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package de.uniks.networkparser.buffer;

/*
NetworkParser
The MIT License
Copyright (c) 2010-2016 Stefan Lindel https://github.com/fujaba/NetworkParser/

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
*/

public abstract class BufferedBuffer extends Buffer {
	/** The count is the number of characters used. */
	protected int length;

	/** The start is the number of characters started. */
	int start;

	public boolean back() {
		if (this.position > 0) {
			this.position--;
			return true;
		}
		return false;
	}

	public BufferedBuffer withPosition(int value) {
		this.position = value;
		return this;
	}

	@Override
	public int length() {
		return length;
	}
	
	@Override
	public boolean isEnd() {
		return position()-start+1 >= length();
	}

	public BufferedBuffer withLength(int value) {
		this.length = value;
		return this;
	}

	public abstract byte byteAt(int index);

	public abstract char charAt(int index);

	/**
	 * Get the Current Character
	 * @return The currentChar
	 */
	public char getCurrentChar() {
		return charAt(position());
	}

	/**
	 * Substring of Buffer
	 * @param start		startindex for parsing
	 * @param length	the length of Substring
	 * @return 			the Substring
	 */
	public abstract CharacterBuffer subSequence(int start, int length);

	@Override
	public BufferedBuffer withLookAHead(CharSequence lookahead) {
		if(lookahead == null) {
			return this;
		}
		this.withPosition(this.position() - lookahead.length() + 1);
		return this;
	}

	@Override
	public BufferedBuffer withLookAHead(char lookahead) {
		if(lookahead < 0) {
			return this;
		}
		this.withPosition(this.position() - 1);
		return this;
	}

	@Override
	protected CharacterBuffer parseString(CharacterBuffer sc, boolean allowQuote, boolean nextStep, char... quotes) {
		if(quotes== null) {
			sc.with(getCurrentChar());
			return sc;
		}
		int startpos = this.position();
		char c;
//		boolean isQuote = false;
		char b = getCurrentChar();
		int i, quoteLen=quotes.length;
		do {
			c = getChar();
			switch (c) {
			case 0:
				c=0;
				break;
			case '\n':
			case '\r':
				break;
			default:
				if (b == '\\') {
					if (c == '\\') {
						if (allowQuote) {
							c = 0;
						}
					}
					if (allowQuote) {
						b = c;
						c = 1;
						continue;
					}
				}
			}
			b = c;
			for(i=0;i length()) {
			n = length() - position();
		}
		char[] chars = new char[n];

		while (pos < n) {
			chars[pos] = charAt(position() + pos++);
		}
		return new String(chars);
	}

	@Override
	protected CharacterBuffer nextValue(char c, boolean allowDuppleMark) {
		int start = position();
		if(allowDuppleMark) {
			while (c >= ' ' && STOPCHARSXML.indexOf(c) < 0) {
				c = getChar();
			}
		}else {
			while (c >= ' ' && STOPCHARSJSON.indexOf(c) < 0) {
				c = getChar();
			}
		}
		CharacterBuffer sb = subSequence(start, position()).trim();
		return sb;
	}

	/**
	 * @param positions		first is start Position, second is Endposition
	 *
	 *						Absolut fix Start and End start>0 StartPosition end>Start EndPosition
	 *
	 *						Absolut from fix Position Start>0 Position end NULL To End end -1 To this.index
	 *
							Relativ from indexPosition Start Position from this.index + (-Start) End = 0 current Position
	 *
	 * @return substring from buffer
	 */
	public String substring(int... positions) {
		int start = positions[0], end = -1;
		if (positions.length < 2) {
			// END IS END OF BUFFER (Exclude)
			end = length();
			if(start==-1) {
				start = this.position();
			}
		} else {
			end = positions[1];
		}
		if (end == -1) {
			end = this.position();
		} else if (end == 0) {
			if (start < 0) {
				end = this.position();
				start = this.position() + start;
			} else {
				end = this.position() + start;
				if (this.position() + end > length()) {
					end = length();
				}
				start = this.position();
			}
		}
		if (start < 0 || end <= 0 || start > end) {
			return "";
		}
		return subSequence(start, end).toString();
	}
}