// 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
//
//    https://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 "formats/zip/assessor.h"

#include <string>

#include "absl/status/status.h"
#include "absl/status/status_matchers.h"
#include "gmock/gmock.h"
#include "gtest/gtest.h"
#include "riegeli/bytes/string_reader.h"

namespace credentio {
namespace {

using ::absl_testing::IsOkAndHolds;
using ::absl_testing::StatusIs;
using ::testing::HasSubstr;

TEST(IsSupportedTest, ErrorTooFewBytes) {
  std::string zip = "P";
  riegeli::StringReader<> reader(zip);

  EXPECT_THAT(
      ZipAssessor().IsSupported(reader),
      StatusIs(absl::StatusCode::kDataLoss, HasSubstr("kUnexpectedEof")));
}

TEST(IsSupportedTest, FalseForInvalidBeginning) {
  std::string zip = "this_is_not_a_zip";
  riegeli::StringReader<> reader(zip);

  EXPECT_THAT(ZipAssessor().IsSupported(reader), IsOkAndHolds(false));
}

TEST(IsSupportedTest, ValidStartingBytes) {
  std::string zip = "PK\x03\x04\xab\xcd";
  riegeli::StringReader<> reader(zip);

  EXPECT_THAT(ZipAssessor().IsSupported(reader), IsOkAndHolds(true));
}

TEST(IsSupportedTest, ValidStartingBytesAtOffset2) {
  std::string zip = "\xab\xcdPK\x03\x04";
  riegeli::StringReader<> reader(zip);

  // Invalid at offset 0
  EXPECT_THAT(ZipAssessor().IsSupported(reader), IsOkAndHolds(false));
  ASSERT_TRUE(reader.Seek(2));
  // Valid at offset 2
  EXPECT_THAT(ZipAssessor().IsSupported(reader), IsOkAndHolds(true));
}

}  // namespace
}  // namespace credentio