namespace ytLive.Models;

/// <summary>What the top bar's primary action button will do.</summary>
public enum SessionStartKind
{
    Record,
    Live,
    Test,
}

/// <summary>Creator ruling (2026-10-30): the primary button is context-sensitive, so the separate
/// TEST button is gone.
///
/// <list type="bullet">
/// <item>EDIT off + ON-AIR armed → Go Live (the livestream message)</item>
/// <item>EDIT on + ON-AIR armed → Test Stream (the test-livestream message) — a dry run you
/// cannot leak, because every broadcast is private pre-v1 anyway</item>
/// <item>REC armed → Start Recording, whatever EDIT says (there is no test recording)</item>
/// </list>
///
/// <para>Pure so the whole matrix is testable without a window.</para></summary>
public static class SessionStartDecision
{
    /// <summary>
    /// Which kind of session the armed output starts. Since 2026-11-12 there is no inference from
    /// editing: the output stage offers "Private Test Stream" and "Review & Go Live" as separate
    /// buttons, so ON-AIR always means the real livestream and Test is something the creator asks for.
    /// </summary>
    public static SessionStartKind For(bool recordArmed, bool onAirArmed)
    {
        // Neither output armed still starts something: local recording needs no account, and the
        // no-dead-ends rule forbids an inert primary button.
        if (recordArmed || !onAirArmed) return SessionStartKind.Record;
        return SessionStartKind.Live;
    }

    /// <summary>What pressing the button actually does, given whether YouTube is connected.
    /// A signed-out ON-AIR press must start the SIGN-IN flow, not sit there disabled — a dead
    /// primary button is the dead end the design principle forbids (creator, 2026-10-30).</summary>
    public enum Route
    {
        SignIn,
        Record,
        Live,
        Test,
    }

    public static Route RouteFor(SessionStartKind kind, bool connected) => kind switch
    {
        SessionStartKind.Record => Route.Record,
        SessionStartKind.Test => connected ? Route.Test : Route.SignIn,
        _ => connected ? Route.Live : Route.SignIn,
    };

    public static string LabelFor(SessionStartKind kind) => kind switch
    {
        SessionStartKind.Record => "Start Recording",
        SessionStartKind.Test => "Test Stream",
        _ => "Go Live",
    };
}