import SwiftUI
import AppKit
import SwiftTerm

/// Offizielle Dracula-Palette (https://draculatheme.com/contribute).
enum Dracula {
    static let background = SwiftUI.Color(hex: "282A36")
    static let currentLine = SwiftUI.Color(hex: "44475A")
    static let foreground = SwiftUI.Color(hex: "F8F8F2")
    static let comment = SwiftUI.Color(hex: "6272A4")
    static let cyan = SwiftUI.Color(hex: "8BE9FD")
    static let green = SwiftUI.Color(hex: "50FA7B")
    static let orange = SwiftUI.Color(hex: "FFB86C")
    static let pink = SwiftUI.Color(hex: "FF79C6")
    static let purple = SwiftUI.Color(hex: "BD93F9")
    static let red = SwiftUI.Color(hex: "FF5555")
    static let yellow = SwiftUI.Color(hex: "F1FA8C")

    /// ANSI-Index 0-15 -> Dracula-Farbe.
    static func color(for index: Int?) -> SwiftUI.Color {
        guard let index else { return foreground }
        switch index {
        case 0: return SwiftUI.Color(hex: "21222C")
        case 1: return red
        case 2: return green
        case 3: return yellow
        case 4: return purple
        case 5: return pink
        case 6: return cyan
        case 7: return foreground
        case 8: return comment
        case 9: return SwiftUI.Color(hex: "FF6E6E")
        case 10: return SwiftUI.Color(hex: "69FF94")
        case 11: return SwiftUI.Color(hex: "FFFFA5")
        case 12: return SwiftUI.Color(hex: "D6ACFF")
        case 13: return SwiftUI.Color(hex: "FF92DF")
        case 14: return SwiftUI.Color(hex: "A4FFFF")
        default: return SwiftUI.Color(hex: "FFFFFF")
        }
    }

    static func nsColor(for index: Int?) -> NSColor {
        NSColor(color(for: index))
    }

    static let nsBackground = NSColor(SwiftUI.Color(hex: "282A36"))
    static let nsSelection = NSColor(SwiftUI.Color(hex: "44475A"))

    /// 16 ANSI colors for the terminal emulator (SwiftTerm palette).
    static var ansiPalette: [SwiftTerm.Color] {
        ["21222C", "FF5555", "50FA7B", "F1FA8C", "BD93F9", "FF79C6", "8BE9FD", "F8F8F2",
         "6272A4", "FF6E6E", "69FF94", "FFFFA5", "D6ACFF", "FF92DF", "A4FFFF", "FFFFFF"]
            .compactMap { SwiftTerm.Color.parse("#\($0)") }
    }
}

extension SwiftUI.Color {
    init(hex: String) {
        let clean = hex.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
        var value: UInt64 = 0
        Scanner(string: clean).scanHexInt64(&value)
        let r = Double((value >> 16) & 0xFF) / 255
        let g = Double((value >> 8) & 0xFF) / 255
        let b = Double(value & 0xFF) / 255
        self.init(red: r, green: g, blue: b)
    }
}