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

import random

import boto3

from datetime import datetime
from urllib.parse import urlparse

import os.path

s3client = boto3.client('s3', **getattr(settings, 'S3_CREDENTIALS', {}))

BUCKET = settings.AWS_BUCKET

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

def rough_date(d):
    days = (self.event_date - timezone.now().date()).days
    in_past = days < 0
    if in_past:
        days = abs(days)
    if days ==0:
        return "today!"
    if days >= 7:
        return in_past, "{0:d} weeks, {1:d} days".format(days / 7, days % 7)
    return in_past, f"{days} days"


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

class Ensemble(models.Model):
    name = models.CharField(max_length=100)
    code = models.CharField(max_length=9, default=generate_code)
    passphrase = models.CharField(max_length=100)
    admins = models.ManyToManyField('auth.User', related_name='ensembles')
    slug = models.SlugField(max_length=100, editable=False)
    details = models.TextField(blank=True)
    storage = models.ForeignKey('byostorage.UserStorage', null=True, on_delete=models.SET_NULL)

    def active_projects(self):
        return self.projects.filter(active=True)

    def ensemble_code(self):
        code = str(self.code)
        return "{}-{}-{}".format(code[:3], code[3:6], code[6:])

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

    def __str__(self):
        return self.name

class Project(models.Model):
    name = models.CharField(max_length=100)
    ensemble = models.ForeignKey(Ensemble, related_name='projects', on_delete=models.CASCADE, null=True)
    description = models.TextField(blank=True)
    active = models.BooleanField(default=True)
    event_date =models.DateField(null=True, blank=True)
    owner = models.CharField(max_length=255, blank=True)
    slug = models.SlugField(max_length=100, editable=False)
    enable_library = models.BooleanField(default=True, help_text="Enable items to be added from the library")
    enable_submissions = models.BooleanField(default=False, help_text="Allow media submissions from participants")

    @property
    def submissions(self):
        return self.all_submissions.filter(complete=True).order_by('-pk')

    def presigned_post(self, object_name, fields=None, conditions=None, expires=3600):
        key = os.path.join(self.slug, object_name)
        return s3client.generate_presigned_post(BUCKET, key, Fields=fields or {}, Conditions=conditions or [], ExpiresIn=expires)

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

    @property
    def has_happened(self):
        return self.event_date < timezone.now().date()

    def save(self):
        if not self.slug:
            self.slug = slugify(self.name)
        super(Project, self).save()

    def __str__(self):
        return self.name

class Resource(models.Model):
    project = models.ForeignKey(Project, related_name='resources', on_delete=models.CASCADE)
    name = models.CharField(max_length=100)
    description = models.TextField(blank=True)
    key = models.CharField(max_length=255, blank=True)
    media_type = models.CharField(max_length=10, choices=MEDIA_TYPES, default='*')
    visible = models.BooleanField(default=True)

    def key_template(self):
        return "{}/${{filename}}".format(slugify(self.name))

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

    def presigned_url(self):
        if not self.key:
            return ""
        params = {'Bucket': BUCKET, 'Key': self.key}
        return s3client.generate_presigned_url('get_object', Params=params, ExpiresIn=3600*24)

    def __str__(self):
        return self.name

class WikiPage(models.Model):
    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

class Submission(models.Model):
    project = models.ForeignKey(Project, related_name='all_submissions', on_delete=models.CASCADE)
    date = models.DateTimeField(auto_now_add=True, )
    name = models.CharField(max_length=255)
    instrument = models.CharField(max_length=100, verbose_name="Instrument / Voice")
    notes = models.TextField(blank=True)
    complete = models.BooleanField(default=False)
    url = models.CharField(max_length=512, blank=True)
    private = models.BooleanField(default=False)

    @property
    def download_url(self):
        if not self.complete:
            raise RuntimeError("Submission not complete")

        if self.private:
            return self.url

        params = {'Bucket': BUCKET, 'Key': self.url}
        return s3client.generate_presigned_url('get_object', Params=params, ExpiresIn=3600)

    @property
    def download_name(self):
        uri = urlparse(self.download_url)
        _, name = os.path.split(uri.path)
        return name or "<Unknown>"

    def key_template(self):
        return "submissions/{}_{}_{}_${{filename}}".format(
            timezone.localtime(self.date).isoformat(timespec='seconds').replace(':', '')[:17],
            slugify(self.name),
            slugify(self.instrument)
        ) 

    @property
    def short_name(self):
        _, ext = os.path.splitext(self.download_name)
        return "{}_{}_{}{}".format(
            #timezone.localtime(self.date).strftime("%Y%m%d%H%M%S"),
            slugify(self.name),
            slugify(self.instrument),
            self.pk,
            ext
        )

    def __str__(self):
        return f"{self.name}: {self.date}"