using System.Globalization;
using System.Text;
using TMPro;
using UnityEngine;

[RequireComponent(typeof(TextMeshProUGUI))]
public class digits_sheet_auto : MonoBehaviour
{
    [SerializeField, Tooltip("要显示的数字，支持小数和负数")]
    private double value;

    [SerializeField, Tooltip("是否显示千分位逗号")]
    private bool showComma = true;

    [SerializeField, Tooltip("最多保留几位小数，尾数为 0 时不显示")]
    private int decimalPlaces = 3;

    private TextMeshProUGUI label;

    private void Awake()
    {
        label = GetComponent<TextMeshProUGUI>();
        if (label == null)
            label = gameObject.AddComponent<TextMeshProUGUI>();

        label.richText = true;
        Refresh();
    }

    private void OnValidate()
    {
        label = GetComponent<TextMeshProUGUI>();
        if (label != null)
            Refresh();
    }

    public void SetValue(double newValue)
    {
        value = newValue;
        Refresh();
    }

    private void Refresh()
    {
        if (label == null)
            return;

        int places = Mathf.Clamp(decimalPlaces, 0, 15);
        string format = showComma ? "#,##0" : "0";
        if (places > 0)
            format += "." + new string('#', places);

        string number = value.ToString(format, CultureInfo.InvariantCulture);
        label.text = ToSpriteTags(number);
    }

    private static string ToSpriteTags(string number)
    {
        var sb = new StringBuilder(number.Length * 24);

        foreach (char c in number)
        {
            if (c >= '0' && c <= '9')
                sb.Append("<sprite name=\"").Append(c).Append("\">");
            else if (c == ',')
                sb.Append("<sprite name=\"comma\">");
            else if (c == '.')
                sb.Append("<sprite name=\"dot\">");
            else
                sb.Append(c); // 图集里没有负号，负号退回普通字体
        }

        return sb.ToString();
    }
}