# The Flutter tooling requires that developers have CMake 3.10 or later
# installed. You should not increase this version, as doing so will cause
# the plugin to fail to compile for some customers of the plugin.
cmake_minimum_required(VERSION 3.10)

# Project-level configuration.
set(PROJECT_NAME "heic_native")
project(${PROJECT_NAME} LANGUAGES CXX)

# This value is used when generating builds using this plugin, so it must
# not be changed.
set(PLUGIN_NAME "heic_native_plugin")

# --- Native dependencies: bundled or system ---
set(THIRD_PARTY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/third_party")
set(_BUNDLED_LIBS_FOUND FALSE)

if(EXISTS "${THIRD_PARTY_DIR}/include/libheif/heif.h"
   AND EXISTS "${THIRD_PARTY_DIR}/lib/libheif.so")
  message(STATUS "heic_native: using bundled libheif + libde265")
  set(_BUNDLED_LIBS_FOUND TRUE)
  set(_HEIC_NATIVE_INCLUDE_DIRS "${THIRD_PARTY_DIR}/include")
  set(_HEIC_NATIVE_LIBS
    "${THIRD_PARTY_DIR}/lib/libheif.so"
    "${THIRD_PARTY_DIR}/lib/libde265.so"
  )
endif()

if(NOT _BUNDLED_LIBS_FOUND)
  message(STATUS "heic_native: bundled libs not found, falling back to system pkg-config")
  find_package(PkgConfig REQUIRED)
  pkg_check_modules(LIBHEIF REQUIRED IMPORTED_TARGET libheif)
endif()

# libpng: always use system libpng (virtually always available on Linux).
find_package(PkgConfig REQUIRED)
pkg_check_modules(LIBPNG REQUIRED IMPORTED_TARGET libpng>=1.6.32)

# Any new source files that you add to the plugin should be added here.
list(APPEND PLUGIN_SOURCES
  "heic_native_plugin.cc"
)

# Define the plugin library target. Its name must not be changed (see comment
# on PLUGIN_NAME above).
add_library(${PLUGIN_NAME} SHARED
  ${PLUGIN_SOURCES}
)

# Apply a standard set of build settings that are configured in the
# application-level CMakeLists.txt. This can be removed for plugins that want
# full control over build settings.
apply_standard_settings(${PLUGIN_NAME})

# Symbols are hidden by default to reduce the chance of accidental conflicts
# between plugins. This should not be removed; any symbols that should be
# exported should be explicitly exported with the FLUTTER_PLUGIN_EXPORT macro.
set_target_properties(${PLUGIN_NAME} PROPERTIES
  CXX_VISIBILITY_PRESET hidden)
target_compile_definitions(${PLUGIN_NAME} PRIVATE FLUTTER_PLUGIN_IMPL)

# Source include directories and library dependencies. Add any plugin-specific
# dependencies here.
target_include_directories(${PLUGIN_NAME} INTERFACE
  "${CMAKE_CURRENT_SOURCE_DIR}/include")

if(_BUNDLED_LIBS_FOUND)
  target_include_directories(${PLUGIN_NAME} PRIVATE ${_HEIC_NATIVE_INCLUDE_DIRS})
  target_link_libraries(${PLUGIN_NAME} PRIVATE flutter ${_HEIC_NATIVE_LIBS})
else()
  target_link_libraries(${PLUGIN_NAME} PRIVATE flutter PkgConfig::LIBHEIF)
endif()
target_link_libraries(${PLUGIN_NAME} PRIVATE PkgConfig::LIBPNG)

# List of absolute paths to libraries that should be bundled with the plugin.
# Flutter copies these into the app bundle so they are available at runtime.
if(_BUNDLED_LIBS_FOUND)
  # Bundle the exact libraries needed at link time and runtime (SONAME).
  set(heic_native_bundled_libraries
    "${THIRD_PARTY_DIR}/lib/libheif.so"
    "${THIRD_PARTY_DIR}/lib/libheif.so.1"
    "${THIRD_PARTY_DIR}/lib/libde265.so"
    "${THIRD_PARTY_DIR}/lib/libde265.so.0"
    PARENT_SCOPE
  )
else()
  set(heic_native_bundled_libraries
    ""
    PARENT_SCOPE
  )
endif()

# === Tests ===
# These unit tests can be run from a terminal after building the example.

# Only enable test builds when building the example (which sets this variable)
# so that plugin clients aren't building the tests.
if (${include_${PROJECT_NAME}_tests})
if(${CMAKE_VERSION} VERSION_LESS "3.11.0")
message("Unit tests require CMake 3.11.0 or later")
else()
set(TEST_RUNNER "${PROJECT_NAME}_test")
enable_testing()

# Add the Google Test dependency.
include(FetchContent)
FetchContent_Declare(
  googletest
  URL https://github.com/google/googletest/archive/release-1.11.0.zip
)
# Prevent overriding the parent project's compiler/linker settings
set(gtest_force_shared_crt ON CACHE BOOL "" FORCE)
# Disable install commands for gtest so it doesn't end up in the bundle.
set(INSTALL_GTEST OFF CACHE BOOL "Disable installation of googletest" FORCE)

FetchContent_MakeAvailable(googletest)

# The plugin's exported API is not very useful for unit testing, so build the
# sources directly into the test binary rather than using the shared library.
add_executable(${TEST_RUNNER}
  test/heic_native_plugin_test.cc
  ${PLUGIN_SOURCES}
)
apply_standard_settings(${TEST_RUNNER})
target_include_directories(${TEST_RUNNER} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")

if(_BUNDLED_LIBS_FOUND)
  target_include_directories(${TEST_RUNNER} PRIVATE ${_HEIC_NATIVE_INCLUDE_DIRS})
  target_link_libraries(${TEST_RUNNER} PRIVATE flutter ${_HEIC_NATIVE_LIBS})
else()
  target_link_libraries(${TEST_RUNNER} PRIVATE flutter PkgConfig::LIBHEIF)
endif()
target_link_libraries(${TEST_RUNNER} PRIVATE gtest_main gmock PkgConfig::LIBPNG)

# Enable automatic test discovery.
include(GoogleTest)
gtest_discover_tests(${TEST_RUNNER})

endif()  # CMake version check
endif()  # include_${PROJECT_NAME}_tests
