# -*- coding: utf-8 -*-
"""
===================================
Discord 平台适配器
===================================

负责：
1. 验证 Discord Webhook 请求
2. 解析 Discord 消息为统一格式
3. 将响应转换为 Discord 格式
"""

import logging
from typing import Dict, Any, Optional

from bot.platforms.base import BotPlatform
from bot.models import BotMessage, WebhookResponse


logger = logging.getLogger(__name__)


class DiscordPlatform(BotPlatform):
    """Discord 平台适配器"""
    
    @property
    def platform_name(self) -> str:
        """平台标识名称"""
        return "discord"
    
    def verify_request(self, headers: Dict[str, str], body: bytes) -> bool:
        """验证 Discord Webhook 请求签名
        
        Discord Webhook 签名验证：
        1. 从请求头获取 X-Signature-Ed25519 和 X-Signature-Timestamp
        2. 使用公钥验证签名
        
        Args:
            headers: HTTP 请求头
            body: 请求体原始字节
            
        Returns:
            签名是否有效
        """
        # TODO: 实现 Discord Webhook 签名验证
        # 当前暂时返回 True，后续需要完善
        return True
    
    def parse_message(self, data: Dict[str, Any]) -> Optional[BotMessage]:
        """解析 Discord 消息为统一格式
        
        Args:
            data: 解析后的 JSON 数据
            
        Returns:
            BotMessage 对象，或 None（不需要处理）
        """
        # 检查是否是消息事件
        if data.get("type") != 1 and data.get("type") != 2:
            return None
        
        # 提取消息内容
        content = data.get("content", "").strip()
        if not content:
            return None
        
        # 提取用户信息
        author = data.get("author", {})
        user_id = author.get("id", "")
        user_name = author.get("username", "unknown")
        
        # 提取频道信息
        channel_id = data.get("channel_id", "")
        guild_id = data.get("guild_id", "")
        
        # 提取消息 ID
        message_id = data.get("id", "")
        
        # 提取附件信息（如果有）
        attachments = data.get("attachments", [])
        attachment_urls = [att["url"] for att in attachments if "url" in att]
        
        # 构建 BotMessage 对象
        message = BotMessage(
            platform="discord",
            message_id=message_id,
            user_id=user_id,
            user_name=user_name,
            content=content,
            attachment_urls=attachment_urls,
            channel_id=channel_id,
            group_id=guild_id,
            # 从 data 中提取其他相关信息
            timestamp=data.get("timestamp"),
            mention_everyone=data.get("mention_everyone", False),
            mentions=data.get("mentions", []),
            
            # 添加 Discord 特定的原始数据
            raw_data={
                "message_id": message_id,
                "channel_id": channel_id,
                "guild_id": guild_id,
                "author": author,
                "content": content,
                "timestamp": data.get("timestamp"),
                "attachments": attachments,
                "mentions": data.get("mentions", []),
                "mention_roles": data.get("mention_roles", []),
                "mention_everyone": data.get("mention_everyone", False),
                "type": data.get("type"),
            }
        )
        
        return message
    
    def format_response(self, response: Any, message: BotMessage) -> WebhookResponse:
        """将统一响应转换为 Discord 格式
        
        Args:
            response: 统一响应对象
            message: 原始消息对象
            
        Returns:
            WebhookResponse 对象
        """
        # 构建 Discord 响应格式
        discord_response = {
            "content": response.text if hasattr(response, "text") else str(response),
            "tts": False,
            "embeds": [],
            "allowed_mentions": {
                "parse": ["users", "roles", "everyone"]
            }
        }
        
        return WebhookResponse.success(discord_response)
    
    def handle_challenge(self, data: Dict[str, Any]) -> Optional[WebhookResponse]:
        """处理 Discord 验证请求
        
        Discord 在配置 Webhook 时会发送验证请求
        
        Args:
            data: 请求数据
            
        Returns:
            验证响应，或 None（不是验证请求）
        """
        # Discord Webhook 验证请求类型是 1
        if data.get("type") == 1:
            return WebhookResponse.success({
                "type": 1
            })
        
        # Discord 命令交互验证
        if "challenge" in data:
            return WebhookResponse.success({
                "challenge": data["challenge"]
            })
        
        return None