//
//  StringExtension.swift
//  SodaLive
//
//  Created by klaus on 2022/06/03.
//

import Foundation

extension Optional where Wrapped == String {
    func isNullOrBlank() -> Bool {
        return self == nil || self!.trimmingCharacters(in: .whitespaces).isEmpty
    }
}

extension String {
    func convertDateFormat(from: String, to: String, locale: Locale? = nil) -> String {
        let fromFormatter = DateFormatter()
        fromFormatter.dateFormat = from
        fromFormatter.timeZone = TimeZone(identifier: TimeZone.current.identifier)
        
        if let locale = locale {
            fromFormatter.locale = locale
        }
        
        if let date = fromFormatter.date(from: self) {
            return date.convertDateFormat(dateFormat: to)
        } else {
            return self
        }
    }
    
    func substring(from: Int, to: Int) -> String {
        guard from < count, to >= 0, to - from >= 0 else {
            return ""
        }
        
        // Index 값 획득
        let startIndex = index(self.startIndex, offsetBy: from)
        let endIndex = index(self.startIndex, offsetBy: to + 1) // '+1'이 있는 이유: endIndex는 문자열의 마지막 그 다음을 가리키기 때문
        
        // 파싱
        return String(self[startIndex ..< endIndex])
        
        // 출처 - https://ios-development.tistory.com/379
    }
    
    func formatCurrency(currencyCode: String, locale: Locale = .current) -> String {
        let formatter = NumberFormatter()
        formatter.numberStyle = .currency
        formatter.locale = locale
        formatter.currencyCode = currencyCode
        
        let dec = NSDecimalNumber(string: self)
        return formatter.string(from: dec) ?? "\(currencyCode) \(self)"
    }
    
    func parseUtcIsoLocalDateTime() -> [String: String] {
        // 1. 서버에서 내려온 포맷: "yyyy-MM-dd'T'HH:mm:ss"
        let utcFormatter = DateFormatter()
        utcFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss"
        utcFormatter.locale = Locale.current
        utcFormatter.timeZone = TimeZone(abbreviation: "UTC")
        
        // 2. 문자열 → Date 객체
        guard let date = utcFormatter.date(from: self) else {
            return [:]  // 파싱 실패 시 빈 딕셔너리 반환
        }
        
        // 3~6. 출력용 Formatter (로컬 시간 기준)
        let localFormatter = DateFormatter()
        localFormatter.locale = Locale.autoupdatingCurrent
        localFormatter.timeZone = TimeZone.current
        
        // 3. 월 (1~12)
        localFormatter.dateFormat = "M"
        let month = localFormatter.string(from: date)
        
        // 4. 일 (1~31)
        localFormatter.dateFormat = "d"
        let day = localFormatter.string(from: date)
        
        // 5. 요일 (예: "Mon", "목")
        localFormatter.dateFormat = "E"
        let dayOfWeek = localFormatter.string(from: date)
        
        // 6. 시간 (예: "AM 05:00")
        localFormatter.dateFormat = "a hh:mm"
        let time = localFormatter.string(from: date)
        
        return [
            "month": month,
            "day": day,
            "dayOfWeek": dayOfWeek,
            "time": time
        ]
    }
}