#!/usr/bin/python3

import re
import bz2, sqlite3

import argparse
parser = argparse.ArgumentParser(description="""
Adds DBpedia labels/types/abstracts/etc data into a database
""", formatter_class=argparse.RawDescriptionHelpFormatter)
parser.parse_args()

labelsFile = 'labels_lang=en.ttl.bz2' # Had about 16e6 entries
idsFile = 'page_lang=en_ids.ttl.bz2'
redirectsFile = 'redirects_lang=en_transitive.ttl.bz2'
disambigFile = 'disambiguations_lang=en.ttl.bz2'
typesFile = 'instance-types_lang=en_specific.ttl.bz2'
abstractsFile = 'short-abstracts_lang=en.ttl.bz2'
dbFile = 'descData.db'
# In testing, this script took a few hours to run, and generated about 10GB

print('Creating database')
dbCon = sqlite3.connect(dbFile)
dbCur = dbCon.cursor()

print('Reading/storing label data')
dbCur.execute('CREATE TABLE labels (iri TEXT PRIMARY KEY, label TEXT)')
dbCur.execute('CREATE INDEX labels_idx ON labels(label)')
dbCur.execute('CREATE INDEX labels_idx_nc ON labels(label COLLATE NOCASE)')
labelLineRegex = re.compile(r'<([^>]+)> <[^>]+> "((?:[^"]|\\")+)"@en \.\n')
lineNum = 0
with bz2.open(labelsFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		match = labelLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		dbCur.execute('INSERT INTO labels VALUES (?, ?)', (match.group(1), match.group(2)))

print('Reading/storing wiki page ids')
dbCur.execute('CREATE TABLE ids (iri TEXT PRIMARY KEY, id INT)')
dbCur.execute('CREATE INDEX ids_idx ON ids(id)')
idLineRegex = re.compile(r'<([^>]+)> <[^>]+> "(\d+)".*\n')
lineNum = 0
with bz2.open(idsFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		match = idLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		try:
			dbCur.execute('INSERT INTO ids VALUES (?, ?)', (match.group(1), int(match.group(2))))
		except sqlite3.IntegrityError as e:
			# Accounts for certain lines that have the same IRI
			print(f'WARNING: Failed to add entry with IRI "{match.group(1)}": {e}')

print('Reading/storing redirection data')
dbCur.execute('CREATE TABLE redirects (iri TEXT PRIMARY KEY, target TEXT)')
redirLineRegex = re.compile(r'<([^>]+)> <[^>]+> <([^>]+)> \.\n')
lineNum = 0
with bz2.open(redirectsFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		match = redirLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		dbCur.execute('INSERT INTO redirects VALUES (?, ?)', (match.group(1), match.group(2)))

print('Reading/storing diambiguation-page data')
dbCur.execute('CREATE TABLE disambiguations (iri TEXT PRIMARY KEY)')
disambigLineRegex = redirLineRegex
lineNum = 0
with bz2.open(disambigFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		match = disambigLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		dbCur.execute('INSERT OR IGNORE INTO disambiguations VALUES (?)', (match.group(1),))

print('Reading/storing instance-type data')
dbCur.execute('CREATE TABLE types (iri TEXT, type TEXT)')
dbCur.execute('CREATE INDEX types_iri_idx ON types(iri)')
typeLineRegex = redirLineRegex
lineNum = 0
with bz2.open(typesFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		match = typeLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		dbCur.execute('INSERT INTO types VALUES (?, ?)', (match.group(1), match.group(2)))

print('Reading/storing abstracts')
dbCur.execute('CREATE TABLE abstracts (iri TEXT PRIMARY KEY, abstract TEXT)')
descLineRegex = labelLineRegex
lineNum = 0
with bz2.open(abstractsFile, mode='rt') as file:
	for line in file:
		lineNum += 1
		if lineNum % 1e5 == 0:
			print(f'At line {lineNum}')
		#
		if line[0] == '#':
			continue
		match = descLineRegex.fullmatch(line)
		if match is None:
			raise Exception(f'ERROR: Line {lineNum} has unexpected format')
		dbCur.execute('INSERT INTO abstracts VALUES (?, ?)',
			(match.group(1), match.group(2).replace(r'\"', '"')))

print('Closing database')
dbCon.commit()
dbCon.close()