// Renders the CocotteAI app icon (✦ mark on the rose brand background) and writes
// a full .iconset directory. Run on macOS: `swift make-icon.swift <out.iconset>`.
// The shell packager then `iconutil -c icns`s it. Colors match DesignTokens' rose
// accent (r7 #c75872) over the dark canvas (#100c0e).
import AppKit

// Initialize the shared app so AppKit font/graphics services are available in this
// CLI context (no run loop needed — we never call run()).
_ = NSApplication.shared

let outDir = CommandLine.arguments.count > 1 ? CommandLine.arguments[1] : "AppIcon.iconset"
try? FileManager.default.createDirectory(atPath: outDir, withIntermediateDirectories: true)

func color(_ hex: UInt32) -> NSColor {
    NSColor(srgbRed: CGFloat((hex >> 16) & 0xff) / 255,
            green: CGFloat((hex >> 8) & 0xff) / 255,
            blue: CGFloat(hex & 0xff) / 255, alpha: 1)
}

/// Draw the icon at `size` px (square) into a fresh bitmap context and return PNG
/// data. Draws straight into an NSBitmapImageRep context (not NSImage.lockFocus),
/// which is the reliable path in a command-line tool.
func render(_ size: Int) -> Data {
    let s = CGFloat(size)
    guard let rep = NSBitmapImageRep(
        bitmapDataPlanes: nil, pixelsWide: size, pixelsHigh: size,
        bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true, isPlanar: false,
        colorSpaceName: .deviceRGB, bytesPerRow: 0, bitsPerPixel: 0) else {
        fatalError("bitmap alloc failed at \(size)")
    }
    NSGraphicsContext.saveGraphicsState()
    defer { NSGraphicsContext.restoreGraphicsState() }
    NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)

    // Rounded-rect canvas with a subtle rose vertical gradient (macOS Big Sur look:
    // full-bleed rounded square, the system masks corners on display).
    let rect = NSRect(x: 0, y: 0, width: s, height: s)
    let radius = s * 0.22
    let path = NSBezierPath(roundedRect: rect, xRadius: radius, yRadius: radius)
    path.addClip()
    NSGradient(colors: [color(0x1c1619), color(0x100c0e)])?.draw(in: rect, angle: -90)

    // The ✦ mark, rose accent, centered.
    let fontSize = s * 0.62
    let attrs: [NSAttributedString.Key: Any] = [
        .font: NSFont.systemFont(ofSize: fontSize, weight: .semibold),
        .foregroundColor: color(0xc75872),
    ]
    let str = NSAttributedString(string: "✦", attributes: attrs)
    let bounds = str.size()
    str.draw(at: NSPoint(x: (s - bounds.width) / 2, y: (s - bounds.height) / 2))

    guard let png = rep.representation(using: .png, properties: [:]) else {
        fatalError("PNG encode failed at size \(size)")
    }
    return png
}

// Standard macOS iconset matrix.
let specs: [(name: String, size: Int)] = [
    ("icon_16x16", 16), ("icon_16x16@2x", 32),
    ("icon_32x32", 32), ("icon_32x32@2x", 64),
    ("icon_128x128", 128), ("icon_128x128@2x", 256),
    ("icon_256x256", 256), ("icon_256x256@2x", 512),
    ("icon_512x512", 512), ("icon_512x512@2x", 1024),
]
for spec in specs {
    let url = URL(fileURLWithPath: "\(outDir)/\(spec.name).png")
    try! render(spec.size).write(to: url)
}
FileHandle.standardError.write("wrote \(specs.count) icons to \(outDir)\n".data(using: .utf8)!)