magento soap api how to achieve layered navigation

Question

I am developing a mobile app using magento 1.9 SOAP API, I have integrated all the API endpoints and the functionality is almost complete. The issue I am facing is to implement layered navigation as it is displayed on magento website but there is no API endpoint to achieve this.

Can anyone please suggest me how we can handle this? as I am an android developer and trying to figure this out.

Thanks Shani

Update This is what I have achieved so far

    $categoryid = (int)$this->getRequest()->getParam('cid');
    $designid = $this->getRequest()->getParam('manufacturer');
    $sizeid = $this->getRequest()->getParam('size');
    $colorid = $this->getRequest()->getParam('color');
    $pricerange = $this->getRequest()->getParam('price');

    $layer = Mage::getSingleton("catalog/layer"); 
    $_category = Mage::getSingleton("catalog/category")->load($categoryid);
    $layer->setCurrentCategory($_category);
    $attributes = $layer->getFilterableAttributes();

    $attrs["design"]['label'] = __("Brands");
    $attributeCode = Mage::getStoreConfig('shopbybrand/general/attribute_code', $storeId);        
    $attrCode = $attributeCode ? $attributeCode : 'manufacturer';
    $attrs["design"]['code'] = $attrCode;
    $attrs["design"]['sort'] = 1;

    $attrs["color"]['label'] = __("Color");
    $attrs["color"]['code'] = __("color");
    $attrs["color"]['sort'] = 2;

    $attrs["size"]['label'] = __("Size");
    $attrs["size"]['code'] = __("size");
    $attrs["size"]['sort'] = 3;

    $attrs["price"]['label'] = __("Price");
    $attrs["price"]['code'] = __("price");
    $attrs["price"]['sort'] = 4;

    // print_r($attributes->getData());exit();
    $attributeCollection =array();

    $i=0;
    $attributeCollection = array();
    foreach ($attributes as $attribute) {
    if($attribute->getAttributeCode() == 'price') {
     $filterBlockName = 'catalog/layer_filter_price';
    }elseif($attribute->getBackendType() == 'decimal'){
     $filterBlockName = 'catalog/layer_filter_decimal';
    }else{
    $filterBlockName = 'catalog/layer_filter_attribute';
    }
    $result = Mage::app()->getLayout()->createBlock($filterBlockName)->setLayer($layer)->setAttributeModel($attribute)->init();
    $attributeCollection[$i]['Code'] = $attribute->getAttributeCode();
    $attributeCollection[$i]['Label'] = $attribute->getStoreLabel();
    $j=0;
    $attributeOptionCollection =array();
    foreach($result->getItems() as $option) {
        $val = $option->getValue();
        if($attribute->getAttributeCode()=='price'){
            $attrs["price"]['options'][$j]['label'] = strip_tags($option->getLabel());
            if(trim($val) == ""){
                $val = $pricerange;
                }
            $val_arr = explode(',',$val);
            $pricerange_arr = explode(',',$pricerange);
            if(strstr($pricerange,',') || strstr($val,',')){
                $val = array_merge(array_diff($val_arr, $pricerange_arr), array_diff($pricerange_arr, $val_arr));
                $val = $val[0];
                }   
            $attrs["price"]['options'][$j]['value'] = $val;
        }elseif($attribute->getAttributeCode()=='color'){
            $attrs["color"]['options'][$j]['label'] = $option->getLabel();
            if(trim($val) == ""){
                $val = $colorid;
                }
            $val_arr = explode(',',$val);
            $colorid_arr = explode(',',$colorid);
            if(strstr($colorid,',') || strstr($val,',')){
                $val = array_merge(array_diff($val_arr, $colorid_arr), array_diff($colorid_arr, $val_arr));
                $val = $val[0];
                }
            $attrs["color"]['options'][$j]['value'] = $val;
        }elseif($attribute->getAttributeCode()=='size'){
            $attrs["size"]['options'][$j]['label'] = $option->getLabel();
            if(trim($val) == ""){
                $val = $sizeid;
                }
            $val_arr = explode(',',$val);
            $sizeid_arr = explode(',',$sizeid);
            if(strstr($sizeid,',') || strstr($val,',')){
                $val = array_merge(array_diff($val_arr, $sizeid_arr), array_diff($sizeid_arr, $val_arr));
                $val = $val[0];
                }
            $attrs["size"]['options'][$j]['value'] = $val;
        }elseif($attribute->getAttributeCode()=='manufacturer'){
            $attrs["design"]['options'][$j]['label'] = $option->getLabel();
            if(trim($val) == ""){
                $val = $designid;
                }
            $val_arr = explode(',',$val);
            $designid_arr = explode(',',$designid);
            if(strstr($designid,',') || strstr($val,',')){
                $val = array_merge(array_diff($val_arr, $designid_arr), array_diff($designid_arr, $val_arr));
                $val = $val[0];
                }
        $attrs["design"]['options'][$j]['value'] = $val;
    }
    $j++;
    }
    //$attributeCollection[$i]['Options'] = $attributeOptionCollection;
    $i++;
    }
    header("Content-Type: application/json");
    print_r(json_encode($attrs));
    die;    

Answer 1

You can not get direct leyer navigation value, you need to call on by one api for getting all the value in leyer navigation.

e.g in layer navigation you have Category tree and 4 attribute filter then you need to create 2 api, one for category tree and one for attribute list will value.

Hope so it's help you.