import SwiftUI

/// 设计 tokens（颜色 / 渐变 / 间距 / 圆角），对应 Android DesignSystem。
public enum DS {
    public enum Color {
        public static let accent = SwiftUI.Color.accentColor
        public static let success = SwiftUI.Color.green
        public static let danger = SwiftUI.Color(hex: 0xC0392B)
        public static let warning = SwiftUI.Color.orange

        // 品牌色（对齐「明缘云道场」小程序 / android-client designsystem）
        public static let brandDark = SwiftUI.Color(hex: 0x2C1810)
        public static let brandGold = SwiftUI.Color(hex: 0xC67B30)
        public static let brandPaper = SwiftUI.Color(hex: 0xFDFBF7)
        public static let planBackground = SwiftUI.Color(hex: 0xF6F2EC)
        public static let brandBrown = SwiftUI.Color(hex: 0x5A4A3A)
        public static let brandMuted = SwiftUI.Color(hex: 0x8B7A6A)
        public static let brandLightAmber = SwiftUI.Color(hex: 0xE3B37C)
        public static let amberMid = SwiftUI.Color(hex: 0xE4A05E)
        public static let brandChip = SwiftUI.Color(hex: 0xF6EFE6)
        public static let brandCream = SwiftUI.Color(hex: 0xE8DCCB)
        public static let faintText = SwiftUI.Color(hex: 0xB6A996)
        public static let disabled = SwiftUI.Color(hex: 0xD8C7B4)

        // 打卡状态色
        public static let statusNormal = SwiftUI.Color(hex: 0x2E7D32)
        public static let statusNormalBright = SwiftUI.Color(hex: 0x43A047)
        public static let statusLate = SwiftUI.Color(hex: 0xC67B30)
        public static let statusLeave = SwiftUI.Color(hex: 0x3A7BD5)
        public static let statusEarlyLeave = SwiftUI.Color(hex: 0x8B7A6A)
        public static let statusAbsent = SwiftUI.Color(hex: 0xC0392B)
        public static let dangerBright = SwiftUI.Color(hex: 0xE5736C)

        // 完成 / 未完成底色
        public static let fillDone = SwiftUI.Color(hex: 0xE8F4EB)
        public static let fillUndone = SwiftUI.Color(hex: 0xFFF3E6)
    }

    public enum Gradient {
        /// 首页顶部深咖啡色渐变（135°）。
        public static let hero = LinearGradient(
            colors: [
                SwiftUI.Color(hex: 0x2C1810),
                SwiftUI.Color(hex: 0x4A2B1D),
                SwiftUI.Color(hex: 0x6B3F24),
            ],
            startPoint: .topLeading,
            endPoint: .bottomTrailing
        )

        public static let amber = LinearGradient(
            colors: [SwiftUI.Color(hex: 0xC67B30), SwiftUI.Color(hex: 0xE4A05E)],
            startPoint: .top,
            endPoint: .bottom
        )

        public static let avatar = LinearGradient(
            colors: [SwiftUI.Color(hex: 0xC67B30), SwiftUI.Color(hex: 0xE3B37C)],
            startPoint: .top,
            endPoint: .bottom
        )

        public static let groupTile = LinearGradient(
            colors: [SwiftUI.Color(hex: 0xF3E3CF), SwiftUI.Color(hex: 0xFBE7D1)],
            startPoint: .topLeading,
            endPoint: .bottomTrailing
        )
    }

    public enum Spacing {
        public static let xs: CGFloat = 4
        public static let sm: CGFloat = 8
        public static let md: CGFloat = 16
        public static let lg: CGFloat = 24
        public static let xl: CGFloat = 32
    }

    public enum Radius {
        public static let sm: CGFloat = 8
        public static let md: CGFloat = 12
        public static let lg: CGFloat = 16
    }
}

extension SwiftUI.Color {
    /// 从 0xRRGGBB 十六进制值构造颜色。
    init(hex: UInt32, alpha: Double = 1.0) {
        self.init(
            .sRGB,
            red: Double((hex >> 16) & 0xFF) / 255.0,
            green: Double((hex >> 8) & 0xFF) / 255.0,
            blue: Double(hex & 0xFF) / 255.0,
            opacity: alpha
        )
    }
}