#!/usr/bin/env python3
"""
Forecast Processing Service
Version: 0.1.0
Status: Placeholder Implementation
"""
import logging
from dataclasses import dataclass
from datetime import datetime
from typing import Optional

logging.basicConfig(
    level=logging.INFO,
    format="%(asctime)s | %(levelname)s | %(name)s | %(message)s",
)

logger = logging.getLogger("forecast-engine")

@dataclass
class ForecastJob:
    customer: str
    forecast_month: str
    records: int = 0
    status: str = "Pending"

class ForecastEngine:
    def __init__(self):
        self.version = "0.1.0"

    def load_forecast(self) -> Optional[ForecastJob]:
        logger.info("Loading forecast data...")
        
        # TODO: Connect to SAP IBP       return ForecastJob(
            customer="PLACEHOLDER_CUSTOMER",
            forecast_month="2026-10"
        )

    def validate(self, job: ForecastJob) -> bool:
        logger.info("Validating forecast dataset...")
        
        # TODO: Add validation logic
        
        return True

    def process(self, job: ForecastJob) -> ForecastJob:
        logger.info("Running forecast calculations...")

        # TODO: Add business logic
        
        job.records = 1000
        job.status = "Processed"

        return job

    def publish(self, job: ForecastJob) -> None:
        logger.info(
            f"Publishing results | Customer={job.customer} | Records={job.records}"
        )

        # TODO: Upload to Power BI / SAP / Database


def main():
    logger.info("Forecast Engine Started")

    engine = ForecastEngine()

    job = engine.load_forecast()

    if job and engine.validate(job):
        result = engine.process(job)
        engine.publish(result)

    logger.info("Forecast Engine Completed")


if __name__ == "__main__":
    start_time = datetime.now()

    try:
        main()
    except Exception as ex:
        logger.exception(f"Application failed: {ex}")

    finally:
        duration = datetime.now() - start_time
        logger.info(f"Runtime: {duration}")