/*
 * Copyright 2002-2014 the original author or authors.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.springframework.security.test.context.support;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import org.springframework.security.authentication.UsernamePasswordAuthenticationToken;
import org.springframework.security.core.Authentication;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.authority.SimpleGrantedAuthority;
import org.springframework.security.core.context.SecurityContext;
import org.springframework.security.core.context.SecurityContextHolder;
import org.springframework.security.core.userdetails.User;
import org.springframework.util.StringUtils;

/**
 * A {@link WithUserDetailsSecurityContextFactory} that works with {@link WithMockUser}.
 *
 * @author Rob Winch
 * @since 4.0
 * @see WithMockUser
 */
final class WithMockUserSecurityContextFactory implements
		WithSecurityContextFactory<WithMockUser> {

	public SecurityContext createSecurityContext(WithMockUser withUser) {
		String username = StringUtils.hasLength(withUser.username()) ? withUser
				.username() : withUser.value();
		if (username == null) {
			throw new IllegalArgumentException(withUser
					+ " cannot have null username on both username and value properites");
		}

		List<GrantedAuthority> grantedAuthorities = new ArrayList<>();
		for (String authority : withUser.authorities()) {
			grantedAuthorities.add(new SimpleGrantedAuthority(authority));
		}

		if(grantedAuthorities.isEmpty()) {
			for (String role : withUser.roles()) {
				if (role.startsWith("ROLE_")) {
					throw new IllegalArgumentException("roles cannot start with ROLE_ Got "
							+ role);
				}
				grantedAuthorities.add(new SimpleGrantedAuthority("ROLE_" + role));
			}
		} else if(!(withUser.roles().length == 1 && "USER".equals(withUser.roles()[0]))) {
			throw new IllegalStateException("You cannot define roles attribute "+ Arrays.asList(withUser.roles())+" with authorities attribute "+ Arrays.asList(withUser.authorities()));
		}

		User principal = new User(username, withUser.password(), true, true, true, true,
				grantedAuthorities);
		Authentication authentication = new UsernamePasswordAuthenticationToken(
				principal, principal.getPassword(), principal.getAuthorities());
		SecurityContext context = SecurityContextHolder.createEmptyContext();
		context.setAuthentication(authentication);
		return context;
	}
}
