// it expects the following , and if not present, will send out an error.
// msg should have the following properties : table_name, sys_id, column_mapping,column_name.
var POST_Attachment = Class.create();
POST_Attachment.prototype = {
    initialize: function(msg) {


        this.body = msg;
        this.table_name = msg["table_name"];
        this.key = msg["key"];
        this.base64Encode = msg["base64Encode"];
        this.column_name = msg["column_name"];
        this.encrypted = msg["encrypted"];
        this.file_name = msg["file_name"];
        this.content_type = msg["content_type"];


        // Only for Kenexa handling.
        this.file_type = '';
        this.file_column_mapping = '';


        JSUtil.logObject(msg, "POST Attachment");


    },


    // responsible for attaching the file.


    attach: function() {


        // (1) check for all mandatory fields.
        if (JSUtil.nil(this.table_name) || JSUtil.nil(this.key) || JSUtil.nil(this.base64Encode) || JSUtil.nil(this.column_name) || JSUtil.nil(this.encrypted) || JSUtil.nil(this.file_name)) {
            return this.prepareMessage("failure", "mandatory_not_found");
        }




        // (2) get the key's record from ServiceNow.


        var record = this.getTableRecord();




        //(3) if no such record if found, raise an error.


        if (record == -1) {
            return this.prepareMessage("failure", "key_error");
        }




        // write the record.
        var document = GlideStringUtil.base64DecodeAsBytes(this.base64Encode);

        var attachment = new Attachment();

        attachment_sys_id = attachment.write(this.table_name, record.getValue("sys_id"), this.file_name, this.content_type, document);
        //take the attachment_sys_id and encrypt it:
        if (this.encrypted == "true") {
            new OB_EncryptDecryptUtils(attachment_sys_id).encrypt();
        }




        //return the final status message.
        return this.prepareMessage("success", "success");
    },


    // getting table's record to which the attachment needs to be attached.


    getTableRecord: function() {


        var gr = new GlideRecord(this.table_name);
        gr.addQuery(this.column_name, this.key);
        gr.query();
        if (gr.next()) {
            gs.log("returning sys_id  " + gr.getValue("sys_id"));
            return gr;
        }


        return -1;
    },


    // preparing the error that needs to be sent back.
    prepareMessage: function(status, message) {
        var o = {};


        o["status"] = POST_Attachment.status_code[status];
        o["message"] = POST_Attachment.error_messages[message];


        return o;
    },


    get_code: function(file_name) {
        // split the file into three pieces and give me the second piece.
        var file_name_arr = file_name.split("-");
        return file_name_arr[0];
    },

    extractDateAndCompare: function(file_name1, file_name2) {

        var date1 = file_name1.split("-")[2];
        var date2 = file_name2.split("-")[2];

        if (this.extractDate(date1) > this.extractDate(date2)) {
            return file_name1;
        } else if (this.extractDate(date1) < this.extractDate(date2)) {
            return file_name2;
        } else {
            return file_name1
        }
    },


    extractDate: function(date) {
        var dateObj = new Date(date.replace(
            /^(\d{4})(\d\d)(\d\d)(\d\d)(\d\d)(\d\d)$/,
            '$4:$5:$6 $2/$3/$1'
        ));
        return dateObj;
    },




    type: 'POST_Attachment'
};


POST_Attachment.error_messages = {
    "mandatory_not_found": "Mandatory columns are missing.",
    "success": "Record successfully updated.",
    "logSuccess": "Successfully updated error logs.",
    "failure": "Record update failed.",
    "key_error": "key not found in table.",
    "right_attachments_not_found": "The right attachments weren't found in the table."


};


POST_Attachment.status_code = {
    "success": 1,
    "failure": -1
};