"""
AI Validators - Consolidated validation logic for all AI functions
"""
import logging
from typing import Dict, Any, Optional
from django.utils import timezone

logger = logging.getLogger(__name__)


def validate_ids(payload: dict, max_items: Optional[int] = None) -> Dict[str, Any]:
    """
    Base validation: checks for 'ids' array and max_items limit.
    
    Args:
        payload: Request payload containing 'ids' array
        max_items: Maximum number of items allowed (None = no limit)
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    ids = payload.get('ids', [])
    if not ids:
        return {'valid': False, 'error': 'No IDs provided'}
    
    if max_items and len(ids) > max_items:
        return {'valid': False, 'error': f'Maximum {max_items} items allowed'}
    
    return {'valid': True}


def validate_keywords_exist(ids: list, account=None) -> Dict[str, Any]:
    """
    Validate that keywords exist in database.
    
    Args:
        ids: List of keyword IDs
        account: Optional account for filtering
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    from igny8_core.modules.planner.models import Keywords
    
    queryset = Keywords.objects.filter(id__in=ids)
    if account:
        queryset = queryset.filter(account=account)
    
    if queryset.count() == 0:
        return {'valid': False, 'error': 'No keywords found'}
    
    return {'valid': True}


def validate_cluster_limits(account, operation_type: str = 'cluster') -> Dict[str, Any]:
    """
    Validate plan limits for cluster operations.
    
    Args:
        account: Account object
        operation_type: Type of operation ('cluster', 'idea', etc.)
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    if not account:
        return {'valid': False, 'error': 'Account is required'}
    
    plan = getattr(account, 'plan', None)
    if not plan:
        return {'valid': False, 'error': 'Account does not have an active plan'}
    
    if operation_type == 'cluster':
        from igny8_core.modules.planner.models import Clusters
        
        # Check daily cluster limit
        now = timezone.now()
        start_of_day = now.replace(hour=0, minute=0, second=0, microsecond=0)
        clusters_today = Clusters.objects.filter(
            account=account,
            created_at__gte=start_of_day
        ).count()
        
        if plan.daily_cluster_limit and clusters_today >= plan.daily_cluster_limit:
            return {
                'valid': False,
                'error': f'Daily cluster limit reached ({plan.daily_cluster_limit} clusters per day). Please try again tomorrow.'
            }
        
        # Check max clusters limit
        total_clusters = Clusters.objects.filter(account=account).count()
        if plan.max_clusters and total_clusters >= plan.max_clusters:
            return {
                'valid': False,
                'error': f'Maximum cluster limit reached ({plan.max_clusters} clusters). Please upgrade your plan or delete existing clusters.'
            }
    
    return {'valid': True}


def validate_cluster_exists(cluster_id: int, account=None) -> Dict[str, Any]:
    """
    Validate that a cluster exists.
    
    Args:
        cluster_id: Cluster ID
        account: Optional account for filtering
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    from igny8_core.modules.planner.models import Clusters
    
    queryset = Clusters.objects.filter(id=cluster_id)
    if account:
        queryset = queryset.filter(account=account)
    
    if not queryset.exists():
        return {'valid': False, 'error': 'Cluster not found'}
    
    return {'valid': True}


def validate_tasks_exist(task_ids: list, account=None) -> Dict[str, Any]:
    """
    Validate that tasks exist in database.
    
    Args:
        task_ids: List of task IDs
        account: Optional account for filtering
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    from igny8_core.modules.writer.models import Tasks
    
    queryset = Tasks.objects.filter(id__in=task_ids)
    if account:
        queryset = queryset.filter(account=account)
    
    if queryset.count() == 0:
        return {'valid': False, 'error': 'No tasks found'}
    
    return {'valid': True}


def validate_api_key(api_key: Optional[str], integration_type: str = 'openai') -> Dict[str, Any]:
    """
    Validate that API key is configured.
    
    Args:
        api_key: API key to validate
        integration_type: Type of integration ('openai', 'runware')
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    if not api_key:
        return {
            'valid': False,
            'error': f'{integration_type.upper()} API key not configured'
        }
    
    return {'valid': True}


def validate_model(model: str, model_type: str = 'text') -> Dict[str, Any]:
    """
    Validate that model is in supported list.
    
    Args:
        model: Model name to validate
        model_type: Type of model ('text' or 'image')
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    from .constants import MODEL_RATES, VALID_OPENAI_IMAGE_MODELS
    
    if model_type == 'text':
        if model not in MODEL_RATES:
            return {
                'valid': False,
                'error': f'Model "{model}" is not in supported models list'
            }
    elif model_type == 'image':
        if model not in VALID_OPENAI_IMAGE_MODELS:
            return {
                'valid': False,
                'error': f'Model "{model}" is not valid for OpenAI image generation. Only {", ".join(VALID_OPENAI_IMAGE_MODELS)} are supported.'
            }
    
    return {'valid': True}


def validate_image_size(size: str, model: str) -> Dict[str, Any]:
    """
    Validate that image size is valid for the selected model.
    
    Args:
        size: Image size (e.g., '1024x1024')
        model: Model name
    
    Returns:
        Dict with 'valid' (bool) and optional 'error' (str)
    """
    from .constants import VALID_SIZES_BY_MODEL
    
    valid_sizes = VALID_SIZES_BY_MODEL.get(model, [])
    if size not in valid_sizes:
        return {
            'valid': False,
            'error': f'Image size "{size}" is not valid for model "{model}". Valid sizes are: {", ".join(valid_sizes)}'
        }
    
    return {'valid': True}