"""
Enterprise Orchestrator - Robot Management & Job Scheduling

Enterprise-grade orchestration capabilities:
- Robot registration and health monitoring
- Job scheduling (cron, interval, event-triggered)
- Distributed execution
- SLA management
- Auto-scaling

Reference: ITEM_PIPELINE_SPEC.md Section 16
"""

from dataclasses import dataclass, field
from datetime import datetime, timedelta
from enum import Enum
from typing import Any, Dict, List, Optional


class RobotType(Enum):
    """Robot execution modes."""
    ATTENDED = "attended"       # Interactive mode (human supervision)
    UNATTENDED = "unattended"   # Background execution
    DEVELOPMENT = "development"  # Development/testing


class RobotStatus(Enum):
    """Robot status."""
    AVAILABLE = "available"
    BUSY = "busy"
    OFFLINE = "offline"
    MAINTENANCE = "maintenance"
    DISCONNECTED = "disconnected"


class JobStatus(Enum):
    """Job execution status."""
    PENDING = "pending"
    QUEUED = "queued"
    RUNNING = "running"
    COMPLETED = "completed"
    FAILED = "failed"
    CANCELLED = "cancelled"
    TIMEOUT = "timeout"


class ScheduleType(Enum):
    """Schedule trigger types."""
    CRON = "cron"           # Cron expression
    INTERVAL = "interval"   # Fixed interval
    ONCE = "once"           # One-time execution
    EVENT = "event"         # Event-triggered


@dataclass
class RobotCapabilities:
    """Robot capabilities declaration."""
    browser: bool = True
    desktop: bool = False
    vision: bool = False
    ai: bool = False
    custom: List[str] = field(default_factory=list)


@dataclass
class Robot:
    """Robot (execution agent) definition."""
    robot_id: str
    name: str
    machine_name: str
    robot_type: RobotType = RobotType.UNATTENDED

    # Status
    status: RobotStatus = RobotStatus.OFFLINE
    last_heartbeat: Optional[datetime] = None
    current_job_id: Optional[str] = None

    # Capabilities
    capabilities: RobotCapabilities = field(default_factory=RobotCapabilities)
    environments: List[str] = field(default_factory=lambda: ["production"])

    # Resources
    max_concurrent_jobs: int = 1
    current_load: int = 0

    # Metadata
    version: Optional[str] = None
    platform: Optional[str] = None  # "windows" | "macos" | "linux"
    registered_at: Optional[datetime] = None

    @property
    def is_available(self) -> bool:
        """Check if robot can accept jobs."""
        return (
            self.status == RobotStatus.AVAILABLE and
            self.current_load < self.max_concurrent_jobs
        )


@dataclass
class RobotRequirements:
    """Requirements for robot assignment."""
    capabilities: List[str] = field(default_factory=list)
    environments: List[str] = field(default_factory=lambda: ["production"])
    preferred_robots: List[str] = field(default_factory=list)
    excluded_robots: List[str] = field(default_factory=list)
    min_version: Optional[str] = None


@dataclass
class RetryPolicy:
    """Job retry configuration."""
    max_retries: int = 3
    retry_delay_seconds: int = 60
    backoff_multiplier: float = 2.0
    max_delay_seconds: int = 3600
    retry_on: List[str] = field(default_factory=lambda: ["timeout", "system_error"])


@dataclass
class ScheduledJob:
    """Scheduled job definition."""
    job_id: str
    workflow_id: str
    name: str

    # Schedule configuration
    schedule_type: ScheduleType = ScheduleType.CRON
    cron_expression: Optional[str] = None      # For CRON type
    interval_seconds: Optional[int] = None     # For INTERVAL type
    run_at: Optional[datetime] = None          # For ONCE type
    trigger_event: Optional[str] = None        # For EVENT type

    # Execution configuration
    params: Dict[str, Any] = field(default_factory=dict)
    robot_requirements: Optional[RobotRequirements] = None
    timeout_minutes: int = 60
    retry_policy: Optional[RetryPolicy] = None

    # SLA
    sla_deadline_minutes: Optional[int] = None
    priority: int = 5  # 1-10, 10 = highest

    # Status
    enabled: bool = True
    last_run: Optional[datetime] = None
    last_run_status: Optional[JobStatus] = None
    next_run: Optional[datetime] = None

    # Metadata
    created_at: Optional[datetime] = None
    created_by: Optional[str] = None
    updated_at: Optional[datetime] = None


@dataclass
class JobExecution:
    """Single job execution instance."""
    execution_id: str
    job_id: str
    workflow_id: str

    # Execution details
    status: JobStatus = JobStatus.PENDING
    robot_id: Optional[str] = None
    started_at: Optional[datetime] = None
    completed_at: Optional[datetime] = None
    duration_ms: int = 0

    # Input/Output
    params: Dict[str, Any] = field(default_factory=dict)
    result: Optional[Dict[str, Any]] = None
    error: Optional[str] = None

    # Retry info
    attempt_number: int = 1
    max_attempts: int = 1

    # Trigger info
    trigger_type: str = "manual"  # "scheduled" | "manual" | "api" | "event"
    triggered_by: Optional[str] = None


@dataclass
class OrchestratorStats:
    """Orchestrator statistics."""
    timestamp: datetime

    # Robot stats
    total_robots: int = 0
    available_robots: int = 0
    busy_robots: int = 0
    offline_robots: int = 0

    # Job stats
    jobs_pending: int = 0
    jobs_running: int = 0
    jobs_completed_today: int = 0
    jobs_failed_today: int = 0

    # Performance
    avg_job_duration_ms: int = 0
    avg_queue_time_ms: int = 0
    success_rate_today: float = 0.0


class RobotManager:
    """
    Robot management interface.

    Handles robot registration, health monitoring, and assignment.
    """

    async def register(self, robot: Robot) -> str:
        """
        Register a new robot.

        Args:
            robot: Robot to register

        Returns:
            Robot ID
        """
        raise NotImplementedError("Implementation required")

    async def unregister(self, robot_id: str) -> bool:
        """
        Unregister a robot.

        Args:
            robot_id: Robot to unregister

        Returns:
            True if successful
        """
        raise NotImplementedError("Implementation required")

    async def heartbeat(
        self,
        robot_id: str,
        status: RobotStatus,
        metrics: Dict[str, Any] = None,
    ) -> None:
        """
        Update robot heartbeat.

        Args:
            robot_id: Robot ID
            status: Current status
            metrics: Optional performance metrics
        """
        raise NotImplementedError("Implementation required")

    async def get_robot(self, robot_id: str) -> Optional[Robot]:
        """Get robot by ID."""
        raise NotImplementedError("Implementation required")

    async def get_available_robots(
        self,
        requirements: RobotRequirements = None,
    ) -> List[Robot]:
        """
        Get available robots matching requirements.

        Args:
            requirements: Optional capability requirements

        Returns:
            List of available robots
        """
        raise NotImplementedError("Implementation required")

    async def assign_job(
        self,
        robot_id: str,
        execution_id: str,
    ) -> bool:
        """
        Assign job to robot.

        Args:
            robot_id: Robot to assign
            execution_id: Job execution ID

        Returns:
            True if successful
        """
        raise NotImplementedError("Implementation required")

    async def release_robot(self, robot_id: str) -> bool:
        """
        Release robot after job completion.

        Args:
            robot_id: Robot to release

        Returns:
            True if successful
        """
        raise NotImplementedError("Implementation required")


class Scheduler:
    """
    Job scheduling interface.

    Manages scheduled jobs and triggers.
    """

    async def create_schedule(self, job: ScheduledJob) -> str:
        """
        Create a new scheduled job.

        Args:
            job: Job definition

        Returns:
            Job ID
        """
        raise NotImplementedError("Implementation required")

    async def update_schedule(
        self,
        job_id: str,
        updates: Dict[str, Any],
    ) -> ScheduledJob:
        """
        Update scheduled job.

        Args:
            job_id: Job to update
            updates: Fields to update

        Returns:
            Updated job
        """
        raise NotImplementedError("Implementation required")

    async def delete_schedule(self, job_id: str) -> bool:
        """
        Delete scheduled job.

        Args:
            job_id: Job to delete

        Returns:
            True if successful
        """
        raise NotImplementedError("Implementation required")

    async def enable_schedule(self, job_id: str) -> ScheduledJob:
        """Enable a disabled schedule."""
        raise NotImplementedError("Implementation required")

    async def disable_schedule(self, job_id: str) -> ScheduledJob:
        """Disable a schedule."""
        raise NotImplementedError("Implementation required")

    async def trigger_now(
        self,
        job_id: str,
        params: Dict[str, Any] = None,
    ) -> JobExecution:
        """
        Trigger job immediately.

        Args:
            job_id: Job to trigger
            params: Optional parameter overrides

        Returns:
            Created execution
        """
        raise NotImplementedError("Implementation required")

    async def get_schedule(self, job_id: str) -> Optional[ScheduledJob]:
        """Get scheduled job by ID."""
        raise NotImplementedError("Implementation required")

    async def list_schedules(
        self,
        workflow_id: str = None,
        enabled_only: bool = False,
    ) -> List[ScheduledJob]:
        """
        List scheduled jobs.

        Args:
            workflow_id: Filter by workflow
            enabled_only: Only enabled schedules

        Returns:
            List of scheduled jobs
        """
        raise NotImplementedError("Implementation required")

    async def get_upcoming_jobs(
        self,
        hours: int = 24,
    ) -> List[ScheduledJob]:
        """
        Get jobs scheduled to run within time window.

        Args:
            hours: Time window in hours

        Returns:
            List of upcoming jobs
        """
        raise NotImplementedError("Implementation required")

    async def get_execution(
        self,
        execution_id: str,
    ) -> Optional[JobExecution]:
        """Get job execution by ID."""
        raise NotImplementedError("Implementation required")

    async def list_executions(
        self,
        job_id: str = None,
        status: JobStatus = None,
        limit: int = 100,
    ) -> List[JobExecution]:
        """
        List job executions.

        Args:
            job_id: Filter by job
            status: Filter by status
            limit: Maximum results

        Returns:
            List of executions
        """
        raise NotImplementedError("Implementation required")

    async def cancel_execution(
        self,
        execution_id: str,
        reason: str = None,
    ) -> JobExecution:
        """
        Cancel a running execution.

        Args:
            execution_id: Execution to cancel
            reason: Optional cancellation reason

        Returns:
            Cancelled execution
        """
        raise NotImplementedError("Implementation required")


class Orchestrator:
    """
    Main orchestrator interface.

    Coordinates robots, jobs, and executions.
    """

    def __init__(
        self,
        robot_manager: RobotManager = None,
        scheduler: Scheduler = None,
    ):
        self.robots = robot_manager
        self.scheduler = scheduler

    async def get_stats(self) -> OrchestratorStats:
        """Get current orchestrator statistics."""
        raise NotImplementedError("Implementation required")

    async def dispatch_job(
        self,
        execution: JobExecution,
    ) -> bool:
        """
        Dispatch job to available robot.

        Args:
            execution: Job execution to dispatch

        Returns:
            True if dispatched successfully
        """
        raise NotImplementedError("Implementation required")

    async def process_queue(self) -> int:
        """
        Process pending job queue.

        Returns:
            Number of jobs dispatched
        """
        raise NotImplementedError("Implementation required")


__all__ = [
    # Enums
    'RobotType',
    'RobotStatus',
    'JobStatus',
    'ScheduleType',
    # Data structures
    'RobotCapabilities',
    'Robot',
    'RobotRequirements',
    'RetryPolicy',
    'ScheduledJob',
    'JobExecution',
    'OrchestratorStats',
    # Interfaces
    'RobotManager',
    'Scheduler',
    'Orchestrator',
]
