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

/**
 * Customer class
 *
 * @link    github.com/jekkos/opensourcepos
 * @since   1.0
 * @author  N/A
 */

class Customer extends Person
{   
    /*
    Determines if a given person_id is a customer
    */
    public function exists($person_id)
    {
        $this->db->from('customers');   
        $this->db->join('people', 'people.person_id = customers.person_id');
        $this->db->where('customers.person_id', $person_id);
        
        return ($this->db->get()->num_rows() == 1);
    }

    /*
    Checks if account number exists
    */
    public function check_account_number_exists($account_number, $person_id = '')
    {
        $this->db->from('customers');
        $this->db->where('account_number', $account_number);

        if(!empty($person_id))
        {
            $this->db->where('person_id !=', $person_id);
        }

        return ($this->db->get()->num_rows() == 1);
    }   

    /*
    Gets total of rows
    */
    public function get_total_rows()
    {
        $this->db->from('customers');
        $this->db->where('deleted', 0);

        return $this->db->count_all_results();
    }
    
    /*
    Returns all the customers
    */
    public function get_all($rows = 0, $limit_from = 0)
    {
        $this->db->from('customers');
        $this->db->join('people', 'customers.person_id = people.person_id');            
        $this->db->where('deleted', 0);
        $this->db->order_by('last_name', 'asc');

        if($rows > 0)
        {
            $this->db->limit($rows, $limit_from);
        }

        return $this->db->get();        
    }
    
    /*
    Gets information about a particular customer
    */
    public function get_info($customer_id)
    {
        $this->db->from('customers');
        $this->db->join('people', 'people.person_id = customers.person_id');
        $this->db->where('customers.person_id', $customer_id);
        $query = $this->db->get();
        
        if($query->num_rows() == 1)
        {
            return $query->row();
        }
        else
        {
            //Get empty base parent object, as $customer_id is NOT a customer
            $person_obj = parent::get_info(-1);
            
            //Get all the fields from customer table
            //append those fields to base parent object, we we have a complete empty object
            foreach($this->db->list_fields('customers') as $field)
            {
                $person_obj->$field = '';
            }
            
            return $person_obj;
        }
    }
    
    /*
    Gets stats about a particular customer
    */
    public function get_stats($customer_id)
    {
        // create a temporary table to contain all the sum and average of items
        $this->db->query('CREATE TEMPORARY TABLE IF NOT EXISTS ' . $this->db->dbprefix('sales_items_temp') . 
            ' (INDEX(sale_id))
            (
                SELECT
                    sales.sale_id AS sale_id,
                    AVG(sales_items.discount_percent) AS avg_discount,
                    SUM(sales_items.quantity_purchased) AS quantity
                FROM ' . $this->db->dbprefix('sales') . ' AS sales
                INNER JOIN ' . $this->db->dbprefix('sales_items') . ' AS sales_items
                    ON sales_items.sale_id = sales.sale_id
                WHERE sales.customer_id = ' . $this->db->escape($customer_id) . '
                GROUP BY sale_id
            )'
        );

        $totals_decimals = totals_decimals();
        $quantity_decimals = quantity_decimals();

        $this->db->select('
                        SUM(sales_payments.payment_amount) AS total,
                        MIN(sales_payments.payment_amount) AS min,
                        MAX(sales_payments.payment_amount) AS max,
                        AVG(sales_payments.payment_amount) AS average,
                        ' . "
                        ROUND(AVG(sales_items_temp.avg_discount), $totals_decimals) AS avg_discount,
                        ROUND(SUM(sales_items_temp.quantity), $quantity_decimals) AS quantity
                        ");
        $this->db->from('sales');
        $this->db->join('sales_payments AS sales_payments', 'sales.sale_id = sales_payments.sale_id');
        $this->db->join('sales_items_temp AS sales_items_temp', 'sales.sale_id = sales_items_temp.sale_id');
        $this->db->where('sales.customer_id', $customer_id);
        $this->db->where('sales.sale_status', 0);
        $this->db->group_by('sales.customer_id');

        $stat = $this->db->get()->row();

        // drop the temporary table to contain memory consumption as it's no longer required
        $this->db->query('DROP TEMPORARY TABLE IF EXISTS ' . $this->db->dbprefix('sales_items_temp'));

        return $stat;
    }
    
    /*
    Gets information about multiple customers
    */
    public function get_multiple_info($customer_ids)
    {
        $this->db->from('customers');
        $this->db->join('people', 'people.person_id = customers.person_id');        
        $this->db->where_in('customers.person_id', $customer_ids);
        $this->db->order_by('last_name', 'asc');

        return $this->db->get();
    }

    /*
    Checks if customer email exists
    */
    public function check_email_exists($email, $customer_id = '')
    {
        // if the email is empty return like it is not existing
        if(empty($email))
        {
            return FALSE;
        }

        $this->db->from('customers');
        $this->db->join('people', 'people.person_id = customers.person_id');
        $this->db->where('people.email', $email);
        $this->db->where('customers.deleted', 0);

        if(!empty($customer_id))
        {
            $this->db->where('customers.person_id !=', $customer_id);
        }

        return ($this->db->get()->num_rows() == 1);
    }

    /*
    Inserts or updates a customer
    */
    public function save_customer(&$person_data, &$customer_data, $customer_id = FALSE)
    {
        $success = FALSE;

        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        if(parent::save($person_data, $customer_id))
        {
            if(!$customer_id || !$this->exists($customer_id))
            {
                $customer_data['person_id'] = $person_data['person_id'];
                $success = $this->db->insert('customers', $customer_data);
            }
            else
            {
                $this->db->where('person_id', $customer_id);
                $success = $this->db->update('customers', $customer_data);
            }
        }
        
        $this->db->trans_complete();

        $success &= $this->db->trans_status();

        return $success;
    }
    
    /*
    Updates reward points value
    */
    public function update_reward_points_value($customer_id, $value)
    {
        $this->db->where('person_id', $customer_id);
        $this->db->update('customers', array('points' => $value));
    } 


    /*
    Deletes one customer
    */
    public function delete($customer_id)
    {
        $this->db->where('person_id', $customer_id);

        return $this->db->update('customers', array('deleted' => 1));
    }
    
    /*
    Deletes a list of customers
    */
    public function delete_list($customer_ids)
    {
        $this->db->where_in('person_id', $customer_ids);

        return $this->db->update('customers', array('deleted' => 1));
    }
    
    /*
    Get search suggestions to find customers
    */
    public function get_search_suggestions($search, $unique = TRUE, $limit = 25)
    {
        $suggestions = array();
        
        $this->db->from('customers');
        $this->db->join('people', 'customers.person_id = people.person_id');
        $this->db->group_start();       
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search); 
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);
        $this->db->order_by('last_name', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->person_id, 'label' => $row->first_name.' '.$row->last_name);
        }

        if(!$unique)
        {
            $this->db->from('customers');
            $this->db->join('people', 'customers.person_id = people.person_id');
            $this->db->where('deleted', 0);
            $this->db->like('email', $search);
            $this->db->order_by('email', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('value' => $row->person_id, 'label' => $row->email);
            }

            $this->db->from('customers');
            $this->db->join('people', 'customers.person_id = people.person_id');
            $this->db->where('deleted', 0);
            $this->db->like('phone_number', $search);
            $this->db->order_by('phone_number', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('value' => $row->person_id, 'label' => $row->phone_number);
            }

            $this->db->from('customers');
            $this->db->join('people', 'customers.person_id = people.person_id');
            $this->db->where('deleted', 0);
            $this->db->like('account_number', $search);
            $this->db->order_by('account_number', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('value' => $row->person_id, 'label' => $row->account_number);
            }
        }
        
        //only return $limit suggestions
        if(count($suggestions > $limit))
        {
            $suggestions = array_slice($suggestions, 0, $limit);
        }

        return $suggestions;
    }

    /*
    Gets rows
    */
    public function get_found_rows($search)
    {
        $this->db->from('customers');
        $this->db->join('people', 'customers.person_id = people.person_id');
        $this->db->group_start();
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search);
            $this->db->or_like('email', $search);
            $this->db->or_like('phone_number', $search);
            $this->db->or_like('account_number', $search);
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);

        return $this->db->get()->num_rows();
    }
    
    /*
    Performs a search on customers
    */
    public function search($search, $rows = 0, $limit_from = 0, $sort = 'last_name', $order = 'asc')
    {
        $this->db->from('customers');
        $this->db->join('people', 'customers.person_id = people.person_id');
        $this->db->group_start();
            $this->db->like('first_name', $search);
            $this->db->or_like('last_name', $search);
            $this->db->or_like('email', $search);
            $this->db->or_like('phone_number', $search);
            $this->db->or_like('account_number', $search);
            $this->db->or_like('CONCAT(first_name, " ", last_name)', $search);
        $this->db->group_end();
        $this->db->where('deleted', 0);
        $this->db->order_by($sort, $order);

        if($rows > 0)
        {
            $this->db->limit($rows, $limit_from);
        }

        return $this->db->get();    
    }
}
?>