"""
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()

    async def send_order_card(
        self,
        conversation_id: int,
        order_data: dict[str, Any],
        actions: list[dict[str, Any]]
    ) -> dict[str, Any]:
        """发送订单卡片消息（Markdown 文本 + 操作按钮）

        Args:
            conversation_id: 会话 ID
            order_data: 订单数据，包含：
                - order_id: 订单号
                - status: 订单状态
                - status_text: 状态文本
                - created_at: 下单时间（可选）
                - items: 商品列表（可选）
                - total_amount: 总金额
                - shipping_fee: 运费（可选）
                - logistics: 物流信息（可选）
                - remark: 备注（可选）
            actions: 操作按钮配置列表，每个按钮包含：
                - type: "link" 或 "postback"
                - text: 按钮文字
                - uri: 链接地址（type=link 时必需）
                - payload: 回传数据（type=postback 时必需）

        Returns:
            发送结果

        Example:
            >>> order_data = {
            ...     "order_id": "123456789",
            ...     "status": "shipped",
            ...     "status_text": "已发货",
            ...     "total_amount": "1058.00",
            ...     "items": [...]
            ... }
            >>> actions = [
            ...     {"type": "link", "text": "查看详情", "uri": "https://..."},
            ...     {"type": "postback", "text": "联系客服", "payload": "CONTACT_SUPPORT"}
            ... ]
            >>> await chatwoot.send_order_card(123, order_data, actions)
        """
        # 生成 Markdown 内容
        markdown_content = format_order_card_markdown(order_data)

        # 生成按钮卡片
        buttons = create_action_buttons(actions)

        # 发送富媒体消息
        return await self.send_rich_message(
            conversation_id=conversation_id,
            content=markdown_content,
            content_type="cards",
            content_attributes=buttons
        )
    
    # ============ 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", [])


# ============ Helper Functions ============

def format_order_card_markdown(order_data: dict[str, Any]) -> str:
    """格式化订单信息为 Markdown 卡片

    Args:
        order_data: 订单数据，包含订单号、状态、商品、金额、物流等信息

    Returns:
        格式化的 Markdown 字符串

    Example:
        >>> order = {
        ...     "order_id": "123456789",
        ...     "status": "shipped",
        ...     "status_text": "已发货",
        ...     "created_at": "2023-10-27 14:30",
        ...     "items": [...],
        ...     "total_amount": "1058.00",
        ...     "shipping_fee": "0.00",
        ...     "logistics": {...}
        ... }
        >>> markdown = format_order_card_markdown(order)
    """
    # 订单状态 emoji 映射
    status_emoji = {
        "pending": "⏳",
        "paid": "💰",
        "processing": "⚙️",
        "shipped": "📦",
        "delivered": "✅",
        "completed": "✅",
        "cancelled": "❌",
        "refunded": "💸",
        "failed": "⚠️",
    }

    # 获取状态文本和 emoji
    status = order_data.get("status", "unknown")
    status_text = order_data.get("status_text", status)
    emoji = status_emoji.get(status, "📦")

    lines = [
        f"{emoji} **订单状态：{status_text}**",
        f"📝 **订单号：** `{order_data.get('order_id', '')}`",
    ]

    # 添加下单时间（如果有）
    if order_data.get("created_at"):
        lines.append(f"📅 **下单时间：** {order_data['created_at']}")

    lines.append("")  # 空行
    lines.append("**商品详情**")

    # 添加商品列表
    items = order_data.get("items", [])
    if items:
        for item in items:
            name = item.get("name", "未知商品")
            quantity = item.get("quantity", 1)
            price = item.get("price", "0.00")
            # 可选：添加图片链接
            image_markdown = ""
            if item.get("image_url"):
                image_markdown = f" [图片]({item['image_url']})"
            lines.append(f"▫️{image_markdown} {name} × {quantity}  ¥{price}")
    else:
        lines.append("▫️ 无商品信息")

    # 添加金额信息
    lines.extend([
        "",
        f"💰 **实付：** ¥{order_data.get('total_amount', '0.00')} (含运费 ¥{order_data.get('shipping_fee', '0.00')})"
    ])

    # 添加物流信息（如果有）
    logistics = order_data.get("logistics")
    if logistics:
        lines.extend([
            "",
            "🚚 **物流信息**",
            f"承运商：{logistics.get('carrier', '未知')}",
            f"单号：{logistics.get('tracking_number', '未知')}",
            "*点击单号可复制跟踪*"
        ])

    # 添加备注（如果有）
    if order_data.get("remark"):
        lines.extend([
            "",
            f"📋 **备注：** {order_data['remark']}"
        ])

    return "\n".join(lines)


def create_action_buttons(actions: list[dict[str, Any]]) -> dict[str, Any]:
    """创建 Chatwoot 操作按钮卡片

    Args:
        actions: 按钮配置列表，每个按钮包含：
            - type: "link" 或 "postback"
            - text: 按钮文字
            - uri: 链接地址（type=link 时）
            - payload: 回传数据（type=postback 时）

    Returns:
        符合 Chatwoot content_attributes 格式的字典

    Example:
        >>> actions = [
        ...     {"type": "link", "text": "查看详情", "uri": "https://example.com"},
        ...     {"type": "postback", "text": "联系客服", "payload": "CONTACT_SUPPORT"}
        ... ]
        >>> buttons = create_action_buttons(actions)
    """
    return {
        "items": [{
            "title": "操作",
            "actions": actions
        }]
    }


# 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