module esstool.stringbuilder;

import esstool;
import std.conv : to;

public class StringBuilder
{
    private string strbuffered = "";
    this()
    {
    }

    this(string def)
    {
        this.strbuffered = def;
    }

    public StringBuilder append(byte b)
    {
        return this.append(to!char(b));
    }

    public StringBuilder append(ubyte b)
    {
        return this.append(to!char(b));
    }

    public StringBuilder append(char c)
    {
        this.strbuffered ~= c;
        return this;
    }

    public StringBuilder append(string s)
    {
        this.strbuffered ~= s;
        return this;
    }

    public StringBuilder append(int i)
    {
        this.strbuffered ~= i;
        return this;
    }

    public StringBuilder append(uint i)
    {
        this.strbuffered ~= i;
        return this;
    }

    public StringBuilder append(float f)
    {
        this.strbuffered ~= to!string(f);
        return this;
    }

    public StringBuilder append(double d)
    {
        this.strbuffered ~= to!string(d);
        return this;
    }

    public StringBuilder removeAt(int index)
    {
        this.strbuffered = this.strbuffered[0 .. index] ~ this.strbuffered[index + 1 .. $];
        return this;
    }

    public StringBuilder removeFirst()
    {
        this.strbuffered = this.strbuffered[1 .. $];
        return this;
    }

    public StringBuilder removeLast()
    {
        this.strbuffered = this.strbuffered[0 .. $ - 1];
        return this;
    }

    public StringBuilder clean()
    {
        this.strbuffered = "";
        return this;
    }

    public StringBuilder appendNewLine()
    {
        this.strbuffered ~= "\r\n";
        return this;
    }

    public int indexOf(string str)
    {
        int index = 0;
        int startAt = 0;
        int maxIndex = len(str) - 1;

        for (int i = 0; i < len(this.strbuffered); i++)
        {
            char c = this.strbuffered[i];
            char pChar = str[index];
            if (c != pChar)
            {
                index = 0;
                continue;
            }

            if (index++ == 0)
            {
                startAt = i;
            }

            if (index == maxIndex)
            {
                return startAt;
            }
        }

        return -1;
    }

    public StringBuilder replaceFirst(string oldStr, string newStr)
    {
        int startAt = this.indexOf(oldStr);
        if (startAt == -1)
        {
            return this;
        }

        int endAt = startAt + len(oldStr);

        string head = this.strbuffered[0 .. startAt - 1];
        string end = this.strbuffered[endAt .. $ - 1];

        this.strbuffered = "";
        this.append(head).append(newStr).append(end);

        return this;
    }

    public StringBuilder remove(char s)
    {
        string newStr = "";
        for (int i = 0; i < len(this.strbuffered); i++)
        {
            char c = this.strbuffered[i];
            if (c == s)
            {
                continue;
            }

            newStr ~= c;
        }

        this.strbuffered = newStr;
        return this;
    }

    public int size()
    {
        import esstool.arrayutil : len;

        return len(this.strbuffered);
    }

    public string asString()
    {
        return this.strbuffered;
    }
}