// Copyright 2025 The ODML Authors.
//
// 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.

#include "runtime/engine/litert_lm_lib.h"

#include <filesystem>  // NOLINT
#include <string>

#include <gmock/gmock.h>
#include <gtest/gtest.h>
#include "absl/status/status.h"  // from @com_google_absl
#include "runtime/util/test_utils.h"  // IWYU pragma: keep

namespace litert {
namespace lm {
namespace {

using ::testing::status::StatusIs;

TEST(LiteRtLmLibTest, RunLiteRtLmWithEmptyModelPathReturnsError) {
  LiteRtLmSettings settings;
  settings.model_path = "";
  EXPECT_THAT(RunLiteRtLm(settings),
              StatusIs(absl::StatusCode::kInvalidArgument));
}

// Following tests are for various model file metadata and tokenizer types.
// They are not exhaustive, but designed to test a variety of scenarios.
// If metadata or tokenizer types are not handled properly, these tests could
// fail.
TEST(LiteRtLmLibTest, RunLiteRtLmWithValidModelPath) {
  const auto model_path =
      std::filesystem::path(::testing::SrcDir()) /
      "litert_lm/runtime/testdata/test_lm.litertlm";
  LiteRtLmSettings settings;
  settings.model_path = model_path.string();
  settings.backend = "cpu";
  // To save time on testing, and make sure we can end gracefully with this
  // test litertlm file, we only run 32 tokens.
  settings.max_num_tokens = 32;
  EXPECT_OK(RunLiteRtLm(settings));
}

TEST(LiteRtLmLibTest, RunLiteRtLmWithInferredGemma3ModelType) {
  const auto model_path =
      std::filesystem::path(::testing::SrcDir()) /
      "litert_lm/runtime/testdata/test_lm_no_model_type.litertlm";
  LiteRtLmSettings settings;
  settings.model_path = model_path.string();
  settings.backend = "cpu";
  // To save time on testing, and make sure we can end gracefully with this
  // test litertlm file, we only run 32 tokens.
  settings.max_num_tokens = 32;
  EXPECT_OK(RunLiteRtLm(settings));
}

TEST(LiteRtLmLibTest, RunLiteRtLmWithDeepseekMetadataTokenizer) {
  const auto model_path =
      std::filesystem::path(::testing::SrcDir()) /
      "litert_lm/runtime/testdata/test_lm_deepseek_metadata_tokenizer.litertlm";
  LiteRtLmSettings settings;
  settings.model_path = model_path.string();
  settings.backend = "cpu";
  // To save time on testing, and make sure we can end gracefully with this
  // test litertlm file, we only run 32 tokens.
  settings.max_num_tokens = 32;
  EXPECT_OK(RunLiteRtLm(settings));
}

}  // namespace
}  // namespace lm
}  // namespace litert