from django.conf import settings
from django.db import models


class ContentItem(models.Model):
    class Ability(models.TextChoices):
        VISION = "vision", "数学眼光"
        HUMANITIES = "humanities", "数学人文"
        DETECTION = "detection", "数学侦探"
        MODELING = "modeling", "数学建模"
        CONNECTION = "connection", "数学联结"

    class Kind(models.TextChoices):
        VIDEO = "video", "视频"
        KNOWLEDGE = "knowledge", "知识卡片"
        PERSON = "person", "数学人物"

    slug = models.SlugField(unique=True)
    title = models.CharField(max_length=160)
    kind = models.CharField(max_length=16, choices=Kind.choices)
    summary = models.TextField(blank=True)
    body = models.TextField(blank=True)
    cover_url = models.URLField(blank=True)
    media_url = models.URLField(blank=True)
    topics = models.JSONField(default=list, blank=True)
    source = models.CharField(max_length=300, blank=True)
    ability_dimension = models.CharField(
        max_length=20, choices=Ability.choices, blank=True
    )
    module = models.CharField(max_length=40, blank=True)
    sub_category = models.CharField(max_length=80, blank=True)
    discipline = models.CharField(max_length=80, blank=True)
    discipline_icon = models.CharField(max_length=10, blank=True)
    author = models.CharField(max_length=120, blank=True)
    duration_seconds = models.PositiveIntegerField(default=0)
    view_count = models.PositiveIntegerField(default=0)
    comment_count = models.PositiveIntegerField(default=0)
    is_published = models.BooleanField(default=False)
    published_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        ordering = ["-published_at"]

    def __str__(self):
        return self.title


class ContentInteraction(models.Model):
    class Action(models.TextChoices):
        VIEW = "view", "浏览"
        FAVORITE = "favorite", "收藏"
        COMPLETE = "complete", "完成"

    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE)
    content = models.ForeignKey(ContentItem, on_delete=models.CASCADE, related_name="interactions")
    action = models.CharField(max_length=16, choices=Action.choices)
    created_at = models.DateTimeField(auto_now_add=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("user", "content", "action"), name="unique_content_interaction"
            )
        ]


class VideoProgress(models.Model):
    user = models.ForeignKey(
        settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name="video_progress"
    )
    content = models.ForeignKey(
        ContentItem, on_delete=models.CASCADE, related_name="video_progress"
    )
    position_seconds = models.PositiveIntegerField(default=0)
    completed = models.BooleanField(default=False)
    reward_granted = models.BooleanField(default=False)
    updated_at = models.DateTimeField(auto_now=True)
    completed_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        constraints = [
            models.UniqueConstraint(
                fields=("user", "content"), name="unique_user_video_progress"
            )
        ]