import argparse
import copy
import pathlib
import sys

from jinja2 import TemplateNotFound

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(dates_config)
        if args.debug:
            print("Calendars: {cal}".format(cal=cal.calendars))
            print("{cls}: {dates}".format(
                cls=dates_config.style.title() + "s",
                dates=cal.class_dates()))
        print(cal.render(args.style, args.format))

    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))
    except TemplateNotFound as e:
        print("{prog}: error: no template found for output style '{style}' "
              "and output format '{format}' (expected {file})".format(
                  prog=PROG, style=args.style, format=args.format, file=e))