from datetime import datetime
from typing import Any, Dict, Mapping, MutableMapping, Optional, Tuple

from .exceptions import UnknownUpdateCardAction

SUPPORTED_CARD_ACTIONS = [
    u'updateCard',
    u'createCard',
    u'addLabelToCard',
    u'removeLabelFromCard',
    u'addMemberToCard',
    u'removeMemberFromCard',
    u'addAttachmentToCard',
    u'addChecklistToCard',
    u'commentCard'
]

CREATE = u'createCard'
CHANGE_LIST = u'changeList'
CHANGE_NAME = u'changeName'
SET_DESC = u'setDesc'
CHANGE_DESC = u'changeDesc'
REMOVE_DESC = u'removeDesc'
ARCHIVE = u'archiveCard'
REOPEN = u'reopenCard'
SET_DUE_DATE = u'setDueDate'
CHANGE_DUE_DATE = u'changeDueDate'
REMOVE_DUE_DATE = u'removeDueDate'
ADD_LABEL = u'addLabelToCard'
REMOVE_LABEL = u'removeLabelFromCard'
ADD_MEMBER = u'addMemberToCard'
REMOVE_MEMBER = u'removeMemberFromCard'
ADD_ATTACHMENT = u'addAttachmentToCard'
ADD_CHECKLIST = u'addChecklistToCard'
COMMENT = u'commentCard'

TRELLO_CARD_URL_TEMPLATE = u'[{card_name}]({card_url})'

ACTIONS_TO_MESSAGE_MAPPER = {
    CREATE: u'created {card_url_template}.',
    CHANGE_LIST: u'moved {card_url_template} from {old_list} to {new_list}.',
    CHANGE_NAME: u'renamed the card from "{old_name}" to {card_url_template}.',
    SET_DESC: u'set description for {card_url_template} to\n~~~ quote\n{desc}\n~~~\n',
    CHANGE_DESC: (u'changed description for {card_url_template} from\n' +
                  '~~~ quote\n{old_desc}\n~~~\nto\n~~~ quote\n{desc}\n~~~\n'),
    REMOVE_DESC: u'removed description from {card_url_template}.',
    ARCHIVE: u'archived {card_url_template}.',
    REOPEN: u'reopened {card_url_template}.',
    SET_DUE_DATE: u'set due date for {card_url_template} to {due_date}.',
    CHANGE_DUE_DATE: u'changed due date for {card_url_template} from {old_due_date} to {due_date}.',
    REMOVE_DUE_DATE: u'removed the due date from {card_url_template}.',
    ADD_LABEL: u'added a {color} label with \"{text}\" to {card_url_template}.',
    REMOVE_LABEL: u'removed a {color} label with \"{text}\" from {card_url_template}.',
    ADD_MEMBER: u'added {member_name} to {card_url_template}.',
    REMOVE_MEMBER: u'removed {member_name} from {card_url_template}.',
    ADD_ATTACHMENT: u'added [{attachment_name}]({attachment_url}) to {card_url_template}.',
    ADD_CHECKLIST: u'added the {checklist_name} checklist to {card_url_template}.',
    COMMENT: u'commented on {card_url_template}\n~~~ quote\n{text}\n~~~\n'
}

def prettify_date(date_string: str) -> str:
    return date_string.replace('T', ' ').replace('.000', '').replace('Z', ' UTC')

def process_card_action(payload: Mapping[str, Any], action_type: str) -> Optional[Tuple[str, str]]:
    proper_action = get_proper_action(payload, action_type)
    if proper_action is not None:
        return get_subject(payload), get_body(payload, proper_action)
    return None

def get_proper_action(payload: Mapping[str, Any], action_type: str) -> Optional[str]:
    if action_type == 'updateCard':
        data = get_action_data(payload)
        old_data = data['old']
        card_data = data['card']
        if data.get('listBefore'):
            return CHANGE_LIST
        if old_data.get('name'):
            return CHANGE_NAME
        if old_data.get('desc') == "":
            return SET_DESC
        if old_data.get('desc'):
            if card_data.get('desc') == "":
                return REMOVE_DESC
            else:
                return CHANGE_DESC
        if old_data.get('due', False) is None:
            return SET_DUE_DATE
        if old_data.get('due'):
            if card_data.get('due', False) is None:
                return REMOVE_DUE_DATE
            else:
                return CHANGE_DUE_DATE
        if old_data.get('closed') is False and card_data.get('closed'):
            return ARCHIVE
        if old_data.get('closed') and card_data.get('closed') is False:
            return REOPEN
        # we don't support events for when a card is moved up or down
        # within a single list
        if old_data.get('pos'):
            return None
        raise UnknownUpdateCardAction()

    return action_type

def get_subject(payload: Mapping[str, Any]) -> str:
    return get_action_data(payload)['board'].get('name')

def get_body(payload: Mapping[str, Any], action_type: str) -> str:
    message_body = ACTIONS_TO_FILL_BODY_MAPPER[action_type](payload, action_type)
    creator = payload['action']['memberCreator'].get('fullName')
    return u'{full_name} {rest}'.format(full_name=creator, rest=message_body)

def get_added_checklist_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'checklist_name': get_action_data(payload)['checklist'].get('name'),
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_added_attachment_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'attachment_url': get_action_data(payload)['attachment'].get('url'),
        'attachment_name': get_action_data(payload)['attachment'].get('name'),
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_updated_card_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'card_name': get_card_name(payload),
        'old_list': get_action_data(payload)['listBefore'].get('name'),
        'new_list': get_action_data(payload)['listAfter'].get('name'),
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_renamed_card_body(payload: Mapping[str, Any], action_type: str) -> str:

    data = {
        'old_name': get_action_data(payload)['old'].get('name'),
        'new_name': get_action_data(payload)['old'].get('name'),
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_added_label_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'color': get_action_data(payload).get('value'),
        'text': get_action_data(payload).get('text'),
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_managed_member_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'member_name': payload['action']['member'].get('fullName')
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_comment_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'text': get_action_data(payload)['text'],
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_managed_due_date_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'due_date': prettify_date(get_action_data(payload)['card'].get('due'))
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_changed_due_date_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'due_date': prettify_date(get_action_data(payload)['card'].get('due')),
        'old_due_date': prettify_date(get_action_data(payload)['old'].get('due'))
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_managed_desc_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'desc': prettify_date(get_action_data(payload)['card']['desc'])
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_changed_desc_body(payload: Mapping[str, Any], action_type: str) -> str:
    data = {
        'desc': prettify_date(get_action_data(payload)['card']['desc']),
        'old_desc': prettify_date(get_action_data(payload)['old']['desc'])
    }
    return fill_appropriate_message_content(payload, action_type, data)

def get_body_by_action_type_without_data(payload: Mapping[str, Any], action_type: str) -> str:
    return fill_appropriate_message_content(payload, action_type)

def fill_appropriate_message_content(payload: Mapping[str, Any],
                                     action_type: str,
                                     data: Optional[Dict[str, Any]]=None) -> str:
    data = {} if data is None else data
    data['card_url_template'] = data.get('card_url_template', get_filled_card_url_template(payload))
    message_body = get_message_body(action_type)
    return message_body.format(**data)

def get_filled_card_url_template(payload: Mapping[str, Any]) -> str:
    return TRELLO_CARD_URL_TEMPLATE.format(card_name=get_card_name(payload), card_url=get_card_url(payload))

def get_card_url(payload: Mapping[str, Any]) -> str:
    return u'https://trello.com/c/{}'.format(get_action_data(payload)['card'].get('shortLink'))

def get_message_body(action_type: str) -> str:
    return ACTIONS_TO_MESSAGE_MAPPER[action_type]

def get_card_name(payload: Mapping[str, Any]) -> str:
    return get_action_data(payload)['card'].get('name')

def get_action_data(payload: Mapping[str, Any]) -> Mapping[str, Any]:
    return payload['action'].get('data')

ACTIONS_TO_FILL_BODY_MAPPER = {
    CREATE: get_body_by_action_type_without_data,
    CHANGE_LIST: get_updated_card_body,
    CHANGE_NAME: get_renamed_card_body,
    SET_DESC: get_managed_desc_body,
    CHANGE_DESC: get_changed_desc_body,
    REMOVE_DESC: get_body_by_action_type_without_data,
    ARCHIVE: get_body_by_action_type_without_data,
    REOPEN: get_body_by_action_type_without_data,
    SET_DUE_DATE: get_managed_due_date_body,
    CHANGE_DUE_DATE: get_changed_due_date_body,
    REMOVE_DUE_DATE: get_body_by_action_type_without_data,
    ADD_LABEL: get_added_label_body,
    REMOVE_LABEL: get_added_label_body,
    ADD_MEMBER: get_managed_member_body,
    REMOVE_MEMBER: get_managed_member_body,
    ADD_ATTACHMENT: get_added_attachment_body,
    ADD_CHECKLIST: get_added_checklist_body,
    COMMENT: get_comment_body,
}