from typing import Optional, List, Dict
from backend.services.template_message_service import TemplateMessageService
from backend.models.models import MessageTemplateDoc
from common.log.module_logger import ModuleLogger
from datetime import datetime, timezone
from common.constants.region import UserRegion


class TemplateMessageManager:
    def __init__(self):
        self.template_message_service = TemplateMessageService()
        self.module_logger = ModuleLogger(sender_id="TemplateMessageManager")

    async def verify_tenant_access(self, template_id: str, tenant_id: str, region: int) -> Optional[MessageTemplateDoc]:
        """get template by tenant and template ids with region"""
        if not template_id or not tenant_id:
            raise ValueError("template_id and tenant_id are required")
        
        template = await self.template_message_service.verify_tenant_access(template_id, tenant_id, region)
        await self.module_logger.log_info(
            info="Template retrieved by tenant and ID",
            properties={"template_id": template_id, "tenant_id": tenant_id, "region": region}
        )
        
        return template
# ==================== global templates ====================
    async def create_global_template_from_data(
        self,
        template_id: str,
        region: int,
        subject: str,
        body: str,
        is_active: bool = True
    ):
        """create global template from data"""
        template = MessageTemplateDoc(
            template_id=template_id,
            tenant_id=None,  
            region=region,
            subject=subject,
            body=body,
            is_active=is_active,
            created_at=datetime.now(timezone.utc)
        )
        
        result = await self.template_message_service.create_global_template(template)
        action = "skipped" if hasattr(result, "_is_existing") and result._is_existing else "created"
        await self.module_logger.log_info(
            info=f"Global template {action}",
            properties={"template_id": template_id, "region": region, "action": action}
        )
        
        return result

    async def update_global_template(self, template_id: str, data: dict, region: int):
        """update global template"""
        if not data.get("subject") and not data.get("body"):
            raise ValueError("At least subject or body must be provided")
        
        result = await self.template_message_service.update_global_template(template_id, data, region)
        
        await self.module_logger.log_info(
            info="Global template updated",
            properties={"template_id": template_id, "updated_fields": list(data.keys())}
        )
        
        return result

    async def delete_global_template(self, template_id: str):
        """delete global template"""
        
        result = await self.template_message_service.delete_global_template(template_id)
        
        await self.module_logger.log_info(
            info="Global template deleted",
            properties={"template_id": template_id}
        )
        
        return result

    async def list_global_templates(self, region: int):
        """list global templates"""
        templates = await self.template_message_service.list_global_templates(region)
        
        formatted_templates = []
        for template in templates:
            formatted_templates.append({
                "id": str(template.id),
                "template_id": template.template_id,
                "subject": template.subject,
                "region": template.region.value if hasattr(template.region, 'value') else template.region,
                "is_active": template.is_active,
                "created_at": template.created_at.isoformat() if template.created_at else None
            })
        
        return formatted_templates
        
# ==================== TENANT templates ====================
    
    async def list_tenant_templates(self, tenant_id: str, region: int):
        """list tenant templates"""
        
        templates = await self.template_message_service.list_tenant_templates(tenant_id, region)
        
        formatted_templates = []
        for template in templates:
            formatted_templates.append({
                "id": str(template.id),
                "template_id": template.template_id,
                "subject": template.subject,
                "region": template.region.value if hasattr(template.region, 'value') else template.region,
                "is_active": template.is_active,
                "created_at": template.created_at.isoformat() if template.created_at else None
            })
        
        return formatted_templates

    async def assign_templates_to_tenant(self, tenant_id: str, template_ids: List[str], region: int):
        """assign templates to tenant"""
        if not template_ids:
            raise ValueError("Template IDs cannot be empty")
        
        results = await self.template_message_service.assign_template_to_tenant(tenant_id, template_ids, region)
        
        success_count = sum(1 for r in results if r.get("success"))
        await self.module_logger.log_info(
            info="Templates assigned to tenant",
            properties={
                "tenant_id": tenant_id,
                "region": region,
                "total_requested": len(template_ids),
                "success_count": success_count
            }
        )
        
        return results

    async def create_tenant_template_from_data(
        self,
        template_id: str,
        region: int,
        subject: str,
        body: str,
        tenant_id: str,
        is_active: bool = True
    ):
        """create tenant template from data"""
        template = MessageTemplateDoc(
            template_id=template_id,
            tenant_id=tenant_id,
            region=region,
            subject=subject,
            body=body,
            is_active=is_active,
            created_at=datetime.now(timezone.utc)
        )
        
        result = await self.template_message_service.create_tenant_template(tenant_id, template)
        
        action = "skipped" if hasattr(result, "_is_existing") and result._is_existing else "created"
        await self.module_logger.log_info(
            info=f"Tenant template {action}",
            properties={
                "tenant_id": tenant_id,
                "template_id": template_id,
                "region": region,
                "action": action
            }
        )
        
        return result

    async def update_tenant_template(self, tenant_id: str, template_id: str, data: dict, region: int):
        """update tenant template"""
        if not data.get("subject") and not data.get("body"):
            raise ValueError("At least subject or body must be provided")
        
        result = await self.template_message_service.update_tenant_template(tenant_id, template_id, data, region)
        
        await self.module_logger.log_info(
            info="Tenant template updated",
            properties={
                "tenant_id": tenant_id,
                "template_id": template_id,
                "region": region,
                "updated_fields": list(data.keys())
            }
        )
        
        return result
    async def delete_tenant_template(self, tenant_id: str, template_id: str, region: int):
        """delete tenant template"""
        result = await self.template_message_service.delete_tenant_template(tenant_id, template_id, region)
        
        await self.module_logger.log_info(
            info="Tenant template deleted",
            properties={
                "tenant_id": tenant_id,
                "template_id": template_id
            }
        )
        
        return result

    async def render_template(self, tenant_id: str, template_id: str, properties: dict, region: int):
        """render template"""
        result = await self.template_message_service.render_template(tenant_id, template_id, properties, region)
        
        await self.module_logger.log_info(
            info="Template rendered",
            properties={
                "tenant_id": tenant_id,
                "template_id": template_id,
                "properties_count": len(properties)
            }
        )
        
        return result