using System.Diagnostics.CodeAnalysis;
using ADOFAIRenderer.Core;
using HarmonyLib;

namespace ADOFAIRenderer.Patch.Game;

/// <summary>
/// Suppresses the end-screen lanterns (level complete / accuracy / speed trial lamps) shown after a clear.
/// <para>
/// Patched members: <c>EndscreenLanterns.Show(scrPlayer, float, int, bool)</c>, which activates the lantern set, sets the
/// lantern texts and starts DOTween sequences (<c>chainSequence</c> for the chain drop, <c>lampSequences[3]</c> for the lamp
/// effects), returning the number of lanterns shown; and <c>EndscreenLanterns.Hide()</c>, which deactivates the GameObject.
/// </para>
/// <para>
/// Active while <see cref="RenderManager.IsActive"/> (stage &gt;= OnScene), so the lanterns and their tweens do not appear in
/// the rendered video during the delay after the level end. See also <see cref="scrUIControllerPatch"/>.
/// </para>
/// </summary>
[HarmonyPatch(typeof(EndscreenLanterns))]
// ReSharper disable once InconsistentNaming
public static class EndscreenLanternsPatch
{
    /// <summary>
    /// Prefix of <c>EndscreenLanterns.Show</c>. While rendering, hides the lantern set (which also runs
    /// <see cref="PrefixHide"/>) and reports zero lanterns shown.
    /// </summary>
    /// <param name="__instance">The lantern set being shown.</param>
    /// <param name="__result">Return value of Show: number of lanterns shown; set to 0 when the original is skipped.</param>
    /// <returns>True to run the original method (not rendering); false to skip it (rendering).</returns>
    [HarmonyPrefix]
    [HarmonyPatch("Show")]
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    public static bool ForceHide(EndscreenLanterns __instance, ref int __result)
    {
        if (!RenderManager.IsActive) return true;
        if (__instance != null)
        {
            __instance.Hide();
        }
        __result = 0; // Return 0 lanterns shown
        return false; // Skip original Show method
    }

    /// <summary>
    /// Prefix of <c>EndscreenLanterns.Hide</c>. While rendering, releases the lantern tweens started by an earlier Show
    /// before the original deactivates the GameObject.
    /// <para>
    /// The private fields <c>lampSequences</c> (DOTween <c>Sequence[]</c>) and <c>chainSequence</c> (<c>Sequence</c>) are read
    /// through Harmony <see cref="Traverse"/>. For each sequence, a public instance method <c>Kill(bool)</c> is looked up on the
    /// object's runtime type by reflection and invoked with <c>false</c> when found; then the field slot is set to null.
    /// In the game's DOTween.dll, <c>Kill(this Tween, bool complete = false)</c> is an extension method of
    /// <c>DG.Tweening.TweenExtensions</c>, so the lookup on <c>Sequence</c> returns null and no Kill is invoked; the effect is
    /// that the fields stop referencing the sequences, while the sequences themselves keep running in DOTween.
    /// Reflection failures on a single sequence (including a null array element) are ignored. The original Hide always runs
    /// afterwards.
    /// </para>
    /// </summary>
    /// <param name="__instance">The lantern set being hidden.</param>
    [HarmonyPrefix]
    [HarmonyPatch("Hide")]
    [SuppressMessage("ReSharper", "InconsistentNaming")]
    public static void PrefixHide(EndscreenLanterns __instance)
    {
        if (__instance == null) return;
        if (!RenderManager.IsActive) return;

        var traverse = Traverse.Create(__instance);
            
        // Kill lampSequences (private Sequence[] lampSequences) via reflection
        var lampSequencesField = traverse.Field("lampSequences");
        var lampSequencesObj = lampSequencesField.GetValue();
        if (lampSequencesObj is System.Array lampSequencesArray)
        {
            for (var i = 0; i < lampSequencesArray.Length; i++)
            {
                var item = lampSequencesArray.GetValue(i);
                try
                {
                    var killMethod = item.GetType().GetMethod("Kill", new[] { typeof(bool) });
                    killMethod?.Invoke(item, new object[] { false });
                }
                catch
                {
                    // Ignore reflection errors
                }
                lampSequencesArray.SetValue(null, i);
            }
        }

        // Kill chainSequence (private Sequence chainSequence) via reflection
        var chainSequenceField = traverse.Field("chainSequence");
        var chainSequenceObj = chainSequenceField.GetValue();
        if (chainSequenceObj == null) return;
            
        try
        {
            var killMethod = chainSequenceObj.GetType().GetMethod("Kill", new[] { typeof(bool) });
            killMethod?.Invoke(chainSequenceObj, new object[] { false });
        }
        catch
        {
            // Ignore reflection errors
        }
        chainSequenceField.SetValue(null);
    }
}