/*

 *   Interface to the ncurses panel library

 *

 * Original version by Thomas Gellekum

 */

/* Release Number */

static char *PyCursesVersion = "2.1";

/* Includes */

#include "Python.h"

#include "py_curses.h"

#include <panel.h>

static PyObject *PyCursesError;

/* Utility Functions */

/*

 * Check the return code from a curses function and return None 

 * or raise an exception as appropriate.

 */

static PyObject *

PyCursesCheckERR(int code, char *fname)

{

    if (code != ERR) {

	Py_INCREF(Py_None);

	return Py_None;

    } else {

	if (fname == NULL) {

	    PyErr_SetString(PyCursesError, catchall_ERR);

	} else {

	    PyErr_Format(PyCursesError, "%s() returned ERR", fname);

	}

	return NULL;

    }

}

/*****************************************************************************

 The Panel Object

******************************************************************************/

/* Definition of the panel object and panel type */

typedef struct {

    PyObject_HEAD

    PANEL *pan;

    PyCursesWindowObject *wo;	/* for reference counts */

} PyCursesPanelObject;

PyTypeObject PyCursesPanel_Type;

#define PyCursesPanel_Check(v)	 (Py_TYPE(v) == &PyCursesPanel_Type)

/* Some helper functions. The problem is that there's always a window

   associated with a panel. To ensure that Python's GC doesn't pull

   this window from under our feet we need to keep track of references

   to the corresponding window object within Python. We can't use

   dupwin(oldwin) to keep a copy of the curses WINDOW because the

   contents of oldwin is copied only once; code like

   win = newwin(...)

   pan = win.panel()

   win.addstr(some_string)

   pan.window().addstr(other_string)

   will fail. */

/* We keep a linked list of PyCursesPanelObjects, lop. A list should

   suffice, I don't expect more than a handful or at most a few

   dozens of panel objects within a typical program. */

typedef struct _list_of_panels {

    PyCursesPanelObject *po;

    struct _list_of_panels *next;

} list_of_panels;

/* list anchor */

static list_of_panels *lop;

/* Insert a new panel object into lop */

static int

insert_lop(PyCursesPanelObject *po)

{

    list_of_panels *new;

    if ((new = (list_of_panels *)malloc(sizeof(list_of_panels))) == NULL) {

	PyErr_NoMemory();

	return -1;

    }

    new->po = po;

    new->next = lop;

    lop = new;

    return 0;

}

/* Remove the panel object from lop */

static void

remove_lop(PyCursesPanelObject *po)

{

    list_of_panels *temp, *n;

    temp = lop;

    if (temp->po == po) {

	lop = temp->next;

	free(temp);

	return;

    }

    while (temp->next == NULL || temp->next->po != po) {

	if (temp->next == NULL) {

	    PyErr_SetString(PyExc_RuntimeError,

			    "remove_lop: can't find Panel Object");

	    return;

	}

	temp = temp->next;

    }

    n = temp->next->next;

    free(temp->next);

    temp->next = n;

    return;

}

/* Return the panel object that corresponds to pan */

static PyCursesPanelObject *

find_po(PANEL *pan)

{

    list_of_panels *temp;

    for (temp = lop; temp->po->pan != pan; temp = temp->next)

	if (temp->next == NULL) return NULL;	/* not found!? */

    return temp->po;

}

/* Function Prototype Macros - They are ugly but very, very useful. ;-)

   X - function name

   TYPE - parameter Type

   ERGSTR - format string for construction of the return value

   PARSESTR - format string for argument parsing */

#define Panel_NoArgNoReturnFunction(X) \

static PyObject *PyCursesPanel_##X(PyCursesPanelObject *self) \

{ return PyCursesCheckERR(X(self->pan), # X); }

#define Panel_NoArgTrueFalseFunction(X) \

static PyObject *PyCursesPanel_##X(PyCursesPanelObject *self) \

{ \

  if (X (self->pan) == FALSE) { Py_INCREF(Py_False); return Py_False; } \

  else { Py_INCREF(Py_True); return Py_True; } }

#define Panel_TwoArgNoReturnFunction(X, TYPE, PARSESTR) \

static PyObject *PyCursesPanel_##X(PyCursesPanelObject *self, PyObject *args) \

{ \

  TYPE arg1, arg2; \

  if (!PyArg_ParseTuple(args, PARSESTR, &arg1, &arg2)) return NULL; \

  return PyCursesCheckERR(X(self->pan, arg1, arg2), # X); }

/* ------------- PANEL routines --------------- */

Panel_NoArgNoReturnFunction(bottom_panel)

Panel_NoArgNoReturnFunction(hide_panel)

Panel_NoArgNoReturnFunction(show_panel)

Panel_NoArgNoReturnFunction(top_panel)

Panel_NoArgTrueFalseFunction(panel_hidden)

Panel_TwoArgNoReturnFunction(move_panel, int, "ii;y,x")

/* Allocation and deallocation of Panel Objects */

static PyObject *

PyCursesPanel_New(PANEL *pan, PyCursesWindowObject *wo)

{

    PyCursesPanelObject *po;

    po = PyObject_NEW(PyCursesPanelObject, &PyCursesPanel_Type);

    if (po == NULL) return NULL;

    po->pan = pan;

    po->wo = wo;

    Py_INCREF(wo);

    if (insert_lop(po) < 0) {

	PyObject_DEL(po);

	return NULL;

    }

    return (PyObject *)po;

}

static void

PyCursesPanel_Dealloc(PyCursesPanelObject *po)

{

    (void)del_panel(po->pan);

    Py_DECREF(po->wo);

    remove_lop(po);

    PyObject_DEL(po);

}

/* panel_above(NULL) returns the bottom panel in the stack. To get

   this behaviour we use curses.panel.bottom_panel(). */

static PyObject *

PyCursesPanel_above(PyCursesPanelObject *self)

{

    PANEL *pan;

    PyCursesPanelObject *po;

    pan = panel_above(self->pan);

    if (pan == NULL) {		/* valid output, it means the calling panel

				   is on top of the stack */

	Py_INCREF(Py_None);

	return Py_None;

    }

    po = find_po(pan);

    if (po == NULL) {

	PyErr_SetString(PyExc_RuntimeError,

			"panel_above: can't find Panel Object");

	return NULL;

    }

    Py_INCREF(po);

    return (PyObject *)po;

}

/* panel_below(NULL) returns the top panel in the stack. To get

   this behaviour we use curses.panel.top_panel(). */

static PyObject *

PyCursesPanel_below(PyCursesPanelObject *self)

{

    PANEL *pan;

    PyCursesPanelObject *po;

    pan = panel_below(self->pan);

    if (pan == NULL) {		/* valid output, it means the calling panel

				   is on the bottom of the stack */

	Py_INCREF(Py_None);

	return Py_None;

    }

    po = find_po(pan);

    if (po == NULL) {

	PyErr_SetString(PyExc_RuntimeError,

			"panel_below: can't find Panel Object");

	return NULL;

    }

    Py_INCREF(po);

    return (PyObject *)po;

}

static PyObject *

PyCursesPanel_window(PyCursesPanelObject *self)

{

    Py_INCREF(self->wo);

    return (PyObject *)self->wo;

}

static PyObject *

PyCursesPanel_replace_panel(PyCursesPanelObject *self, PyObject *args)

{

    PyCursesPanelObject *po;

    PyCursesWindowObject *temp;

    int rtn;

    if (PyTuple_Size(args) != 1) {

	PyErr_SetString(PyExc_TypeError, "replace requires one argument");

	return NULL;

    }

    if (!PyArg_ParseTuple(args, "O!;window object",

			  &PyCursesWindow_Type, &temp))

	return NULL;

    po = find_po(self->pan);

    if (po == NULL) {

	PyErr_SetString(PyExc_RuntimeError,

			"replace_panel: can't find Panel Object");

	return NULL;

    }

    rtn = replace_panel(self->pan, temp->win);

    if (rtn == ERR) {

	PyErr_SetString(PyCursesError, "replace_panel() returned ERR");

	return NULL;

    }

    Py_DECREF(po->wo);

    po->wo = temp;

    Py_INCREF(po->wo);

    Py_INCREF(Py_None);

    return Py_None;

}

static PyObject *

PyCursesPanel_set_panel_userptr(PyCursesPanelObject *self, PyObject *obj)

{

    Py_INCREF(obj);

    return PyCursesCheckERR(set_panel_userptr(self->pan, (void*)obj),

                            "set_panel_userptr");

}

static PyObject *

PyCursesPanel_userptr(PyCursesPanelObject *self)

{

    PyObject *obj;

    PyCursesInitialised; 

    obj = (PyObject *) panel_userptr(self->pan);

    if (obj == NULL) {

	PyErr_SetString(PyCursesError, "no userptr set");

	return NULL;

    }

    Py_INCREF(obj);

    return obj;

}

/* Module interface */

static PyMethodDef PyCursesPanel_Methods[] = {

    {"above",           (PyCFunction)PyCursesPanel_above, METH_NOARGS},

    {"below",           (PyCFunction)PyCursesPanel_below, METH_NOARGS},

    {"bottom",          (PyCFunction)PyCursesPanel_bottom_panel, METH_NOARGS},

    {"hidden",          (PyCFunction)PyCursesPanel_panel_hidden, METH_NOARGS},

    {"hide",            (PyCFunction)PyCursesPanel_hide_panel, METH_NOARGS},

    {"move",            (PyCFunction)PyCursesPanel_move_panel, METH_VARARGS},

    {"replace",         (PyCFunction)PyCursesPanel_replace_panel, METH_VARARGS},

    {"set_userptr",     (PyCFunction)PyCursesPanel_set_panel_userptr, METH_O},

    {"show",            (PyCFunction)PyCursesPanel_show_panel, METH_NOARGS},

    {"top",             (PyCFunction)PyCursesPanel_top_panel, METH_NOARGS},

    {"userptr",         (PyCFunction)PyCursesPanel_userptr, METH_NOARGS},

    {"window",          (PyCFunction)PyCursesPanel_window, METH_NOARGS},

    {NULL,		NULL}   /* sentinel */

};

static PyObject *

PyCursesPanel_GetAttr(PyCursesPanelObject *self, char *name)

{

    return Py_FindMethod(PyCursesPanel_Methods, (PyObject *)self, name);

}

/* -------------------------------------------------------*/

PyTypeObject PyCursesPanel_Type = {

    PyVarObject_HEAD_INIT(NULL, 0)

    "_curses_panel.curses panel",	/*tp_name*/

    sizeof(PyCursesPanelObject),	/*tp_basicsize*/

    0,			/*tp_itemsize*/

    /* methods */

    (destructor)PyCursesPanel_Dealloc, /*tp_dealloc*/

    0,			/*tp_print*/

    (getattrfunc)PyCursesPanel_GetAttr, /*tp_getattr*/

    (setattrfunc)0, /*tp_setattr*/

    0,			/*tp_compare*/

    0,			/*tp_repr*/

    0,			/*tp_as_number*/

    0,			/*tp_as_sequence*/

    0,			/*tp_as_mapping*/

    0,			/*tp_hash*/

};

/* Wrapper for panel_above(NULL). This function returns the bottom

   panel of the stack, so it's renamed to bottom_panel().

   panel.above() *requires* a panel object in the first place which

   may be undesirable. */

static PyObject *

PyCurses_bottom_panel(PyObject *self)

{

    PANEL *pan;

    PyCursesPanelObject *po;

    PyCursesInitialised;

    pan = panel_above(NULL);

    if (pan == NULL) {		/* valid output, it means

				   there's no panel at all */  

	Py_INCREF(Py_None);

	return Py_None;

    }

    po = find_po(pan);

    if (po == NULL) {

	PyErr_SetString(PyExc_RuntimeError,

			"panel_above: can't find Panel Object");

	return NULL;

    }

    Py_INCREF(po);

    return (PyObject *)po;

}

static PyObject *

PyCurses_new_panel(PyObject *self, PyObject *args)

{

    PyCursesWindowObject *win;

    PANEL *pan;

    if (!PyArg_ParseTuple(args, "O!", &PyCursesWindow_Type, &win))

        return NULL;

    pan = new_panel(win->win);

    if (pan == NULL) {

	PyErr_SetString(PyCursesError, catchall_NULL);

	return NULL;

    }

    return (PyObject *)PyCursesPanel_New(pan, win);

}

/* Wrapper for panel_below(NULL). This function returns the top panel

   of the stack, so it's renamed to top_panel(). panel.below()

   *requires* a panel object in the first place which may be

   undesirable. */

static PyObject *

PyCurses_top_panel(PyObject *self)

{

    PANEL *pan;

    PyCursesPanelObject *po;

    PyCursesInitialised;

    pan = panel_below(NULL);

    if (pan == NULL) {		/* valid output, it means

				   there's no panel at all */

	Py_INCREF(Py_None);

	return Py_None;

    }

    po = find_po(pan);

    if (po == NULL) {

	PyErr_SetString(PyExc_RuntimeError,

			"panel_below: can't find Panel Object");

	return NULL;

    }

    Py_INCREF(po);

    return (PyObject *)po;

}

static PyObject *PyCurses_update_panels(PyObject *self)

{ 

    PyCursesInitialised;

    update_panels();

    Py_INCREF(Py_None);

    return Py_None;

}

/* List of functions defined in the module */

static PyMethodDef PyCurses_methods[] = {

    {"bottom_panel",        (PyCFunction)PyCurses_bottom_panel,  METH_NOARGS},

    {"new_panel",           (PyCFunction)PyCurses_new_panel,     METH_VARARGS},

    {"top_panel",           (PyCFunction)PyCurses_top_panel,     METH_NOARGS},

    {"update_panels",       (PyCFunction)PyCurses_update_panels, METH_NOARGS},

    {NULL,		NULL}		/* sentinel */

};

/* Initialization function for the module */

PyMODINIT_FUNC

init_curses_panel(void)

{

    PyObject *m, *d, *v;

    /* Initialize object type */

    Py_TYPE(&PyCursesPanel_Type) = &PyType_Type;

    import_curses();

    /* Create the module and add the functions */

    m = Py_InitModule("_curses_panel", PyCurses_methods);

    if (m == NULL)

    	return;

    d = PyModule_GetDict(m);

    /* For exception _curses_panel.error */

    PyCursesError = PyErr_NewException("_curses_panel.error", NULL, NULL);

    PyDict_SetItemString(d, "error", PyCursesError);

    /* Make the version available */

    v = PyString_FromString(PyCursesVersion);

    PyDict_SetItemString(d, "version", v);

    PyDict_SetItemString(d, "__version__", v);

    Py_DECREF(v);

}