"""API endpoints for event management."""

from fastapi import APIRouter, Depends, HTTPException, Query
from sqlalchemy.orm import Session
from typing import Optional
import json

from app.database import get_db
from app.schemas import EventCreate, EventResponse, EventListResponse
from app.crud import create_event, get_events, get_event_by_id, delete_all_events, get_statistics
from app.websocket import manager

router = APIRouter(prefix="/api/events", tags=["events"])


@router.post("", response_model=EventResponse, status_code=201)
async def create_event_endpoint(event: EventCreate, db: Session = Depends(get_db)):
    """
    Create a new event.

    This endpoint is called by Claude Code hook scripts to report events.
    """
    try:
        # Create event in database
        db_event = create_event(db, event)

        # Convert event to dict for WebSocket
        # Try to parse tool_input as JSON, but keep as string if it fails
        tool_input_value = None
        if db_event.tool_input:
            try:
                tool_input_value = json.loads(db_event.tool_input)
            except (json.JSONDecodeError, TypeError):
                tool_input_value = db_event.tool_input

        event_dict = {
            "id": db_event.id,
            "session_id": db_event.session_id,
            "event_type": db_event.event_type,
            "tool_name": db_event.tool_name,
            "tool_input": tool_input_value,
            "tool_output": db_event.tool_output,
            "success": db_event.success,
            "description": db_event.description,
            "timestamp": db_event.timestamp,
            "created_at": db_event.created_at.isoformat() if db_event.created_at else None,
        }

        # Get updated statistics
        stats = get_statistics(db)
        stats_dict = {
            "total_events": stats.total_events,
            "total_tools_used": stats.total_tools_used,
            "total_agents": stats.total_agents,
            "total_sessions": stats.total_sessions,
            "last_updated": stats.last_updated,
        }

        # Broadcast to WebSocket clients
        await manager.broadcast_event(event_dict, stats_dict)

        return db_event
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error creating event: {str(e)}")


@router.get("", response_model=EventListResponse)
async def list_events(
    skip: int = Query(0, ge=0, description="Number of events to skip"),
    limit: int = Query(50, ge=1, le=100, description="Maximum number of events to return"),
    event_type: Optional[str] = Query(None, description="Filter by event type (comma-separated for multiple)"),
    session_id: Optional[str] = Query(None, description="Filter by session ID"),
    tool_name: Optional[str] = Query(None, description="Filter by tool name"),
    db: Session = Depends(get_db),
):
    """
    Get a paginated list of events with optional filtering.

    Supports filtering by:
    - event_type: Single type or comma-separated list (e.g., "PreToolUse,PostToolUse")
    - session_id: Filter events from a specific session
    - tool_name: Filter events for a specific tool
    """
    try:
        events, total = get_events(
            db,
            skip=skip,
            limit=limit,
            event_type=event_type,
            session_id=session_id,
            tool_name=tool_name,
        )

        # Convert to response format
        event_responses = []
        for event in events:
            # Try to parse tool_input as JSON, but keep as string if it fails
            tool_input_value = None
            if event.tool_input:
                try:
                    tool_input_value = json.loads(event.tool_input)
                except (json.JSONDecodeError, TypeError):
                    tool_input_value = event.tool_input

            event_dict = {
                "id": event.id,
                "session_id": event.session_id,
                "event_type": event.event_type,
                "tool_name": event.tool_name,
                "tool_input": tool_input_value,
                "tool_output": event.tool_output,
                "success": event.success,
                "description": event.description,
                "timestamp": event.timestamp,
                "created_at": event.created_at,
            }
            event_responses.append(EventResponse(**event_dict))

        return EventListResponse(
            events=event_responses,
            total=total,
            page=skip // limit + 1,
            page_size=limit,
            has_more=(skip + limit) < total,
        )
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error fetching events: {str(e)}")


@router.get("/{event_id}", response_model=EventResponse)
async def get_event(event_id: int, db: Session = Depends(get_db)):
    """Get a single event by ID."""
    event = get_event_by_id(db, event_id)
    if not event:
        raise HTTPException(status_code=404, detail="Event not found")

    return event


@router.delete("/reset", status_code=204)
async def reset_stats(db: Session = Depends(get_db)):
    """
    Reset all statistics by deleting all events.

    This is used by the "Reset Stats" button in the frontend.
    """
    try:
        delete_all_events(db)

        # Broadcast reset notification to all clients
        await manager.broadcast_stats_reset()

        return None
    except Exception as e:
        raise HTTPException(status_code=500, detail=f"Error resetting stats: {str(e)}")