#include <errno.h>

#include "func.h"
#include "node.h"
#include "sym.h"
#include "type.h"

int func_validate_expr(const struct func *func, struct node *n, int strict)
{
	struct tfield *f;
	struct node *arg;
	int nargs = 0;

	for (f = func->type->func.args, arg = n->expr.args;
	     f && arg; f++, arg = arg->next, nargs++) {
		if ((!strict && (arg->sym->type->ttype == T_VOID))
		    || (f->type->ttype == T_VOID)
		    || type_compatible(arg->sym->type, f->type) )
			continue;

		node_error(n, stderr, "type mismatch for argument %d, expected %T, got %T",
			   nargs, f->type, arg->sym->type);
	}

	return 0;
}

int func_static_validate(const struct func *func, struct node *n)
{
	if ((n->ntype == N_NUM) || (n->ntype == N_STRING)) {
	}

	switch (n->ntype) {
	case N_EXPR:
		if (func->type->ttype != T_FUNC) {
			node_error(n, stderr, "'%s' is not callable",
				   n->expr.func);
			return -EINVAL;
		}
		return func_validate_expr(func, n, 0);

	case N_IDENT:
		if (func->type->ttype == T_FUNC) {
			node_error(n, stderr, "'%s' is a function",
				   n->ident.name);
			return -EINVAL;
		}
		/* fall-through */
	case N_NUM:
	case N_STRING:
		/* ident, num, str. nothing to validate. just copy
		 * type info to the symbol if statically known */
		n->sym->type = func->type;
		break;
	}

	return 0;
}