import Foundation

/// Factory-default UUIDs that indicate an unconfigured beacon
/// Matches Android BeaconBanList.kt exactly
enum BeaconBanList {

    /// UUID prefixes (first 8 hex chars) that are factory defaults
    /// Key = uppercase prefix, Value = reason
    private static let bannedPrefixes: [String: String] = [
        "E2C56DB5": "Apple AirLocate / Minew factory default",
        "F7826DA6": "Kontakt.io factory default",
        "2F234454": "Radius Networks default",
        "B9407F30": "Estimote factory default",
        "FDA50693": "Generic bulk / Feasycom factory default",
        "74278BDA": "Generic bulk manufacturer default",
        "8492E75F": "Generic bulk manufacturer default",
        "A0B13730": "Generic bulk manufacturer default",
        "EBEFD083": "JAALEE factory default",
        "B5B182C7": "April Brother factory default",
        "00000000": "Unconfigured / zeroed UUID",
        "FFFFFFFF": "Unconfigured / max UUID",
    ]

    /// Full UUIDs that are known defaults (exact match on 32-char uppercase hex, no dashes)
    private static let bannedFullUUIDs: [String: String] = [
        "E2C56DB5DFFB48D2B060D0F5A71096E0": "Apple AirLocate sample UUID",
        "B9407F30F5F8466EAFF925556B57FE6D": "Estimote factory default",
        "2F234454CF6D4A0FADF2F4911BA9FFA6": "Radius Networks default",
        "FDA50693A4E24FB1AFCFC6EB07647825": "Generic Chinese bulk default",
        "74278BDAB64445208F0C720EAF059935": "Generic bulk default",
        "00000000000000000000000000000000": "Zeroed UUID — unconfigured hardware",
    ]

    /// Check if a UUID is a factory default
    static func isBanned(_ uuid: String) -> Bool {
        let normalized = uuid.normalizedUUID

        // Check full UUID match
        if bannedFullUUIDs[normalized] != nil { return true }

        // Check prefix match
        let prefix = String(normalized.prefix(8))
        return bannedPrefixes[prefix] != nil
    }

    /// Get the reason a UUID is banned, or nil if not banned
    static func getBanReason(_ uuid: String) -> String? {
        let normalized = uuid.normalizedUUID

        // Check full UUID match first
        if let reason = bannedFullUUIDs[normalized] { return reason }

        // Check prefix
        let prefix = String(normalized.prefix(8))
        return bannedPrefixes[prefix]
    }
}