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

from zerver.lib.exceptions import UnexpectedWebhookEventType

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

IGNORED_CARD_ACTIONS = [
    'createCheckItem',
]

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

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

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

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 UnexpectedWebhookEventType("Trello", action_type)

    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 '{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_update_check_item_body(payload: Mapping[str, Any], action_type: str) -> str:
    action = get_action_data(payload)
    state = action['checkItem']['state']
    data = {
        'action': 'checked' if state == 'complete' else 'unchecked',
        'checklist_name': action['checklist'].get('name'),
        'item_name': action['checkItem'].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 '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,
    UPDATE_CHECK_ITEM_STATE: get_update_check_item_body,
}