cmake_minimum_required(VERSION 3.3)
project(webrtc)

find_package(Git REQUIRED)
if (WIN32)
  set(PYTHON_EXECUTABLE ${DEPOT_TOOLS_PATH}/python.bat)
else (WIN32)
  find_package(PythonInterp 2.7 REQUIRED)
endif (WIN32)

include(LibWebRTCExecute)

if (WEBRTC_REVISION)
  libwebrtc_execute(
      COMMAND ${GIT_EXECUTABLE} checkout ${WEBRTC_REVISION}
      OUTPUT_VARIABLE _WEBRTC_CHECKOUT
      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
      STAMPFILE webrtc-checkout-commit
      STATUS "Checking out webrtc to commit ${WEBRTC_REVISION}"
      ERROR "Unable to checkout webrtc to commit ${WEBRTC_REVISION}"
  )
elseif (WEBRTC_BRANCH_HEAD)
  libwebrtc_execute(
      COMMAND ${GIT_EXECUTABLE} config remote.origin.fetch +refs/branch-heads/*:refs/remotes/branch-heads/* ^\\+refs/branch-heads/\\*:.*$
      OUTPUT_VARIABLE _WEBRTC_CONFIG_FETCH
      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
      STAMPFILE webrtc-config-fetch
      STATUS "Setting up branch-heads refspecs"
      ERROR "Unable to add branch-heads refspec to the git config"
  )

  libwebrtc_execute(
      COMMAND ${GIT_EXECUTABLE} fetch origin ${WEBRTC_BRANCH_HEAD}
      OUTPUT_VARIABLE _WEBRTC_FETCH
      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
      STAMPFILE webrtc-fetch-branch-heads
      STATUS "Fetching ${WEBRTC_BRANCH_HEAD}"
      ERROR "Unable to fetch ${WEBRTC_BRANCH_HEAD}"
  )

  libwebrtc_execute(
      COMMAND ${GIT_EXECUTABLE} checkout FETCH_HEAD
      OUTPUT_VARIABLE _WEBRTC_CHECKOUT
      WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
      STAMPFILE webrtc-checkout-branch-head
      STATUS "Checking out ${WEBRTC_BRANCH_HEAD}"
      ERROR "Unable to checkout ${WEBRTC_BRANCH_HEAD}"
  )
endif (WEBRTC_REVISION)

include(DepotTools)
include(GClient)
include(Environment)
include(LibWebRTCCommand)

libwebrtc_command(
    NAME webrtc-sync
    COMMAND ${GCLIENT_EXECUTABLE} sync --nohooks
    WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
    COMMENT "Synchronizing WebRTC"
)

libwebrtc_command(
    NAME webrtc-clang
    COMMAND ${PYTHON_EXECUTABLE} src/tools/clang/scripts/update.py
    WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
    COMMENT "Updating clang"
    DEPENDS webrtc-sync
)
set(_DEPENDENCIES webrtc-clang)

if (UNIX AND NOT APPLE)
  libwebrtc_command(
      NAME webrtc-toolchain
      COMMAND ${PYTHON_EXECUTABLE} ${WEBRTC_PARENT_DIR}/src/build/linux/sysroot_scripts/install-sysroot.py --running-as-hook
      WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
      COMMENT "Retrieving sysroot"
      DEPENDS webrtc-sync
  )
  set(_DEPENDENCIES ${_DEPENDENCIES} webrtc-toolchain)

  set(_PLATFORM linux*)
  set(_FOLDER linux64)
elseif (APPLE)
  set(_PLATFORM darwin)
  set(_FOLDER mac)
elseif (WIN32)
  libwebrtc_command(
      NAME webrtc-toolchain
      COMMAND ${PYTHON_EXECUTABLE} src/build/vs_toolchain.py update
      WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
      COMMENT "Retrieving Visual Studio toolchain"
      DEPENDS webrtc-sync
  )
  set(_DEPENDENCIES ${_DEPENDENCIES} webrtc-toolchain)

  set(_PLATFORM win32)
  set(_FOLDER win)
  set(_SUFFIX .exe)
  set(_SCRIPT_SUFFIX .bat)
endif (UNIX AND NOT APPLE)

set(_GN_COMMAND download_from_google_storage${_SCRIPT_SUFFIX} --no_resume --platform=${_PLATFORM}
    --no_auth --bucket chromium-gn
    -s src/buildtools/${_FOLDER}/gn${_SUFFIX}.sha1)

libwebrtc_command(
    NAME webrtc-gn
    COMMAND ${_GN_COMMAND}
    WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
    COMMENT "Fetching gn${_SUFFIX} for ${_PLATFORM}"
    DEPENDS webrtc-sync
)
set(_DEPENDENCIES ${_DEPENDENCIES} webrtc-gn)

set(_CLANG_FORMAT_COMMAND download_from_google_storage${_SCRIPT_SUFFIX} --no_resume
    --platform=${_PLATFORM} --no_auth --bucket chromium-clang-format
    -s src/buildtools/${_FOLDER}/clang-format${_SUFFIX}.sha1)

libwebrtc_command(
    NAME webrtc-clang-format
    COMMAND ${_CLANG_FORMAT_COMMAND}
    WORKING_DIRECTORY "${WEBRTC_PARENT_DIR}"
    COMMENT "Fetching clang-format${_SUFFIX} for ${_PLATFORM}"
    DEPENDS webrtc-gn
)
set(_DEPENDENCIES ${_DEPENDENCIES} webrtc-clang-format)

include(Gn)

libwebrtc_command(
    NAME webrtc-generate
    COMMAND ${_GEN_COMMAND}
    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
    COMMENT "Generating build files"
    DEPENDS ${_DEPENDENCIES}
)

set(_NINJA_COMMAND ninja ${NINJA_ARGS} -C ${_NINJA_BUILD_DIR} webrtc system_wrappers_default libjingle_peerconnection)

if (BUILD_TESTS)
  set(_NINJA_COMMAND ${_NINJA_COMMAND} webrtc_tests)
endif (BUILD_TESTS)

libwebrtc_command(
    NAME webrtc-build
    COMMAND ${_NINJA_COMMAND}
    WORKING_DIRECTORY "${CMAKE_SOURCE_DIR}"
    COMMENT "Running ninja"
    DEPENDS webrtc-generate
)