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


STATUS_CHOICES = [
    ('published', '已发布'),
    ('draft', '草稿'),
    ('reviewing', '审核中'),
    ('rejected', '已拒绝'),
]

EDITOR_MODE_CHOICES = [
    ('rich', '富文本'),
    ('markdown', 'Markdown'),
]

CATEGORY_CHOICES = [
    ('tech', '技术教程'),
    ('design', '设计前沿'),
    ('productivity', '效率方法'),
    ('industry', '行业洞察'),
    ('React', 'React'),
    ('Vue', 'Vue'),
    ('TypeScript', 'TypeScript'),
    ('Django', 'Django'),
    ('Python', 'Python'),
    ('CSS', 'CSS'),
    ('Go', 'Go'),
    ('DevOps', 'DevOps'),
    ('other', '其他'),
]


class Article(models.Model):
    title = models.CharField(max_length=200, verbose_name='标题')
    excerpt = models.TextField(blank=True, default='', verbose_name='摘要')
    content = models.TextField(verbose_name='内容')
    category = models.CharField(max_length=50, choices=CATEGORY_CHOICES, default='tech', verbose_name='分类')
    tags = models.JSONField(default=list, blank=True, verbose_name='标签')
    cover_image = models.ImageField(upload_to='articles/covers/%Y/%m/', blank=True, null=True, verbose_name='封面图')
    author = models.ForeignKey(
        settings.AUTH_USER_MODEL,
        on_delete=models.CASCADE,
        related_name='articles',
        verbose_name='作者'
    )
    status = models.CharField(max_length=20, choices=STATUS_CHOICES, default='published', verbose_name='状态')
    editor_mode = models.CharField(max_length=10, choices=EDITOR_MODE_CHOICES, default='rich', verbose_name='编辑模式')
    views = models.PositiveIntegerField(default=0, verbose_name='浏览量')
    likes = models.PositiveIntegerField(default=0, verbose_name='点赞数')
    is_top = models.BooleanField(default=False, verbose_name='是否置顶')
    is_featured = models.BooleanField(default=False, verbose_name='是否精选')
    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:
        verbose_name = '文章'
        verbose_name_plural = '文章'
        ordering = ['-is_top', '-created_at']

    def __str__(self):
        return self.title


class ArticleComment(models.Model):
    article = models.ForeignKey(Article, on_delete=models.CASCADE, related_name='comments', verbose_name='文章')
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='article_comments', verbose_name='用户')
    content = models.TextField(verbose_name='评论内容')
    parent = models.ForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='replies', verbose_name='父评论')
    likes = models.PositiveIntegerField(default=0, verbose_name='点赞数')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    class Meta:
        verbose_name = '文章评论'
        verbose_name_plural = '文章评论'
        ordering = ['-created_at']

    def __str__(self):
        return f'{self.user} - {self.content[:30]}'


class ArticleLike(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='article_likes', verbose_name='用户')
    article = models.ForeignKey(Article, on_delete=models.CASCADE, related_name='article_likes', verbose_name='文章')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    class Meta:
        verbose_name = '文章点赞'
        verbose_name_plural = '文章点赞'
        unique_together = ['user', 'article']

    def __str__(self):
        return f'{self.user} likes {self.article}'


class ArticleFavorite(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='article_favorites', verbose_name='用户')
    article = models.ForeignKey(Article, on_delete=models.CASCADE, related_name='article_favorites', verbose_name='文章')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    class Meta:
        verbose_name = '文章收藏'
        verbose_name_plural = '文章收藏'
        unique_together = ['user', 'article']

    def __str__(self):
        return f'{self.user} favorites {self.article}'


class ArticleCommentLike(models.Model):
    user = models.ForeignKey(settings.AUTH_USER_MODEL, on_delete=models.CASCADE, related_name='comment_likes', verbose_name='用户')
    comment = models.ForeignKey(ArticleComment, on_delete=models.CASCADE, related_name='comment_likes', verbose_name='评论')
    created_at = models.DateTimeField(auto_now_add=True, verbose_name='创建时间')

    class Meta:
        verbose_name = '评论点赞'
        verbose_name_plural = '评论点赞'
        unique_together = ['user', 'comment']

    def __str__(self):
        return f'{self.user} likes comment {self.comment_id}'