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<?php
class Item extends CI_Model
{
    /*
    Determines if a given item_id is an item
    */
    public function exists($item_id, $ignore_deleted = FALSE, $deleted = FALSE)
    {
        if (ctype_digit($item_id))
        {
            $this->db->from('items');
            $this->db->where('item_id', (int) $item_id);
            if ($ignore_deleted == FALSE)
            {
                $this->db->where('deleted', $deleted);
            }

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

        return FALSE;
    }

    /*
    Determines if a given item_number exists
    */
    public function item_number_exists($item_number, $item_id = '')
    {
        $this->db->from('items');
        $this->db->where('item_number', (string) $item_number);
        if(ctype_digit($item_id))
        {
            $this->db->where('item_id !=', (int) $item_id);
        }

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

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

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

    /*
    Get number of rows
    */
    public function get_found_rows($search, $filters)
    {
        return $this->search($search, $filters)->num_rows();
    }

    /*
    Perform a search on items
    */
    public function search($search, $filters, $rows = 0, $limit_from = 0, $sort = 'items.name', $order = 'asc')
    {
        $this->db->select('MAX(items.name) as name');
        $this->db->select('MAX(items.category) as category');
        $this->db->select('MAX(items.supplier_id) as supplier_id');
        $this->db->select('MAX(items.item_number) as item_number');
        $this->db->select('MAX(items.description) as description');
        $this->db->select('MAX(items.cost_price) as cost_price');
        $this->db->select('MAX(items.unit_price) as unit_price');
        $this->db->select('MAX(items.reorder_level) as reorder_level');
        $this->db->select('MAX(items.receiving_quantity) as receiving_quantity');
        $this->db->select('items.item_id as item_id');
        $this->db->select('MAX(items.pic_filename) as pic_filename');
        $this->db->select('MAX(items.allow_alt_description) as allow_alt_description');
        $this->db->select('MAX(items.is_serialized) as is_serialized');
        $this->db->select('MAX(items.deleted) as deleted');
        $this->db->select('MAX(items.custom1) as custom1');
        $this->db->select('MAX(items.custom2) as custom2');
        $this->db->select('MAX(items.custom3) as custom3');
        $this->db->select('MAX(items.custom4) as custom4');
        $this->db->select('MAX(items.custom5) as custom5');
        $this->db->select('MAX(items.custom6) as custom6');
        $this->db->select('MAX(items.custom7) as custom7');
        $this->db->select('MAX(items.custom8) as custom8');
        $this->db->select('MAX(items.custom9) as custom9');
        $this->db->select('MAX(items.custom10) as custom10');

        $this->db->select('MAX(suppliers.person_id) as person_id');
        $this->db->select('MAX(suppliers.company_name) as company_name');
        $this->db->select('MAX(suppliers.agency_name) as agency_name');
        $this->db->select('MAX(suppliers.account_number) as account_number');
        $this->db->select('MAX(suppliers.deleted) as deleted');

        $this->db->select('MAX(inventory.trans_id) as trans_id');
        $this->db->select('MAX(inventory.trans_items) as trans_items');
        $this->db->select('MAX(inventory.trans_user) as trans_user');
        $this->db->select('MAX(inventory.trans_date) as trans_date');
        $this->db->select('MAX(inventory.trans_comment) as trans_comment');
        $this->db->select('MAX(inventory.trans_location) as trans_location');
        $this->db->select('MAX(inventory.trans_inventory) as trans_inventory');

        if($filters['stock_location_id'] > -1)
        {
            $this->db->select('MAX(item_quantities.item_id) as qty_item_id');
            $this->db->select('MAX(item_quantities.location_id) as location_id');
            $this->db->select('MAX(item_quantities.quantity) as quantity');
        }

        $this->db->from('items as items');
        $this->db->join('suppliers as suppliers', 'suppliers.person_id = items.supplier_id', 'left');
        $this->db->join('inventory as inventory', 'inventory.trans_items = items.item_id');

        if($filters['stock_location_id'] > -1)
        {
            $this->db->join('item_quantities as item_quantities', 'item_quantities.item_id = items.item_id');
            $this->db->where('location_id', $filters['stock_location_id']);
        }

        if(empty($this->config->item('date_or_time_format')))
        {
            $this->db->where('DATE_FORMAT(trans_date, "%Y-%m-%d") BETWEEN ' . $this->db->escape($filters['start_date']) . ' AND ' . $this->db->escape($filters['end_date']));
        }
        else
        {
            $this->db->where('trans_date BETWEEN ' . $this->db->escape(rawurldecode($filters['start_date'])) . ' AND ' . $this->db->escape(rawurldecode($filters['end_date'])));
        }

        if(!empty($search))
        {
            if($filters['search_custom'] == FALSE)
            {
                $this->db->group_start();
                    $this->db->like('name', $search);
                    $this->db->or_like('item_number', $search);
                    $this->db->or_like('items.item_id', $search);
                    $this->db->or_like('company_name', $search);
                    $this->db->or_like('category', $search);
                $this->db->group_end();
            }
            else
            {
                $this->db->group_start();
                    $this->db->like('custom1', $search);
                    $this->db->or_like('custom2', $search);
                    $this->db->or_like('custom3', $search);
                    $this->db->or_like('custom4', $search);
                    $this->db->or_like('custom5', $search);
                    $this->db->or_like('custom6', $search);
                    $this->db->or_like('custom7', $search);
                    $this->db->or_like('custom8', $search);
                    $this->db->or_like('custom9', $search);
                    $this->db->or_like('custom10', $search);
                $this->db->group_end();
            }
        }

        $this->db->where('items.deleted', $filters['is_deleted']);

        if($filters['empty_upc'] != FALSE)
        {
            $this->db->where('item_number', NULL);
        }
        if($filters['low_inventory'] != FALSE)
        {
            $this->db->where('quantity <=', 'reorder_level');
        }
        if($filters['is_serialized'] != FALSE)
        {
            $this->db->where('is_serialized', 1);
        }
        if($filters['no_description'] != FALSE)
        {
            $this->db->where('items.description', '');
        }

        // avoid duplicated entries with same name because of inventory reporting multiple changes on the same item in the same date range
        $this->db->group_by('items.item_id');

        // order by name of item
        $this->db->order_by($sort, $order);

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

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

    /*
    Returns all the items
    */
    public function get_all($stock_location_id = -1, $rows = 0, $limit_from = 0)
    {
        $this->db->from('items');
        $this->db->join('suppliers', 'suppliers.person_id = items.supplier_id', 'left');

        if($stock_location_id > -1)
        {
            $this->db->join('item_quantities', 'item_quantities.item_id = items.item_id');
            $this->db->where('location_id', $stock_location_id);
        }

        $this->db->where('items.deleted', 0);

        // order by name of item
        $this->db->order_by('items.name', 'asc');

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

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

    /*
    Gets information about a particular item
    */
    public function get_info($item_id)
    {
        $this->db->select('items.*');
        $this->db->select('suppliers.company_name');
        $this->db->from('items');
        $this->db->join('suppliers', 'suppliers.person_id = items.supplier_id', 'left');
        $this->db->where('item_id', $item_id);

        $query = $this->db->get();

        if($query->num_rows() == 1)
        {
            return $query->row();
        }
        else
        {
            //Get empty base parent object, as $item_id is NOT an item
            $item_obj = new stdClass();

            //Get all the fields from items table
            foreach($this->db->list_fields('items') as $field)
            {
                $item_obj->$field = '';
            }

            return $item_obj;
        }
    }

    /*
    Gets information about a particular item by item id or number
    */
    public function get_info_by_id_or_number($item_id)
    {
        $this->db->from('items');

        if (ctype_digit($item_id))
        {
            $this->db->group_start();
                $this->db->where('item_id', (int) $item_id);
                $this->db->or_where('items.item_number', $item_id);
            $this->db->group_end();
        }
        else
        {
            $this->db->where('item_number', $item_id);
        }

        $this->db->where('items.deleted', 0);

        $query = $this->db->get();

        if($query->num_rows() == 1)
        {
            return $query->row();
        }

        return '';
    }

    /*
    Get an item id given an item number
    */
    public function get_item_id($item_number, $ignore_deleted = FALSE, $deleted = FALSE)
    {
        $this->db->from('items');
        $this->db->join('suppliers', 'suppliers.person_id = items.supplier_id', 'left');
        $this->db->where('item_number', $item_number);
        if($ignore_deleted == FALSE)
        {
            $this->db->where('items.deleted', $deleted);
        }

        $query = $this->db->get();

        if($query->num_rows() == 1)
        {
            return $query->row()->item_id;
        }

        return FALSE;
    }

    /*
    Gets information about multiple items
    */
    public function get_multiple_info($item_ids, $location_id)
    {
        $this->db->from('items');
        $this->db->join('suppliers', 'suppliers.person_id = items.supplier_id', 'left');
        $this->db->join('item_quantities', 'item_quantities.item_id = items.item_id', 'left');
        $this->db->where('location_id', $location_id);
        $this->db->where_in('items.item_id', $item_ids);

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

    /*
    Inserts or updates a item
    */
    public function save(&$item_data, $item_id = FALSE)
    {
        if(!$item_id || !$this->exists($item_id, TRUE))
        {
            if($this->db->insert('items', $item_data))
            {
                $item_data['item_id'] = $this->db->insert_id();

                return TRUE;
            }

            return FALSE;
        }

        $this->db->where('item_id', $item_id);

        return $this->db->update('items', $item_data);
    }

    /*
    Updates multiple items at once
    */
    public function update_multiple($item_data, $item_ids)
    {
        $this->db->where_in('item_id', explode(':', $item_ids));

        return $this->db->update('items', $item_data);
    }

    /*
    Deletes one item
    */
    public function delete($item_id)
    {
        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        // set to 0 quantities
        $this->Item_quantity->reset_quantity($item_id);
        $this->db->where('item_id', $item_id);
        $success = $this->db->update('items', array('deleted'=>1));

        $this->db->trans_complete();

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

        return $success;
    }

    /*
    Undeletes one item
    */
    public function undelete($item_id)
    {
        $this->db->where('item_id', $item_id);

        return $this->db->update('items', array('deleted'=>0));
    }

    /*
    Deletes a list of items
    */
    public function delete_list($item_ids)
    {
        //Run these queries as a transaction, we want to make sure we do all or nothing
        $this->db->trans_start();

        // set to 0 quantities
        $this->Item_quantity->reset_quantity_list($item_ids);
        $this->db->where_in('item_id', $item_ids);
        $success = $this->db->update('items', array('deleted'=>1));

        $this->db->trans_complete();

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

        return $success;
    }

    public function get_search_suggestions($search, $filters = array('is_deleted' => FALSE, 'search_custom' => FALSE), $unique = FALSE, $limit = 25)
    {
        $suggestions = array();

        $this->db->select('item_id, name');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
        $this->db->like('name', $search);
        $this->db->order_by('name', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
        }

        $this->db->select('item_id, item_number');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
        $this->db->like('item_number', $search);
        $this->db->order_by('item_number', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->item_number);
        }

        if(!$unique)
        {
            //Search by category
            $this->db->select('category');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
            $this->db->distinct();
            $this->db->like('category', $search);
            $this->db->order_by('category', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->category);
            }

            //Search by supplier
            $this->db->select('company_name');
            $this->db->from('suppliers');
            $this->db->like('company_name', $search);
            // restrict to non deleted companies only if is_deleted is FALSE
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
            $this->db->distinct();
            $this->db->order_by('company_name', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->company_name);
            }

            //Search by description
            $this->db->select('item_id, name, description');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
            $this->db->like('description', $search);
            $this->db->order_by('description', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $entry = array('value' => $row->item_id, 'label' => $row->name);
                if(!array_walk($suggestions, function($value, $label) use ($entry) { return $entry['label'] != $label; } ))
                {
                    $suggestions[] = $entry;
                }
            }

            //Search by custom fields
            if($filters['search_custom'] != FALSE)
            {
                $this->db->from('items');
                $this->db->group_start();
                    $this->db->like('custom1', $search);
                    $this->db->or_like('custom2', $search);
                    $this->db->or_like('custom3', $search);
                    $this->db->or_like('custom4', $search);
                    $this->db->or_like('custom5', $search);
                    $this->db->or_like('custom6', $search);
                    $this->db->or_like('custom7', $search);
                    $this->db->or_like('custom8', $search);
                    $this->db->or_like('custom9', $search);
                    $this->db->or_like('custom10', $search);
                $this->db->group_end();
                $this->db->where('deleted', $filters['is_deleted']);
                $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
                foreach($this->db->get()->result() as $row)
                {
                    $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
                }
            }
        }


        //only return $limit suggestions
        if(count($suggestions > $limit))
        {
            $suggestions = array_slice($suggestions, 0,$limit);
        }

        return $suggestions;
    }


    public function get_stock_search_suggestions($search, $filters = array('is_deleted' => FALSE, 'search_custom' => FALSE), $unique = FALSE, $limit = 25)
    {
        $suggestions = array();

        $this->db->select('item_id, name');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
        $this->db->where("stock_type = '0'"); // stocked items only
        $this->db->like('name', $search);
        $this->db->order_by('name', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
        }

        $this->db->select('item_id, item_number');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
        $this->db->where("stock_type = '0'"); // stocked items only
        $this->db->like('item_number', $search);
        $this->db->order_by('item_number', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->item_number);
        }

        if(!$unique)
        {
            //Search by category
            $this->db->select('category');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
            $this->db->where("stock_type = '0'"); // stocked items only
            $this->db->distinct();
            $this->db->like('category', $search);
            $this->db->order_by('category', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->category);
            }

            //Search by supplier
            $this->db->select('company_name');
            $this->db->from('suppliers');
            $this->db->like('company_name', $search);
            // restrict to non deleted companies only if is_deleted is FALSE
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->distinct();
            $this->db->order_by('company_name', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->company_name);
            }

            //Search by description
            $this->db->select('item_id, name, description');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
            $this->db->where("stock_type = '0'"); // stocked items only
            $this->db->like('description', $search);
            $this->db->order_by('description', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $entry = array('value' => $row->item_id, 'label' => $row->name);
                if(!array_walk($suggestions, function($value, $label) use ($entry) { return $entry['label'] != $label; } ))
                {
                    $suggestions[] = $entry;
                }
            }

            //Search by custom fields
            if($filters['search_custom'] != FALSE)
            {
                $this->db->from('items');
                $this->db->group_start();
                $this->db->like('custom1', $search);
                $this->db->or_like('custom2', $search);
                $this->db->or_like('custom3', $search);
                $this->db->or_like('custom4', $search);
                $this->db->or_like('custom5', $search);
                $this->db->or_like('custom6', $search);
                $this->db->or_like('custom7', $search);
                $this->db->or_like('custom8', $search);
                $this->db->or_like('custom9', $search);
                $this->db->or_like('custom10', $search);
                $this->db->group_end();
                $this->db->where("item_type = '0'"); // standard, exclude kit items since kits will be picked up later
                $this->db->where("stock_type = '0'"); // stocked items only
                $this->db->where('deleted', $filters['is_deleted']);
                foreach($this->db->get()->result() as $row)
                {
                    $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
                }
            }
        }


        //only return $limit suggestions
        if(count($suggestions > $limit))
        {
            $suggestions = array_slice($suggestions, 0,$limit);
        }

        return $suggestions;
    }

    public function get_kit_search_suggestions($search, $filters = array('is_deleted' => FALSE, 'search_custom' => FALSE), $unique = FALSE, $limit = 25)
    {
        $suggestions = array();

        $this->db->select('item_id, name');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->where("item_type = '1'"); // standard, exclude kit items since kits will be picked up later
        $this->db->like('name', $search);
        $this->db->order_by('name', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
        }

        $this->db->select('item_id, item_number');
        $this->db->from('items');
        $this->db->where('deleted', $filters['is_deleted']);
        $this->db->like('item_number', $search);
        $this->db->order_by('item_number', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->item_id, 'label' => $row->item_number);
        }

        if(!$unique)
        {
            //Search by category
            $this->db->select('category');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->distinct();
            $this->db->like('category', $search);
            $this->db->order_by('category', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->category);
            }

            //Search by supplier
            $this->db->select('company_name');
            $this->db->from('suppliers');
            $this->db->like('company_name', $search);
            // restrict to non deleted companies only if is_deleted is FALSE
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->distinct();
            $this->db->order_by('company_name', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $suggestions[] = array('label' => $row->company_name);
            }

            //Search by description
            $this->db->select('item_id, name, description');
            $this->db->from('items');
            $this->db->where('deleted', $filters['is_deleted']);
            $this->db->like('description', $search);
            $this->db->order_by('description', 'asc');
            foreach($this->db->get()->result() as $row)
            {
                $entry = array('value' => $row->item_id, 'label' => $row->name);
                if(!array_walk($suggestions, function($value, $label) use ($entry) { return $entry['label'] != $label; } ))
                {
                    $suggestions[] = $entry;
                }
            }

            //Search by custom fields
            if($filters['search_custom'] != FALSE)
            {
                $this->db->from('items');
                $this->db->group_start();
                $this->db->like('custom1', $search);
                $this->db->or_like('custom2', $search);
                $this->db->or_like('custom3', $search);
                $this->db->or_like('custom4', $search);
                $this->db->or_like('custom5', $search);
                $this->db->or_like('custom6', $search);
                $this->db->or_like('custom7', $search);
                $this->db->or_like('custom8', $search);
                $this->db->or_like('custom9', $search);
                $this->db->or_like('custom10', $search);
                $this->db->group_end();
                $this->db->where('deleted', $filters['is_deleted']);
                foreach($this->db->get()->result() as $row)
                {
                    $suggestions[] = array('value' => $row->item_id, 'label' => $row->name);
                }
            }
        }

        //only return $limit suggestions
        if(count($suggestions > $limit))
        {
            $suggestions = array_slice($suggestions, 0,$limit);
        }

        return $suggestions;
    }

    public function get_category_suggestions($search)
    {
        $suggestions = array();
        $this->db->distinct();
        $this->db->select('category');
        $this->db->from('items');
        $this->db->like('category', $search);
        $this->db->where('deleted', 0);
        $this->db->order_by('category', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('label' => $row->category);
        }

        return $suggestions;
    }

    public function get_location_suggestions($search)
    {
        $suggestions = array();
        $this->db->distinct();
        $this->db->select('location');
        $this->db->from('items');
        $this->db->like('location', $search);
        $this->db->where('deleted', 0);
        $this->db->order_by('location', 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('label' => $row->location);
        }

        return $suggestions;
    }

    public function get_custom_suggestions($search, $field_no)
    {
        $suggestions = array();
        $this->db->distinct();
        $this->db->select('custom'.$field_no);
        $this->db->from('items');
        $this->db->like('custom'.$field_no, $search);
        $this->db->where('deleted', 0);
        $this->db->order_by('custom'.$field_no, 'asc');
        foreach($this->db->get()->result() as $row)
        {
            $row_array = (array) $row;
            $suggestions[] = array('label' => $row_array['custom'.$field_no]);
        }

        return $suggestions;
    }

    public function get_categories()
    {
        $this->db->select('category');
        $this->db->from('items');
        $this->db->where('deleted', 0);
        $this->db->distinct();
        $this->db->order_by('category', 'asc');

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

    /*
     * changes the cost price of a given item
     * calculates the average price between received items and items on stock
     * $item_id : the item which price should be changed
     * $items_received : the amount of new items received
     * $new_price : the cost-price for the newly received items
     * $old_price (optional) : the current-cost-price
     *
     * used in receiving-process to update cost-price if changed
     * caution: must be used before item_quantities gets updated, otherwise the average price is wrong!
     *
     */
    public function change_cost_price($item_id, $items_received, $new_price, $old_price = null)
    {
        if($old_price === null)
        {
            $item_info = $this->get_info($item_id);
            $old_price = $item_info->cost_price;
        }

        $this->db->from('item_quantities');
        $this->db->select_sum('quantity');
        $this->db->where('item_id', $item_id);
        $this->db->join('stock_locations', 'stock_locations.location_id=item_quantities.location_id');
        $this->db->where('stock_locations.deleted', 0);
        $old_total_quantity = $this->db->get()->row()->quantity;

        $total_quantity = $old_total_quantity + $items_received;
        $average_price = bcdiv(bcadd(bcmul($items_received, $new_price), bcmul($old_total_quantity, $old_price)), $total_quantity);

        $data = array('cost_price' => $average_price);

        return $this->save($data, $item_id);
    }
}
?>