using System;
using UnityEngine;
using UnityEngine.UI;
using Vanguard.App;
using Vanguard.State;

namespace Vanguard.UI
{
    /// <summary>
    /// Верхняя панель игрока, общая для Lobby и DeckBuilder: аватар-инициалы,
    /// ник, MMR, сезон, Rating/Community и гамбургер-меню.
    /// </summary>
    public sealed class PlayerTopBar : IDisposable
    {
        public const string RootName = "PlayerTopBar";

        private const float Margin = 24f;
        private const float Height = 96f;

        private static readonly Color Border = new Color(0.18f, 0.49f, 1f, 0.55f);
        private static readonly Color BorderStrong = new Color(0.34f, 0.72f, 1f, 0.9f);
        private static readonly Color TextPrimary = new Color(0.88f, 0.93f, 1f);
        private static readonly Color TextMuted = new Color(0.58f, 0.69f, 0.88f);
        private static readonly Color TextDim = new Color(0.44f, 0.55f, 0.75f);
        private static readonly Color Accent = new Color(0.37f, 0.69f, 1f);

        private readonly PlayerState _player;
        private readonly HamburgerMenu _menu;
        private readonly RectTransform _root;
        private Text _avatar;
        private Text _playerName;
        private Text _mmr;
        private bool _disposed;

        public PlayerTopBar(
            Transform parent,
            AppConfig config,
            PlayerState player,
            Action onLoggedOut,
            Action onHistory,
            Action onRating,
            Action onCommunity,
            Action onLobby = null,
            Transform overlayParent = null)
        {
            _player = player;

            var top = Surface(parent, RootName, new Color(0.012f, 0.03f, 0.08f, 0.94f), 0);
            _root = top;
            top.anchorMin = new Vector2(0f, 1f);
            top.anchorMax = new Vector2(1f, 1f);
            top.pivot = new Vector2(0.5f, 1f);
            top.offsetMin = new Vector2(Margin, -Height);
            top.offsetMax = new Vector2(-Margin, 0f);

            var avatarRect = Surface(
                top,
                "Avatar",
                new Color(0.05f, 0.13f, 0.3f, 0.95f),
                14);
            avatarRect.anchorMin = new Vector2(0f, 0.5f);
            avatarRect.anchorMax = new Vector2(0f, 0.5f);
            avatarRect.pivot = new Vector2(0f, 0.5f);
            avatarRect.sizeDelta = new Vector2(64f, 64f);
            avatarRect.anchoredPosition = new Vector2(20f, 0f);

            _avatar = UiKit.CreateText(avatarRect, "Initials", "?", 26, TextPrimary);
            _avatar.fontStyle = FontStyle.Bold;
            UiKit.Stretch(_avatar.rectTransform);
            UiKit.MakeLiteral(_avatar);

            _playerName = UiKit.CreateText(
                top,
                "PlayerName",
                "…",
                22,
                TextPrimary,
                TextAnchor.MiddleLeft);
            _playerName.fontStyle = FontStyle.Bold;
            var nameRect = _playerName.rectTransform;
            nameRect.anchorMin = new Vector2(0f, 0.5f);
            nameRect.anchorMax = new Vector2(0f, 0.5f);
            nameRect.pivot = new Vector2(0f, 0.5f);
            nameRect.sizeDelta = new Vector2(420f, 30f);
            nameRect.anchoredPosition = new Vector2(104f, 14f);
            UiKit.MakeLiteral(_playerName);

            _mmr = UiKit.CreateText(
                top,
                "Mmr",
                string.Empty,
                14,
                TextMuted,
                TextAnchor.MiddleLeft);
            var mmrRect = _mmr.rectTransform;
            mmrRect.anchorMin = new Vector2(0f, 0.5f);
            mmrRect.anchorMax = new Vector2(0f, 0.5f);
            mmrRect.pivot = new Vector2(0f, 0.5f);
            mmrRect.sizeDelta = new Vector2(460f, 22f);
            mmrRect.anchoredPosition = new Vector2(104f, -16f);
            UiKit.MakeLiteral(_mmr);

            var season = UiKit.CreateText(
                top,
                "Season",
                "Сезон — скоро",
                14,
                TextDim,
                TextAnchor.MiddleCenter);
            var seasonRect = season.rectTransform;
            seasonRect.anchorMin = new Vector2(0.5f, 0.5f);
            seasonRect.anchorMax = new Vector2(0.5f, 0.5f);
            seasonRect.sizeDelta = new Vector2(280f, 30f);
            seasonRect.anchoredPosition = Vector2.zero;

            AddAction(top, "Rating", "Рейтинг", -312f, 180f, onRating, LobbyIcon.Chart);
            AddAction(top, "Community", "Сообщество", -96f, 200f, onCommunity, LobbyIcon.Friends);
            if (onLobby != null)
                AddAction(top, "ToLobby", "← В лобби", -508f, 160f, onLobby, null);

            _menu = new HamburgerMenu(
                top,
                config,
                onLoggedOut,
                onHistory,
                onLobby,
                "Меню",
                overlayParent);

            _player.Changed += UpdateTexts;
            Loc.LanguageChanged += UpdateTexts;
            UpdateTexts();
        }

        public bool IsMenuOpen => _menu != null && _menu.IsOpen;

        public RectTransform Root => _root;

        public void CloseMenu()
        {
            if (_menu != null)
                _menu.Close();
        }

        public void Dispose()
        {
            if (_disposed)
                return;

            _disposed = true;
            _player.Changed -= UpdateTexts;
            Loc.LanguageChanged -= UpdateTexts;
        }

        private void UpdateTexts()
        {
            if (_disposed)
                return;

            var name = string.IsNullOrEmpty(_player.UserName) ? "…" : _player.UserName;
            _playerName.text = name;
            _avatar.text = Initial(name);
            _mmr.text = "MMR " + _player.RankedMmr
                + "   ·   " + Loc.Translate("матчей") + " " + _player.Matches
                + "   ·   " + Loc.Translate("побед") + " " + WinsPercent();
        }

        private string WinsPercent()
        {
            if (_player.Matches <= 0)
                return "0%";

            return Mathf.RoundToInt(_player.Wins * 100f / _player.Matches) + "%";
        }

        private static string Initial(string name)
        {
            foreach (var character in name)
            {
                if (char.IsLetterOrDigit(character))
                    return char.ToUpperInvariant(character).ToString();
            }

            return "?";
        }

        private static void AddAction(
            RectTransform parent,
            string name,
            string label,
            float rightOffset,
            float width,
            Action onClick,
            Action<RectTransform, Color> icon)
        {
            var buttonRect = Surface(parent, name, new Color(0.035f, 0.09f, 0.21f, 0.85f), 12);
            buttonRect.anchorMin = new Vector2(1f, 0.5f);
            buttonRect.anchorMax = new Vector2(1f, 0.5f);
            buttonRect.pivot = new Vector2(1f, 0.5f);
            buttonRect.sizeDelta = new Vector2(width, 52f);
            buttonRect.anchoredPosition = new Vector2(rightOffset, 0f);

            var image = buttonRect.GetComponent<Image>();
            image.raycastTarget = true;
            var button = buttonRect.gameObject.AddComponent<Button>();
            button.targetGraphic = image;
            button.transition = Selectable.Transition.ColorTint;
            button.colors = HoverColors();
            if (onClick != null)
                button.onClick.AddListener(() => onClick());
            else
                button.interactable = false;

            var textLeft = 18f;
            if (icon != null)
            {
                var iconColor = onClick != null
                    ? Accent
                    : new Color(Accent.r, Accent.g, Accent.b, 0.35f);
                var iconRect = Icon(buttonRect, new Vector2(30f, 30f), new Vector2(-width * 0.5f + 30f, 0f), 0.6f);
                icon(iconRect, iconColor);
                textLeft = 52f;
            }

            var text = UiKit.CreateText(
                buttonRect,
                "Label",
                label,
                17,
                onClick != null ? TextPrimary : new Color(TextPrimary.r, TextPrimary.g, TextPrimary.b, 0.4f),
                TextAnchor.MiddleLeft);
            var textRect = text.rectTransform;
            textRect.anchorMin = new Vector2(0f, 0f);
            textRect.anchorMax = new Vector2(1f, 1f);
            textRect.offsetMin = new Vector2(textLeft, 0f);
            textRect.offsetMax = new Vector2(-14f, 0f);
        }

        private static RectTransform Surface(
            Transform parent,
            string name,
            Color fill,
            int radius)
        {
            var go = new GameObject(name, typeof(RectTransform), typeof(Image));
            var rect = (RectTransform)go.transform;
            rect.SetParent(parent, false);

            var image = go.GetComponent<Image>();
            image.sprite = NeonUi.BodySliced(
                radius,
                fill,
                radius > 0 ? Border : new Color(Border.r, Border.g, Border.b, 0.35f),
                1);
            image.type = Image.Type.Sliced;
            image.color = Color.white;
            image.raycastTarget = false;
            return rect;
        }

        private static RectTransform Icon(
            Transform parent,
            Vector2 size,
            Vector2 position,
            float scale)
        {
            var go = new GameObject("Icon", typeof(RectTransform));
            var rect = (RectTransform)go.transform;
            rect.SetParent(parent, false);
            rect.anchorMin = new Vector2(0.5f, 0.5f);
            rect.anchorMax = new Vector2(0.5f, 0.5f);
            rect.pivot = new Vector2(0.5f, 0.5f);
            rect.sizeDelta = size;
            rect.anchoredPosition = position;
            rect.localScale = Vector3.one * scale;
            return rect;
        }

        private static ColorBlock HoverColors()
        {
            return new ColorBlock
            {
                normalColor = Color.white,
                highlightedColor = new Color(1.16f, 1.16f, 1.16f, 1f),
                pressedColor = new Color(0.9f, 0.9f, 0.9f, 1f),
                selectedColor = Color.white,
                disabledColor = new Color(0.55f, 0.55f, 0.55f, 0.6f),
                colorMultiplier = 1f,
                fadeDuration = 0.08f,
            };
        }
    }
}