using System.Collections.Generic;
using UnityEngine.Scripting;

namespace NecromancerTome
{
	/// <summary>
	/// `necroghost [percent|reset]` - turns the traders' transparency live, without a rebuild
	/// (user request 2026-09-14, right after the alpha went from 1% to 10%: "Сделай консольную
	/// команду на альфу, чтобы крутить в игре"). The number being hunted - "a ghost, not a broken
	/// model" - can only be judged by looking at him, and every step of that hunt otherwise costs
	/// an edit, a `dotnet build`, a restart and the four-minute walk back to a trader, because
	/// traders are streamed in on approach. This collapses the loop to one line in the console.
	///
	/// IT TAKES PERCENT OF TRANSPARENCY, NOT ALPHA, and that is deliberate: percent is the unit
	/// the request has been made in twice ("буквально 1%", "пусть будет 10%"), while alpha is the
	/// unit the renderer wants, and they run in opposite directions - 10% transparent is alpha
	/// 0.9. Guessing which one a typed "10" meant would be a coin flip, so the command fixes the
	/// unit and prints both back every time.
	///
	/// NOTHING IS PERSISTED. The value lives for the session; the one that turns out to be right
	/// gets written into GhostTraderPatch.DefaultGhostAlpha, which is the line a release ships.
	/// A settings file would just be a second place for the answer to hide.
	///
	/// WHY THE GAME FINDS THIS CLASS WITHOUT ANY REGISTRATION. SdtdConsole.RegisterCommands goes
	/// through ReflectionHelpers.FindTypesImplementingBase(typeof(IConsoleCommand)), and that
	/// walks ModManager.GetLoadedAssemblies() alongside the game's own - so a ConsoleCmdAbstract
	/// in a mod DLL is picked up like any vanilla one. Ordering is not a gamble either:
	/// GameManager calls ModManager.LoadMods() three lines before RegisterCommands().
	///
	/// IsExecuteOnClient IS true BECAUSE THIS CHANGES PIXELS. On a server the command would
	/// otherwise run where there is nothing to look at; the flag makes the server bounce it back
	/// to the client that typed it (ConnectionManager.ServerConsoleCommand), which is where the
	/// materials and the eyes are. In single player it changes nothing.
	/// </summary>
	[Preserve]
	public class ConsoleCmdNecroGhost : ConsoleCmdAbstract
	{
		public override bool IsExecuteOnClient => true;

		public override bool AllowedInMainMenu => false;

		public override string[] getCommands()
		{
			return new string[] { "necroghost", "necrotrader" };
		}

		public override string getDescription()
		{
			return "Necromancer's Tome: how transparent the ghost traders are, in percent.";
		}

		public override string getHelp()
		{
			return "necroghost              - show the current value and mode\n" +
			       "necroghost <0-100>      - set transparency in percent (10 = the default, barely there;\n" +
			       "                          30 = clearly a ghost; past ~30 he stops reading as a body)\n" +
			       "necroghost blend        - fade the body by blending  (re-shades it; smooth)\n" +
			       "necroghost dither       - fade the body by dithering (the game's own _Fade; grainy)\n" +
			       "necroghost reset        - back to the built-in default value and mode\n" +
			       "\n" +
			       "Applies to traders already in the world, immediately - walk up to one first and\n" +
			       "watch him while you type. Not saved: tell the mod author what you settled on.\n" +
			       "\n" +
			       "THE MODES ARE NOT DEGREES OF ONE THING. The body's own shader cannot blend, so the\n" +
			       "game fades it by throwing pixels away in a pattern - that is the fine grid. Blend\n" +
			       "re-shades the body onto the hair's shader, which has a transparent pass, at the\n" +
			       "cost of the character shader's own lighting. The hair fades the same way either\n" +
			       "way, so it is the body you compare.\n" +
			       "\n" +
			       "If he comes apart instead of fading - teeth through the cheek, an arm through the\n" +
			       "chest - that is not this number, that is depth writing, and no value here will fix it.";
		}

		public override void Execute(List<string> _params, CommandSenderInfo _senderInfo)
		{
			if (_params.Count == 0)
			{
				Report("Ghost traders");
				return;
			}

			string argument = _params[0].Trim();
			if (argument.EqualsCaseInsensitive("reset"))
			{
				GhostTraderPatch.GhostAlpha = GhostTraderPatch.DefaultGhostAlpha;
				SetMode(GhostTraderPatch.BodyOpacityMode.Blend, "Reset");
				return;
			}

			if (argument.EqualsCaseInsensitive("blend"))
			{
				SetMode(GhostTraderPatch.BodyOpacityMode.Blend, "Body mode");
				return;
			}

			if (argument.EqualsCaseInsensitive("dither"))
			{
				SetMode(GhostTraderPatch.BodyOpacityMode.Dither, "Body mode");
				return;
			}

			if (!TryParsePercent(argument, out float percent))
			{
				SingletonMonoBehaviour<SdtdConsole>.Instance.Output(
					"necroghost: '" + argument + "' is neither a percentage nor blend/dither/reset. " +
					"Try 'necroghost 10', or 'help necroghost'.");
				return;
			}

			if (percent < 0f || percent > 100f)
			{
				SingletonMonoBehaviour<SdtdConsole>.Instance.Output(
					"necroghost: " + percent.ToString("0.#") + "% is outside 0-100. 0 = solid, 100 = invisible.");
				return;
			}

			GhostTraderPatch.GhostAlpha = 1f - percent / 100f;
			Report("Set");

			// Said only when asked for, and only once the value is actually past the point where
			// the two failure modes stop looking different - see GhostTraderPatch.GhostAlpha.
			if (GhostTraderPatch.GhostAlpha < 0.7f)
			{
				SingletonMonoBehaviour<SdtdConsole>.Instance.Output(
					"  (past ~30% the silhouette stops reading as a solid body at all, which looks like " +
					"a broken model for a different reason than depth writing does)");
			}
		}

		/// <summary>Switches how the body is faded and rebuilds the traders already standing, which
		/// is the expensive path - the materials have to be built again from the originals, since
		/// a re-shaded material cannot be un-re-shaded. Changing only the number never comes here.
		/// Saying so out loud matters: this is the one thing in the command that is not free, and
		/// flipping modes back and forth while hunting a value is the obvious way to use it.</summary>
		public static void SetMode(GhostTraderPatch.BodyOpacityMode _mode, string _prefix)
		{
			bool changed = GhostTraderPatch.BodyMode != _mode;
			GhostTraderPatch.BodyMode = _mode;
			int rebuilt = changed ? GhostTraderPatch.Reapply() : 0;
			Report(_prefix);
			if (changed && rebuilt > 0)
			{
				SingletonMonoBehaviour<SdtdConsole>.Instance.Output(
					"  (" + rebuilt + " renderer(s) rebuilt from their original materials)");
			}
		}

		/// <summary>Current value plus what it actually reached, in both units, and which way the
		/// body is being faded. The count is the half that answers "did it do anything": 0
		/// materials means no trader has been converted yet - they stream in on approach - not
		/// that the number was refused.</summary>
		public static void Report(string _prefix)
		{
			float alpha = GhostTraderPatch.GhostAlpha;
			int applied = GhostTraderPatch.Retint();
			SingletonMonoBehaviour<SdtdConsole>.Instance.Output(
				_prefix + ": " + ((1f - alpha) * 100f).ToString("0.#") + "% transparent (alpha " +
				alpha.ToString("0.###") + "), body mode " + GhostTraderPatch.BodyMode +
				", applied to " + applied + " live material(s) across " +
				GhostTraderPatch.Ghosted.Count + " trader(s) converted this session.");
		}

		/// <summary>Percent out of what the user typed. StringParsers is the game's own parser and
		/// is culture-independent, which matters here - but it reads ',' as a THOUSANDS separator,
		/// so on a keyboard where the decimal key produces a comma "12,5" would silently parse as
		/// 125 and the trader would vanish. The comma is turned into a point before it gets there.
		/// A trailing '%' is accepted because it is the obvious thing to type.</summary>
		public static bool TryParsePercent(string _argument, out float _percent)
		{
			string text = _argument.Replace(',', '.').TrimEnd('%').Trim();
			return StringParsers.TryParseFloat(text, out _percent);
		}
	}
}