#!/usr/bin/swift
// 🤖 Regenerates a Mac dev-alt icon set from the canonical app icon: the
// SAME purple "11" tile, hue-rotated so a dev build is unmistakable in the
// Dock without inventing a new mark (CLAUDE.md: never hand-roll a
// substitute glyph). Two variants: "dev" (orange, the default) and "live"
// (green — the convention for a dev build aimed at PRODUCTION home, so two
// running alts with different aims never share an icon). Run from the repo
// root:
//
//   swift tools/make-dev-icon.swift          # AppIconDev (orange)
//   swift tools/make-dev-icon.swift live     # AppIconDevLive (green)
//
// Committed output; re-run only if the canonical icon changes.
import AppKit
import CoreImage

// Purple sits ~253°; orange ~30° (-220°), green ~130° (-123°). White and
// near-white (the "11") are hue-less, so they ride through untouched.
let variants: [String: (set: String, angle: Double)] = [
    "dev": ("AppIconDev", -220.0),
    "live": ("AppIconDevLive", -123.0),
]
let name = CommandLine.arguments.count > 1 ? CommandLine.arguments[1] : "dev"
guard let variant = variants[name] else {
    fatalError("unknown variant \(name) — expected: \(variants.keys.sorted().joined(separator: ", "))")
}

let src = "ios/LChatMac/Assets.xcassets/AppIcon.appiconset/icon_1024.png"
let outDir = "ios/LChatMac/Assets.xcassets/\(variant.set).appiconset"

guard let image = CIImage(contentsOf: URL(fileURLWithPath: src)) else {
    fatalError("can't read \(src) — run from the repo root")
}

let hue = CIFilter(name: "CIHueAdjust", parameters: [
    kCIInputImageKey: image,
    kCIInputAngleKey: NSNumber(value: variant.angle * .pi / 180.0),
])!
guard let tinted = hue.outputImage else { fatalError("hue adjust failed") }

let ctx = CIContext()
guard let full = ctx.createCGImage(tinted, from: tinted.extent) else {
    fatalError("render failed")
}

try? FileManager.default.createDirectory(atPath: outDir, withIntermediateDirectories: true)

for size in [16, 32, 64, 128, 256, 512, 1024] {
    let rep = NSBitmapImageRep(bitmapDataPlanes: nil, pixelsWide: size, pixelsHigh: size,
                               bitsPerSample: 8, samplesPerPixel: 4, hasAlpha: true,
                               isPlanar: false, colorSpaceName: .deviceRGB,
                               bytesPerRow: 0, bitsPerPixel: 0)!
    let nsCtx = NSGraphicsContext(bitmapImageRep: rep)!
    NSGraphicsContext.saveGraphicsState()
    NSGraphicsContext.current = nsCtx
    nsCtx.cgContext.interpolationQuality = .high
    nsCtx.cgContext.draw(full, in: CGRect(x: 0, y: 0, width: size, height: size))
    NSGraphicsContext.restoreGraphicsState()
    let png = rep.representation(using: .png, properties: [:])!
    try! png.write(to: URL(fileURLWithPath: "\(outDir)/icon_\(size).png"))
    print("wrote \(outDir)/icon_\(size).png")
}

let contents = """
{
  "images" : [
    { "idiom" : "mac", "size" : "16x16", "scale" : "1x", "filename" : "icon_16.png" },
    { "idiom" : "mac", "size" : "16x16", "scale" : "2x", "filename" : "icon_32.png" },
    { "idiom" : "mac", "size" : "32x32", "scale" : "1x", "filename" : "icon_32.png" },
    { "idiom" : "mac", "size" : "32x32", "scale" : "2x", "filename" : "icon_64.png" },
    { "idiom" : "mac", "size" : "128x128", "scale" : "1x", "filename" : "icon_128.png" },
    { "idiom" : "mac", "size" : "128x128", "scale" : "2x", "filename" : "icon_256.png" },
    { "idiom" : "mac", "size" : "256x256", "scale" : "1x", "filename" : "icon_256.png" },
    { "idiom" : "mac", "size" : "256x256", "scale" : "2x", "filename" : "icon_512.png" },
    { "idiom" : "mac", "size" : "512x512", "scale" : "1x", "filename" : "icon_512.png" },
    { "idiom" : "mac", "size" : "512x512", "scale" : "2x", "filename" : "icon_1024.png" }
  ],
  "info" : { "version" : 1, "author" : "xcode" }
}
"""
try! contents.write(toFile: "\(outDir)/Contents.json", atomically: true, encoding: .utf8)
print("wrote \(outDir)/Contents.json")