import Foundation

public struct NativeResponse: Sendable {
  public let data: Data
  public let status: Int
  public let headers: [String: String]

  /// Header names are stored lowercased so that `header(_:)` is case-insensitive.
  public init(data: Data, status: Int, headers: [String: String] = [:]) {
    self.data = data
    self.status = status
    var lowered: [String: String] = [:]
    for (key, value) in headers { lowered[key.lowercased()] = value }
    self.headers = lowered
  }

  public func header(_ name: String) -> String? { headers[name.lowercased()] }

  /// The typed failure this status means, or nil for 2xx.
  public var failure: NativeClientError? { NativeClientError.forStatus(status, body: data, headers: headers) }

  /// Throws the typed case for any status outside 2xx, so a caller that
  /// compared codes by hand can hand the decision to one mapping.
  @discardableResult
  public func requireSuccess() throws -> NativeResponse {
    if let failure { throw failure }
    return self
  }
}