using System.Text;
using JNPF.DependencyInjection;

namespace JNPF.Common.Extension;

/// <summary>
/// StringBuilder 扩展方法类.
/// </summary>
[SuppressSniffer]
public static class StringBuilderExtensions
{
    /// <summary>
    /// 去除<seealso cref="StringBuilder"/>开头的空格.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <returns>返回修改后的StringBuilder，主要用于链式操作.</returns>
    public static StringBuilder TrimStart(this StringBuilder sb)
    {
        return sb.TrimStart(' ');
    }

    /// <summary>
    /// 去除<seealso cref="StringBuilder"/>开头的指定<seealso cref="char"/>.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="c">要去掉的<seealso cref="char"/>.</param>
    /// <returns></returns>
    public static StringBuilder TrimStart(this StringBuilder sb, char c)
    {
        if (sb.Length == 0)
            return sb;
        while (c.Equals(sb[0]))
        {
            sb.Remove(0, 1);
        }

        return sb;
    }

    /// <summary>
    /// 去除<seealso cref="StringBuilder"/>开头的指定字符数组.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="cs">要去掉的字符数组.</param>
    /// <returns></returns>
    public static StringBuilder TrimStart(this StringBuilder sb, char[] cs)
    {
        return sb.TrimStart(new string(cs));
    }

    /// <summary>
    /// 去除<see cref="StringBuilder"/>开头的指定的<seealso cref="string"/>.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="str">要去掉的<seealso cref="string"/>.</param>
    /// <returns></returns>
    public static StringBuilder TrimStart(this StringBuilder sb, string str)
    {
        if (string.IsNullOrEmpty(str)
            || sb.Length == 0
            || str.Length > sb.Length)
            return sb;
        while (sb.SubString(0, str.Length).Equals(str))
        {
            sb.Remove(0, str.Length);
            if (str.Length > sb.Length)
            {
                break;
            }
        }

        return sb;
    }

    /// <summary>
    /// 去除StringBuilder结尾的空格.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <returns>返回修改后的StringBuilder，主要用于链式操作.</returns>
    public static StringBuilder TrimEnd(this StringBuilder sb)
    {
        return sb.TrimEnd(' ');
    }

    /// <summary>
    /// 去除<see cref="StringBuilder"/>结尾指定字符.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="c">要去掉的字符.</param>
    /// <returns></returns>
    public static StringBuilder TrimEnd(this StringBuilder sb, char c)
    {
        if (sb.Length == 0)
            return sb;
        while (c.Equals(sb[sb.Length - 1]))
        {
            sb.Remove(sb.Length - 1, 1);
        }

        return sb;
    }

    /// <summary>
    /// 去除<see cref="StringBuilder"/>结尾指定字符数组.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="chars">要去除的字符数组.</param>
    /// <returns></returns>
    public static StringBuilder TrimEnd(this StringBuilder sb, char[] chars)
    {
        return sb.TrimEnd(new string(chars));
    }

    /// <summary>
    /// 去除<see cref="StringBuilder"/>结尾指定字符串.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="str">要去除的字符串.</param>
    /// <returns></returns>
    public static StringBuilder TrimEnd(this StringBuilder sb, string str)
    {
        if (string.IsNullOrEmpty(str)
            || sb.Length == 0
            || str.Length > sb.Length)
            return sb;
        while (sb.SubString(sb.Length - str.Length, str.Length).Equals(str))
        {
            sb.Remove(sb.Length - str.Length, str.Length);
            if (sb.Length < str.Length)
            {
                break;
            }
        }

        return sb;
    }

    /// <summary>
    /// 去除StringBuilder两端的空格.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <returns>返回修改后的StringBuilder，主要用于链式操作.</returns>
    public static StringBuilder Trim(this StringBuilder sb)
    {
        if (sb.Length == 0)
            return sb;
        return sb.TrimEnd().TrimStart();
    }

    /// <summary>
    /// 返回<see cref="StringBuilder"/>从起始位置指定长度的字符串.
    /// </summary>
    /// <param name="sb">StringBuilder.</param>
    /// <param name="start">起始位置.</param>
    /// <param name="length">长度.</param>
    /// <returns>字符串.</returns>
    /// <exception cref="OverflowException">超出字符串索引长度异常.</exception>
    public static string SubString(this StringBuilder sb, int start, int length)
    {
        if (start + length > sb.Length)
            throw new IndexOutOfRangeException("超出字符串索引长度");
        char[] cs = new char[length];
        for (int i = 0; i < length; i++)
        {
            cs[i] = sb[start + i];
        }

        return new string(cs);
    }
}