import json
import logging
from typing import List, Optional

from datetime import datetime, date

from fastapi import APIRouter, Body, Depends, HTTPException, Query
from pydantic import BaseModel
from sqlalchemy.ext.asyncio import AsyncSession

from core.database import get_db
from services.carts import CartsService
from dependencies.auth import get_current_user
from schemas.auth import UserResponse

# Set up logging
logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/v1/entities/carts", tags=["carts"])


# ---------- Pydantic Schemas ----------
class CartsData(BaseModel):
    """Entity data schema (for create/update)"""
    items_json: str = None


class CartsUpdateData(BaseModel):
    """Update entity data (partial updates allowed)"""
    items_json: Optional[str] = None


class CartsResponse(BaseModel):
    """Entity response schema"""
    id: int
    user_id: str
    items_json: Optional[str] = None
    created_at: Optional[datetime] = None
    updated_at: Optional[datetime] = None

    class Config:
        from_attributes = True


class CartsListResponse(BaseModel):
    """List response schema"""
    items: List[CartsResponse]
    total: int
    skip: int
    limit: int


class CartsBatchCreateRequest(BaseModel):
    """Batch create request"""
    items: List[CartsData]


class CartsBatchUpdateItem(BaseModel):
    """Batch update item"""
    id: int
    updates: CartsUpdateData


class CartsBatchUpdateRequest(BaseModel):
    """Batch update request"""
    items: List[CartsBatchUpdateItem]


class CartsBatchDeleteRequest(BaseModel):
    """Batch delete request"""
    ids: List[int]


# ---------- Routes ----------
@router.get("", response_model=CartsListResponse)
async def query_cartss(
    query: str = Query(None, description="Query conditions (JSON string)"),
    sort: str = Query(None, description="Sort field (prefix with '-' for descending)"),
    skip: int = Query(0, ge=0, description="Number of records to skip"),
    limit: int = Query(20, ge=1, le=2000, description="Max number of records to return"),
    fields: str = Query(None, description="Comma-separated list of fields to return"),
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Query cartss with filtering, sorting, and pagination (user can only see their own records)"""
    logger.debug(f"Querying cartss: query={query}, sort={sort}, skip={skip}, limit={limit}, fields={fields}")
    
    service = CartsService(db)
    try:
        # Parse query JSON if provided
        query_dict = None
        if query:
            try:
                query_dict = json.loads(query)
            except json.JSONDecodeError:
                raise HTTPException(status_code=400, detail="Invalid query JSON format")
        
        result = await service.get_list(
            skip=skip, 
            limit=limit,
            query_dict=query_dict,
            sort=sort,
            user_id=str(current_user.id),
        )
        logger.debug(f"Found {result['total']} cartss")
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error querying cartss: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@router.get("/all", response_model=CartsListResponse)
async def query_cartss_all(
    query: str = Query(None, description="Query conditions (JSON string)"),
    sort: str = Query(None, description="Sort field (prefix with '-' for descending)"),
    skip: int = Query(0, ge=0, description="Number of records to skip"),
    limit: int = Query(20, ge=1, le=2000, description="Max number of records to return"),
    fields: str = Query(None, description="Comma-separated list of fields to return"),
    db: AsyncSession = Depends(get_db),
):
    # Query cartss with filtering, sorting, and pagination without user limitation
    logger.debug(f"Querying cartss: query={query}, sort={sort}, skip={skip}, limit={limit}, fields={fields}")

    service = CartsService(db)
    try:
        # Parse query JSON if provided
        query_dict = None
        if query:
            try:
                query_dict = json.loads(query)
            except json.JSONDecodeError:
                raise HTTPException(status_code=400, detail="Invalid query JSON format")

        result = await service.get_list(
            skip=skip,
            limit=limit,
            query_dict=query_dict,
            sort=sort
        )
        logger.debug(f"Found {result['total']} cartss")
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error querying cartss: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@router.get("/{id}", response_model=CartsResponse)
async def get_carts(
    id: int,
    fields: str = Query(None, description="Comma-separated list of fields to return"),
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Get a single carts by ID (user can only see their own records)"""
    logger.debug(f"Fetching carts with id: {id}, fields={fields}")
    
    service = CartsService(db)
    try:
        result = await service.get_by_id(id, user_id=str(current_user.id))
        if not result:
            logger.warning(f"Carts with id {id} not found")
            raise HTTPException(status_code=404, detail="Carts not found")
        
        return result
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error fetching carts {id}: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@router.post("", response_model=CartsResponse, status_code=201)
async def create_carts(
    data: CartsData,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Create a new carts"""
    logger.debug(f"Creating new carts with data: {data}")
    
    service = CartsService(db)
    try:
        result = await service.create(data.model_dump(), user_id=str(current_user.id))
        if not result:
            raise HTTPException(status_code=400, detail="Failed to create carts")
        
        logger.info(f"Carts created successfully with id: {result.id}")
        return result
    except ValueError as e:
        logger.error(f"Validation error creating carts: {str(e)}")
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        logger.error(f"Error creating carts: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@router.post("/batch", response_model=List[CartsResponse], status_code=201)
async def create_cartss_batch(
    request: CartsBatchCreateRequest,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Create multiple cartss in a single request"""
    logger.debug(f"Batch creating {len(request.items)} cartss")
    
    service = CartsService(db)
    results = []
    
    try:
        for item_data in request.items:
            result = await service.create(item_data.model_dump(), user_id=str(current_user.id))
            if result:
                results.append(result)
        
        logger.info(f"Batch created {len(results)} cartss successfully")
        return results
    except Exception as e:
        await db.rollback()
        logger.error(f"Error in batch create: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Batch create failed: {str(e)}")


@router.put("/batch", response_model=List[CartsResponse])
async def update_cartss_batch(
    request: CartsBatchUpdateRequest,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Update multiple cartss in a single request (requires ownership)"""
    logger.debug(f"Batch updating {len(request.items)} cartss")
    
    service = CartsService(db)
    results = []
    
    try:
        for item in request.items:
            # Only include non-None values for partial updates
            update_dict = {k: v for k, v in item.updates.model_dump().items() if v is not None}
            result = await service.update(item.id, update_dict, user_id=str(current_user.id))
            if result:
                results.append(result)
        
        logger.info(f"Batch updated {len(results)} cartss successfully")
        return results
    except Exception as e:
        await db.rollback()
        logger.error(f"Error in batch update: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Batch update failed: {str(e)}")


@router.put("/{id}", response_model=CartsResponse)
async def update_carts(
    id: int,
    data: CartsUpdateData,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Update an existing carts (requires ownership)"""
    logger.debug(f"Updating carts {id} with data: {data}")

    service = CartsService(db)
    try:
        # Only include non-None values for partial updates
        update_dict = {k: v for k, v in data.model_dump().items() if v is not None}
        result = await service.update(id, update_dict, user_id=str(current_user.id))
        if not result:
            logger.warning(f"Carts with id {id} not found for update")
            raise HTTPException(status_code=404, detail="Carts not found")
        
        logger.info(f"Carts {id} updated successfully")
        return result
    except HTTPException:
        raise
    except ValueError as e:
        logger.error(f"Validation error updating carts {id}: {str(e)}")
        raise HTTPException(status_code=400, detail=str(e))
    except Exception as e:
        logger.error(f"Error updating carts {id}: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")


@router.delete("/batch")
async def delete_cartss_batch(
    request: CartsBatchDeleteRequest,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Delete multiple cartss by their IDs (requires ownership)"""
    logger.debug(f"Batch deleting {len(request.ids)} cartss")
    
    service = CartsService(db)
    deleted_count = 0
    
    try:
        for item_id in request.ids:
            success = await service.delete(item_id, user_id=str(current_user.id))
            if success:
                deleted_count += 1
        
        logger.info(f"Batch deleted {deleted_count} cartss successfully")
        return {"message": f"Successfully deleted {deleted_count} cartss", "deleted_count": deleted_count}
    except Exception as e:
        await db.rollback()
        logger.error(f"Error in batch delete: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Batch delete failed: {str(e)}")


@router.delete("/{id}")
async def delete_carts(
    id: int,
    current_user: UserResponse = Depends(get_current_user),
    db: AsyncSession = Depends(get_db),
):
    """Delete a single carts by ID (requires ownership)"""
    logger.debug(f"Deleting carts with id: {id}")
    
    service = CartsService(db)
    try:
        success = await service.delete(id, user_id=str(current_user.id))
        if not success:
            logger.warning(f"Carts with id {id} not found for deletion")
            raise HTTPException(status_code=404, detail="Carts not found")
        
        logger.info(f"Carts {id} deleted successfully")
        return {"message": "Carts deleted successfully", "id": id}
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Error deleting carts {id}: {str(e)}", exc_info=True)
        raise HTTPException(status_code=500, detail=f"Internal server error: {str(e)}")