cmake_minimum_required(VERSION 2.8)
project(libcaption)
set(CMAKE_C_FLAGS "-Wall -O3")
add_definitions(-D__STDC_CONSTANT_MACROS)
if (WIN32)
  add_definitions(-D_CRT_SECURE_NO_WARNINGS)
endif()

# If CMAKE_BUILD_TYPE is not specified, then default to Release
if(NOT CMAKE_BUILD_TYPE)
  set(CMAKE_BUILD_TYPE Release CACHE STRING "" FORCE)
endif()

# Don't need to prefix local includes with "caption/*"
include_directories(${PROJECT_SOURCE_DIR}/caption)

option(ENABLE_RE2C "Use RE2C to generate eia608.c" OFF)
set(eia608_from_utf8_c ${PROJECT_SOURCE_DIR}/src/eia608_from_utf8.c)
set(eia608_from_utf8_c_cached ${PROJECT_SOURCE_DIR}/src/eia608_from_utf8.c.cached)
if(ENABLE_RE2C)
  find_program(RE2C re2c)
  set(eia608_from_utf8_re2c ${PROJECT_SOURCE_DIR}/src/eia608_from_utf8.re2c)
  if(RE2C)
    message(STATUS "Found re2c: ${RE2C}")

    # Create a temporary file until re2c regenerates it so that CMake doesn't
    # complain about the missing source file
    if(NOT EXISTS ${eia608_from_utf8_c})
      file(WRITE ${eia608_from_utf8_c} "")
    endif()

    add_custom_target(re2c
      COMMAND ${CMAKE_COMMAND} -E remove ${eia608_from_utf8_c}
      COMMAND ${RE2C} -bis -o ${eia608_from_utf8_c} ${eia608_from_utf8_re2c}
      COMMAND ${CMAKE_COMMAND} -E copy ${eia608_from_utf8_c} ${eia608_from_utf8_c_cached}
      DEPENDS ${eia608_from_utf8_re2c}
      COMMENT "Generating ${eia608_from_utf8_re2c}")
  else()
    message(SEND_ERROR "Could not find re2c executable")
  endif()
else()
  message(WARNING "Using cached re2c file: ${eia608_from_utf8_c_cached}")
  if(NOT EXISTS ${eia608_from_utf8_c})
    file(WRITE ${eia608_from_utf8_c} "")
  endif()
  configure_file(${eia608_from_utf8_c_cached} ${eia608_from_utf8_c} COPYONLY)
endif()

set(CAPTION_SOURCES
  src/utf8.c
  src/srt.c
  src/scc.c
  src/avc.c
  src/xds.c
  src/cea708.c
  src/caption.c
  src/eia608.c
  src/eia608_charmap.c
  src/eia608_from_utf8.c
)

set(CAPTION_HEADERS
  caption/avc.h
  caption/caption.h
  caption/cea708.h
  caption/eia608.h
  caption/eia608_charmap.h
  caption/scc.h
  caption/srt.h
  caption/utf8.h
  caption/xds.h
)

add_library(caption ${CAPTION_SOURCES})

if(ENABLE_RE2C)
  add_dependencies(caption re2c)
endif()

if(CMAKE_VERSION VERSION_EQUAL 2.8.12 OR CMAKE_VERSION VERSION_GREATER 2.8.12)
target_include_directories(caption PUBLIC ${CMAKE_CURRENT_SOURCE_DIR})
endif()

option(BUILD_EXAMPLES "Build examples" ON)
if(BUILD_EXAMPLES)
  add_subdirectory(examples)
endif()

# unit-tests
#add_executable(eia608_test unit_tests/eia608_test.c )
#target_link_libraries(eia608_test caption)

#add_executable(test_captions unit_tests/test_sei.c )
#target_link_libraries(test_captions caption)

install (TARGETS caption DESTINATION lib EXPORT caption-targets)
install (FILES ${CAPTION_HEADERS} DESTINATION include/caption)

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