cmake_minimum_required(VERSION 3.20)

project(hdk-imgui-sdl-renderer 
  VERSION 0.0.1
  LANGUAGES CXX
)

option(HDK_IMGUI_SDL_RENDERER_TESTS "Build hdk-imgui-sdl-renderer tests" ${HDK_TESTS})
option(HDK_IMGUI_SDL_RENDERER_EXAMPLES "Build hdk-imgui-sdl-renderer examples" ${HDK_EXAMPLES})

if(DEFINED HDK_USE_SYSTEM_DEPS)
  set(_hdk_is3r_use_system_default ${HDK_USE_SYSTEM_DEPS})
else()
  set(_hdk_is3r_use_system_default ON)
endif()

if(DEFINED HDK_CMAKE_POLICY_DIR AND EXISTS "${HDK_CMAKE_POLICY_DIR}/HDKDependencyPolicy.cmake")
  include("${HDK_CMAKE_POLICY_DIR}/HDKDependencyPolicy.cmake")
elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/../cmake/HDKDependencyPolicy.cmake")
  include("${CMAKE_CURRENT_SOURCE_DIR}/../cmake/HDKDependencyPolicy.cmake")
elseif(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/cmake/HDKDependencyPolicy.cmake")
  include("${CMAKE_CURRENT_SOURCE_DIR}/cmake/HDKDependencyPolicy.cmake")
else()
  message(FATAL_ERROR "Unable to locate HDKDependencyPolicy.cmake")
endif()

option(HDK_IS3R_SYSTEM_SDL3 "Prefer system SDL3 before FetchContent fallback" ${_hdk_is3r_use_system_default})
option(HDK_IS3R_FETCH_SDL3_FALLBACK "Fetch SDL3 when a suitable system package is unavailable" ON)
option(HDK_IS3R_SYSTEM_HDK_SDL "Prefer system hdk-sdl before FetchContent fallback" ${_hdk_is3r_use_system_default})
option(HDK_IS3R_FETCH_HDK_SDL_FALLBACK "Fetch hdk-sdl when a suitable system package is unavailable" ON)

if(DEFINED HDK_SDL3_MIN_VERSION)
  set(_hdk_is3r_min_sdl3_version_default "${HDK_SDL3_MIN_VERSION}")
else()
  set(_hdk_is3r_min_sdl3_version_default "3.4.8")
endif()

if(DEFINED HDK_SDL_MIN_VERSION)
  set(_hdk_is3r_min_sdl_version_default "${HDK_SDL_MIN_VERSION}")
else()
  set(_hdk_is3r_min_sdl_version_default "0.0.1")
endif()

if(DEFINED HDK_SDL_GIT_REPOSITORY)
  set(_hdk_is3r_sdl_repo_default "${HDK_SDL_GIT_REPOSITORY}")
else()
  set(_hdk_is3r_sdl_repo_default "https://git.ufp.institute/ufp/hdk-sdl.git")
endif()

set(HDK_IS3R_MIN_SDL3_VERSION "${_hdk_is3r_min_sdl3_version_default}" CACHE STRING "Minimum SDL3 version for system package resolution")
set(HDK_IS3R_MIN_HDK_SDL_VERSION "${_hdk_is3r_min_sdl_version_default}" CACHE STRING "Minimum hdk-sdl version for system package resolution")
set(HDK_IS3R_HDK_SDL_GIT_REPOSITORY "${_hdk_is3r_sdl_repo_default}" CACHE STRING "Git repository used to fetch hdk-sdl when package resolution fails")
set(HDK_IS3R_HDK_SDL_GIT_TAG "v${HDK_IS3R_MIN_HDK_SDL_VERSION}" CACHE STRING "Git tag used to fetch hdk-sdl fallback")

if(HDK_IMGUI_SDL_RENDERER_EXAMPLES)
  add_subdirectory(examples)
endif()

if(HDK_IMGUI_SDL_RENDERER_TESTS)
  add_subdirectory(tests)
endif()

hdk_resolve_dependency(
  NAME hdk-sdl
  TARGETS hdk::hdk-sdl hdk-sdl
  PACKAGE_NAMES hdk-sdl
  MIN_VERSION ${HDK_IS3R_MIN_HDK_SDL_VERSION}
  USE_SYSTEM ${HDK_IS3R_SYSTEM_HDK_SDL}
  FETCH_FALLBACK ${HDK_IS3R_FETCH_HDK_SDL_FALLBACK}
  GIT_REPOSITORY ${HDK_IS3R_HDK_SDL_GIT_REPOSITORY}
  GIT_TAG ${HDK_IS3R_HDK_SDL_GIT_TAG}
  FETCHCONTENT_NAME hdk-sdl
)

if(TARGET hdk-sdl AND NOT TARGET hdk::hdk-sdl)
  add_library(hdk::hdk-sdl ALIAS hdk-sdl)
endif()

set(_hdk_is3r_need_fetch_sdl3 ON)
if(TARGET SDL3::SDL3)
  set(_hdk_is3r_need_fetch_sdl3 OFF)
elseif(HDK_IS3R_SYSTEM_SDL3)
  find_package(SDL3 ${HDK_IS3R_MIN_SDL3_VERSION} QUIET CONFIG)
  if(SDL3_FOUND)
    set(_hdk_is3r_need_fetch_sdl3 OFF)
  elseif(NOT HDK_IS3R_FETCH_SDL3_FALLBACK)
    message(FATAL_ERROR "SDL3 >= ${HDK_IS3R_MIN_SDL3_VERSION} not found and HDK_IS3R_FETCH_SDL3_FALLBACK=OFF")
  endif()
endif()

if(_hdk_is3r_need_fetch_sdl3)
  set(SDL_TEST OFF CACHE BOOL "Disable SDL tests" FORCE)
  set(SDL_EXAMPLES OFF CACHE BOOL "Disable SDL examples" FORCE)
  set(SDL_INSTALL OFF CACHE BOOL "Disable SDL install" FORCE)

  include(FetchContent)
  FetchContent_Declare(
    SDL3
    GIT_REPOSITORY https://github.com/libsdl-org/SDL.git
    GIT_TAG release-${HDK_IS3R_MIN_SDL3_VERSION}
  )
  FetchContent_MakeAvailable(SDL3)
endif()

include(FetchContent)
FetchContent_Declare(imgui
  GIT_REPOSITORY https://github.com/ocornut/imgui
  GIT_TAG docking
)
FetchContent_MakeAvailable(imgui)

set(HDK_IS3R_SOURCES
  ${imgui_SOURCE_DIR}/imgui.cpp
  ${imgui_SOURCE_DIR}/imgui_demo.cpp
  ${imgui_SOURCE_DIR}/imgui_draw.cpp
  ${imgui_SOURCE_DIR}/imgui_tables.cpp
  ${imgui_SOURCE_DIR}/imgui_widgets.cpp
  ${imgui_SOURCE_DIR}/backends/imgui_impl_sdl3.cpp
  ${imgui_SOURCE_DIR}/backends/imgui_impl_sdlrenderer3.cpp
)

add_library(hdk-is3r STATIC ${HDK_IS3R_SOURCES})
target_link_libraries(hdk-is3r PUBLIC hdk::hdk-sdl SDL3::SDL3)
target_include_directories(hdk-is3r PUBLIC
  $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
  $<BUILD_INTERFACE:${imgui_SOURCE_DIR}>
  $<BUILD_INTERFACE:${imgui_SOURCE_DIR}/backends>
  $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
)

target_compile_features(hdk-is3r PUBLIC cxx_std_17)
include(GNUInstallDirs)

install(TARGETS hdk-is3r
  EXPORT hdk-is3rTargets
  ARCHIVE DESTINATION ${CMAKE_INSTALL_LIBDIR}
  LIBRARY DESTINATION ${CMAKE_INSTALL_LIBDIR}
  RUNTIME DESTINATION ${CMAKE_INSTALL_BINDIR}
  COMPONENT hdk-imgui-sdl-renderer_dev
)

install(DIRECTORY ${CMAKE_CURRENT_SOURCE_DIR}/include/
  DESTINATION ${CMAKE_INSTALL_INCLUDEDIR}
  COMPONENT hdk-imgui-sdl-renderer_dev
)

# Documentation Policy
include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/HDKDocumentationPolicy.cmake)

set(hdk-imgui-sdl-renderer_DEBIAN_DEPENDS "hdk-sdl-dev (>= ${HDK_IS3R_MIN_HDK_SDL_VERSION})")

# CPack Packaging Policy
include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/HDKPackaging.cmake)