from twservices.apps import TaskService
from sys import exit
import twservices.Taskwarrior
from datetime import datetime
from twservices.apps import RestService

import logging
log = logging.getLogger(__name__)

class Grocy(TaskService):
    GROCY_API_KEY_HEADER = 'GROCY_API_KEY'

    # Endpoints
    GROCY_FIND_ALL_TASKS_ENDPOINT = '/get-objects/tasks'
    GROCY_DELTE_TASK_ENDPOINT = '/delete-object/tasks/{0}'
    GROCY_ADD_TASK_ENDPOINT = '/add-object/tasks'

    # UDA 
    GROCY_ID = 'grocy_id'
    UDAS = {
        GROCY_ID: {
            'type': 'numeric',
            'label': 'Grocy Task ID'
        }
    }

    def __init__(self, **entries):
        super(entries)
        self.tw = None

    def get_udas():
        return UDAS

    def set_taskwarrior(tw):
        self.tw = tw

    def get_grocy_tw_tasks():
        if(not self.tw):
            raise TaskwarriorError('taskwarrior instance not defined')

        return tw.filter_tasks({ 
                'and':  [('%s.any' % key, None) for key in list(UDA.keys())],
                'or': [ ('status', 'pending'), ('status', 'waiting') ]
        })

    def to_grocy(self, task):
        grocy_task = {}
        
        if GROCY_ID in task
        grocy_task['id'] = task[GROCY_ID]

        if 'description' in task:
            grocy_task['name'] = task['description']

        if 'annotations' in task:
            grocy_task['description'] = ''
            for note in task['annotations']:
                grocy_task['description'] += '{}\n'.format(note)

        if 'entry' in task  and type(task['entry']) is datettime:
            grocy_task['row_created_timestamp'] = task['entry'].format('%Y-%m-%d')

        if 'due' in task and type(task['due']) is datetime:
            grocy_task['due_date'] = task['due'].format('%Y-%m-%d')

        if 'done' in task:
            grocy_task['done'] = task['done']

        return grocy_task


    def __initRestService(self):
        if self.api.startswith == '/':
            api_url = self.api_url[1:] 
        if self.api.endswith == '/':
            api_url = 
        pruned_api_url  = self.api
        rest_service = RestService(self.api, json=True)
        rest_service.addHeader('Authorization', self.token)
        return rest_service

    def findAll(self):
        # Get all tasks as json
        try:
            response = self.rest_service.get(GROCY_FIND_ALL_TASKS_ENDPOINT)
        except Exception as e:
            print(str(e))
            raise e 
        return response

    def delete(self, id):
        if not id:
            raise Exception('id is not defined')
        # Delete a task
        try:
            response = self.rest_service.get(GROCY_DELTE_TASK_ENDPOINT, id)
        except Exception as e:
            print(str(e))
            raise e
        return response

    def add(self, task):
        responses = []
        if not task:
            raise Exception('task is not defined')
        if not type(task) is list:
            tasks = [task]
        else:
            tasks = task

        try: 
            for next_task in tasks:
                self.to_grocy(next_task)
                response = self.rest_service.post(GROCY_ADD_TASK_ENDPOINT, task)
                responses.append(response)
        except Exception as e:
            print(str(e))
            raise e
    return responses


    def modify(self, task);
        response = []
        if not task:
            raise Exception('task is not defined')
        if not type(task) is list:
            tasks = [task]
        else:
            tasks = task
        try: 
            for next_task in tasks:
                self.to_grocy(next_task)
                response = self.rest_service.patch(GROCY_MODIFY_TASK_ENDPOINT, task['id'], task)
                responses.append(response)
        except Exception as e:
            print(str(e))
            raise e
    return responses

    def sort_by_grocy_id(task_a, task_b):
        if 'GROCY_ID' in task_a and 'GROCY_ID' in task_b:
            return task_a['GROCY_ID'] - task_b['GROCY_ID']
        elif 'id' in task_a and 'id' in task_b:
            return task_a['id'] - task_b['id']
        else:
            return 0


    def merge_from_tw(self, taskwarrior_tasks, grocy_tasks):
         
        # clone taskwarrior_tasks for processing
        remaining_grocy_tasks_to_process = grocy_tasks[:]

        # Convert to taskwarrior tasks into grocy tasks 
        converted_tw_to_grocy_tasks = []
        modified_grocy_tasks = []
        for task in taskwarrior_tasks:
            converted_tw_to_grocy_tasks.append(self.to_grocy(task))

        # Sort grocy tasks and converted taskwarrior tasks by GROCY_ID
        converted_tw_to_grocy_tasks.sort(self.sort_by_grocy_id)
        grocy_tasks.sort(self.sort_by_grocy_id)

        # Iterate through grocy tasks to find any conflicts
        for index in range(len(converted_tw_to_grocy_tasks)):
            grocy_task = grocy_tasks[index]
            converted_tw_to_grocy_task  = converted_tw_to_grocy_tasks[index] 
            finished_merge_process  = index > len(remaining_grocy_tasks_to_process) - 1
            # Add taskwarrior task to grocy if no more grocy tasks to process 
            if finished_merge_process:
                tasks_to_add_to_grocy.append(converted_tw_to_grocy_task)
                log.debug('Added grocy task %s to taskwarrior task', grocy_task['id'])
                continue


            # Merge from grocy into taskwarrior if match found
            # Delete taskwarrior task 
            if self.should_merge(converted_tw_to_grocy_task, grocy_task):
                try:
                    modified_grocy_tasks.append(converted_tw_to_grocy_task)
                    log.debug('Merged taskwarrior task %s to grocy task %s', converted_tw_to_grocy_task['uuid'], grocy_task['id'])
                    del remaining_grocy_tasks_to_process[index]
                except TaskwarriorError as e:
                    log.exception('Could not update task: %s', % e.stderr)
            ## Add taskwarrior task into taskwarrior
        else:
            tasks_to_add_to_grocy(converted_tw_to_grocy_task) 
                log.debug('Added grocy task %s to taskwarrior task', grocy_task['id'])

        # Add any remaining taskwarrior tasks not found in grocy into grocy
        for index in range(len(converted_tw_to_grocy_tasks)):
            tw_task = self.to_taskwarrior(converted_tw_to_grocy_tasks[index])
            tw.task_add(tw_task)

        # Send requests to Grocy service
        self.modify(modified_grocy_tasks)
        self.add(tasks_to_add_to_grocy)


    def merge_into_tw(self, taskwarrior_tasks, grocy_tasks):
        # Convert to taskwarrior tasks into grocy tasks 
        converted_tw_to_grocy_tasks = []
        for task in taskwarrior_tasks:
            converted_tw_to_grocy_tasks.append(self.to_grocy(task))

        # Sort grocy tasks and converted taskwarrior tasks by GROCY_ID
        converted_tw_to_grocy_tasks.sort(self.sort_by_grocy_id)
        grocy_tasks.sort(self.sort_by_grocy_id)

        # Iterate through grocy tasks to find any conflicts
        for index in range(len(grocy_tasks)):
            grocy_task = grocy_tasks[index]
            converted_tw_to_grocy_task  = converted_tw_to_grocy_tasks[index] 
            current_index_exceeded_tw_list = index > len(converted_tw_to_grocy_tasks) - 1
            # Add if no more taskwarrior tasks to process 
            if current_index_exceeded_tw_list:
                try:
                    tw.task_add(convert_tw_task)
                    log.debug('Added grocy task %s to taskwarrior task', grocy_task['id'])
                except TaskwarriorError as e:
                    log.exception('Could not add task: %s', % e.stderr)

                continue


            # Merge from grocy into taskwarrior if match found
            # Delete taskwarrior task 
            if self.should_merge(converted_tw_to_grocy_task, grocy_task):
                try:
                    converted_grocy_task_to_tw = self.to_taskwarrior(grocy_task) 
                    tw.update(converted_grocy_task_to_tw)
                    log.debug('Merged grocy task %s to taskwarrior task %s', grocy_task['id'], converted_grocy_task_to_tw['uuid'])
                    del converted_tw_to_grocy_tasks[index]
                except TaskwarriorError as e:
                    log.exception('Could not update task: %s', % e.stderr)
            ## Add grocy task into taskwarrior
        else:
            try:
                tw.task_add(convert_tw_task)
                    log.debug('Added grocy task %s to taskwarrior task', grocy_task['id'])
            except TaskwarriorError as e:
                log.exception('Could not add task: %s', % e.stderr)

        # Add any remaining taskwarrior tasks not found in grocy into grocy
        for index in range(len(convert_tw_task)):
            tw_task = self.to_taskwarrior(converted_tw_to_grocy_tasks[index])
            tw.task_add(tw_task)


    def sync(): 
        # Get all tasks from taskwarrior
        # Get all tasks from grocy
        # Push to taskwarrior
        taskwarrior_tasks = self.get_grocy_tw_tasks()

        try:
            grocy_tasks = self.findAll()
        except BaseException as e:
            logger.error(e)
            logger.error('Could not get all grocy tasks')

        try: 
            if self.resolution == 'tw':
                self.merge_from_tw(taskwarrior_tasks, grocy_tasks)
            else:
                self.merge_into_tw(taskwarrior_tasks, grocy_task)
        except BaseException as e:
            print(e)
            print('Could not sync')