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<?php
class Tax extends CI_Model
{
    /*
    Determines if a given tax_code is on file
    */
    public function exists($tax_code)
    {
        $this->db->from('tax_codes');
        $this->db->where('tax_code', $tax_code);

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

    public function tax_rate_exists($tax_code, $tax_category_id)
    {
        $this->db->from('tax_code_rates');
        $this->db->where('rate_tax_code', $tax_code);
        $this->db->where('rate_tax_category_id', $tax_category_id);

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

    /*
    Gets total of rows
    */
    public function get_total_rows()
    {
        $this->db->from('tax_codes');

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

    /*
    Gets information about a particular tax_code
    */
    public function get_info($tax_code)
    {
        $this->db->from('tax_codes');
        $this->db->join('tax_code_rates',
            'tax_code = rate_tax_code and rate_tax_category_id = 0', 'LEFT');
        $this->db->join('tax_categories',
            'rate_tax_category_id = tax_category_id');
        $this->db->where('tax_code', $tax_code);

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

        if($query->num_rows() == 1)
        {
            return $query->row();
        }
        else
        {
            //Get empty base parent object
            $tax_code_obj = new stdClass();

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

            return $tax_code_obj;
        }
    }

    /*
Gets information about a particular tax_code
*/
    public function get_rate_info($tax_code, $tax_category_id)
    {
        $this->db->from('tax_code_rates');
        $this->db->join('tax_categories',
            'rate_tax_category_id = tax_category_id');
        $this->db->where('rate_tax_code', $tax_code);
        $this->db->where('rate_tax_category_id', $tax_category_id);

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

        if($query->num_rows() == 1)
        {
            return $query->row();
        }
        else
        {
            //Get empty base parent object
            $tax_rate_obj = new stdClass();

            //Get all the fields from tax_codes table
            foreach($this->db->list_fields('tax_code_rates') as $field)
            {
                $tax_rate_obj->$field = '';
            }
            //Get all the fields from tax_code_rates table
            foreach($this->db->list_fields('tax_categories') as $field)
            {
                $tax_rate_obj->$field = '';
            }

            return $tax_rate_obj;
        }
    }

    /*
     * Gets the tax code to use for a given customer
     */
    public function get_sales_tax_code($city = '', $state = '')
    {
        // if tax code using both city and state cannot be found then  try again using just the state
        // if the state tax code cannot be found then try again using blanks for both
        $this->db->from('tax_codes');
        $this->db->where('city', $city);
        $this->db->where('state', $state);
        $this->db->where('tax_code_type', '0'); // sales tax

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

        if($query->num_rows() == 1)
        {
            return $query->row()->tax_code;
        }
        else
        {
            $this->db->from('tax_codes');
            $this->db->where('city', '');
            $this->db->where('state', $state);
            $this->db->where('tax_code_type', '0'); // sales tax

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

            if($query->num_rows() == 1)
            {
                return $query->row()->tax_code;
            }
            else
            {
                return $this->config->item('default_origin_tax_code');
            }
        }

        return FALSE;
    }

    /*
    Inserts or updates a tax_codes entry
    */
    public function save(&$tax_code_data, $tax_rate_data, $tax_code = -1)
    {
        if(!$this->exists($tax_code))
        {
            if($this->db->insert('tax_codes', $tax_code_data))
            {
                $this->save_tax_rates($tax_rate_data, $tax_code);
                return TRUE;
            }

            return FALSE;
        }

        $this->db->where('tax_code', $tax_code);
        if ($this->db->update('tax_codes', $tax_code_data))
        {
            $this->save_tax_rates($tax_rate_data, $tax_code);
            return TRUE;
        }
        else
        {
            return  FALSE;
        }
    }

    public function save_tax_rates(&$tax_rate_data, $tax_code)
    {
        if(!$this->tax_rate_exists($tax_code, $tax_rate_data['rate_tax_category_id']))
        {
            if($this->db->insert('tax_code_rates', $tax_rate_data))
            {
                return TRUE;
            }

            return FALSE;
        }

        $this->db->where('rate_tax_code', $tax_code);
        $this->db->where('rate_tax_category_id', $tax_rate_data['rate_tax_category_id']);

        return $this->db->update('tax_code_rates', $tax_rate_data);
    }

    /*
    Inserts or updates an item kit's items
    */
    public function save_tax_rate_exceptions(&$tax_rate_data, $tax_code)
    {
        $success = TRUE;

        //Run these queries as a transaction, we want to make sure we do all or nothing

        $this->db->trans_start();

        // Delete all exceptions for the given tax_code
        $this->delete_tax_rate_exceptions($tax_code);

        if ($tax_rate_data != NULL)
        {
            foreach ($tax_rate_data as $row) 
            {
                $row['rate_tax_code'] = $tax_code;
                $success &= $this->db->insert('tax_code_rates', $row);
            }
        }

        $this->db->trans_complete();

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

        return $success;
    }

    /*
    Deletes one tax_codes entry
    */
    public function delete($tax_code)
    {
        return $this->db->delete('tax_codes', array('tax_code' => $tax_code));
    }

    /*
    Deletes a list of tax codes
    */
    public function delete_list($tax_codes)
    {
        $this->db->where_in('tax_code', $tax_codes);

        return $this->db->delete('tax_codes');
    }


    /*
    Deletes all tax_rate_exceptions for given tax codes
    */
    public function delete_tax_rate_exceptions($tax_code)
    {
        $this->db->where('rate_tax_code', $tax_code);
        $this->db->where('rate_tax_category_id !=', 0);

        return $this->db->delete('tax_code_rates');
    }

    /*
    Performs a search on tax_codes
    */
    public function search($search, $rows = 0, $limit_from = 0, $sort = 'tax_code', $order = 'asc')
    {
        $this->db->from('tax_codes');
        $this->db->join('tax_code_rates',
            'tax_code = rate_tax_code and rate_tax_category_id = 0', 'LEFT');
        if (!empty($search))
        {
            $this->db->like('tax_code', $search);
            $this->db->or_like('tax_code_name', $search);
        }
        $this->db->order_by($sort, $order);

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

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

    /*
    Gets tax_codes
    */
    public function get_found_rows($search)
    {
        $this->db->from('tax_codes');
        if (!empty($search))
        {
            $this->db->like('tax_code', $search);
            $this->db->or_like('tax_code_name', $search);
        }

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

    public function get_tax_code_type_name($tax_code_type) {
        if ($tax_code_type == '0')
        {
            return $this->lang->line('taxes_sales_tax');
        }
        else
        {
            return $this->lang->line('taxes_vat_tax');
        }
    }

    public function get_sales_tax_codes_search_suggestions($search, $limit = 25)
    {

        $suggestions = array();

        $this->db->from('tax_codes');
        if (!empty($search))
        {
            $this->db->like('tax_code', $search);
            $this->db->or_like('tax_code_name', $search);
        }
        $this->db->order_by('tax_code_name', 'asc');

        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->tax_code, 'label' => ($row->tax_code . ' ' . $row->tax_code_name));
        }

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

        return $suggestions;
    }

    public function get_tax_category_suggestions($search)
    {
        $suggestions = array();

        $this->db->from('tax_categories');
        $this->db->where('tax_category_id !=', 0);
        if (!empty($search))
        {
            $this->db->like('tax_category', '%'.$search.'%');
        }
        $this->db->order_by('tax_category', 'asc');

        foreach($this->db->get()->result() as $row)
        {
            $suggestions[] = array('value' => $row->tax_category_id, 'label' => $row->tax_category);
        }

        return $suggestions;
    }

    public function get_tax_category($tax_category_id)
    {
        $this->db->select('tax_category');
        $this->db->from('tax_categories');
        $this->db->where('tax_category_id', $tax_category_id);

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

    public function get_all_tax_categories()
    {
        $this->db->from('tax_categories');
        $this->db->order_by('tax_category_id');

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

    public function get_tax_category_id($tax_category)
    {
        $this->db->select('tax_category_id');
        $this->db->from('tax_categories');

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

    public function get_tax_code_rate_exceptions($tax_code)
    {
        $this->db->from('tax_code_rates');
        $this->db->join('tax_categories', 'rate_tax_category_id = tax_category_id');
        $this->db->where('rate_tax_code', $tax_code);
        $this->db->where('rate_tax_category_id !=', 0);
        $this->db->order_by('tax_category', 'asc');

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