##
# Main CMake project file
# Contains global options and definitions
##

cmake_minimum_required(VERSION 2.8)

project(colobot C CXX)

##
# Project version
##
set(COLOBOT_VERSION_CODENAME "Gold")
set(COLOBOT_VERSION_MAJOR    0)
set(COLOBOT_VERSION_MINOR    1)
set(COLOBOT_VERSION_REVISION 0)

# Comment out when releasing
set(COLOBOT_VERSION_UNRELEASED "~pre-alpha")

# Append git characteristics to version
if(DEFINED COLOBOT_VERSION_UNRELEASED AND EXISTS "${CMAKE_SOURCE_DIR}/.git")
    find_package(Git)
    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --abbrev-ref HEAD
                    OUTPUT_VARIABLE GIT_BRANCH
                    OUTPUT_STRIP_TRAILING_WHITESPACE)
    execute_process(COMMAND ${GIT_EXECUTABLE} rev-parse --short HEAD
                    OUTPUT_VARIABLE GIT_REVISION
                    OUTPUT_STRIP_TRAILING_WHITESPACE)
    set(COLOBOT_VERSION_UNRELEASED "${COLOBOT_VERSION_UNRELEASED}-git-${GIT_BRANCH}~r${GIT_REVISION}")
endif()

set(COLOBOT_VERSION_FULL "${COLOBOT_VERSION_MAJOR}.${COLOBOT_VERSION_MINOR}.${COLOBOT_VERSION_REVISION}${COLOBOT_VERSION_UNRELEASED}")
message(STATUS "Building Colobot \"${COLOBOT_VERSION_CODENAME}\" (${COLOBOT_VERSION_FULL})")

# Include cmake directory with some additional scripts
set(CMAKE_MODULE_PATH ${CMAKE_MODULE_PATH} "${colobot_SOURCE_DIR}/cmake")


##
# Build options
##

# Global build type
if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE debug)
endif()

# Compiler detection
if ("${CMAKE_CXX_COMPILER_ID}" MATCHES "GNU")
    execute_process(
        COMMAND ${CMAKE_CXX_COMPILER} -dumpversion OUTPUT_VARIABLE GCC_VERSION)
    if (GCC_VERSION VERSION_GREATER 4.7 OR GCC_VERSION VERSION_EQUAL 4.7)
        message(STATUS "Detected GCC version 4.7+")
        set(CXX11_FLAGS "-std=gnu++11")
    elseif (GCC_VERSION VERSION_GREATER 4.6 OR GCC_VERSION VERSION_EQUAL 4.6)
        message(STATUS "Detected GCC version 4.6+")
        set(CXX11_FLAGS "-std=c++0x -Doverride=")
    else()
        message(FATAL_ERROR "${PROJECT_NAME} requires GCC 4.6 or greater.")
    endif()
elseif("${CMAKE_CXX_COMPILER_ID}" MATCHES "Clang")
    message(STATUS "Detected Clang compiler")
    set(CXX11_FLAGS "-std=c++11")
else()
    message(FATAL_ERROR "Your C++ compiler doesn't seem to support C++11.\n"
                        "Supported compilers at this time are GCC 4.6+ and clang.")
endif()

# Global compile flags
# These are specific to GCC/MinGW/clang; for other compilers, change as necessary
# The flags are used throughout src/ and test/ subdirs
set(COLOBOT_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wall -Wold-style-cast ${CXX11_FLAGS}")
set(COLOBOT_CXX_FLAGS_RELEASE "-O2")
set(COLOBOT_CXX_FLAGS_DEBUG "-g -O0")


# Asserts can be enabled/disabled regardless of build type
option(ASSERTS "Enable assert()s" ON)

# Building tests can be enabled/disabled
option(TESTS "Enable tests" ON)

# CBot can also be a static library
option(CBOT_STATIC "Build CBot as static libary" OFF)

# Generate desktop files, manpage, etc.
option(DESKTOP "Generate desktop files, manpages, etc" ON)

# Doxygen docs are optional for installation
option(INSTALL_DOCS "Install Doxygen-generated documentation" OFF)

# Build openal sound support
option(OPENAL_SOUND "Build openal sound support" OFF)


##
# Searching for packages
##

find_package(OpenGL 1.4 REQUIRED)
find_package(SDL 1.2.10 REQUIRED)
find_package(SDL_image 1.2 REQUIRED)
find_package(SDL_ttf 2.0 REQUIRED)
find_package(PNG 1.2 REQUIRED)
find_package(Gettext REQUIRED)

set(Boost_USE_STATIC_LIBS        ON)
set(Boost_USE_MULTITHREADED      ON)
set(Boost_USE_STATIC_RUNTIME    OFF)

set(Boost_ADDITIONALVERSION "1.51" "1.51.0")
find_package(Boost COMPONENTS system filesystem regex REQUIRED)

# This is useful on Windows, if linking against standard GLEW dll fails
option(GLEW_STATIC "Link statically with GLEW" OFF)

find_package(GLEW REQUIRED)

if (${OPENAL_SOUND})
    find_package(OpenAL REQUIRED)
    include("${colobot_SOURCE_DIR}/cmake/FindLibSndFile.cmake")
endif()


##
# Platform detection and some related checks
##

if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
    set(PLATFORM_WINDOWS 1)
    set(PLATFORM_LINUX   0)
    set(PLATFORM_OTHER   0)
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
    set(PLATFORM_WINDOWS 0)
    set(PLATFORM_LINUX   1)
    set(PLATFORM_OTHER   0)
else()
    set(PLATFORM_WINDOWS 0)
    set(PLATFORM_LINUX   0)
    set(PLATFORM_OTHER   1)
endif()

if(NOT ${ASSERTS})
    add_definitions(-DNDEBUG)
endif()

if(${TESTS})
    add_definitions(-DTESTS -DTEST_VIRTUAL=virtual)
else()
    add_definitions(-DTEST_VIRTUAL=)
endif()


##
# Additional settings to use when cross-compiling with MXE (http://mxe.cc/)
##

include("${colobot_SOURCE_DIR}/cmake/mxe.cmake")

##
# Additional settings for MSYS
##
include("${colobot_SOURCE_DIR}/cmake/msys.cmake")


##
# Summary of detected things
##
if (${PLATFORM_WINDOWS})
    message(STATUS "Build for Windows system")
elseif(${PLATFORM_LINUX})
    message(STATUS "Build for Linux system")
else()
    message(STATUS "Build for other system")
endif()


##
# Doxygen docs
##

find_package(Doxygen)

if(DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/Doxyfile.in ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile @ONLY)
    add_custom_target(doc
                      ${DOXYGEN_EXECUTABLE} ${CMAKE_CURRENT_BINARY_DIR}/Doxyfile
                      WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
                      COMMENT "Generating API documentation with Doxygen" VERBATIM)
endif()


##
# Targets
##

if(${TESTS})
    # Google Test library
    find_path(GTEST_SRC_DIR NAMES src/gtest.cc src/gtest-all.cc PATHS /usr/src PATH_SUFFIXES gtest)
    find_path(GTEST_INCLUDE_DIR gtest/gtest.h PATHS /usr/include)
    if(GTEST_SRC_DIR AND GTEST_INCLUDE_DIR)
        message(STATUS "Using system gtest library in ${GTEST_SRC_DIR}")
    else()
        message(STATUS "Using bundled gtest library")
        set(GTEST_SRC_DIR ${colobot_SOURCE_DIR}/lib/gtest)
        set(GTEST_INCLUDE_DIR ${colobot_SOURCE_DIR}/lib/gtest/include)
    endif()

    add_subdirectory(${GTEST_SRC_DIR} bin/gtest)

    # Google Mock library
    find_path(GMOCK_SRC_DIR NAMES src/gmock.cc src/gmock-all.cc PATHS /usr/src PATH_SUFFIXES gmock)
    find_path(GMOCK_INCLUDE_DIR gmock/gmock.h PATHS /usr/include)
    if(GMOCK_SRC_DIR AND GMOCK_INCLUDE_DIR)
        message(STATUS "Using system gmock library in ${GMOCK_SRC_DIR}")

        include_directories(${GMOCK_SRC_DIR})
        # gmock-all.cc includes all other sources
        add_library(gmock STATIC ${GMOCK_SRC_DIR}/src/gmock-all.cc)
    else()
        message(STATUS "Using bundled gmock library")
        set(GMOCK_SRC_DIR ${colobot_SOURCE_DIR}/lib/gmock)
        set(GMOCK_INCLUDE_DIR ${colobot_SOURCE_DIR}/lib/gmock/include)
        add_subdirectory(${GMOCK_SRC_DIR} bin/gmock)
    endif()


    # Tests targets
    enable_testing()
    add_subdirectory(test bin/test)

endif()

# Installation paths defined before compiling sources
if (${CMAKE_SYSTEM_NAME} MATCHES "Windows")
    set(COLOBOT_INSTALL_BIN_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot binary directory")
    set(COLOBOT_INSTALL_LIB_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot libraries directory")
    set(COLOBOT_INSTALL_DATA_DIR ${CMAKE_INSTALL_PREFIX}/data CACHE PATH "Colobot shared data directory")
    set(COLOBOT_INSTALL_I18N_DIR ${CMAKE_INSTALL_PREFIX}/ CACHE PATH "Colobot translations directory")
    set(COLOBOT_INSTALL_DOC_DIR ${CMAKE_INSTALL_PREFIX}/doc CACHE PATH "Colobot documentation directory")
else()
    set(COLOBOT_INSTALL_BIN_DIR ${CMAKE_INSTALL_PREFIX}/games CACHE PATH "Colobot binary directory")
    set(COLOBOT_INSTALL_LIB_DIR ${CMAKE_INSTALL_PREFIX}/lib/colobot CACHE PATH "Colobot libraries directory")
    set(COLOBOT_INSTALL_DATA_DIR ${CMAKE_INSTALL_PREFIX}/share/games/colobot CACHE PATH "Colobot shared data directory")
    set(COLOBOT_INSTALL_I18N_DIR ${CMAKE_INSTALL_PREFIX}/share/locale CACHE PATH "Colobot translations directory")
    set(COLOBOT_INSTALL_DOC_DIR ${CMAKE_INSTALL_PREFIX}/share/doc/colobot CACHE PATH "Colobot documentation directory")
endif()

# Subdirectory with sources
add_subdirectory(src bin)


##
# Installation
##

# Data: check if the submodule handles its own installation
if(EXISTS "${CMAKE_SOURCE_DIR}/data/CMakeLists.txt")
    message(STATUS "Data directory will install itself.")
    add_subdirectory(data)
else()
    message(WARNING "Data directory is not available; make sure colobot-data is installed in ${COLOBOT_INSTALL_DATA_DIR}.")
endif()

# Documentation
if(INSTALL_DOCS AND DOXYGEN_FOUND AND DOXYGEN_DOT_FOUND)
    install(DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}/doc/ DESTINATION ${COLOBOT_INSTALL_DOC_DIR} OPTIONAL)
endif()