package main

import (
    "fmt"
    "time"
)

func main() {

    //create channels
    intchan := make(chan int)
    floatchan1 := make(chan float64)
    floatchan2 := make(chan float64)

    //launch go rountines
    go fib(intchan)
    go ratio(floatchan1, floatchan2)

    //initialize the process; pretty much fib(50)
    intchan <- 50

    //print each number from fib() and ratio()
    for i := 0; i < 50; i++ {
        fibnum := <-intchan
        floatchan1 <- float64(fibnum)

        //floatchan2 doesn't have any values in it; waiting
        //for at least two values from floatchan1 in ratio()!
        ratio := <-floatchan2
        fmt.Println(fibnum, " - ", ratio)
        time.Sleep(time.Millisecond * 250)
    }
}

//Pretty standard fib() function
func fib(intchan chan int) {
    var next, current, last int

    length := <-intchan

    for i := 0; i < length; i++ {
        if current == 0 {
            next = 1
        } else {
            next = current + last
        }

        last = current
        current = next

        //put fib() result to channel
        intchan <- next
    }
}

func ratio(floatchan1 chan float64, floatchan2 chan float64) {
    var ratio float64

    //get two consecutive values
    x := <-floatchan1
    y := <-floatchan1

    //ratio approches golden ratio as loop goes on
    ratio = x / y

    //put ratio() result to channel to be printed in main()
    floatchan2 <- ratio
}