import urllib
import csv
import psycopg2
from sys import argv
from os.path import basename, splitext

def yahooCsv(name):
    params = urllib.urlencode({ "s" : name,
                                "a" : 0,
                                "b" : 1,
                                "c" : 1990,
                                "d" : 11,
                                "e" : 30,
                                "f" : 2010,
                                "g" : "d",
                                "ignore" : ".csv" })
    handler = urllib.urlopen("http://ichart.finance.yahoo.com/table.csv?{}"
                             .format(params))
    return csv.DictReader(handler)

def addTickerHistory(name, handler, cursor, conn):
    cursor.execute("SELECT stockid FROM stock WHERE ticker=%s",(name,))
    if cursor.rowcount == 0:
        cursor.execute("INSERT INTO stock(ticker) VALUES (%s) RETURNING stockid",(name,))
        id = cursor.fetchone()[0]
    else:
        id = cursor.fetchone()[0] 

    def clean(field):
        if field == "NA":
            return None
        else:
            return field

    for row in handler:
        for (key, value) in row.items():
            row[key] = clean(value)

        cursor.execute("INSERT INTO history(date, stockID, open, high, low,"
                       "close, volume, adjClose, div, adjDiv, split) "
                       "VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)",
                       (row['Date'], id, row['Open'], row['High'], row['Low'],
                        row['Unadj.Close'], row['Volume'], row['Close'],
                        row['Div'], row['Adj.Div'], row['Split'] ) )
        
    conn.commit()
        
if __name__ == '__main__':

    if len(argv) != 5:
        print argv[0], "<database> <user> <passwd> <filename>"
        exit(1)

    database = argv[1]
    user =  argv[2]
    password = argv[3]
    conn = psycopg2.connect(database=database, user=user, password=password)
    cursor = conn.cursor()

    filename = argv[4]
    handler = open(filename,"r")
    ticker = splitext(basename(filename))[0] #get the ticker from the filename
    csvHandler = csv.DictReader(handler)
    
    addTickerHistory(ticker, csvHandler, cursor, conn)

    cursor.close()
    conn.close()
    handler.close()