// Copyright 2024 Huawei Cloud Computing Technology Co., Ltd.
//
// 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.

#ifndef INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BAZEL_TREE_READER_HPP
#define INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BAZEL_TREE_READER_HPP

#include <filesystem>
#include <functional>
#include <optional>
#include <string>
#include <unordered_set>
#include <vector>

#include "gsl/gsl"
#include "src/buildtool/common/artifact.hpp"
#include "src/buildtool/common/artifact_blob.hpp"
#include "src/buildtool/common/artifact_digest.hpp"
#include "src/buildtool/common/bazel_types.hpp"
#include "src/buildtool/crypto/hash_function.hpp"
#include "src/buildtool/execution_api/remote/bazel/bazel_cas_client.hpp"
#include "src/buildtool/file_system/git_repo.hpp"

class BazelNetworkReader final {
    class IncrementalReader;

  public:
    using DumpCallback = std::function<bool(std::string const&)>;

    explicit BazelNetworkReader(std::string instance_name,
                                gsl::not_null<BazelCasClient const*> const& cas,
                                HashFunction hash_function) noexcept;

    [[nodiscard]] auto ReadDirectory(ArtifactDigest const& digest)
        const noexcept -> std::optional<bazel_re::Directory>;

    [[nodiscard]] auto ReadGitTree(ArtifactDigest const& digest) const noexcept
        -> std::optional<GitRepo::tree_entries_t>;

    [[nodiscard]] auto DumpRawTree(Artifact::ObjectInfo const& info,
                                   DumpCallback const& dumper) const noexcept
        -> bool;

    [[nodiscard]] auto DumpBlob(Artifact::ObjectInfo const& info,
                                DumpCallback const& dumper) const noexcept
        -> bool;

    // NOLINTNEXTLINE(readability-convert-member-functions-to-static)
    [[nodiscard]] auto StageBlobTo(
        Artifact::ObjectInfo const& /*info*/,
        std::filesystem::path const& /*output*/) const noexcept -> bool {
        return false;  // not implemented
    }

    [[nodiscard]] auto IsNativeProtocol() const noexcept -> bool;

    [[nodiscard]] auto ReadSingleBlob(ArtifactDigest const& digest)
        const noexcept -> std::optional<ArtifactBlob>;

    [[nodiscard]] auto Read(std::unordered_set<ArtifactDigest> const& digests)
        const noexcept -> std::unordered_set<ArtifactBlob>;

    [[nodiscard]] auto ReadOrdered(std::vector<ArtifactDigest> const& digests)
        const noexcept -> std::vector<ArtifactBlob>;

  private:
    std::string const instance_name_;
    BazelCasClient const& cas_;
    HashFunction hash_function_;
};

#endif  // INCLUDED_SRC_BUILDTOOL_EXECUTION_API_REMOTE_BAZEL_BAZEL_TREE_READER_HPP