# Copyright (c) 2010, Christian Stimming
# Copyright (c) 2018, Geert Janssens

# Redistribution and use is allowed according to the terms of the BSD license.
# For details see the accompanying COPYING-CMAKE-SCRIPTS file.

# gnc_add_swig_guile_command is used to generate guile swig wrappers
# - _target is the name of a global target that will be set for this wrapper file,
#    this can be used elsewhere to create a dependency on this wrapper
# - _out_var will be set to the full path to the generated wrapper file
# - _output is the name of the wrapper file to generate
# - _input is the swig interface file (*.i) to generate this wrapper from
# - _include_dirs is an optional list of include directories to pass to the swig command
#    For guile two directories are always passed by default:
#    ${CMAKE_SOURCE_DIR}/common and ${CMAKE_SOURCE_DIR}/libgnucash/engine
# Any additional parameters will be used as dependencies for this wrapper target
macro (gnc_add_swig_guile_command _target _out_var _output _input _include_dirs)

    set(SW_CURR_BUILD_SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR})
    set(SW_BUILD_SOURCE_DIR ${CMAKE_BINARY_DIR})
    set(outfile ${SW_CURR_BUILD_SOURCE_DIR}/${_output})
    set(${_out_var} ${outfile}) # This variable is set for convenience to use in the calling CMakeLists.txt


    set (DEFAULT_SWIG_GUILE_FLAGS
        -guile -Linkage module
        ${SWIG_ARGS}
    )
    set (DEFAULT_SWIG_GUILE_C_INCLUDES
        ${CMAKE_SOURCE_DIR}/common
        ${CMAKE_SOURCE_DIR}/libgnucash/engine
    )
    set (GUILE_SWIG_FLAGS ${DEFAULT_SWIG_GUILE_FLAGS})
    foreach (dir ${DEFAULT_SWIG_GUILE_C_INCLUDES} ${_include_dirs})
        list (APPEND GUILE_SWIG_FLAGS "-I${dir}")
    endforeach (dir)

    add_custom_command (
        OUTPUT ${outfile}
        DEPENDS ${_input} ${CMAKE_SOURCE_DIR}/common/base-typemaps.i ${ARGN}
        COMMAND ${SWIG_EXECUTABLE} ${GUILE_SWIG_FLAGS}  -o ${outfile} ${_input}
    )
    add_custom_target(${_target} DEPENDS ${outfile})
endmacro (gnc_add_swig_guile_command)


# gnc_add_swig_python_command is used to generate python swig wrappers
# from the tarball will be used instead
# - _target is the name of a global target that will be set for this wrapper file,
#    this can be used elsewhere to create a dependency on this wrapper
# - _out_var will be set to the full path to the generated wrapper file
# - _py_out_var is the same but for the python module that's generated together with the wrapper
# - _output is the name of the wrapper file to generate
# - _py_output is the name of the python module associated with this wrapper
# - _input is the swig interface file (*.i) to generate this wrapper from
# - _include_dirs is an optional list of include directories to pass to the swig command
#    For python four directories are always passed by default:
#    ${GLIB2_INCLUDE_DIRS}, ${CMAKE_SOURCE_DIR}/common,
#    ${CMAKE_SOURCE_DIR}/libgnucash/app-utils and ${CMAKE_SOURCE_DIR}/libgnucash/engine
# Any additional parameters will be used as dependencies for this wrapper target
macro (gnc_add_swig_python_command _target _out_var _py_out_var _output _py_output _input _include_dirs)

    set(SW_CURR_BUILD_SOURCE_DIR ${CMAKE_CURRENT_BINARY_DIR})
    set(SW_BUILD_SOURCE_DIR ${CMAKE_BINARY_DIR})
    set(outfile ${SW_CURR_BUILD_SOURCE_DIR}/${_output})
    set(${_out_var} ${outfile}) # This variable is set for convenience to use in the calling CMakeLists.txt

    set(py_outfile ${SW_CURR_BUILD_SOURCE_DIR}/${_py_output})
    set(${_py_out_var} ${py_outfile}) # This variable is set for convenience to use in the calling CMakeLists.txt

    set (DEFAULT_SWIG_PYTHON_FLAGS
        -python -py3
        -Wall -Werror
        ${SWIG_ARGS}
        )
    set (DEFAULT_SWIG_PYTHON_C_INCLUDES
         ${GLIB2_INCLUDE_DIRS}
         ${CMAKE_SOURCE_DIR}/common
         ${CMAKE_SOURCE_DIR}/libgnucash/engine
         ${CMAKE_SOURCE_DIR}/libgnucash/app-utils
       	 ${CMAKE_SOURCE_DIR}/bindings
       	 ${CMAKE_SOURCE_DIR}/bindings/python
	 )

    set (PYTHON_SWIG_FLAGS ${DEFAULT_SWIG_PYTHON_FLAGS})
    foreach (dir ${DEFAULT_SWIG_PYTHON_C_INCLUDES} ${_include_dirs})
        list (APPEND PYTHON_SWIG_FLAGS "-I${dir}")
    endforeach (dir)
    add_custom_command(OUTPUT ${outfile} ${py_outfile}
        COMMAND ${SWIG_EXECUTABLE} ${PYTHON_SWIG_FLAGS} -o ${outfile} ${_input}
        DEPENDS ${_input} ${CMAKE_SOURCE_DIR}/common/base-typemaps.i ${ARGN}
        )
    add_custom_target(${_target} ALL DEPENDS ${outfile} ${py_outfile}
        ${CMAKE_SOURCE_DIR}/common/base-typemaps.i ${_input} ${ARGN})
endmacro()


# The swig wrappers need to know the header files ("the interface")
# for the library they are wrapping.
# We can extract those from the target's SOURCES property
# Using a few ordinary cmake commands
macro (gnc_swig_extract_header_files _target _variable)
    set(${_variable} "")
    get_target_property(_headers ${_target} SOURCES)
    if(_headers)
        list(FILTER _headers INCLUDE REGEX ".*[.]h(pp)?$")
        get_target_property(_srcdir ${_target} SOURCE_DIR)
        foreach (_header  ${_headers})
            if(NOT IS_ABSOLUTE "${_header}")
                set(_header_abs "${_srcdir}/${_header}")
            else()
                set(_header_abs "${_header}")
            endif()
            list (APPEND ${_variable} "${_header_abs}")
        endforeach ()
    endif()
endmacro()