cmake_minimum_required(VERSION 3.24)

set(PROJECT_NAME Sentinal)
project(${PROJECT_NAME} LANGUAGES CXX)

set(project_version_major 0)
set(project_version_minor 0)
set(project_version_patch 1)
set(project_version_tweak 0)

set(CMAKE_CXX_STANDARD 23)
set(CMAKE_CXX_STANDARD_REQUIRED ON)

# Make sure this is here for nvim and fleet users
set(CMAKE_EXPORT_COMPILE_COMMANDS ON)

# # # # # # # # # # # #
# Manage Dependencies #
# # # # # # # # # # # #

include(ExternalProject)

ExternalProject_Add(
  imgui
  GIT_REPOSITORY https://github.com/ocornut/imgui.git
  GIT_TAG master
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ""
  BUILD_COMMAND ""
  INSTALL_COMMAND ""
  BUILD_IN_SOURCE 1
)

ExternalProject_Get_Property(imgui source_dir)
file(GLOB imgui_sources
    "${source_dir}/*.cpp"
    "${source_dir}/*.h"
)

add_library(imgui STATIC ${imgui_sources})
target_include_directories(imgui PUBLIC ${source_dir})

ExternalProject_Add(
  ffmpeg
  GIT_REPOSITORY https://github.com/FFmpeg/FFmpeg.git
  GIT_TAG master
  UPDATE_COMMAND ""
  CONFIGURE_COMMAND ./configure --prefix=<INSTALL_DIR> --enable-shared --disable-static
  BUILD_COMMAND make
  INSTALL_COMMAND make install
  BUILD_IN_SOURCE 1
)

ExternalProject_Get_Property(ffmpeg install_dir)

set(FFMPEG_INCLUDE_DIR ${install_dir}/include)
set(FFMPEG_LIB_DIR ${install_dir}/lib)
set(FFMPEG_BIN_DIR ${install_dir}/bin)

add_library(avcodec SHARED IMPORTED)
set_target_properties(avcodec PROPERTIES
  IMPORTED_LOCATION ${FFMPEG_LIB_DIR}/libavcodec.so
  INTERFACE_INCLUDE_DIRECTORIES ${FFMPEG_INCLUDE_DIR}
)

add_library(avformat SHARED IMPORTED)
set_target_properties(avformat PROPERTIES
  IMPORTED_LOCATION ${FFMPEG_LIB_DIR}/libavformat.so
  INTERFACE_INCLUDE_DIRECTORIES ${FFMPEG_INCLUDE_DIR}
)

add_library(avutil SHARED IMPORTED)
set_target_properties(avutil PROPERTIES
  IMPORTED_LOCATION ${FFMPEG_LIB_DIR}/libavutil.so
  INTERFACE_INCLUDE_DIRECTORIES ${FFMPEG_INCLUDE_DIR}
)

add_library(swscale SHARED IMPORTED)
set_target_properties(swscale PROPERTIES
  IMPORTED_LOCATION ${FFMPEG_LIB_DIR}/libswscale.so
  INTERFACE_INCLUDE_DIRECTORIES ${FFMPEG_INCLUDE_DIR}
)

add_library(FFmpeg::avcodec ALIAS avcodec)
add_library(FFmpeg::avformat ALIAS avformat)
add_library(FFmpeg::avutil ALIAS avutil)
add_library(FFmpeg::swscale ALIAS swscale)

# Add GLFW and GLEW as subdirectories if they have their own CMake files
add_subdirectory(thirdparty/glfw)
add_subdirectory(thirdparty/glew-cmake)

# # # # # # # # # # # #
#  Dependencies Done  #
# # # # # # # # # # # #


if(APPLE)
    list(APPEND EXTRA_LIBS "-framework OpenGL")
elseif(WIN32)
    find_package(OpenGL REQUIRED)
else()
    list(APPEND EXTRA_LIBS "-lGL -lGLU -lX11")
endif()

# ImGui glfw backends (GLFW + OpenGL3)
add_library(imgui_impl STATIC
    thirdparty/imgui/backends/imgui_impl_glfw.cpp
    thirdparty/imgui/backends/imgui_impl_opengl3.cpp
)

target_include_directories(imgui_impl PRIVATE
    thirdparty/imgui
    thirdparty/imgui/backends
    thirdparty/glfw/include
)

include_directories(
    thirdparty/imgui
    thirdparty/imgui/backends
    thirdparty/glfw/include
    thirdparty/glew-cmake/include
)

set(glew-cmake_BUILD_SHARED OFF)
set(glew-cmake_BUILD_STATIC ON)

add_executable(${PROJECT_NAME} src/main.cpp)

target_link_libraries(${PROJECT_NAME} PRIVATE imgui FFmpeg::avcodec FFmpeg::avformat FFmpeg::avutil FFmpeg::swscale glfw glew)

add_dependencies(${PROJECT_NAME} ffmpeg)

set_target_properties(${PROJECT_NAME} PROPERTIES
    RUNTIME_OUTPUT_DIRECTORY "${CMAKE_BINARY_DIR}/bin"
)