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macos/Sources/PerlinLiveWallpaper/Persistence.swift

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import Foundation

/// Persists the last-applied look (the resolved-preset JSON from the editor) and
/// the active image mask under Application Support, and restores them on launch.
enum Persistence {
    private static func file(_ name: String) -> URL? {
        guard let dir = FileManager.default.urls(for: .applicationSupportDirectory, in: .userDomainMask).first else { return nil }
        let appDir = dir.appendingPathComponent("PerlinLiveWallpaper", isDirectory: true)
        try? FileManager.default.createDirectory(at: appDir, withIntermediateDirectories: true)
        return appDir.appendingPathComponent(name)
    }

    // MARK: Preset (params)

    static func save(json: String) {
        guard let url = file("current.json") else { return }
        try? Data(json.utf8).write(to: url)
    }

    static func load() -> Preset? {
        guard let url = file("current.json"), let data = try? Data(contentsOf: url) else { return nil }
        return try? JSONDecoder().decode(Preset.self, from: data)
    }

    /// The raw current-look JSON (for re-saving as a named custom preset).
    static func loadRaw() -> String? {
        guard let url = file("current.json"), let data = try? Data(contentsOf: url) else { return nil }
        return String(data: data, encoding: .utf8)
    }

    /// Remove any stale mask file from older builds that persisted the mask.
    static func clearLegacyMask() {
        if let url = file("mask.json") { try? FileManager.default.removeItem(at: url) }
    }
}