"""
NoETL Dashboard API Service - Business logic for dashboard operations.

Handles:
- Dashboard statistics computation
- Widget data retrieval
- Execution summaries
- Health checks
"""

from typing import List
from noetl.core.logger import setup_logger
from .schema import (
    DashboardStatsResponse,
    DashboardWidget,
    DashboardWidgetsResponse,
    HealthCheckResponse
)

logger = setup_logger(__name__, include_location=True)


class DashboardService:
    """Service class for dashboard operations."""
    
    @staticmethod
    async def get_dashboard_stats() -> DashboardStatsResponse:
        """
        Get dashboard statistics.
        
        This is a placeholder implementation that returns zero counts.
        In production, this should query the database for actual statistics.
        
        Returns:
            DashboardStatsResponse with statistics
        """
        try:
            # TODO: Implement actual statistics queries
            # Example queries:
            # - SELECT COUNT(*) FROM noetl.event WHERE event_type = 'execution_start'
            # - SELECT COUNT(*) FROM noetl.catalog WHERE kind = 'Playbook'
            # - SELECT COUNT(*) FROM noetl.event WHERE status = 'running'
            
            return DashboardStatsResponse(
                status="ok",
                stats={
                    "total_executions": 0,
                    "successful_executions": 0,
                    "failed_executions": 0,
                    "total_playbooks": 0,
                    "active_workflows": 0
                },
                total_executions=0,
                successful_executions=0,
                failed_executions=0,
                total_playbooks=0,
                active_workflows=0
            )
        except Exception as e:
            logger.error(f"Error getting dashboard stats: {e}")
            # Return empty stats on error
            return DashboardStatsResponse(
                status="error",
                stats={},
                total_executions=0,
                successful_executions=0,
                failed_executions=0,
                total_playbooks=0,
                active_workflows=0
            )
    
    @staticmethod
    async def get_dashboard_widgets() -> DashboardWidgetsResponse:
        """
        Get dashboard widgets configuration.
        
        This is a placeholder implementation that returns an empty list.
        In production, this should return configured widgets with their data.
        
        Returns:
            DashboardWidgetsResponse with widgets
        """
        try:
            # TODO: Implement actual widget retrieval
            # Example widgets:
            # - Execution trend chart
            # - Recent executions table
            # - Success rate metric
            # - Resource utilization graphs
            
            return DashboardWidgetsResponse(
                widgets=[]
            )
        except Exception as e:
            logger.error(f"Error getting dashboard widgets: {e}")
            return DashboardWidgetsResponse(
                widgets=[]
            )
    
    @staticmethod
    async def health_check() -> HealthCheckResponse:
        """
        Perform health check.
        
        Returns:
            HealthCheckResponse with status
        """
        return HealthCheckResponse(
            status="ok"
        )
