from datetime import datetime

from core_domain import ScheduledJobStatus, ScheduledJobType
from core_shared.task_queue import TaskQueuePublisher

from app.db.models import ScheduledJob
from app.domain.repositories import ScheduledJobRepository
from app.schemas.scheduler import (
    DueJobClaimRequest,
    ScheduledJobCreateRequest,
    ScheduledJobStatusUpdateRequest,
)


class SchedulerApplicationService:
    def __init__(
        self,
        *,
        job_repository: ScheduledJobRepository,
        task_queue_publisher: TaskQueuePublisher | None = None) -> None:
        self.job_repository = job_repository
        self.task_queue_publisher = task_queue_publisher

    def create_job(self, payload: ScheduledJobCreateRequest) -> ScheduledJob:
        job = self.job_repository.create(
            job_type=payload.job_type,
            name=payload.name,
            description=payload.description,
            target_service=payload.target_service,
            target_url=payload.target_url,
            method=payload.method,
            payload_json=payload.payload_json,
            schedule_time=payload.schedule_time,
            max_attempts=payload.max_attempts,
            metadata_json=payload.metadata_json)
        if self.task_queue_publisher is not None:
            self.task_queue_publisher.publish_scheduled_job(
                scheduled_job_id=job.id)
        return job

    def list_jobs(
        self,
        *,
        status: ScheduledJobStatus | None,
        job_type: ScheduledJobType | None,
        limit: int) -> list[ScheduledJob]:
        return self.job_repository.list_by_scope(
            status=status,
            job_type=job_type,
            limit=limit)

    def claim_due_jobs(self, payload: DueJobClaimRequest) -> list[ScheduledJob]:
        return self.job_repository.claim_due_jobs(
            worker_key=payload.worker_key,
            lease_seconds=payload.lease_seconds,
            limit=payload.limit,
            now_time=payload.now_time or datetime.utcnow())

    def update_job_status(
        self,
        *,
        job_id: str,
        payload: ScheduledJobStatusUpdateRequest) -> ScheduledJob | None:
        entity = self.job_repository.get_by_id(job_id=job_id)
        if entity is None:
            return None
        return self.job_repository.update_status(
            job_id=job_id,
            status=payload.status,
            last_error_message=payload.last_error_message)