import uuid

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


class BoardSession(models.Model):
    class Mode(models.TextChoices):
        COLLABORATE = "collaborate", "协作展示"
        DRAW_GUESS = "draw_guess", "数学你画我猜"

    class Status(models.TextChoices):
        WAITING = "waiting", "等待加入"
        ACTIVE = "active", "进行中"
        COMPLETED = "completed", "已完成"
        CANCELLED = "cancelled", "已取消"

    id = models.UUIDField(primary_key=True, default=uuid.uuid4, editable=False)
    code = models.CharField(max_length=6, unique=True)
    mode = models.CharField(
        max_length=16,
        choices=Mode.choices,
        default=Mode.COLLABORATE,
    )
    host = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name="hosted_board_sessions",
    )
    guest = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        null=True,
        blank=True,
        on_delete=models.CASCADE,
        related_name="joined_board_sessions",
    )
    target = models.CharField(max_length=40, blank=True)
    host_score = models.PositiveSmallIntegerField(default=0)
    guest_score = models.PositiveSmallIntegerField(default=0)
    status = models.CharField(
        max_length=16,
        choices=Status.choices,
        default=Status.WAITING,
    )
    expires_at = models.DateTimeField()
    created_at = models.DateTimeField(auto_now_add=True)
    completed_at = models.DateTimeField(null=True, blank=True)

    class Meta:
        ordering = ["-created_at"]

    def __str__(self):
        return f"{self.code} · {self.get_mode_display()}"