# Copyright 2019 Google
#
# 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.

# CMake file for the firebase_rest_lib library

cmake_minimum_required (VERSION 3.1)
# Firebase C++ SDK requires C++14.
set (CMAKE_CXX_STANDARD 14)
set (CMAKE_CXX_STANDARD_REQUIRED YES)  # Don't fall back to an earlier version.

project(firebase_rest_lib NONE)
enable_language(C)
enable_language(CXX)

set(rest_SRCS
    controller_curl.cc
    controller_interface.cc
    gzipheader.cc
    request.cc
    request_binary_gzip.cc
    request_file.cc
    response.cc
    response_binary.cc
    transport_builder.cc
    transport_curl.cc
    transport_interface.cc
    util.cc
    www_form_url_encoded.cc
    zlibwrapper.cc)

add_library(firebase_rest_lib STATIC
    ${rest_SRCS})

target_include_directories(firebase_rest_lib
  PUBLIC
    ${FIREBASE_CPP_SDK_ROOT_DIR}
    ${FLATBUFFERS_SOURCE_DIR}/include
    ${ZLIB_SOURCE_DIR}/..
    ${ZLIB_BINARY_DIR}
  PRIVATE
    ${CURL_SOURCE_DIR}/include
)

if(MSVC)
  set(rest_additional_defines
      -DWIN32_LEAN_AND_MEAN
      CURL_STATICLIB=1
      )
elseif(CMAKE_SYSTEM_NAME STREQUAL "Linux")
  set(rest_additional_defines
      -DFIREBASE_SSL_CAPATH="/etc/ssl/certs"
      )
else()
  set(rest_additional_defines)
endif()
target_compile_definitions(firebase_rest_lib
  PRIVATE
    -DINTERNAL_EXPERIMENTAL=1
    "${rest_additional_defines}"
)

set(FIREBASE_CURL_DEPENDENCY libcurl)
if (MSVC)
  # libcurl on Windows depends on internal Windows SSL via its crypt32 library.
  set(FIREBASE_CURL_DEPENDENCY ${FIREBASE_CURL_DEPENDENCY} crypt32)
endif()

# firebase_rest_lib has a dependency on flatbuffers, which needs to be included.
target_link_libraries(firebase_rest_lib
  PUBLIC
    firebase_app
  PRIVATE
    flatbuffers
    ${FIREBASE_CURL_DEPENDENCY}
    zlibstatic
    ${CMAKE_DL_LIBS}
)
# Automatically include headers that might not be declared.
if(MSVC)
  add_definitions(/FI"assert.h" /FI"string.h" /FI"stdint.h")
else()
  add_definitions(-include assert.h -include string.h)
endif()

# Add shared definitions across all platforms, and then platform specific ones.
add_definitions(
  # Use the curl_config.h generated by CMake.
  -DHAVE_CONFIG_H
  # Enable ZLIB in curl.
  -DHAVE_LIBZ
  # Ensure curl includes ZLIB headers.
  -DHAVE_ZLIB_H
  # Enforce stricter curl typechecking.
  -DCURL_STRICTER
  # Disable unused protocols/options to reduce vulnerability surface.
  -DCURL_DISABLE_FTP
  -DCURL_DISABLE_NTLM
  -DCURL_DISABLE_LIBCURL_OPTION
)

if(WIN32)
  # Add definitons used for the Windows builds.
  add_definitions(
    # Increase curl's default buffer size to increase throughput.
    -DCURL_MAX_WRITE_SIZE=16384
    # Enable SCHANNEL for Windows
    -DUSE_SCHANNEL
    -DUSE_WINDOWS_SSPI
    # Force synchronous DNS
    # (async DNS does not work with SCHANNEL).
    -DUSE_SYNC_DNS
  )
elseif(APPLE)
  # MacOS does not have any unique definitions.
else()
  # Add definitions used for Linux builds, but not MacOS.
  add_definitions(
    # Increase curl's default buffer size to increase throughput.
    -DCURL_MAX_WRITE_SIZE=65536
  )
endif()

if(FIREBASE_CPP_BUILD_TESTS)
  # Add the tests subdirectory
  add_subdirectory(tests)
endif()

cpp_pack_library(firebase_rest_lib "deps/app")
cpp_pack_library(libcurl "deps/app/external")
cpp_pack_library(zlibstatic "deps/app/external")
cpp_pack_library_file(${OPENSSL_SSL_LIBRARY} "deps/app/external")
cpp_pack_library_file(${OPENSSL_CRYPTO_LIBRARY} "deps/app/external")