from django.db import models
from django.conf import settings
from apps.regions.models import Region


class Article(models.Model):
    """Model for articles."""

    ARTICLE_TYPE_CHOICES = [
        ('basic', '城市信息'),
        ('history', '历史'),
        ('culture', '文化'),
        ('practical', '实用'),
        ('life', '生活'),
    ]

    STATUS_CHOICES = [
        ('draft', '草稿'),
        ('pending_moderator', '待版主审核'),
        ('pending_ai', '待AI审核'),
        ('published', '已发布'),
        ('rejected', '已拒绝'),
    ]

    MODERATOR_STATUS_CHOICES = [
        ('pending', '待审核'),
        ('approved', '通过'),
        ('rejected', '拒绝'),
    ]

    AI_STATUS_CHOICES = [
        ('pending', '待审核'),
        ('approved', '通过'),
        ('rejected', '拒绝'),
    ]

    title = models.CharField(max_length=200, verbose_name='标题')
    content = models.TextField(verbose_name='内容')
    region = models.ForeignKey(
        Region,
        on_delete=models.CASCADE,
        related_name='articles',
        verbose_name='所属版块'
    )
    article_type = models.CharField(
        max_length=20,
        choices=ARTICLE_TYPE_CHOICES,
        verbose_name='内容类型'
    )
    author = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='articles',
        verbose_name='提交者'
    )

    # Moderator review
    moderator_reviewer = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.SET_NULL,
        null=True,
        blank=True,
        related_name='moderated_articles',
        verbose_name='版主审核人'
    )
    moderator_status = models.CharField(
        max_length=20,
        choices=MODERATOR_STATUS_CHOICES,
        default='pending',
        verbose_name='版主审核状态'
    )
    moderator_reviewed_at = models.DateTimeField(null=True, blank=True, verbose_name='版主审核时间')
    moderator_rejection_reason = models.TextField(null=True, blank=True, verbose_name='版主拒绝原因')

    # AI review
    ai_status = models.CharField(
        max_length=20,
        choices=AI_STATUS_CHOICES,
        default='pending',
        verbose_name='AI审核状态'
    )
    ai_reviewed_at = models.DateTimeField(null=True, blank=True, verbose_name='AI审核时间')
    ai_rejection_reason = models.TextField(null=True, blank=True, verbose_name='AI拒绝原因')

    # Publish status
    publish_status = models.CharField(
        max_length=20,
        choices=STATUS_CHOICES,
        default='draft',
        verbose_name='发布状态'
    )
    published_at = models.DateTimeField(null=True, blank=True, verbose_name='发布时间')

    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')
    updated_at = models.DateTimeField(auto_now=True, verbose_name='更新时间')

    class Meta:
        db_table = 'articles'
        verbose_name = '文章'
        verbose_name_plural = '文章'
        ordering = ['-created_at']

    def __str__(self):
        return self.title

    def submit_for_review(self):
        """Submit article for moderator review."""
        self.publish_status = 'pending_moderator'
        self.save()

    def approve_moderator(self, reviewer, reason=''):
        """Approve article by moderator."""
        self.moderator_status = 'approved'
        self.moderator_reviewer = reviewer
        self.moderator_reviewed_at = timezone.now()
        self.moderator_rejection_reason = reason
        self.publish_status = 'pending_ai'
        self.save()

    def reject_moderator(self, reviewer, reason):
        """Reject article by moderator."""
        self.moderator_status = 'rejected'
        self.moderator_reviewer = reviewer
        self.moderator_reviewed_at = timezone.now()
        self.moderator_rejection_reason = reason
        self.publish_status = 'rejected'
        self.save()

    def approve_ai(self, reason=''):
        """Approve article by AI."""
        self.ai_status = 'approved'
        self.ai_reviewed_at = timezone.now()
        self.ai_rejection_reason = reason
        self.publish_status = 'published'
        self.published_at = timezone.now()
        self.save()

    def reject_ai(self, reason):
        """Reject article by AI."""
        self.ai_status = 'rejected'
        self.ai_reviewed_at = timezone.now()
        self.ai_rejection_reason = reason
        self.publish_status = 'rejected'
        self.save()