package chat.server.call;

import java.io.UnsupportedEncodingException;
import java.math.BigDecimal;
import java.net.URLDecoder;
import java.net.URLEncoder;
import java.util.Date;
import java.util.List;

public class StringBuilderJSONWriter implements IJSONWriter {
	
    private StringBuilder content;
    private boolean empty;
    private boolean encode;
    private boolean nameReady;
    private boolean autoLowerName;
    

    public StringBuilderJSONWriter() {
        content = new StringBuilder();
        empty = true;
        encode = true;
        nameReady = false;
        autoLowerName = false;
    }

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

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

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

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

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

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

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

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

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

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

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

        content.append("\"" + toLower(name) + "\": \"" + encodeValue(value) + "\"");
        empty = false;
    }
    
    public void write(String name, String value, boolean needEncode) {
        if (!empty) {
            content.append(", ");
        }

        if (needEncode) {
        	content.append("\"" + toLower(name) + "\":\"" + encodeValue(value) + "\"");
        }
        else {
        	content.append("\"" + toLower(name) + "\":\"" + value + "\"");
        }
        
        empty = false;
    }
    
    public void write(String name, Integer value) {
        if (!empty) {
            content.append(", ");
        }

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

        content.append("\"" + toLower(name) + "\": " + String.valueOf(value));
        empty = false;
    }
    
    public void write(String name, Long value) {
        if (!empty) {
            content.append(", ");
        }

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

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

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

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

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

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

        content.append("\"" + toLower(name) + "\": \"" + value + "\"");
        empty = false;
    }
    

	public void write(String name, IJsonProvider jsonProvider) {
        writeName(name);
        
        if (jsonProvider == null) {
        	writeNull();
        	return;
        }
        
        jsonProvider.writeJSONObject(this);
	}
	
	public void write(String name, List<? extends IJsonProvider> list) {
        writeName(name);
        
        if (list == null) {
        	writeNull();
        	return;
        }
        
        beginArray();
        
        for (IJsonProvider json: list) {
        	json.writeJSONObject(this);	
        }
        
        endArray();
	}
	
	public void write(IJsonProvider jsonProvider) {
        if (jsonProvider == null) {
        	writeNull();
        	return;
        }
        
        jsonProvider.writeJSONObject(this);		
	}
    
	public void writeJSON(String name, String json) {
        if (!empty) {
            content.append(", ");
        }
        
        if (name != null) {
        	content.append("\"" + toLower(name) + "\": " + json);
        }
        else {
        	content.append(json);
        }
        
        empty = false;
	}
    
	public void writeNull(String name) {
        if (!empty) {
            content.append(", ");
        }
        
        if (name != null) {
        	content.append("\"" + toLower(name) + "\": null");
        }
        else {
        	content.append("null");
        }
        
        empty = false;
        nameReady = false;
	}

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

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

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

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

	public void writeNull() {
        content.append("null");
        empty = false;
        nameReady = false;
	}
	
	public void writeJSON(String json) {
        if (!empty) {
            content.append(", ");
        }
        
        content.append(json);
        empty = false;
        nameReady = false;
	}
	
    private String toLower(String name) {
    	if (name == null) {
    		return "empty";
    	}
    	
    	if (autoLowerName) {
    		return name.toLowerCase();
    	}
    	else {
    		return name;
    	}
	}
    
    private String encodeValue(String value) {
		if (!encode) {
			return value;
		}
		
		String result = "";

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

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

		return result;
	}

	public boolean isEncode() {
		return encode;
	}

	public void setEncode(boolean encode) {
		this.encode = encode;
	}

	@Override
	public String encode(String value) {
		try {
			String result = URLEncoder.encode(value, "UTF-8");
			return result;
		} 
		catch (UnsupportedEncodingException e) {
		}
		
		return value;
	}
	
	public StringBuilder getContent() {
		return content;
	}

	public static void main(String[] args) throws UnsupportedEncodingException {
		String value = "%E9%82%B5%E5%98%89%E7%A2%A7%E9%92%B0";
		System.out.println(URLDecoder.decode(value, "UTF-8"));
	}
}