//
//  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

open class DefaultRegexPlaceholderGenerator: RegexPlaceholderGenerator {

    public init() {}
    
    open func generatePlaceholder(matrixOfSymbols: [[Character]]) -> String {
        var placeholderStringBuilder = String()
        var indexes = [Array<Character>: Int]()

        matrixOfSymbols.forEach { listOfSymbols in
            indexes[listOfSymbols] = 0
        }
        
        matrixOfSymbols.filter { !$0.isEmpty }.forEach { listOfSymbols in
            if listOfSymbols.count == 1 {
                placeholderStringBuilder.append(listOfSymbols[0])
                return
            }
            
            if let index = indexes[listOfSymbols] {
                var newIndex = index
                
                if listOfSymbols.count <= newIndex {
                    newIndex = 0
                }
                
                placeholderStringBuilder.append(listOfSymbols[newIndex])
                newIndex += 1
                indexes[listOfSymbols] = newIndex
            }
        }

        return placeholderStringBuilder
    }
}