// 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 "validator/result.h"

#include <vector>

#include "absl/base/nullability.h"
#include "absl/strings/str_split.h"
#include "absl/strings/string_view.h"
#include "absl/strings/strip.h"
#include "proto/manifest.pb.h"
#include "proto/validation_result.pb.h"

namespace credentio {
namespace {

const Manifest* GetManifest(const PartialValidationResultProto* result,
                            absl::string_view label) {
  if (result->active_manifest().label() == label) {
    return &result->active_manifest();
  }
  for (const auto& ingredient_manifest : result->ingredient_manifests()) {
    if (ingredient_manifest.label() == label) {
      return &ingredient_manifest;
    }
  }
  return nullptr;
}

Manifest* GetMutableManifest(PartialValidationResultProto* result,
                             absl::string_view label) {
  if (result->active_manifest().label() == label) {
    return result->mutable_active_manifest();
  }
  for (auto& ingredient_manifest : *result->mutable_ingredient_manifests()) {
    if (ingredient_manifest.label() == label) {
      return &ingredient_manifest;
    }
  }
  return nullptr;
}

}  // namespace

const Assertion* absl_nullable GetAssertion(
    const PartialValidationResultProto* result,
    absl::string_view assertion_uri) {
  if (!absl::ConsumePrefix(&assertion_uri, "self#jumbf=/c2pa/")) {
    return nullptr;
  }
  std::vector<absl::string_view> labels = absl::StrSplit(assertion_uri, '/');
  if (labels.size() != 3) {
    return nullptr;
  }
  if (labels[1] != "c2pa.assertions") {
    return nullptr;
  }
  absl::string_view manifest_label = labels[0];
  absl::string_view assertion_label = labels[2];
  const Manifest* manifest = GetManifest(result, manifest_label);
  if (manifest == nullptr) {
    return nullptr;
  }
  for (const auto& assertion : manifest->assertions()) {
    if (assertion.label() == assertion_label) {
      return &assertion;
    }
  }
  return nullptr;
}

Manifest* absl_nullable GetMutableManifestForAssertion(
    PartialValidationResultProto* result, absl::string_view assertion_uri) {
  if (!absl::ConsumePrefix(&assertion_uri, "self#jumbf=/c2pa/")) {
    return nullptr;
  }
  std::vector<absl::string_view> labels = absl::StrSplit(assertion_uri, '/');
  if (labels.size() != 3) {
    return nullptr;
  }
  if (labels[1] != "c2pa.assertions") {
    return nullptr;
  }
  absl::string_view manifest_label = labels[0];
  return GetMutableManifest(result, manifest_label);
}

}  // namespace credentio