# -*- coding: utf-8 -*-
import datetime
import json
import re

from math import ceil, floor
from dateutil.parser import parse


fullformat = lambda dt: dt.strftime('%Y-%m-%d %H:%M:%S')
hourformat = lambda dt: dt.strftime('%H:%M')


def compute_remaining(start, end):
    if not isinstance(start, datetime.datetime):
        raise ValueError("start needs to be a datetime.datetime")
    if not isinstance(end, datetime.datetime):
        raise ValueError("start needs to be a datetime.datetime")
    seconds = (end - start).total_seconds()
    return datetime.timedelta(minutes=floor(seconds / 60)).total_seconds()


class QueryApi(object):

    def __init__(self):
        pass

    def call(self):
        raise NotImplementedError("The inheriting class needs to implement "
                                  "the call() method!")


class Departure(object):

    def __init__(self, start, end, when, line, since=None):
        if since is None:
            self.now = datetime.datetime.now()
        else:
            self.now = since

        self.start = start
        self.end = end
        self.line = line
        if isinstance(when, (int, float)):
            # We assume to get a UNIX / POSIX timestamp
            self.when = datetime.datetime.fromtimestamp(when)
        elif isinstance(when, str):
            self.when = parse(re.sub('[\s*]$', '', when))
            #if (self.when - self.now).total_seconds() < -60:
            #    self.when = self.when + timedelta(days=1)
        elif isinstance(when, datetime.datetime):
            self.when = when
        else:
            raise TypeError("when must be a valid datetime, timestamp or "
                            "string!")

    def __str__(self):
        return "Start: %s, End: %s, when: %s, now: %s, line: %s" % (
            self.start, self.end, hourformat(self.when),
            hourformat(self.now), self.line)

    @property
    def remaining(self):
        return compute_remaining(self.now, self.when)

    @property
    def to_json(self):
        return json.dumps({'start': self.start,
                           'end': self.end,
                           'line': self.line,
                           'now_full': fullformat(self.now),
                           'now_hour': hourformat(self.now),
                           'when_full': fullformat(self.when),
                           'when_hour': hourformat(self.when),
                           'remaining': round(self.remaining)})