import SwiftUI

// MARK: - Colors

enum AppColors {
    static let primary = Color(hex: "#1E6B43")
    static let secondary = Color(hex: "#2F7C4B")
    static let tertiary = Color(hex: "#8CFF2E")

    static let brandDark = Color(hex: "#1B5C3A")
    static let brandSoft = Color(hex: "#E8F2EC")

    static let backgroundLight = Color(hex: "#F3F5F7")
    static let backgroundDark = Color(hex: "#18230F")
    static let surface = Color(hex: "#FFFFFF")
    static let textPrimary = Color(hex: "#1C1F23")
    static let textInverse = Color(hex: "#FFFFFF")
    static let textMuted = Color(hex: "#7B8794")
}

enum AppDarkColors {
    static let background = Color(hex: "#18230F")
    static let surface = Color(hex: "#FFFFFF", alpha: 0.05)
    static let textPrimary = Color(hex: "#FFFFFF")
    static let textSecondary = Color(hex: "#A3A3A3")
    static let primary = AppColors.primary
    static let secondary = AppColors.secondary
    static let tertiary = AppColors.tertiary
}

// MARK: - Typography

enum AppTypography {
    static let fontFamily = "Plus Jakarta Sans"

    // Avoid applying dynamic weight on custom font descriptors to prevent
    // SwiftUI runtime warnings on some platforms/toolchains.
    static let heading1 = Font.custom(fontFamily, size: 28)
    static let heading25 = Font.custom(fontFamily, size: 25)
    static let heading2 = Font.custom(fontFamily, size: 20)
    static let heading3 = Font.custom(fontFamily, size: 16)
    static let body = Font.custom(fontFamily, size: 16)
    static let button = Font.custom(fontFamily, size: 14)
    static let caption = Font.custom(fontFamily, size: 10)
    static let overline = Font.custom(fontFamily, size: 11)

    static let bodyLineHeight: CGFloat = 1.6
    static let buttonLetterSpacing: CGFloat = 0.08
    static let captionLetterSpacing: CGFloat = 0.12
}

// MARK: - Layout

enum AppLayout {
    static let radiusMD: CGFloat = 12
    static let radiusLG: CGFloat = 16
    static let radiusXL: CGFloat = 24
    static let radiusFull: CGFloat = 9999

    static let spacing: [CGFloat] = [4, 8, 12, 16, 24, 32]
}

// MARK: - Shadow

struct ShadowSpec {
    let color: Color
    let radius: CGFloat
    let y: CGFloat
}

enum AppShadow {
    static let soft = ShadowSpec(color: Color.black.opacity(0.08), radius: 20, y: 6)
    static let glow = ShadowSpec(color: AppColors.tertiary.opacity(0.2), radius: 24, y: 8)
}

// MARK: - Helpers

extension Color {
    init(hex: String, alpha: Double = 1.0) {
        let cleaned = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var int: UInt64 = 0
        Scanner(string: cleaned).scanHexInt64(&int)

        let r, g, b: UInt64
        switch cleaned.count {
        case 6: // RRGGBB
            r = (int >> 16) & 0xFF
            g = (int >> 8) & 0xFF
            b = int & 0xFF
        case 3: // RGB
            r = ((int >> 8) & 0xF) * 17
            g = ((int >> 4) & 0xF) * 17
            b = (int & 0xF) * 17
        default:
            r = 0; g = 0; b = 0
        }

        self.init(.sRGB,
                  red: Double(r) / 255,
                  green: Double(g) / 255,
                  blue: Double(b) / 255,
                  opacity: alpha)
    }
}