# Emscripten toolchain for SCOLDEPS WebAssembly builds
cmake_minimum_required(VERSION 3.6)

# Define Emscripten platform
set(EMSCRIPTEN True)
set(CMAKE_SYSTEM_NAME Emscripten)
set(CMAKE_SYSTEM_VERSION 1)
set(CMAKE_SYSTEM_PROCESSOR wasm)

# Include Emscripten's platform module
include("$ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cmake/Modules/Platform/Emscripten.cmake")

# Set installation prefix
set(SCOL_INSTALL_PREFIX "emscripten")

# Specify Emscripten compilers and tools
set(CMAKE_C_COMPILER emcc)
set(CMAKE_CXX_COMPILER em++)
set(CMAKE_AR emar CACHE FILEPATH "Archiver")
set(CMAKE_RANLIB emranlib CACHE FILEPATH "Ranlib")
set(CMAKE_LINKER emcc CACHE FILEPATH "Linker")

set(CMAKE_CXX_STANDARD 14)
set(CMAKE_CXX_STANDARD_REQUIRED ON)
set(CMAKE_CXX_EXTENSIONS OFF)

# Set find root path to Emscripten's sysroot
set(CMAKE_FIND_ROOT_PATH $ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cache/sysroot)
list(APPEND CMAKE_FIND_ROOT_PATH
    $ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cache/sysroot/lib
    $ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cache/sysroot/usr/lib
    $ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cache/sysroot/include
)

# Restrict find_xxx() to Emscripten sysroot
set(CMAKE_FIND_ROOT_PATH_MODE_PROGRAM NEVER)
set(CMAKE_FIND_ROOT_PATH_MODE_LIBRARY ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_INCLUDE ONLY)
set(CMAKE_FIND_ROOT_PATH_MODE_PACKAGE ONLY)

# Configure pkg-config for Emscripten
set(ENV{PKG_CONFIG_PATH} "$ENV{SCOL_DEPENDENCIES_PATH}/emsdk/upstream/emscripten/cache/sysroot/lib/pkgconfig")

# Compiler flags with explicit sysroot include
set(CMAKE_C_FLAGS "-O3 -fsigned-char -s USE_PTHREADS=1 -s WASM=1 -s FULL_ES3=1 -s ALLOW_MEMORY_GROWTH=1 -Wno-error=maybe-uninitialized -Wno-error=uninitialized" CACHE STRING "C flags")
set(CMAKE_CXX_FLAGS "-O3 -fsigned-char -s USE_PTHREADS=1 -s WASM=1 -s FULL_ES3=1 -s ALLOW_MEMORY_GROWTH=1 -Wno-error=maybe-uninitialized -Wno-error=uninitialized -std=c++11" CACHE STRING "C++ flags")

# Build type specific flags
set(CMAKE_C_FLAGS_RELEASE "-O3 -DNDEBUG" CACHE STRING "C Release flags")
set(CMAKE_CXX_FLAGS_RELEASE "-O3 -DNDEBUG" CACHE STRING "C++ Release flags")
set(CMAKE_C_FLAGS_DEBUG "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "C Debug flags")
set(CMAKE_CXX_FLAGS_DEBUG "-O0 -g -DDEBUG -D_DEBUG" CACHE STRING "C++ Debug flags")

# Linker flags with ports
# -s USE_ZLIB=1 -s USE_LIBPNG=1 -s USE_FREETYPE=1
set(CMAKE_EXE_LINKER_FLAGS "-s EXPORTED_FUNCTIONS=_main,_malloc,_free -s EXPORTED_RUNTIME_METHODS=ccall,cwrap -s MODULARIZE=1 -s EXPORT_NAME=Module" CACHE STRING "Executable linker flags")
set(CMAKE_SHARED_LINKER_FLAGS "-s EXPORTED_FUNCTIONS=_malloc,_free -s MODULARIZE=1" CACHE STRING "Shared library linker flags")

# Library and executable suffixes
set(CMAKE_EXECUTABLE_SUFFIX ".mjs" CACHE STRING "Executable suffix")
set(CMAKE_STATIC_LIBRARY_SUFFIX ".a" CACHE STRING "Static library suffix")
set(CMAKE_SHARED_LIBRARY_SUFFIX ".wasm" CACHE STRING "Shared library suffix")
set(CMAKE_FIND_LIBRARY_SUFFIXES .a .wasm)

# Prefer static libraries
set(CMAKE_FIND_LIBRARY_PREFIXES "" "lib")

# Define platform macros
add_definitions(-DEMSCRIPTEN -D__EMSCRIPTEN__)

# Skip RPATH for WebAssembly
set(CMAKE_SKIP_RPATH 1)

# Ensure static libraries are not forced to bitcode
set(EMSCRIPTEN_GENERATE_BITCODE_STATIC_LIBRARIES OFF CACHE BOOL "Generate bitcode for static libraries" FORCE)

# Enable verbose output for debugging
set(CMAKE_VERBOSE_MAKEFILE ON CACHE BOOL "Verbose output" FORCE)