<?php

class Statistics {

	static public function get_stat_24h($boardName = false, $realtime = true, $boards = false) {
		global $config, $pdo;

		$query = "";
		if(!$boardName) {
			// Get list of all boards
			if($boards === false)
				$boards = listBoards();

			// Get post count by hour for the last day
			$query = "SELECT SUM(count) AS count, hour FROM (";
			foreach ($boards as $board) {
				if($realtime)
					$query .= sprintf("SELECT COUNT(*) AS count, HOUR(FROM_UNIXTIME(time)) AS hour FROM posts_%s WHERE DATE(FROM_UNIXTIME(time)) = CURDATE() GROUP BY hour UNION ALL ", $board['uri']);
				else
					$query .= sprintf("SELECT COUNT(*) AS count, HOUR(FROM_UNIXTIME(time)) AS hour FROM posts_%s WHERE DATE(FROM_UNIXTIME(time)) = DATE(NOW() - INTERVAL 1 HOUR) AND HOUR(FROM_UNIXTIME(time)) <= HOUR(NOW() - INTERVAL 1 HOUR) GROUP BY hour UNION ALL ", $board['uri']);
			}
			// Remove the last "UNION ALL" seperator and complete the query
			$query = preg_replace('/UNION ALL $/', ') AS deriv_all GROUP BY hour ORDER BY hour ASC', $query);
		} else {
			if($realtime)
				$query = sprintf("SELECT COUNT(*) AS count, HOUR(FROM_UNIXTIME(time)) AS hour FROM posts_%s WHERE DATE(FROM_UNIXTIME(time)) = CURDATE() GROUP BY hour", $boardName);
			else
				$query = sprintf("SELECT COUNT(*) AS count, HOUR(FROM_UNIXTIME(time)) AS hour FROM posts_%s WHERE DATE(FROM_UNIXTIME(time)) = DATE(NOW() - INTERVAL 1 HOUR) AND HOUR(FROM_UNIXTIME(time)) <= HOUR(NOW() - INTERVAL 1 HOUR) GROUP BY hour", $boardName);
		}
		$query = query($query) or error(db_error($query));
		$query_result = $query->fetchAll(PDO::FETCH_ASSOC);

		// Get 24h array over post count
		$statistics_hour = array_fill(0,24,0);
		foreach ($query_result as &$hour_data) {
			$statistics_hour[$hour_data['hour']] = $hour_data['count'];
		}

		// Set last variables to 'null' for JavaScript
		$last_hour = end($query_result)['hour'];
		if($last_hour != 23)
			for($i=$last_hour+1; $i<24; $i++)
				$statistics_hour[$i] = 'null';

		// Make string for JS
		$statistics_hour = implode(",", $statistics_hour);

		return $statistics_hour;
	}

	static public function get_stat_week($previous_week = false, $boardName = false, $realtime = true, $hour_realtime = true, $boards = false) {
		global $config, $pdo;

		$query = "";
		if(!$boardName) {
			// Get list of all boards
			if($boards === false)
				$boards = listBoards();

			// Get post count by hour for the last week
			$query = "SELECT SUM(count) AS count, day FROM (";
			foreach ($boards as $board) {
				if($previous_week) {
					if($realtime)
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW(), INTERVAL 1 WEEK), 1) GROUP BY day UNION ALL ", $board['uri']);
					else if($hour_realtime)
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW() - INTERVAL 1 HOUR, INTERVAL 1 WEEK), 1) GROUP BY day UNION ALL ", $board['uri']);
					else
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW() - INTERVAL 1 DAY, INTERVAL 1 WEEK), 1) GROUP BY day UNION ALL ", $board['uri']);
				} else {
					if($realtime)
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW(), 1) GROUP BY day UNION ALL ", $board['uri']);
					else if($hour_realtime)
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW() - INTERVAL 1 HOUR, 1)  AND ( (DATE(FROM_UNIXTIME(time)) = DATE(NOW() - INTERVAL 1 HOUR) AND HOUR(FROM_UNIXTIME(time)) <= HOUR(NOW() - INTERVAL 1 HOUR)) OR (DATE(FROM_UNIXTIME(time)) < DATE(NOW() - INTERVAL 1 HOUR)) ) GROUP BY day UNION ALL ", $board['uri']);
					else
						$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW() - INTERVAL 1 DAY, 1) AND WEEKDAY(FROM_UNIXTIME(time)) <= WEEKDAY(NOW() - INTERVAL 1 DAY) GROUP BY day UNION ALL ", $board['uri']);
				}
			}
			// Remove the last "UNION ALL" seperator and complete the query
			$query = preg_replace('/UNION ALL $/', ') AS deriv_all GROUP BY day ORDER BY day ASC', $query);
		} else {
			if($previous_week) {
				if($realtime)
					$query = sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW(), INTERVAL 1 WEEK), 1) GROUP BY day", $boardName);
				else if($hour_realtime)
					$query = sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW() - INTERVAL 1 HOUR, INTERVAL 1 WEEK), 1) GROUP BY day", $boardName);
				else
					$query = sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(DATE_SUB(NOW() - INTERVAL 1 DAY, INTERVAL 1 WEEK), 1) GROUP BY day", $boardName);
			} else {
				if($realtime)
					$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW(), 1) GROUP BY day", $boardName);
				else if($hour_realtime)
					$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW() - INTERVAL 1 HOUR, 1)  AND ( (DATE(FROM_UNIXTIME(time)) = DATE(NOW() - INTERVAL 1 HOUR) AND HOUR(FROM_UNIXTIME(time)) <= HOUR(NOW() - INTERVAL 1 HOUR)) OR (DATE(FROM_UNIXTIME(time)) < DATE(NOW() - INTERVAL 1 HOUR)) ) GROUP BY day", $boardName);
				else
					$query .= sprintf("SELECT COUNT(*) AS count, WEEKDAY(FROM_UNIXTIME(time)) AS day FROM posts_%s WHERE YEARWEEK(FROM_UNIXTIME(time), 1) = YEARWEEK(NOW() - INTERVAL 1 DAY, 1) AND WEEKDAY(FROM_UNIXTIME(time)) <= WEEKDAY(NOW() - INTERVAL 1 DAY) GROUP BY day", $boardName);
			}
		}
		$query = query($query) or error(db_error($query));
		$query_result = $query->fetchAll(PDO::FETCH_ASSOC);

		// Get week array over post count
		$statistics_week = array_fill(0,7,0);
		foreach ($query_result as &$day_data) {
			$statistics_week[$day_data['day']] = $day_data['count'];
		}

		return $statistics_week;
	}

	static public function get_stat_week_labels($week_data) {
		return 	sprintf("'Monday\\n(%d)', 'Tuesday\\n(%d)', 'Wednesday\\n(%d)', 'Thursday\\n(%d)', 'Friday\\n(%d)', 'Saturday\\n(%d)', 'Sunday\\n(%d)'", $week_data[0], $week_data[1], $week_data[2], $week_data[3], $week_data[4], $week_data[5], $week_data[6]);
	}
	static public function get_stat_week_jsdata($week_data) {
		// Make string for JS
		return implode(",", $week_data);
	}

	static public function getPostStatistics($boards) {
		global $config;

		if (!isset($config['boards'])) {
			return null;
		}

		$HOUR = 3600;
		$DAY = $HOUR * 24;
		$WEEK = $DAY * 7;

		$stats = [];
		$hourly = [];
		$daily = [];
		$weekly = [];

		foreach ($boards as $board) {
			if (!array_key_exists('uri', $board)) {
				// board doesn't exist. 
				continue;
			}
			$_board = getBoardInfo($board['uri']);
			if (!$_board) {
				// board doesn't exist. 
				continue;
			}

			$boardStat['title'] = $_board['title'];

			$boardStat['hourly_ips'] = Statistics::countUniqueIps($hourly, $HOUR, $_board);
			$boardStat['daily_ips'] = Statistics::countUniqueIps($daily, $DAY, $_board);
			$boardStat['weekly_ips'] = Statistics::countUniqueIps($weekly, $WEEK, $_board);

			$pph_query = query(
				sprintf("SELECT COUNT(*) AS count FROM ``posts_%s`` WHERE time > %d",
						$_board['uri'],
						time()-3600)
			) or error(db_error());

			$boardStat['pph'] = $pph_query->fetch()['count'];

			$stats['boards'][] = $boardStat;
		}

		$stats['hourly_ips'] = count($hourly);
		$stats['daily_ips'] = count($daily);
		$stats['weekly_ips'] = count($weekly);
		$stats['pph'] = array_sum(array_column($stats['boards'], 'pph'));

		return $stats;
	}

	static private function countUniqueIps(&$markAsCounted, $timespan, $_board) {
		$unique_query = query(
			sprintf("SELECT DISTINCT ip FROM ``posts_%s`` WHERE time > %d",
						$_board['uri'],
						time()-$timespan)
			) or error(db_error());
		$uniqueIps = $unique_query->fetchAll();
		foreach ($uniqueIps as $_k => $row) {
			$markAsCounted[$row['ip']] = true;
		}

		return count($uniqueIps);
	}
}

?>