/*
 *
 * Gestion de la pile des operandes
 *
 */

#include "pile.h"
#include "exceptions.h"
#include "numbers.h"
#include "main.h"
#include "parse.h"
#ifdef HAVE_CONFIG_H
#include "config.h"
#else
#define _(x) x
#endif

/* FIXME manque procedure vidage de pile en fin de prog */

pile_elem pile[PILE_MAX];
unsigned int pile_ptr = 0;

void push_pile(char *st)
{
	int valid1, valid2, valid3, valid4;
	int i_number;
	double d_number;
	polynome poly;
	char *buf;

	i_number = char_to_number(st, &valid1);
	d_number = char_to_double(st, &valid2);
	valid3 = is_mute(st);
	poly = (polynome) NomVarToVar(st, variables, (char *) valid4);

	if (valid1) {		/* il s agit d un entier */
		push_pile_poly(ply_constr(rat_constr(i_number, 1), 0));
	} else if (valid2) {	/* il s agit d un flottant */
		push_pile_poly(ply_constr(rat_constr_from_double(d_number), 0));
	} else if (valid3) {	/* il s agit de x */
		push_pile_poly(ply_constr(rat_constr(1, 1), 0));
	} else if (valid4) {	/* il s agit d une variable */
		push_pile_poly(ply_copy(poly));
	} else {		/* il s agit d un nom */
		push_pile_string(Estrdup(st));
	}
}


void push_pile_poly(polynome poly)
{
	if (pile_ptr != PILE_MAX) {
		pile[pile_ptr].type = T_POLY;
		pile[pile_ptr].poly = poly;
		pile_ptr++;
	} else {
		exception(1, _("push_pile_poly: Stack Overflow"));
	}

}

void push_pile_int(int val)
{
	if (pile_ptr != PILE_MAX) {
		pile[pile_ptr].type = T_INT;
		pile[pile_ptr].val = val;
		pile_ptr++;
	} else {
		exception(1, _("push_pile_int: Stack Overflow"));
	}

}

void push_pile_string(char *st)
{
	if (pile_ptr != PILE_MAX) {
		pile[pile_ptr].type = T_STRING;
		pile[pile_ptr].label = Estrdup(st);
		pile_ptr++;
	} else {
		exception(1, _("push_pile_string: Stack Overflow"));
	}

}

pile_elem pop_pile(unsigned int count)
{
	char buf[50];

	if ((int) (pile_ptr - count) >= 0) {
		pile_ptr -= count;
	} else {
		sprintf(buf, _("pop_pile: Can't pop %u elements"), count);
		exception(1, buf);
	}
	return pile[pile_ptr];
}

char *affichage_level_1(void)
{
	char *result;

	if (!pile_ptr) {
		switch (pile[pile_ptr - 1].type) {
		case T_POLY:
			result = ply_affichage(pile[pile_ptr - 1].poly);
			break;
		case T_STRING:
			result = pile[pile_ptr - 1].label;
			break;
		case T_INT:
			result = (char *) Emalloc(11 * sizeof(char));

			sprintf(result, "%10d", pile[pile_ptr - 1].val);
			break;
		}
	}
}

int is_mute(char *st)
{				/* FIXME: test lowercase / uppercase */
	char buf[2];

	sprintf(buf, "%c", mute);
	return strcmp(st, buf);
}


void act_pile(int func)
{
	pile_elem operande1, operande2;
	char buf[50];

	sprintf(buf, _("Calling act_pile(%i)\n"), func);
	pushcontext(buf);
	switch (func) {
	case OP_PLUS:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			push_pile_poly(ply_addition(operande1.poly, operande2.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
			if (operande2.poly)
				ply_destruct(operande2.poly);
		} else {
			exception(1, _("act_pile: OP_PLUS invalid arguments"));
		}
		break;
	case OP_MOINS:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			push_pile_poly(ply_soustraction(operande1.poly, operande2.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
			if (operande2.poly)
				ply_destruct(operande2.poly);
		} else {
			exception(1, _("act_pile: OP_MOINS invalid arguments"));
		}
		break;
	case OP_MUL:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			push_pile_poly(ply_multiplication(operande1.poly, operande2.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
			if (operande2.poly)
				ply_destruct(operande2.poly);
		} else {
			exception(1, _("act_pile: OP_MUL invalid arguments"));
		}
		break;
	case OP_DIV:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			push_pile_poly(ply_division(operande1.poly, operande2.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
			if (operande2.poly)
				ply_destruct(operande2.poly);
		} else {
			exception(1, _("act_pile: OP_DIV invalid arguments"));
		}
		break;
	case OP_MOD:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			push_pile_poly(ply_modulo(operande1.poly, operande2.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
			if (operande2.poly)
				ply_destruct(operande2.poly);
		} else {
			exception(1, _("act_pile: OP_MOD invalid arguments"));
		}
		break;
	case OP_EXP:
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
			if (operande2.poly) {
				if ((operande2.poly->coef.denom == 1)
				    && (operande2.poly->coef.num >= 0)) {
					push_pile_poly(ply_exposant
						       (operande1.poly, operande2.poly->coef.num));
					if (operande1.poly)
						ply_destruct(operande1.poly);
					ply_destruct(operande2.poly);
				} else {
					exception(1, _("act_pile: OP_EXP invalid arguments"));
				}
			} else {
				exception(1, _("act_pile: OP_EXP invalid arguments"));
			}
		} else {
			exception(1, _("act_pile: OP_EXP invalid arguments"));
		}
		break;
	case OP_ASSIGN:	/* FIXME: sens de l evaluation ? poly label sto ou label poly sto */
		operande1 = pop_pile(1);
		operande2 = pop_pile(1);
		if ((operande1.type == T_POLY) && (operande2.type == T_STRING)) {
			if (operande2.label) {
				InsererVarDansTab(&variables,
						  CreerElement(operande2.label,
							       (void *) operande1.poly));
				if (operande1.poly)
					ply_destruct(operande1.poly);
				free(operande2.label);
			} else {
				exception(1, _("act_pile: OP_ASSIGN empty string"));
			}
		} else {
			exception(1, _("act_pile: OP_ASSIGN invalid arguments"));
		}
		break;
	case OP_PLUS_UNARY:
		break;
	case OP_MOINS_UNARY:
		operande1 = pop_pile(1);
		if (operande1.type == T_POLY) {
			push_pile_poly(ply_soustraction
				       (ply_constr(rat_constr_zero(), 0), operande1.poly));
			if (operande1.poly)
				ply_destruct(operande1.poly);
		} else {
			exception(1, _("act_pile: OP_MOINS_UNARY invalid argument"));
		}
		break;
	case OP_FUNC_CALL:
		operande1 = pop_pile(1);
		if ((operande1.type == T_INT) && (operande1.val == 1)) {
			operande1 = pop_pile(1);
			operande2 = pop_pile(1);
			if ((operande1.type == T_POLY) && (operande2.type == T_POLY)) {
				if (operande2.poly) {
					if (operande2.poly->degre == 0) {
						push_pile_poly(ply_constr
							       (rat_constr_from_double
								(ply_valuation
								 (operande1.poly,
								  rat_to_double(operande2.poly->
										coef))), 1));
						if (operande1.poly)
							ply_destruct(operande1.poly);
						ply_destruct(operande2.poly);
					} else {
						exception(1,
							  _
							  ("act_pile: OP_FUNC_CALL invalid arguments"));
					}
				} else {
					exception(1, _("act_pile: OP_FUNC_CALL invalid arguments"));
				}
			} else {
				exception(1, _("act_pile: OP_FUNC_CALL invalid arguments"));
			}
		} else {
			exception(1, _("act_pile: OP_FUNC_CALL incorrect argument number"));
		}
		break;
	default:
		exception(1, _("act_pile: Unknown operator"));
	}
	popcontext();
}