"""
项目预览相关 API（支持公开和私密项目）
"""
from fastapi import APIRouter, Depends, HTTPException, Header
from sqlalchemy.ext.asyncio import AsyncSession
from sqlalchemy import select
from typing import Optional

from app.core.database import get_db
from app.core.deps import get_current_user_optional
from app.models.project import Project, ProjectMember
from app.models.user import User
from app.schemas.response import success_response
from app.services.storage import storage_service

router = APIRouter()


async def check_preview_access(
    project: Project,
    current_user: Optional[User],
    db: AsyncSession
):
    """检查预览访问权限"""
    # 公开项目：任何人都可以访问
    if project.is_public == 1:
        return True

    # 私密项目：必须是项目成员
    if not current_user:
        raise HTTPException(status_code=401, detail="私密项目需要登录才能访问")

    # 检查是否是项目所有者
    if project.owner_id == current_user.id:
        return True

    # 检查是否是项目成员
    member_result = await db.execute(
        select(ProjectMember).where(
            ProjectMember.project_id == project.id,
            ProjectMember.user_id == current_user.id
        )
    )
    member = member_result.scalar_one_or_none()

    if not member:
        raise HTTPException(status_code=403, detail="无权访问该私密项目")

    return True


@router.get("/{project_id}/info", response_model=dict)
async def get_preview_info(
    project_id: int,
    current_user: Optional[User] = Depends(get_current_user_optional),
    db: AsyncSession = Depends(get_db)
):
    """获取预览项目基本信息"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查访问权限
    await check_preview_access(project, current_user, db)

    # 返回基本信息
    info = {
        "id": project.id,
        "name": project.name,
        "description": project.description,
        "is_public": project.is_public,
        "has_password": bool(project.access_pass),
    }

    return success_response(data=info)


@router.post("/{project_id}/verify", response_model=dict)
async def verify_access_password(
    project_id: int,
    password: str = Header(..., alias="X-Access-Password"),
    current_user: Optional[User] = Depends(get_current_user_optional),
    db: AsyncSession = Depends(get_db)
):
    """验证访问密码"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查访问权限
    await check_preview_access(project, current_user, db)

    # 验证密码
    if not project.access_pass:
        return success_response(message="该项目无需密码访问")

    if project.access_pass != password:
        raise HTTPException(status_code=403, detail="访问密码错误")

    return success_response(message="验证成功")


@router.get("/{project_id}/tree", response_model=dict)
async def get_preview_tree(
    project_id: int,
    password: Optional[str] = Header(None, alias="X-Access-Password"),
    current_user: Optional[User] = Depends(get_current_user_optional),
    db: AsyncSession = Depends(get_db)
):
    """获取预览项目的文档树"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查访问权限
    await check_preview_access(project, current_user, db)

    # 如果设置了密码，需要验证
    if project.access_pass:
        if not password or project.access_pass != password:
            raise HTTPException(status_code=403, detail="需要提供正确的访问密码")

    # 获取文档树
    project_path = storage_service.get_secure_path(project.storage_key)
    tree = storage_service.generate_tree(project_path)

    return success_response(data=tree)


@router.get("/{project_id}/file", response_model=dict)
async def get_preview_file(
    project_id: int,
    path: str,
    password: Optional[str] = Header(None, alias="X-Access-Password"),
    current_user: Optional[User] = Depends(get_current_user_optional),
    db: AsyncSession = Depends(get_db)
):
    """获取预览项目的文件内容"""
    # 查询项目
    result = await db.execute(select(Project).where(Project.id == project_id))
    project = result.scalar_one_or_none()

    if not project:
        raise HTTPException(status_code=404, detail="项目不存在")

    # 检查访问权限
    await check_preview_access(project, current_user, db)

    # 如果设置了密码，需要验证
    if project.access_pass:
        if not password or project.access_pass != password:
            raise HTTPException(status_code=403, detail="需要提供正确的访问密码")

    # 获取文件内容
    file_path = storage_service.get_secure_path(project.storage_key, path)
    content = await storage_service.read_file(file_path)

    return success_response(data={"content": content})