// iterator
package main

import (
	"fmt"
	"github.com/garyburd/redigo/redis"
	"log"
	"time"
)

type produced struct {
	user   string
	logins []string
}

func producer(consume chan produced, done chan bool) {
	conn := dbs.rdb.Get()
	defer conn.Close()

	for loop {

		start := time.Now()
		// estrae un userid dalla lista degli utenti che hanno fatto login
		user, err := redis.String(conn.Do("spop", "llindex"))
		if opts.Debug {
			log.Printf("SPOP: %+v - %+v\n\r", user, err)
			fmt.Printf("SPOP: %+v - %+v\n\r", user, err)
		}
		// se non ci sono piu' userid esce
		if err != nil {
			if opts.Debug {
				log.Printf("LLINDEX empty: %v\n\r", err)
				fmt.Printf("LLINDEX empty: %v\n\r", err)
			}
			loop = false
			done <- true
			break
		}

		// estrae tutti i login dell'utente "user"
		logs, err := redis.Strings(conn.Do("lrange", user, "0", "-1"))
		if err != nil {
			fmt.Printf("LRANGE: %+v - %+v\n\r", err, logs)
			log.Printf("LRANGE: %+v - %+v\n\r", err, logs)
		}
		if opts.Debug {
			fmt.Printf("LRANGE: %s - %d\n\r", user, len(logs))
			log.Printf("LRANGE: %s - %d\n\r", user, len(logs))
		}

		if opts.Debug {
			fmt.Printf("PROD: user=%s in %v - conn=%d\n\r", user, time.Since(start), dbs.rdb.ActiveCount())
		}

		consume <- produced{
			user:   user,
			logins: logs,
		}
	}
}