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import SwiftDate

/// Protocol that contains number formatting functions for often used number types.
public protocol DateFormattingService {

    associatedtype DateFormatType: DateFormat

    /// Region that will be used for parsing and formatting.
    var currentRegion: Region { get }

    /// Method parses date from string in given format with current region.
    /// If parsing fails - it returns default date in region.
    ///
    /// - Parameters:
    ///   - string: String to use for date parsing.
    ///   - format: Format that should be used for date parsing.
    ///   - defaultDate: Default date if formatting will fail.
    /// - Returns: Date parsed from given string or default date if parsing did fail.
    func date(from string: String, format: DateFormatType, defaultDate: DateInRegion) -> DateInRegion

    /// Method parses date from string in given format with passed region.
    ///
    /// - Parameters:
    ///   - string: String to use for date parsing.
    ///   - format: Format that should be used for date parsing.
    ///   - parsedIn: A region that should be used for date parsing. In case of nil defaultRegion will be used.
    /// - Returns: Date parsed from given string or default date if parsing did fail.
    func date(from string: String, format: DateFormatType, parsedIn: Region?) -> DateInRegion?

    /// Method format date in given format.
    ///
    /// - Parameters:
    ///   - date: Date to format.
    ///   - format: Format that should be used for date formatting.
    /// - Returns: String that contains formatted date or nil if formatting did fail.
    func string(from date: DateRepresentable, format: DateFormatType) -> String

    /// Method format date in given format for specific region.
    ///
    /// - Parameters:
    ///   - date: Date to format.
    ///   - format: Format that should be used for date formatting.
    ///   - formattedIn: A region that should be used for date formatting. In case of nil defaultRegion will be used.
    /// - Returns: String that contains formatted date or nil if formatting did fail.
    func string(from date: DateRepresentable, format: DateFormatType, formattedIn: Region?) -> String

}
