"""
Metadata API Endpoints
Handles metadata updates and verification.
"""

from fastapi import APIRouter, Depends, HTTPException, Request, status
from sqlalchemy.ext.asyncio import AsyncSession

from app.core.auth import get_current_user_id
from app.core.database import get_db, AuditLogRepository
from app.core.redis_client import RedisSessionStore
from app.services.metadata_service import get_metadata_service, MetadataService
from app.models.file import (
    FileMetadataUpdate,
    BatchMetadataUpdate,
    MetadataUpdateResponse
)


router = APIRouter()


@router.put("/{file_id}")
async def update_file_metadata(
    file_id: str,
    update_data: FileMetadataUpdate,
    request: Request,
    user_id: int = Depends(get_current_user_id),
    db: AsyncSession = Depends(get_db),
    metadata_service: MetadataService = Depends(get_metadata_service)
):
    """
    Update metadata for a single file.
    """
    # Get file session
    redis: RedisSessionStore = request.app.state.redis
    session_data = await redis.get_file_session(update_data.session_id)

    if not session_data or session_data.get("user_id") != user_id:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Session not found or access denied"
        )

    # Get file from session
    files = session_data.get("files", [])
    if update_data.file_index >= len(files):
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="Invalid file index"
        )

    file_info = files[update_data.file_index]

    if file_info.get("file_id") != file_id:
        raise HTTPException(
            status_code=status.HTTP_400_BAD_REQUEST,
            detail="File ID mismatch"
        )

    # Update metadata
    success, message = await metadata_service.update_file_metadata(
        filepath=file_info["filepath"],
        metadata=update_data.metadata.dict(exclude_none=True)
    )

    if not success:
        raise HTTPException(
            status_code=status.HTTP_500_INTERNAL_SERVER_ERROR,
            detail=message
        )

    # Update session with new metadata
    file_info["suggested_metadata"] = update_data.metadata.dict(exclude_none=True)
    files[update_data.file_index] = file_info
    await redis.update_file_session(update_data.session_id, files)

    # Log action
    await AuditLogRepository.log_action(
        db,
        user_id=user_id,
        action="metadata_update",
        details=f"Updated metadata for file: {file_info['filename']}"
    )

    return MetadataUpdateResponse(
        success=True,
        file_id=file_id,
        filename=file_info["filename"],
        verified="verified" in message.lower(),
        message=message
    )


@router.post("/batch-update")
async def batch_update_metadata(
    update_data: BatchMetadataUpdate,
    request: Request,
    user_id: int = Depends(get_current_user_id),
    db: AsyncSession = Depends(get_db),
    metadata_service: MetadataService = Depends(get_metadata_service)
):
    """
    Update metadata for multiple files with same metadata.
    """
    # Get file session
    redis: RedisSessionStore = request.app.state.redis
    session_data = await redis.get_file_session(update_data.session_id)

    if not session_data or session_data.get("user_id") != user_id:
        raise HTTPException(
            status_code=status.HTTP_404_NOT_FOUND,
            detail="Session not found or access denied"
        )

    # Get files from session
    files = session_data.get("files", [])

    # Update each file
    results = []
    metadata_dict = update_data.metadata.dict(exclude_none=True)

    for file_index in update_data.file_indices:
        if file_index >= len(files):
            continue

        file_info = files[file_index]

        try:
            # Update metadata
            success, message = await metadata_service.update_file_metadata(
                filepath=file_info["filepath"],
                metadata=metadata_dict
            )

            results.append({
                "file_id": file_info["file_id"],
                "filename": file_info["filename"],
                "success": success,
                "message": message
            })

            # Update session
            if success:
                file_info["suggested_metadata"] = metadata_dict
                files[file_index] = file_info

        except Exception as e:
            results.append({
                "file_id": file_info.get("file_id"),
                "filename": file_info.get("filename"),
                "success": False,
                "message": str(e)
            })

    # Update session with new metadata
    await redis.update_file_session(update_data.session_id, files)

    # Log action
    await AuditLogRepository.log_action(
        db,
        user_id=user_id,
        action="batch_metadata_update",
        details=f"Updated metadata for {len(update_data.file_indices)} files"
    )

    return {
        "success": True,
        "results": results,
        "message": f"Updated {len(results)} files"
    }