if (not (group exist "0001_folder1_folder2_folder3")) {
	group add "0001_folder1_folder2_folder3";
};

script merge "folder1.folder2.folder3.step_1_source_connect.exe" true 5
  (param
  )
  "Connect to the source"
{

	# CONFIGURATION ;
	-> "[CONF_NAME_OF_THE_FLOW]" "name_of_the_flow";
	-> "[CONF_SOURCE_CM]" "demo_cm";

	# INITIALIZATION ;
	-> "[FLOW_PID]" [PID];
	
	# HANDLE ;
	try {
	
		# Flow initialization;
		stack flow_init [FLOW_PID] [CONF_NAME_OF_THE_FLOW] "{}";
		stack flow_step [FLOW_PID] 1 "source_connect...";

		tunnel connect "session_remote" {cm get [CONF_SOURCE_CM];};
		
		#Step 1 is valid;
		stack flow_step [FLOW_PID] 1 "source_connect_ok";
		
		include "folder1.folder2.folder3.step_2_extract.exe";
	
	} {

		try {tunnel disconnect "session_remote";} {} "[err]";

		#Step 1 is not valid;
		stack flow_step [FLOW_PID] 1 "source_connect_KO";
		
		# Give the error to the stack and stop the process;
		exception (1) ([global_err]);
	
	} "[global_err]";
	
} "Return nothing";
if (not (group is granted script "folder1.folder2.folder3.step_1_source_connect.exe" "0001_folder1_folder2_folder3")) {
	group grant script "folder1.folder2.folder3.step_1_source_connect.exe" "0001_folder1_folder2_folder3";
};

script merge "folder1.folder2.folder3.step_2_extract.exe" true 1
  (param
  )
  "Extract files from the source"
{

	# CONFIGURATION ;
	-> "[CONF_DIR_SOURCE]" "tmp/source";
	-> "[CONF_SOURCE_FILTER]" ".*csv";
	
	# HANDLE ;
	try {

		# Mark the flow as step 2;
		stack flow_step [FLOW_PID] 2 "extract...";

		# Create the local directory PID;
		file mkdir (concat "home/" [FLOW_PID]);

		# Get files into PID directory;
		log write (concat "Get files from '" [CONF_DIR_SOURCE] "/" [CONF_SOURCE_FILTER] "'.") OK null null;

		json load "valid_files" (tunnel execute "session_remote" (concat 
			"-> \"[CONF_DIR_SOURCE]\" \"" (mql encode [CONF_DIR_SOURCE]) "\";"
			"-> \"[CONF_SOURCE_FILTER]\" \"" (mql encode [CONF_SOURCE_FILTER]) "\";"
			(mql {
				file dir_list_regex [CONF_DIR_SOURCE] [CONF_SOURCE_FILTER] true false;
			})
		));
		
		json parse_array "valid_files" "/" "[filename]" {

			tunnel execute "session_remote" (concat 
				"-> \"[CONF_DIR_SOURCE]\" \"" (mql encode [CONF_DIR_SOURCE]) "\";"
				"-> \"[filename]\" \"" (mql encode [filename]) "\";"
				(mql {
					file reader_open "r1" (concat [CONF_DIR_SOURCE] "/" [filename]) BINARY null;
				})
			);

			file writer_open "w1" (concat "home/" [FLOW_PID] "/" [filename]) true BINARY null;

			#Parse the file;
			while (is not null (-> "[bytes]" (tunnel execute "session_remote" "file reader_get_bytes \"r1\" 402400"))) {
		
				file writer_add_bytes "w1" [bytes];
				file writer_flush "w1";
		
			};

			#Close the reader and the writer;
			tunnel execute "session_remote" "file reader_close \"r1\"";
			file writer_close "w1";
			
			log write (concat "Get file 'home/" [FLOW_PID] "/" [filename] "'.") OK null null;
		
		};

		# Delete source file;
		json parse_array "valid_files" "/" "[filename]" {

			tunnel execute "session_remote" (concat 
				"-> \"[CONF_DIR_SOURCE]\" \"" (mql encode [CONF_DIR_SOURCE]) "\";"
				"-> \"[filename]\" \"" (mql encode [filename]) "\";"
				(mql {
					file delete (concat [CONF_DIR_SOURCE] "/" [filename]);
				})
			);
			log write (concat "Remove source file '" [CONF_DIR_SOURCE] "/" [filename] "'.") OK null null;

		};
		
		tunnel disconnect "session_remote";
	
	} {

		try {tunnel disconnect "session_remote";} {} "[err]";

		#Step 2 is not valid;
		stack flow_step [FLOW_PID] 2 "extract_KO";
		
		# Give the error to the stack and stop the process;
		exception (1) ([global_err]);
	
	} "[global_err]";
	
	log write (concat (json count "valid_files" /) " file(s) to transform.") OK null null;

	if (> (json count "valid_files" /) 0) {

		#Step 2 is valid;
		stack flow_step [FLOW_PID] 2 (concat "extract_ok_" (json count "valid_files" /) "_files");
		
		json parse_array "valid_files" "/" "obj" {

			-> "[filename]" (json select "obj" /name);
		
			stack (date now) "folder1.folder2.folder3.step_3_transform.exe" "[FLOW_PID]" [FLOW_PID] "[filename]" [filename];
	
		};
		
	} {

		#Step 2 is valid;
		stack flow_step [FLOW_PID] 2 "extract_ok_zero_file";
		
		# No file into the directory;
		file delete (concat "home/" [FLOW_PID]);

	};

} "Return nothing";
if (not (group is granted script "folder1.folder2.folder3.step_2_extract.exe" "0001_folder1_folder2_folder3")) {
	group grant script "folder1.folder2.folder3.step_2_extract.exe" "0001_folder1_folder2_folder3";
};

script merge "folder1.folder2.folder3.step_3_transform.exe" true 1
  (param
  	(var "[FLOW_PID]" {true} "The flow PID" is_null:true is_empty:true "1")
  	(var "[filename]" {true} "The filename" is_null:true is_empty:true "file.csv")
  )
  "Transform the file"
{
	
	# HANDLE ;
	try {

		# Mark the flow as step 3;
		stack flow_step [FLOW_PID] 3 "transform...";

		# SQL: don't use step 3;
		log write "SQL: don't use step 3" OK null null;

		#Step 3 is valid;
		stack flow_step [FLOW_PID] 3 "transform_ok";

		stack (date now) "folder1.folder2.folder3.step_4_destination_connect.exe" "[FLOW_PID]" [FLOW_PID] "[filename]" [filename];
		
	} {

		#Step 5 is not valid;
		stack flow_step [FLOW_PID] 5 "transform_and_load_KO";
		
		# Give the error to the stack and stop the process;
		exception (1) ([global_err]);
	
	} "[global_err]";

} "Return nothing";
if (not (group is granted script "folder1.folder2.folder3.step_3_transform.exe" "0001_folder1_folder2_folder3")) {
	group grant script "folder1.folder2.folder3.step_3_transform.exe" "0001_folder1_folder2_folder3";
};

script merge "folder1.folder2.folder3.step_4_destination_connect.exe" true 5
  (param
  	(var "[FLOW_PID]" {true} "The flow PID" is_null:true is_empty:true "1")
  	(var "[filename]" {true} "The filename" is_null:true is_empty:true "file.xxx")
  )
  "Connect to the destination"
{

	# CONFIGURATION ;
	-> "[CONF_DESTINATION_CM_SQL]" "MENTDB";
	
	# HANDLE ;
	try {
	
		# Flow initialization;
		stack flow_step [FLOW_PID] 4 "destination_connect...";

		sql connect "destination_sess" {cm get [CONF_DESTINATION_CM_SQL];};
		sql auto_commit "destination_sess" false;
		
		#Step 4 is valid;
		stack flow_step [FLOW_PID] 4 "destination_connect_ok";
		
		include "folder1.folder2.folder3.step_5_load.exe";
	
	} {

		try {sql disconnect "destination_sess";} {} "[err]";

		#Step 4 is not valid;
		stack flow_step [FLOW_PID] 4 "destination_connect_KO";
		
		# Give the error to the stack and stop the process;
		exception (1) ([global_err]);
	
	} "[global_err]";
	
} "Return nothing";
if (not (group is granted script "folder1.folder2.folder3.step_4_destination_connect.exe" "0001_folder1_folder2_folder3")) {
	group grant script "folder1.folder2.folder3.step_4_destination_connect.exe" "0001_folder1_folder2_folder3";
};

script merge "folder1.folder2.folder3.step_5_load.exe" true 1
  (param
  )
  "Load file to the destination"
{

	# CONFIGURATION ;
	-> "[CONF_SOURCE_CSV_SEPARATOR]" ",";
	-> "[CONF_SOURCE_CSV_QUOTE]" "'";
	-> "[CONF_SOURCE_CSV_FORCE_COLUMN]" "A,B,C";
	-> "[CONF_DESTINATION_CM_SQL]" "MENTDB";
	-> "[CONF_DESTINATION_COMMIT_BY_NB_ROW]" 5000;
	
	# HANDLE ;
	try {

		# Mark the flow as step 5;
		stack flow_step [FLOW_PID] 5 "load...";
		
		log write (concat "Integrate the file 'home/" [FLOW_PID] "/" [filename] "' into the database '" [CONF_DESTINATION_CM_SQL] "'...") OK null null;

		-> "[index]" 0;
		-> "[index_all]" 0;
		csv parse (mql "T") (concat "home/" [FLOW_PID] "/" [filename]) (mql [CONF_SOURCE_CSV_SEPARATOR]) (mql [CONF_SOURCE_CSV_QUOTE]) (mql [CONF_SOURCE_CSV_FORCE_COLUMN]) {
			
			sql dml "destination_sess" (concat 
				"INSERT INTO `test` (
					`A`,
					`B`,
					`C`
				) VALUES (
					" (sql encode [T_A]) " ,
					" (sql encode [T_B]) " ,
					" (sql encode [T_C]) "
				);"
			);

			++ "[index]";
			++ "[index_all]";

			if (== [index] [CONF_DESTINATION_COMMIT_BY_NB_ROW]) {
				-> "[index]" 0;
				sql commit "destination_sess";
				log write (concat "Current row >>> " [index_all]) OK null null;
			};
		
		};

		sql commit "destination_sess";

		sql disconnect "destination_sess";
		
		log write (concat "Integrated.") OK null null;
		
		#Step 5 is valid;
		stack flow_step [FLOW_PID] 5 "load_ok";
		
	} {

		try {sql rollback "destination_sess";} {} "[err]";
		try {sql disconnect "destination_sess";} {} "[err]";

		#Step 5 is not valid;
		stack flow_step [FLOW_PID] 5 "load_KO";
		
		# Give the error to the stack and stop the process;
		exception (1) ([global_err]);
	
	} "[global_err]";

} "Return nothing";
if (not (group is granted script "folder1.folder2.folder3.step_5_load.exe" "0001_folder1_folder2_folder3")) {
	group grant script "folder1.folder2.folder3.step_5_load.exe" "0001_folder1_folder2_folder3";
};