// Copyright 2021 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

#ifndef CHROME_BROWSER_OPTIMIZATION_GUIDE_MODEL_VALIDATOR_KEYED_SERVICE_H_
#define CHROME_BROWSER_OPTIMIZATION_GUIDE_MODEL_VALIDATOR_KEYED_SERVICE_H_

#include "base/memory/raw_ptr.h"
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "base/sequence_checker.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/optimization_guide/core/model_execution/on_device_capability.h"
#include "components/optimization_guide/core/model_execution/remote_model_executor.h"
#include "components/optimization_guide/proto/model_execution.pb.h"
#include "components/optimization_guide/proto/model_validation.pb.h"
#include "components/signin/public/identity_manager/identity_manager.h"

class Profile;

namespace optimization_guide {

// Triggers validation of the model. Used for manual testing.
inline constexpr char kModelValidateSwitch[] =
    "optimization-guide-model-validate";

// Triggers validation of the server-side AI model execution. Used for
// integration testing.
inline constexpr char kModelExecutionValidateSwitch[] =
    "optimization-guide-model-execution-validate";

// Enables the on-device model to run validation at startup after a delay. A
// text file can be provided used as input for the validation job and an output
// file path can be provided to write the response to.
inline constexpr char kOnDeviceValidationRequestOverrideSwitch[] =
    "ondevice-validation-request-override";
inline constexpr char kOnDeviceValidationWriteToFileSwitch[] =
    "ondevice-validation-write-to-file";

// Returns whether model validator service should be started to validate various
// model executions such as TFLite, server-side AI, on-device AI models. Used
// for integration testing purposes.
bool ShouldStartModelValidator();

// Keyed service that validates models when enabled via command-line switch.
class ModelValidatorKeyedService : public KeyedService,
                                   public signin::IdentityManager::Observer {
 public:
  explicit ModelValidatorKeyedService(Profile* profile);
  ~ModelValidatorKeyedService() override;

 private:
  void StartModelExecutionValidation();

  // Kicks off the validation process for the on-device model.
  void StartOnDeviceModelExecutionValidation(
      std::unique_ptr<optimization_guide::proto::ModelValidationInput> input);

  // Calls the on-device model executor to execute the model.
  void PerformOnDeviceModelExecutionValidation(
      std::unique_ptr<optimization_guide::proto::ModelValidationInput> input);

  // Calls ExecuteModel on the on-device validation session.
  void ExecuteModel(
      std::unique_ptr<optimization_guide::proto::ExecuteRequest> request);

  // Invoked when model execution completes.
  void OnModelExecuteResponse(OptimizationGuideModelExecutionResult result,
                              std::unique_ptr<ModelQualityLogEntry> log_entry);

  // Invoked when on-device model execution completes.
  void OnDeviceModelExecuteResponse(
      const std::unique_ptr<optimization_guide::proto::ExecuteRequest>& request,
      OptimizationGuideModelStreamingExecutionResult result);

  // signin::IdentityManager::Observer:
  void OnPrimaryAccountChanged(
      const signin::PrimaryAccountChangeEvent& event_details) override;

  raw_ptr<Profile> profile_;
  std::unique_ptr<OnDeviceSession> on_device_validation_session_;

  base::ScopedObservation<signin::IdentityManager, ModelValidatorKeyedService>
      identity_manager_observation_{this};

  SEQUENCE_CHECKER(sequence_checker_);

  // Used to get `weak_ptr_` to self.
  base::WeakPtrFactory<ModelValidatorKeyedService> weak_ptr_factory_{this};
};

}  // namespace optimization_guide

#endif  // CHROME_BROWSER_OPTIMIZATION_GUIDE_MODEL_VALIDATOR_KEYED_SERVICE_H_