using System;
using System.Collections;
using UnityEngine;
using UnityEngine.UI;
using TMPro;

// Конструктор интерфейса из кода: текст, кнопки, строки, прокрутка, полоски прогресса,
// всплывающие сообщения (Toast) и окна (подтверждение, ввод имени, результат боя).
//
// Почему из кода: списки (задания, письма, товары) меняются во время игры, их всё равно
// надо создавать на лету. Цвета и размеры -- в Theme ниже, дизайнер может поменять их тут.
public static class UIKit
{
    // ---------------- ТЕМА ----------------
    public static class Theme
    {
        public static readonly Color Card = new Color(0.17f, 0.19f, 0.24f, 1f);
        public static readonly Color CardDark = new Color(0.12f, 0.13f, 0.17f, 1f);
        public static readonly Color CardDone = new Color(0.16f, 0.26f, 0.18f, 1f);
        public static readonly Color Gold = new Color(0.95f, 0.75f, 0.25f, 1f);
        public static readonly Color Green = new Color(0.25f, 0.62f, 0.3f, 1f);
        public static readonly Color Red = new Color(0.72f, 0.24f, 0.22f, 1f);
        public static readonly Color Blue = new Color(0.25f, 0.45f, 0.75f, 1f);
        public static readonly Color Gray = new Color(0.32f, 0.33f, 0.37f, 1f);
        public static readonly Color Text = new Color(0.95f, 0.95f, 0.95f, 1f);
        public static readonly Color TextDim = new Color(0.7f, 0.72f, 0.78f, 1f);
        public static readonly Color BarBg = new Color(0.08f, 0.08f, 0.1f, 1f);
    }

    // ---------------- БАЗА ----------------

    public static RectTransform Make(string name, Transform parent)
    {
        var go = new GameObject(name, typeof(RectTransform));
        go.transform.SetParent(parent, false);
        return (RectTransform)go.transform;
    }

    public static RectTransform Stretch(RectTransform rt, float left = 0, float top = 0, float right = 0, float bottom = 0)
    {
        rt.anchorMin = Vector2.zero; rt.anchorMax = Vector2.one;
        rt.offsetMin = new Vector2(left, bottom);
        rt.offsetMax = new Vector2(-right, -top);
        return rt;
    }

    public static LayoutElement Size(Component c, float width = -1, float height = -1, float flexW = -1)
    {
        var le = c.GetComponent<LayoutElement>();
        if (le == null) le = c.gameObject.AddComponent<LayoutElement>();
        if (width >= 0) { le.preferredWidth = width; le.minWidth = width; }
        if (height >= 0) { le.preferredHeight = height; le.minHeight = height; }
        if (flexW >= 0) le.flexibleWidth = flexW;
        return le;
    }

    public static void Clear(Transform t)
    {
        for (int i = t.childCount - 1; i >= 0; i--)
        {
            var c = t.GetChild(i).gameObject;
            c.SetActive(false);
            UnityEngine.Object.Destroy(c);
        }
    }

    // ---------------- ЭЛЕМЕНТЫ ----------------

    public static Image Box(Transform parent, Color color, float height = -1)
    {
        var rt = Make("Box", parent);
        var img = rt.gameObject.AddComponent<Image>();
        img.color = color;
        if (height >= 0) Size(img, -1, height);
        return img;
    }

    public static TextMeshProUGUI Text(Transform parent, string text, float size = 30, Color? color = null,
        TextAlignmentOptions align = TextAlignmentOptions.Left, float height = -1)
    {
        var rt = Make("Text", parent);
        var t = rt.gameObject.AddComponent<TextMeshProUGUI>();
        t.text = text;
        t.fontSize = size;
        t.color = color ?? Theme.Text;
        t.alignment = align;
        t.raycastTarget = false;
        t.richText = true;
        if (height >= 0) Size(t, -1, height);
        return t;
    }

    public static Button Button(Transform parent, string label, Color color, Action onClick,
        float width = -1, float height = 86, float fontSize = 28)
    {
        var rt = Make("Btn_" + label, parent);
        var img = rt.gameObject.AddComponent<Image>();
        img.color = color;
        var b = rt.gameObject.AddComponent<Button>();
        var colors = b.colors;
        colors.disabledColor = new Color(0.55f, 0.55f, 0.55f, 0.6f);
        b.colors = colors;
        if (onClick != null) b.onClick.AddListener(() => onClick());
        var t = Text(rt, label, fontSize, Theme.Text, TextAlignmentOptions.Center);
        Stretch(t.rectTransform, 8, 4, 8, 4);
        t.enableAutoSizing = true; t.fontSizeMin = 16; t.fontSizeMax = fontSize;
        Size(b, width, height);
        return b;
    }

    public static void SetButton(Button b, string label, bool interactable)
    {
        if (b == null) return;
        var t = b.GetComponentInChildren<TextMeshProUGUI>();
        if (t != null && label != null) t.text = label;
        b.interactable = interactable;
    }

    // Горизонтальная строка: элементы слева направо
    public static RectTransform Row(Transform parent, float height = 90, float spacing = 12, Color? bg = null, int padding = 0)
    {
        var rt = Make("Row", parent);
        if (bg.HasValue) rt.gameObject.AddComponent<Image>().color = bg.Value;
        var h = rt.gameObject.AddComponent<HorizontalLayoutGroup>();
        h.spacing = spacing;
        h.padding = new RectOffset(padding, padding, padding, padding);
        h.childAlignment = TextAnchor.MiddleLeft;
        h.childControlWidth = true; h.childControlHeight = true;
        h.childForceExpandWidth = false; h.childForceExpandHeight = true;
        if (height >= 0) Size(rt, -1, height);
        return rt;
    }

    // Вертикальная "карточка": элементы сверху вниз, высота по содержимому
    public static RectTransform Card(Transform parent, Color? bg = null, int padding = 18, float spacing = 10)
    {
        var rt = Make("Card", parent);
        rt.gameObject.AddComponent<Image>().color = bg ?? Theme.Card;
        var v = rt.gameObject.AddComponent<VerticalLayoutGroup>();
        v.padding = new RectOffset(padding, padding, padding, padding);
        v.spacing = spacing;
        v.childControlWidth = true; v.childControlHeight = true;
        v.childForceExpandWidth = true; v.childForceExpandHeight = false;
        return rt;
    }

    public static RectTransform Spacer(Transform parent, float height)
    {
        var rt = Make("Spacer", parent);
        Size(rt, -1, height);
        return rt;
    }

    // Прокручиваемый список на всю область parent. Возвращает контейнер для элементов.
    public static RectTransform ScrollList(Transform parent, out ScrollRect scroll, float spacing = 14)
    {
        var root = Stretch(Make("Scroll", parent));
        var bg = root.gameObject.AddComponent<Image>();
        bg.color = new Color(0, 0, 0, 0); // прозрачный, но ловит свайпы
        scroll = root.gameObject.AddComponent<ScrollRect>();
        scroll.horizontal = false;
        scroll.movementType = ScrollRect.MovementType.Elastic;
        scroll.scrollSensitivity = 40f;

        var viewport = Stretch(Make("Viewport", root));
        viewport.gameObject.AddComponent<RectMask2D>();

        var content = Make("Content", viewport);
        content.anchorMin = new Vector2(0, 1); content.anchorMax = new Vector2(1, 1);
        content.pivot = new Vector2(0.5f, 1);
        content.offsetMin = Vector2.zero; content.offsetMax = Vector2.zero;
        var v = content.gameObject.AddComponent<VerticalLayoutGroup>();
        v.spacing = spacing;
        v.padding = new RectOffset(6, 6, 6, 24);
        v.childControlWidth = true; v.childControlHeight = true;
        v.childForceExpandWidth = true; v.childForceExpandHeight = false;
        var fit = content.gameObject.AddComponent<ContentSizeFitter>();
        fit.verticalFit = ContentSizeFitter.FitMode.PreferredSize;

        scroll.viewport = viewport;
        scroll.content = content;
        return content;
    }

    // Полоска прогресса. Возвращает картинку заливки (для обновления через SetBar)
    public static Image Bar(Transform parent, float fraction, Color fill, float height = 26, string label = null)
    {
        var bg = Box(parent, Theme.BarBg, height);
        var f = Make("Fill", bg.transform);
        var img = f.gameObject.AddComponent<Image>();
        img.color = fill;
        img.raycastTarget = false;
        f.anchorMin = Vector2.zero; f.offsetMin = Vector2.zero; f.offsetMax = Vector2.zero;
        SetBar(img, fraction);
        if (label != null)
        {
            var t = Text(bg.transform, label, height * 0.7f, Theme.Text, TextAlignmentOptions.Center);
            Stretch(t.rectTransform);
            t.name = "Label";
        }
        return img;
    }

    public static void SetBar(Image fill, float fraction, string label = null)
    {
        if (fill == null) return;
        var rt = fill.rectTransform;
        rt.anchorMax = new Vector2(Mathf.Clamp01(fraction), 1);
        if (label != null)
        {
            var t = fill.transform.parent.Find("Label");
            if (t != null) t.GetComponent<TextMeshProUGUI>().text = label;
        }
    }

    // Цветной квадрат-иконка (заглушка, пока нет спрайтов) с буквой
    public static Image Icon(Transform parent, Color color, string letter, float size = 80)
    {
        var img = Box(parent, color);
        Size(img, size, size);
        if (!string.IsNullOrEmpty(letter))
        {
            var t = Text(img.transform, letter, size * 0.5f, Color.white, TextAlignmentOptions.Center);
            Stretch(t.rectTransform);
            t.fontStyle = FontStyles.Bold;
        }
        return img;
    }

    public static Slider Slider(Transform parent, float value, Action<float> onChange)
    {
        var go = DefaultControls.CreateSlider(new DefaultControls.Resources());
        go.transform.SetParent(parent, false);
        var s = go.GetComponent<Slider>();
        s.minValue = 0; s.maxValue = 1; s.value = value;
        foreach (var img in go.GetComponentsInChildren<Image>())
        {
            if (img.name == "Background") img.color = Theme.BarBg;
            else if (img.name == "Fill") img.color = Theme.Gold;
            else if (img.name == "Handle") img.color = Color.white;
        }
        if (onChange != null) s.onValueChanged.AddListener(v => onChange(v));
        Size(s, -1, 50, 1);
        return s;
    }

    // Кнопка-переключатель ВКЛ/ВЫКЛ
    public static Button Switch(Transform parent, bool on, Action<bool> onChange)
    {
        Button b = null;
        bool state = on;
        b = Button(parent, on ? "ВКЛ" : "ВЫКЛ", on ? Theme.Green : Theme.Gray, () =>
        {
            state = !state;
            b.GetComponent<Image>().color = state ? Theme.Green : Theme.Gray;
            b.GetComponentInChildren<TextMeshProUGUI>().text = state ? "ВКЛ" : "ВЫКЛ";
            if (onChange != null) onChange(state);
        }, 160, 70);
        return b;
    }

    // Вкладки: ряд кнопок, текущая подсвечена
    public static void Tabs(Transform parent, string[] names, int current, Action<int> onSelect)
    {
        var row = Row(parent, 80, 8);
        for (int i = 0; i < names.Length; i++)
        {
            int idx = i;
            var b = Button(row, names[i], i == current ? Theme.Gold : Theme.CardDark, () => onSelect(idx), -1, 80, 28);
            Size(b, -1, 80, 1);
            if (i == current) b.GetComponentInChildren<TextMeshProUGUI>().color = new Color(0.15f, 0.1f, 0.05f);
        }
    }

    // ---------------- ВЕРХНИЙ СЛОЙ (тосты и окна) ----------------

    static RectTransform overlay;

    public static RectTransform Overlay
    {
        get
        {
            if (overlay == null)
            {
                var go = new GameObject("UI_Overlay", typeof(RectTransform), typeof(Canvas), typeof(CanvasScaler), typeof(GraphicRaycaster));
                var canvas = go.GetComponent<Canvas>();
                canvas.renderMode = RenderMode.ScreenSpaceOverlay;
                canvas.sortingOrder = 1000;
                var scaler = go.GetComponent<CanvasScaler>();
                scaler.uiScaleMode = CanvasScaler.ScaleMode.ScaleWithScreenSize;
                scaler.referenceResolution = new Vector2(1080, 1920);
                scaler.matchWidthOrHeight = 0.5f;
                overlay = (RectTransform)go.transform;
            }
            return overlay;
        }
    }

    static ToastRunner runner;
    static ToastRunner Runner
    {
        get
        {
            if (runner == null) runner = Overlay.gameObject.AddComponent<ToastRunner>();
            return runner;
        }
    }

    // Всплывающее сообщение внизу экрана на 2.5 секунды
    public static void Toast(string message)
    {
        if (string.IsNullOrEmpty(message)) return;
        if (!Application.isPlaying) { Debug.Log(message); return; }
        Runner.Show(message);
    }

    class ToastRunner : MonoBehaviour
    {
        int active;
        public void Show(string message) { StartCoroutine(Run(message)); }

        IEnumerator Run(string message)
        {
            var rt = Make("Toast", Overlay);
            rt.anchorMin = new Vector2(0.08f, 0); rt.anchorMax = new Vector2(0.92f, 0);
            rt.pivot = new Vector2(0.5f, 0);
            rt.anchoredPosition = new Vector2(0, 300 + active * 110);
            rt.sizeDelta = new Vector2(0, 96);
            var img = rt.gameObject.AddComponent<Image>();
            img.color = new Color(0.05f, 0.05f, 0.07f, 0.92f);
            img.raycastTarget = false;
            var t = Text(rt, message, 28, Theme.Text, TextAlignmentOptions.Center);
            Stretch(t.rectTransform, 20, 6, 20, 6);
            t.enableAutoSizing = true; t.fontSizeMin = 16; t.fontSizeMax = 28;
            var group = rt.gameObject.AddComponent<CanvasGroup>();
            group.blocksRaycasts = false;
            active++;
            yield return new WaitForSecondsRealtime(2.2f);
            for (float a = 1; a > 0; a -= Time.unscaledDeltaTime * 3f) { group.alpha = a; yield return null; }
            active--;
            Destroy(rt.gameObject);
        }
    }

    // Окно поверх всего: затемнение + карточка по центру. Возвращает карточку для наполнения.
    public static RectTransform Modal(string title, out GameObject root)
    {
        var dim = Stretch(Make("Modal", Overlay));
        dim.gameObject.AddComponent<Image>().color = new Color(0, 0, 0, 0.65f);
        root = dim.gameObject;

        var card = Card(dim, Theme.CardDark, 32, 20);
        card.anchorMin = new Vector2(0.06f, 0.5f); card.anchorMax = new Vector2(0.94f, 0.5f);
        card.pivot = new Vector2(0.5f, 0.5f);
        card.anchoredPosition = Vector2.zero;
        var fit = card.gameObject.AddComponent<ContentSizeFitter>();
        fit.verticalFit = ContentSizeFitter.FitMode.PreferredSize;

        var t = Text(card, title, 42, Theme.Gold, TextAlignmentOptions.Center);
        t.fontStyle = FontStyles.Bold;
        return card;
    }

    public static void Message(string title, string text, string button = "ОК", Action onClose = null)
    {
        GameObject root;
        var card = Modal(title, out root);
        Text(card, text, 30, Theme.Text, TextAlignmentOptions.Center);
        Spacer(card, 10);
        Button(card, button, Theme.Green, () => { UnityEngine.Object.Destroy(root); if (onClose != null) onClose(); }, -1, 96, 32);
    }

    public static void Confirm(string title, string text, string yes, Action onYes)
    {
        GameObject root;
        var card = Modal(title, out root);
        Text(card, text, 30, Theme.Text, TextAlignmentOptions.Center);
        var row = Row(card, 96, 20);
        var no = Button(row, "Отмена", Theme.Gray, () => UnityEngine.Object.Destroy(root));
        Size(no, -1, 96, 1);
        var ok = Button(row, yes, Theme.Red, () => { UnityEngine.Object.Destroy(root); if (onYes != null) onYes(); });
        Size(ok, -1, 96, 1);
    }

    public static void InputDialog(string title, string initial, int maxLength, Action<string> onOk)
    {
        GameObject root;
        var card = Modal(title, out root);
        var go = TMP_DefaultControls.CreateInputField(new TMP_DefaultControls.Resources());
        go.transform.SetParent(card, false);
        var input = go.GetComponent<TMP_InputField>();
        input.text = initial;
        input.characterLimit = maxLength;
        input.pointSize = 34;
        go.GetComponent<Image>().color = new Color(0.9f, 0.9f, 0.92f);
        Size(input, -1, 90);

        var row = Row(card, 96, 20);
        var no = Button(row, "Отмена", Theme.Gray, () => UnityEngine.Object.Destroy(root));
        Size(no, -1, 96, 1);
        var ok = Button(row, "Сохранить", Theme.Green, () =>
        {
            string v = input.text.Trim();
            if (v.Length == 0) { Toast("Имя не может быть пустым"); return; }
            UnityEngine.Object.Destroy(root);
            if (onOk != null) onOk(v);
        });
        Size(ok, -1, 96, 1);
    }
}