//
//  SDLUtil.swift
//  punchnet
//
//  Created by 安礼成 on 2026/3/9.
//
import Foundation
import CommonCrypto

struct SDLUtil {
    enum ContactType {
        case phone
        case email
        case invalid
    }
    
    static func hmacMD5(key: String, data: String) -> String {
        let keyData = key.data(using: .utf8)!
        let dataData = data.data(using: .utf8)!

        var digest = [UInt8](repeating: 0, count: Int(CC_MD5_DIGEST_LENGTH))
        
        keyData.withUnsafeBytes { keyBytes in
            dataData.withUnsafeBytes { dataBytes in
                CCHmac(
                    CCHmacAlgorithm(kCCHmacAlgMD5),
                    keyBytes.baseAddress!,
                    keyBytes.count,
                    dataBytes.baseAddress!,
                    dataBytes.count,
                    &digest
                )
            }
        }

        return digest.map { String(format: "%02x", $0) }.joined()
        
    }
    
    static func isValidIdentifyContact(_ input: String) -> Bool {
        switch identifyContact(input) {
        case .email, .phone:
            true
        default:
            false
        }
    }

    static func identifyContact(_ input: String) -> ContactType {
        let trimmed = input.trimmingCharacters(in: .whitespacesAndNewlines)
        // 手机号正则（中国手机号为例，以 1 开头，11 位数字）
        let phoneRegex = /^1[3-9][0-9]{9}$/
        // 邮箱正则
        let emailRegex = /^[A-Z0-9a-z._%+-]+@[A-Za-z0-9.-]+\.[A-Za-z]{2,64}$/
        if trimmed.wholeMatch(of: phoneRegex) != nil {
            return .phone
        } else if trimmed.wholeMatch(of: emailRegex) != nil {
            return .email
        } else {
            return .invalid
        }
    }
    
}