package cse308.swift.server.quotequerier;

import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.Reader;
import java.io.UnsupportedEncodingException;
import java.net.MalformedURLException;
import java.net.URL;
import java.text.SimpleDateFormat;
import java.util.Date;

import org.apache.log4j.Logger;

import com.sun.imageio.plugins.common.InputStreamAdapter;
import com.sun.xml.internal.bind.v2.schemagen.xmlschema.List;

import cse308.swift.shared.beans.QuoteHistoricalData;

import au.com.bytecode.opencsv.CSVReader;

public class YahooQuoteQuerier 
{
	/**
	 * Instance of the Logger Object
	 */
	static Logger logger = Logger.getLogger(YahooQuoteQuerier.class.getName());
	
	/**
	 * The Base URL to Connect to Yahoo's Historical Data Service
	 */
	final private String BASE_URL = "http://ichart.finance.yahoo.com/table.csv?" ;
	
	public enum IntervalRetrievalType {DAILY, WEEKLY, MONTHLY}
	
	/**
	 * This method retrieves the historical data from Yahoo in the form of a .csv file.
	 * @param quoteSymbol The symbol of the Quote
	 * @param startDate The start date of the retrieval
	 * @param endDate The end data of the retrieval
	 * @param retrievalType Whether the Retrieval will return Daily, Weekly or Monthly Data
	 */
	private QuoteHistoricalData fetchData(String quoteSymbol, Date startDate, Date endDate, IntervalRetrievalType retrievalType)
	{
		String fetchURL = BASE_URL + "s=" + quoteSymbol.toUpperCase();
		if(startDate != null)
		{
			SimpleDateFormat monthFormat = new SimpleDateFormat("MM");
			SimpleDateFormat dayFormat = new SimpleDateFormat("d");
			SimpleDateFormat yearFormat = new SimpleDateFormat("yyyy");
			fetchURL += "&a=" + monthFormat.format(startDate)
				+ "&b=" + dayFormat.format(startDate)
				+ "&c=" + yearFormat.format(startDate);
			if(endDate != null)
			{
				fetchURL += "&d" + monthFormat.format(endDate)
					+ "&e=" + dayFormat.format(endDate)
					+ "&f=" + yearFormat.format(endDate);
			}
		}
		switch(retrievalType)
		{
			case DAILY:
				fetchURL += "&g=d";
				break;
			case MONTHLY:
				fetchURL += "&g=m";
				break;
			case WEEKLY:
				fetchURL += "&g=w";
				break;
		}
		logger.info("Getting Historical Data for Quote: " + quoteSymbol +
				"\n Fetch URL: " + fetchURL);
		try {
			URL csvURL = new URL(fetchURL);
			InputStream in = csvURL.openStream();
			CSVReader csvReader = new CSVReader(new InputStreamReader(in, "UTF-8"));
			java.util.List<String[]> csvList = csvReader.readAll();
			QuoteHistoricalData qhd = new QuoteHistoricalData(quoteSymbol, startDate, endDate, fetchURL, csvList);
			logger.info("Successfully Retrieved Historical Data for Quote: " + quoteSymbol);
			return qhd;
		} catch (MalformedURLException e) {
			logger.warn("Error Generating Fetch URL!");
		} catch (UnsupportedEncodingException e) {
			logger.warn("Error Generating Fetch URL, Encoding is Incorrect!");
		} catch (IOException e) {
			logger.warn("Error Fetching URL - Quote Maybe Inccorrect!");
		}
		return null;
	}
	
	/**
	 * Gets the Historical Data of the Quote Based on the Start Date and End Date
	 * @param quoteSymbol The Quote of the Stock
	 * @param startDate The Start Date from where you want to get the Data From
	 * @param endDate The End Date
	 * @param retrievalType Whether the Retrieval will return Daily, Weekly or Monthly Data 
	 */
	public QuoteHistoricalData getQuoteHistoricalData(String quoteSymbol, Date startDate, Date endDate, IntervalRetrievalType retrievalType)
	{
		return fetchData(quoteSymbol, startDate, endDate, retrievalType);
	}
	
	/**
	 * Gets the Historical Data of the Quote Based on the Start Date
	 * @param quoteSymbol The Quote of the Stock
	 * @param startDate The Start Date from where you want to get the Data From
	 * @param retrievalType Whether the Retrieval will return Daily, Weekly or Monthly Data
	 */
	public QuoteHistoricalData getQuoteHistoricalData(String quoteSymbol, Date startDate, IntervalRetrievalType retrievalType)
	{
		return fetchData(quoteSymbol, startDate, null, retrievalType);
	}
	
	/**
	 * Gets the Historical Data of the Quote
	 * @param quoteSymbol The Quote of the Stock
	 * @param retrievalType Whether the Retrieval will return Daily, Weekly or Monthly Data
	 */
	public QuoteHistoricalData getQuoteHistoricalData(String quoteSymbol, IntervalRetrievalType retrievalType)
	{
		return fetchData(quoteSymbol, null, null, retrievalType);
	}
	
	
	
}