# This file controls Flutter-level build steps. It should not be edited.
cmake_minimum_required(VERSION 3.10)

set(EPHEMERAL_DIR "${CMAKE_CURRENT_SOURCE_DIR}/ephemeral")

# Configuration provided via flutter tool.
include(${EPHEMERAL_DIR}/generated_config.cmake)

# TODO: Move the rest of this into files in ephemeral. See
# https://github.com/flutter/flutter/issues/57146.

# Serves the same purpose as list(TRANSFORM ... PREPEND ...),
# which isn't available in 3.10.
function(list_prepend LIST_NAME PREFIX)
    set(NEW_LIST "")
    foreach (element ${${LIST_NAME}})
        list(APPEND NEW_LIST "${PREFIX}${element}")
    endforeach (element)
    set(${LIST_NAME} "${NEW_LIST}" PARENT_SCOPE)
endfunction()

# === Flutter Library ===
# System-level dependencies.
find_package(PkgConfig REQUIRED)
pkg_check_modules(GTK REQUIRED IMPORTED_TARGET gtk+-3.0)
pkg_check_modules(GLIB REQUIRED IMPORTED_TARGET glib-2.0)
pkg_check_modules(GIO REQUIRED IMPORTED_TARGET gio-2.0)

set(FLUTTER_LIBRARY "${EPHEMERAL_DIR}/libflutter_linux_gtk.so")

# Published to parent scope for install step.
set(FLUTTER_LIBRARY ${FLUTTER_LIBRARY} PARENT_SCOPE)
set(FLUTTER_ICU_DATA_FILE "${EPHEMERAL_DIR}/icudtl.dat" PARENT_SCOPE)
set(PROJECT_BUILD_DIR "${PROJECT_DIR}/build/" PARENT_SCOPE)
set(AOT_LIBRARY "${PROJECT_DIR}/build/lib/libapp.so" PARENT_SCOPE)

list(APPEND FLUTTER_LIBRARY_HEADERS
        "fl_basic_message_channel.h"
        "fl_binary_codec.h"
        "fl_binary_messenger.h"
        "fl_dart_project.h"
        "fl_engine.h"
        "fl_json_message_codec.h"
        "fl_json_method_codec.h"
        "fl_message_codec.h"
        "fl_method_call.h"
        "fl_method_channel.h"
        "fl_method_codec.h"
        "fl_method_response.h"
        "fl_plugin_registrar.h"
        "fl_plugin_registry.h"
        "fl_standard_message_codec.h"
        "fl_standard_method_codec.h"
        "fl_string_codec.h"
        "fl_value.h"
        "fl_view.h"
        "flutter_linux.h"
        )
list_prepend(FLUTTER_LIBRARY_HEADERS "${EPHEMERAL_DIR}/flutter_linux/")
add_library(flutter INTERFACE)
target_include_directories(flutter INTERFACE
        "${EPHEMERAL_DIR}"
        )
target_link_libraries(flutter INTERFACE "${FLUTTER_LIBRARY}")
target_link_libraries(flutter INTERFACE
        PkgConfig::GTK
        PkgConfig::GLIB
        PkgConfig::GIO
        )
add_dependencies(flutter flutter_assemble)

# === Flutter tool backend ===
# _phony_ is a non-existent file to force this command to run every time,
# since currently there's no way to get a full input/output list from the
# flutter tool.
add_custom_command(
        OUTPUT ${FLUTTER_LIBRARY} ${FLUTTER_LIBRARY_HEADERS}
        ${CMAKE_CURRENT_BINARY_DIR}/_phony_
        COMMAND ${CMAKE_COMMAND} -E env
        ${FLUTTER_TOOL_ENVIRONMENT}
        "${FLUTTER_ROOT}/packages/flutter_tools/bin/tool_backend.sh"
        ${FLUTTER_TARGET_PLATFORM} ${CMAKE_BUILD_TYPE}
        VERBATIM
)
add_custom_target(flutter_assemble DEPENDS
        "${FLUTTER_LIBRARY}"
        ${FLUTTER_LIBRARY_HEADERS}
        )
