import Foundation

/// Reads and decrypts the init config file from the app bundle.
/// Looks for xuqm/config.xuqm first, then falls back to any *.xuqmconfig file.
/// This is used by XuqmSDK.autoInitialize() and does NOT depend on XuqmLicenseSDK.
public enum ConfigFileReader {

    public static func read() -> ConfigFileData? {
        guard let url = Bundle.main.url(forResource: "config", withExtension: "xuqm", subdirectory: "xuqm"),
              let encrypted = try? String(contentsOf: url, encoding: .utf8) else {
            // Fallback: try any *.xuqmconfig file
            if let fallbackURL = findConfigFallback(),
               let encrypted = try? String(contentsOf: fallbackURL, encoding: .utf8) {
                return parse(encrypted)
            }
            return nil
        }
        return parse(encrypted)
    }

    static func parse(_ encrypted: String) -> ConfigFileData? {
        guard let json = try? ConfigFileCrypto.decrypt(encrypted),
              let data = json.data(using: .utf8),
              let file = try? JSONDecoder().decode(ConfigFileData.self, from: data) else {
            return nil
        }
        return file
    }

    private static func findConfigFallback() -> URL? {
        guard let resourceURL = Bundle.main.resourceURL else { return nil }
        let xuqmDir = resourceURL.appendingPathComponent("xuqm")
        guard let contents = try? FileManager.default.contentsOfDirectory(at: xuqmDir, includingPropertiesForKeys: nil) else {
            return nil
        }
        return contents.first { $0.pathExtension.lowercased() == "xuqmconfig" }
    }
}