#!/usr/bin/env python3
"""
When was this user last seen.
"""
import time
import threading
from datetime import datetime
from sqlite3 import OperationalError

from tools.time import relativeTime
from module import commands, example, hook, require_chanmsg


def load_database(bot):
	"""
	Loads all entries from the 'seen' table in the bot's database and
	returns them.
	"""
	data = {}
	seens = bot.db.execute("SELECT * FROM seen").fetchall()

	for seen in seens:
		nick, timestamp, channel, message = seen
		seen = (timestamp, channel, message)
		data[nick] = seen
	return data


def setup(bot):
	bot.memory["seen_lock"] = threading.Lock()
	bot.memory["seen"] = load_database(bot)
	bot.memory["seen_last_dump"] = time.time()

	con = bot.db.connect()
	cur = con.cursor()
	try:
		cur.execute("SELECT * FROM seen").fetchone()
	except OperationalError:
		cur.execute("CREATE TABLE seen("
			"nick TEXT PRIMARY KEY,"
			"timestamp INTEGER,"
			"channel TEXT,"
			"message TEXT)")
		con.commit()
	con.close()


@commands('seen')
@example(".seen Nigger -l", "Last heard from Nigger at [1997-03-12 16:30:00] "\
	+"with \"Just going to the store for some smokes babe I'll be right back\"")
@example(".seen Soma_QM", "I haven't seen Soma_QM")
def seen(bot, trigger):
	"""Reports when and where the user was last seen."""
	nick = trigger.group(3)
	last = False
	if nick == "-l" or nick == "--last":
		last = True
		nick = trigger.group(4)

	if not nick:
		return bot.say("Seen who?")

	if nick == bot.nick:
		return bot.reply("I'm right here!")

	if nick in bot.memory["seen"]:
		timestamp, channel, message = bot.memory["seen"][nick]
	else:
		return bot.msg(f"I haven't seen \x0308{nick}")

	timestamp = datetime.fromtimestamp(timestamp)
	t_format = bot.config.core.default_time_format
	timestamp = datetime.strftime(timestamp, t_format)
	reltime = relativeTime(bot.config, datetime.now(), timestamp)

	msg = f"Last heard from \x0308{nick}\x03 at {timestamp} " \
		+ f"(\x0312{reltime} ago\x03) in \x0312{channel}"

	if last:
		msg += f'\x03 with "\x0308{message}\x03"'

	bot.say(msg)


def dump_seen_db(bot):
	"""
	Dumps the seen database into the bot's database.
	"""
	bot.memory["seen_lock"].acquire()
	for nick, seen in bot.memory["seen"].items():
		bot.db.execute("INSERT OR REPLACE INTO seen "
			"(nick, timestamp, channel, message) VALUES (?, ?, ?, ?)",
			(nick,) + seen)
	bot.memory["seen_lock"].release()


@hook(True)
@require_chanmsg
def seen_hook(bot, trigger):
	seen = (time.time(), trigger.channel, trigger.group(0))
	bot.memory["seen"][trigger.nick] = seen

	if time.time() - bot.memory["seen_last_dump"] > 60:
		# only dump once a minute at most
		dump_seen_db(bot)
		bot.memory["seen_last_dump"] = time.time()