import argparse
import copy
import pathlib
import sys

import teachingdates.calendars as calendars
import teachingdates.config as configuration
from teachingdates import PROG


def run():
    args = configuration.parse_command_line()
    if args.debug:
        print("{prog}: debug: args: {a}".format(prog=PROG, a=args))

    try:
        dates_config = configuration.Configuration(args)
        if args.debug:
            print("{prog}: debug: period config: {c}".format(
                prog=PROG, c=dates_config.get_period_config()))
            print("{prog}: debug: paper config: {c}".format(
                prog=PROG, c=dates_config.get_paper_config()))
        cal = calendars.TeachingCalendar.from_configuration(dates_config)
        print("Period = {p}".format(p=args.period))
        print(cal.calendar())
        print(cal.lecture_dates())

    except configuration.ConfigurationError as e:
        print("{prog}: error: failed to load configuration from "
              "'{file}'.".format(prog=PROG, file=e))
    except configuration.PaperKeyError as e:
        print("{prog}: error: paper '{paper}' in '{file}' is missing "
              "required key '{key}'.".format(prog=PROG,
                                             paper=e.parent,
                                             file=e.file,
                                             key=e.key))
    except configuration.PeriodKeyError as e:
        print("{prog}: error: teaching period '{period}' in '{file}' is "
              "missing required key '{key}'.".format(prog=PROG,
                                                     period=e.parent,
                                                     file=e.file,
                                                     key=e.key))
    except configuration.PaperError as e:
        print("{prog}: error: no entry for paper '{paper}' ({period}) in "
              "'{file}.'".format(prog=PROG,
                                 file=e,
                                 paper=args.paper,
                                 period=args.period))
    except configuration.PeriodError as e:
        print("{prog}: error: no entry for teaching period '{period}' in "
              "'{file}'.".format(prog=PROG, file=e, period=args.period))