'''


@author: shing19m
'''

from datetime import datetime
import sqlite3


class Db(object):
    '''
    classdocs
    '''


    def __init__(self, db_file):
        '''
        Constructor
        '''
        self.db = sqlite3.connect(db_file)
        
    def __del__(self):
        self.db.close()
        
    def getAllPitStops(self):
        return self._perform_query('select * from pitstops order by id asc')
    
    def getAllServices(self):
        return self._perform_query('select * from services')
    
    def getLastPitStop(self):
        pitstops = self._perform_query('select * from pitstops order by id desc limit 1')
        if len(pitstops) == 0:
            return {'date': datetime.strftime(datetime.now(), '%Y-%m-%d'), 'odometer': 0, 'litres': 0}
        return pitstops[0]
    
    def get_service_warning_info(self):
        info = self._perform_query('select (odometer_planned - (select odometer from pitstops order by id desc limit 1)) km_left, tasks from services where date is null order by odometer_planned asc limit 1;')
        if len(info) == 0:
            return None
        return info[0]
    
    def get_next_undone_service(self):
        services = self._perform_query('select * from services where date is null limit 1')
        if len(services) == 0:
            return None
        return services[0]

    def _perform_query(self, query):
        cursor = self.db.execute(query)
        names = list(map(lambda x: x[0], cursor.description))
        result = []
        for row in cursor.fetchall():
            row_result = {}
            for index in range(0, len(names)):
                row_result[names[index]] = row[index]
            result.append(row_result)
        return result
    
    def addPitStop(self, date, odometer, litres):
        self.db.execute('insert into pitstops (date, odometer, litres) values (?, ?, ?)', [date, odometer, litres])
        self.db.commit()

    def init_db(self, resource):
        with resource as f:
            sql_commands = f.read()
            self.db.cursor().executescript(sql_commands)
        self.db.commit()