#!/usr/bin/env python
import sys
import os
import re
# import time
import logging
import argparse as arg
import psycopg2 as pg
from psycopg2.extensions import AsIs

from classes.CustomFormater import CustomFormatter
from classes.Timer import Timer

import locale
locale.setlocale(locale.LC_ALL, 'fr_FR.UTF-8')

# Schema name is NAMEDATALEN-1 (PGSQL source code)
#  -> src/include/pg_config_manual.h
def check_schema_name(arg_value, pat=re.compile(r"^[a-z0-9A-Z]{1,63}$")):
    if not pat.match(arg_value):
        raise ValueError
    return arg_value


def parse_args():
    """
    Parse arguments
    """
    parser = arg.ArgumentParser('Process csv files from INSEE')

    parser.add_argument('--source', '-s', 
            help='csv source directory',
            default='exports')

    parser.add_argument('--connection-file', '-f', 
            help='Postgresql connexion file',
            default='.pgconn'
    )
    
    # As whe use AsIs function to not include '' in our sql queries for schema
    # name, me mus ensure that it is not contains SQL special characters 
    # like comments --, final coma etc and avoid SQL injection
    parser.add_argument('--schema-name',
            help='Database schema name',
            type=check_schema_name,
            default='insee'
    )

    parser.add_argument('--test', '-t',
            help='test view, get 10 record of each',
            action='store_true'
    )

    debug_group = parser.add_mutually_exclusive_group()
    debug_group.add_argument('--verbose', '-V',
            help='Verbose output',
            action='store_true')
    debug_group.add_argument('--debug', '-d',
            help='Activate debug mode',
            action='store_true')
    return parser.parse_args()

if __name__ == '__main__':
    args = parse_args()
    #logging.basicConfig(level=logging.DEBUG)
    logger = logging.getLogger()
    tty_handler = logging.StreamHandler()

    # create console handler with a higher log level
    tty_handler.setFormatter(CustomFormatter())
    logger.addHandler(tty_handler)
    
    if args.verbose is True:
        logger.setLevel(logging.INFO)
        logger.info('VERBOSE mode activated')
    
    if args.debug is True:
        logger.setLevel(logging.DEBUG)
        logger.debug('DEBUG mode activated')
    
    logging.debug('Import pgsql connection file {}'.format(args.connection_file))
    with open(args.connection_file) as cf:    
        pg_conn = cf.read()
    
    t = Timer(logger=logger.info)
    conn = pg.connect(pg_conn)
    with conn.cursor() as curs:
        
        logger.debug('Create trigger on region and departement')
        t.start('dep reg trigger')
        try:
            curs.execute("""
                
                CREATE OR REPLACE FUNCTION %(schema)s.block_maj_reg_dep() 
                RETURNS TRIGGER AS $bloquage$
                BEGIN
                RAISE EXCEPTION 
                    'Mise à jour non autorisé';
                END;
                $bloquage$ language plpgsql;

                CREATE TRIGGER TRG_BLOQ_MAJ_REG 
                    BEFORE INSERT OR UPDATE OR DELETE ON %(schema)s.region 
            
                FOR EACH ROW EXECUTE PROCEDURE %(schema)s.block_maj_reg_dep();

                CREATE TRIGGER TRG_BLOQ_MAJ_DEP 
                    BEFORE INSERT OR UPDATE OR DELETE ON %(schema)s.departement 
            
                    FOR EACH ROW EXECUTE PROCEDURE %(schema)s.block_maj_reg_dep();
                """,
                {'schema':AsIs(args.schema_name)})
            conn.commit()
        except Exception as e:
            logger.error('Something goes wrong on block trigger: {}'.format(e))
            sys.exit(1)
        t.stop()

        logger.debug('Add procedure to modify pop. values on region and dep')
        t.start('Add fun_maj_pop() procedure')
        try:
            curs.execute(""" 
                CREATE OR REPLACE FUNCTION %(schema)s.FUN_MAJ_POP() 
                    RETURNS TRIGGER AS $maj_population$
                BEGIN

                ALTER TABLE %(schema)s.region DISABLE TRIGGER TRG_BLOQ_MAJ_REG;
                ALTER TABLE %(schema)s.departement DISABLE TRIGGER TRG_BLOQ_MAJ_DEP;

                IF(TG_OP = 'INSERT' AND NEW.ID_INDICATEUR = 1 
                  AND (NEW.VALEUR <> 0 OR NEW.VALEUR <> NULL)) THEN
                    CALL %(schema)s.PRC_POP_REG_DEP();
                END IF;

                IF(TG_OP = 'UPDATE' AND NEW.ID_INDICATEUR = 1 
                  AND NEW.VALEUR <> OLD.VALEUR) THEN
                    CALL %(schema)s.PRC_POP_REG_DEP();
                END IF;

                IF(TG_OP = 'DELETE' AND OLD.ID_INDICATEUR = 1 
                  AND (OLD.VALEUR <> 0 OR OLD.VALEUR <> NULL)) THEN
                    CALL %(schema)s.PRC_POP_REG_DEP();
                END IF;

                ALTER TABLE %(schema)s.region ENABLE TRIGGER TRG_BLOQ_MAJ_REG;
                ALTER TABLE %(schema)s.departement ENABLE TRIGGER TRG_BLOQ_MAJ_DEP;

                RETURN NULL;
                END;
                $maj_population$ language plpgsql;
            """,
            {'schema':AsIs(args.schema_name)})
            conn.commit()
        except Exception as e:
            logger.error(
                'Something goes wrong on fun_maj_pop procedure: {}'.format(e)
            )
            sys.exit(1)
        t.stop()

        logger.debug('Add trigger on statistique tto update pop. values')
        t.start('Add fun_maj_pop() procedure')
        try:
            curs.execute("""
                CREATE TRIGGER TRG_MAJ_POP 
                AFTER INSERT OR UPDATE OR DELETE ON %(schema)s.statistique 
                FOR EACH ROW EXECUTE PROCEDURE %(schema)s.FUN_MAJ_POP();
            """,
            {'schema':AsIs(args.schema_name)})
            conn.commit()
        except Exception as e:
            logger.error(
                'Something goes wrong on statistique trigger: {}'.format(e)
            )
            sys.exit(1)
        t.stop()