//
// Stencil
// Copyright © 2022 Stencil
// MIT Licence
//

#if !os(Linux)
import Foundation

class NowNode: NodeType {
  let format: Variable
  let token: Token?

  class func parse(_ parser: TokenParser, token: Token) throws -> NodeType {
    var format: Variable?

    let components = token.components
    guard components.count <= 2 else {
      throw TemplateSyntaxError("'now' tags may only have one argument: the format string.")
    }
    if components.count == 2 {
      format = Variable(components[1])
    }

    return NowNode(format: format, token: token)
  }

  init(format: Variable?, token: Token? = nil) {
    self.format = format ?? Variable("\"yyyy-MM-dd 'at' HH:mm\"")
    self.token = token
  }

  func render(_ context: Context) throws -> String {
    let date = Date()
    let format = try self.format.resolve(context)

    var formatter: DateFormatter
    if let format = format as? DateFormatter {
      formatter = format
    } else if let format = format as? String {
      formatter = DateFormatter()
      formatter.dateFormat = format
    } else {
      return ""
    }

    return formatter.string(from: date)
  }
}
#endif