import UIKit

// MARK: - 阅读器主题

/// EPUB 阅读器主题配置结构体
/// 定义阅读器内容区域和工具栏的颜色方案
/// 内置浅色、深色、黄色、绿色、粉色、蓝色六套预设主题
public struct RDEPUBReaderTheme: Equatable {
    // MARK: 内容区颜色

    /// 内容区域的背景色
    public var contentBackgroundColor: UIColor
    /// 内容区域的正文文字颜色
    public var contentTextColor: UIColor

    // MARK: 工具栏颜色

    /// 工具栏背景色
    public var toolBackgroundColor: UIColor
    /// 工具栏控件文字/图标颜色
    public var toolControlTextColor: UIColor
    /// 工具栏控件未选中状态的边框颜色
    public var toolControlBorderUnselectColor: UIColor
    /// 工具栏中分隔线的颜色
    public var toolLineColor: UIColor

    /// 初始化主题配置
    /// - Parameters:
    ///   - contentBackgroundColor: 内容区背景色
    ///   - contentTextColor: 内容区文字颜色
    ///   - toolBackgroundColor: 工具栏背景色
    ///   - toolControlTextColor: 工具栏控件颜色
    ///   - toolControlBorderUnselectColor: 控件未选中边框色
    ///   - toolLineColor: 分隔线颜色
    public init(
        contentBackgroundColor: UIColor,
        contentTextColor: UIColor,
        toolBackgroundColor: UIColor,
        toolControlTextColor: UIColor,
        toolControlBorderUnselectColor: UIColor,
        toolLineColor: UIColor
    ) {
        self.contentBackgroundColor = contentBackgroundColor
        self.contentTextColor = contentTextColor
        self.toolBackgroundColor = toolBackgroundColor
        self.toolControlTextColor = toolControlTextColor
        self.toolControlBorderUnselectColor = toolControlBorderUnselectColor
        self.toolLineColor = toolLineColor
    }

    // MARK: 内置预设主题

    /// 浅色主题：白底黑字，适合日间阅读
    public static let light = RDEPUBReaderTheme(
        contentBackgroundColor: .white,
        contentTextColor: .black,
        toolBackgroundColor: .white,
        toolControlTextColor: .black,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )

    /// 深色主题：黑底白字，适合夜间阅读
    public static let dark = RDEPUBReaderTheme(
        contentBackgroundColor: .black,
        contentTextColor: .white,
        toolBackgroundColor: .black,
        toolControlTextColor: .white,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )

    /// 黄色护眼主题：暖色调背景，减少蓝光刺激
    public static let yellow = RDEPUBReaderTheme(
        contentBackgroundColor: UIColor(red: 0.89, green: 0.87, blue: 0.79, alpha: 1),
        contentTextColor: .black,
        toolBackgroundColor: UIColor(red: 0.89, green: 0.87, blue: 0.79, alpha: 1),
        toolControlTextColor: .black,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )

    /// 绿色护眼主题：模拟纸质书的柔和绿色背景
    public static let green = RDEPUBReaderTheme(
        contentBackgroundColor: UIColor(red: 0.87, green: 0.91, blue: 0.82, alpha: 1),
        contentTextColor: .black,
        toolBackgroundColor: UIColor(red: 0.87, green: 0.91, blue: 0.82, alpha: 1),
        toolControlTextColor: .black,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )

    /// 粉色主题：柔和粉色背景
    public static let pink = RDEPUBReaderTheme(
        contentBackgroundColor: UIColor(red: 1, green: 0.89, blue: 0.91, alpha: 1),
        contentTextColor: .black,
        toolBackgroundColor: UIColor(red: 1, green: 0.89, blue: 0.91, alpha: 1),
        toolControlTextColor: .black,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )

    /// 蓝色主题：冷色调蓝色背景
    public static let blue = RDEPUBReaderTheme(
        contentBackgroundColor: UIColor(red: 0.8, green: 0.84, blue: 0.89, alpha: 1),
        contentTextColor: .black,
        toolBackgroundColor: UIColor(red: 0.8, green: 0.84, blue: 0.89, alpha: 1),
        toolControlTextColor: .black,
        toolControlBorderUnselectColor: UIColor.lightGray.withAlphaComponent(0.5),
        toolLineColor: UIColor.lightGray.withAlphaComponent(0.5)
    )
}

// MARK: - CSS 颜色转换

extension RDEPUBReaderTheme {
    /// 将内容区背景色转换为 CSS 颜色字符串，注入 EPUB 的 HTML 中
    var themeBackgroundColorCSS: String {
        contentBackgroundColor.ss_cssString
    }

    /// 将内容区文字颜色转换为 CSS 颜色字符串，注入 EPUB 的 HTML 中
    var themeTextColorCSS: String {
        contentTextColor.ss_cssString
    }
}