using System;
using OTGIntegrated.Abilities;
using OTGIntegrated.Core;
using OTGIntegrated.Quests;
using OTGIntegrated.Stats;
using OTGIntegrated.Weapons;
using UnityEngine;
using UnityEngine.UI;

namespace OTGIntegrated.UI
{
    [Serializable]
    public sealed class AbilityHudSlot
    {
        public Text keyText;
        public Text nameText;
        public Text manaText;
        public Text cooldownText;
        public Image cooldownOverlay;
        public Image iconImage;
    }

    public sealed class HUDController : MonoBehaviour
    {
        [Header("Status")]
        public Image hpFill;
        public Image manaFill;
        public Image expFill;
        public Text hpText;
        public Text manaText;
        public Text expText;
        public Text levelText;

        [Header("Quest")]
        public Text questTitleText;
        public Text questBodyText;

        [Header("Abilities")]
        public AbilityHudSlot[] abilitySlots = new AbilityHudSlot[3];

        [Header("Weapon")]
        public Text weaponNameText;
        public Text weaponDamageText;
        public Text weaponHintText;

        private PlayerStats stats;
        private LevelSystem levelSystem;
        private QuestManager questManager;
        private AbilityManager abilityManager;
        private WeaponManager weaponManager;

        public void Initialize(PlayerStats stats, LevelSystem levelSystem, QuestManager questManager, AbilityManager abilityManager, WeaponManager weaponManager)
        {
            this.stats = stats;
            this.levelSystem = levelSystem;
            this.questManager = questManager;
            this.abilityManager = abilityManager;
            this.weaponManager = weaponManager;

            if (stats != null) stats.OnStatsChanged += RefreshAll;
            if (levelSystem != null)
            {
                levelSystem.OnExperienceChanged += RefreshAll;
                levelSystem.OnLevelChanged += RefreshAll;
            }

            if (questManager != null) questManager.OnQuestsChanged += RefreshAll;
            if (abilityManager != null) abilityManager.OnAbilitiesChanged += RefreshAbilities;

            GameEvents.OnWeaponChanged += _ => RefreshWeapon();
            GameEvents.OnStatsChanged += RefreshAll;
            RefreshAll();
        }

        private void OnDestroy()
        {
            if (stats != null) stats.OnStatsChanged -= RefreshAll;
            if (levelSystem != null)
            {
                levelSystem.OnExperienceChanged -= RefreshAll;
                levelSystem.OnLevelChanged -= RefreshAll;
            }

            if (questManager != null) questManager.OnQuestsChanged -= RefreshAll;
            if (abilityManager != null) abilityManager.OnAbilitiesChanged -= RefreshAbilities;
            GameEvents.OnStatsChanged -= RefreshAll;
        }

        private void Update()
        {
            RefreshAbilities();
        }

        public void RefreshAll()
        {
            RefreshStatus();
            RefreshQuest();
            RefreshAbilities();
            RefreshWeapon();
        }

        private void RefreshStatus()
        {
            if (stats != null)
            {
                if (hpFill != null) hpFill.fillAmount = stats.GetNormalizedHealth();
                if (manaFill != null) manaFill.fillAmount = stats.GetNormalizedMana();
                if (hpText != null) hpText.text = $"HP {Mathf.RoundToInt(stats.CurrentHealth)} / {Mathf.RoundToInt(stats.MaxHealth)}";
                if (manaText != null) manaText.text = $"Mana {Mathf.RoundToInt(stats.CurrentMana)} / {Mathf.RoundToInt(stats.MaxMana)}";
            }

            if (levelSystem != null)
            {
                if (expFill != null) expFill.fillAmount = levelSystem.GetNormalizedExp();
                if (expText != null) expText.text = $"EXP {levelSystem.currentExp} / {levelSystem.expToNextLevel}";
                if (levelText != null) levelText.text = $"Level {levelSystem.level}";
            }
        }

        private void RefreshQuest()
        {
            if (questTitleText != null)
            {
                questTitleText.text = "Активная цель";
            }

            if (questBodyText != null)
            {
                questBodyText.text = questManager != null ? questManager.GetPrimaryTrackerText() : "Нет активных квестов";
            }
        }

        private void RefreshAbilities()
        {
            if (abilityManager == null || abilitySlots == null)
            {
                return;
            }

            for (int i = 0; i < abilitySlots.Length; i++)
            {
                AbilityHudSlot slot = abilitySlots[i];
                if (slot == null)
                {
                    continue;
                }

                AbilityData ability = i < abilityManager.LearnedAbilities.Count ? abilityManager.LearnedAbilities[i] : null;
                float remaining = abilityManager.GetCooldownRemaining(i);
                if (slot.keyText != null) slot.keyText.text = (i + 1).ToString();
                if (slot.nameText != null) slot.nameText.text = ability != null ? ability.displayName : "-";
                if (slot.manaText != null) slot.manaText.text = ability != null ? Mathf.RoundToInt(ability.manaCost).ToString() : string.Empty;
                if (slot.cooldownOverlay != null) slot.cooldownOverlay.fillAmount = abilityManager.GetCooldownNormalized(i);
                if (slot.cooldownText != null) slot.cooldownText.text = remaining > 0.05f ? remaining.ToString("0.0") : string.Empty;
                if (slot.iconImage != null)
                {
                    slot.iconImage.sprite = ability != null ? ability.icon : null;
                    slot.iconImage.color = ability != null && ability.icon != null ? Color.white : new Color(0.2f, 0.22f, 0.26f, 1f);
                }
            }
        }

        private void RefreshWeapon()
        {
            WeaponData weapon = weaponManager != null ? weaponManager.CurrentWeapon : null;
            if (weaponNameText != null) weaponNameText.text = weapon != null ? $"Weapon: {weapon.displayName}" : "Weapon: -";
            if (weaponDamageText != null) weaponDamageText.text = weaponManager != null ? $"Damage: {weaponManager.CurrentFinalDamage:0}" : "Damage: -";
            if (weaponHintText != null) weaponHintText.text = "LMB — Attack";
        }
    }
}