/*
	dot_expr.c

	"emit" expressions to dot (graphvis).

	Copyright (C) 2011 Bill Currie <bill@taniwha.org>

	Author: Bill Currie <bill@taniwha.org>
	Date: 2011/01/20

	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:

		Free Software Foundation, Inc.
		59 Temple Place - Suite 330
		Boston, MA  02111-1307, USA

*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif

#ifdef HAVE_STRING_H
# include <string.h>
#endif
#ifdef HAVE_STRINGS_H
# include <strings.h>
#endif
#include <stdlib.h>

#include <QF/dstring.h>
#include <QF/mathlib.h>
#include <QF/quakeio.h>
#include <QF/va.h>

#include "qfalloca.h"

#include "expr.h"
#include "symtab.h"
#include "type.h"
#include "qc-parse.h"
#include "strpool.h"

static const char *expr_names[] =
{
	"error",
	"state",
	"bool",
	"label",
	"labelref",
	"block",
	"expr",
	"uexpr",
	"symbol",
	"temp",
	"vector",
	"nil",
	"value",
};

const char *
get_op_string (int op)
{
	switch (op) {
		case PAS:	return ".=";
		case OR:	return "||";
		case AND:	return "&&";
		case EQ:	return "==";
		case NE:	return "!=";
		case LE:	return "<=";
		case GE:	return ">=";
		case LT:	return "<";
		case GT:	return ">";
		case '=':	return "=";
		case '+':	return "+";
		case '-':	return "-";
		case '*':	return "*";
		case '/':	return "/";
		case '%':	return "%";
		case '&':	return "&";
		case '|':	return "|";
		case '^':	return "^";
		case '~':	return "~";
		case '!':	return "!";
		case SHL:	return "<<";
		case SHR:	return ">>";
		case '.':	return ".";
		case 'i':	return "<if>";
		case 'n':	return "<ifnot>";
		case IFBE:	return "<ifbe>";
		case IFB:	return "<ifb>";
		case IFAE:	return "<ifae>";
		case IFA:	return "<ifa>";
		case 'g':	return "<goto>";
		case 'r':	return "<return>";
		case 's':	return "<state>";
		case 'c':	return "<call>";
		case 'A':	return "<alias>";
		case 'C':	return "<cast>";
		case 'M':	return "<move>";
		case 'm':	return "<move>";
		default:
			return "unknown";
	}
}

typedef void (*print_f) (dstring_t *dstr, expr_t *, int, int, expr_t *);
static void _print_expr (dstring_t *dstr, expr_t *e, int level, int id,
						 expr_t *next);

static void
print_error (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	dasprintf (dstr, "%*se_%p [label=\"(error)\\n%d\"];\n", indent, "", e,
			   e->line);
}

static void
print_state (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	_print_expr (dstr, e->e.state.frame, level, id, next);
	_print_expr (dstr, e->e.state.think, level, id, next);
	if (e->e.state.step)
		_print_expr (dstr, e->e.state.step, level, id, next);
	dasprintf (dstr, "%*se_%p:f -> \"e_%p\";\n", indent, "", e,
			   e->e.state.frame);
	dasprintf (dstr, "%*se_%p:t -> \"e_%p\";\n", indent, "", e,
			   e->e.state.think);
	if (e->e.state.step)
		dasprintf (dstr, "%*se_%p:s -> e_%p;\n", indent, "", e,
				   e->e.state.step);
	dasprintf (dstr,
			   "%*se_%p [label=\"<f>state|<t>think|<s>step\",shape=record];\n",
			   indent, "", e);
}

static void
print_bool (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;
	int         i, count;
	int         tl_count = 0, fl_count = 0;
	ex_bool_t  *bool = &e->e.bool;

	dasprintf (dstr, "%*se_%p [shape=none,label=<\n", indent, "", e);
	dasprintf (dstr, "%*s<table border=\"0\" cellborder=\"1\" "
			   "cellspacing=\"0\">\n",
			   indent + 2, "");
	dasprintf (dstr, "%*s<tr><td colspan=\"2\">&lt;bool&gt;(%d)</td></tr>\n",
			   indent + 4, "", e->line);
	dasprintf (dstr, "%*s<tr><td>true</td><td>false</td></tr>\n",
			   indent + 4, "");
	if (bool->true_list)
		tl_count = bool->true_list->size;
	if (bool->false_list)
		fl_count = bool->false_list->size;
	count = min (tl_count, fl_count);
	for (i = 0; i < count; i++)
		dasprintf (dstr, "%*s<tr><td port=\"t%d\">t</td>"
				   "<td port=\"f%d\">f</td></tr>\n", indent, "", i, i);
	for ( ; i < tl_count; i++)
		dasprintf (dstr, "%*s<tr><td port=\"t%d\">t</td>%s</tr>\n",
				   indent, "", i,
				   i == count ? va ("<td rowspan=\"%d\"></td>",
									bool->true_list->size - count)
							  : "");
	for ( ; i < fl_count; i++)
		dasprintf (dstr, "%*s<tr>%s<td port=\"f%d\">f</td></tr>\n",
				   indent, "",
				   i == count ? va ("<td rowspan=\"%d\"></td>",
									bool->false_list->size - count)
							  : "",
				   i);
	dasprintf (dstr, "%*s</table>\n", indent + 2, "");
	dasprintf (dstr, "%*s>];\n", indent, "");
	if (e->next)
		next = e->next;
	_print_expr (dstr, e->e.bool.e, level, id, next);
	for (i = 0; i < tl_count; i++)
		dasprintf (dstr, "%*se_%p:t%d -> e_%p;\n", indent, "", e, i,
				   bool->true_list->e[i]);
	for (i = 0; i < fl_count; i++)
		dasprintf (dstr, "%*se_%p:f%d -> e_%p;\n", indent, "", e, i,
				   bool->false_list->e[i]);
	dasprintf (dstr, "%*se_%p -> e_%p;\n", indent, "", e, e->e.bool.e);
}

static void
print_label (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	if (e->next)
		next = e->next;
	if (next)
		dasprintf (dstr, "%*se_%p -> e_%p [constraint=true,style=dashed];\n",
				   indent, "", e, next);
	dasprintf (dstr, "%*se_%p [label=\"%s\\n%d\"];\n", indent, "", e,
			   e->e.label.name, e->line);
}

static void
print_labelref (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	if (e->next)
		next = e->next;
	if (next)
		dasprintf (dstr, "%*se_%p -> e_%p [constraint=true,style=dashed];\n",
				   indent, "", e, e->next);
	dasprintf (dstr, "%*se_%p [label=\"&%s\\n%d\"];\n", indent, "", e,
			   e->e.label.name, e->line);
}

static void
print_block (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;
	int         i;
	expr_t     *se;

	dasprintf (dstr, "%*se_%p [shape=none,label=<\n", indent, "", e);
	dasprintf (dstr, "%*s<table border=\"0\" cellborder=\"1\" "
			   "cellspacing=\"0\">\n", indent + 2, "");
	dasprintf (dstr, "%*s<tr><td colspan=\"2\">&lt;block&gt;(%d)%s</td>"
			   "</tr>\n", indent + 4, "", e->line,
			   e->e.block.is_call ? "c" : "");
	if (e->e.block.result)
		dasprintf (dstr, "%*s<tr><td colspan=\"2\" port=\"result\">=</td>"
				   "</tr>\n", indent + 4, "");
	for (se = e->e.block.head, i = 0; se; se = se->next, i++)
		dasprintf (dstr, "%*s<tr><td>%d</td><td port=\"b%d\">%s</td></tr>\n",
				   indent + 4, "", i, i, expr_names[se->type]);
	dasprintf (dstr, "%*s</table>\n", indent + 2, "");
	dasprintf (dstr, "%*s>];\n", indent, "");

	if (e->e.block.result) {
		_print_expr (dstr, e->e.block.result, level + 1, id, next);
		dasprintf (dstr, "%*se_%p:result -> e_%p;\n", indent, "", e,
				   e->e.block.result);
	}
	if (e->next)
		next = e->next;
	for (se = e->e.block.head, i = 0; se; se = se->next, i++) {
		_print_expr (dstr, se, level + 1, id, next);
		dasprintf (dstr, "%*se_%p:b%d -> e_%p;\n", indent, "", e,
				   i, se);
	}
}

static void
print_call (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;
	expr_t     *p;
	int         i, count;
	expr_t    **args;

	for (count = 0, p = e->e.expr.e2; p; p = p->next)
		count++;
	args = alloca (count * sizeof (expr_t *));
	for (i = 0, p = e->e.expr.e2; p; p = p->next, i++)
		args[count - 1 - i] = p;

	_print_expr (dstr, e->e.expr.e1, level, id, next);
	dasprintf (dstr, "%*se_%p [label=\"<c>call", indent, "", e);
	for (i = 0; i < count; i++)
		dasprintf (dstr, "|<p%d>p%d", i, i);
	dasprintf (dstr, "\",shape=record];\n");
	for (i = 0; i < count; i++) {
		_print_expr (dstr, args[i], level + 1, id, next);
		dasprintf (dstr, "%*se_%p:p%d -> e_%p;\n", indent + 2, "", e, i,
				   args[i]);
	}
	dasprintf (dstr, "%*se_%p:c -> e_%p;\n", indent, "", e, e->e.expr.e1);
}

static void
print_subexpr (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	if (e->e.expr.op == 'c') {
		print_call (dstr, e, level, id, next);
		return;
	} else if (e->e.expr.op == 'i' || e->e.expr.op == 'n'
			   || e->e.expr.op == IFB || e->e.expr.op ==IFBE
			   || e->e.expr.op == IFA || e->e.expr.op ==IFAE) {
		_print_expr (dstr, e->e.expr.e1, level, id, next);
		dasprintf (dstr, "%*se_%p -> \"e_%p\" [label=\"t\"];\n", indent, "", e,
				   e->e.expr.e1);
		dasprintf (dstr, "%*se_%p -> \"e_%p\" [label=\"g\"];\n", indent, "", e,
				   e->e.expr.e2);
		if (e->next)
			next = e->next;
		if (next)
			dasprintf (dstr, "%*se_%p -> e_%p [constraint=true,"
					   "style=dashed];\n", indent, "", e, next);
	} else {
		_print_expr (dstr, e->e.expr.e1, level, id, next);
		_print_expr (dstr, e->e.expr.e2, level, id, next);
		dasprintf (dstr, "%*se_%p -> \"e_%p\" [label=\"l\"];\n", indent, "", e,
				   e->e.expr.e1);
		dasprintf (dstr, "%*se_%p -> \"e_%p\" [label=\"r\"];\n", indent, "", e,
				   e->e.expr.e2);
	}
	dasprintf (dstr, "%*se_%p [label=\"%s\\n%d\"];\n", indent, "", e,
			   get_op_string (e->e.expr.op), e->line);
}

static void
print_uexpr (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;
	dstring_t  *typestr = dstring_newstr();

	if (e->e.expr.op != 'g' && e->e.expr.e1)
		_print_expr (dstr, e->e.expr.e1, level, id, next);
	if (e->e.expr.op == 'A') {
		dstring_copystr (typestr, "\\n");
		print_type_str (typestr, e->e.expr.type);
	}
	if (e->e.expr.op != 'r' || e->e.expr.e1)
		dasprintf (dstr, "%*se_%p -> \"e_%p\";\n", indent, "", e,
				   e->e.expr.e1);
	dasprintf (dstr, "%*se_%p [label=\"%s%s\\n%d\"];\n", indent, "", e,
			   get_op_string (e->e.expr.op), typestr->str, e->line);
	dstring_delete (typestr);
}

static void
print_symbol (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	dasprintf (dstr, "%*se_%p [label=\"%s\\n%d\"];\n", indent, "", e,
			   e->e.symbol->name, e->line);
}

static void
print_temp (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	dasprintf (dstr, "%*se_%p [label=\"tmp_%p\\n%d\"];\n", indent, "", e, e,
			   e->line);
}

static void
print_vector (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	dasprintf (dstr, "%*se_%p [label=\"vector FIXME\"];\n", indent, "", e);
}

static void
print_nil (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;

	dasprintf (dstr, "%*se_%p [label=\"nil\\n%d\"];\n", indent, "", e,
			   e->line);
}

static void
print_value (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	int         indent = level * 2 + 2;
	type_t     *type;
	const char *label = "?!?";

	switch (e->e.value->type) {
		case ev_string:
			label = va ("\\\"%s\\\"", quote_string (e->e.value->v.string_val));
			break;
		case ev_float:
			label = va ("f %g", e->e.value->v.float_val);
			break;
		case ev_vector:
			label = va ("'%g %g %g'",
						e->e.value->v.vector_val[0],
						e->e.value->v.vector_val[1],
						e->e.value->v.vector_val[2]);
			break;
		case ev_quat:
			label = va ("'%g %g %g %g'",
						e->e.value->v.quaternion_val[0],
						e->e.value->v.quaternion_val[1],
						e->e.value->v.quaternion_val[2],
						e->e.value->v.quaternion_val[3]);
			break;
		case ev_pointer:
			type = e->e.value->v.pointer.type;
			if (e->e.value->v.pointer.def)
				label = va ("(%s)[%d]<%s>",
							type ? pr_type_name[type->type] : "???",
							e->e.value->v.pointer.val,
							e->e.value->v.pointer.def->name);
			else
				label = va ("(%s)[%d]",
							type ? pr_type_name[type->type] : "???",
							e->e.value->v.pointer.val);
			break;
		case ev_field:
			label = va ("field %d", e->e.value->v.pointer.val);
			break;
		case ev_entity:
			label = va ("ent %d", e->e.value->v.integer_val);
			break;
		case ev_func:
			label = va ("func %d", e->e.value->v.integer_val);
			break;
		case ev_integer:
			label = va ("i %d", e->e.value->v.integer_val);
			break;
		case ev_uinteger:
			label = va ("u %u", e->e.value->v.uinteger_val);
			break;
		case ev_short:
			label = va ("s %d", e->e.value->v.short_val);
			break;
		case ev_void:
			label = "<void>";
			break;
		case ev_invalid:
			label = "<invalid>";
			break;
		case ev_type_count:
			label = "<type_count>";
			break;
	}
	dasprintf (dstr, "%*se_%p [label=\"%s\\n%d\"];\n", indent, "", e, label,
			   e->line);
}

static void
_print_expr (dstring_t *dstr, expr_t *e, int level, int id, expr_t *next)
{
	static print_f print_funcs[] = {
		print_error,
		print_state,
		print_bool,
		print_label,
		print_labelref,
		print_block,
		print_subexpr,
		print_uexpr,
		print_symbol,
		print_temp,
		print_vector,
		print_nil,
		print_value,
	};
	int         indent = level * 2 + 2;

	if (!e) {
		dasprintf (dstr, "%*s\"e_%p\" [label=\"(null)\"];\n", indent, "", e);
		return;
	}
	if (e->printid == id)		// already printed this expression
		return;
	e->printid = id;

	if ((int) e->type < 0 || e->type > ex_value) {
		dasprintf (dstr, "%*se_%p [label=\"(bad expr type)\\n%d\"];\n",
				   indent, "", e, e->line);
		return;
	}
	print_funcs [e->type] (dstr, e, level, id, next);

}

void
dump_dot_expr (void *_e, const char *filename)
{
	static int  id = 0;
	dstring_t  *dstr = dstring_newstr ();
	expr_t     *e = (expr_t *) _e;

	dasprintf (dstr, "digraph expr_%p {\n", e);
	dasprintf (dstr, "  layout=dot; rankdir=TB; compound=true;\n");
	_print_expr (dstr, e, 0, ++id, 0);
	dasprintf (dstr, "}\n");

	if (filename) {
		QFile      *file;

		file = Qopen (filename, "wt");
		Qwrite (file, dstr->str, dstr->size - 1);
		Qclose (file);
	} else {
		fputs (dstr->str, stdout);
	}
	dstring_delete (dstr);
}

void
print_expr (expr_t *e)
{
	dump_dot_expr (e, 0);
}