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[rbdr/map] / Map / MapParser / Strategies / OpportunityParserStrategy.swift

import Foundation

struct OpportunityParserStrategy: MapParserStrategy {
  private let regex = MapParsingPatterns.opportunity

  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 == 5
  }

  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 multiplier = CGFloat(
      String(line[Range(match.range(at: 3), in: line)!]) == "-" ? -1.0 : 1.0)
    let vertex = String(line[Range(match.range(at: 2), in: line)!])
    let opportunityString = String(line[Range(match.range(at: 4), in: line)!])
    let opportunity = CGFloat(
      truncating: NumberFormatter().number(from: opportunityString) ?? 0.0)

    if let origin = vertices[vertex] {
      let destination = CGPoint(
        x: origin.position.x + opportunity * multiplier, y: origin.position.y)
      let opportunity = Opportunity(id: index, origin: origin.position, destination: destination)
      return (Opportunity.self, opportunity)
    }

    return (NSObject.self, NSObject())  // No matching object
  }
}