"use strict";
var CloneEngine = require('cloneengine');
/////////////////////////////////////////// CLONE OPERATION OPTIONS /////////////////////////////////////////

//----Source Database Connection Setup----
const SOURCE_DB = {
        dbMake          : 'postgres',
        database        : 'myPostgresDb',
        user            : 'me',
        password        : 'myPassWord',
        host            : 'my.db.com'
      };


//----Destination Database Connection Setup----
const DESTINATION_DB = {// must have read, write, delete permissions
        dbMake          : 'oracle',
        database        : 'myOracleDb',
        user            : 'me',
        password        : 'myPassWord',
        host            : 'myother.db.com',
        port            : 12345,
        service         : 'myother.db.com'
      };


//---- CloneEngine Options----
const OVERWRITE_FOR_ALL_OPS = 'yes'; // allows CloneEngine to delete existing (Destination Db) table and replace with new one
const TIMEZONE = 'local'; // uses ISO Standard Timestamp... choose either "utc" or "local"
const DISPLAY_MESSAGES_ON_CONSOLE = 'yes'; // configures CloneEngine messages to display on console
const RUN_TYPE = 'synchronous'; // choose to run operations either "synchronous" or "asynchronous"
const STOP_ON_ERROR = 'yes'; // when running synchronously... upon an error: if 'yes' is selected, no further operations will be run


/////////////////////////////////////////////// CLONEENGINE LOGIC /////////////////////////////////////////////

//--------------- Handle emitter output messages---------
//templates for handling output from cloneEngine emitters
var handleEmitterOutput = function(msg){

  //configure output message on console...
  if (DISPLAY_MESSAGES_ON_CONSOLE === 'yes') {
    if(msg.msgType === 'operation'){console.log(msg);}
    else if(msg.msgType === 'ERROR!'){
      //Error just adds a red font
      console.log(
        msg.activityId +' '+msg.operationId+' '+msg.step+' '+msg.operation+' \x1b[31m'+msg.msgType+'\x1b[0m'+' '+msg.time+' => '+msg.description);
    }else{
      console.log(
        msg.activityId +' '+msg.operationId+' '+msg.step+' '+msg.operation+' '+msg.msgType+' '+msg.time+' => '+msg.description);
    }
  }
};

//----------------- Create a Clone Engine---------------
function runCloneEngineOperation (plan) {

  //initialize a new cloning engine
  let engine = new CloneEngine(SOURCE_DB,DESTINATION_DB,TIMEZONE);

  //configure CloneEngine listeners and how to handle outputs
  engine.on('start',function(msg){handleEmitterOutput(msg);})
  engine.on('connection',function(msg){handleEmitterOutput(msg);})
  engine.on('rowsToProcess',function(msg){handleEmitterOutput(msg);})
  engine.on('process',function(msg){handleEmitterOutput(msg);})
  engine.on('bytesCached',function(msg){handleEmitterOutput(msg);})
  engine.on('countsMatch',function(msg){handleEmitterOutput(msg);})
  engine.on('finish',function(msg){handleEmitterOutput(msg);})
  engine.on('ERROR!',function(msg){handleEmitterOutput(msg);})
  engine.on('operation',function(msg){handleEmitterOutput(msg);})

  //run engine
  engine.run(plan);

  //upon completion of operation resolve promise
  return new Promise(function(resolve, reject){
    STOP_ON_ERROR == 'no' ?
      engine.on('ERROR!',function(msg){if (msg){resolve(msg);}}) :
      engine.on('ERROR!',function(msg){if (msg){reject(msg);}})
    engine.on('finish',function(msg){if (msg) {resolve(true);}})
  })
};


////////////////////////////////////// RUN ENGINE OPERATIONS ////////////////////////////////////

//Run CloneEngine Operations (synchronously)...
if (RUN_TYPE === 'synchronous') {

  runCloneEngineOperation({
    sourceTableName                     : 'table1',
    destinationTableName                : 'clone_a',
    overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })
  .then(function(){
    runCloneEngineOperation({
      sourceTableName                     : 'table2',
      destinationTableName                : 'clone_b',
      overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })
  .then(function(){
    runCloneEngineOperation({
      sourceTableName                     : 'table3',
      destinationTableName                : 'clone_c',
      overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })
  .then(function(){
    runCloneEngineOperation({
      sourceTableName                     : 'table4',
      destinationTableName                : 'clone_d',
      overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })
  }).catch(function(err){console.log(err);})
  }).catch(function(err){console.log(err);})
  }).catch(function(err){console.log(err);});
}

//Run CloneEngine Operations (asynchronously)...
if (RUN_TYPE === 'asynchronous') {

  runCloneEngineOperation({
    sourceTableName                     : 'table1',
    destinationTableName                : 'clone_a',
    overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })

  runCloneEngineOperation({
    sourceTableName                     : 'table2',
    destinationTableName                : 'clone_b',
    overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })

  runCloneEngineOperation({
    sourceTableName                     : 'table3',
    destinationTableName                : 'clone_c',
    overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })

  runCloneEngineOperation({
    sourceTableName                     : 'table4',
    destinationTableName                : 'clone_d',
    overwriteDestTblIfExists            : OVERWRITE_FOR_ALL_OPS
  })
}