"""API endpoints for file system-based summary management."""

from fastapi import APIRouter, HTTPException, Path, Query
from pydantic import BaseModel, Field
from typing import List, Dict, Any, Optional
import logging

from ..services.summary_storage import storage_service

logger = logging.getLogger(__name__)

router = APIRouter(prefix="/api/summaries", tags=["file-summaries"])


class SummaryResponse(BaseModel):
    """Response model for a single summary."""
    video_id: str
    generated_at: str
    model: str
    summary: str
    key_points: List[str]
    main_themes: List[str]
    actionable_insights: List[str]
    confidence_score: float
    processing_metadata: Dict[str, Any]
    cost_data: Dict[str, Any]
    transcript_length: int
    file_path: str
    file_size_bytes: int
    file_created_at: str
    file_modified_at: str


class SummaryListResponse(BaseModel):
    """Response model for multiple summaries."""
    video_id: str
    summaries: List[SummaryResponse]
    total_summaries: int


class SummaryStatsResponse(BaseModel):
    """Response model for summary statistics."""
    total_videos_with_summaries: int
    total_summaries: int
    total_size_bytes: int
    total_size_mb: float
    model_distribution: Dict[str, int]
    video_ids: List[str]


@router.get("/video/{video_id}", response_model=SummaryListResponse)
async def get_video_summaries(
    video_id: str = Path(..., description="YouTube video ID"),
):
    """Get all summaries for a specific video."""
    try:
        summaries_data = storage_service.list_summaries(video_id)
        
        # Convert to Pydantic models
        summaries = [SummaryResponse(**summary) for summary in summaries_data]
        
        return SummaryListResponse(
            video_id=video_id,
            summaries=summaries,
            total_summaries=len(summaries)
        )
        
    except Exception as e:
        logger.error(f"Failed to get summaries for video {video_id}: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to retrieve summaries: {str(e)}"
        )


@router.get("/video/{video_id}/{timestamp}", response_model=SummaryResponse)
async def get_specific_summary(
    video_id: str = Path(..., description="YouTube video ID"),
    timestamp: str = Path(..., description="Summary timestamp")
):
    """Get a specific summary by video ID and timestamp."""
    try:
        summary_data = storage_service.get_summary(video_id, timestamp)
        
        if not summary_data:
            raise HTTPException(
                status_code=404,
                detail=f"Summary not found for video {video_id} with timestamp {timestamp}"
            )
        
        return SummaryResponse(**summary_data)
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Failed to get summary {video_id}/{timestamp}: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to retrieve summary: {str(e)}"
        )


@router.get("/stats", response_model=SummaryStatsResponse)
async def get_summary_stats():
    """Get statistics about all stored summaries."""
    try:
        stats = storage_service.get_summary_stats()
        return SummaryStatsResponse(**stats)
        
    except Exception as e:
        logger.error(f"Failed to get summary stats: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to retrieve statistics: {str(e)}"
        )


@router.get("/videos", response_model=List[str])
async def list_videos_with_summaries():
    """Get list of video IDs that have summaries."""
    try:
        video_ids = storage_service.get_videos_with_summaries()
        return video_ids
        
    except Exception as e:
        logger.error(f"Failed to list videos with summaries: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to retrieve video list: {str(e)}"
        )


@router.delete("/video/{video_id}/{timestamp}")
async def delete_summary(
    video_id: str = Path(..., description="YouTube video ID"),
    timestamp: str = Path(..., description="Summary timestamp")
):
    """Delete a specific summary."""
    try:
        success = storage_service.delete_summary(video_id, timestamp)
        
        if not success:
            raise HTTPException(
                status_code=404,
                detail=f"Summary not found for video {video_id} with timestamp {timestamp}"
            )
        
        return {"message": f"Summary deleted successfully", "video_id": video_id, "timestamp": timestamp}
        
    except HTTPException:
        raise
    except Exception as e:
        logger.error(f"Failed to delete summary {video_id}/{timestamp}: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to delete summary: {str(e)}"
        )


@router.post("/video/{video_id}/generate")
async def trigger_summary_generation(
    video_id: str = Path(..., description="YouTube video ID"),
    force: bool = Query(False, description="Force regeneration even if summaries exist")
):
    """Trigger summary generation for a video."""
    try:
        # Check if summaries already exist
        existing_summaries = storage_service.list_summaries(video_id)
        
        if existing_summaries and not force:
            return {
                "message": "Summaries already exist for this video",
                "video_id": video_id,
                "existing_summaries": len(existing_summaries),
                "use_force_parameter": "Set force=true to regenerate"
            }
        
        # TODO: Integrate with actual summary generation pipeline
        # For now, return a placeholder response
        return {
            "message": "Summary generation would be triggered here",
            "video_id": video_id,
            "force": force,
            "note": "This endpoint will be connected to the DeepSeek summarization pipeline"
        }
        
    except Exception as e:
        logger.error(f"Failed to trigger summary generation for {video_id}: {e}")
        raise HTTPException(
            status_code=500,
            detail=f"Failed to trigger summary generation: {str(e)}"
        )