import { readAll } from "https://deno.land/std@0.191.0/streams/read_all.ts";
import { assertEquals } from "https://deno.land/std/testing/asserts.ts";
import { AsyncIterableReader } from "../src/utils.ts";
import { randomNumbers, range } from "./utils.ts";


Deno.test("AsyncIterableReader", async (t) => {

    async function* miniSource(){
        yield Promise.resolve(new Uint8Array([1, 2, 3]));
        yield Promise.resolve(new Uint8Array([4, 5, 6, 7]));
        yield Promise.resolve(new Uint8Array([8, 9]));
    }

    async function* largeSource(size: number):  AsyncIterable<Uint8Array>{
        let val = 0
        const random = randomNumbers(77, size / 4);
        while(val < size){
            const newVal = Math.min(val + random.next().value, size);
            // console.log(range(val, newVal));
            console.log("<<<<<<<<<<<<<<<<< " + newVal + "/" + size + " ( " + (newVal - val) )
            yield Promise.resolve(new Uint8Array(range(val, newVal)));
            
            val = newVal;
            

        }
        yield Promise.resolve(new Uint8Array([9]));
        console.log(">>>>>>>>>>>>>>>>>>>>>>> ");
        console.log(">>>>>>>>>>>>>>>>>>>>>>> ");
        console.log(">>>>>>>>>>>>>>>>>>>>>>> ");
        console.log(">>>>>>>>>>>>>>>>>>>>>>> ");
    }

    // await t.step('read all mini source', async () => {
    //     const reader = new AsyncIterableReader(miniSource());
    //     const expt = new Uint8Array([1, 2 ,3 ,4 ,5, 6,7,8,9])
    //     assertEquals(await readAll(reader), expt);
    // });

    await t.step('largeSource', async () =>{
        const source = largeSource(32920);
        for await(const _piece of source){
           //
        }
    });


    await t.step('read all large source', async () => {
        // for(let i = 101; i < (32 * 1024 * 50 + 101); i += 1){
        let n = 32 * 1024 * 50 + 101 // 32920; //32 * 1024 * 2;
        n = 32919
        const reader = new AsyncIterableReader(largeSource(n));
        const ret = await readAll(reader);
        assertEquals(ret.length, n);
        // }
    });

});


// <<<<<<<<<<<<<<<<< 5137/32920
// <<<<<<<<<<<<<<<<< 11593/32920
// <<<<<<<<<<<<<<<<< 12563/32920
// <<<<<<<<<<<<<<<<< 15976/32920
// <<<<<<<<<<<<<<<<< 19155/32920
// <<<<<<<<<<<<<<<<< 20038/32920
// <<<<<<<<<<<<<<<<< 26452/32920
// <<<<<<<<<<<<<<<<< 31797/32920
// <<<<<<<<<<<<<<<<< 31994/32920
// <<<<<<<<<<<<<<<<< 32912/32920
// <<<<<<<<<<<<<<<<< 32920/32920


// <<<<<<<<<<<<<<<<< 5137/32920
// <<<<<<<<<<<<<<<<< 11593/32920
// <<<<<<<<<<<<<<<<< 12563/32920
// <<<<<<<<<<<<<<<<< 15976/32920
// <<<<<<<<<<<<<<<<< 19155/32920
// <<<<<<<<<<<<<<<<< 20038/32920
// <<<<<<<<<<<<<<<<< 26452/32920
// <<<<<<<<<<<<<<<<< 31797/32920
// <<<<<<<<<<<<<<<<< 31994/32920