"""
Inkycal Todoist Module
Copyright by aceinnolab
"""
import arrow
import json
import logging
import requests

from inkycal.modules.template import inkycal_module
from inkycal.custom import *

from todoist_api_python.api import TodoistAPI

logger = logging.getLogger(__name__)

class LoginVikunja():
    def __init__(self, username, password, totp_passcode=None, token=None, api_url='http://192.168.50.10:3456/api/v1/'):
        self.username = username
        self.password = password
        self.totp_passcode = totp_passcode
        self.token = None
        self.api_url = api_url
        self._access_token = token
        if self._access_token is None:
            self._access_token = self.get_token()
    
    def _create_url(self, path):
        return self.api_url + path

    """returns the token from the login request"""
    def _post_login_request(self, username, password, totp_passcode):
        login_url = self._create_url('login')
        payload = {
            'long_token': True,
            'username': username,
            'password': password,
            'totp_passcode': totp_passcode
        }
        return requests.post(login_url, json=payload, timeout=5)
    
    def _get_access_token(self):
        if not self._access_token:
            token_json = self._post_login_request(self.username, self.password, self.totp_passcode)
            if token_json.status_code == 200:
                token = json.loads(token_json.text)
                self._access_token = token['token']
            else:
                raise Exception('Login failed')
        return self._access_token
    
    def get_token(self):
        return self._get_access_token()
    
    def get_headers(self):
        return {'Authorization': 'Bearer ' + self._get_access_token()}

class ApiVikunja():
    def __init__(self, username, password, totp_passcode=None, token=None, api_url='http://192.168.50.10:3456/api/v1/'):
        self.username = username
        self.password = password
        self.totp_passcode = totp_passcode
        self.token = None
        self.api_url = api_url
        self._cache = {'projects': None, 'tasks': None, 'labels': None}
        self._login = LoginVikunja(username, password, totp_passcode, token, api_url)
    def _create_url(self, path):
        return self.api_url + path

    def _to_json(self, response):
        try:
            return response.json()
        except Exception as e:
            logger.error(f'Error parsing json: {e}')
            raise e

    def _get_json(self, url, params=None, headers=None):
        if params is None:
            params = {}
        response = requests.get(url, params=params, headers=headers, timeout=5)
        response.raise_for_status()
        json_result = self._to_json(response)
        total_pages = int(response.headers.get('x-pagination-total-pages', 1))
        if total_pages > 1:
            logger.debug('Trying to get all pages')
            for page in range(2, total_pages + 1):
                logger.debug(f'Getting page {page}')
                params.update({'page': page})
                response = requests.get(url, params=params, headers=headers, timeout=5)
                response.raise_for_status()
                json_result = json_result + self._to_json(response)
        return json_result

    def get_projects(self):
        # if self._cache['projects'] is None:
        self._cache['projects'] = self._get_json(self._create_url('projects'), headers=self._login.get_headers())
        return self._cache['projects']
    
    def get_tasks(self, exclude_completed=True):
        # if self._cache['tasks'] is None:
        url = self._create_url('tasks/all')
        params = {'filter': 'done=false'} if exclude_completed else {}
        self._cache['tasks'] = self._get_json(url, params, headers=self._login.get_headers()) or []
        return self._cache['tasks']

    

class Vikunja(inkycal_module):
    """Todoist api class
    parses todos from the todoist api.
    """

    name = "Vikunja API - show your todos from Vikunja"

    requires = {
        'url-frontend': {
            "label": "Please enter your Vikunja URL",
        },
        'url-backend': {
            "label": "Please enter your Vikunja URL",
        },
        'username': {
            "label": "Please enter your Vikunja username",
        },
        'password': {
            "label": "Please enter your Vikunja password",
        },
    }

    optional = {
        'project_filter': {
            "label": "Show Todos only from following project (separated by a comma). Leave empty to show " +
                     "todos from all projects",
        }
    }

    def __init__(self, config):
        """Initialize inkycal_rss module"""

        super().__init__(config)

        config = config['config']

        # Check if all required parameters are present
        for param in self.requires:
            if param not in config:
                raise Exception(f'config is missing {param}')

        # module specific parameters
        self.frontend_url = config['url-frontend']
        self.backend_url = config['url-backend']

        # if project filter is set, initialize it
        if config['project_filter'] and isinstance(config['project_filter'], str):
            self.project_filter = config['project_filter'].split(',')
        else:
            self.project_filter = config['project_filter']

        # self._api = TodoistAPI(config['api_key'])
        self._vikunja_api = ApiVikunja(config['username'], config['password'], None, None, config['url-backend'])

        # give an OK message
        logger.debug(f'{__name__} loaded')

    def _validate(self):
        """Validate module-specific parameters"""
        if not isinstance(self.api_key, str):
            print('api_key has to be a string: "Yourtopsecretkey123" ')
    
    def get_projects():

        pass

    def generate_image(self):
        """Generate image for this module"""

        # Define new image size with respect to padding
        im_width = int(self.width - (2 * self.padding_left))
        im_height = int(self.height - (2 * self.padding_top))
        im_size = im_width, im_height
        logger.debug(f'Image size: {im_size}')

        # Create an image for black pixels and one for coloured pixels
        im_black = Image.new('RGB', size=im_size, color='white')
        im_colour = Image.new('RGB', size=im_size, color='white')

        # Check if internet is available
        if internet_available():
            logger.info('Connection test passed')
        else:
            logger.error("Network not reachable. Please check your connection.")
            raise NetworkNotReachableError

        # Set some parameters for formatting todos
        line_spacing = 1
        text_bbox_height = self.font.getbbox("hg")
        line_height = text_bbox_height[3] + line_spacing
        line_width = im_width
        max_lines = im_height // line_height

        # Calculate padding from top so the lines look centralised
        spacing_top = int(im_height % line_height / 2)

        # Calculate line_positions
        line_positions = [
            (0, spacing_top + _ * line_height) for _ in range(max_lines)]

        # Get all projects by name and id
        # all_projects = self._api.get_projects()
        # filtered_project_ids_and_names = {project.id: project.name for project in all_projects}
        # all_active_tasks = self._api.get_tasks()
        all_projects = self._vikunja_api.get_projects()
        all_active_tasks = self._vikunja_api.get_tasks()
        all_active_tasks = [task for task in all_active_tasks if task['done'] == False]

        logger.debug(f"all_projects: {all_projects}")
        logger.debug(f"all_active_tasks: {all_active_tasks}")
        print(f"all_projects: {all_projects}")
        print(f"all_active_tasks: {all_active_tasks}")

        # Filter entries in all_projects if filter was given
        if self.project_filter:
            # filtered_projects = [project for project in all_projects if project.name in self.project_filter]
            filtered_projects = [project for project in all_projects if project['title'] in self.project_filter]
            filtered_project_ids_and_names = {project['id']: project['title'] for project in filtered_projects}
            filtered_project_ids = [project for project in filtered_project_ids_and_names]
            logger.debug(f"filtered projects: {filtered_projects}")
            print(f"filtered projects: {filtered_projects}")
            print(f"filtered_project_ids_and_names: {filtered_project_ids_and_names}")
            print(f"filtered_project_ids: {filtered_project_ids}")

            # If filter was activated and no project was found with that name,
            # raise an exception to avoid showing a blank image
            if not filtered_projects:
                logger.error('No project found from project filter!')
                logger.error('Please double check spellings in project_filter')
                raise Exception('No matching project found in filter. Please '
                                'double check spellings in project_filter or leave'
                                'empty')
            # filtered version of all active tasks
            all_active_tasks = [task for task in all_active_tasks if task['project_id'] in filtered_project_ids]

        # Simplify the tasks for faster processing
        simplified = [
            {
                'name': task['title'],
                'due': arrow.get(task['due_date']).format("D-MMM-YY") if 'due_date' in task and task['due_date'][:2] != '00' else "",
                'priority': task['priority'],
                'project': filtered_project_ids_and_names[task['project_id']]
            }
            for task in all_active_tasks
        ]

        logger.debug(f'simplified: {simplified}')
        print(f'simplified: {simplified}')

        project_lengths = []
        due_lengths = []

        for task in simplified:
            if task["project"]:
                project_lengths.append(int(self.font.getlength(task['project']) * 1.1))
            if task["due"]:
                due_lengths.append(int(self.font.getlength(task['due']) * 1.1))

        # Get maximum width of project names for selected font
        project_offset = int(max(project_lengths)) if project_lengths else 0

        # Get maximum width of project dues for selected font
        due_offset = int(max(due_lengths)) if due_lengths else 0

        # create a dict with names of filtered groups
        groups = {group_name:[] for group_name in filtered_project_ids_and_names.values()}
        for task in simplified:
            group_of_current_task = task["project"]
            if group_of_current_task in groups:
                groups[group_of_current_task].append(task)

        logger.debug(f"grouped: {groups}")

        # Add the parsed todos on the image
        cursor = 0
        for name, todos in groups.items():
            if todos:
                for todo in todos:
                    if cursor < max_lines:
                        line_x, line_y = line_positions[cursor]

                        if todo['project']:
                            # Add todos project name
                            write(
                                im_colour, line_positions[cursor],
                                (project_offset, line_height),
                                todo['project'], font=self.font, alignment='left')

                        # Add todos due if not empty
                        if todo['due']:
                            write(
                                im_black,
                                (line_x + project_offset, line_y),
                                (due_offset, line_height),
                                todo['due'], font=self.font, alignment='left')

                        if todo['name']:
                            # Add todos name
                            write(
                                im_black,
                                (line_x + project_offset + due_offset, line_y),
                                (im_width - project_offset - due_offset, line_height),
                                todo['name'], font=self.font, alignment='left')

                        cursor += 1
                    else:
                        logger.error('More todos than available lines')
                        break

        # return the images ready for the display
        return im_black, im_colour