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'''
gMathLib, mathematic expressions handling library

 # Python bindings

Author : Guillaume Seguin
Email : guillaume@segu.in

Copyright (c) 2007 Guillaume Seguin <guillaume@segu.in>

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
as published by the Free Software Foundation; either version 2
of the License, or (at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor,
Boston, MA  02110-1301, USA.
'''

ctypedef unsigned int bool

cdef extern from 'string.h':
    ctypedef int size_t
    cdef extern char *strdup (char *s)
    cdef extern void free (void *f)

ctypedef char gchar
cdef extern from "glib.h":
    ctypedef struct GData

cdef extern from "Python.h":
    object PyString_FromStringAndSize (char *string, int size)

cdef struct GMathContext
cdef struct GMathModule
cdef struct GMathFormula
cdef struct GMathTemplate
cdef struct GMathSymbol

cdef struct GMathContext:
    GData        *templates
    GData        *input_modules
    GData        *output_modules

cdef struct GMathFormula:
    GMathContext    *context
    GMathSymbol     *root

cdef struct GMathTemplate:
    bool            has_value
    unsigned int    children_count

cdef struct GMathSymbol:
    gchar           *type
    gchar           *value

    GMathSymbol     **children

    GMathSymbol     *parent

    GMathTemplate   *template
    GMathContext    *context

cdef extern GMathContext* gmathcontext_new ()
cdef extern void gmathcontext_free (GMathContext *context)
cdef extern GMathModule* gmathcontext_get_input_module (GMathContext *context,
                                                        gchar *name)
cdef extern GMathModule* gmathcontext_get_output_module (GMathContext *context,
                                                         gchar *name)
cdef extern bool gmathcontext_load_input_module (GMathContext *context,
                                                 gchar *name)
cdef extern bool gmathcontext_load_output_module (GMathContext *context,
                                                  gchar *name)

cdef extern GMathFormula* gmathcontext_import (GMathContext *context,
                                               gchar *module,
                                               gchar *data)
cdef extern GMathFormula* gmathformula_new (GMathContext *context)
cdef extern void gmathformula_free (GMathFormula *formula)
cdef extern void gmathformula_set_root (GMathFormula *formula,
                                        GMathSymbol *symbol)
cdef extern size_t gmathformula_export (GMathFormula *formula, gchar *module,
                                        gchar **data)

cdef extern GMathSymbol* gmathsymbol_new (GMathContext *context, gchar *type)
cdef extern void gmathsymbol_free (GMathSymbol *symbol)
cdef extern void gmathsymbol_set_value (GMathSymbol *symbol, gchar *value)
cdef extern void gmathsymbol_set_child (GMathSymbol *symbol,
                                        GMathSymbol *child, int index)
cdef extern GMathSymbol* gmathsymbol_get_child (GMathSymbol *symbol,
                                                int index)

cdef class Symbol:
    cdef GMathSymbol    *csymbol
    cdef object         context
    cdef object         children

    def __new__ (self, context, type = "", symbol = None):
        cdef GMathSymbol *child
        self.context = context
        if symbol:
            self.csymbol = <GMathSymbol *> symbol
        elif type:
            self.csymbol = \
                gmathsymbol_new (<GMathContext *> self.context.c_context, type)

        self.children = []
        for i in range (0, self.csymbol.template.children_count):
            child = gmathsymbol_get_child (self.csymbol, i)
            if not child:
                self.children.append (None)
                continue
            self.children.append (Symbol (context, symbol = <object> child))

    def set_child (self, child, index):
        if index >= self.csymbol.template.children_count:
            return
        self.children[index] = child
        gmathsymbol_set_child (self.csymbol, <GMathSymbol *> child.c_symbol,
                               index)

    def free (self):
        gmathsymbol_free (self.csymbol)
        self.csymbol = NULL

    def __dealloc__ (self):
        self.free ()

    property value:
        def __get__ (self):
            return str (<object> self.csymbol.value)

        def __set__ (self, value):
            gmathsymbol_set_value (self.csymbol, value)

    property c_symbol:
        def __get__ (self):
            return <object> self.csymbol

cdef class Formula:
    cdef GMathFormula   *cformula
    cdef object         context
    cdef object         root

    def __new__ (self, context, formula = None):
        self.context = context
        self.context.register_formula (self)
        if formula:
            self.cformula = <GMathFormula *> formula
        else:
            self.cformula = \
                gmathformula_new (<GMathContext *> self.context.c_context)
        if self.cformula.root != NULL:
            self.root = Symbol (<object> self.cformula.root)
        else:
            self.root = None

    def free (self):
        if self.root:
            self.root.free ()
        self.set_root (None)    
        gmathformula_free (self.cformula)

    def __dealloc__ (self):
        self.free ()

    def set_root (self, root):
        if root:
            gmathformula_set_root (self.cformula, <GMathSymbol *> root.c_symbol)
        else:
            gmathformula_set_root (self.cformula, <GMathSymbol *> NULL)
        self.root = root

    def export (self):
        cdef gchar  *cdata
        cdef size_t size
        if not self.context.output_module:
            print "Error: please load or select an output module."
            return None
        size = gmathformula_export (self.cformula, self.context.output_module,
                                    &cdata)
        if not size:
            return None
        data = PyString_FromStringAndSize (cdata, size)
        free (cdata)
        return data

    property c_formula:
        def __get__ (self):
            return <object> self.cformula

cdef class Context:
    cdef GMathContext   *ccontext
    cdef object         _input_module
    cdef object         _output_module
    cdef object         formulas

    def __new__ (self):
        self.ccontext = gmathcontext_new ()
        self.input_module = None
        self.output_module = None
        self.formulas = []

    def __dealloc__ (self):
        for formula in self.formulas:
            formula.free ()
        gmathcontext_free (self.ccontext)

    def load_input_module (self, name):
        gmathcontext_load_input_module (self.ccontext, name)

    def load_output_module (self, name):
        gmathcontext_load_output_module (self.ccontext, name)

    def import_from_data (self, data):
        if not self.input_module:
            print "Error: please load or select an input module."
            return None
        cdef GMathFormula *formula
        formula = gmathcontext_import (self.ccontext, self.input_module, data)
        if formula == NULL:
            return None
        return Formula (self, <object> formula)

    def register_formula (self, formula):
        self.formulas.append (formula)

    def Formula (self):
        return Formula (self)

    def Symbol (self, type = "", symbol = None):
        return Symbol (self, type, symbol)

    property input_module:
        def __get__ (self):
            return self._input_module

        def __set__ (self, name):
            if name and not gmathcontext_get_input_module (self.ccontext,
                                                           name):
                self.load_input_module (name)
                if not gmathcontext_get_input_module (self.ccontext, name):
                    print "Error: %s input module not found." % name
                    return
            self._input_module = name

    property output_module:
        def __get__ (self):
            return self._output_module

        def __set__ (self, name):
            if name and not gmathcontext_get_output_module (self.ccontext,
                                                           name):
                self.load_output_module (name)
                if not gmathcontext_get_output_module (self.ccontext, name):
                    print "Error: %s output module not found." % name
                    return
            self._output_module = name

    property c_context:
        def __get__ (self):
            return <object> self.ccontext