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#!/usr/bin/python3
"""
Delete extraneous events from the database that have no image (and consequently no description)
"""
import argparse
import sqlite3
DB_FILE = 'data.db'
def reduceData(dbFile: str) -> None:
dbCon = sqlite3.connect(dbFile)
dbCur = dbCon.cursor()
#
print('Getting events to delete')
eventsToDel = set()
query = 'SELECT events.id FROM events LEFT JOIN event_imgs ON events.id = event_imgs.id WHERE event_imgs.id IS NULL'
for (eventId,) in dbCur.execute(query):
eventsToDel.add(eventId)
#
print('Deleting events')
iterNum = 0
for eventId in eventsToDel:
iterNum += 1
if iterNum % 1e5 == 0:
print(f'At iteration {iterNum}')
#
dbCur.execute('DELETE from events where id = ?', (eventId,))
dbCur.execute('DELETE from pop where id = ?', (eventId,))
#
dbCon.commit()
dbCon.close()
if __name__ == '__main__':
parser = argparse.ArgumentParser(description=__doc__, formatter_class=argparse.RawDescriptionHelpFormatter)
args = parser.parse_args()
#
reduceData(DB_FILE)
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