# ---------------------------------------------------------------------------
#                         Copyright Joe Drago 2018.
#         Distributed under the Boost Software License, Version 1.0.
#            (See accompanying file LICENSE_1_0.txt or copy at
#                  http://www.boost.org/LICENSE_1_0.txt)
# ---------------------------------------------------------------------------

cmake_minimum_required(VERSION 3.5) # This is so high because of libwebp
project(colorist)

# Ignore this awful (temporary) line! This awful hack lets people dodge all kinds of awful linker errors with symlinks
link_directories(${CMAKE_BINARY_DIR})

option(COLORIST_SUPPRESS_REGENERATION "Disable autodetection of CMake changes." OFF)
if(COLORIST_SUPPRESS_REGENERATION)
  set(CMAKE_SUPPRESS_REGENERATION TRUE)
endif()

set(CMAKE_CONFIGURATION_TYPES "Debug;Release")

if(NOT CMAKE_BUILD_TYPE)
    set(CMAKE_BUILD_TYPE "Debug")
endif()

set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -DCOLORIST_DEBUG=1")

if(UNIX)
  set(CMAKE_C_FLAGS_DEBUG "${CMAKE_C_FLAGS_DEBUG} -g")
  add_definitions(-DANSI=1 -D__ANSI__=1) # for jxrlib
  add_definitions(-DOPJ_SKIP_POISON=1) # for openjpeg

  if(COLORIST_COVERAGE)
    set(CMAKE_C_FLAGS "${CMAKE_C_FLAGS} -fprofile-instr-generate -fcoverage-mapping")
    # set(CMAKE_C_LINK_FLAGS "${CMAKE_C_LINK_FLAGS} -fprofile-instr-generate")
  endif()
endif()

find_package(Git)
if(GIT_FOUND)
  execute_process(
    COMMAND git log -1 --format=%h
    WORKING_DIRECTORY ${CMAKE_SOURCE_DIR}
    OUTPUT_VARIABLE GIT_COMMIT
    OUTPUT_STRIP_TRAILING_WHITESPACE
  )
  if(NOT GIT_COMMIT)
    set(GIT_COMMIT "Unknown")
  endif()
  add_definitions(-DGIT_COMMIT="${GIT_COMMIT}")
endif()

if(HOMEBREW_BUILD)
  add_definitions(-DHOMEBREW_BUILD=1)
endif()

option(COLORIST_USE_LIBJPEG_TURBO "Use libjpeg-turbo instead of regular libjpeg" OFF)
if(COLORIST_USE_LIBJPEG_TURBO)
    enable_language(ASM_NASM)
    add_definitions(-DCOLORIST_LIBJPEG_TURBO=1)
endif()

add_subdirectory(ext)
include_directories(${COLORIST_EXT_INCLUDES})

# Enable all warnings for lib/bin
if(CMAKE_CXX_COMPILER_ID MATCHES "Clang")
  MESSAGE(STATUS "Enabling warnings (for colorist lib/bin) for Clang")
  add_definitions(
    -Weverything
    -Werror
    -Wno-bad-function-cast
    -Wno-c11-extensions
    -Wno-cast-align
    -Wno-cast-qual
    -Wno-covered-switch-default
    -Wno-deprecated-declarations
    -Wno-disabled-macro-expansion
    -Wno-double-promotion
    -Wno-format-nonliteral
    -Wno-language-extension-token
    -Wno-missing-noreturn
    -Wno-padded
    -Wno-reserved-id-macro
    -Wno-sign-conversion
    -Wno-switch-enum
    -Wno-undef
  )
  # The detection of cross compilation by -Wpoison-system-directories has false positives on macOS because
  # --sysroot is implicitly added. Turn the warning off.
  check_c_compiler_flag(-Wpoison-system-directories HAVE_POISON_SYSTEM_DIRECTORIES_WARNING)
  if(HAVE_POISON_SYSTEM_DIRECTORIES_WARNING)
      add_definitions(-Wno-poison-system-directories)
  endif()
elseif(CMAKE_CXX_COMPILER_ID MATCHES "GNU")
  add_definitions(-std=c99) # Enforce C99 for gcc
  MESSAGE(STATUS "Enabling warnings (for colorist lib/bin) for GCC")
  add_definitions(-Werror -Wall -Wextra -Wno-clobbered -Wno-stringop-truncation)
elseif(CMAKE_CXX_COMPILER_ID MATCHES "MSVC")
  MESSAGE(STATUS "Enabling warnings (for colorist lib/bin) for MS CL")
  add_definitions(
    /Wall   # All warnings
    /WX     # Warnings as errors
    /wd4255 # Disable: no function prototype given
    /wd4324 # Disable: structure was padded due to alignment specifier
    /wd4668 # Disable: is not defined as a preprocessor macro, replacing with '0'
    /wd4710 # Disable: function not inlined
    /wd4711 # Disable: function selected for inline expansion
    /wd4738 # Disable: storing 32-bit float result in memory, possible loss of performance
    /wd4820 # Disable: bytes padding added after data member
    /wd4996 # Disable: potentially unsafe stdlib methods
    /wd5045 # Disable: Compiler will insert Spectre mitigation for memory load if /Qspectre switch specified
  )
else()
  MESSAGE(FATAL_ERROR "Unknown compiler, bailing out")
endif()

add_subdirectory(lib)
include_directories(lib/include)

add_subdirectory(bin)

set(LLVM_PREFIX "")
if(APPLE)
  set(LLVM_PREFIX "/usr/bin/xcrun")
endif()

if(COLORIST_COVERAGE)
  add_custom_target(colorist-test-ccov-preprocessing
      COMMAND LLVM_PROFILE_FILE=colorist-test.profraw $<TARGET_FILE:colorist-test> coverage
      COMMAND ${LLVM_PREFIX} llvm-profdata merge -sparse colorist-test.profraw -o colorist-test.profdata
      DEPENDS colorist-test)

#  add_custom_target(colorist-test-ccov-show
#      COMMAND ${LLVM_PREFIX} llvm-cov show $<TARGET_FILE:colorist-test> -instr-profile=colorist-test.profdata -show-line-counts-or-regions
#      DEPENDS colorist-test-ccov-preprocessing)

  add_custom_target(coverage-cli
      COMMAND ${LLVM_PREFIX} llvm-cov report $<TARGET_FILE:colorist-test> -instr-profile=colorist-test.profdata ${CMAKE_CURRENT_SOURCE_DIR}/lib
      DEPENDS colorist-test-ccov-preprocessing)

  add_custom_target(coverage
      COMMAND ${LLVM_PREFIX} llvm-cov show $<TARGET_FILE:colorist-test> -instr-profile=colorist-test.profdata -show-expansions -show-line-counts-or-regions -output-dir=${CMAKE_BINARY_DIR}/colorist-test-llvm-cov -format="html" ${CMAKE_CURRENT_SOURCE_DIR}/lib
      DEPENDS colorist-test-ccov-preprocessing)

  add_custom_command(TARGET coverage POST_BUILD
      COMMAND ;
      COMMENT "Open ${CMAKE_RUNTIME_OUTPUT_DIRECTORY}/${TARGET_NAME}-llvm-cov/index.html in your browser to view the coverage report."
  )
endif()

if(COLORIST_TEST_IO)
  add_custom_target(colorist-test-io
      COMMAND $<TARGET_FILE:colorist-test> io
      DEPENDS colorist-test
  )
endif()