#!/usr/bin/swift
//
//  rasterize-svg.swift
//  Zyquo Cloud
//
//  Author: Simon-Pierre Boucher
//  Mail: contact@spboucher.ai
//
//  Renders an SVG to PNG at a given pixel size using AppKit's native SVG
//  support (CoreSVG) — used because librsvg isn't installed on this machine.
//  Usage: swift rasterize-svg.swift <in.svg> <out.png> <size>
//

import AppKit

let args = CommandLine.arguments
guard args.count == 4, let size = Int(args[3]) else {
    FileHandle.standardError.write(Data("usage: rasterize-svg.swift <in.svg> <out.png> <size>\n".utf8))
    exit(64)
}

guard let image = NSImage(contentsOfFile: args[1]) else {
    FileHandle.standardError.write(Data("error: cannot load \(args[1])\n".utf8))
    exit(1)
}

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

NSGraphicsContext.saveGraphicsState()
NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)
NSGraphicsContext.current?.imageInterpolation = .high
image.draw(
    in: NSRect(x: 0, y: 0, width: pixels, height: pixels),
    from: .zero, operation: .copy, fraction: 1
)
NSGraphicsContext.restoreGraphicsState()

guard let png = rep.representation(using: .png, properties: [:]) else { exit(1) }
try! png.write(to: URL(fileURLWithPath: args[2]))