import AppKit
import SstUI
import SwiftUI

/// The app icon: a brushed-aluminium plate with a VU meter and the red record lamp, drawn with the design tokens.
/// Canvas is 256 pt; the macOS icon grid puts the plate at 206 pt with a 46 pt corner radius.
struct IconView: View {
    static let canvas: CGFloat = 256
    private let plate: CGFloat = 206
    private let corner: CGFloat = 46

    var body: some View {
        ZStack {
            BrushedBackground()
                .frame(width: plate, height: plate)
                .clipShape(RoundedRectangle(cornerRadius: corner, style: .continuous))
                .overlay(
                    RoundedRectangle(cornerRadius: corner, style: .continuous)
                        .strokeBorder(Palette.lineSeamDark, lineWidth: Border.hairline))
                .shadow(color: .black.opacity(Opacity.mark), radius: Space.s3, y: Space.s2)

            VStack(spacing: Space.s5) {
                VUMeterView(levelDbfs: -26, isActive: true, brand: "", initialFraction: 0.62)
                    .frame(width: 150)
                HStack(spacing: Space.s4) {
                    LampView(isOn: true, large: true).scaleEffect(1.5)
                    SilkLabel("REC", style: Typography.heading)
                }
            }
            .offset(y: Space.s2)
        }
        .frame(width: Self.canvas, height: Self.canvas)
        .environment(\.colorScheme, .light)
    }
}

@main
@MainActor
struct IconMaker {
    static func main() {
        guard CommandLine.arguments.count > 1 else {
            print("usage: SstIcon <output-folder.iconset>")
            exit(2)
        }
        let folder = URL(fileURLWithPath: CommandLine.arguments[1], isDirectory: true)
        try? FileManager.default.createDirectory(at: folder, withIntermediateDirectories: true)

        // (file name, pixel size) as iconutil expects them
        let outputs: [(String, CGFloat)] = [
            ("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 (name, pixels) in outputs {
            let renderer = ImageRenderer(content: IconView())
            renderer.scale = pixels / IconView.canvas
            guard let tiff = renderer.nsImage?.tiffRepresentation,
                  let png = NSBitmapImageRep(data: tiff)?.representation(using: .png, properties: [:])
            else {
                print("kon \(name) niet renderen")
                exit(1)
            }
            try? png.write(to: folder.appending(path: "\(name).png"))
        }
        print("iconset geschreven naar \(folder.path)")
    }
}