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import sqlite3

DB_FILE = 'database.db'

def db_init():
    """
    Initialize the sqlite3 database if it doesn't exist or the tables are
    missing..
    :return: n/a
    """
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    c.execute(
            'CREATE TABLE if not exists results \
            (tag text, num integer, status text')
    
    conn.commit()
    conn.close()

def db_write(tag, num, status):
    global DEBUG
    """
    Writes results from a single boot to the database.
    :param data: Data to write.
    :param boot: Boot count.
    :return: n/a
    """
    conn = sqlite3.connect(DB_FILE)
    c = conn.cursor()

    row = (tag, num, status)

    c.execute('INSERT INTO results VALUES (?, ?, ?)', row)
    conn.commit()
    conn.close()
    
def db_read(key, filter_value):
    if not os.path.isfile(DB_FILE):
      print('No db file detected!')
      exit()
        
    conn = sqlite3.connect(DB_FILE)
    conn.row_factory = sqlite3.Row

    c = conn.cursor()

    cmd = 'SELECT * FROM results'
    if key != '':
      cmd = cmd + ' WHERE tag = \"%s\" ' % key
      
    try:
        c.execute(cmd)
    except sqlite3.OperationalError:
        print cmd
    tbl = from_db_cursor(c)
    print(tbl)
    
    conn.close()
    
  def db_delete_tag(key):
      conn = sqlite3.connect(DB_FILE)
      conn.row_factory = sqlite3.Row
      c = conn.cursor()
  
      if DEBUG: print('Deleting %s from database' % key)
      c.execute('DELETE FROM results WHERE tag = \'%s\'' % key)
  
      conn.commit()
      conn.close()