using System;

namespace ytLive.Models;

/// <summary>What kind of session the app is in, for polling decisions.</summary>
public enum SessionPhase
{
    Idle,
    Live,
    Test,
    Recording,
}

/// <summary>Which channel figures a poll should fetch.</summary>
public enum ScoreboardPoll
{
    None,
    SubscribersOnly,
    Both,
}

/// <summary>Polling policy for the scoreboard's two channel figures (creator ruling 2026-10-30).
///
/// <para>Analytics answers in DAYS, and test/record sessions have no public audience — so querying
/// watch hours then is pure waste. Subscriber count is cheap (one quota unit) and moves during any
/// session, so it polls whenever the app is working. Idle means silent.</para></summary>
public static class ScoreboardCadence
{
    public static readonly TimeSpan AnalyticsInterval = TimeSpan.FromMinutes(30);
    public static readonly TimeSpan SubscriberInterval = TimeSpan.FromSeconds(60);

    /// <summary><paramref name="enabled"/> is the layer's master switch. Off means NOTHING is
    /// polled, whatever the session is doing — a hidden scoreboard has no reason to spend quota
    /// (creator ruling 2026-10-30).</summary>
    public static ScoreboardPoll Due(SessionPhase phase, DateTime lastAnalyticsUtc, DateTime lastSubscriberUtc,
        DateTime nowUtc, bool enabled = true)
    {
        if (!enabled) return ScoreboardPoll.None;
        if (phase == SessionPhase.Idle) return ScoreboardPoll.None;

        var analyticsDue = phase == SessionPhase.Live && nowUtc - lastAnalyticsUtc >= AnalyticsInterval;
        var subscribersDue = nowUtc - lastSubscriberUtc >= SubscriberInterval;

        return (analyticsDue, subscribersDue) switch
        {
            (true, true) => ScoreboardPoll.Both,
            (true, false) => ScoreboardPoll.None,       // analytics alone is not a poll kind
            (false, true) => ScoreboardPoll.SubscribersOnly,
            _ => ScoreboardPoll.None,
        };
    }
}