//
//  Copyright (c) 2023 Touch Instinct
//
//  Permission is hereby granted, free of charge, to any person obtaining a copy
//  of this software and associated documentation files (the Software), to deal
//  in the Software without restriction, including without limitation the rights
//  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
//  copies of the Software, and to permit persons to whom the Software is
//  furnished to do so, subject to the following conditions:
//
//  The above copyright notice and this permission notice shall be included in
//  all copies or substantial portions of the Software.
//
//  THE SOFTWARE IS PROVIDED AS IS, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
//  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
//  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
//  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
//  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
//  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
//  THE SOFTWARE.
//

import Foundation

public final class TextFormatter {
    
    private let regex: String
    
    private let replaceGenerator: RegexReplaceGenerator
    private let placeholderGenerator: RegexPlaceholderGenerator

    public init(regex: String,
                replaceGenerator: RegexReplaceGenerator = DefaultRegexReplaceGenerator(),
                placeholderGenerator: RegexPlaceholderGenerator = DefaultRegexPlaceholderGenerator()) {
        self.regex = regex
        self.replaceGenerator = replaceGenerator
        self.placeholderGenerator = placeholderGenerator
    }
    
    public func getRegexReplacement() -> String {
        replaceGenerator.generateReplacement(for: regex).regexReplaceString
    }
    
    public func getRegexPlaceholder() -> String {
        let matrixOfSymbols = replaceGenerator.generateReplacement(for: regex).matrixOfSymbols
        
        return placeholderGenerator.generatePlaceholder(matrixOfSymbols: matrixOfSymbols)
    }
    
    public func getFormattedText(_ text: String) -> String {
        guard let expression = try? NSRegularExpression(pattern: regex, options: .caseInsensitive) else {
            fatalError("Cannot create NSRegularExpression from input regex")
        }
        
        return expression.stringByReplacingMatches(in: text,
                                                   options: .reportProgress,
                                                   range: NSMakeRange(0, text.count),
                                                   withTemplate: getRegexReplacement())
    }
}