from fastapi import APIRouter, Depends, HTTPException, status, Body, UploadFile, File
from sqlalchemy.orm import Session
from typing import List, Optional
import os
import uuid
from app.utils.file import file_storage

from app.models.database import get_db
from app.schemas.algorithm import AlgorithmCreate, AlgorithmUpdate, AlgorithmResponse, AlgorithmListResponse, AlgorithmVersionCreate, AlgorithmVersionUpdate, AlgorithmVersionResponse, AlgorithmCallCreate, AlgorithmCallResult
from app.models.models import AlgorithmCall
from app.services.algorithm import AlgorithmService, AlgorithmVersionService, AlgorithmCallService
from app.dependencies import get_current_active_user

# 创建路由器
router = APIRouter(prefix="/algorithms", tags=["algorithms"])


@router.post("", response_model=AlgorithmResponse)
async def create_algorithm(
    algorithm: AlgorithmCreate,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """创建算法"""
    # 只有管理员可以创建算法
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    # 创建算法
    db_algorithm = AlgorithmService.create_algorithm(db, algorithm)
    
    return db_algorithm


@router.get("", response_model=AlgorithmListResponse)
async def get_algorithms_no_slash(
    skip: int = 0,
    limit: int = 100,
    type: Optional[str] = None,
    db: Session = Depends(get_db)
):
    """获取算法列表（不带末尾斜杠）"""
    algorithms = AlgorithmService.get_algorithms(db, skip=skip, limit=limit, algorithm_type=type)
    return {"algorithms": algorithms, "total": len(algorithms)}


@router.get("/", response_model=AlgorithmListResponse)
async def get_algorithms(
    skip: int = 0,
    limit: int = 100,
    type: Optional[str] = None,
    db: Session = Depends(get_db)
):
    """获取算法列表"""
    algorithms = AlgorithmService.get_algorithms(db, skip=skip, limit=limit, algorithm_type=type)
    return {"algorithms": algorithms, "total": len(algorithms)}


@router.get("/{algorithm_id}", response_model=AlgorithmResponse)
async def get_algorithm(
    algorithm_id: str,
    db: Session = Depends(get_db)
):
    """获取算法详情"""
    algorithm = AlgorithmService.get_algorithm_by_id(db, algorithm_id)
    if not algorithm:
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    return algorithm


@router.put("/{algorithm_id}", response_model=AlgorithmResponse)
async def update_algorithm(
    algorithm_id: str,
    algorithm_update: AlgorithmUpdate,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """更新算法"""
    # 只有管理员可以更新算法
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    algorithm = AlgorithmService.update_algorithm(db, algorithm_id, algorithm_update)
    if not algorithm:
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    return algorithm


@router.delete("/{algorithm_id}", response_model=dict)
async def delete_algorithm(
    algorithm_id: str,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """删除算法"""
    # 只有管理员可以删除算法
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    success = AlgorithmService.delete_algorithm(db, algorithm_id)
    if not success:
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    return {"message": "Algorithm deleted successfully"}


# 算法版本相关路由
@router.post("/{algorithm_id}/versions", response_model=AlgorithmVersionResponse)
async def create_version(
    algorithm_id: str,
    version: AlgorithmVersionCreate,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """创建算法版本"""
    # 只有管理员可以创建算法版本
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    # 验证算法是否存在
    if not AlgorithmService.get_algorithm_by_id(db, algorithm_id):
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    # 确保版本的算法ID与路径一致
    version.algorithm_id = algorithm_id
    
    # 创建版本
    db_version = AlgorithmVersionService.create_version(db, version)
    
    return db_version


@router.get("/{algorithm_id}/versions", response_model=List[AlgorithmVersionResponse])
async def get_versions(
    algorithm_id: str,
    db: Session = Depends(get_db)
):
    """获取算法版本列表"""
    # 验证算法是否存在
    if not AlgorithmService.get_algorithm_by_id(db, algorithm_id):
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    # 获取版本列表
    versions = AlgorithmVersionService.get_versions_by_algorithm_id(db, algorithm_id)
    
    return versions


@router.get("/{algorithm_id}/versions/{version_id}", response_model=AlgorithmVersionResponse)
async def get_version(
    algorithm_id: str,
    version_id: str,
    db: Session = Depends(get_db)
):
    """获取算法版本详情"""
    # 验证算法是否存在
    if not AlgorithmService.get_algorithm_by_id(db, algorithm_id):
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    # 获取版本
    version = AlgorithmVersionService.get_version_by_id(db, version_id)
    if not version:
        raise HTTPException(status_code=404, detail="Version not found")
    
    # 验证版本是否属于该算法
    if version.algorithm_id != algorithm_id:
        raise HTTPException(status_code=400, detail="Version does not belong to this algorithm")
    
    return version


@router.put("/{algorithm_id}/versions/{version_id}", response_model=AlgorithmVersionResponse)
async def update_version(
    algorithm_id: str,
    version_id: str,
    version_update: AlgorithmVersionUpdate,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """更新算法版本"""
    # 只有管理员可以更新算法版本
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    # 验证算法是否存在
    if not AlgorithmService.get_algorithm_by_id(db, algorithm_id):
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    # 获取版本
    version = AlgorithmVersionService.get_version_by_id(db, version_id)
    if not version:
        raise HTTPException(status_code=404, detail="Version not found")
    
    # 验证版本是否属于该算法
    if version.algorithm_id != algorithm_id:
        raise HTTPException(status_code=400, detail="Version does not belong to this algorithm")
    
    # 更新版本
    updated_version = AlgorithmVersionService.update_version(db, version_id, version_update)
    
    return updated_version


@router.delete("/{algorithm_id}/versions/{version_id}", response_model=dict)
async def delete_version(
    algorithm_id: str,
    version_id: str,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """删除算法版本"""
    # 只有管理员可以删除算法版本
    if current_user.role != "admin":
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    # 验证算法是否存在
    if not AlgorithmService.get_algorithm_by_id(db, algorithm_id):
        raise HTTPException(status_code=404, detail="Algorithm not found")
    
    # 获取版本
    version = AlgorithmVersionService.get_version_by_id(db, version_id)
    if not version:
        raise HTTPException(status_code=404, detail="Version not found")
    
    # 验证版本是否属于该算法
    if version.algorithm_id != algorithm_id:
        raise HTTPException(status_code=400, detail="Version does not belong to this algorithm")
    
    # 删除版本
    success = AlgorithmVersionService.delete_version(db, version_id)
    if not success:
        raise HTTPException(status_code=400, detail="Failed to delete version")
    
    return {"message": "Version deleted successfully"}


# 算法调用相关路由
@router.post("/call/public", response_model=AlgorithmCallResult)
async def call_algorithm_public(
    call: AlgorithmCallCreate,
    db: Session = Depends(get_db)
):
    """公开调用算法（不需要认证，用于演示页面）"""
    # 使用匿名用户ID进行调用
    anonymous_user_id = "anonymous"
    
    # 执行算法
    result = AlgorithmCallService.execute_algorithm(db, anonymous_user_id, call)
    
    return result


@router.post("/call", response_model=AlgorithmCallResult)
async def call_algorithm(
    call: AlgorithmCallCreate,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """调用算法"""
    # 执行算法
    result = AlgorithmCallService.execute_algorithm(db, current_user.id, call)
    
    return result


@router.get("/calls/{call_id}", response_model=AlgorithmCallResult)
async def get_call_result(
    call_id: str,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """获取算法调用结果"""
    # 获取调用记录
    call = AlgorithmCallService.get_call_by_id(db, call_id)
    if not call:
        raise HTTPException(status_code=404, detail="Call not found")
    
    # 管理员可以查看所有调用记录，普通用户只能查看自己的
    if current_user.role != "admin" and current_user.id != call.user_id:
        raise HTTPException(status_code=403, detail="Not enough permissions")
    
    return call


@router.get("/calls", response_model=List[AlgorithmCallResult])
async def get_call_history(
    skip: int = 0,
    limit: int = 100,
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """获取调用历史"""
    # 管理员可以查看所有调用记录，普通用户只能查看自己的
    if current_user.role == "admin":
        # 这里可以添加分页和过滤，暂时返回所有
        calls = db.query(AlgorithmCall).offset(skip).limit(limit).all()
    else:
        calls = AlgorithmCallService.get_calls_by_user_id(db, current_user.id, skip=skip, limit=limit)
    
    return calls


# 代码执行相关路由
@router.post("/execute-code")
async def execute_code(
    code: str = Body(..., description="Python代码"),
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """执行Python代码"""
    # 执行代码
    result = AlgorithmCallService.execute_python_code(code)
    
    return result


# 模型文件上传路由
@router.post("/upload-model")
async def upload_model(
    file: UploadFile = File(..., description="模型文件"),
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """上传模型文件"""
    # 支持的文件类型
    allowed_extensions = {
        ".pt", ".pth", ".h5", ".hdf5", ".onnx", ".pb", ".tflite", 
        ".joblib", ".pkl", ".zip", ".tar.gz"
    }
    
    # 验证文件类型
    file_extension = os.path.splitext(file.filename)[1].lower()
    if file_extension not in allowed_extensions:
        return {
            "success": False,
            "message": f"不支持的文件类型，支持的类型：{', '.join(allowed_extensions)}"
        }
    
    try:
        # 生成唯一的文件名
        unique_filename = f"models/{uuid.uuid4().hex[:8]}{file_extension}"
        
        # 读取文件内容
        file_content = await file.read()
        
        # 上传文件到MinIO
        import io
        file_obj = io.BytesIO(file_content)
        success = file_storage.upload_fileobj(file_obj, unique_filename, file.content_type)
        
        if success:
            return {
                "success": True,
                "file_path": unique_filename,
                "message": "模型文件上传成功"
            }
        else:
            return {
                "success": False,
                "message": "模型文件上传失败"
            }
    except Exception as e:
        return {
            "success": False,
            "message": f"模型文件上传失败：{str(e)}"
        }


# 视频文件上传路由
@router.post("/upload-video")
async def upload_video(
    file: UploadFile = File(..., description="视频文件"),
    current_user: dict = Depends(get_current_active_user),
    db: Session = Depends(get_db)
):
    """上传视频文件"""
    # 支持的视频文件类型
    allowed_extensions = {
        ".mp4", ".avi", ".mov", ".wmv", ".flv", ".mkv", ".webm"
    }
    
    # 验证文件类型
    file_extension = os.path.splitext(file.filename)[1].lower()
    if file_extension not in allowed_extensions:
        return {
            "success": False,
            "message": f"不支持的视频文件类型，支持的类型：{', '.join(allowed_extensions)}"
        }
    
    try:
        # 生成唯一的文件名
        unique_filename = f"videos/{current_user['id']}/{uuid.uuid4().hex[:12]}{file_extension}"
        
        # 读取文件内容
        file_content = await file.read()
        
        # 上传文件到MinIO
        import io
        file_obj = io.BytesIO(file_content)
        success = file_storage.upload_fileobj(file_obj, unique_filename, file.content_type)
        
        if success:
            return {
                "success": True,
                "file_path": unique_filename,
                "message": "视频文件上传成功"
            }
        else:
            return {
                "success": False,
                "message": "视频文件上传失败"
            }
    except Exception as e:
        return {
            "success": False,
            "message": f"视频文件上传失败：{str(e)}"
        }