#include <string.h>

#include "vkenum.h"
#include "vkgen.h"

typedef enum VkBool32 {
	VK_FALSE,
	VK_TRUE,
	VK_MAX_ENUM = VK_TRUE
} VkBool32;

@implementation Enum
-(void)process
{
	string      end = "_MAX_ENUM";
	int         len;
	string      prefix = nil;

	if (str_mid([self name], -8) == "FlagBits") {
		end = "_FLAG_BITS_MAX_ENUM";
	} else if (str_mid([self name], -11) == "FlagBitsEXT") {
		end = "_FLAG_BITS_MAX_ENUM_EXT";
	} else if (str_mid([self name], -3) == "KHR") {
		end = "_MAX_ENUM_KHR";
	}
	len = -strlen (end);
	for (int i = 0; i < type.strct.num_fields; i++) {
		qfot_var_t *var = &type.strct.fields[i];
		if (str_mid (var.name, len) == end) {
			// len is negative so +1 consumes 1 more char (_)
			prefix = str_hold (str_mid (var.name, 0, len + 1));
		}
	}
	if (prefix) {
		prefix_length = strlen (prefix);
	}
}

-initWithType: (qfot_type_t *) type
{
	if (!(self = [super initWithType: type])) {
		return nil;
	}
	[self process];
	return self;
}

-(string) name
{
	return str_mid(type.strct.tag, 4);
}

-(void) addToQueue
{
	string name = [self name];
	if (!Hash_Find (processed_types, name)) {
		//printf ("    +%s\n", name);
		Hash_Add (processed_types, (void *) name);
		[queue addObject: self];
	}
}

static int
skip_value(string name)
{
	return (str_str (name, "_MAX_ENUM") >= 0
			|| str_str (name, "_BEGIN_RANGE") >= 0
			|| str_str (name, "_END_RANGE") >= 0
			|| str_str (name, "_RANGE_SIZE") >= 0);
}

-(int) isEmpty
{
	int         num_values = 0;

	for (int i = 0, index = 0; i < type.strct.num_fields; i++) {
		qfot_var_t *var = &type.strct.fields[i];
		if (skip_value (var.name)) {
			continue;
		}
		num_values++;
	}
	return !num_values;
}

-(void) writeForward
{
	fprintf (output_file, "static exprenum_t %s_enum;\n", [self name]);
}

-(void) writeTable
{
	int         strip_bit = 0;
	int         strip_khr = 0;
	if (str_mid([self name], -8) == "FlagBits"
		|| str_mid([self name], -11) == "FlagBitsEXT") {
		strip_bit = 1;
	}
	if (str_mid([self name], -3) == "KHR") {
		strip_khr = 1;
	}

	fprintf (output_file, "exprtype_t %s_type = {\n", [self name]);
	fprintf (output_file, "\t.name = \"%s\",\n", [self name]);
	fprintf (output_file, "\t.size = sizeof (int),\n");
	if (strip_bit) {
		fprintf (output_file, "\t.binops = flag_binops,\n");
		fprintf (output_file, "\t.unops = flag_unops,\n");
		fprintf (output_file, "\t.get_string = cexpr_flags_get_string,\n");
	} else {
		fprintf (output_file, "\t.binops = enum_binops,\n");
		fprintf (output_file, "\t.unops = 0,\n");
		fprintf (output_file, "\t.get_string = cexpr_enum_get_string,\n");
	}
	fprintf (output_file, "\t.data = &%s_enum,\n", [self name]);
	fprintf (output_file, "};\n");

	if (![self isEmpty]) {
		fprintf (output_file, "static %s %s_values[] = {\n", [self name], [self name]);
		for (int i = 0, index = 0; i < type.strct.num_fields; i++) {
			qfot_var_t *var = &type.strct.fields[i];
			if (skip_value (var.name)) {
				continue;
			}
			fprintf (output_file, "\t%s,    // %d 0x%x\n",
					 var.name, var.offset, var.offset);
			index++;
		}
		fprintf (output_file, "};\n");
	}
	fprintf (output_file, "static exprsym_t %s_symbols[] = {\n", [self name]);
	for (int i = 0, index = 0; i < type.strct.num_fields; i++) {
		qfot_var_t *var = &type.strct.fields[i];
		if (skip_value (var.name)) {
			continue;
		}
		fprintf (output_file, "\t{\"%s\", &%s_type, %s_values + %d},\n",
				 var.name, [self name], [self name], index);
		if (prefix_length) {
			string      shortname = str_mid (var.name, prefix_length);
			if (strip_bit) {
				int bit_pos = str_str (shortname, "_BIT");
				if (bit_pos >= 0) {
					shortname = str_mid (shortname, 0, bit_pos);
				}
			} else if (strip_khr) {
				int khr_pos = str_str (shortname, "_KHR");
				if (khr_pos >= 0) {
					shortname = str_mid (shortname, 0, khr_pos);
				}
			}
			fprintf (output_file, "\t{\"%s\", &%s_type, %s_values + %d},\n",
					 str_lower(shortname), [self name], [self name], index);
		}
		index++;
	}
	fprintf (output_file, "\t{ }\n");
	fprintf (output_file, "};\n");
	fprintf (output_file, "static exprtab_t %s_symtab = {\n", [self name]);
	fprintf (output_file, "\t%s_symbols,\n", [self name]);
	fprintf (output_file, "};\n");
	fprintf (output_file, "static exprenum_t %s_enum = {\n", [self name]);
	fprintf (output_file, "\t&%s_type,\n", [self name]);
	fprintf (output_file, "\t&%s_symtab,\n", [self name]);
	fprintf (output_file, "};\n");

	fprintf (output_file, "static plfield_t %s_field = { 0, 0, QFString,"
			 " parse_enum, &%s_enum};\n",
			 [self name], [self name]);
	fprintf (output_file, "int parse_%s (const plfield_t *field,"
			 " const plitem_t *item, void *data, plitem_t *messages,"
			 " void *context)\n",
			 [self name]);
	fprintf (output_file, "{\n");
	fprintf (output_file,
			 "\treturn parse_enum (&%s_field, item, data, messages,"
			 " context);\n",
			 [self name]);
	fprintf (output_file, "}\n");

	fprintf (header_file, "int parse_%s (const plfield_t *field,"
			 " const plitem_t *item, void *data, plitem_t *messages,"
			 " void *context);\n",
			 [self name]);
	fprintf (header_file, "extern exprtype_t %s_type;\n", [self name]);
}

-(void) writeSymtabInit
{
	fprintf (output_file, "\tcexpr_init_symtab (&%s_symtab, context);\n",
			 [self name]);
}

-(void) writeSymtabEntry
{
	fprintf (output_file, "\tHash_Add (enum_symtab, &%s_enum);\n",
			 [self name]);
}

-(string) cexprType
{
	return [self name] + "_type";
}

-(string) parseType
{
	return "QFString";
}

-(string) parseFunc
{
	return "parse_enum";
}

-(string) parseData
{
	return "&" + [self name] + "_enum";
}
@end