from django.db import models
from django.utils.text import slugify
from django.utils import timezone
from django.conf import settings
from django.shortcuts import resolve_url

from byostorage.user import BYOStorage

import random

from urllib.parse import urlparse

import os.path
from .utils import sign_data

MEDIA_TYPES = [
    ('audio', "Audio"),
    ('video', "Video"),
    ('general', "General"),
]

def rough_date(d):
    if not d:
        return False, "sometime..."
    days = (d - timezone.now()).days
    in_past = days < 0
    if in_past:
        days = abs(days)
    if days == 0:
        m = int((d-timezone.now()).seconds/60)
        if m > 60:
            return in_past, "{0:d} hours".format(int(m / 60))
        return in_past, "{0:d} minutes!".format(int(m % 60))
    if days >= 14:
        return in_past, "{0:d} weeks".format(int(days/7))
    if days >= 7:
        return in_past, "{0:d} weeks, {1:d} days".format(int(days / 7), int(days % 7))
    return in_past, f"{days} days"


def generate_code(length=9):
    return "".join([ random.choice('0123456789') for _ in range(length) ])

class EnsembleQuerySet(models.QuerySet):
    
    def for_user(self, user, ensemble_keys=[], project_keys=[]):
        if user.is_superuser:
            return self 

        f = models.Q(slug__in=ensemble_keys) | models.Q(projects__in=project_keys)
        
        if user.is_authenticated:
            f |= models.Q(admins=user.pk)

        return self.filter(f).distinct()

class Ensemble(models.Model):
    ''' A group that plays together
    
    '''
    name = models.CharField(max_length=100,
            help_text="Display name")
    slug = models.SlugField(max_length=100, editable=False, unique=True,
            help_text="Short name for the ensemble - used for folders")
    admins = models.ManyToManyField('auth.User', related_name='ensembles')
    details = models.TextField(blank=True, 
            help_text="Description of the ensemble (markdown)")
    storage = models.ForeignKey('byostorage.UserStorage', null=True, on_delete=models.SET_NULL,
            help_text="Default storage for this ensemble")
    nonce = models.SmallIntegerField(default=1,
            help_text="Increment this to reset the authentication links")

    objects = EnsembleQuerySet.as_manager()

    class Meta:
        ordering = ('slug', )

    def active_projects(self):
        return self.projects.active().current()

    def has_admin(self, user):
        if not user.is_authenticated:
            return False
        if user.is_superuser:
            return True
        return user.pk in self.admins.values_list('pk', flat=True)

    def save(self, **kwargs):
        if not self.slug:
            self.slug = slugify(self.name)
        super(Ensemble, self).save(**kwargs)

    def get_absolute_url(self):
        return resolve_url('ensemble_detail', ensemble=self.slug)

    def auth(self):
        return sign_data(f'{self.pk}-{self.nonce}', 12)

    def __str__(self):
        return self.name

class ProjectQuerySet(models.QuerySet):
    def current(self):
        return self.filter(models.Q(event_date__gte=(timezone.now()-timezone.timedelta(7))) | models.Q(event_date=None))
    
    def active(self):
        return self.filter(active=True)

    def for_user(self, user, project_keys=[], ensemble_keys=[]):
        if user.is_superuser:
            return self 

        f = models.Q(pk__in=project_keys) | models.Q(ensemble__slug__in=ensemble_keys)
        
        if user.is_authenticated:
            f |= models.Q(ensemble__admins=user.pk)

        return self.filter(f)

class Project(models.Model):
    ''' A Project linked to an ensemble
    '''
    name = models.CharField(max_length=100)
    ensemble = models.ForeignKey(Ensemble, related_name='projects', on_delete=models.CASCADE, null=True)
    description = models.TextField(blank=True, 
            help_text="Markdown format")
    active = models.BooleanField(default=True)
    event_date =models.DateTimeField(null=True, blank=True)
    owner = models.CharField(max_length=255, blank=True)
    nonce = models.SmallIntegerField(default=1,
            help_text="Increment this to reset the authentication links")

    objects = ProjectQuerySet.as_manager()

    class Meta:
        ordering = ['active', 'event_date']

    @property
    def days(self):
        return (self.event_date - timezone.now().date()).days

    @property
    def has_happened(self):
        if not self.event_date:
            return False
        return self.event_date < timezone.now()

    @property
    def rough_date(self):
        if not self.event_date:
            return "No timescale"
        in_past, s = rough_date(self.event_date)
        if in_past:
            return f"{s} ago"
        return f"In {s}"

    @property
    def folder(self):
        project = slugify(self.name)
        print(f"{self.ensemble.storage_id}:{self.ensemble.slug}/{project}")
        return f"{self.ensemble.storage_id}:{self.ensemble.slug}/{project}"

    @property
    def active_modules(self):
        return self.modules.values_list('name', flat=True)

    def get_absolute_url(self):
        return resolve_url('project_detail', project=self.pk)
    
    def auth(self):
        return sign_data(f'{self.pk}-{self.nonce}', 12)

    def __str__(self):
        return self.name

class Module(models.Model):
    ''' Enable modules on a oriject
    '''
    name = models.SlugField(max_length=20, choices=[ (x, x.title()) for x in settings.POLYPHONIC_MODULES ])
    project = models.ForeignKey(Project, related_name="modules", on_delete=models.CASCADE)

    def __str__(self):
        return self.name

def resource_key(resource, filename):
    return f'{resource.project.folder}/resources/{filename}'

class Resource(models.Model):
    ''' A viewable file resource attached to a project

    e.g PDF instructions, MP3 backing track
    '''
    project = models.ForeignKey(Project, related_name='resources', on_delete=models.CASCADE)
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)
    file = models.FileField(storage=BYOStorage(), upload_to=resource_key)
    media_type = models.CharField(max_length=10, choices=MEDIA_TYPES, default='*')
    visible = models.BooleanField(default=True)

    class Meta:
        ordering = ['-visible', '-pk']

    def accept(self):
        if self.media_type == 'general':
            return ".*"
        return f"{self.media_type}/*"

    def __str__(self):
        return self.name

class WikiPage(models.Model):
    ''' An editable wiki page for the project in markdown format
    
    '''
    project = models.ForeignKey(Project, related_name='wiki_pages', on_delete=models.CASCADE)
    title = models.CharField(max_length=255)
    markdown = models.TextField()

    def get_absolute_url(self):
        return resolve_url('wiki', project=self.project_id, pk=self.pk)

    def __str__(self):
        return self.title