package client

import (
	"io"
	"log"
	"time"
)

func listen(c *FhoClient, object string, lastUpdatedTime time.Time, fn func(*[]map[string]interface{})) error {
	snap, err := c.QuerySnapshot(object, lastUpdatedTime)
	if err != nil {
		log.Println("listen error:", err.Error())
		return err
	}
	for {
		data, err := snap.Next()
		if err == io.EOF {
			log.Println("Error EOF")
			break
		}
		if err != nil {
			log.Println("Error:", err.Error())
			break
		}
		fn(data)
	}
	return nil
}

func ListenOnProducts(c *FhoClient, lastUpdatedTime time.Time, fn func([]*Product)) error {
	listen(c, "products", lastUpdatedTime, func(data *[]map[string]interface{}) {
		var products []*Product
		for _, rec := range *data {
			_product := ProductFromMap(rec)
			products = append(products, _product)
		}
		fn(products)
	})
	return nil
}