using MegaCrit.Sts2.Core.Combat;
using STS2RitsuLib;
using STS2RitsuLib.Lifecycle;

namespace VulnerabilityIndicator.Scripts;

/// <summary>
/// Observes lifecycle events to trigger vulnerability checker updates
/// when cards change or turns start.
/// </summary>
public sealed class VulnerabilityLifecycleObserver : ILifecycleObserver
{
    public void OnEvent(IFrameworkLifecycleEvent evt)
    {
        var checker = VulnerabilityChecker.Instance;
        if (checker == null) return;

        // Card drawn - hand contents changed
        if (evt is CardDrawnEvent)
        {
            checker.OnCardChanged();
            return;
        }

        // Card discarded - hand contents changed
        if (evt is CardDiscardedEvent)
        {
            checker.OnCardChanged();
            return;
        }

        // Card played - hand contents changed
        if (evt is CardPlayedEvent)
        {
            checker.OnCardChanged();
            return;
        }

        // End of turn - cards flushed
        if (evt is CardsFlushedEvent)
        {
            checker.OnCardChanged();
            return;
        }

        // New side turn - might have drawn new cards
        if (evt is SideTurnStartedEvent)
        {
            checker.OnCardChanged();
            return;
        }

        // Combat starting - initialize checker
        if (evt is CombatStartingEvent cse)
        {
            if (cse.CombatState is CombatState cs)
            {
                VulnerabilityChecker.GetOrCreate().Initialize(cs);
            }
        }
    }
}