package foundation.json;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.URLEncoder;
import java.text.DateFormat;
import java.text.SimpleDateFormat;
import java.util.Date;
import java.util.List;

public class JSONBuilder implements IJSONWriter, IJSONProvider {
	
    private StringBuilder writer;
	private boolean encodeActive;
	private boolean lowerNameActive;
    private boolean empty;
    private boolean nameReady;
    private String operator;
    
    public JSONBuilder() {
    	writer = new StringBuilder();
        empty = true;
        nameReady = false;
        encodeActive = true;
        lowerNameActive = true;
    }

    public void beginObject() {
        if (!nameReady && !empty) {
        	writer.append(", ");
        }

        writer.append("{");
        empty = true;
        nameReady = false;
    }

    public void beginObject(String name) {
        if (!empty) {
            writer.append(", ");
        }

        if (name != null) {
        	writer.append("\"" + formatName(name) + "\": {");
        }
        else {
        	writer.append("{");
        }
        
        empty = true;
    }

	public void endObject() {
        writer.append("}");
        empty = false;
        nameReady = false;
    }

    public void beginArray() {
        if (!nameReady && !empty) {
            writer.append(", ");
        }

        writer.append("[");
        empty = true;
        nameReady = false;
    }

    public void beginArray(String name) {
        if (!empty) {
            writer.append(", ");
        }

        if (name != null) {
        	writer.append("\"" + formatName(name) + "\": [");
        }
        else {
        	writer.append("[");
        }
        
        empty = true;
        nameReady = false;
    }

    public void endArray() {
        writer.append("]");
        empty = false;
        nameReady = false;
    }

    public void write(String name, String value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": \"" + formatValue(value) + "\"");
        empty = false;
    }
    
	@Override
	public void write(String value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatValue(value) + "\"");
        empty = false;		
	}

    public void write(String name, Integer value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": " + String.valueOf(value));
        empty = false;
    }
    
	@Override
	public void write(Integer value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append(String.valueOf(value));
        empty = false;		
	}

    public void write(String name, Double value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": " + String.valueOf(value));
        empty = false;
    }
    
	@Override
	public void write(Double value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append(String.valueOf(value));
        empty = false;		
	}

	public void write(String name, Long value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": " + String.valueOf(value));
        empty = false;
    }

	@Override
	public void write(Long value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append(String.valueOf(value));
        empty = false;		
	}

    public void write(String name, BigDecimal value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": " + String.valueOf(value));
        empty = false;
    }

	@Override
	public void write(BigDecimal value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append(String.valueOf(value));
        empty = false;		
	}

    public void write(String name, boolean value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": " + (value ? "true" : "false"));
        empty = false;
    }

	@Override
	public void write(boolean value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append((value ? "true" : "false"));
        empty = false;		
	}

    public void write(String name, Date value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + formatName(name) + "\": \"" + value + "\"");
        empty = false;
    }
    
    public void write(String name, Date value, String fomater) {
        if (!empty) {
            writer.append(", ");
        }

        if (value == null) {
            writer.append("\"" + formatName(name) + "\": null");
            empty = false;
            return;
        }
        
		DateFormat dateFormat = new SimpleDateFormat(fomater);
		String result = dateFormat.format(value);
		
        writer.append("\"" + formatName(name) + "\": \"" + result + "\"");
        empty = false;
    }

	@Override
	public void write(Date value) {
        if (!empty) {
            writer.append(", ");
        }

        writer.append("\"" + value + "\"");
        empty = false;		
	}

	public void write(String name, IJSONProvider jsonProvider) {
        writeName(name);
        
        if (jsonProvider == null) {
        	writeNull();
        	return;
        }
        
        jsonProvider.writeJSON(this);
	}

	public void write(String name, List<? extends IJSONProvider> list) {
        writeName(name);
        
        if (list == null) {
        	writeNull();
        	return;
        }
        
        beginArray();
        
        for (IJSONProvider json: list) {
        	json.writeJSON(this);	
        }
        
        endArray();
	}
	
	public void write(IJSONProvider jsonProvider) {
        if (jsonProvider == null) {
        	writeNull();
        	return;
        }

        jsonProvider.writeJSON(this);		
	}
    
	public void writeJSON(String name, String json) {
        if (!empty) {
            writer.append(", ");
        }
        
        if (name != null) {
        	writer.append("\"" + formatName(name) + "\": " + json);
        }
        else {
        	writer.append(json);
        }
        
        empty = false;
	}
    
	public void writeNull(String name) {
        if (!empty) {
            writer.append(", ");
        }
        
        if (name != null) {
        	writer.append("\"" + formatName(name) + "\": null");
        }
        else {
        	writer.append("null");
        }
        
        empty = false;
        nameReady = false;
	}

    public void writeName(String name) {
        if (!empty) {
            writer.append(", ");
        }
        
        if (name != null) {
        	writer.append("\"" + formatName(name) + "\": ");
        }
        
        nameReady = true;
    }
    
    public void writeValue(String value) {
        writer.append("\"" + formatValue(value) + "\"");
        empty = false;
        nameReady = false;
    }
    
    public void writeValue(int value) {
        writer.append(String.valueOf(value));
        empty = false;
        nameReady = false;
    }

    public void writeValue(BigDecimal value) {
        writer.append(String.valueOf(value));
        empty = false;
        nameReady = false;
    }

    public void writeValue(boolean value) {
        writer.append(value ? "true" : "false");
        empty = false;
        nameReady = false;
    }

    public void writeValue(Date value) {
        writer.append("\"" + value + "\"");
        empty = false;
        nameReady = false;
    }

	public void writeNull() {
        writer.append("null");
        empty = false;
        nameReady = false;
	}
	
	public void writeJSON(String json) {
        if (!empty) {
            writer.append(", ");
        }
        
        writer.append(json);
        empty = false;
        nameReady = false;
	}
	
    private String formatName(String name) {
    	if (name == null) {
    		return "empty";
    	}
    	
    	if (!lowerNameActive) {
    		return name;
    	}
    	
    	return name.toLowerCase();
	}
    
    public String formatValue(String value) {
		String result = "";

		if (value == null) {
			return result;
		}
		
		if (!encodeActive) {
			return value;
		}

		try {
			result = URLEncoder.encode(value, "UTF-8");
			result = result.replace("+", "%20");
		}
		catch (Exception e) {
			result = value;
		}

		return result;
	}

	public void flush() {
		
	}

	public void close() {
		
	}
	
	public String toString() {
		return writer.toString();
	}
	
	public byte[] getBytes() throws UnsupportedEncodingException {
		String result = toString();
		return result.getBytes("UTF-8");
	}
	
	@Override
	public void checkEmpty() {
        if (!empty) {
            writer.append(", ");
        }
	}
	
	@Override
	public String getOperator() {
		return operator;
	}

	public void setOperator(String operator) {
		this.operator = operator;
	}
	
	public boolean isEncodeActive() {
		return encodeActive;
	}

	public void setEncodeActive(boolean encodeActive) {
		this.encodeActive = encodeActive;
	}

	public boolean isLowerNameActive() {
		return lowerNameActive;
	}

	public void setLowerNameActive(boolean lowerNameActive) {
		this.lowerNameActive = lowerNameActive;
	}

	@Override
	public void writeJSON(IJSONWriter writer) {
		writer.writeJSON(this.writer.toString());
	}

	@Override
	public void write(String name, Object value) {
		// TODO Auto-generated method stub
		
	}
}