using System;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Munga.Net;

namespace VPod;

/// <summary>
/// The vPOD window: a live view of the simulated pod. Top panel shows the
/// listening/connection status and the current ApplicationState (colour-coded),
/// with the game toggle (Red Planet / BattleTech) that changes which
/// ApplicationID the pod reports. Below, the left pane is the egg viewer (the
/// last egg the console streamed, one field per line) and the right pane is a
/// scrolling protocol log.
/// </summary>
internal sealed class VPodForm : Form
{
	private readonly PodArguments mOptions;
	private readonly MungaPodServer mServer;
	private readonly PodSimulator mSimulator;

	private Label mListeningLabel;
	private Label mConnectionLabel;
	private Label mStateLabel;
	private Label mEggSummaryLabel;
	private RadioButton mRedPlanetRadio;
	private RadioButton mBattleTechRadio;
	private Button mPowerButton;
	private Button mResetButton;
	private TextBox mEggBox;
	private TextBox mLogBox;

	public VPodForm(PodArguments options)
	{
		mOptions = options;
		mServer = new MungaPodServer(options.Port);
		mSimulator = new PodSimulator(mServer, options.Application, options.HostId);
		BuildUi();

		mServer.Log += OnLog;
		mServer.ConnectionChanged += OnConnectionChanged;
		mServer.MessageReceived += OnMessageReceived;
		mSimulator.Log += OnLog;
		mSimulator.StateChanged += OnStateChanged;
		mSimulator.EggReceived += OnEggReceived;
		mSimulator.EggProgress += OnEggProgress;

		Load += OnFormLoad;
		FormClosing += OnFormClosing;
	}

	private void BuildUi()
	{
		Text = $"vPOD - virtual pod (port {mOptions.Port}, host {mOptions.HostId})";
		ClientSize = new Size(920, 560);
		MinimumSize = new Size(760, 460);
		Font = new Font("Segoe UI", 9f);

		// ---- status panel ----
		GroupBox statusGroup = new GroupBox
		{
			Text = "Pod Status",
			Dock = DockStyle.Top,
			Height = 168,
			Padding = new Padding(10)
		};

		mListeningLabel = new Label { AutoSize = true, Location = new Point(16, 26) };
		mConnectionLabel = new Label { AutoSize = true, Location = new Point(16, 50) };

		Label roleLabel = new Label
		{
			AutoSize = true,
			Location = new Point(16, 74),
			Text = "Role: " + RoleText(mOptions.HostType)
		};

		Label stateCaption = new Label
		{
			AutoSize = true,
			Location = new Point(16, 106),
			Text = "Application State:"
		};
		mStateLabel = new Label
		{
			AutoSize = true,
			Location = new Point(130, 100),
			Font = new Font("Segoe UI", 15f, FontStyle.Bold),
			Text = "—"
		};

		// game toggle
		GroupBox gameGroup = new GroupBox
		{
			Text = "Mimicking Game",
			Location = new Point(560, 20),
			Size = new Size(330, 130)
		};
		mRedPlanetRadio = new RadioButton
		{
			Text = "Red Planet  (RPL4)",
			Location = new Point(18, 28),
			AutoSize = true,
			Checked = mOptions.Application == ApplicationID.RPL4
		};
		mBattleTechRadio = new RadioButton
		{
			Text = "BattleTech  (BTL4)",
			Location = new Point(18, 56),
			AutoSize = true,
			Checked = mOptions.Application == ApplicationID.BTL4
		};
		mRedPlanetRadio.CheckedChanged += GameToggleChanged;
		mBattleTechRadio.CheckedChanged += GameToggleChanged;
		mPowerButton = new Button { Text = "Power On", Location = new Point(18, 88), Size = new Size(90, 28) };
		mResetButton = new Button { Text = "Reset", Location = new Point(116, 88), Size = new Size(90, 28) };
		mPowerButton.Click += (s, e) => mSimulator.PowerOn();
		mResetButton.Click += (s, e) => mSimulator.Reset();
		gameGroup.Controls.Add(mRedPlanetRadio);
		gameGroup.Controls.Add(mBattleTechRadio);
		gameGroup.Controls.Add(mPowerButton);
		gameGroup.Controls.Add(mResetButton);

		statusGroup.Controls.Add(mListeningLabel);
		statusGroup.Controls.Add(mConnectionLabel);
		statusGroup.Controls.Add(roleLabel);
		statusGroup.Controls.Add(stateCaption);
		statusGroup.Controls.Add(mStateLabel);
		statusGroup.Controls.Add(gameGroup);

		// ---- egg viewer + log ----
		SplitContainer split = new SplitContainer
		{
			Dock = DockStyle.Fill,
			SplitterDistance = 480,
			Orientation = Orientation.Vertical
		};

		GroupBox eggGroup = new GroupBox { Text = "Current Egg", Dock = DockStyle.Fill, Padding = new Padding(8) };
		mEggSummaryLabel = new Label { Dock = DockStyle.Top, Height = 40, Text = "No egg loaded." };
		mEggBox = new TextBox
		{
			Dock = DockStyle.Fill,
			Multiline = true,
			ReadOnly = true,
			ScrollBars = ScrollBars.Both,
			WordWrap = false,
			Font = new Font("Consolas", 9f),
			BackColor = Color.White
		};
		eggGroup.Controls.Add(mEggBox);
		eggGroup.Controls.Add(mEggSummaryLabel);

		GroupBox logGroup = new GroupBox { Text = "Protocol Log", Dock = DockStyle.Fill, Padding = new Padding(8) };
		mLogBox = new TextBox
		{
			Dock = DockStyle.Fill,
			Multiline = true,
			ReadOnly = true,
			ScrollBars = ScrollBars.Both,
			WordWrap = false,
			Font = new Font("Consolas", 9f),
			BackColor = Color.FromArgb(24, 24, 24),
			ForeColor = Color.Gainsboro
		};
		logGroup.Controls.Add(mLogBox);

		split.Panel1.Controls.Add(eggGroup);
		split.Panel2.Controls.Add(logGroup);

		Controls.Add(split);
		Controls.Add(statusGroup);
	}

	private void OnFormLoad(object sender, EventArgs e)
	{
		UpdateListeningLabel(false);
		UpdateConnectionLabel(null);
		UpdateStateLabel(mSimulator.State);
		try
		{
			mServer.Start();
			UpdateListeningLabel(true);
			mSimulator.PowerOn();
		}
		catch (Exception ex)
		{
			UpdateListeningLabel(false);
			OnLog("FAILED to listen on port " + mOptions.Port + ": " + ex.Message);
			MessageBox.Show(this,
				"Could not listen on TCP port " + mOptions.Port + ".\n\n" + ex.Message +
				"\n\nIs another pod or vPOD already using it?",
				"vPOD", MessageBoxButtons.OK, MessageBoxIcon.Warning);
		}
	}

	private void OnFormClosing(object sender, FormClosingEventArgs e)
	{
		mServer.Stop();
	}

	private void GameToggleChanged(object sender, EventArgs e)
	{
		if (sender is RadioButton rb && !rb.Checked)
		{
			return; // only act on the newly-checked one
		}
		mSimulator.ApplicationId = mBattleTechRadio.Checked ? ApplicationID.BTL4 : ApplicationID.RPL4;
	}

	// ---- event handlers (marshal to UI thread) ----

	private const int MaxLogLines = 500;

	private void OnLog(string message)
	{
		if (IsDisposed) return;
		BeginInvoke((Action)(() =>
		{
			// Newest first: prepend, and cap the buffer so it can't grow without bound.
			string line = $"[{DateTime.Now:HH:mm:ss}] {message}";
			string existing = mLogBox.Text;
			string combined = existing.Length > 0 ? line + "\r\n" + existing : line;
			string[] lines = combined.Split(new[] { "\r\n" }, StringSplitOptions.None);
			if (lines.Length > MaxLogLines)
			{
				combined = string.Join("\r\n", lines, 0, MaxLogLines);
			}
			mLogBox.Text = combined;
		}));
	}

	private void OnConnectionChanged(string remote)
	{
		if (IsDisposed) return;
		BeginInvoke((Action)(() => UpdateConnectionLabel(remote)));
	}

	private void OnMessageReceived(MungaPodServer.Incoming incoming)
	{
		// The simulator drives all protocol behaviour; the UI only logs
		// non-query traffic (StateQuery is once-a-second noise).
		if (!(incoming.Message is StateQueryMessage) && incoming.Message != null)
		{
			OnLog("<- " + incoming.Message.GetType().Name);
		}
		mSimulator.HandleMessage(incoming);
	}

	private void OnStateChanged(ApplicationState state)
	{
		if (IsDisposed) return;
		BeginInvoke((Action)(() => UpdateStateLabel(state)));
	}

	private void OnEggReceived(string eggText)
	{
		if (IsDisposed) return;
		BeginInvoke((Action)(() =>
		{
			mEggBox.Text = eggText.Replace("\n", "\r\n");
			mEggSummaryLabel.Text = SummarizeEgg(eggText);
		}));
	}

	private void OnEggProgress()
	{
		if (IsDisposed) return;
		BeginInvoke((Action)(() =>
		{
			int pct = mSimulator.EggPercent;
			if (pct < 100 && pct > 0)
			{
				mEggSummaryLabel.Text = $"Receiving egg... {pct}%";
			}
		}));
	}

	// ---- label helpers ----

	private void UpdateListeningLabel(bool listening)
	{
		mListeningLabel.Text = listening
			? $"Listening on TCP {mOptions.Port} ●"
			: $"Not listening on TCP {mOptions.Port}";
		mListeningLabel.ForeColor = listening ? Color.ForestGreen : Color.Firebrick;
	}

	private void UpdateConnectionLabel(string remote)
	{
		if (string.IsNullOrEmpty(remote))
		{
			mConnectionLabel.Text = "Console: not connected";
			mConnectionLabel.ForeColor = Color.Gray;
		}
		else
		{
			mConnectionLabel.Text = "Console: connected from " + remote;
			mConnectionLabel.ForeColor = Color.ForestGreen;
		}
	}

	private void UpdateStateLabel(ApplicationState state)
	{
		mStateLabel.Text = Prettify(state);
		mStateLabel.ForeColor = ColorFor(state);
	}

	private static string RoleText(HostType hostType)
	{
		switch (hostType)
		{
		case HostType.MissionReviewHostType:
			return "Camera / Mission Review";
		case HostType.ConsoleHostType:
			return "Console";
		default:
			return "Game Machine (player)";
		}
	}

	private static string Prettify(ApplicationState state)
	{
		switch (state)
		{
		case ApplicationState.InitializingState: return "Initializing";
		case ApplicationState.WaitingForEgg: return "Waiting For Egg";
		case ApplicationState.LoadingMission: return "Loading Mission";
		case ApplicationState.WaitingForLaunch: return "Waiting For Launch";
		case ApplicationState.LaunchingMission: return "Launching Mission";
		case ApplicationState.RunningMission: return "Running Mission";
		case ApplicationState.EndingMission: return "Ending Mission";
		case ApplicationState.StoppingMission: return "Stopping Mission";
		case ApplicationState.SuspendingMission: return "Suspended";
		case ApplicationState.ResumingMission: return "Resuming Mission";
		case ApplicationState.AbortingMission: return "Aborting Mission";
		case ApplicationState.CreatingMission: return "Creating Mission";
		default: return state.ToString();
		}
	}

	private static Color ColorFor(ApplicationState state)
	{
		switch (state)
		{
		case ApplicationState.WaitingForEgg: return Color.ForestGreen;
		case ApplicationState.WaitingForLaunch: return Color.DarkGoldenrod;
		case ApplicationState.RunningMission: return Color.RoyalBlue;
		case ApplicationState.InitializingState: return Color.Gray;
		default: return Color.DarkOrange;
		}
	}

	private static string SummarizeEgg(string eggText)
	{
		string adventure = null, map = null, scenario = null;
		int pilots = 0;
		foreach (string raw in eggText.Split('\n'))
		{
			string line = raw.Trim();
			if (line.StartsWith("adventure=")) adventure = line.Substring(10);
			else if (line.StartsWith("map=")) map = line.Substring(4);
			else if (line.StartsWith("scenario=")) scenario = line.Substring(9);
			else if (line.StartsWith("pilot=")) pilots++;
		}
		StringBuilder sb = new StringBuilder();
		sb.Append(adventure ?? "(egg)");
		if (map != null) sb.Append("  •  map=").Append(map);
		if (scenario != null) sb.Append("  •  ").Append(scenario);
		sb.Append("  •  ").Append(pilots).Append(pilots == 1 ? " pilot" : " pilots");
		return sb.ToString();
	}
}