# coding=utf-8
import logging
import os.path
from datetime import datetime
from typing import List, Optional

from tsgrain_controller import config, database, jobschedule, output, \
    task_queue, \
    models, grpc_server, systimecfg
from tsgrain_controller.io import io_factory


class Application(models.AppInterface):

    def __init__(self,
                 io_type: io_factory.IoType,
                 workdir: str = '',
                 cfg_path: Optional[str] = None):
        if cfg_path is None:
            cfg_path = os.path.join(workdir, 'tsgrain.toml')

        self.logger = logging.getLogger()
        self.logger.setLevel(logging.INFO)

        self.cfg = config.Config(cfg_path)
        self.cfg.load_file()

        if self.cfg.log_debug:
            self.logger.setLevel(logging.DEBUG)

        if self.cfg.db_path:
            db_path = self.cfg.db_path
        else:
            db_path = os.path.join(workdir, 'raindb.json')

        self.db = database.RainDB(db_path)

        self.queue = task_queue.TaskQueue(self)
        self.db.load_queue(self.queue)

        self.io = io_factory.new_io(self, io_type)
        self.io.set_callbacks(self._cb_manual, self._cb_modekey)

        self.outputs = output.Outputs(self.io, self.queue, self)

        self.scheduler = jobschedule.Scheduler(self)

        self.grpc_tsgrain_servicer = grpc_server.TSGRainServicer(self)
        self.grpc_server = grpc_server.new_server(self.grpc_tsgrain_servicer,
                                                  self.cfg.grpc_port)

        self._auto_en = self.db.get_auto_mode()
        self._running = False

    def get_auto_mode(self) -> bool:
        return self._auto_en

    def set_auto_mode(self, state: bool):
        if state != self._auto_en:
            self._auto_en = state
            self.grpc_tsgrain_servicer.tasklist_update.set()

        if self._auto_en:
            logging.info('Auto mode ON')
        else:
            logging.info('Auto mode OFF')

    def get_cfg(self) -> config.Config:
        return self.cfg

    def get_logger(self) -> logging.Logger:
        return self.logger

    def _cb_manual(self, zone_id: int):
        self.request_task(
            models.TaskRequest(source=models.Source.MANUAL,
                               zone_id=zone_id,
                               duration=self.cfg.manual_time,
                               queuing=False,
                               cancelling=True))

    def _cb_modekey(self):
        self.set_auto_mode(not self.get_auto_mode())

    def request_task(self,
                     request: models.TaskRequest) -> models.TaskRequestResult:
        if request.queuing:
            if request.cancelling:
                # If a task from this zone is in queue, cancel it
                for task in self.queue.tasks:
                    if task.zone_id == request.zone_id and task.source == request.source:
                        self.queue.cancel_task(task)
                        return models.TaskRequestResult(False, True)
        elif request.cancelling:
            current_task = self.queue.get_current_task()
            # Cancel manually started tasks
            if current_task is not None \
                and current_task.zone_id == request.zone_id \
                and current_task.source == request.source:
                self.queue.cancel_current_task()
                return models.TaskRequestResult(False, True)

        duration = request.duration
        if duration < 1:
            duration = self.cfg.manual_time

        task = models.Task(request.source, request.zone_id, duration)
        task.validate(self)
        started = self.queue.enqueue(task, not request.queuing)
        return models.TaskRequestResult(started, False)

    def start_task(self, source: models.Source, zone_id: int, duration: int,
                   queuing: bool) -> bool:
        if duration < 1:
            duration = self.cfg.manual_time

        task = models.Task(source, zone_id, duration)
        task.validate(self)
        return self.queue.enqueue(task, not queuing)

    def stop_task(self, source: models.Source, zone_id: int) -> bool:
        for task in self.queue.tasks:
            if task.zone_id == zone_id and task.source == source:
                self.queue.cancel_task(task)
                return True
        return False

    def get_tasks(self) -> List[models.Task]:
        return self.queue.tasks

    def create_job(self, job: models.Job) -> int:
        job.validate(self)
        return self.db.insert_job(job)

    def get_job(self, job_id: int) -> models.Job:
        return self.db.get_job(job_id)

    def get_jobs(self) -> List[models.Job]:
        return self.db.get_jobs()

    def update_job(self, job: models.Job):
        job.validate(self)
        self.db.update_job(job)

    def delete_job(self, job_id):
        self.db.delete_job(job_id)

    def enable_job(self, job_id: int):
        job = self.db.get_job(job_id)
        job.enable = True
        self.db.update_job(job)

    def disable_job(self, job_id: int):
        job = self.db.get_job(job_id)
        job.enable = False
        self.db.update_job(job)

    def notify_queue_update(self):
        self.grpc_tsgrain_servicer.tasklist_update.set()

    def is_running(self) -> bool:
        return self._running

    def get_system_timezone(self) -> str:
        return systimecfg.get_system_timezone(self.cfg.cmd_get_timezone)

    def set_system_datetime(self, date_time: datetime):
        systimecfg.set_system_datetime(date_time, self.cfg.cmd_set_datetime)

    def set_system_timezone(self, tz: str):
        systimecfg.set_system_timezone(tz, self.cfg.cmd_set_timezone)

    def start(self):
        self._running = True
        self.io.start()
        self.outputs.start()
        self.queue.start()
        self.scheduler.start()
        self.grpc_server.start()

    def stop(self):
        self._running = False
        self.grpc_server.stop(None)
        self.scheduler.stop()
        self.queue.stop()
        self.outputs.stop()
        self.io.stop()

        # Store application state
        self.db.store_queue(self.queue)
        self.db.set_auto_mode(self._auto_en)

        # Save config
        self.cfg.save_file()