#
# This file is part of AtomVM.
#
# Copyright 2022 Davide Bettio <davide@uninstall.it>
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#    http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
#
# SPDX-License-Identifier: Apache-2.0 OR LGPL-2.1-or-later
#

cmake_minimum_required (VERSION 3.13)
include($ENV{IDF_PATH}/tools/cmake/project.cmake)

# Don't try to link when testing availability of functions
set(CMAKE_TRY_COMPILE_TARGET_TYPE "STATIC_LIBRARY")

# mkfifo is defined in newlib header but not implemented
set(HAVE_MKFIFO "" CACHE INTERNAL "Have symbol mkfifo" FORCE)
# Likewise with EXECVE
set(HAVE_EXECVE "" CACHE INTERNAL "Have symbol execve" FORCE)
# kill links to a newlib stub but there are no OS processes to signal
set(HAVE_KILL "" CACHE INTERNAL "Have symbol kill" FORCE)
# Force HAVE_SOCKET
# Automatically detecting it requires to put too many components include dirs
# in CMAKE_REQUIRED_INCLUDES as lwip includes freetos and many esp system components
set(HAVE_SOCKET 1 CACHE INTERNAL "Have symbol socket" FORCE)

# opendir, closedir and readdir functions are not detected
# but they are available
set(HAVE_OPENDIR 1 CACHE INTERNAL "Have symbol opendir" FORCE)
set(HAVE_CLOSEDIR 1 CACHE INTERNAL "Have symbol closedir" FORCE)
set(HAVE_READDIR 1 CACHE INTERNAL "Have symbol readdir" FORCE)

list(APPEND CMAKE_MODULE_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../CMakeModules")

# Disable SMP with esp32 socs that have only one core
if (${IDF_TARGET} MATCHES "esp32s2|esp32c2|esp32c3|esp32c5|esp32c6|esp32c61|esp32h2")
    message("Disabling SMP as selected target only has one core")
    set(AVM_DISABLE_SMP YES FORCE)
    set(HAVE_PLATFORM_ATOMIC_H ON)
endif()

# ESP32-C5 has limited flash space, use minimal opcodes to reduce VM size
if (${IDF_TARGET} STREQUAL "esp32c5" AND NOT DEFINED AVM_MINIMAL_OPCODES)
    message(STATUS "Enabling minimal opcodes for ${IDF_TARGET} to reduce binary size")
    set(AVM_MINIMAL_OPCODES ON)
endif()

# On Esp32, select is run in a loop in a dedicated task
set(AVM_SELECT_IN_TASK ON)

## Configure partition table based on boot flavor and JIT
# Detect JIT from existing sdkconfig before project() where CONFIG_* is not yet available.
set(_jit_partition NO)
if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig")
    file(STRINGS "${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig" _sdkconfig_lines)
    if("CONFIG_JIT_ENABLED=y" IN_LIST _sdkconfig_lines)
        set(_jit_partition YES)
    endif()
endif()

if (_jit_partition)
    # JIT partition layout: fully AOT boot.avm (estdlib + esp32init, no JIT compiler)
    set(AVM_PARTITION_TABLE_FILENAME "partitions-jit.csv")
elseif (ATOMVM_ELIXIR_SUPPORT)
    set(AVM_PARTITION_TABLE_FILENAME "partitions-elixir.csv")
else()
    set(AVM_PARTITION_TABLE_FILENAME "partitions.csv")
endif()

# Sync partition table in sdkconfig so that IDF uses the correct partition layout.
# sdkconfig treats its settings as user values that override defaults, so writing
# sdkconfig.defaults alone is not enough, we must patch sdkconfig directly.
# Only write when the value actually differs to avoid spurious timestamp changes.
if(EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig")
    file(READ "${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig" _sdkconfig_content)
    if(NOT _sdkconfig_content MATCHES "CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=\"${AVM_PARTITION_TABLE_FILENAME}\"")
        string(REGEX REPLACE
            "(CONFIG_PARTITION_TABLE_CUSTOM_FILENAME=)[^\n]*"
            "\\1\"${AVM_PARTITION_TABLE_FILENAME}\""
            _sdkconfig_content "${_sdkconfig_content}")
        string(REGEX REPLACE
            "(CONFIG_PARTITION_TABLE_FILENAME=)[^\n]*"
            "\\1\"${AVM_PARTITION_TABLE_FILENAME}\""
            _sdkconfig_content "${_sdkconfig_content}")
        file(WRITE "${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig" "${_sdkconfig_content}")
        message(STATUS "Updated sdkconfig partition table to ${AVM_PARTITION_TABLE_FILENAME}")
    endif()
endif()

if (ATOMVM_RELEASE)
    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig.release-defaults.in ${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig.defaults @ONLY)
else()
    configure_file(${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig.defaults.in ${CMAKE_CURRENT_SOURCE_DIR}/sdkconfig.defaults @ONLY)
endif()

project(atomvm-esp32)

# JIT configuration is handled in components/libatomvm/CMakeLists.txt after
# idf_component_register, where CONFIG_* variables are available.

# esp-idf does not use compile_feature but instead sets version in
# c_compile_options
# Ensure project is compiled with at least C11
idf_build_get_property(c_compile_options C_COMPILE_OPTIONS)
if (-std=gnu99 IN_LIST c_compile_options )
    list(REMOVE_ITEM c_compile_options -std=gnu99)
    list(APPEND c_compile_options -std=gnu11)
    idf_build_set_property(C_COMPILE_OPTIONS ${c_compile_options})
endif()

# Options that make sense for this platform
option(AVM_DISABLE_SMP "Disable SMP." OFF)
option(AVM_USE_32BIT_FLOAT "Use 32 bit floats." OFF)
option(AVM_VERBOSE_ABORT "Print module and line number on VM abort" OFF)
option(AVM_CREATE_STACKTRACES "Create stacktraces" ON)
option(AVM_PRINT_PROCESS_CRASH_DUMPS "Print crash reports when processes die with non-standard reasons" ON)
option(AVM_USE_LIBSODIUM "Enable optional libsodium backend for Ed25519 curve" OFF)
option(AVM_MINIMAL_OPCODES "Reduce VM size by excluding opcodes for optional compiler flags (no_bs_match, no_ssa_opt_bs_ensure)" OFF)

add_subdirectory(tools)

include(GetBootAVM.cmake)
message(STATUS "-- Configuring atomvmlib esp32boot flavor: ${BOOT_LIBS}")
if (NOT ("${BOOT_LIBS}" STREQUAL "NONE"))
    set(BOOT_LIB_PATH "${CMAKE_CURRENT_SOURCE_DIR}/../../../build/libs/esp32boot/${BOOT_LIBS}")
    if (NOT EXISTS "${BOOT_LIB_PATH}")
        message(WARNING "A generic_unix build must be done first in the top level AtomVM/build directory! \n\
        Consult https://doc.atomvm.org/main/build-instructions.html for build instructions.")
    else()
        partition_table_get_partition_info(lib_offset "--partition-name boot.avm" "offset")
        esptool_py_flash_target_image(flash boot.avm "${lib_offset}" "${BOOT_LIB_PATH}")
    endif()
endif()

if (EXISTS "${CMAKE_CURRENT_SOURCE_DIR}/nvs_partition.csv")
    nvs_create_partition_image(nvs "${CMAKE_CURRENT_SOURCE_DIR}/nvs_partition.csv")
endif()
