/*
  Copyright 2007-2011 David Robillard <http://drobilla.net>

  Permission to use, copy, modify, and/or distribute this software for any
  purpose with or without fee is hereby granted, provided that the above
  copyright notice and this permission notice appear in all copies.

  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/

#define _XOPEN_SOURCE 500

#include <assert.h>
#include <locale.h>
#include <stdlib.h>
#include <string.h>

#include <glib.h>

#include "slv2_internal.h"

static void
slv2_value_set_numerics_from_string(SLV2Value val)
{
	char* locale;
	char* endptr;

	switch (val->type) {
	case SLV2_VALUE_URI:
	case SLV2_VALUE_BLANK:
	case SLV2_VALUE_QNAME_UNUSED:
	case SLV2_VALUE_STRING:
		break;
	case SLV2_VALUE_INT:
		// FIXME: locale kludge, need a locale independent strtol
		locale = slv2_strdup(setlocale(LC_NUMERIC, NULL));
		setlocale(LC_NUMERIC, "POSIX");
		val->val.int_val = strtol(val->str_val, &endptr, 10);
		setlocale(LC_NUMERIC, locale);
		free(locale);
		break;
	case SLV2_VALUE_FLOAT:
		// FIXME: locale kludge, need a locale independent strtod
		locale = slv2_strdup(setlocale(LC_NUMERIC, NULL));
		setlocale(LC_NUMERIC, "POSIX");
		val->val.float_val = strtod(val->str_val, &endptr);
		setlocale(LC_NUMERIC, locale);
		free(locale);
		break;
	case SLV2_VALUE_BOOL:
		val->val.bool_val = (!strcmp(val->str_val, "true"));
		break;
	}
}

/** Note that if @a type is numeric or boolean, the returned value is corrupt
 * until slv2_value_set_numerics_from_string is called.  It is not
 * automatically called from here to avoid overhead and imprecision when the
 * exact string value is known.
 */
SLV2Value
slv2_value_new(SLV2World world, SLV2ValueType type, const char* str)
{
	SLV2Value val = (SLV2Value)malloc(sizeof(struct _SLV2Value));
	val->type = type;

	switch (type) {
	case SLV2_VALUE_URI:
		val->val.uri_val = sord_new_uri(world->world, (const uint8_t*)str);
		assert(val->val.uri_val);
		val->str_val = (char*)sord_node_get_string(val->val.uri_val);
		break;
	case SLV2_VALUE_QNAME_UNUSED:
	case SLV2_VALUE_BLANK:
	case SLV2_VALUE_STRING:
	case SLV2_VALUE_INT:
	case SLV2_VALUE_FLOAT:
	case SLV2_VALUE_BOOL:
		val->str_val = slv2_strdup(str);
		break;
	}

	return val;
}

/** Create a new SLV2Value from @a node, or return NULL if impossible */
SLV2Value
slv2_value_new_from_node(SLV2World world, SordNode node)
{
	SLV2Value     result       = NULL;
	SordNode      datatype_uri = NULL;
	SLV2ValueType type         = SLV2_VALUE_STRING;

	switch (sord_node_get_type(node)) {
	case SORD_URI:
		type                = SLV2_VALUE_URI;
		result              = (SLV2Value)malloc(sizeof(struct _SLV2Value));
		result->type        = SLV2_VALUE_URI;
		result->val.uri_val = slv2_node_copy(node);
		result->str_val     = (char*)sord_node_get_string(result->val.uri_val);
		break;
	case SORD_LITERAL:
		datatype_uri = sord_node_get_datatype(node);
		if (datatype_uri) {
			if (sord_node_equals(datatype_uri, world->xsd_boolean_node))
				type = SLV2_VALUE_BOOL;
			else if (sord_node_equals(datatype_uri, world->xsd_decimal_node)
			         || sord_node_equals(datatype_uri, world->xsd_double_node))
				type = SLV2_VALUE_FLOAT;
			else if (sord_node_equals(datatype_uri, world->xsd_integer_node))
				type = SLV2_VALUE_INT;
			else
				SLV2_ERRORF("Unknown datatype %s\n", sord_node_get_string(datatype_uri));
		}
		result = slv2_value_new(world, type, (const char*)sord_node_get_string(node));
		switch (result->type) {
		case SLV2_VALUE_INT:
		case SLV2_VALUE_FLOAT:
		case SLV2_VALUE_BOOL:
			slv2_value_set_numerics_from_string(result);
		default:
			break;
		}
		break;
	case SORD_BLANK:
		type   = SLV2_VALUE_BLANK;
		result = slv2_value_new(world, type, (const char*)sord_node_get_string(node));
		break;
	default:
		assert(false);
	}

	return result;
}

SLV2_API
SLV2Value
slv2_value_new_uri(SLV2World world, const char* uri)
{
	return slv2_value_new(world, SLV2_VALUE_URI, uri);
}

SLV2_API
SLV2Value
slv2_value_new_string(SLV2World world, const char* str)
{
	return slv2_value_new(world, SLV2_VALUE_STRING, str);
}

SLV2_API
SLV2Value
slv2_value_new_int(SLV2World world, int val)
{
	char str[32];
	snprintf(str, sizeof(str), "%d", val);
	SLV2Value ret = slv2_value_new(world, SLV2_VALUE_INT, str);
	ret->val.int_val = val;
	return ret;
}

SLV2_API
SLV2Value
slv2_value_new_float(SLV2World world, float val)
{
	char str[32];
	snprintf(str, sizeof(str), "%f", val);
	SLV2Value ret = slv2_value_new(world, SLV2_VALUE_FLOAT, str);
	ret->val.float_val = val;
	return ret;
}

SLV2_API
SLV2Value
slv2_value_new_bool(SLV2World world, bool val)
{
	SLV2Value ret = slv2_value_new(world, SLV2_VALUE_BOOL, val ? "true" : "false");
	ret->val.bool_val = val;
	return ret;
}

SLV2_API
SLV2Value
slv2_value_duplicate(SLV2Value val)
{
	if (val == NULL)
		return val;

	SLV2Value result = (SLV2Value)malloc(sizeof(struct _SLV2Value));
	result->type = val->type;

	if (val->type == SLV2_VALUE_URI) {
		result->val.uri_val = slv2_node_copy(val->val.uri_val);
		result->str_val = (char*)sord_node_get_string(result->val.uri_val);
	} else {
		result->str_val = slv2_strdup(val->str_val);
		result->val = val->val;
	}

	return result;
}

SLV2_API
void
slv2_value_free(SLV2Value val)
{
	if (val) {
		if (val->type != SLV2_VALUE_URI) {
			free(val->str_val);
		}
		free(val);
	}
}

SLV2_API
bool
slv2_value_equals(SLV2Value value, SLV2Value other)
{
	if (value == NULL && other == NULL)
		return true;
	else if (value == NULL || other == NULL)
		return false;
	else if (value->type != other->type)
		return false;

	switch (value->type) {
	case SLV2_VALUE_URI:
		return sord_node_equals(value->val.uri_val, other->val.uri_val);
	case SLV2_VALUE_BLANK:
	case SLV2_VALUE_STRING:
	case SLV2_VALUE_QNAME_UNUSED:
		return !strcmp(value->str_val, other->str_val);
	case SLV2_VALUE_INT:
		return (value->val.int_val == other->val.int_val);
	case SLV2_VALUE_FLOAT:
		return (value->val.float_val == other->val.float_val);
	case SLV2_VALUE_BOOL:
		return (value->val.bool_val == other->val.bool_val);
	}

	return false; /* shouldn't get here */
}

SLV2_API
char*
slv2_value_get_turtle_token(SLV2Value value)
{
	size_t len    = 0;
	char*  result = NULL;
	char*  locale = NULL;

	switch (value->type) {
	case SLV2_VALUE_URI:
		len = strlen(value->str_val) + 3;
		result = calloc(len, 1);
		snprintf(result, len, "<%s>", value->str_val);
		break;
	case SLV2_VALUE_BLANK:
		len = strlen(value->str_val) + 3;
		result = calloc(len, 1);
		snprintf(result, len, "_:%s", value->str_val);
		break;
	case SLV2_VALUE_STRING:
	case SLV2_VALUE_QNAME_UNUSED:
	case SLV2_VALUE_BOOL:
		result = slv2_strdup(value->str_val);
		break;
	case SLV2_VALUE_INT:
		// INT64_MAX is 9223372036854775807 (19 digits) + 1 for sign
		// FIXME: locale kludge, need a locale independent snprintf
		locale = slv2_strdup(setlocale(LC_NUMERIC, NULL));
		len = 20;
		result = calloc(len, 1);
		setlocale(LC_NUMERIC, "POSIX");
		snprintf(result, len, "%d", value->val.int_val);
		setlocale(LC_NUMERIC, locale);
		break;
	case SLV2_VALUE_FLOAT:
		// FIXME: locale kludge, need a locale independent snprintf
		locale = slv2_strdup(setlocale(LC_NUMERIC, NULL));
		len = 20; // FIXME: proper maximum value?
		result = calloc(len, 1);
		setlocale(LC_NUMERIC, "POSIX");
		snprintf(result, len, "%f", value->val.float_val);
		setlocale(LC_NUMERIC, locale);
		break;
	}

	free(locale);

	return result;
}

SLV2_API
bool
slv2_value_is_uri(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_URI);
}

SLV2_API
const char*
slv2_value_as_uri(SLV2Value value)
{
	assert(slv2_value_is_uri(value));
	return value->str_val;
}

SLV2Node
slv2_value_as_node(SLV2Value value)
{
	assert(slv2_value_is_uri(value));
	return value->val.uri_val;
}

SLV2_API
bool
slv2_value_is_blank(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_BLANK);
}

SLV2_API
const char*
slv2_value_as_blank(SLV2Value value)
{
	assert(slv2_value_is_blank(value));
	return value->str_val;
}

SLV2_API
bool
slv2_value_is_literal(SLV2Value value)
{
	if (!value)
		return false;

	switch (value->type) {
	case SLV2_VALUE_STRING:
	case SLV2_VALUE_INT:
	case SLV2_VALUE_FLOAT:
		return true;
	default:
		return false;
	}
}

SLV2_API
bool
slv2_value_is_string(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_STRING);
}

SLV2_API
const char*
slv2_value_as_string(SLV2Value value)
{
	return value->str_val;
}

SLV2_API
bool
slv2_value_is_int(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_INT);
}

SLV2_API
int
slv2_value_as_int(SLV2Value value)
{
	assert(value);
	assert(slv2_value_is_int(value));
	return value->val.int_val;
}

SLV2_API
bool
slv2_value_is_float(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_FLOAT);
}

SLV2_API
float
slv2_value_as_float(SLV2Value value)
{
	assert(slv2_value_is_float(value) || slv2_value_is_int(value));
	if (slv2_value_is_float(value))
		return value->val.float_val;
	else // slv2_value_is_int(value)
		return (float)value->val.int_val;
}

SLV2_API
bool
slv2_value_is_bool(SLV2Value value)
{
	return (value && value->type == SLV2_VALUE_BOOL);
}

SLV2_API
bool
slv2_value_as_bool(SLV2Value value)
{
	assert(value);
	assert(slv2_value_is_bool(value));
	return value->val.bool_val;
}