import AppKit

let size = NSSize(width: 1024, height: 1024)
guard let rep = NSBitmapImageRep(
    bitmapDataPlanes: nil, pixelsWide: 1024, pixelsHigh: 1024,
    bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false,
    colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0
) else { exit(1) }

NSGraphicsContext.saveGraphicsState()
NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)
NSGraphicsContext.current?.imageInterpolation = .high

// Dark rounded tile.
let tile = NSBezierPath(roundedRect: NSRect(x: 112, y: 112, width: 800, height: 800), xRadius: 180, yRadius: 180)
let gradient = NSGradient(colors: [
    NSColor(calibratedRed: 0.16, green: 0.17, blue: 0.22, alpha: 1),
    NSColor(calibratedRed: 0.07, green: 0.08, blue: 0.11, alpha: 1),
])!
gradient.draw(in: tile, angle: -90)

// Terminal-style prompt glyph: chevron + cursor block.
NSColor(calibratedRed: 0.40, green: 0.85, blue: 0.55, alpha: 1).setStroke()
let chevron = NSBezierPath()
chevron.move(to: NSPoint(x: 300, y: 640))
chevron.line(to: NSPoint(x: 470, y: 512))
chevron.line(to: NSPoint(x: 300, y: 384))
chevron.lineWidth = 74
chevron.lineCapStyle = .round
chevron.lineJoinStyle = .round
chevron.stroke()

NSColor(calibratedRed: 0.40, green: 0.85, blue: 0.55, alpha: 1).setFill()
let cursor = NSBezierPath(roundedRect: NSRect(x: 560, y: 384, width: 150, height: 84), xRadius: 16, yRadius: 16)
cursor.fill()

NSGraphicsContext.restoreGraphicsState()

guard let data = rep.representation(using: .png, properties: [:]) else { exit(1) }
if CommandLine.arguments.count < 2 { exit(1) }
do {
    try data.write(to: URL(fileURLWithPath: CommandLine.arguments[1]))
} catch {
    exit(1)
}