using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using Luneraria.Core;
using NUnit.Framework;
using UnityEngine;
using UnityEngine.TestTools;

namespace Luneraria.UI.Tests
{
    /// <summary>
    /// Interactive playtest of the real game (port of tools/luneraria/g3_playtest.gd). It never
    /// touches the match state: every action is an input a player gives, at pixel coordinates of
    /// the 1920×1080 picture (origin top left). A click reaches the HUD panel as pointer events
    /// and the field as LuneGame.ClickField, which ignores points on the HUD, because in the
    /// player both see the same mouse; game keys go through LuneGame.Key, the camera keys R, Q,
    /// E and O through the rig as in its own key handling. Pointer moves give hover (tooltips).
    /// A tester writes command batches and gets a screenshot back after each batch:
    ///   /tmp/lune_play/cmd-N.txt   lines: click X Y · move X Y · key NAME · wait SECONDS · shot NAME · quit
    ///   /tmp/lune_play/out-N.png   the screen after the batch; /tmp/lune_play/ok-N holds round and phase
    /// The log of all commands with round and phase goes to docs/port/logs/u3/playtest-log.txt.
    /// There is no main menu in the port yet, so the playtest starts in the match of the G1 scene
    /// (seed of the scene, 2; LUNE_PLAYTEST_SEED overrides). It ends with quit or after 30 idle minutes.
    /// Run: -testFilter "Luneraria.UI.Tests.HudPlaytest".
    /// </summary>
    [Explicit("Spieltest: wartet auf Befehlsdateien")]
    public sealed class HudPlaytest
    {
        const string Dir = "/tmp/lune_play/";
        const string LogFile = "docs/port/logs/u3/playtest-log.txt";

        HudSession _s;
        readonly List<string> _log = new List<string>();
        float _started;
        bool _quit;

        [UnityTest, Timeout(int.MaxValue)]
        public IEnumerator Play()
        {
            Directory.CreateDirectory(Dir);
            foreach (string file in Directory.GetFiles(Dir))
                File.Delete(file);
            int seed = int.TryParse(Environment.GetEnvironmentVariable("LUNE_PLAYTEST_SEED"), out int value) ? value : 2;
            _s = new HudSession();
            yield return _s.Open(1920, 1080, seed: seed);
            _started = Time.realtimeSinceStartup;
            yield return new WaitForSecondsRealtime(.5f);
            _s.Capture(Dir + "out-0.png");
            File.WriteAllText(Dir + "ok-0", Status());
            int next = 1;
            float idle = 0f;
            while (!_quit && idle < 1800f)
            {
                string path = Dir + "cmd-" + next + ".txt";
                if (!File.Exists(path))
                {
                    idle += Time.unscaledDeltaTime;
                    yield return null;
                    continue;
                }
                idle = 0f;
                foreach (string raw in File.ReadAllLines(path))
                {
                    string line = raw.Trim();
                    if (line.Length == 0 || line.StartsWith("#", StringComparison.Ordinal))
                        continue;
                    Write(next, line);
                    yield return Command(line.Split(new[] { ' ' }, StringSplitOptions.RemoveEmptyEntries));
                    if (_quit)
                        break;
                }
                yield return new WaitForSecondsRealtime(.35f);
                _s.Capture(Dir + "out-" + next + ".png");
                File.WriteAllText(Dir + "ok-" + next, Status());
                next++;
            }
            _s.Close();
            Assert.IsTrue(_quit, "the playtest ended with quit");
        }

        string Status()
        {
            LuneMatch match = _s.Match;
            string phase = match.Phase == Phase.Planning ? "PLANUNG" : match.Phase == Phase.Combat ? "KAMPF" : "ENDE";
            return "round=" + match.RoundNumber + " phase=" + phase;
        }

        void Write(int index, string line)
        {
            _log.Add(string.Format(CultureInfo.InvariantCulture, "{0,7:0.0} s  #{1}  [{2}]  {3}", Time.realtimeSinceStartup - _started, index, Status(), line));
            string file = Path.Combine(HudSession.Root, LogFile);
            Directory.CreateDirectory(Path.GetDirectoryName(file));
            File.WriteAllText(file, string.Join("\n", _log) + "\n");
        }

        IEnumerator Command(string[] parts)
        {
            switch (parts[0])
            {
                case "click":
                {
                    Vector2 pixel = Pixel(parts);
                    Vector2 at = _s.Hud.PixelToPanel(pixel);
                    _s.MoveTo(at);
                    yield return null;
                    _s.Pointer(at, EventType.MouseDown);
                    // The field sees the same press (LuneGame.HandleClicks); it ignores points on the HUD.
                    _s.Game.ClickField(new Vector2(pixel.x, _s.Height - pixel.y));
                    yield return null;
                    _s.Pointer(at, EventType.MouseUp);
                    yield return null;
                    break;
                }
                case "move":
                    _s.MoveTo(_s.Hud.PixelToPanel(Pixel(parts)));
                    yield return null;
                    break;
                case "key":
                    Key(parts[1].ToUpperInvariant());
                    yield return null;
                    break;
                case "wait":
                    yield return new WaitForSecondsRealtime(float.Parse(parts[1], CultureInfo.InvariantCulture));
                    break;
                case "shot":
                    yield return null;
                    _s.Capture(Dir + parts[1] + ".png");
                    break;
                case "quit":
                    _quit = true;
                    break;
                default:
                    Debug.LogWarning("LUNE_PLAYTEST unknown command: " + string.Join(" ", parts));
                    break;
            }
        }

        static Vector2 Pixel(string[] parts)
        {
            return new Vector2(float.Parse(parts[1], CultureInfo.InvariantCulture), float.Parse(parts[2], CultureInfo.InvariantCulture));
        }

        void Key(string name)
        {
            // Camera keys of the rig (LuneCameraRig.HandleInput), blocked while the options are open.
            if (name == "R" || name == "Q" || name == "E" || name == "O")
            {
                if (_s.Hud.Settings.Open)
                    return;
                if (name == "R")
                    _s.Rig.ResetRequested?.Invoke();
                else if (name == "O")
                    _s.Rig.Overview();
                else
                    _s.Rig.RotateStep(name == "Q" ? -1 : 1);
                return;
            }
            KeyCode code;
            if (name.Length == 1 && char.IsDigit(name[0]))
                code = KeyCode.Alpha0 + (name[0] - '0');
            else if (name == "ESC")
                code = KeyCode.Escape;
            else
                code = (KeyCode)Enum.Parse(typeof(KeyCode), name, true);
            _s.Game.Key(code);
        }
    }
}