import { observe } from "./observable";
import * as t from "tap";

const subj1 = observe<number>(({ next, complete }) => {
    next(1);
    complete();
    next(2);
});

const consumer1 = {
    sum: 0,
    next(v: number) {
        this.sum += v;
    }
}

subj1.subscribe(consumer1);
t.equal(consumer1.sum, 1, "Should get only one value");

subj1.subscribe(consumer1);
t.equal(consumer1.sum, 2, "Should get the value again");

const consumer2 = {
    value: 0,
    completed: false,
    next(v: number) { this.value = v; },
    complete() { this.completed = true; }
};

let maps = 0;

subj1
    .map(v => {
        t.comment("map1: " + v * 2);
        maps++;
        return v * 2;
    })
    .map (v => {
        t.comment("map2: " + v * 2);
        maps++;
        return v * 2;
    })
    .map(v => {
        t.comment("map3: " + v * 2);
        maps++;
        return v * 2
    })
    .subscribe(consumer2);

t.equal(consumer2.value, 8, "Should map");
t.equal(maps, 3, "The map chain should not be executed after completion");
t.ok(consumer2.completed, "The completion signal should pass through");