using System;
using System.Collections.Generic;
using System.Linq;
using LuckerGame.Enums;
using LuckerGame.Events;
using Sandbox;
using Sandbox.UI;

namespace LuckerGame.Entities;

/// <summary>
/// Manages rounds. Starting, stopping, triggering minigames from the manager, etc
/// </summary>
public partial class RoundManager : Entity
{
	/// <summary>
	/// The minigame manager we should be using to manage minigames
	/// </summary>
	private MinigameManager MinigameManager { get; set; }

	/// <summary>
	/// This percentage of the lobby must be ready to start the countdown for round start
	/// </summary>
	private const float RequiredReadyPercent = .5f;

	/// <summary>
	/// The number of seconds from the timer starting before the round starts
	/// </summary>
	private const float RoundStartCountdownSeconds = 5f;

	/// <summary>
	/// The state of the current round
	/// </summary>
	[Net] public RoundState RoundState { get; private set; }

	#region Countdown State
	/// <summary>
	/// How long since we started counting down to game start. Only useful if in the StartCountdown state.
	/// </summary>
	[Net] public TimeSince TimeSinceCountdownStarted { get; set; }

	/// <summary>
	/// The number of seconds left in the countdown. Only useful if in the StartCountdown state.
	/// </summary>
	public int SecondsLeftInCountdown => (int)Math.Ceiling( RoundStartCountdownSeconds - TimeSinceCountdownStarted );
	#endregion

	#region In Progress State

	/// <summary>
	/// The number of minigames that should be played per round, settable via a convar
	/// </summary>
	[ConVar.Replicated("lucker_minigames_per_round")]
	private static int MinigamesPerRound { get; set; }

	/// <summary>
	/// The number of minigames left in the current round
	/// </summary>
	public int MinigamesLeftInRound { get; set; }

	/// <summary>
	/// The luckers playing in the current round
	/// </summary>
	private List<Lucker> Luckers { get; set; }
	#endregion

	/// <inheritdoc/>
	public override void Spawn()
	{
		base.Spawn();
		RoundState = RoundState.NotStarted;
		MinigameManager = new MinigameManager();
	}

	/// <summary>
	/// Fires once per server tick
	/// </summary>
	[GameEvent.Tick.Server]
	public void Tick()
	{
		if ( RoundState == RoundState.StartCountdown && TimeSinceCountdownStarted > RoundStartCountdownSeconds )
		{
			Log.Info( "Starting round" );
			StartRound();
		}

		if ( RoundState == RoundState.InProgress )
		{
			var ended = MinigameManager.Tick();
			if ( ended )
			{
				MinigamesLeftInRound--;
				if ( MinigamesLeftInRound > 0 )
				{
					MinigameManager.StartMinigame( Luckers );
				}
				else
				{
					RoundState = RoundState.NotStarted;
				}
			}
		}
	}

	/// <summary>
	/// Is triggered whenever a lucker readies up or readies down
	/// </summary>
	/// <param name="readyLucker">the lucker that readied up</param>
	/// <param name="ready">the lucker's ready state</param>
	[LuckerEvent.LuckerReady]
	public void HandleLuckerReady( Lucker readyLucker, bool ready )
	{
		if ( RoundState != RoundState.NotStarted && RoundState != RoundState.StartCountdown )
		{
			return;
		}
		Log.Info( $"{readyLucker.Client.Name} set ready to {ready}" );
		var message = $"{readyLucker.Client.Name} is {(ready ? "now ready." : "no longer ready.")}";
		ChatBox.AddInformation( To.Everyone, message );
		var luckers = All.OfType<Lucker>().ToList();
		var readiedCount = luckers.Count( lucker => lucker.Ready );
		var totalCount = luckers.Count;
		if ( (float)readiedCount / totalCount > RequiredReadyPercent && RoundState == RoundState.NotStarted )
		{
			Log.Info( "Countdown started" );
			RoundState = RoundState.StartCountdown;
			TimeSinceCountdownStarted = 0;
		}
		else if ( (float)readiedCount / totalCount <= RequiredReadyPercent && RoundState == RoundState.StartCountdown )
		{
			Log.Info( "Countdown ended" );
			RoundState = RoundState.NotStarted;
		}
	}

	private void StartRound( string minigameName = null )
	{
		if ( RoundState == RoundState.InProgress )
		{
			Log.Warning( "Attempted to start round while one was in progress" );
			return;
		}

		RoundState = RoundState.InProgress;
		Luckers = All.OfType<Lucker>().ToList();
		Luckers.ForEach( lucker =>
		{
			lucker.Ready = false;
		} );
		MinigamesLeftInRound = MinigamesPerRound;
		MinigameManager.StartMinigame( Luckers, minigameName );
	}

	[ConCmd.Server( "start_round" )]
	public static void ForceStart( string minigameName = null )
	{
		Entity.All.OfType<RoundManager>().FirstOrDefault()?.StartRound( minigameName );
	}
}