cmake_minimum_required(VERSION 3.9)
project(libass C)

set(LIBASS_VERSION 0.17.1)

include_directories(${CMAKE_CURRENT_SOURCE_DIR} ${CMAKE_CURRENT_BINARY_DIR})

set(CONFIG_FREETYPE 1)
set(CONFIG_FRIBIDI 1)
set(CONFIG_HARFBUZZ 1)

file(GLOB_RECURSE SOURCES ${CMAKE_CURRENT_SOURCE_DIR}/libass/*.c)

set(PKG_REQUIRES_LIBASS "harfbuzz >= 1.2.3, fribidi >= 0.19.1, freetype2 >= 9.17.3")
set(PKG_LIBS_LIBASS)
if(WIN32)
  set(CONFIG_DIRECTWRITE 1)
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_coretext.c$")
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_fontconfig.c$")

  #dependency fribidi does not support uwp builds, link gdi32 directly
  set(FONT_LIBRARY gdi32)
  set(PKG_LIBS_LIBASS -lgdi32)
elseif(APPLE)
  set(CONFIG_CORETEXT 1)
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_directwrite.c$")
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_fontconfig.c$")

  include(CheckCSourceCompiles)
  check_c_source_compiles(
    "
    #include <ApplicationServices/ApplicationServices.h>
    int main(void){
      CTFontDescriptorCopyAttribute(NULL, kCTFontURLAttribute);
      return 0;
    }
    "
    CHECK_OLD_OSX
  )
  if(CHECK_OLD_OSX)
    set(FONT_LIBRARY "-framework ApplicationServices -framework CoreFoundation")
    set(PKG_LIBS_LIBASS "-framework ApplicationServices -framework CoreFoundation")
  else()
    set(FONT_LIBRARY "-framework CoreText -framework CoreFoundation")
    set(PKG_LIBS_LIBASS "-framework CoreText -framework CoreFoundation")
  endif()
elseif(${CMAKE_SYSTEM_NAME} MATCHES "Linux")
  set(CONFIG_FONTCONFIG 1)
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_coretext.c$")
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_directwrite.c$")

  find_package(Fontconfig REQUIRED)
  set(FONT_LIBRARY Fontconfig::Fontconfig)
  set(PKG_REQUIRES_LIBASS "fontconfig >= 2.10.92, ${PKG_REQUIRES_LIBASS}")
else()
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_directwrite.c$")
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_coretext.c$")
  list(FILTER SOURCES EXCLUDE REGEX ".*ass_fontconfig.c$")
endif()

if(NOT WIN32)
  set(PKG_LIBS_LIBASS "${PKG_LIBS_LIBASS} -lm")
endif()

find_package(Freetype REQUIRED)

find_package(PkgConfig REQUIRED)
pkg_check_modules(FRIBIDI REQUIRED IMPORTED_TARGET fribidi)
pkg_check_modules(HARFBUZZ REQUIRED IMPORTED_TARGET harfbuzz)

# libass use win32 api to open files on windows since https://github.com/libass/libass/commit/f664ced049394e2a5d4300ba526e206df73ec729
# so remove dependency dirent.

configure_file(${CMAKE_CURRENT_SOURCE_DIR}/config.h.in config.h)

add_library(ass ${SOURCES} ${CMAKE_CURRENT_SOURCE_DIR}/libass.def)

target_include_directories(ass PRIVATE
  PkgConfig::FRIBIDI
  PkgConfig::HARFBUZZ)
target_link_libraries(ass PRIVATE
  Freetype::Freetype
  PkgConfig::FRIBIDI
  PkgConfig::HARFBUZZ
  ${FONT_LIBRARY})

install(TARGETS ass
  RUNTIME DESTINATION bin
  LIBRARY DESTINATION lib
  ARCHIVE DESTINATION lib)

# pkgconfig file
set(prefix ${CMAKE_INSTALL_PREFIX})
set(exec_prefix ${CMAKE_INSTALL_PREFIX})
set(libdir ${CMAKE_INSTALL_PREFIX}/lib)
set(includedir ${CMAKE_INSTALL_PREFIX}/include)
set(PACKAGE_VERSION ${LIBASS_VERSION})
if(BUILD_SHARED_LIBS)
  set(PKG_REQUIRES_PUBLIC ${PKG_REQUIRES_LIBASS})
  set(PKG_LIBS_PUBLIC ${PKG_LIBS_LIBASS})
else()
  set(PKG_REQUIRES_PRIVATE ${PKG_REQUIRES_LIBASS})
  set(PKG_LIBS_PRIVATE ${PKG_LIBS_LIBASS})
endif()
configure_file(libass.pc.in libass.pc @ONLY)
install(FILES
        ${CMAKE_CURRENT_BINARY_DIR}/libass.pc
        DESTINATION ${CMAKE_INSTALL_LIBDIR}/pkgconfig)