//
//  Formatters.swift
//  TournamentStats
//
//  Created by Laurent Morvillier on 03/06/2019.
//  Copyright © 2019 Stax River. All rights reserved.
//

import Foundation

extension Locale {
    
    func countryCode(from countryName: String) -> String? {
        return NSLocale.isoCountryCodes.first { (code) -> Bool in
            let name = self.localizedString(forRegionCode: code)
            return name == countryName
        }
    }
    
    func flagoji(from countryName: String) -> String? {
        
        var adaptedCountryName = countryName
        switch countryName {
        case "Russian Federation":
            adaptedCountryName = "Russia"
        case "China":
            adaptedCountryName = "China mainland"
        default:
            break
        }
        
        if let countryCode = self.countryCode(from: adaptedCountryName) {
            let base : UInt32 = 127397
            var s = ""
            for v in countryCode.uppercased().unicodeScalars {
                s.unicodeScalars.append(UnicodeScalar(base + v.value)!)
            }
            return s
        }
        return nil
    }
    
}

class Formatter {
    
    static var standard: NumberFormatter {
        let c = NumberFormatter()
        c.locale = Locale(identifier: "en_US")
        c.usesGroupingSeparator = true
        c.groupingSeparator = ","
        c.decimalSeparator = "."
        c.maximumFractionDigits = 0
        c.numberStyle = .decimal
        return c
    }
    
    static var currency: NumberFormatter {
        let c = NumberFormatter()
        c.locale = Locale(identifier: "en_US")
        c.usesGroupingSeparator = true
        c.groupingSeparator = ","
        c.decimalSeparator = "."
        c.currencySymbol = "$"
        c.maximumFractionDigits = 0
        c.numberStyle = .currency
        return c
    }
    
    static var importData: NumberFormatter {
        let formatter = NumberFormatter()
        formatter.usesGroupingSeparator = true
        formatter.groupingSeparator = ","
        formatter.decimalSeparator = "."
        formatter.numberStyle = .decimal
        return formatter
    }
    
    static var basicDate: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "dd/MM/yyyy"
        return formatter
    }
    
    static var fileDate: DateFormatter {
        let formatter = DateFormatter()
        formatter.dateFormat = "yyyy_MM_dd"
        return formatter
    }
    
}

extension Date {
    
    var year: String {
        let dateFormatter = DateFormatter()
        dateFormatter.dateFormat = "YYYY"
        return dateFormatter.string(from: self)
    }
    
}

extension Int {
    
    var currencyFormatted: String {
        return Formatter.currency.string(from: NSNumber(value: self)) ?? ""
    }
    
    var rankFormatted: String {
        
        switch self {
        case 11:
            return "11th"
        case 12:
            return "12th"
        case 13:
            return "13th"
        default:
            let unit = "\(self)"
            let n = Int(String(unit.last!))
            switch n {
            case 1:
                return "\(self)st"
            case 2:
                return "\(self)nd"
            case 3:
                return "\(self)rd"
            default:
                return "\(self)th"
            }
        }
    }
}
        
extension Double {
    
    var formatted: String {
        return Formatter.standard.string(from: NSNumber(value: self)) ?? ""
    }
    
    var currencyFormatted: String {
        return Formatter.currency.string(from: NSNumber(value: self)) ?? ""
    }
    
}