"""
Tool_OCR - Translation Router (RESERVED)
Stub endpoints for future translation feature
"""

import logging
from typing import List

from fastapi import APIRouter, Depends, HTTPException, status
from sqlalchemy.orm import Session

from app.core.deps import get_db, get_current_active_user
from app.models.user import User
from app.schemas.translation import (
    TranslationRequest,
    TranslationResponse,
    TranslationFeatureStatus,
    LanguageInfo,
)
from app.services.translation_service import StubTranslationService


logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/v1/translate", tags=["Translation (RESERVED)"])


@router.get("/status", response_model=TranslationFeatureStatus, summary="Get translation feature status")
async def get_translation_status():
    """
    Get translation feature status

    Returns current implementation status and roadmap for translation feature.
    This is a RESERVED feature that will be implemented in Phase 5.

    **Status**: RESERVED - Not yet implemented
    **Phase**: Phase 5 (Post-production)
    **Priority**: Implemented after production deployment and user feedback
    """
    return StubTranslationService.get_feature_status()


@router.get("/languages", response_model=List[LanguageInfo], summary="Get supported languages")
async def get_supported_languages():
    """
    Get list of languages planned for translation support

    Returns list of languages that will be supported when translation
    feature is implemented.

    **Status**: RESERVED - Planning phase
    """
    return StubTranslationService.get_supported_languages()


@router.post("/document", response_model=TranslationResponse, summary="Translate document (RESERVED)")
async def translate_document(
    request: TranslationRequest,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Translate OCR document (RESERVED - NOT IMPLEMENTED)

    This endpoint is reserved for future translation functionality.
    Returns 501 Not Implemented status.

    **Expected Functionality** (when implemented):
    - Translate markdown documents while preserving structure
    - Support multiple translation engines (offline, ERNIE, Google, DeepL)
    - Maintain layout and formatting
    - Handle technical terminology

    **Planned Features**:
    - Offline translation (Argos Translate)
    - Cloud API integration (ERNIE, Google, DeepL)
    - Batch translation support
    - Translation memory
    - Glossary support

    **Current Status**: RESERVED for Phase 5 implementation

    ---

    **Request Parameters** (planned):
    - **file_id**: ID of OCR result file to translate
    - **source_lang**: Source language code (zh, en, ja, ko)
    - **target_lang**: Target language code (zh, en, ja, ko)
    - **engine_type**: Translation engine (offline, ernie, google, deepl)
    - **preserve_structure**: Whether to preserve markdown structure
    - **engine_config**: Engine-specific configuration

    **Response** (planned):
    - **task_id**: Translation task ID for tracking progress
    - **status**: Translation status
    - **translated_file_path**: Path to translated file (when completed)
    """
    logger.info(f"Translation request received from user {current_user.id} (stub endpoint)")

    # Return 501 Not Implemented with informative message
    raise HTTPException(
        status_code=status.HTTP_501_NOT_IMPLEMENTED,
        detail={
            "error": "Translation feature not implemented",
            "message": "This feature is reserved for future development (Phase 5)",
            "status": "RESERVED",
            "roadmap": {
                "phase": "Phase 5",
                "priority": "Implemented after production deployment",
                "planned_features": [
                    "Offline translation (Argos Translate)",
                    "Cloud API integration (ERNIE, Google, DeepL)",
                    "Structure-preserving markdown translation",
                    "Batch translation support"
                ]
            },
            "request_received": {
                "file_id": request.file_id,
                "source_lang": request.source_lang,
                "target_lang": request.target_lang,
                "engine_type": request.engine_type
            },
            "action": "Please check back in a future release or contact support for updates"
        }
    )


@router.get("/task/{task_id}", summary="Get translation task status (RESERVED)")
async def get_translation_task_status(
    task_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Get translation task status (RESERVED - NOT IMPLEMENTED)

    This endpoint would track translation task progress.
    Returns 501 Not Implemented status.

    **Planned Functionality**:
    - Real-time translation progress
    - Status updates (pending, processing, completed, failed)
    - Estimated completion time
    - Error reporting

    **Current Status**: RESERVED for Phase 5 implementation
    """
    logger.info(f"Translation status check for task {task_id} from user {current_user.id} (stub endpoint)")

    raise HTTPException(
        status_code=status.HTTP_501_NOT_IMPLEMENTED,
        detail={
            "error": "Translation feature not implemented",
            "message": "Translation task tracking is reserved for Phase 5",
            "task_id": task_id,
            "status": "RESERVED"
        }
    )


@router.delete("/task/{task_id}", summary="Cancel translation task (RESERVED)")
async def cancel_translation_task(
    task_id: int,
    db: Session = Depends(get_db),
    current_user: User = Depends(get_current_active_user)
):
    """
    Cancel ongoing translation task (RESERVED - NOT IMPLEMENTED)

    This endpoint would allow cancellation of translation tasks.
    Returns 501 Not Implemented status.

    **Planned Functionality**:
    - Cancel in-progress translations
    - Clean up temporary files
    - Refund credits (if applicable)

    **Current Status**: RESERVED for Phase 5 implementation
    """
    logger.info(f"Translation cancellation request for task {task_id} from user {current_user.id} (stub endpoint)")

    raise HTTPException(
        status_code=status.HTTP_501_NOT_IMPLEMENTED,
        detail={
            "error": "Translation feature not implemented",
            "message": "This feature is reserved for Phase 5",
            "status": "RESERVED"
        }
    )
