/*-
 * ============LICENSE_START=======================================================
 * 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.
 * ============LICENSE_END=========================================================
 */

package com.woorea.openstack.base.client;

import java.util.Arrays;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.ArrayList;
import java.util.Map;

public class OpenStackRequest<R> {
    
    private OpenStackClient client;

    private String endpoint;

    private HttpMethod method;

    private StringBuilder path = new StringBuilder();

    private Map<String, List<Object>> headers = new HashMap<>();

    private Entity<?> entity;

    private Class<R> returnType;
    
    public OpenStackRequest() {
        
    }
    
    public OpenStackRequest(OpenStackClient client, HttpMethod method, CharSequence path, Entity<?> entity, Class<R> returnType) {
        this.client = client;
        this.method = method;
        this.path = new StringBuilder(path);
        this.entity = entity;
        this.returnType = returnType;
        header("Accept", "application/json");
    }

    
    public OpenStackRequest<R> endpoint(String endpoint) {
        this.endpoint = endpoint;
        return this;
    }
    
    public String endpoint() {
        return endpoint;
    }

    public OpenStackRequest<R> method(HttpMethod method) {
        this.method = method;
        return this;
    }
    
    public HttpMethod method() {
        return method;
    }
    
    public OpenStackRequest<R> path(String path) {
        this.path.append(path);
        return this;
    }
    
    public String path() {
        return path.toString();
    }

    public OpenStackRequest<R> header(String name, Object value) {
        if(value != null) {
            headers.put(name, Arrays.asList(value));
        }
        return this;
    }
    
    public Map<String, List<Object>> headers() {
        return headers;
    }
    
    public <T> Entity<T> entity(T entity, String contentType) {
        return new Entity<>(entity, contentType);
    }
    
    public Entity<?> entity() {
        return entity;
    }
    
    public <T> Entity<T> json(T entity) {
        return entity(entity, "application/json");
    }
    
    public void returnType(Class<R> returnType) {
        this.returnType = returnType;
    }
    
    public Class<R> returnType() {
        return returnType;
    }
    
    public R execute() {
        return client.execute(this);
    }
    
    public OpenStackResponse request() {
        return client.request(this);
    }

    /* (non-Javadoc)
     * @see java.lang.Object#toString()
     */
    @Override
    public String toString() {
        return "OpenStackRequest [endpoint=" + endpoint + ", method=" + method
                + ", path=" + path + ", headers=" + headers + ", entity="
                + entity + ", returnType=" + returnType + "]";
    }

    private Map<String, List<Object> > queryParams = new LinkedHashMap<>();

    public Map<String, List<Object> > queryParams() {
        return queryParams;
    }

    public OpenStackRequest<R> queryParam(String key, Object value) {
        if (queryParams.containsKey(key)) {
            List<Object> values = queryParams.get(key);
            values.add(value);
        } else {
            List<Object> values = new ArrayList<>();
            values.add(value);
            queryParams.put(key, values);
        }

        return this;
    }
    
    protected static String buildPath(String ... elements) {
        StringBuilder stringBuilder = new StringBuilder();
        for (String element : elements) {
            stringBuilder.append(element);
        }

        return stringBuilder.toString();
    }
}