func updateTheme(type: NRReadThemeType) {
        readSet.theme = type
        readSet.isNight = false
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
        NotificationCenter.default.post(name: NRNovelReadSetManager.didChangedThemeNotification, object: nil)
    }
    
    func updateIsNight(isNight: Bool) {
        readSet.isNight = isNight
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
        NotificationCenter.default.post(name: NRNovelReadSetManager.didChangedThemeNotification, object: nil)
    }
    
    func updateLineSpacing(type: NRNovelReadSet.SpacingType) {
        readSet.lineSpacingType = type
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
        NotificationCenter.default.post(name: NRNovelReadSetManager.didChangedTextLayoutNotification, object: nil)
    }
    
    func updateParagraphSpacing(type: NRNovelReadSet.SpacingType) {
        readSet.paragraphSpacingType = type
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
        NotificationCenter.default.post(name: NRNovelReadSetManager.didChangedTextLayoutNotification, object: nil)
    }
    
    func updateFontSize(size: CGFloat) {
        readSet.fontSize = size
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
        NotificationCenter.default.post(name: NRNovelReadSetManager.didChangedTextLayoutNotification, object: nil)
    }
    
    func updateBrightness(value: CGFloat) {
        readSet.brightness = value
        UIScreen.main.brightness = value
        UserDefaults.nr_setObject(readSet, forKey: kNRNovelReadSetDefaultsKey)
    }
    
    /// 字体属性
    /// isPaging: 为YES的时候只需要返回跟分页相关的属性即可 (原因:包含UIColor,小数点相关的...不可返回,因为无法进行比较)
    func attributes(isTitle:Bool, isPageing:Bool = false) ->[NSAttributedString.Key:Any] {
        
        // 段落配置
        let paragraphStyle = NSMutableParagraphStyle()
        
        // 当前行间距(lineSpacing)的倍数(可根据字体大小变化修改倍数)
        paragraphStyle.lineHeightMultiple = 1.0
        
        if isTitle {
            
            // 行间距
            paragraphStyle.lineSpacing = 0
            
            // 段间距
            paragraphStyle.paragraphSpacing = 0
            
            // 对其
            paragraphStyle.alignment = .center
            
        }else{
            
            // 行间距
            paragraphStyle.lineSpacing = lineSpacing
            
            // 换行模式（避免每页尾部留空白）
//            paragraphStyle.lineBreakMode = .byCharWrapping
            paragraphStyle.lineBreakMode = .byWordWrapping
            
            // 段间距
            paragraphStyle.paragraphSpacing = paragraphSpacing
            
            // 对其
            paragraphStyle.alignment = .justified
        }
        
        let font: UIFont
        
        if isTitle {
            font = self.titleFont
        } else {
            font = self.textFont
        }
        
        if isPageing {
            
            return [.font: font, .paragraphStyle: paragraphStyle]
            
        }else{
            
            return [.foregroundColor: textColor, .font: font, .paragraphStyle: paragraphStyle]
        }
    }
    
    func emptyAttributes() -> [NSAttributedString.Key:Any] {
        // 段落配置
        let paragraphStyle = NSMutableParagraphStyle()
        
        // 当前行间距(lineSpacing)的倍数(可根据字体大小变化修改倍数)
        paragraphStyle.lineHeightMultiple = 1.0
        
        // 行间距
        paragraphStyle.lineSpacing = 0
        
        // 段间距
        paragraphStyle.paragraphSpacing = 0
        
        // 对其
        paragraphStyle.alignment = .center
        
        return [.font: self.textFont, .paragraphStyle: paragraphStyle]

    }
    
}


extension NRNovelReadSetManager {
    ///主题色发生变化
    static let didChangedThemeNotification = Notification.Name(rawValue: "NRNovelReadSetManager.didChangedThemeNotification")
    
    ///文本布局发生变化 （字体，行间距，段落间距等）
    static let didChangedTextLayoutNotification = Notification.Name(rawValue: "NRNovelReadSetManager.didChangedTextLayoutNotification")
    
}