// GF Python bindings
// Jordi Saludes, upc.edu 2010
//

#include <Python.h>
#include <sys/stat.h>
#include "pygf.h"

/* utilities */

int
checkType(void* obj, PyTypeObject* tp)
{
  int isRight = PyObject_TypeCheck((PyObject*)obj, tp);
  if (!isRight)
    PyErr_Format(PyExc_TypeError, "Expecting a %s.", tp->tp_doc);
  return isRight;
}


/* new types and declarations */

NEWGF(CId,GF_CId,CIdType,"gf.cid","c identifier")
NEWGF(Lang,GF_Language,LangType,"gf.lang","language")
NEWGF(gfType,GF_Type,gfTypeType,"gf.type","gf type")
NEWGF(PGF,GF_PGF,PGFType,"gf.pgf","PGF module")
NEWGF(Expr,GF_Expr,ExprType,"gf.expr","gf expression")	
NEWGF(Tree,GF_Tree,TreeType,"gf.tree","gf tree")


/* CId methods, constructor and destructor */

DEALLOCFN(CId_dealloc, CId, gf_freeCId, "freeCId")

/* static PyObject*
CId_repr(CId *self)
{
  char* str_cid = gf_showCId(self->obj);
  PyObject* repr = PyString_FromString(str_cid);
  free(str_cid);
  return repr;
  } */



/* PGF methods, constructor and destructor */

DEALLOCFN(PGF_dealloc, PGF, gf_freePGF, "freePGF")

static PyObject* 
pgf_repr(PGF *self) {
  Lang lang;
  gf_abstractName(self, &lang);
  const char* abs = gf_showLanguage(&lang);
  gf_freeLanguage(&lang);					     
  return PyString_FromFormat("<gf.pgf with abstract %s at 0x%x>", abs, self->obj);
}

static gfType*
startCategory(PGF *self, PyObject *noarg)
{
  gfType *cat;
  if (!checkType(self, &PGFType)) return NULL;
  cat = (gfType*)gfTypeType.tp_new(&gfTypeType,NULL,NULL);
  gf_startCat((PGF*)self, cat);
  return cat;
}

inline static PyObject*
categories(PGF* self)
{
  return gf_categories(self);
}

inline static PyObject*
languages(PGF* self)
{
  return gf_languages(self);
}

static PyObject*
languageCode(PGF *self, PyObject *args)
{
  Lang *lang;
  if (!PyArg_ParseTuple(args, "O", &lang))
    return NULL;
  if (!checkType(lang, &LangType)) return NULL;
  char* scode = gf_languageCode(self, lang);
  if (scode) {
    PyObject* result = PyString_FromString(scode);
    free(scode);
    return result;
  } else {
    Py_INCREF(Py_None);
    return Py_None;
  }
}

static PyObject*
linearize(PGF *self, PyObject *args)
{
  Lang *lang;
  Tree *tree;
  if (!checkType(self,&PGFType)) return NULL;
  if (!PyArg_ParseTuple(args, "OO", &lang, &tree))
    return NULL;
  if (!checkType(lang,&LangType)) return NULL;
  if (!checkType(tree,&TreeType)) return NULL;
  char* c_lin = gf_linearize(self, lang, tree);
  return PyString_FromString(c_lin);
}

static Lang*
abstractName(PGF *self)
{
  Lang* abs_name = (Lang*)LangType.tp_new(&LangType,NULL,NULL);
  if (!checkType(self,&PGFType)) return NULL;
  gf_abstractName(self, abs_name);
  return abs_name;
}

static PyObject*
printName(PGF *self, PyObject *args)
{
	Lang* lang;
	CId* id;
	if (!PyArg_ParseTuple(args, "OO", &lang, &id))
		return NULL;
	if (!checkType(lang,&LangType)) return NULL;
	if (!checkType(id,&CIdType)) return NULL;
	char *pname = gf_showPrintName(self, lang, id);
	PyObject* result = PyString_FromString(pname);
	free(pname);
	return result;
}


static PyObject*
parse(PGF *self, PyObject *args, PyObject *kws)
{
	PyObject *lang, *cat = NULL;
	//GF_PGF pgf;
	// GF_Language lang;
	// GF_Type cat;
	char *lexed;
	static char *kwlist[] = {"lexed", "lang", "cat", NULL};
	if (!PyArg_ParseTupleAndKeywords(args, kws, "sO|O", kwlist,
				       &lexed, &lang, &cat))
    	return NULL;
	if (!checkType(self, &PGFType)) return NULL;
	if (!checkType(lang, &LangType)) return NULL;
	if (cat) {
	  if (!checkType(cat, &gfTypeType)) return NULL;
	} else { 
	  cat = (PyObject*)startCategory(self,NULL);		
	} 
	return gf_parse(self, lang, cat, lexed);
}

static PGF*
readPGF(PyObject *self, PyObject *args)
{
  char *path;
  struct stat info;
  PGF *pgf;
  if (!PyArg_ParseTuple(args, "s", &path))
    return NULL;
  if (stat(path, &info) == 0) {
    pgf = (PGF*)PGFType.tp_new(&PGFType,NULL,NULL);
    if (!pgf) return NULL;
    gf_readPGF(pgf, path);
    return pgf;
  } else {
    PyErr_Format(PyExc_IOError, "No such file: %s", path);
    return NULL;
  }
}

//Todo: repr

static PyMethodDef pgf_methods[] = {
  {"parse", (PyCFunction)parse, METH_VARARGS|METH_KEYWORDS,"Parse a string."},
  {"lin", (PyCFunction)linearize, METH_VARARGS,"Linearize tree."},
  {"lang_code", (PyCFunction)languageCode, METH_VARARGS,"Get the language code."},
  {"print_name", (PyCFunction)printName, METH_VARARGS,"Get the print name for a id."},
  {"startcat", (PyCFunction)startCategory, METH_NOARGS,"Get the start category."},
  {"categories", (PyCFunction)categories, METH_NOARGS,"Get all categories."},
  {"abstract", (PyCFunction)abstractName, METH_NOARGS,"Get the module abstract name."},
  {"languages", (PyCFunction)languages, METH_NOARGS,"Get the module languages."},
  {NULL, NULL, 0, NULL}  /* Sentinel */
};

REPRCB(CId_repr, CId, gf_showCId)


/* Language methods, constructor and destructor */

REPRCB(lang_repr, Lang, gf_showLanguage)
DEALLOCFN(Lang_dealloc, Lang, gf_freeLanguage, "freeLanguage")

static Lang*
readLang(PyObject *self, PyObject *args)
{
  char *langName;
  Lang *l;
  if (!PyArg_ParseTuple(args,"s",&langName))
    return NULL;
  l = (Lang*)LangType.tp_new(&LangType,NULL,NULL);
  if(!l) return NULL;
  gf_readLanguage(l,langName);
  return l;
}



/* gf types: methods, constructor and destructor */

DEALLOCFN(gfType_dealloc, gfType, gf_freeType, "freeType")
REPRCB(gfType_repr, gfType, gf_showType)


/* expression type: methods, destructor */

DEALLOCFN(expr_dealloc, Expr, gf_freeExpr, "freeExpr")
REPRCB(expr_repr, Expr, gf_showExpr)


/* tree typr: methods, constructor and destructor */
//  Are Expr and Tree equivalent ? 

REPRCB(tree_repr, Tree, gf_showExpr)
DEALLOCFN(Tree_dealloc, Tree, gf_freeTree, "freeTree")


/* gf module methods */

static PyMethodDef gf_methods[] = {
  {"read_pgf", (PyCFunction)readPGF, METH_VARARGS,"Read pgf file."},
  {"read_language", (PyCFunction)readLang, METH_VARARGS,"Get the language."},
  {"startcat", (PyCFunction)startCategory, METH_VARARGS,"Get the start category of a pgf module."},
  {NULL, NULL, 0, NULL}  /* Sentinel */
};


#ifndef PyMODINIT_FUNC/* declarations for DLL import/export */
#define PyMODINIT_FUNC void
#endif

PyMODINIT_FUNC
initgf(void) 
{
  PyObject* m;
#define READYTYPE(t,trepr,tdealloc) t.tp_new = PyType_GenericNew; \
    t.tp_repr = (reprfunc)trepr; \
	t.tp_dealloc = (destructor)tdealloc; \
	if (PyType_Ready(&t) < 0) return;
	
        READYTYPE(CIdType, CId_repr, CId_dealloc)
	PGFType.tp_methods = pgf_methods;
	READYTYPE(PGFType, pgf_repr, PGF_dealloc)
	READYTYPE(LangType, lang_repr, Lang_dealloc)
	READYTYPE(gfTypeType, gfType_repr, gfType_dealloc)
	READYTYPE(ExprType, expr_repr, expr_dealloc)
	READYTYPE(TreeType, tree_repr, Tree_dealloc)	

  m = Py_InitModule3("gf", gf_methods,
		     "Grammatical Framework.");
  static char *argv[] = {"gf.so", 0}, **argv_ = argv;
  static int argc = 1;
  gf_init (&argc, &argv_);
  hs_add_root (__stginit_PyGF);

#define ADDTYPE(t) Py_INCREF(&t);\
PyModule_AddObject(m, "gf", (PyObject *)&t);

	ADDTYPE(PGFType)
	ADDTYPE(LangType)
	ADDTYPE(gfTypeType)
	ADDTYPE(TreeType)
	ADDTYPE(ExprType)
}


/* List utilities to be imported by FFI */

inline PyObject* newList() { return  PyList_New(0); }
inline void append(PyObject* l, PyObject* ob) { PyList_Append(l, ob); }