import SwiftUI
import CoreGraphics

// Hex color helpers shared by the Mac app and the iPhone app.

// Views ask for the same few dozen hex colours on every frame: parse each string once.
private enum HexCache {
    nonisolated(unsafe) static var colors: [String: Color] = [:]
    nonisolated(unsafe) static var cgColors: [String: CGColor] = [:]
    static let lock = NSLock()
}

// MARK: - Color from hex string

extension Color {
    init(hex: String) {
        HexCache.lock.lock()
        if let c = HexCache.colors[hex] { HexCache.lock.unlock(); self = c; return }
        HexCache.lock.unlock()
        let h = hex.trimmingCharacters(in: CharacterSet(charactersIn: "#"))
        let val = UInt64(h, radix: 16) ?? 0
        let r = Double((val >> 16) & 0xFF) / 255
        let g = Double((val >> 8)  & 0xFF) / 255
        let b = Double( val        & 0xFF) / 255
        self.init(red: r, green: g, blue: b)
        HexCache.lock.lock(); HexCache.colors[hex] = self; HexCache.lock.unlock()
    }
}

// MARK: - CGColor from hex string

func cgColorFromHex(_ hex: String) -> CGColor? {
    HexCache.lock.lock()
    if let c = HexCache.cgColors[hex] { HexCache.lock.unlock(); return c }
    HexCache.lock.unlock()
    let h = hex.trimmingCharacters(in: CharacterSet(charactersIn: "#"))
    guard let val = UInt64(h, radix: 16) else { return nil }
    let r = CGFloat((val >> 16) & 0xFF) / 255
    let g = CGFloat((val >> 8)  & 0xFF) / 255
    let b = CGFloat( val        & 0xFF) / 255
    let c = CGColor(red: r, green: g, blue: b, alpha: 1)
    HexCache.lock.lock(); HexCache.cgColors[hex] = c; HexCache.lock.unlock()
    return c
}

extension CGColor {
    static func from(_ hex: String) -> CGColor {
        cgColorFromHex(hex) ?? CGColor(gray: 0.5, alpha: 1)
    }
}

#if !os(macOS)
// CGColor.white / .black / .clear only exist on macOS; BotEngine uses them.
extension CGColor {
    static var white: CGColor { CGColor(gray: 1, alpha: 1) }
    static var black: CGColor { CGColor(gray: 0, alpha: 1) }
    static var clear: CGColor { CGColor(gray: 0, alpha: 0) }
}
#endif