import Foundation

enum BeaconBanList {

    /// Known default UUID prefixes (first 8 hex chars of the 32-char UUID).
    private static let BANNED_PREFIXES: [String: String] = [
        // Apple AirLocate / Minew factory default
        "E2C56DB5": "Apple AirLocate / Minew factory default",
        // Kontakt.io default
        "F7826DA6": "Kontakt.io factory default",
        // Radius Networks default
        "2F234454": "Radius Networks default",
        // Estimote default
        "B9407F30": "Estimote factory default",
        // Generic Chinese bulk manufacturer defaults (also Feasycom)
        "FDA50693": "Generic bulk / Feasycom factory default",
        "74278BDA": "Generic bulk manufacturer default",
        "8492E75F": "Generic bulk manufacturer default",
        "A0B13730": "Generic bulk manufacturer default",
        // JAALEE default
        "EBEFD083": "JAALEE factory default",
        // April Brother default
        "B5B182C7": "April Brother factory default",
        // BlueCharm / unconfigured
        "00000000": "Unconfigured / zeroed UUID",
        "FFFFFFFF": "Unconfigured / max UUID",
    ]

    /// Full UUIDs that are known defaults (exact match on 32-char uppercase hex).
    private static let BANNED_FULL_UUIDS: [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 \u{2014} unconfigured hardware",
    ]

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

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

        // Check prefix match (first 8 chars)
        let prefix = String(normalized.prefix(8))
        if BANNED_PREFIXES[prefix] != nil { return true }

        return false
    }

    /// 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 = BANNED_FULL_UUIDS[normalized] { return reason }

        // Check prefix
        let prefix = String(normalized.prefix(8))
        if let reason = BANNED_PREFIXES[prefix] { return reason }

        return nil
    }

    /// Format a raw UUID string into standard UUID format with dashes.
    /// Delegates to String.uuidWithDashes (UUIDFormatting.swift).
    static func formatUuid(_ uuid: String) -> String {
        uuid.uuidWithDashes
    }
}