import Foundation

struct StageParserStrategy: MapParserStrategy {
  private let regex = MapParsingPatterns.stage

  func canHandle(line: String) -> Bool {
    let range = NSRange(location: 0, length: line.utf16.count)
    let matches = regex.matches(in: String(line), options: [], range: range)
    return matches.count > 0 && matches[0].numberOfRanges == 3
  }

  func handle(index: Int, line: String, vertices: [String: Vertex]) -> (Any.Type, Any) {
    let range = NSRange(location: 0, length: line.utf16.count)
    let matches = regex.matches(in: String(line), options: [], range: range)

    let match = matches[0]
    let stage = String(line[Range(match.range(at: 1), in: line)!])
    let dimensionsString = String(line[Range(match.range(at: 2), in: line)!])
    let dimensions = CGFloat(truncating: NumberFormatter().number(from: dimensionsString) ?? 0.0)

    let stageDimensions = StageDimensions(index: stage.count - 1, dimensions: dimensions)
    return (StageDimensions.self, stageDimensions)
  }
}