// A stable, well-distributed color per profile name, shared by the menu
// bar dots and the Manage window's profile list so the same name always
// reads as the same color everywhere.
import AppKit

enum ProfileColor {
    // FNV-1a: a proper avalanching hash, not a preset-palette lookup — the
    // full hue wheel is available, and single-character name edits (e.g.
    // "personal" vs "personal2") land on unrelated hues instead of an
    // adjacent bucket the way a plain sum-of-scalars hash mod'd into a
    // short color list would.
    private static func fnv1aHash(_ s: String) -> UInt32 {
        var hash: UInt32 = 0x811c_9dc5
        for byte in s.utf8 {
            hash ^= UInt32(byte)
            hash = hash &* 0x0100_0193
        }
        return hash
    }

    static func dotColor(for name: String) -> NSColor {
        let hue = CGFloat(fnv1aHash(name) % 360) / 360.0
        return NSColor(calibratedHue: hue, saturation: 0.65, brightness: 0.9, alpha: 1.0)
    }

    // `dimmed` marks a profile that isn't actually running right now — the
    // colored dot still identifies it, but faded, so "open" vs "known but
    // closed" is visible without reading a tooltip.
    static func dotImage(for name: String, dimmed: Bool = false) -> NSImage {
        let size = NSSize(width: 10, height: 10)
        let image = NSImage(size: size)
        image.lockFocus()
        dotColor(for: name).withAlphaComponent(dimmed ? 0.3 : 1.0).setFill()
        NSBezierPath(ovalIn: NSRect(origin: .zero, size: size)).fill()
        image.unlockFocus()
        image.isTemplate = false
        return image
    }
}