# Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.

from __future__ import absolute_import
from __future__ import division
from __future__ import print_function
from __future__ import unicode_literals

import json
import logging
import os
import requests
from prompt_toolkit import prompt
from prompt_toolkit.history import InMemoryHistory

WIT_API_HOST = os.getenv('WIT_URL', 'https://api.wit.ai')
WIT_API_VERSION = os.getenv('WIT_API_VERSION', '20200513')
INTERACTIVE_PROMPT = '> '
LEARN_MORE = 'Learn more at https://wit.ai/docs/quickstart'


class WitError(Exception):
    pass


def req(logger, access_token, meth, path, params, **kwargs):
    full_url = WIT_API_HOST + path
    logger.debug('%s %s %s', meth, full_url, params)
    headers = {
        'authorization': 'Bearer ' + access_token,
        'accept': 'application/vnd.wit.' + WIT_API_VERSION + '+json'
    }
    headers.update(kwargs.pop('headers', {}))
    rsp = requests.request(
        meth,
        full_url,
        headers=headers,
        params=params,
        **kwargs
    )
    if rsp.status_code > 200:
        raise WitError('Wit responded with status: ' + str(rsp.status_code) +
                       ' (' + rsp.reason + ')')
    json = rsp.json()
    if 'error' in json:
        raise WitError('Wit responded with an error: ' + json['error'])

    logger.debug('%s %s %s', meth, full_url, json)
    return json


class Wit(object):
    access_token = None
    _sessions = {}

    def __init__(self, access_token, logger=None):
        self.access_token = access_token
        self.logger = logger or logging.getLogger(__name__)

    def message(self, msg, context=None, n=None, verbose=None):
        params = {}
        if n is not None:
            params['n'] = n
        if msg:
            params['q'] = msg
        if context:
            params['context'] = json.dumps(context)
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'GET', '/message', params)
        return resp

    def speech(self, audio_file, headers=None, verbose=None):
        """ Sends an audio file to the /speech API.
        Uses the streaming feature of requests (see `req`), so opening the file
        in binary mode is strongly recommended (see
        http://docs.python-requests.org/en/master/user/advanced/#streaming-uploads).
        Add Content-Type header as specified here: https://wit.ai/docs/http/20200513#post--speech-link

        :param audio_file: an open handler to an audio file
        :param headers: an optional dictionary with request headers
        :param verbose: for legacy versions, get extra information
        :return:
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        resp = req(self.logger, self.access_token, 'POST', '/speech', params,
                   data=audio_file, headers=headers)
        return resp

    def interactive(self, handle_message=None, context=None):
        """Runs interactive command line chat between user and bot. Runs
        indefinitely until EOF is entered to the prompt.

        handle_message -- optional function to customize your response.
        context -- optional initial context. Set to {} if omitted
        """
        if context is None:
            context = {}

        history = InMemoryHistory()
        while True:
            try:
                message = prompt(INTERACTIVE_PROMPT, history=history, mouse_support=True).rstrip()
            except (KeyboardInterrupt, EOFError):
                return
            if handle_message is None:
                print(self.message(message, context))
            else:
                print(handle_message(self.message(message, context)))

    def intent_list(self, headers=None, verbose=None):
        """
        Returns names of all intents associated with your app.
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        resp = req(self.logger, self.access_token, 'GET', '/intents', params, headers=headers)
        return resp 
    
    def detect_language(self, msg, n=None, headers=None, verbose=None):
        """
        Returns the list of the top detected locales for the text message.
        """
        params = {}
        headers = headers or {}
        if msg:
            params['q'] = msg
        if verbose:
            params['verbose'] = True
        if n is not None:
            params['n'] = n    
        resp = req(self.logger, self.access_token, 'GET', '/language', params, headers=headers)
        return resp    

    def intent_info(self, intent_name, headers=None, verbose=None):
        """
        Returns all available information about an intent.

        :param intent_name: name of existing intent
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/intents/' + intent_name    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def entity_list(self, headers=None, verbose=None):
        """
        Returns list of all entities associated with your app.
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        resp = req(self.logger, self.access_token, 'GET', '/entities', params, headers=headers)
        return resp

    def entity_info(self, entity_name, headers=None, verbose=None):
        """
        Returns all available information about an entity.

        :param entity_name: name of existing entity
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/entities/' + entity_name    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def trait_list(self, headers=None, verbose=None):
    	"""
    	Returns list of all traits associated with your app.
    	"""
    	params = {}
    	headers = headers or {}
    	if verbose:
    		params['verbose'] = True
    	resp = req(self.logger, self.access_token, 'GET', '/traits', params, headers=headers)
    	return resp

    def trait_info(self, trait_name, headers=None, verbose=None):
        """
        Returns all available information about a trait.

        :param trait_name: name of existing trait
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/traits/' + trait_name    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def delete_intent(self, intent_name, headers=None, verbose=None):
        """
        Delete an intent associated with your app.

        :param intent_name: name of intent to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/intents/' + intent_name    
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_entity(self, entity_name, headers=None, verbose=None):
        """
        Delete an entity associated with your app.

        :param entity_name: name of entity to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/entities/' + entity_name    
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_role(self, entity_name, role_name, headers=None, verbose=None):
        """
        Deletes a role associated with the entity.
		
		:param entity_name: name of entity whose particular role is to be deleted
        :param role_name: name of role to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/entities/' + entity_name + ":" + role_name   
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_keyword(self, entity_name, keyword_name, headers=None, verbose=None):
        """
        Deletes a keyword associated with the entity.
		
		:param entity_name: name of entity whose particular keyword is to be deleted
        :param keyword_name: name of keyword to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/entities/' + entity_name + "/keywords/" + keyword_name   
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_synonym(self, entity_name, keyword_name, synonym_name, headers=None, verbose=None):
        """
        Delete a synonym of the keyword of the entity.
		
		:param entity_name: name of entity whose particular keyword is to be deleted
        :param keyword_name: name of keyword to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/entities/' + entity_name + "/keywords/" + keyword_name + "/synonyms/" + synonym_name  
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_trait(self, trait_name, headers=None, verbose=None):
        """
        Delete a trait associated with your app.

        :param intent_name: name of intent to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/traits/' + trait_name    
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def delete_trait_value(self, trait_name, value_name, headers=None, verbose=None):
        """
        Deletes a value associated with the trait.
		
		:param trait_name: name of trait whose particular value is to be deleted
        :param value_name: name of value to be deleted
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/traits/' + trait_name + "/values/" + value_name   
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def get_utterances(self, limit, offset=None, intents=None, headers=None, verbose=None):
        """
        Returns a JSON array of utterances.
		
		:param limit: number of utterances to return
        :param offset: number of utterances to skip
        :param intents: list of intents to filter the utterances
        """
        params = {}
        headers = headers or {}
        if limit is not None:
            params['limit'] = limit
        if offset:
            params['offset'] = offset
        if intents:
            params['intents'] = intents
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'GET', '/utterances', params)
        return resp

    def delete_utterances(self, utterances, headers=None, verbose=None):
        """
        Delete utterances from your app.
		
		:param utterances: list of utterances to be deleted
        """
        params = {}
        headers = headers or {}    
        data = []
        for utterance in utterances:
        	data.append({"text":utterance})
        if verbose:
            params['verbose'] = verbose	
        resp = req(self.logger, self.access_token, 'DELETE', '/utterances', params, json=data , headers=headers)
        return resp

    def get_apps(self, limit, offset=None, headers=None, verbose=None):
        """
        Returns an array of all your apps.
		
		:param limit: number of apps to return
        :param offset: number of utterances to skip
        """
        params = {}
        headers = headers or {}
        if limit is not None:
            params['limit'] = limit
        if offset:
            params['offset'] = offset
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'GET', '/apps', params)
        return resp

    def app_info(self, app_id, headers=None, verbose=None):
        """
        Returns an object representation of the specified app.

        :param app_id: ID of existing app
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/apps/' + app_id    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def delete_app(self, app_id, headers=None, verbose=None):
        """
        Returns an object representation of the specified app.

        :param app_id: ID of existing app
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/apps/' + app_id    
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def app_versions(self, app_id, headers=None, verbose=None):
        """
        Returns an array of all tag groups for an app.

        :param app_id: ID of existing app
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/apps/' + app_id + '/tags'    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def app_version_info(self, app_id, tag_id, headers=None, verbose=None):
        """
        Returns an object representation of the specified app.

        :param app_id: ID of existing app
        :param tag_id: name of tag
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True
        endpoint = '/apps/' + app_id + "/tags/" + tag_id    
        resp = req(self.logger, self.access_token, 'GET', endpoint, params, headers=headers)
        return resp

    def create_app_version(self, app_id, tag_name, headers=None, verbose=None):
        """
        Create a new version of your app.
		
		:param app_id: ID of existing app
		:param tag_name: name of tag
        """
        params = {}
        headers = headers or {}    
        data = {"tag":tag_name}
        endpoint = '/apps/' + app_id + "/tags/"
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def delete_app_version(self, app_id, tag_name, headers=None, verbose=None):
        """
        Delete a specific version of your app.
		
		:param app_id: ID of existing app
		:param tag_name: name of tag
        """
        params = {}
        headers = headers or {}    
        endpoint = '/apps/' + app_id + "/tags/" + tag_name
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'DELETE', endpoint, params, headers=headers)
        return resp

    def export(self, headers=None, verbose=None):
        """
        Get a URL where you can download a ZIP file containing all of your app data.
        """
        params = {}
        headers = headers or {}
        if verbose:
            params['verbose'] = True   
        resp = req(self.logger, self.access_token, 'GET', '/export', params, headers=headers)
        return resp

    def import_app(self, name, private, zip_file, headers=None, verbose=None):
        """
        Create a new app with all the app data from the exported app.
		
		:param name: name of the new app
        :param private: private if true
        """
        params = {}
        headers = headers or {}
        if name is not None:
            params['name'] = name
        if private:
            params['private'] = private
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', '/import', params, data=zip_file)
        return resp

    def create_intent(self, intent_name, headers=None, verbose=None):
        """
        Creates a new intent with the given attributes.
		
		:param intent_name: name of intent to be created
        """
        params = {}
        headers = headers or {}    
        data = {"name":intent_name}
        endpoint = '/intents'
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def create_entity(self, entity_name, roles, lookups=None, headers=None, verbose=None):
        """
        Creates a new intent with the given attributes.
		
		:param entity_name: name of entity to be created
		:param roles: list of roles you want to create for the entity
		:param lookups:  list of lookup strategies
        """
        params = {}
        headers = headers or {}    
        data = {"name":entity_name, "roles":roles}
        endpoint = '/entities'
        if lookups:
            data['lookups'] = lookups        
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def update_entity(self, current_entity_name, new_entity_name, roles, lookups=None, headers=None, verbose=None):
        """
        Updates the attributes of an entity.
		
		:param entity_name: name of entity to be updated
		:param roles: updated list of roles
		:param lookups:  updated list of lookup strategies
        """
        params = {}
        headers = headers or {}    
        data = {"name":new_entity_name, "roles":roles}
        endpoint = '/entities/' + current_entity_name
        if lookups:
            data['lookups'] = lookups        
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'PUT', endpoint, params, json=data , headers=headers)
        return resp

    def add_keyword_value(self, entity_name, data, headers=None, verbose=None):
        """
        Add a possible value into the list of keywords for the keywords entity.
		
		:param entity_name: name of entity to which keyword is to be added
        """
        params = {}
        headers = headers or {}    
        endpoint = '/entities/' + entity_name + "/keywords"    
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def create_synonym(self, entity_name, keyword_name, synonym, headers=None, verbose=None):
        """
        Create a new synonym of the canonical value of the keywords entity.
		
		:param entity_name: name of entity to which synonym is to be added
		:param keyword_name: name of keyword to which synonym is to be added
		:param synonym: name of synonym to be created
        """
        params = {}
        headers = headers or {}    
        endpoint = '/entities/' + entity_name + "/keywords/" + keyword_name + "/synonyms" 
        data = {"synonym":synonym}   
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def create_trait(self, trait_name, values, headers=None, verbose=None):
        """
        Creates a new trait with the given attributes.
		
		:param trait_name: name of trait to be created
		:param values: list of values for the trait
        """
        params = {}
        headers = headers or {}    
        data = {"name":trait_name, "values":values}
        endpoint = '/traits'
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def create_trait_value(self, trait_name, new_value, headers=None, verbose=None):
        """
        Creates a new trait with the given attributes.
		
		:param trait_name: name of trait to which new value is to be added
		:param new_value: name of new trait value
        """
        params = {}
        headers = headers or {}    
        data = {"value":new_value}
        endpoint = '/traits/' + trait_name + "/values"
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def train(self, data, headers=None, verbose=None):
        """
        Train your utterances.
		
		:param data: array of utterances with required arguments
        """
        params = {}
        headers = headers or {}    
        endpoint = '/utterances'       
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def create_app(self, app_name, lang, private, timezone=None, headers=None, verbose=None):
        """
        Creates a new app for an existing user.
		
		:param app_name: name of new app
		:param lang: language code in ISO 639-1 format
		:param private: private if true
		:param timezone: default timezone of the app
        """
        params = {}
        headers = headers or {}    
        data = {"name":app_name, "lang":lang, "private":private}
        endpoint = '/apps'
        if timezone:
            params['timezone'] = timezone
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'POST', endpoint, params, json=data , headers=headers)
        return resp

    def update_app(self, app_id, app_name=None, lang=None, private=None, timezone=None, headers=None, verbose=None):
        """
        Updates existing app with given attributes.
		
		:param app_name: new_name
		:param lang: language code in ISO 639-1 format
		:param private: private if true
		:param timezone: default timezone of the app
        """
        params = {}
        headers = headers or {}    
        data = {}
        endpoint = '/apps/' + app_id
        if app_name:
            data['name'] = app_name
        if lang:
            data['lang'] = lang 
        if private:
            data['private'] = private       
        if timezone:
            data['timezone'] = timezone
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'PUT', endpoint, params, json=data , headers=headers)
        return resp

    def update_app_version(self, app_id, tag_name, new_name=None, desc=None, move_to=None, headers=None, verbose=None):
        """
        Update the tag's name or description, or move the tag to point to another tag.
		
		:param app_id: ID of existing app
		:param tag_name: name of existing tag
		:param new_name: name of new tag
		:param desc: new description of tag
		:param move_to: new name of tag
        """
        params = {}
        headers = headers or {}    
        data = {}
        endpoint = '/apps/' + app_id + "/tags/" + tag_name
        if new_name:
            data['tag'] = new_name
        if desc:
            data['desc'] = desc 
        if move_to:
            data['move_to'] = move_to
        if verbose:
            params['verbose'] = verbose
        resp = req(self.logger, self.access_token, 'PUT', endpoint, params, json=data , headers=headers)
        return resp