/*
 * Copyright 2008-2019 Max Kellermann <max.kellermann@gmail.com>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *
 * - 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 BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * ``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
 * FOUNDATION OR CONTRIBUTORS 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.
 */

#include "UriRelative.hxx"
#include "StringAPI.hxx"

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

bool
uri_is_child(const char *parent, const char *child) noexcept
{
#if !CLANG_CHECK_VERSION(3,6)
	/* disabled on clang due to -Wtautological-pointer-compare */
	assert(parent != nullptr);
	assert(child != nullptr);
#endif

	const size_t parent_length = strlen(parent);
	return memcmp(parent, child, parent_length) == 0 &&
		child[parent_length] == '/';
}


bool
uri_is_child_or_same(const char *parent, const char *child) noexcept
{
	return StringIsEqual(parent, child) || uri_is_child(parent, child);
}

std::string
uri_apply_base(const std::string &uri, const std::string &base) noexcept
{
	if (uri.front() == '/') {
		/* absolute path: replace the whole URI path in base */

		auto i = base.find("://");
		if (i == base.npos)
			/* no scheme: override base completely */
			return uri;

		/* find the first slash after the host part */
		i = base.find('/', i + 3);
		if (i == base.npos)
			/* there's no URI path - simply append uri */
			i = base.length();

		return base.substr(0, i) + uri;
	}

	std::string out(base);
	if (out.back() != '/')
		out.push_back('/');

	out += uri;
	return out;
}