#!/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('--call', '-c',
            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('Add colums in tables region and departement')
        t.start('Update tables')
        try:
            curs.execute(""" 
                ALTER TABLE %(schema)s.region 
                ADD COLUMN IF NOT EXISTS population INT;
                """,
                {'schema':AsIs(args.schema_name)})

            curs.execute(""" 
                ALTER TABLE %(schema)s.departement 
                ADD COLUMN IF NOT EXISTS population INT;
                """,
                {'schema':AsIs(args.schema_name)})
            conn.commit()
        except Exception as e:
            logger.error('Something goes wrong updating tables: {}'.format(
                e
            ))
        t.stop()
        
        logging.debug('Add procedure.')
        t.start('Add procedure')
        try:
            curs.execute("""
                CREATE OR REPLACE PROCEDURE %(schema)s.PRC_POP_REG_DEP()
                LANGUAGE plpgsql
                AS $$
                DECLARE 
                REC RECORD;
                BEGIN

                FOR REC IN (SELECT id_departement, ncc, SUM valeur
                        FROM %(schema)s.view_indicateur_dep v
                        WHERE id_indicateur = 1
                        AND date_debut = '2018') LOOP

                    UPDATE %(schema)s.departement
                    SET population = REC.valeur
                    WHERE id_departement = REC.id_departement;

                END LOOP;

                FOR REC IN (SELECT reg, SUM(population) valeur
                        FROM %(schema)s.departement d 
                        GROUP BY reg) LOOP

                UPDATE %(schema)s.region
                SET population = REC.valeur
                WHERE reg = REC.reg;

                END LOOP;
                END;
                $$;""",
                {'schema':AsIs(args.schema_name)})
            conn.commit()
        except Exception as e:
            logger.error('Something goes wrong updating tables: {}'.format(
                e
            ))
        t.stop()

    if args.call:
        t.start('Call procedure')
        with conn.cursor() as curs:
            try:
                curs.execute("CALL %(schema)s.PRC_POP_REG_DEP()",
                    {'schema':AsIs(args.schema_name)}
                )
                conn.commit()
            except Exception as e:
                logger.error(
                    'something goes wrong on procedure call: {}'.format(e))
        t.stop()