from django.db import models
from django.utils.translation import ugettext_lazy as _
import django.contrib.postgres.fields as postgres
from users.models import User
from common.utils import GenerateDateUUIDMediaFilePath
from django.conf import settings


def sync_file_path(instance, filename):
    return GenerateDateUUIDMediaFilePath(instance, filename, settings.SYNC_FILE_PATH_ROOT)


class SyncTask(models.Model):
    """A class that records information about douban data synchronization task."""

    #-----------------------------------#
    # basic infos
    #-----------------------------------#
    user = models.ForeignKey(
        User, on_delete=models.CASCADE, related_name='user_%(class)ss')
    file = models.FileField(upload_to=sync_file_path, default='')

    #-----------------------------------#
    # options
    #-----------------------------------#
    # for the same book, if is already marked before sync, overwrite the previous mark or not
    overwrite = models.BooleanField(default=False)
    # sync book marks or not
    sync_book = models.BooleanField()
    # sync movie marks or not
    sync_movie = models.BooleanField()
    # sync music marks or not
    sync_music = models.BooleanField()    
    # sync game marks or not
    sync_game = models.BooleanField()
    # default visibility of marks
    default_public = models.BooleanField()

    #-----------------------------------#
    # execution status
    #-----------------------------------#
    is_failed = models.BooleanField(default=False)
    # fail_reason = models.TextField(default='')
    is_finished = models.BooleanField(default=False)
    # how many items to synchronize
    total_items = models.PositiveIntegerField(default=0)
    # how many items are handled
    finished_items = models.PositiveIntegerField(default=0)
    # how many imtes have been synchronized successfully
    success_items = models.PositiveIntegerField(default=0)

    failed_urls = postgres.ArrayField(
        models.URLField(blank=True, default='', max_length=200),
        null=True,
        blank=True,
        default=list,
    )

    break_point = models.CharField(max_length=100, default="", blank=True)

    started_time = models.DateTimeField(auto_now_add=True)
    ended_time = models.DateTimeField(auto_now=True)

    class Meta:
        """Meta definition for SyncTask."""

        verbose_name = 'SyncTask'
        verbose_name_plural = 'SyncTasks'

    def __str__(self):
        """Unicode representation of SyncTask."""
        return f'{self.id} {self.user} {self.file} {self.get_status_emoji()} {self.success_items}/{self.finished_items}/{self.total_items}'

    def get_status_emoji(self):
        return ("❌" if self.is_failed else "✔") if self.is_finished else "⚡"

    def get_duration(self):
        return self.ended_time - self.started_time
    
    def get_overwritten_items(self):
        if self.overwrite:
            return self.overwrite_books + self.overwrite_games + self.overwrite_movies + self.overwrite_music
        else:
            return 0

    def get_progress(self):
        """
        @return: return percentage
        """
        if self.is_finished:
            return 100
        else:
            if self.total_items > 0:
                return 100 * self.finished_items / self.total_items
            else:
                return 0

    def get_breakpoint(self):
        if not self.break_point:
            return None, None
        progress = self.break_point.split('-')
        return progress[0], int(progress[1])

    def set_breakpoint(self, sheet_name, row_index, save=False):
        self.break_point = f"{sheet_name}-{row_index}"
        if save:
            self.save(update_fields=['break_point'])

    def clear_breakpoint(self, save=False):
        self.break_point = ""
        if save:
            self.save(update_fields=['break_point'])