# Copyright (c) 2025 Patrick Motsch
# All rights reserved.
"""
Main workflow service - handles workflow execution, scheduling, and chat playground operations.

Combines functionality from:
- mainAutomation.py: Automation workflow execution and scheduling
- mainChatPlayground.py: Chat playground workflow start/stop operations
"""

import logging
import json
from typing import Dict, Any, Optional

from modules.datamodels.datamodelChat import ChatWorkflow, UserInputRequest, WorkflowModeEnum, AutomationDefinition
from modules.datamodels.datamodelUam import User
from modules.shared.timeUtils import getUtcTimestamp
from modules.shared.eventManagement import eventManager
from modules.services import getInterface as getServices
from modules.workflows.workflowManager import WorkflowManager
from .subAutomationUtils import parseScheduleToCron, planToPrompt, replacePlaceholders

logger = logging.getLogger(__name__)


async def chatStart(currentUser: User, userInput: UserInputRequest, workflowMode: WorkflowModeEnum, workflowId: Optional[str] = None) -> ChatWorkflow:
    """
    Starts a new chat or continues an existing one, then launches processing asynchronously.
    
    Args:
        currentUser: Current user
        userInput: User input request
        workflowId: Optional workflow ID to continue existing workflow
        workflowMode: "Dynamic" for iterative dynamic-style processing, "Automation" for automated workflow execution
    
    Example usage for Dynamic mode:
        workflow = await chatStart(currentUser, userInput, workflowMode=WorkflowModeEnum.WORKFLOW_DYNAMIC)
    """
    try:
        services = getServices(currentUser, None)
        workflowManager = WorkflowManager(services)
        workflow = await workflowManager.workflowStart(userInput, workflowMode, workflowId)
        return workflow
    except Exception as e:
        logger.error(f"Error starting chat: {str(e)}")
        raise

async def chatStop(currentUser: User, workflowId: str) -> ChatWorkflow:
    """Stops a running chat."""
    try:
        services = getServices(currentUser, None)
        workflowManager = WorkflowManager(services)
        return await workflowManager.workflowStop(workflowId)
    except Exception as e:
        logger.error(f"Error stopping chat: {str(e)}")
        raise


async def executeAutomation(automationId: str, services) -> ChatWorkflow:
    """Execute automation workflow immediately (test mode) with placeholder replacement.
    
    Args:
        automationId: ID of automation to execute
        services: Services instance for data access
    
    Returns:
        ChatWorkflow instance created by automation execution
    """
    executionStartTime = getUtcTimestamp()
    executionLog = {
        "timestamp": executionStartTime,
        "workflowId": None,
        "status": "running",
        "messages": []
    }
    
    try:
        # 1. Load automation definition
        automation = services.interfaceDbChat.getAutomationDefinition(automationId)
        if not automation:
            raise ValueError(f"Automation {automationId} not found")
        
        executionLog["messages"].append(f"Started execution at {executionStartTime}")
        
        # 2. Replace placeholders in template to generate plan
        template = automation.template or ""
        placeholders = automation.placeholders or {}
        planJson = replacePlaceholders(template, placeholders)
        try:
            plan = json.loads(planJson)
        except json.JSONDecodeError as e:
            logger.error(f"Failed to parse plan JSON after placeholder replacement: {str(e)}")
            logger.error(f"Template: {template[:500]}...")
            logger.error(f"Placeholders: {placeholders}")
            logger.error(f"Generated planJson (first 1000 chars): {planJson[:1000]}")
            logger.error(f"Error position: line {e.lineno}, column {e.colno}, char {e.pos}")
            if e.pos:
                start = max(0, e.pos - 100)
                end = min(len(planJson), e.pos + 100)
                logger.error(f"Context around error: ...{planJson[start:end]}...")
            raise ValueError(f"Invalid JSON after placeholder replacement: {str(e)}")
        executionLog["messages"].append("Template placeholders replaced successfully")
        
        # 3. Get user who created automation
        creatorUserId = getattr(automation, "_createdBy", None)
        
        # CRITICAL: Automation MUST run as creator user only, or fail
        if not creatorUserId:
            errorMsg = f"Automation {automationId} has no creator user (_createdBy field missing). Cannot execute automation."
            logger.error(errorMsg)
            executionLog["messages"].append(errorMsg)
            raise ValueError(errorMsg)
        
        # Get user from database using services
        creatorUser = services.interfaceDbApp.getUser(creatorUserId)
        if not creatorUser:
            raise ValueError(f"Creator user {creatorUserId} not found")
        
        executionLog["messages"].append(f"Using creator user: {creatorUserId}")
        
        # 4. Create UserInputRequest from plan
        # Embed plan JSON in prompt for TemplateMode to extract
        promptText = planToPrompt(plan)
        planJsonStr = json.dumps(plan)
        # Embed plan as JSON comment so TemplateMode can extract it
        promptWithPlan = f"{promptText}\n\n<!--TEMPLATE_PLAN_START-->\n{planJsonStr}\n<!--TEMPLATE_PLAN_END-->"
        
        userInput = UserInputRequest(
            prompt=promptWithPlan,
            listFileId=[],
            userLanguage=creatorUser.language or "en"
        )
        
        executionLog["messages"].append("Starting workflow execution")
        
        # 5. Start workflow using chatStart
        workflow = await chatStart(
            currentUser=creatorUser,
            userInput=userInput,
            workflowMode=WorkflowModeEnum.WORKFLOW_AUTOMATION,
            workflowId=None
        )
        
        executionLog["workflowId"] = workflow.id
        executionLog["status"] = "completed"
        executionLog["messages"].append(f"Workflow {workflow.id} started successfully")
        logger.info(f"Started workflow {workflow.id} with plan containing {len(plan.get('tasks', []))} tasks (plan embedded in userInput)")
        
        # Set workflow name with "automated" prefix
        automationLabel = automation.label or "Unknown Automation"
        workflowName = f"automated: {automationLabel}"
        workflow = services.interfaceDbChat.updateWorkflow(workflow.id, {"name": workflowName})
        logger.info(f"Set workflow {workflow.id} name to: {workflowName}")
        
        # Update automation with execution log
        executionLogs = list(automation.executionLogs or [])
        executionLogs.append(executionLog)
        # Keep only last 50 executions
        if len(executionLogs) > 50:
            executionLogs = executionLogs[-50:]
        
        services.interfaceDbChat.updateAutomationDefinition(
            automationId,
            {"executionLogs": executionLogs}
        )
        
        return workflow
    except Exception as e:
        # Log error to execution log
        executionLog["status"] = "error"
        executionLog["messages"].append(f"Error: {str(e)}")
        
        # Update automation with execution log even on error
        try:
            automation = services.interfaceDbChat.getAutomationDefinition(automationId)
            if automation:
                executionLogs = list(automation.executionLogs or [])
                executionLogs.append(executionLog)
                if len(executionLogs) > 50:
                    executionLogs = executionLogs[-50:]
                services.interfaceDbChat.updateAutomationDefinition(
                    automationId,
                    {"executionLogs": executionLogs}
                )
        except Exception as logError:
            logger.error(f"Error saving execution log: {str(logError)}")
        
        raise


async def syncAutomationEvents(services, eventUser) -> Dict[str, Any]:
    """Automation event handler - syncs scheduler with all active automations.
    
    Args:
        services: Services instance for data access
        eventUser: System-level event user for accessing automations
    
    Returns:
        Dictionary with sync results (synced count and event IDs)
    """
    # Get all automation definitions filtered by RBAC (for current mandate)
    filtered = services.interfaceDbChat.getAllAutomationDefinitionsWithRBAC(eventUser)
    
    registeredEvents = {}
    
    for automation in filtered:
        automationId = automation.id
        isActive = automation.active if hasattr(automation, 'active') else False
        currentEventId = automation.eventId if hasattr(automation, 'eventId') else None
        schedule = automation.schedule if hasattr(automation, 'schedule') else None
        
        if not schedule:
            logger.warning(f"Automation {automationId} has no schedule, skipping")
            continue
        
        try:
            # Parse schedule to cron kwargs
            cronKwargs = parseScheduleToCron(schedule)
            
            if isActive:
                # Remove existing event if present (handles schedule changes)
                if currentEventId:
                    try:
                        eventManager.remove(currentEventId)
                    except Exception as e:
                        logger.warning(f"Error removing old event {currentEventId}: {str(e)}")
                
                # Register new event
                newEventId = f"automation.{automationId}"
                
                # Create event handler function
                handler = createAutomationEventHandler(automationId, eventUser)
                
                # Register cron job
                eventManager.registerCron(
                    jobId=newEventId,
                    func=handler,
                    cronKwargs=cronKwargs,
                    replaceExisting=True
                )
                
                # Update automation with new eventId
                if currentEventId != newEventId:
                    services.interfaceDbChat.updateAutomationDefinition(
                        automationId,
                        {"eventId": newEventId}
                    )
                
                registeredEvents[automationId] = newEventId
            else:
                # Remove event if exists
                if currentEventId:
                    try:
                        eventManager.remove(currentEventId)
                        services.interfaceDbChat.updateAutomationDefinition(
                            automationId,
                            {"eventId": None}
                        )
                    except Exception as e:
                        logger.warning(f"Error removing event {currentEventId}: {str(e)}")
        except Exception as e:
            logger.error(f"Error syncing automation {automationId}: {str(e)}")
    
    return {
        "synced": len(registeredEvents),
        "events": registeredEvents
    }


def createAutomationEventHandler(automationId: str, eventUser):
    """Create event handler function for a specific automation.
    
    Args:
        automationId: ID of automation to create handler for
        eventUser: System-level event user for accessing automations (captured in closure)
    
    Returns:
        Async handler function for scheduled automation execution
    """
    async def handler():
        try:
            if not eventUser:
                logger.error("Event user not available for automation execution")
                return
            
            # Get services for event user (provides access to interfaces)
            eventServices = getServices(eventUser, None)
            
            # Load automation using event user context
            automation = eventServices.interfaceDbChat.getAutomationDefinition(automationId)
            if not automation or not getattr(automation, "active", False):
                logger.warning(f"Automation {automationId} not found or not active, skipping execution")
                return
            
            # Get creator user
            creatorUserId = getattr(automation, "_createdBy", None)
            if not creatorUserId:
                logger.error(f"Automation {automationId} has no creator user")
                return
            
            # Get creator user from database using services
            eventServices = getServices(eventUser, None)
            creatorUser = eventServices.interfaceDbApp.getUser(creatorUserId)
            if not creatorUser:
                logger.error(f"Creator user {creatorUserId} not found for automation {automationId}")
                return
            
            # Get services for creator user (provides access to interfaces)
            creatorServices = getServices(creatorUser, None)
            
            # Execute automation with creator user's context
            # executeAutomation is in same module, so we can call it directly
            await executeAutomation(automationId, creatorServices)
            logger.info(f"Successfully executed automation {automationId} as user {creatorUserId}")
        except Exception as e:
            logger.error(f"Error executing automation {automationId}: {str(e)}")
    
    return handler