// Copyright 2017 The Bazel Authors. All rights reserved.
//
// 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.

package com.google.devtools.build.lib.packages.util;

import static com.google.devtools.build.lib.rules.python.PythonTestUtils.getPyLoad;

import com.google.devtools.build.lib.rules.proto.ProtoConstants;
import com.google.devtools.build.lib.testutil.TestConstants;
import java.io.IOException;

/**
 * Creates mock BUILD files required for the proto_library rule.
 */
public final class MockProtoSupport {
  private MockProtoSupport() {
    throw new UnsupportedOperationException();
  }

  /**
   * Setup the support for building proto_library. You additionally need to setup support for each
   * of the languages used in the specific test.
   *
   * <p>Cannot be used for integration tests that actually need to run protoc.
   */
  public static void setup(MockToolsConfig config) throws IOException {
    createNetProto2(config);
    setupWorkspace(config);
    registerProtoToolchain(config);
  }

  private static void registerProtoToolchain(MockToolsConfig config) throws IOException {
    config.append("WORKSPACE", "register_toolchains('tools/proto/toolchains:all')");
    config.create(
        "tools/proto/toolchains/BUILD",
        TestConstants.LOAD_PROTO_TOOLCHAIN,
        TestConstants.LOAD_PROTO_LANG_TOOLCHAIN,
        "proto_toolchain(name = 'protoc_sources',"
            + "proto_compiler = '"
            + ProtoConstants.DEFAULT_PROTOC_LABEL
            + "')");
  }

  /** Create a dummy "net/proto2 compiler and proto APIs for all languages and versions. */
  private static void createNetProto2(MockToolsConfig config) throws IOException {
    config.create(
        "net/proto2/compiler/public/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        sh_binary(
            name = "protocol_compiler",
            srcs = ["protocol_compiler.sh"],
        )
        """);

    if (config.isRealFileSystem()) {
      // when using a "real" file system, import the jars and link to ensure compilation
      config.create(
          "java/com/google/io/protocol/BUILD",
          """
          package(default_visibility = ["//visibility:public"])

          java_import(
              name = "protocol",
              jars = ["protocol.jar"],
          )
          """);
      config.create(
          "java/com/google/io/protocol2/BUILD",
          """
          package(default_visibility = ["//visibility:public"])

          java_import(
              name = "protocol2",
              jars = ["protocol2.jar"],
          )
          """);

      config.linkTool("javatests/com/google/devtools/build/lib/prepackaged_protocol_deploy.jar",
          "java/com/google/io/protocol/protocol.jar");
      config.linkTool("javatests/com/google/devtools/build/lib/prepackaged_protocol2_deploy.jar",
          "java/com/google/io/protocol2/protocol2.jar");
    } else {
      // for "fake" file systems, provide stub rules. This is different from the "real" filesystem,
      // as it produces the interface jars that the production environment has.
      config.create(
          "java/com/google/io/protocol/BUILD",
          """
          package(default_visibility = ["//visibility:public"])

          java_library(
              name = "protocol",
              srcs = ["Protocol.java"],
          )
          """);
      config.create("java/com/google/io/protocol/Protocol.java");
      config.create(
          "java/com/google/io/protocol2/BUILD",
          """
          package(default_visibility = ["//visibility:public"])

          java_library(
              name = "protocol2",
              srcs = ["Protocol2.java"],
          )
          """);
      config.create("java/com/google/io/protocol/Protocol2.java");
    }

    config.create(
        "java/com/google/protobuf/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        proto_library(
            name = "protobuf_proto_sources",
            srcs = [],
        )
        """);

    // RPC generator plugins.
    config.create(
        "net/rpc/compiler/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_binary(
            name = "proto2_py_plugin",
            srcs = ["proto2_py_plugin.cc"],
        )

        cc_binary(
            name = "proto2_java_plugin",
            srcs = ["proto2_java_plugin.cc"],
        )
        """);

    config.create(
        "net/grpc/compiler/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_binary(
            name = "composite_cc_plugin",
            srcs = ["composite_cc_plugin.cc"],
        )
        """);

    // Fake targets for proto API libs of all languages and versions.
    config.create(
        "net/proto2/public/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_library(
            name = "cc_proto_library_blaze_internal_deps",
            srcs = ["cc_proto_library_blaze_internal_deps.cc"],
        )
        """);
    config.create(
        "net/proto2/python/public/BUILD",
        getPyLoad("py_library"),
        "package(default_visibility=['//visibility:public'])",
        "py_library(name = 'public',",
        "           srcs = [ 'pyproto2.py' ])");
    config.create(
        "net/proto2/bridge/public/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_library(
            name = "compatibility_mode_support",
            srcs = ["compatibility.cc"],
        )
        """);
    config.create(
        "net/proto/BUILD",
        getPyLoad("py_library"),
        "package(default_visibility=['//visibility:public'])",
        "cc_library(name = 'proto',",
        "           srcs = [ 'proto.cc' ])",
        "py_library(name = 'pyproto',",
        "           srcs = [ 'pyproto.py' ])");
    config.create(
        "net/proto/python/BUILD",
        getPyLoad("py_library"),
        "package(default_visibility=['//visibility:public'])",
        "py_library(name = 'proto1',",
        "           srcs = [ 'pyproto.py' ])");
    config.create(
        "net/rpc/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_library(name = "stubby12_proto_rpc_libs")
        """);
    config.create(
        "net/rpc4/public/core/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_library(name = "stubby4_rpc_libs")
        """);
    config.create(
        "net/grpc/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        cc_library(
            name = "grpc++_codegen_lib",
            srcs = ["grpc++_codegen_lib.cc"],
        )
        """);
    config.create(
        "net/rpc/python/BUILD",
        getPyLoad("py_library"),
        "py_library(name = 'proto_python_api_2_stub',",
        "           srcs = [ 'test_only_prefix_proto_python_api_2_stub.py' ],",
        "           visibility = ['//visibility:public'],",
        ")");
    config.create(
        "java/com/google/net/rpc/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        java_library(
            name = "rpc",
            srcs = ["Rpc.java"],
        )

        java_library(
            name = "rpc_noloas_internal",
            srcs = ["RpcNoloas.java"],
        )
        """);
    config.create(
        "java/com/google/net/rpc3/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        java_library(
            name = "rpc3_proto_runtime",
            srcs = ["Rpc3.java"],
            deps = [":rpc3_noloas_internal"],
        )

        java_library(
            name = "rpc3_noloas_internal",
            srcs = ["Rpc3Noloas.java"],
            deps = ["//java/com/google/net/rpc:rpc_noloas_internal"],
        )
        """);
    config.create(
        "net/proto2/proto/BUILD",
        TestConstants.LOAD_PROTO_LIBRARY,
        "package(default_visibility=['//visibility:public'])",
        "genrule(name = 'go_internal_bootstrap_hack',",
        "        srcs = [ 'descriptor.pb.go-prebuilt' ],",
        "        outs = [ 'descriptor.pb.go' ],",
        "        cmd = '')",
        "proto_library(name='descriptor',",
        "              srcs=['descriptor.proto'])");
    config.create(
        "net/proto2/go/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        go_library(
            name = "protodeps",
            srcs = ["protodeps.go"],
        )
        """);
    config.create(
        "net/proto2/compiler/go/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        go_binary(
            name = "protoc-gen-go",
            srcs = ["main.go"],
        )
        """);
    config.create(
        "net/rpc/go/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        go_library(
            name = "rpc",
            srcs = ["rpc.go"],
        )
        """);
    config.create(
        "go/context/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        go_library(
            name = "context",
            srcs = ["context.go"],
        )
        """);
    // TODO(b/77901188): remove once j_p_l migration is complete
    config.create(
        "third_party/java/jsr250_annotations/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        licenses(["notice"])

        java_library(
            name = "jsr250_source_annotations",
            srcs = ["Generated.java"],
        )
        """);
    config.create(
        "third_party/golang/grpc/metadata/BUILD",
        """
        package(default_visibility = ["//visibility:public"])

        licenses(["notice"])

        go_library(
            name = "metadata",
            srcs = ["metadata.go"],
        )
        """);
  }

  public static void setupWorkspace(MockToolsConfig config) throws IOException {
    if (TestConstants.PRODUCT_NAME.equals("bazel")) {
      config.append(
          "WORKSPACE",
          "local_repository(",
          "    name = 'rules_proto',",
          "    path = 'third_party/bazel_rules/rules_proto',",
          ")");
    }

    config.create(
        "third_party/bazel_rules/rules_proto/proto/BUILD",
        """
        licenses(["notice"])

        toolchain_type(
            name = "toolchain_type",
            visibility = ["//visibility:public"],
        )
        """);
    config.create(
        "third_party/bazel_rules/rules_proto/proto/defs.bzl",
        """
        load(":proto_lang_toolchain.bzl", _proto_lang_toolchain = "proto_lang_toolchain")

        def _add_tags(kargs):
            if "tags" in kargs:
                kargs["tags"] += ["__PROTO_RULES_MIGRATION_DO_NOT_USE_WILL_BREAK__"]
            else:
                kargs["tags"] = ["__PROTO_RULES_MIGRATION_DO_NOT_USE_WILL_BREAK__"]
            return kargs

        def proto_library(**kargs):
            native.proto_library(**_add_tags(kargs))

        def proto_lang_toolchain(**kargs):
            _proto_lang_toolchain(**_add_tags(kargs))
        """);
    config.create(
        "third_party/bazel_rules/rules_proto/proto/proto_toolchain.bzl",
        "load(':proto_toolchain_rule.bzl', _proto_toolchain_rule = 'proto_toolchain')",
        "def proto_toolchain(*, name, proto_compiler, exec_compatible_with = []):",
        "  _proto_toolchain_rule(name = name, proto_compiler = proto_compiler)",
        "  native.toolchain(",
        "    name = name + '_toolchain',",
        "    toolchain_type = '" + TestConstants.PROTO_TOOLCHAIN + "',",
        "    exec_compatible_with = exec_compatible_with,",
        "    target_compatible_with = [],",
        "    toolchain = name,",
        "  )");
    config.create(
        "third_party/bazel_rules/rules_proto/proto/proto_toolchain_rule.bzl",
        """
ProtoLangToolchainInfo = proto_common_do_not_use.ProtoLangToolchainInfo

def _impl(ctx):
    return [
        DefaultInfo(
            files = depset(),
            runfiles = ctx.runfiles(),
        ),
        platform_common.ToolchainInfo(
            proto = ProtoLangToolchainInfo(
                out_replacement_format_flag = ctx.attr.command_line,
                output_files = ctx.attr.output_files,
                plugin = None,
                runtime = None,
                proto_compiler = ctx.attr.proto_compiler.files_to_run,
                protoc_opts = ctx.fragments.proto.experimental_protoc_opts,
                progress_message = ctx.attr.progress_message,
                mnemonic = ctx.attr.mnemonic,
                allowlist_different_package = None,
                toolchain_type =
                    "//third_party/bazel_rules/rules_proto/proto:toolchain_type",
            ),
        ),
    ]

proto_toolchain = rule(
    _impl,
    attrs = {
        "progress_message": attr.string(default =
                                            "Generating Descriptor Set proto_library %{label}"),
        "mnemonic": attr.string(default = "GenProtoDescriptorSet"),
        "command_line": attr.string(default = "--descriptor_set_out=%s"),
        "output_files": attr.string(
            values = ["single", "multiple", "legacy"],
            default = "single",
        ),
        "proto_compiler": attr.label(
            cfg = "exec",
            executable = True,
            allow_files = True,
        ),
    },
    provides = [platform_common.ToolchainInfo],
    fragments = ["proto"],
)
""");
    config.create(
        "third_party/bazel_rules/rules_proto/proto/proto_lang_toolchain.bzl",
        """
        def proto_lang_toolchain(
                *,
                name,
                toolchain_type = None,
                exec_compatible_with = [],
                target_compatible_with = [],
                **attrs):
            native.proto_lang_toolchain(name = name, toolchain_type = toolchain_type, **attrs)
            if toolchain_type:
                native.toolchain(
                    name = name + "_toolchain",
                    toolchain_type = toolchain_type,
                    exec_compatible_with = exec_compatible_with,
                    target_compatible_with = target_compatible_with,
                    toolchain = name,
                )
        """);
  }
}