let constants = require('./constants');

let cache = {}


function equalItems(a, b) {
    if (  (typeof(a) === 'undefined') || a.isOffline || b.isOffline ) {
        return false;
    }
    if (
        (a.type === "loading") || (a.type === "interlude")
        || (b.type === "loading") || (b.type === "interlude")
    ) {
        return (a.type === b.type);
    }
    if (a.type != b.type) {
        return false;
    }
    if (a.type !== "program") {
        console.log("no idea how to compare this: " + JSON.stringify(a).slice(0,100) );
        console.log(" with this: " + JSON.stringify(b).slice(0,100) );
    }
    return a.title === b.title;

}


function wereThereTooManyAttempts(sessionId, lineupItem) {

    let t1 =  (new Date()).getTime();

    let previous = cache[sessionId];
    let result = false;

    if (typeof(previous) === 'undefined') {
        previous = cache[sessionId] = {
            t0: t1 - constants.TOO_FREQUENT * 5,
            lineupItem: null,
        };
    } else if (t1 - previous.t0 < constants.TOO_FREQUENT) {
        //certainly too frequent
        result = equalItems( previous.lineupItem, lineupItem );
    }

    cache[sessionId] = {
        t0: t1,
        lineupItem : lineupItem,
    };

    setTimeout( () => {
        if (
            (typeof(cache[sessionId]) !== 'undefined')
            &&
            (cache[sessionId].t0 === t1)
        ) {
            delete cache[sessionId];
        }
    }, constants.TOO_FREQUENT * 5 );

    return result;
    
}

module.exports = wereThereTooManyAttempts;