#!/usr/bin/python3

import sys, re
import sqlite3

usageInfo =  f"usage: {sys.argv[0]}\n"
usageInfo += "Reads Wikimedia enwiki data from enwiki/, and node and name data"
usageInfo += "from a sqlite database, and adds description data for names that\n"
usageInfo += "don't have them.\n"
if len(sys.argv) > 1:
	print(usageInfo, file=sys.stderr)
	sys.exit(1)

enwikiDb = "enwiki/enwikiData.db"
dbFile = "data.db"

# Open dbs
enwikiCon = sqlite3.connect(enwikiDb)
enwikiCur = enwikiCon.cursor()
dbCon = sqlite3.connect(dbFile)
dbCur = dbCon.cursor()
# Get node names without descriptions
print("Getting node names")
nodeNames = set()
query = "SELECT nodes.name FROM nodes LEFT JOIN descs ON nodes.name = descs.name WHERE desc IS NULL"
for row in dbCur.execute(query):
	nodeNames.add(row[0])
print("Found {} names".format(len(nodeNames)))
# Find page id for each node name
print("Getting node page-ids")
nodeToPageId = {}
iterNum = 0
for name in nodeNames:
	iterNum += 1
	if iterNum % 1e4 == 0:
		print("At iteration {}".format(iterNum))
	#
	row = enwikiCur.execute("SELECT id FROM pages WHERE pages.title = ? COLLATE NOCASE", (name,)).fetchone()
	if row != None:
		nodeToPageId[name] = row[0]
# Resolve redirects
print("Resolving redirects")
redirectingNames = set()
iterNum = 0
for (name, pageId) in nodeToPageId.items():
	iterNum += 1
	if iterNum % 1000 == 0:
		print("At iteration {}".format(iterNum))
	#
	row = enwikiCur.execute(
		"SELECT pages.id FROM redirects INNER JOIN pages ON redirects.target = pages.title WHERE redirects.id = ?",
		(pageId,)).fetchone()
	if row != None:
		nodeToPageId[name] = row[0]
		redirectingNames.add(name)
# Add descriptions for each node
print("Adding description data")
iterNum = 0
for (name, pageId) in nodeToPageId.items():
	iterNum += 1
	if iterNum % 1000 == 0:
		print("At iteration {}".format(iterNum))
	#
	row = enwikiCur.execute("SELECT desc FROM descs where descs.id = ?", (pageId,)).fetchone()
	if row != None:
		dbCur.execute("INSERT INTO descs VALUES (?, ?, ?, ?, ?)",
			(name, row[0], 1 if name in redirectingNames else 0, pageId, 0))
# Close dbs
dbCon.commit()
dbCon.close()
enwikiCon.commit()
enwikiCon.close()