using System.Collections.Generic;
using System.Linq;
using UnityEngine;

namespace MazeGen
{
    /// <summary>
    /// Displays live fights: join-window countdown timer, participant list, and controls
    /// to watch or simulate each fight. Drawn centre-top so a paused fight is impossible to miss.
    /// </summary>
    public class FightPanelUI
    {
        private Vector2 scrollPosition;
        private CombatDirector director;
        private MazeCameraController cameraController;

        public FightPanelUI(CombatDirector combatDirector, MazeCameraController camera)
        {
            director = combatDirector;
            cameraController = camera;
        }

        public void Draw()
        {
            var fights = director.ActiveFights;
            if (fights.Count == 0) return;

            float width = Mathf.Min(460f, Mathf.Max(280f, Screen.width - 720f));
            GUILayout.BeginArea(new Rect(300f, 10f, width, Screen.height - 20f), GUI.skin.box);

            GUILayout.Label($"FIGHTS BREAKING OUT ({fights.Count})", GUI.skin.box);

            // The "resume" button stays outside the scroll view so it's always reachable even
            // when there are more fights than fit on screen at once.
            scrollPosition = GUILayout.BeginScrollView(scrollPosition);

            // Snapshot: resuming from this panel can resolve/cancel a fight, mutating the live list.
            foreach (var fight in fights.ToArray())
            {
                GUILayout.BeginVertical(GUI.skin.box);
                GUILayout.Label($"#{fight.Id} in room {fight.Room.Id} - {fight.Agents.Count} agent(s) vs {fight.Encounter.AliveMonsterCount} monster(s)");
                GUILayout.Label($"Starts in {Mathf.Max(0f, fight.JoinTimeRemaining):0.0}s - {(SimulationClock.IsPaused ? "frozen; resume to let the timer run out" : "others can still join")}");
                GUILayout.Label($"In: {string.Join(", ", fight.Agents.Select(a => a.DisplayName))}");

                // These only set a preference for when the join window naturally expires - they
                // never skip the timer, so late arrivals always get their full chance to join.
                CombatViewMode preferred = fight.PreferredResolution ?? director.TimeoutResolution;
                GUILayout.Label($"When it starts: {(preferred == CombatViewMode.Watch ? "watch it" : "log only")}");

                GUILayout.BeginHorizontal();
                GUI.enabled = preferred != CombatViewMode.Watch;
                if (GUILayout.Button("Watch it"))
                    director.PreferWatch(fight);
                GUI.enabled = preferred != CombatViewMode.Simulate;
                if (GUILayout.Button("Log only"))
                    director.PreferSimulate(fight);
                GUI.enabled = true;
                if (GUILayout.Button("Go to"))
                    cameraController?.FocusOn(fight.Room.Position);
                GUILayout.EndHorizontal();
                GUILayout.EndVertical();
            }

            GUILayout.EndScrollView();

            if (SimulationClock.IsPaused && GUILayout.Button("Resume - let the join window run"))
            {
                director.ResumeAllMusters();
                SimulationClock.UserPaused = false;
            }

            GUILayout.EndArea();
        }
    }
}