# The Flutter tooling requires that developers have a version of Visual Studio
# installed that includes CMake 3.14 or later. 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 3.14)

# Project-level configuration.
set(PROJECT_NAME "heic2png")
project(${PROJECT_NAME} LANGUAGES CXX)

# Explicitly opt in to modern CMake behaviors to avoid warnings with recent
# versions of CMake.
cmake_policy(VERSION 3.14...3.25)

# This value is used when generating builds using this plugin, so it must
# not be changed
set(PLUGIN_NAME "heic2png_plugin")

# --- Bundled native dependencies (libheif, libde265, libpng, zlib) ---
set(THIRD_PARTY_DIR "${CMAKE_CURRENT_SOURCE_DIR}/third_party")

if(NOT EXISTS "${THIRD_PARTY_DIR}/include/libheif/heif.h")
  message(FATAL_ERROR
    "Bundled libheif headers not found at ${THIRD_PARTY_DIR}/include/libheif/heif.h\n"
    "Run the build-native-deps CI workflow or scripts/build_native_deps.ps1 to produce them.")
endif()

# Any new source files that you add to the plugin should be added here.
list(APPEND PLUGIN_SOURCES
  "heic2png_plugin.cpp"
  "heic2png_plugin.h"
)

# Define the plugin library target. Its name must not be changed (see comment
# on PLUGIN_NAME above).
add_library(${PLUGIN_NAME} SHARED
  "include/heic2png/heic2png_plugin_c_api.h"
  "heic2png_plugin_c_api.cpp"
  ${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.
target_include_directories(${PLUGIN_NAME} INTERFACE
  "${CMAKE_CURRENT_SOURCE_DIR}/include")
target_include_directories(${PLUGIN_NAME} PRIVATE
  "${THIRD_PARTY_DIR}/include")

target_link_libraries(${PLUGIN_NAME} PRIVATE flutter flutter_wrapper_plugin
  comctl32
  "${THIRD_PARTY_DIR}/lib/heif.lib"
  "${THIRD_PARTY_DIR}/lib/de265.lib"
  "${THIRD_PARTY_DIR}/lib/libpng16.lib"
  "${THIRD_PARTY_DIR}/lib/zlib.lib"
)

# 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.
set(heic2png_bundled_libraries
  "${THIRD_PARTY_DIR}/bin/heif.dll"
  "${THIRD_PARTY_DIR}/bin/de265.dll"
  "${THIRD_PARTY_DIR}/bin/libpng16.dll"
  "${THIRD_PARTY_DIR}/bin/zlib1.dll"
  PARENT_SCOPE
)

# === Tests ===
# These unit tests can be run from a terminal after building the example, or
# from Visual Studio after opening the generated solution file.

# 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})
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 C API is not very useful for unit testing, so build the sources
# directly into the test binary rather than using the DLL.
add_executable(${TEST_RUNNER}
  test/heic2png_plugin_test.cpp
  ${PLUGIN_SOURCES}
)
apply_standard_settings(${TEST_RUNNER})
target_include_directories(${TEST_RUNNER} PRIVATE "${CMAKE_CURRENT_SOURCE_DIR}")
target_include_directories(${TEST_RUNNER} PRIVATE "${THIRD_PARTY_DIR}/include")
target_link_libraries(${TEST_RUNNER} PRIVATE flutter_wrapper_plugin)
target_link_libraries(${TEST_RUNNER} PRIVATE gtest_main gmock)
target_link_libraries(${TEST_RUNNER} PRIVATE comctl32
  "${THIRD_PARTY_DIR}/lib/heif.lib"
  "${THIRD_PARTY_DIR}/lib/de265.lib"
  "${THIRD_PARTY_DIR}/lib/libpng16.lib"
  "${THIRD_PARTY_DIR}/lib/zlib.lib"
)
# flutter_wrapper_plugin has link dependencies on the Flutter DLL.
add_custom_command(TARGET ${TEST_RUNNER} POST_BUILD
  COMMAND ${CMAKE_COMMAND} -E copy_if_different
  "${FLUTTER_LIBRARY}" $<TARGET_FILE_DIR:${TEST_RUNNER}>
)

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