"""
Chatwoot API Client for B2B Shopping AI Assistant
"""
from typing import Any, Optional
from dataclasses import dataclass
from enum import Enum

import httpx

from config import settings
from utils.logger import get_logger

logger = get_logger(__name__)


class MessageType(str, Enum):
    """Chatwoot message types"""
    INCOMING = "incoming"
    OUTGOING = "outgoing"


class ConversationStatus(str, Enum):
    """Chatwoot conversation status"""
    OPEN = "open"
    RESOLVED = "resolved"
    PENDING = "pending"
    SNOOZED = "snoozed"


@dataclass
class ChatwootMessage:
    """Chatwoot message structure"""
    id: int
    content: str
    message_type: str
    conversation_id: int
    sender_type: Optional[str] = None
    sender_id: Optional[int] = None
    private: bool = False
    

@dataclass
class ChatwootContact:
    """Chatwoot contact structure"""
    id: int
    name: Optional[str] = None
    email: Optional[str] = None
    phone_number: Optional[str] = None
    custom_attributes: Optional[dict[str, Any]] = None


class ChatwootClient:
    """Chatwoot API Client"""
    
    def __init__(
        self,
        api_url: Optional[str] = None,
        api_token: Optional[str] = None,
        account_id: int = 2
    ):
        """Initialize Chatwoot client

        Args:
            api_url: Chatwoot API URL, defaults to settings
            api_token: API access token, defaults to settings
            account_id: Chatwoot account ID
        """
        self.api_url = (api_url or settings.chatwoot_api_url).rstrip("/")
        self.api_token = api_token or settings.chatwoot_api_token
        self.account_id = account_id
        self._client: Optional[httpx.AsyncClient] = None

        logger.info("Chatwoot client initialized", api_url=self.api_url)
    
    async def _get_client(self) -> httpx.AsyncClient:
        """Get or create HTTP client"""
        if self._client is None:
            self._client = httpx.AsyncClient(
                base_url=f"{self.api_url}/api/v1/accounts/{self.account_id}",
                headers={
                    "api_access_token": self.api_token,
                    "Content-Type": "application/json"
                },
                timeout=30.0
            )
        return self._client
    
    async def close(self) -> None:
        """Close HTTP client"""
        if self._client:
            await self._client.aclose()
            self._client = None
    
    # ============ Messages ============
    
    async def send_message(
        self,
        conversation_id: int,
        content: str,
        message_type: MessageType = MessageType.OUTGOING,
        private: bool = False
    ) -> dict[str, Any]:
        """Send a message to a conversation
        
        Args:
            conversation_id: Conversation ID
            content: Message content
            message_type: Message type (incoming/outgoing)
            private: Whether message is private (internal note)
            
        Returns:
            Created message data
        """
        client = await self._get_client()
        
        payload = {
            "content": content,
            "message_type": message_type.value,
            "private": private
        }
        
        response = await client.post(
            f"/conversations/{conversation_id}/messages",
            json=payload
        )
        response.raise_for_status()
        
        data = response.json()
        logger.debug(
            "Message sent",
            conversation_id=conversation_id,
            message_id=data.get("id")
        )
        return data
    
    async def send_rich_message(
        self,
        conversation_id: int,
        content: str,
        content_type: str,
        content_attributes: dict[str, Any]
    ) -> dict[str, Any]:
        """Send a rich message (cards, buttons, etc.)
        
        Args:
            conversation_id: Conversation ID
            content: Fallback text content
            content_type: Rich content type (cards, input_select, etc.)
            content_attributes: Rich content attributes
            
        Returns:
            Created message data
        """
        client = await self._get_client()
        
        payload = {
            "content": content,
            "message_type": MessageType.OUTGOING.value,
            "content_type": content_type,
            "content_attributes": content_attributes
        }
        
        response = await client.post(
            f"/conversations/{conversation_id}/messages",
            json=payload
        )
        response.raise_for_status()
        
        return response.json()
    
    # ============ Conversations ============
    
    async def get_conversation(self, conversation_id: int) -> dict[str, Any]:
        """Get conversation details
        
        Args:
            conversation_id: Conversation ID
            
        Returns:
            Conversation data
        """
        client = await self._get_client()
        
        response = await client.get(f"/conversations/{conversation_id}")
        response.raise_for_status()
        
        return response.json()
    
    async def update_conversation_status(
        self,
        conversation_id: int,
        status: ConversationStatus
    ) -> dict[str, Any]:
        """Update conversation status
        
        Args:
            conversation_id: Conversation ID
            status: New status
            
        Returns:
            Updated conversation data
        """
        client = await self._get_client()
        
        response = await client.post(
            f"/conversations/{conversation_id}/toggle_status",
            json={"status": status.value}
        )
        response.raise_for_status()
        
        logger.info(
            "Conversation status updated",
            conversation_id=conversation_id,
            status=status.value
        )
        return response.json()
    
    async def add_labels(
        self,
        conversation_id: int,
        labels: list[str]
    ) -> dict[str, Any]:
        """Add labels to a conversation
        
        Args:
            conversation_id: Conversation ID
            labels: List of label names
            
        Returns:
            Updated labels
        """
        client = await self._get_client()
        
        response = await client.post(
            f"/conversations/{conversation_id}/labels",
            json={"labels": labels}
        )
        response.raise_for_status()
        
        return response.json()
    
    async def assign_agent(
        self,
        conversation_id: int,
        agent_id: int
    ) -> dict[str, Any]:
        """Assign an agent to a conversation
        
        Args:
            conversation_id: Conversation ID
            agent_id: Agent user ID
            
        Returns:
            Assignment result
        """
        client = await self._get_client()
        
        response = await client.post(
            f"/conversations/{conversation_id}/assignments",
            json={"assignee_id": agent_id}
        )
        response.raise_for_status()
        
        logger.info(
            "Agent assigned",
            conversation_id=conversation_id,
            agent_id=agent_id
        )
        return response.json()
    
    # ============ Contacts ============
    
    async def get_contact(self, contact_id: int) -> dict[str, Any]:
        """Get contact details
        
        Args:
            contact_id: Contact ID
            
        Returns:
            Contact data
        """
        client = await self._get_client()
        
        response = await client.get(f"/contacts/{contact_id}")
        response.raise_for_status()
        
        return response.json()
    
    async def update_contact(
        self,
        contact_id: int,
        attributes: dict[str, Any]
    ) -> dict[str, Any]:
        """Update contact attributes
        
        Args:
            contact_id: Contact ID
            attributes: Attributes to update
            
        Returns:
            Updated contact data
        """
        client = await self._get_client()
        
        response = await client.put(
            f"/contacts/{contact_id}",
            json=attributes
        )
        response.raise_for_status()
        
        return response.json()
    
    # ============ Messages History ============
    
    async def get_messages(
        self,
        conversation_id: int,
        before: Optional[int] = None
    ) -> list[dict[str, Any]]:
        """Get conversation messages
        
        Args:
            conversation_id: Conversation ID
            before: Get messages before this message ID
            
        Returns:
            List of messages
        """
        client = await self._get_client()
        
        params = {}
        if before:
            params["before"] = before
        
        response = await client.get(
            f"/conversations/{conversation_id}/messages",
            params=params
        )
        response.raise_for_status()
        
        data = response.json()
        return data.get("payload", [])


# Global Chatwoot client instance
chatwoot_client: Optional[ChatwootClient] = None


def get_chatwoot_client() -> ChatwootClient:
    """Get or create global Chatwoot client instance"""
    global chatwoot_client
    if chatwoot_client is None:
        chatwoot_client = ChatwootClient()
    return chatwoot_client