"""
API v1 通用模型
"""
import os
import uuid
from django.db import models
from django.contrib.auth import get_user_model
from flower.common import ModelBase

User = get_user_model()


def upload_file_path(instance, filename):
    """
    生成随机化的文件上传路径
    
    格式: uploads/YYYY/MM/DD/uuid.ext
    """
    # 获取文件扩展名
    ext = os.path.splitext(filename)[1].lower()
    # 生成随机文件名
    random_filename = f"{uuid.uuid4().hex}{ext}"
    # 返回完整路径
    from datetime import datetime
    now = datetime.now()
    return f"uploads/{now.year}/{now.month:02d}/{now.day:02d}/{random_filename}"


class UploadedFile(ModelBase):
    """
    通用文件上传记录
    
    用于存储无法归类到具体业务的文件上传记录
    """
    path = models.FileField(
        upload_to=upload_file_path,
        max_length=500,
        verbose_name='文件路径',
        help_text='文件存储路径，包含前缀、随机文件名和后缀'
    )
    owner = models.ForeignKey(
        User,
        on_delete=models.CASCADE,
        related_name='uploaded_files',
        verbose_name='上传者'
    )
    is_deleted = models.BooleanField(
        default=False,
        verbose_name='是否已删除',
        help_text='软删除标记'
    )
    original_filename = models.CharField(
        max_length=255,
        blank=True,
        verbose_name='原始文件名',
        help_text='用户上传时的原始文件名'
    )
    file_size = models.BigIntegerField(
        null=True,
        blank=True,
        verbose_name='文件大小(字节)'
    )
    content_type = models.CharField(
        max_length=100,
        blank=True,
        verbose_name='文件类型',
        help_text='MIME类型，如 image/jpeg'
    )
    
    class Meta:
        db_table = 'api_uploaded_file'
        verbose_name = '上传文件'
        verbose_name_plural = '上传文件'
        ordering = ['-created_at']
    
    def __str__(self):
        return f"{self.original_filename or self.path.name} (by {self.owner.username})"
    
    @property
    def file_url(self):
        """获取文件访问URL"""
        if self.path:
            return self.path.url
        return None