<?php

if ( ! defined('BASEPATH')) exit('No direct script access allowed');

class Message_model extends DB_Model
{
	/**
	 * Constructor
	 */
	public function __construct()
	{
		parent::__construct();
		$this->dbTable = 'public.tbl_msg_message';
		$this->pk = 'message_id';
	}

	/**
	 * Get all sent messages from a person identified by person_id
	 */
	public function getMessagesByPerson($person_id, $oe_kurzbz, $all)
	{
		$sql = 'SELECT m.message_id,
						m.person_id,
						m.subject,
						m.body,
						m.priority,
						m.insertamum,
						m.relationmessage_id,
						m.oe_kurzbz,
						p.anrede,
						p.titelpost,
						p.titelpre,
						p.nachname,
						p.vorname,
						p.vornamen,
						s.status,
						s.statusinfo,
						s.insertamum AS statusamum
				  FROM public.tbl_msg_message m JOIN public.tbl_person p ON (p.person_id = m.person_id)
						LEFT JOIN (
							SELECT message_id, person_id, status, statusinfo, insertamum
							  FROM public.tbl_msg_status
							 %s
						  ORDER BY insertamum DESC
						) s ON (m.message_id = s.message_id AND m.person_id = s.person_id)
				 WHERE m.person_id = ?';

		$parametersArray = array($person_id);

		if ($all == 'true')
		{
			$sql = sprintf($sql, '');
		}
		else
		{
			$sql = sprintf($sql, 'WHERE status >= 3');
		}

		if ($oe_kurzbz != null)
		{
			array_push($parametersArray, $oe_kurzbz);
			$sql .= ' AND m.oe_kurzbz IN (
						WITH RECURSIVE organizations(_pk, _ppk) AS
							(
								SELECT o.oe_kurzbz, o.oe_parent_kurzbz
								  FROM public.tbl_organisationseinheit o
								 WHERE o.oe_kurzbz = ?
							 UNION ALL
								SELECT o.oe_kurzbz, o.oe_parent_kurzbz
								  FROM public.tbl_organisationseinheit o INNER JOIN organizations orgs ON (o.oe_parent_kurzbz = orgs._pk)
							)
							SELECT orgs._pk
							FROM organizations orgs
						)';
		}

		return $this->execQuery($sql, $parametersArray);
	}

	/**
	 * Gets massages with a person being sender OR receiver.
	 * @param $person_id
	 * @param null $status message status. by default, latest status is returned
	 * @return array|null
	 */
	public function getMessagesOfPerson($person_id, $status = null)
	{
		$sql = "SELECT m.message_id,
						m.person_id,
						m.subject,
						m.body,
						m.priority,
						m.insertamum,
						m.relationmessage_id,
						m.oe_kurzbz,
						se.person_id AS sepersonid,
						se.anrede AS seanrede,
						se.titelpost AS setitelpost,
						se.titelpre AS setitelpre,
						se.nachname AS senachname,
						se.vorname AS sevorname,
						se.vornamen AS sevornamen,
						re.person_id AS repersonid,
						re.anrede AS reanrede,
						re.titelpost AS retitelpost,
						re.titelpre AS retitelpre,
						re.nachname AS renachname,
						re.vorname AS revorname,
						re.vornamen AS revornamen,
						s.status,
						s.statusinfo,
						s.insertamum AS statusamum
				  FROM public.tbl_msg_message m
						JOIN public.tbl_msg_recipient r ON m.message_id = r.message_id
						JOIN public.tbl_person se ON (m.person_id = se.person_id)
						JOIN public.tbl_person re ON (r.person_id = re.person_id)
						LEFT JOIN (
							SELECT message_id, person_id, status, statusinfo, insertamum
							  FROM public.tbl_msg_status
							  %s
						  ORDER BY insertamum DESC
						  ) s ON (m.message_id = s.message_id AND re.person_id = s.person_id)
				 WHERE se.person_id = ?
				 OR re.person_id = ?
				 ";

		if (is_numeric($status))
		{
			$sql = sprintf($sql, 'WHERE status = '.$status);
		}
		else
		{
			$sql = sprintf($sql, '');
		}

		$parametersArray = array($person_id, $person_id);

		return $this->execQuery($sql, $parametersArray);
	}

	/**
	 * getMessageVars
	 */
	public function getMessageVars()
	{
		$result = $this->db->query('SELECT * FROM public.vw_msg_vars WHERE 0 = 1');

		if ($result)
		{
			return success($result->list_fields());
		}
		else
		{
			return error($this->db->error(), FHC_DB_ERROR);
		}
	}

	/**
	 * getMessageVars for person
	 */
	public function getMessageVarsPerson()
	{
		$result = $this->db->query('SELECT * FROM public.vw_msg_vars_person WHERE 0 = 1');

		if ($result)
		{
			return success($result->list_fields());
		}
		else
		{
			return error($this->db->error(), FHC_DB_ERROR);
		}
	}
	
	/**
	 * Get message variables for logged in user
	 */
	public function getMsgVarsLoggedInUser()
	{
		$result = $this->db->query('SELECT * FROM public.vw_msg_vars_user WHERE 0 = 1');
		
		if ($result)
		{
			return success($result->list_fields());
		}
		else
		{
			return error($this->db->error(), FHC_DB_ERROR);
		}
	}

	/**
	 * getMsgVarsDataByPrestudentId
	 */
	public function getMsgVarsDataByPrestudentId($prestudent_id)
	{
		$query = 'SELECT * FROM public.vw_msg_vars WHERE prestudent_id %s ?';

		return $this->execQuery(sprintf($query, is_array($prestudent_id) ? 'IN' : '='), array($prestudent_id));
	}

	/**
	 * getMsgVarsDataByPersonId
	 */
	public function getMsgVarsDataByPersonId($person_id)
	{
		$query = 'SELECT * FROM public.vw_msg_vars_person WHERE person_id %s ?';

		return $this->execQuery(sprintf($query, is_array($person_id) ? 'IN' : '='), array($person_id));
	}
	
	/**
	 * Get message vars data for logged in user
	 * @param string uid The UID should ONLY be passed if this method is called by a cronjob.
	 * This is to enable jobs to use templates which use logged-in-user fields ('Eigene Felder').
	 * @return array|null
	 */
	public function getMsgVarsDataByLoggedInUser($uid = null)
	{
		if (is_string($uid))
		{
			$params = array($uid);
		}
		else
		{
			$params = array(getAuthUID());
		}
		
		$query = 'SELECT * FROM public.vw_msg_vars_user WHERE my_uid = ?';
		
		return $this->execQuery($query, $params);
	}

	/**
	 * Gets messages for a person for tableMessages.
	 * @param $person_id
	 * paginationInitialPage: 1,
	 * @param $offset number to skip, calculated by tabulatorParam paginationInitialPage and 	paginationSize, refers to specified numer of skipped items
	 * and page
	 * @param $limit refers to tabulatorParam paginationSize
	 * @return array|null
	 */
	public function getMessagesForTable($person_id, $offset, $limit)
	{
		$sql = <<<EOSQL
			with filtered_messages as (
				select
					m.message_id, m.person_id as sender_id, mr.person_id as recipient_id
				from
					public.tbl_msg_message m
				join
					public.tbl_msg_recipient mr on mr.message_id = m.message_id
				where
					m.person_id = ?
				group by
					m.message_id, m.person_id, mr.person_id

				union all

				select
					m.message_id, m.person_id as sender_id, mr.person_id as recipient_id
				from
					public.tbl_msg_message m
				join
					public.tbl_msg_recipient mr on mr.message_id = m.message_id
				where
					mr.person_id = ?
				group by
					m.message_id, m.person_id, mr.person_id

			), lastmsgstatus as (
				select
					ms.*
				from (
						select
							s.message_id, s.person_id, MAX(s.insertamum) as lastinserted
						from
							public.tbl_msg_status s
						join
							filtered_messages fm on fm.message_id = s.message_id and fm.recipient_id = s.person_id
						group by
							s.message_id, s.person_id
					) ls
				join
					public.tbl_msg_status ms on ms.message_id = ls.message_id and ms.person_id = ls.person_id and ms.insertamum = ls.lastinserted
			)

			select
				(select count(*) from filtered_messages) as total_msgs,
				m.message_id AS message_id,
				m.subject AS subject,
				m.body AS body,
				m.insertamum AS insertamum,
				m.relationmessage_id AS relationmessage_id,
				(COALESCE(ps.titelpre,'') || ' ' || COALESCE(ps.vorname,'') || ' ' || COALESCE(ps.nachname,'') || ' ' || COALESCE(ps.titelpost,'')) as sender,
				(COALESCE(pr.titelpre,'') || ' ' || COALESCE(pr.vorname,'') || ' ' || COALESCE(pr.nachname,'') || ' ' || COALESCE(pr.titelpost,'')) as recipient,
				fm.sender_id,
				fm.recipient_id,
				ms.status,
				ms.insertamum as statusdatum
			from
				filtered_messages fm
			join
				public.tbl_msg_message m on fm.message_id = m.message_id
			join
				lastmsgstatus ms on fm.message_id = ms.message_id and fm.recipient_id = ms.person_id
			left join
				public.tbl_person ps on ps.person_id = fm.sender_id
			left join
				public.tbl_person pr on pr.person_id = fm.recipient_id
			order by
				m.insertamum DESC
			limit ?
			offset ?;
EOSQL;

		$parametersArray = array($person_id, $person_id, $limit, $offset);

		$count = 0;
		$data = $this->execQuery($sql, $parametersArray);

		if (isError($data))
			return $data;

		$data = getData($data);
		if($data)
		{
			$count = ceil($data[0]->total_msgs / $limit);
		}

		return success(['data' => $data, 'count' => $count]);
	}

	/**
	 * Deletes entry in dependency table tbl_msg_recipient
	 *
	 * @param $message_id
	 * @return boolean success
	 */
	public function deleteMessageRecipient($message_id)
	{
		$sql = "
		 DELETE FROM public.tbl_msg_recipient
			WHERE message_id = ?;
		 ";

		return $this->execQuery($sql, array($message_id));
	}

	/**
	 * Deletes entry in dependency table tbl_msg_status
	 *
	 * @param $message_id
	 * @return boolean success
	 */
	public function deleteMessageStatus($message_id)
	{
		$sql = "
		 DELETE FROM public.tbl_msg_status
			WHERE message_id = ?;
		 ";

		return $this->execQuery($sql, array($message_id));
	}
	/**
	 * Deletes entry in dependency table tbl_msg_message
	 *
	 * @param $message_id
	 * @return boolean success
	 */
	public function deleteMessage($message_id)
	{
		$sql = "
		 DELETE FROM public.tbl_msg_message
			WHERE message_id = ?;
		 ";

		return $this->execQuery($sql, array($message_id));
	}
	
}