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

// Одна строка таблицы рейтинга (ссылки на её элементы; заполняет RatingPanel)
[Serializable]
public class RatingRowView
{
    public GameObject root;
    public Image background;
    public Image medal;
    public TMP_Text placeText;
    public Image avatar;
    public TMP_Text avatarLetter;
    public TMP_Text nameText;
    public Image circleBanner;
    public TMP_Text circleText;
    public TMP_Text powerText;
    public Button inspectButton;
}

// Панель "Рейтинг": разделы слева, таблица "Место / Игрок / Круг / Мощь", страницы внизу.
public class RatingPanel : MonoBehaviour
{
    public const int PageSize = 10;

    [Header("Общее")]
    public Button closeButton;
    public TMP_Text statusText;

    [Header("Разделы (порядок как в RatingCategory)")]
    public Button[] categoryButtons;

    [Header("Таблица")]
    public TMP_Text nameColumnHeader;
    public TMP_Text circleColumnHeader;
    public RatingRowView[] rows;
    public TMP_Text emptyText;

    [Header("Страницы")]
    public Button prevPageButton;
    public Button nextPageButton;
    public Button[] pageButtons;

    static readonly Color GoldRow = new Color(0.45f, 0.32f, 0.1f, 0.95f);
    static readonly Color SilverRow = new Color(0.28f, 0.31f, 0.36f, 0.95f);
    static readonly Color BronzeRow = new Color(0.36f, 0.22f, 0.12f, 0.95f);
    static readonly Color EvenRow = new Color(0.07f, 0.09f, 0.13f, 0.95f);
    static readonly Color OddRow = new Color(0.1f, 0.12f, 0.17f, 0.95f);
    static readonly Color[] MedalColors = { new Color(0.95f, 0.75f, 0.3f), new Color(0.8f, 0.83f, 0.88f), new Color(0.8f, 0.5f, 0.28f) };

    static readonly Color ActiveButton = new Color(0.16f, 0.35f, 0.7f);
    static readonly Color InactiveButton = new Color(0.1f, 0.12f, 0.17f);

    static readonly Color[] BannerColors =
    {
        new Color(0.15f, 0.35f, 0.75f), new Color(0.45f, 0.2f, 0.18f), new Color(0.7f, 0.15f, 0.15f),
        new Color(0.2f, 0.45f, 0.2f), new Color(0.75f, 0.5f, 0.1f), new Color(0.35f, 0.35f, 0.4f)
    };

    private RatingCategory category = RatingCategory.Players;
    private int pageIndex;

    void Awake()
    {
        closeButton.onClick.AddListener(Close);
        prevPageButton.onClick.AddListener(() => ShowPage(pageIndex - 1));
        nextPageButton.onClick.AddListener(() => ShowPage(pageIndex + 1));

        for (int i = 0; i < categoryButtons.Length; i++)
        {
            RatingCategory c = (RatingCategory)i;
            categoryButtons[i].onClick.AddListener(() => SelectCategory(c));
        }

        foreach (var row in rows)
        {
            // Круглая медаль -- спрайт генерируется в коде, поэтому ставим его здесь, а не в сборщике сцены
            row.medal.sprite = PrimitiveSprites.Circle;
        }
    }

    public void Open()
    {
        gameObject.SetActive(true);
        SelectCategory(category);
    }

    public void Close()
    {
        gameObject.SetActive(false);
    }

    void SelectCategory(RatingCategory newCategory)
    {
        category = newCategory;
        for (int i = 0; i < categoryButtons.Length; i++)
            categoryButtons[i].image.color = i == (int)category ? ActiveButton : InactiveButton;

        bool circles = category == RatingCategory.Circles;
        nameColumnHeader.text = circles ? "Круг" : "Игрок";
        circleColumnHeader.text = circles ? "Глава" : "Круг";

        ShowPage(0);
    }

    int PageCount => Mathf.Max(1, Mathf.CeilToInt(RatingService.Instance.GetTotalCount(category) / (float)PageSize));

    void ShowPage(int newPageIndex)
    {
        pageIndex = Mathf.Clamp(newPageIndex, 0, PageCount - 1);
        statusText.text = "";

        bool available = RatingService.Instance.IsAvailable(category);
        emptyText.gameObject.SetActive(!available);
        emptyText.text = "Раздел в разработке";

        List<RatingEntry> entries = available
            ? RatingService.Instance.GetPage(category, pageIndex, PageSize)
            : new List<RatingEntry>();

        for (int i = 0; i < rows.Length; i++)
        {
            if (i < entries.Count) FillRow(rows[i], entries[i], i);
            else rows[i].root.SetActive(false);
        }

        UpdatePagination(available);
    }

    void FillRow(RatingRowView row, RatingEntry entry, int indexOnPage)
    {
        row.root.SetActive(true);

        bool top3 = entry.place <= 3;
        row.background.color = entry.place == 1 ? GoldRow
            : entry.place == 2 ? SilverRow
            : entry.place == 3 ? BronzeRow
            : indexOnPage % 2 == 0 ? EvenRow : OddRow;

        row.medal.gameObject.SetActive(top3);
        if (top3) row.medal.color = MedalColors[entry.place - 1];
        row.placeText.text = entry.place.ToString();
        row.placeText.color = top3 ? new Color(0.2f, 0.12f, 0.05f) : Color.white;

        // Аватар-заглушка: цветной квадрат с первой буквой имени
        row.avatar.color = Color.Lerp(BannerColors[StableHash(entry.name) % BannerColors.Length], Color.black, 0.25f);
        row.avatarLetter.text = entry.name.Substring(0, 1).ToUpper();

        row.nameText.text = entry.name;
        row.circleText.text = entry.circleName;
        row.circleBanner.color = BannerColors[StableHash(category == RatingCategory.Circles ? entry.name : entry.circleName) % BannerColors.Length];
        row.powerText.text = FormatPower(entry.power);

        string name = entry.name;
        row.inspectButton.onClick.RemoveAllListeners();
        row.inspectButton.onClick.AddListener(() => statusText.text = $"Профиль «{name}» пока недоступен");
    }

    void UpdatePagination(bool available)
    {
        int pageCount = PageCount;
        prevPageButton.interactable = available && pageIndex > 0;
        nextPageButton.interactable = available && pageIndex < pageCount - 1;

        // Окно из 5 номеров вокруг текущей страницы
        int first = Mathf.Clamp(pageIndex - pageButtons.Length / 2, 0, Mathf.Max(0, pageCount - pageButtons.Length));
        for (int i = 0; i < pageButtons.Length; i++)
        {
            int page = first + i;
            Button button = pageButtons[i];
            bool visible = available && page < pageCount;
            button.gameObject.SetActive(visible);
            if (!visible) continue;

            button.GetComponentInChildren<TMP_Text>().text = (page + 1).ToString();
            button.image.color = page == pageIndex ? ActiveButton : InactiveButton;
            button.onClick.RemoveAllListeners();
            button.onClick.AddListener(() => ShowPage(page));
        }
    }

    // 128530000 -> "128 530 000"
    static string FormatPower(long power)
    {
        return power.ToString("N0", CultureInfo.InvariantCulture).Replace(',', ' ');
    }

    // string.GetHashCode в Unity может меняться между запусками -- для цвета баннера нужен стабильный
    static int StableHash(string s)
    {
        int hash = 17;
        foreach (char c in s) hash = hash * 31 + c;
        return hash & int.MaxValue;
    }
}