import AppKit
import Foundation

let output = URL(fileURLWithPath: CommandLine.arguments.dropFirst().first ?? "dist/GrowthLapse.iconset")
try FileManager.default.createDirectory(at: output, withIntermediateDirectories: true)

struct IconFile {
    let name: String
    let size: Int
}

let files = [
    IconFile(name: "icon_16x16.png", size: 16),
    IconFile(name: "icon_16x16@2x.png", size: 32),
    IconFile(name: "icon_32x32.png", size: 32),
    IconFile(name: "icon_32x32@2x.png", size: 64),
    IconFile(name: "icon_128x128.png", size: 128),
    IconFile(name: "icon_128x128@2x.png", size: 256),
    IconFile(name: "icon_256x256.png", size: 256),
    IconFile(name: "icon_256x256@2x.png", size: 512),
    IconFile(name: "icon_512x512.png", size: 512),
    IconFile(name: "icon_512x512@2x.png", size: 1024),
]

func drawIcon(size: Int) throws -> Data {
    let rep = NSBitmapImageRep(
        bitmapDataPlanes: nil,
        pixelsWide: size,
        pixelsHigh: size,
        bitsPerSample: 8,
        samplesPerPixel: 4,
        hasAlpha: true,
        isPlanar: false,
        colorSpaceName: .deviceRGB,
        bytesPerRow: 0,
        bitsPerPixel: 0
    )!

    NSGraphicsContext.saveGraphicsState()
    NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)
    let scale = CGFloat(size) / 1024
    let canvas = NSRect(x: 0, y: 0, width: CGFloat(size), height: CGFloat(size))
    NSColor.clear.setFill()
    canvas.fill()

    func rect(_ x: CGFloat, _ y: CGFloat, _ w: CGFloat, _ h: CGFloat) -> NSRect {
        NSRect(x: x * scale, y: y * scale, width: w * scale, height: h * scale)
    }

    let bg = NSBezierPath(roundedRect: rect(72, 72, 880, 880), xRadius: 210 * scale, yRadius: 210 * scale)
    bg.addClip()
    let gradient = NSGradient(colors: [
        NSColor(calibratedRed: 0.06, green: 0.35, blue: 0.90, alpha: 1.0),
        NSColor(calibratedRed: 0.10, green: 0.72, blue: 0.58, alpha: 1.0)
    ])!
    gradient.draw(in: canvas, angle: 38)

    NSColor(calibratedWhite: 1.0, alpha: 0.16).setFill()
    NSBezierPath(ovalIn: rect(560, 74, 520, 520)).fill()
    NSBezierPath(ovalIn: rect(-120, 520, 440, 440)).fill()

    NSGraphicsContext.restoreGraphicsState()
    NSGraphicsContext.saveGraphicsState()
    NSGraphicsContext.current = NSGraphicsContext(bitmapImageRep: rep)

    let shadow = NSShadow()
    shadow.shadowColor = NSColor.black.withAlphaComponent(0.24)
    shadow.shadowBlurRadius = 34 * scale
    shadow.shadowOffset = NSSize(width: 0, height: -10 * scale)
    shadow.set()

    for (index, item) in [
        rect(218, 250, 410, 520),
        rect(306, 214, 410, 520),
        rect(394, 178, 410, 520)
    ].enumerated() {
        let frame = NSBezierPath(roundedRect: item, xRadius: 54 * scale, yRadius: 54 * scale)
        NSColor(calibratedWhite: 1, alpha: index == 2 ? 0.95 : 0.46).setFill()
        frame.fill()
        NSColor(calibratedWhite: 1, alpha: 0.95).setStroke()
        frame.lineWidth = 10 * scale
        frame.stroke()
    }

    shadow.shadowColor = .clear
    shadow.set()

    let photo = NSBezierPath(roundedRect: rect(430, 214, 338, 436), xRadius: 36 * scale, yRadius: 36 * scale)
    NSColor(calibratedRed: 0.07, green: 0.16, blue: 0.25, alpha: 1).setFill()
    photo.fill()

    NSColor(calibratedRed: 0.72, green: 0.92, blue: 1.0, alpha: 1).setFill()
    NSBezierPath(ovalIn: rect(552, 438, 94, 94)).fill()
    let body = NSBezierPath(roundedRect: rect(504, 292, 190, 150), xRadius: 82 * scale, yRadius: 82 * scale)
    body.fill()

    NSColor(calibratedWhite: 1, alpha: 0.96).setStroke()
    let curve = NSBezierPath()
    curve.move(to: NSPoint(x: 210 * scale, y: 270 * scale))
    curve.curve(
        to: NSPoint(x: 822 * scale, y: 760 * scale),
        controlPoint1: NSPoint(x: 360 * scale, y: 312 * scale),
        controlPoint2: NSPoint(x: 618 * scale, y: 620 * scale)
    )
    curve.lineWidth = 38 * scale
    curve.lineCapStyle = .round
    curve.stroke()

    for point in [(210, 270), (420, 390), (620, 590), (822, 760)] {
        NSColor(calibratedWhite: 1, alpha: 1).setFill()
        NSBezierPath(ovalIn: rect(CGFloat(point.0 - 34), CGFloat(point.1 - 34), 68, 68)).fill()
        NSColor(calibratedRed: 0.08, green: 0.47, blue: 0.78, alpha: 1).setFill()
        NSBezierPath(ovalIn: rect(CGFloat(point.0 - 18), CGFloat(point.1 - 18), 36, 36)).fill()
    }

    NSGraphicsContext.restoreGraphicsState()

    guard let data = rep.representation(using: .png, properties: [:]) else {
        throw NSError(domain: "GrowthLapseIcon", code: 1)
    }
    return data
}

for file in files {
    let data = try drawIcon(size: file.size)
    try data.write(to: output.appendingPathComponent(file.name))
}