from datetime import datetime
from urllib.parse import urlparse

from fastapi import Query
from pydantic import (
    BaseModel,
    ConfigDict,
    Field,
    field_validator,
    model_validator,
)

from app.common.enums import QueueEnum


class ResourceItemSchema(BaseModel):
    """资源项目模型"""

    model_config = ConfigDict(from_attributes=True)

    name: str = Field(..., description="文件名")
    file_url: str = Field(..., description="文件URL路径")
    relative_path: str = Field(..., description="相对路径")
    is_file: bool = Field(..., description="是否为文件")
    is_dir: bool = Field(..., description="是否为目录")
    size: int | None = Field(None, description="文件大小(字节)")
    created_time: datetime | None = Field(None, description="创建时间")
    modified_time: datetime | None = Field(None, description="修改时间")
    is_hidden: bool = Field(False, description="是否为隐藏文件")

    @field_validator("file_url")
    @classmethod
    def _validate_file_url(cls, v: str) -> str:
        v = v.strip()
        parsed = urlparse(v)
        # 允许相对路径（以 / 开头）和完整的 http/https URL
        if parsed.scheme and parsed.scheme not in ("http", "https"):
            raise ValueError("文件URL必须为 http/https 或相对路径")
        return v

    @field_validator("relative_path")
    @classmethod
    def _validate_relative_path(cls, v: str) -> str:
        v = v.strip()
        if ".." in v or v.startswith("\\"):
            raise ValueError("相对路径包含不安全字符")
        return v

    @model_validator(mode="after")
    def _validate_flags(self):
        if self.is_file and self.is_dir:
            raise ValueError("不能同时为文件和目录")
        if not self.is_file and not self.is_dir:
            raise ValueError("必须是文件或目录之一")
        # 根据名称自动修正隐藏标记
        self.is_hidden = self.name.startswith(".")
        return self


class ResourceDirectorySchema(BaseModel):
    """资源目录模型"""

    model_config = ConfigDict(from_attributes=True)

    path: str = Field(..., description="目录路径")
    name: str = Field(..., description="目录名称")
    items: list[ResourceItemSchema] = Field(default_factory=list, description="目录项")
    total_files: int = Field(0, description="文件总数")
    total_dirs: int = Field(0, description="目录总数")
    total_size: int = Field(0, description="总大小")


class ResourceUploadSchema(BaseModel):
    """资源上传响应模型"""

    model_config = ConfigDict(from_attributes=True)

    filename: str = Field(..., description="文件名")
    file_url: str = Field(..., description="访问URL")
    file_size: int = Field(..., description="文件大小")
    upload_time: datetime = Field(..., description="上传时间")


class ResourceMoveSchema(BaseModel):
    """资源移动模型"""

    model_config = ConfigDict(from_attributes=True)

    source_path: str = Field(..., description="源路径")
    target_path: str = Field(..., description="目标路径")
    overwrite: bool = Field(False, description="是否覆盖")

    @field_validator("source_path", "target_path")
    @classmethod
    def validate_paths(cls, value: str):
        """
        校验移动/复制涉及的源路径与目标路径非空并去首尾空格。

        参数:
        - value (str): 路径字段当前值。

        返回:
        - str: 去空格后的路径。

        异常:
        - ValueError: 路径为空时抛出。
        """
        if not value or len(value.strip()) == 0:
            raise ValueError("路径不能为空")
        return value.strip()


class ResourceCopySchema(ResourceMoveSchema):
    """资源复制模型"""


class ResourceRenameSchema(BaseModel):
    """资源重命名模型"""

    model_config = ConfigDict(from_attributes=True)

    old_path: str = Field(..., description="原路径")
    new_name: str = Field(..., description="新名称")

    @field_validator("old_path", "new_name")
    @classmethod
    def validate_inputs(cls, value: str):
        """
        校验重命名所需的原路径与新名称非空并去首尾空格。

        参数:
        - value (str): 字段当前值。

        返回:
        - str: 去空格后的值。

        异常:
        - ValueError: 值为空时抛出。
        """
        if not value or len(value.strip()) == 0:
            raise ValueError("参数不能为空")
        return value.strip()

    @field_validator("new_name")
    @classmethod
    def _validate_new_name(cls, v: str) -> str:
        v = v.strip()
        if ".." in v or "/" in v or "\\" in v:
            raise ValueError("新名称包含不安全字符")
        return v


class ResourceCreateDirSchema(BaseModel):
    """创建目录模型"""

    model_config = ConfigDict(from_attributes=True)

    parent_path: str = Field(..., description="父目录路径")
    dir_name: str = Field(..., description="目录名称", max_length=255)

    @field_validator("parent_path", "dir_name")
    @classmethod
    def validate_inputs(cls, value: str, info):
        """
        校验创建目录的父路径与目录名，防止路径遍历等不安全输入。

        参数:
        - value (str): 当前字段值。
        - info: Pydantic 校验上下文（含 `field_name`）。

        返回:
        - str: 规范化后的字段值。

        异常:
        - ValueError: 含不安全字符或目录名为空时抛出。
        """
        # 对于parent_path允许为空字符串（表示根目录）或 '/'，其他情况必须非空
        if info.field_name == "parent_path":
            # 对于parent_path仍然严格检查路径遍历
            if ".." in value or value.startswith("\\"):
                raise ValueError("参数包含不安全字符")
        else:  # 对于dir_name仍然严格检查
            if not value or len(value.strip()) == 0:
                raise ValueError("参数不能为空")
            if ".." in value or value.startswith(("/", "\\")):
                raise ValueError("参数包含不安全字符")
        return value.strip()


class ResourceSearchQueryParam:
    """资源搜索查询参数"""

    def __init__(
        self,
        name: str | None = Query(None, description="搜索关键词"),
        path: str | None = Query(None, description="目录路径"),
    ) -> None:

        # 模糊查询字段
        self.name = (QueueEnum.like.value, name) if name else None

        # 精确查询字段
        self.path = path