using System;
using HarmonyLib;
using UnityEngine;

namespace NecromancerTome
{
	/// <summary>
	/// Duke's note ("Записка от Дюка", item noteDuke01) - user request 2026-08-30: "в момент
	/// открытия записки, ставить игру на паузу и проигрывать флэшбек" (at the moment the note is
	/// opened, pause the game and play a flashback). Reuses the exact pause+video pipeline
	/// already built and tested for the Black Portal Stone (see PortalStonePatch.cs's
	/// ActivateBlackPortal - GameManager.Instance.Pause/XUiC_VideoPlayer.PlayVideo, both APIs
	/// decompiled there already, same reasoning applies unchanged here).
	///
	/// FINDING THE RIGHT PATCH POINT: noteDuke01 has no custom C# class of its own - it's a
	/// plain Class="Eat" item (items.xml) whose entire "reading" experience is a vanilla trick:
	/// PromptTitle="noteDuke01"/PromptDescription="noteDuke01Desc" make the ENGINE ITSELF show
	/// the note as a XUiC_MessageBoxWindowGroup.ShowOkCancel(...) confirm box - decompiled
	/// ItemActionEat directly and confirmed it has no UI-showing code of its own at all
	/// (NeedPrompt/PromptTitle/PromptDescription/bPromptChecked are all read, never acted on,
	/// inside that class); the actual ShowOkCancel call lives in the CALLERS instead - two
	/// separate, decompiled call sites:
	///   1. ItemClass.ExecuteAction(int, ItemInventoryData, bool, PlayerActionsLocal) - the
	///      holding-the-item-and-clicking path.
	///   2. XUiC_ItemStack's inventory "Use" (double-click / context-menu) path.
	/// Both funnel through the exact same static XUiC_MessageBoxWindowGroup.ShowOkCancel call -
	/// patching THAT one method, instead of either call site separately, covers both input paths
	/// with a single patch.
	///
	/// IDENTIFYING OUR NOTE: ShowOkCancel receives only already-localized strings, not an item
	/// reference - decompilation confirms this overload has no ItemValue/ItemClass parameter at
	/// all. Matched by comparing the incoming title against Localization.Get("noteDuke01") (the
	/// exact PromptTitle key from items.xml) - unique to this one item in the whole game, not a
	/// generic vanilla dialog string, so this is a safe match, not a guess.
	///
	/// FLOW: on match, suppress the real dialog for now (Prefix returns false), pause the game,
	/// and play the flashback; only once the video finishes (or is skipped/errors - PlayVideo's
	/// own onFinished callback fires in every case, confirmed by decompiling
	/// XUiC_VideoPlayer.OnClose/FinishAndClose, so this can never soft-lock the pause) does it
	/// unpause and open the REAL note-text dialog (a re-entrant call to ShowOkCancel itself, via
	/// a bypass flag so the Prefix doesn't intercept its own follow-up call) - "open note ->
	/// flashback -> read text -> confirm", rather than overlapping the video with the text box.
	///
	/// VIDEO FILE: Video/DukeNoteFlashback.mp4 - the user's real flashback clip (delivered
	/// 2026-08-30 as exch/flashbback.mp4), kept as .mp4 rather than renamed to .webm like the
	/// Black Portal placeholder: Unity's VideoPlayer component (confirmed by decompiling
	/// XUiV_Video - it wraps a plain UnityEngine.Video.VideoPlayer) natively decodes MP4/H.264 on
	/// Windows via Media Foundation, and re-labeling an actual MP4 container as .webm would just
	/// make it fail to decode (VP8/VP9 container expected, not H.264) - not decompiled/proven
	/// that MP4 plays correctly in THIS build, but there is no reason implied by the decompiled
	/// code to expect otherwise, and even a decode failure only degrades to a skipped video (see
	/// FLOW above), never a stuck pause. **Not confirmed in game.**
	/// </summary>
	[HarmonyPatch(typeof(XUiC_MessageBoxWindowGroup), "ShowOkCancel")]
	public static class Patch_XUiC_MessageBoxWindowGroup_ShowOkCancel_NoteFlashback
	{
		public const string NoteFlashbackVideoPath = "@modfolder(NecromancerTome):Video/DukeNoteFlashback.mp4";

		/// <summary>Guards the re-entrant call this patch makes to the very method it patches
		/// (to actually show the note text once the flashback is done) - without this, that
		/// second call would just trigger the Prefix again and loop back into another flashback
		/// instead of showing the dialog. Not [ThreadStatic]: XUi/UI code in this game only ever
		/// runs on the main thread (every other UI-touching patch in this mod makes the same
		/// assumption, e.g. PortalStonePatch.cs's local-player-only UI calls), so a plain static
		/// bool is enough here.</summary>
		public static bool bypass;

		public static bool Prefix(XUi _xuiInstance, string _title, string _text, string _icon, Action _onOk, Action _onCancel, bool _openMainMenuOnClose, bool _modal, bool _cancelOnOutsideClick)
		{
			if (bypass)
			{
				return true;
			}
			if (_xuiInstance == null || _title != Localization.Get("noteDuke01"))
			{
				return true;
			}

			Debug.Log("[NecromancerTome] NoteFlashbackPatch: Duke's note opened, pausing + playing flashback");
			GameManager.Instance.Pause(true);
			VideoData videoData = new VideoData { url = NoteFlashbackVideoPath };
			XUiC_VideoPlayer.PlayVideo(_xuiInstance, videoData, true, delegate(bool skipped)
			{
				Debug.Log("[NecromancerTome] NoteFlashbackPatch: flashback finished (skipped=" + skipped + "), unpausing and showing note text");
				GameManager.Instance.Pause(false);
				bypass = true;
				try
				{
					XUiC_MessageBoxWindowGroup.ShowOkCancel(_xuiInstance, _title, _text, _icon, _onOk, _onCancel, _openMainMenuOnClose, _modal, _cancelOnOutsideClick);
				}
				finally
				{
					bypass = false;
				}
			});
			return false;
		}
	}
}