from django.db import models
from django.db.models import Avg


class Genre(models.Model):
    name = models.CharField(max_length=100,verbose_name="类型")

    class Meta:
        db_table='Genre'
        verbose_name='电影类型'
        verbose_name_plural='电影类型'

    def __str__(self):
        return self.name


class Movie(models.Model):
    name=models.CharField(max_length=256,verbose_name="电影名")
    imdb_id = models.IntegerField(verbose_name="imdb_id")
    time=models.CharField(max_length=256,blank=True,verbose_name="时长")
    genre =models.ManyToManyField(Genre,verbose_name="类型")
    release_time=models.CharField(max_length=256,blank=True,verbose_name="发行时间")
    intro=models.TextField(blank=True,verbose_name="简介")
    director=models.CharField(max_length=256,blank=True,verbose_name="导演")
    actor=models.CharField(max_length=256,blank=True,verbose_name="演员")
    writers=models.CharField(max_length=256,blank=True,verbose_name="编剧")
    movie_similarity=models.ManyToManyField('self',through="Movie_similarity",symmetrical=False,verbose_name="相似电影")


    class Meta:
        db_table='Movie'
        verbose_name='电影信息'
        verbose_name_plural='电影信息'

    def __str__(self):
        return f"<Movie:{self.name},{self.imdb_id}>"


    def get_score(self):
        result_dct=self.movie_rating_set.aaggregate(Avg('score'))
        try:
            result=round(result_dct['score__avg'],1)
        except TypeError:
            return 0
        else:
            return result

    def get_user_score(self,user):
        return self.movie_rating_set.filter(user=user).values('score')

    def get_score_int_range(self):
        return range(int(self.get_score()))

    def get_genre(self):
        genre_dct=self.genre.all().values('name')
        genre_lst=[]
        for dct in genre_dct.values():
            genre_lst.append(dct['name'])
        return genre_lst


    def get_similarity(self,k=5):
        similarity_movies=self.movie_similarity.all()[:k]
        return similarity_movies

class Movie_similarity(models.Model):
    movie_source=models.ForeignKey(Movie,related_name='movie_source',on_delete=models.CASCADE)
    movie_target=models.ForeignKey(Movie,related_name='movie_target',on_delete=models.CASCADE)
    similarity=models.FloatField(verbose_name="相似度")

    class Meta:
        verbose_name='电影相似度'
        verbose_name_plural='电影相似度'


class User(models.Model):
    name=models.CharField(max_length=128,unique=True,verbose_name="用户名")
    password=models.CharField(max_length=256,verbose_name="密码")
    email=models.EmailField(unique=True,verbose_name="邮箱")
    rating_movies=models.ManyToManyField(Movie,through="Movie_rating")



    def __str__(self):
        return self.name

    class Meta:
        db_table='Usser'
        verbose_name='用户信息'
        verbose_name_plural='用户信息'

class Movie_rating(models.Model):
    user = models.ForeignKey(User, on_delete=models.CASCADE, unique=False, verbose_name="用户")
    movie=models.ForeignKey(Movie,on_delete=models.CASCADE,unique=False,verbose_name="电影")
    score=models.FloatField(verbose_name="评分")
    comment=models.TextField(blank=True,verbose_name="评论")

    class Meta:
        db_table='Movie_rating'
        verbose_name='电影评分信息'
        verbose_name_plural='电影评分信息'

class Movie_hot(models.Model):
    movie = models.ForeignKey(Movie, on_delete=models.CASCADE, verbose_name="电影名")
    rating_number = models.IntegerField(verbose_name="评分人数")



    class Meta:
        db_table='Movie_hot'
        verbose_name='最热电影'
        verbose_name_plural='最热电影'