import click
import math
from collections import defaultdict
from datetime import datetime, timedelta
from typing import Any, DefaultDict, Dict, List, Sequence, Tuple, Optional

import base32_crockford as base32
import tabulate

import api.projects
import api.stories
from config import Config
from util import require_login

from . import COLOR_HEADER, COLOR_PLANNED, COLOR_STARTED, COLOR_FINISHED, \
              COLOR_DELIVERED, COLOR_ACCEPTED, COLOR_REJECTED, _format_state, \
              _get_persons
from ._stories_info import stories_info
from .cli import cli

STATES = 'unstarted', 'planned', 'started', 'finished', 'delivered', \
         'accepted', 'rejected'


Persons = Dict[int, Dict[str, Any]]
Totals = DefaultDict[int, Dict[str, int]]


def __ceil(value: float) -> int:
    return int(math.ceil(value))


def __get_row(item: Tuple[int, Dict[str, int]], persons: Persons,
              show_accepted: bool) -> Sequence:
    owner_id, points = item
    name = persons[owner_id]['name']

    estimates = [points[state] for state in STATES]

    progress = '[' + \
        COLOR_PLANNED.format('P' * __ceil(points['planned'])) + \
        COLOR_REJECTED.format('R' * __ceil(points['rejected'])) + \
        COLOR_STARTED.format('S' * __ceil(points['started'])) + \
        COLOR_FINISHED.format('F' * __ceil(points['finished'])) + \
        COLOR_DELIVERED.format('D' * __ceil(points['delivered']))

    if show_accepted:
        progress += COLOR_ACCEPTED.format('A' * __ceil(points['accepted']))

    progress += ']'

    return name, (*estimates), sum(estimates), progress


def __format_story(story: Dict[str, Any], persons: Persons, totals: Totals) \
        -> Tuple[str, str, str, str, str, int]:
    code = base32.encode(story['id'])

    is_owner = False
    initials = []
    owner_ids = story.get('owner_ids', [])
    for owner_id in owner_ids:
        value = persons[owner_id]['initials']
        if value == Config['user']['initials']:
            is_owner = True
            value = f'\033[96m{value}\033[97m'
        initials.append(value)

    type_ = story['story_type']

    estimate = story.get('estimate')
    if estimate:
        for owner_id in owner_ids:
            state = story['current_state']
            totals[owner_id][state] += estimate / len(owner_ids)

    if is_owner:
        code = f'\033[1;97m{code}'
        estimate = f'\033[97m{estimate}\033[0m' if estimate else None

    owners = ', '.join(initials)

    state = _format_state(story['current_state'])
    return code, type_, story['name'], owners, state, estimate


def __print_stories(stories_: List[Dict[str, Any]], persons: Persons,
                    totals: Totals, show_accepted: bool) -> None:
    table = (__format_story(story, persons, totals) for story in stories_
             if show_accepted or story['current_state'] != 'accepted')
    headers = 'Code', 'Type', 'Story name', 'Owners', 'State', 'Pts'
    print(tabulate.tabulate(table, headers=headers), end='\n\n')


def __print_totals(totals: Totals, persons: Persons, show_accepted: bool) \
        -> None:
    COLOR_HEADER.print('Point totals:', end='\n\n')

    state_headers = [_format_state(state) for state in STATES]
    headers = ('Owner', *state_headers, 'Total', 'Progress')

    data = sorted((__get_row(item, persons, show_accepted)
                   for item in totals.items()),
                  key=lambda row: row[-2], reverse=True)
    print(tabulate.tabulate(data, headers), end='\n\n')


def __print_burndown(token: str, iteration: Dict[str, Any],
                     show_accepted: bool) -> None:
    COLOR_HEADER.print('Burndown:', end='\n\n')

    start = datetime.strptime(iteration['start'], '%Y-%m-%dT%H:%M:%SZ')
    history = api.projects.get_history_days(
        token, iteration['project_id'], start - timedelta(days=1))

    accepted_points = history['data'][0][1]

    last_counts: List[int] = []
    for date, *counts in history['data'][1:]:
        if len(counts) > 0:
            # Update the last_counts variable if an update is available.
            last_counts = counts
        elif len(last_counts) > 0:
            # If no counts are available, use those of the previous day.
            counts = last_counts
        else:
            # If there are no last_counts either, just skip the day
            continue

        progress = ''

        if show_accepted:
            progress += '\033[92m' + 'A' * round(counts[0] - accepted_points)

        progress += '\033[38;5;208m' + 'D' * round(counts[1])
        progress += '\033[94m' + 'F' * round(counts[2])
        progress += '\033[38;5;226m' + 'S' * round(counts[3])
        progress += '\033[90m' + 'P' * round(counts[5])
        progress += '\033[0m'

        print(f'{date}: {progress}')

    print()


def _stories_current(project: str, scope: str, show_accepted: bool) -> None:
    try:
        project_id = int(Config['project_aliases'][project])
    except KeyError:
        project_id = base32.decode(project)

    token = Config['user']['api_token']

    iterations = api.projects.get_iterations(
        token, project_id, scope=scope)
    if not iterations:
        print('No stories in', scope)
        return
    iteration = iterations[0]

    persons = _get_persons(token, project_id=project_id)
    totals: DefaultDict[int, Dict[str, int]] = \
        defaultdict(lambda: dict((state, 0) for state in STATES))

    __print_stories(iteration['stories'], persons, totals, show_accepted)
    __print_totals(totals, persons, show_accepted)
    if scope == 'current':
        __print_burndown(token, iteration, show_accepted)


def _set_story_state(story: str, state: str) -> None:
    token = Config['user']['api_token']
    story_id = base32.decode(story)
    api.stories.put_story(token, story_id, current_state=state)


@cli.command('stories')
@click.argument('project')
@click.argument('story', required=False)
@click.option('--scope', default='current')
@click.option('--show-accepted/--hide-accepted', default=True)
@click.option('--set-state', type=click.Choice([
    'planned', 'started', 'finished', 'delivered', 'rejected', 'accepted']))
@require_login
def stories(project: str, story: Optional[str], scope: str,
            show_accepted: bool, set_state: str) -> None:
    if story is not None:
        if set_state is not None:
            _set_story_state(story, set_state)

        stories_info(story)
    else:
        _stories_current(project, scope, show_accepted)