var isRootCAFileExists = require("./certMgr.js").isRootCAFileExists(),
    interceptFlag = false;

module.exports = {
    summary:function(){
        var tip = "the default rule for anyproxy, support : CORS. ";
        if(!isRootCAFileExists){
            tip += "\nRoot CA does not exist, will not intercept any https requests.";
        }
        return tip;
    },

    shouldUseLocalResponse : function(req,reqBody){
        //intercept all options request
        if(req.method == "OPTIONS"){
            return true;
        }else{
            return false;
        }
    },

    dealLocalResponse : function(req,reqBody,callback){
        if(req.method == "OPTIONS"){
            callback(200,mergeCORSHeader(req.headers),"");
        }
    },

    replaceRequestProtocol:function(req,protocol){
    },

    replaceRequestOption : function(req,option){
    },

    replaceRequestData: function(req,data){
    },

    replaceResponseStatusCode: function(req,res,statusCode){
    },

    replaceResponseHeader: function(req,res,header){
        return mergeCORSHeader(req.headers, header);
    },

    // Deprecated
    // replaceServerResData: function(req,res,serverResData){ 
    //     return serverResData;
    // },

    replaceServerResDataAsync: function(req,res,serverResData,callback){
        callback(serverResData);
    },

    pauseBeforeSendingResponse: function(req,res){
    },

    shouldInterceptHttpsReq:function(req){
        return interceptFlag;
    },

    //[beta]
    //fetch entire traffic data
    fetchTrafficData: function(id,info){},

    //[internal]
    customMenu:[
        {
            name    :"test",
            handler :function(){}
        },{
            name    :"second-test",
            handler :function(){}
        }
    ],

    setInterceptFlag:function(flag){
        interceptFlag = flag && isRootCAFileExists;
    }

};

function mergeCORSHeader(reqHeader,originHeader){
    var targetObj = originHeader || {};

    delete targetObj["Access-Control-Allow-Credentials"];
    delete targetObj["Access-Control-Allow-Origin"];
    delete targetObj["Access-Control-Allow-Methods"];
    delete targetObj["Access-Control-Allow-Headers"];

    targetObj["access-control-allow-credentials"] = "true";
    targetObj["access-control-allow-origin"]      = reqHeader['origin'] || reqHeader['Origin'] || "-___-||";
    targetObj["access-control-allow-methods"]     = "GET, POST, PUT";
    targetObj["access-control-allow-headers"]     = reqHeader['access-control-request-headers'] || "-___-||";

    return targetObj;
}