firebase-ios-sdk/GeminiLanguageModel/Sources/GeminiAPIDataModels/GenerateContent/GenerateContentResponse.swift

// Copyright 2026 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//      http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

import Foundation

/// An internal data model for `GenerateContentResponse`.
///
/// ### Gemini Developer API
///
/// Type: `GoogleAiGenerativelanguageV1betaGenerateContentResponse`
///
/// Response from the model supporting multiple candidate responses.
///
/// Safety ratings and content filtering are reported for both
/// prompt in `GenerateContentResponse.prompt_feedback` and for each candidate
/// in `finish_reason` and in `safety_ratings`. The API:
///  - Returns either all requested candidates or none of them
///  - Returns no candidates at all only if there was something wrong with the
///    prompt (check `prompt_feedback`)
///  - Reports feedback on each candidate in `finish_reason` and
///    `safety_ratings`.
///
/// ### Gemini Enterprise API
///
/// Type: `GoogleCloudAiplatformV1beta1GenerateContentResponse`
///
/// Response message for [PredictionService.GenerateContent].
package struct GenerateContentResponse: Codable, Sendable, Equatable, Hashable {
  /// Candidate responses from the model.
  ///
  /// ### Gemini Developer API
  ///
  /// Candidate responses from the model.
  ///
  /// ### Gemini Enterprise API
  ///
  /// Output only. Generated candidates.
  package let candidates: [Candidate]?

  /// Returns the prompt's feedback related to the content filters.
  ///
  /// ### Gemini Developer API
  ///
  /// Returns the prompt's feedback related to the content filters.
  ///
  /// ### Gemini Enterprise API
  ///
  /// Output only. Content filter results for a prompt sent in the request.
  /// Note: Sent only in the first stream chunk.
  /// Only happens when no candidates were generated due to content violations.
  package let promptFeedback: PromptFeedback?

  /// Output only. Metadata on the generation requests' token usage.
  ///
  /// ### Gemini Developer API
  ///
  /// Output only. Metadata on the generation requests' token usage.
  ///
  /// ### Gemini Enterprise API
  ///
  /// Usage metadata about the response(s).
  package let usageMetadata: UsageMetadata?

  /// Output only. The model version used to generate the response.
  package let modelVersion: String?

  /// Output only. response_id is used to identify each response.
  ///
  /// ### Gemini Developer API
  ///
  /// Output only. response_id is used to identify each response.
  ///
  /// ### Gemini Enterprise API
  ///
  /// Output only. response_id is used to identify each response. It is the encoding of the
  /// event_id.
  package let responseId: String?

  /// Output only. The current model status of this model.
  ///
  /// ### Gemini Developer API
  ///
  /// Output only. The current model status of this model.
  ///
  /// ### Gemini Enterprise API
  ///
  /// > Important: This property is not supported in the Gemini Enterprise API.
  package let modelStatus: ModelStatus?

  /// Output only. Timestamp when the request is made to the server.
  ///
  /// ### Gemini Developer API
  ///
  /// > Important: This property is not supported in the Gemini Developer API.
  ///
  /// ### Gemini Enterprise API
  ///
  /// Output only. Timestamp when the request is made to the server.
  package let createTime: String?

  /// Creates a new `GenerateContentResponse`.
  ///
  /// - Parameters:
  ///   - candidates: Candidate responses from the model. (behavior varies by backend). For more details, see ``candidates``.
  ///   - promptFeedback: Returns the prompt's feedback related to the content filters. (behavior varies by backend). For more details, see ``promptFeedback``.
  ///   - usageMetadata: Output only. Metadata on the generation requests' token usage. (behavior varies by backend). For more details, see ``usageMetadata``.
  ///   - modelVersion: Output only. The model version used to generate the response.
  ///   - responseId: Output only. response_id is used to identify each response. (behavior varies by backend). For more details, see ``responseId``.
  ///   - modelStatus: Output only. The current model status of this model. (Gemini Developer API only). For more details, see ``modelStatus``.
  ///   - createTime: Output only. Timestamp when the request is made to the server. (Gemini Enterprise API only). For more details, see ``createTime``.
  package init(
    candidates: [Candidate]? = nil,
    promptFeedback: PromptFeedback? = nil,
    usageMetadata: UsageMetadata? = nil,
    modelVersion: String? = nil,
    responseId: String? = nil,
    modelStatus: ModelStatus? = nil,
    createTime: String? = nil
  ) {
    self.candidates = candidates
    self.promptFeedback = promptFeedback
    self.usageMetadata = usageMetadata
    self.modelVersion = modelVersion
    self.responseId = responseId
    self.modelStatus = modelStatus
    self.createTime = createTime
  }
  enum CodingKeys: String, CodingKey {
    case candidates = "candidates"
    case promptFeedback = "promptFeedback"
    case usageMetadata = "usageMetadata"
    case modelVersion = "modelVersion"
    case responseId = "responseId"
    case modelStatus = "modelStatus"
    case createTime = "createTime"
  }
}