import AppKit

@MainActor
enum SunsetPalette {
    static let background = NSColor(srgbRed: 0.12, green: 0.09, blue: 0.08, alpha: 0.55)
    static let text = NSColor(srgbRed: 1.00, green: 0.89, blue: 0.71, alpha: 1)
    static let secondaryText = NSColor(srgbRed: 0.85, green: 0.78, blue: 0.65, alpha: 1)
    static let accent = NSColor(srgbRed: 0.95, green: 0.58, blue: 0.23, alpha: 1)
    static let selectionFill = accent.withAlphaComponent(0.12)
    static let selectionBorder = accent.withAlphaComponent(0.30)
    static let ember = NSColor(srgbRed: 0.76, green: 0.27, blue: 0.18, alpha: 1)
}

@MainActor
final class LauncherBackground: NSView {
    private let amber = NSGradient(colors: [
        SunsetPalette.accent.withAlphaComponent(0.18),
        SunsetPalette.accent.withAlphaComponent(0.065),
        SunsetPalette.accent.withAlphaComponent(0),
    ])!
    private let ember = NSGradient(colors: [
        SunsetPalette.ember.withAlphaComponent(0.26),
        SunsetPalette.ember.withAlphaComponent(0.10),
        SunsetPalette.ember.withAlphaComponent(0),
    ])!

    override func hitTest(_ point: NSPoint) -> NSView? { nil }

    override func draw(_ dirtyRect: NSRect) {
        SunsetPalette.background.setFill()
        dirtyRect.fill()
        let upperGlow = NSPoint(x: bounds.width * 0.58, y: bounds.height * 0.94)
        ember.draw(fromCenter: upperGlow, radius: 0, toCenter: upperGlow,
                   radius: bounds.width * 0.40, options: [])
        let lowerGlow = NSPoint(x: bounds.width * 0.88, y: bounds.height * 0.10)
        amber.draw(fromCenter: lowerGlow, radius: 0, toCenter: lowerGlow,
                   radius: bounds.width * 0.55, options: [])
        let leftGlow = NSPoint(x: bounds.width * 0.08, y: bounds.height * 0.65)
        NSGraphicsContext.saveGraphicsState()
        NSGraphicsContext.current?.cgContext.setAlpha(0.45)
        amber.draw(fromCenter: leftGlow, radius: 0, toCenter: leftGlow,
                   radius: bounds.width * 0.32, options: [])
        NSGraphicsContext.restoreGraphicsState()
    }
}