using System;
using System.Collections.Generic;

using System.Text;
using COSXML.Common;
using COSXML.Network;
using COSXML.Log;
using COSXML.Auth;
using COSXML.Utils;
/**
* Copyright (c) 2018 Tencent Cloud. All rights reserved.
* 11/2/2018 1:05:09 PM
* bradyxiao
*/
namespace COSXML.Model
{
    /**
     * cos request base class, all cos operator must be extended this.
     * 
     * request method | request path | query parameters
     * request headers
     * request body
     * 
     * special:
     * cos sign;
     */
    public abstract class CosRequest
    {
        private static string TAG = typeof(CosRequest).FullName;

        protected Request realRequest;

        /// <summary>
        /// isHttps = true, https 请求; isHttps = false, http 请求； default isHttps = false.
        /// </summary>
        protected bool? isHttps = null;

        /// <summary>
        /// cos api 请求对应的 http method.
        /// </summary>
        protected string method = CosRequestMethod.GET;

        /// <summary>
        /// http 请求url中 path 部分.
        /// </summary>
        protected string path;

        /// <summary>
        /// http 请求url中 query 部分.
        /// </summary>
        protected Dictionary<string, string> queryParameters = new Dictionary<string,string>();

        /// <summary>
        /// http 请求 header 部分.
        /// </summary>
        protected Dictionary<string, string> headers = new Dictionary<string,string>();

        /// <summary>
        /// cos 服务的 appid.
        /// </summary>
        protected string appid;

        /// <summary>
        /// cos 服务签名的签名源部分.
        /// </summary>
        protected CosXmlSignSourceProvider cosXmlSignSourceProvider = new CosXmlSignSourceProvider();

        /// <summary>
        /// needMD5 = true, 请求中带上 Content-Md5; needMd5 = false, 请求中不带 Content-Md5; defalut needMd5 = false.
        /// </summary>
        protected bool needMD5 = true;

        /// <summary>
        /// 请求预签名URL
        /// </summary>
        protected string requestUrlWithSign = null;

        public CosXmlConfig serviceConfig {get; set;}

        /// <summary>
        /// http or https for cos request.
        /// </summary>
        public bool? IsHttps 
        {
            get { return isHttps; }
            set { isHttps = value; }
        }

        /// <summary>
        /// http method
        /// </summary>
        public string Method
        {
            get { return method; }
            private set { }
        }

        /// <summary>
        /// path of http url.
        /// </summary>
        public string RequestPath 
        {
            get { return path; }
            private set { }
        }

        /// <summary>
        /// query of http url.
        /// </summary>
        /// <returns></returns>
        public virtual Dictionary<string, string> GetRequestParamters()
        {
            return queryParameters;
        }

        /// <summary>
        /// http request header
        /// </summary>
        /// <returns></returns>
        public virtual Dictionary<string, string> GetRequestHeaders()
        {
            return headers;
        }

        /// <summary>
        /// add query parameter for cos request, and cover the current value if it exists with the key.
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        public void SetQueryParameter(string key, string value)
        {
            SetQueryParameter(key, value, true);
        }

        /// <summary>
        /// url 部分都统一 url encode
        /// </summary>
        /// <param name="key"></param>
        /// <param name="value"></param>
        /// <param name="isNeedUrlEncode"></param>
        public void SetQueryParameter(string key, string value, bool isNeedUrlEncode)
        {
            try
            {
                if (value == null) value = "";
                if (isNeedUrlEncode)
                {
                    value = URLEncodeUtils.Encode(value);
                }
                queryParameters.Add(key, value);
            }
            catch (ArgumentNullException)
            {
                QLog.D(TAG, "SetQueryParameter: key ==null");
            }
            catch (ArgumentException)
            {
                queryParameters[key] = value; // cover the current value
            }
        }

        /// <summary>
        /// add header for cos request, and cover the current value, if it exists with the key.
        /// </summary>
        /// <param name="key"> header: key </param>
        /// <param name="value"> header: value</param>
        public void SetRequestHeader(string key, string value)
        {
            SetRequestHeader(key, value, false);
        }
        /// <summary>
        /// header 默认不 encode
        /// </summary>
        /// <param name="key">不能为null 即不包含空格,即 位于(\u0020, \u007F)，超过这个范围，urlencode</param>
        /// <param name="value">可以为null，为空，且位于(\u001f，\u007F) 和 '\t',超过这个范围，urlencode</param>
        /// <param name="isNeedUrlEncode"></param>
        public void SetRequestHeader(string key, string value, bool isNeedUrlEncode)
        {
            try
            {
                if (value == null) value = "";
                if (isNeedUrlEncode)
                {
                    value = URLEncodeUtils.Encode(value);
                }
                headers.Add(key, value);
            }
            catch (ArgumentNullException)
            {
                QLog.D(TAG, "SetRequestHeader: key ==null");
            }
            catch (ArgumentException)
            {
                headers[key] = value; // cover the current value
            }
        }

        /// <summary>
        /// set appid for cos.
        /// </summary>
        /// <param name="appid"> cos appid </param>
        public string APPID
        {
            get { return this.appid; }
            set { this.appid = value; }
        }

        /// <summary>
        /// 是否带上content-md5
        /// </summary>
        public bool IsNeedMD5
        {
            get { return needMD5; }
            set { needMD5 = value; }
        }

        /// <summary>
        /// return the host for cos request
        /// </summary>
        /// <returns>host(string)</returns>
        public abstract string GetCOSHost();

        /// <summary>
        /// return the host for cos request
        /// </summary>
        /// <returns>host(string)</returns>
        public abstract string GetHost();

        /// <summary>
        /// return the body for cos request. such as upload file.
        /// </summary>
        /// <returns> <see cref="COSXML.Network.RequestBody"/></returns>
        public abstract RequestBody GetRequestBody();

        /// <summary>    
        ///   check parameter for cos.
        /// </summary>
        /// <exception cref="COSXML.CosException.CosClientException"></exception>
        public abstract void CheckParameters();

        /// <summary>
        /// 设置签名的有效期： [signStartTimeSecond, signStartTimeSecond + durationSecond]
        /// </summary>
        /// <param name="signStartTimeSecond"></param>
        /// <param name="durationSecond"></param>
        public virtual void SetSign(long signStartTimeSecond, long durationSecond)
        {
            if (cosXmlSignSourceProvider == null) cosXmlSignSourceProvider = new CosXmlSignSourceProvider();
            cosXmlSignSourceProvider.SetSignTime(signStartTimeSecond, durationSecond);
        }

        /// <summary>
        /// 计算签名时，带上头部header 和查询参数 query验证.
        /// 设置签名的有效期： [signStartTimeSecond, signStartTimeSecond + durationSecond]
        /// </summary>
        /// <param name="signStartTimeSecond"></param>
        /// <param name="durationSecond"></param>
        /// <param name="headerKeys"></param>
        /// <param name="queryParameterKeys"></param>
        public virtual void SetSign(long signStartTimeSecond, long durationSecond, List<string> headerKeys, List<string> queryParameterKeys)
        {
            if (cosXmlSignSourceProvider == null) cosXmlSignSourceProvider = new CosXmlSignSourceProvider();
            cosXmlSignSourceProvider.SetSignTime(signStartTimeSecond, durationSecond);
            cosXmlSignSourceProvider.AddHeaderKeys(headerKeys);
            cosXmlSignSourceProvider.AddParameterKeys(queryParameterKeys);
        }

        /// <summary>
        /// 直接设置签名串.
        /// </summary>
        /// <param name="sign"></param>
        public virtual void SetSign(string sign)
        {
            SetRequestHeader(CosRequestHeaderKey.AUTHORIZAIION, sign);
        }

        /// <summary>
        /// 返回签名数据源
        /// </summary>
        /// <returns></returns>
        public virtual CosXmlSignSourceProvider GetSignSourceProvider()
        {
            return cosXmlSignSourceProvider;
        }

        /// <summary>
        /// 设置预签名URL
        /// </summary>
        /// <param name="requestSignURL"></param>
        public string RequestURLWithSign
        {
            get { return requestUrlWithSign; }
            set { requestUrlWithSign = value; }
        }

        public void BindRequest(Request request)
        {
            this.realRequest = request;
        }

        public void Cancel()
        {
            if (realRequest != null)
            {
                realRequest.Cancel();
            }
        }
    }
}