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

  Redistribution and use in source and binary forms, with or without
  modification, are permitted provided that the following conditions are met:

  1. Redistributions of source code must retain the above copyright notice,
     this list of conditions and the following disclaimer.

  2. Redistributions in binary form must reproduce the above copyright
     notice, this list of conditions and the following disclaimer in the
     documentation and/or other materials provided with the distribution.

  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES,
  INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
  AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
  AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY,
  OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  THE POSSIBILITY OF SUCH DAMAGE.
*/

#define _XOPEN_SOURCE 500

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

#include "slv2_internal.h"

char*
slv2_strjoin(const char* first, ...)
{
	size_t  len    = strlen(first);
	char*   result = malloc(len + 1);

	memcpy(result, first, len);

	va_list args;
	va_start(args, first);
	while (1) {
		const char* const s = va_arg(args, const char *);
		if (s == NULL)
			break;

		const size_t this_len = strlen(s);
		result = realloc(result, len + this_len + 1);
		memcpy(result + len, s, this_len);
		len += this_len;
	}
	va_end(args);

	result[len] = '\0';

	return result;
}

char*
slv2_strdup(const char* str)
{
	const size_t len = strlen(str);
	char*        dup = malloc(len + 1);
	memcpy(dup, str, len + 1);
	return dup;
}

const char*
slv2_uri_to_path(const char* uri)
{
#ifdef __WIN32__
	if (!strncmp(uri, "file:///", (size_t)8)) {
		return (char*)(uri + 8);
#else
	if (!strncmp(uri, "file://", (size_t)7)) {
		return (char*)(uri + 7);
#endif
	} else {
		return NULL;
	}
}

/** Return the current LANG converted to Turtle (i.e. RFC3066) style.
 * For example, if LANG is set to "en_CA.utf-8", this returns "en-ca".
 */
char*
slv2_get_lang()
{
	const char* const env_lang = getenv("LANG");
	if (!env_lang || !strcmp(env_lang, "")
	    || !strcmp(env_lang, "C") || !strcmp(env_lang, "POSIX")) {
		return NULL;
	}

	const size_t env_lang_len = strlen(env_lang);
	char* const  lang         = malloc(env_lang_len + 1);
	for (size_t i = 0; i < env_lang_len + 1; ++i) {
		if (env_lang[i] == '_') {
			lang[i] = '-';  // Convert _ to -
		} else if (env_lang[i] >= 'A' && env_lang[i] <= 'Z') {
			lang[i] = env_lang[i] + ('a' - 'A');  // Convert to lowercase
		} else if (env_lang[i] >= 'a' && env_lang[i] <= 'z') {
			lang[i] = env_lang[i];  // Lowercase letter, copy verbatim
		} else if (env_lang[i] >= '0' && env_lang[i] <= '9') {
			lang[i] = env_lang[i];  // Digit, copy verbatim
		} else if (env_lang[i] == '\0' || env_lang[i] == '.') {
			// End, or start of suffix (e.g. en_CA.utf-8), finished
			lang[i] = '\0';
			break;
		} else {
			SLV2_ERRORF("Illegal LANG `%s' ignored\n", env_lang);
			free(lang);
			return NULL;
		}
	}

	return lang;
}

uint8_t*
slv2_qname_expand(SLV2Plugin p, const char* qname)
{
	const size_t qname_len  = strlen(qname);
	SerdNode     qname_node = { SERD_CURIE, qname_len + 1, qname_len,
	                            (const uint8_t*)qname };

	SerdChunk uri_prefix;
	SerdChunk uri_suffix;
	if (serd_env_expand(p->world->namespaces, &qname_node, &uri_prefix, &uri_suffix)) {
		const size_t uri_len = uri_prefix.len + uri_suffix.len;
		char*        uri     = malloc(uri_len + 1);
		memcpy(uri,                  uri_prefix.buf, uri_prefix.len);
		memcpy(uri + uri_prefix.len, uri_suffix.buf, uri_suffix.len);
		uri[uri_len] = '\0';
		return (uint8_t*)uri;
	} else {
		SLV2_ERRORF("Failed to expand QName `%s'\n", qname);
		return NULL;
	}
}