const assert  = require('assert');
const request = require('supertest');

const TEST_URL = process.env.TEST_URL;

function randomString(len) {
   var result = '';
   var chars = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
   var charsLen = chars.length;
   for (let i = 0; i < len; i++) {
      result += chars.charAt(Math.floor(Math.random() * charsLen));
   }
   return result;
}


function newValue(len) {
    return `KASK:V:TEST_${randomString(len)}`;
}


describe('CRUD', function() {
    const key = `KASK:K:TEST_${randomString(64)}`;
    const val = newValue(128);

    it('creates', function() {
        // GET should 404 (key has not yet been written)
        request(TEST_URL)
            .get(`/${key}`)
            .expect(404);

        request(TEST_URL)
            .post(`/${key}`)
            .set('Content-Type', 'application/octet-stream')
            .send(val)
            .expect(201);
    });
    it('reads', function() {
        request(TEST_URL)
            .get(`/${key}`)
            .expect('Content-Type', 'application/octet-stream')
            .expect(200)
            .expect(response => assert.equal(response.body, val));
    });
    it('updates', function() {
        const v = newValue(128);
        
        request(TEST_URL)
            .post(`/${key}`)
            .set('Content-Type', 'application/octet-stream')
            .send(v)
            .expect(201);
        
        request(TEST_URL)
            .get(`/${key}`)
            .expect('Content-Type', 'application/octet-stream')
            .expect(200)
            .expect(response => assert.equal(response.body, v));
    });
    it('deletes', function() {
        request(TEST_URL)
            .delete(`/${key}`)
            .expect(204);
        
        request(TEST_URL)
            .get(`/${key}`)
            .expect(404);
    });
});