using UnityEngine;

namespace MazeGen
{
    /// <summary>
    /// Right-side panel showing detailed info about the followed agent:
    /// - Vitals (room, HP, stats, equipment)
    /// - Inventory listing (equipped + unequipped items)
    /// - Decision narration (newest first)
    /// - Global combat log
    /// </summary>
    public class InfoPanelUI
    {
        private Vector2 thoughtScroll;
        private Vector2 combatLogScroll;
        private CombatDirector director;

        public InfoPanelUI(CombatDirector combatDirector)
        {
            director = combatDirector;
        }

        public void Draw(MazeAgent followedAgent)
        {
            float width = 400f;
            float x = Screen.width - width - 10f;
            float height = Screen.height - 20f;

            GUILayout.BeginArea(new Rect(x, 10f, width, height), GUI.skin.box);

            if (followedAgent == null)
            {
                GUILayout.Label("AGENT THOUGHTS AND INFO", GUI.skin.box);
                GUILayout.Label("Click an agent on the left to follow it and read what it's thinking.");
            }
            else
            {
                DrawAgentInfo(followedAgent, height, Color.white);
            }

            GUILayout.EndArea();
        }

        private void DrawAgentInfo(MazeAgent agent, float panelHeight, Color agentColor)
        {
            CharacterSheet sheet = agent.CharacterSheet;

            GUI.color = agentColor;
            GUILayout.Label($"{agent.DisplayName.ToUpperInvariant()} - {DescribeStatus(agent)}", GUI.skin.box);
            GUI.color = Color.white;

            // Vitals
            GUILayout.Label($"Room {agent.CurrentRoom?.Id.ToString() ?? "?"}   New rooms seen: {agent.NewRoomsVisited}   Path: {agent.PathHistory.Count} hop(s)");
            GUILayout.Label($"HP {sheet.Stats.CurrentHealth:0.#}/{sheet.Stats.MaxHealth:0.#}   ATK {sheet.GetEffectiveAttack():0.#}   DEF {sheet.GetEffectiveDefense():0.#}   SPD {sheet.GetEffectiveSpeed():0.#}");
            GUILayout.Label($"Weapon: {sheet.EquippedWeapon?.ItemName ?? "none"}   Armor: {sheet.EquippedArmor?.ItemName ?? "none"}");

            // Threat assessment for current room
            Room room = agent.CurrentRoom;
            int hostiles = room?.Encounter != null ? room.Encounter.AliveMonsterCount : 0;
            GUILayout.Label(hostiles > 0
                ? $"This room: {hostiles} living hostile(s), threat {room.Encounter.GetPerceivedChallengeRating(sheet):0.00}"
                : "This room: clear");

            // Inventory listing
            GUILayout.Space(4);
            DrawInventory(sheet);

            GUILayout.Space(4);
            GUILayout.Label("Thoughts (newest first):");
            thoughtScroll = GUILayout.BeginScrollView(thoughtScroll, GUILayout.Height(Mathf.Max(80f, panelHeight * 0.30f)));
            var thoughts = agent.Thoughts.Entries;
            for (int i = thoughts.Count - 1; i >= 0; i--)
            {
                Thought thought = thoughts[i];
                GUI.color = AgentThoughtLog.ColorFor(thought.Kind);
                GUILayout.Label($"[{thought.Time:0.0}s] {thought.Text}");
            }
            GUI.color = Color.white;
            GUILayout.EndScrollView();

            GUILayout.Space(4);
            GUILayout.Label("Combat log (all fights):");
            combatLogScroll = GUILayout.BeginScrollView(combatLogScroll, GUILayout.Height(Mathf.Max(100f, panelHeight * 0.25f)));
            var log = director.CombatLog;
            for (int i = log.Count - 1; i >= 0; i--)
                GUILayout.Label(log[i]);
            GUILayout.EndScrollView();
        }

        private void DrawInventory(CharacterSheet sheet)
        {
            GUILayout.Label("Inventory:", GUI.skin.box);

            if (sheet.Inventory.Count == 0)
            {
                GUILayout.Label("(Empty)");
                return;
            }

            foreach (var item in sheet.Inventory)
            {
                string itemType = item is Consumable ? "[Consumable]" : item is Weapon ? "[Weapon]" : "[Item]";
                string details = "";

                if (item is Consumable cons)
                {
                    if (cons.HealthBonus > 0)
                        details = $" +{cons.HealthBonus:0.#} HP";
                }
                else if (item is Weapon weap)
                {
                    details = $" (ATK +{weap.AttackBonus:0.#})";
                }
                else if (item is Armor armor)
                {
                    details = $" (DEF +{armor.DefenseBonus:0.#})";
                }

                GUI.color = new Color(0.7f, 0.85f, 1f);
                GUILayout.Label($"  {itemType} {item.ItemName}{details}");
            }
            GUI.color = Color.white;
        }

        private string DescribeStatus(MazeAgent agent)
        {
            if (agent.IsDead) return "dead";
            if (agent.IsFinished) return "reached exit";
            if (agent.IsEngaged) return "fighting";
            return $"exploring ({agent.CharacterSheet.Stats.CurrentHealth:0}hp)";
        }
    }
}