drop.chapril.org-firefoxsend/app/experiments.js

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import hash from 'string-hash';
import Account from './ui/account';
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const experiments = {
signin_button_color: {
eligible: function() {
return true;
},
variant: function() {
return ['white-blue', 'blue', 'white-violet', 'violet'][
Math.floor(Math.random() * 4)
];
},
run: function(variant, state) {
const account = state.cache(Account, 'account');
account.buttonClass = variant;
}
}
};
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//Returns a number between 0 and 1
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// eslint-disable-next-line no-unused-vars
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function luckyNumber(str) {
return hash(str) / 0xffffffff;
}
function checkExperiments(state, emitter) {
const all = Object.keys(experiments);
const id = all.find(id => experiments[id].eligible(state));
if (id) {
const variant = experiments[id].variant(state);
state.storage.enroll(id, variant);
experiments[id].run(variant, state, emitter);
}
}
export default function initialize(state, emitter) {
emitter.on('DOMContentLoaded', () => {
const xp = experiments[state.query.x];
if (xp) {
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xp.run(+state.query.v, state, emitter);
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}
});
const enrolled = state.storage.enrolled;
// single experiment per session for now
const id = Object.keys(enrolled)[0];
if (Object.keys(experiments).includes(id)) {
experiments[id].run(enrolled[id], state, emitter);
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} else {
checkExperiments(state, emitter);
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}
}