import os
import logging

logger = logging.getLogger(__name__)


class WhatsAppConfigAdapter:

    def list_account_ids(self, config: dict) -> list[str]:
        accounts = config.get("accounts", {})
        if not accounts:
            return ["default"] if self._env_token_exists("default") else []
        return list(accounts.keys())

    async def resolve_account(self, account_id: str) -> dict:
        raw = self._load_config(account_id)
        return self._build_account(account_id, raw)

    def is_configured(self, account: dict) -> bool:
        return bool(account.get("phone_number_id") and account.get("access_token"))

    def is_enabled(self, account: dict) -> bool:
        return account.get("enabled", True)

    def describe_account(self, account: dict) -> dict:
        return {
            "account_id": account.get("account_id", ""),
            "phone_number_id": account.get("phone_number_id", ""),
            "display_phone_number": account.get("display_phone_number", ""),
            "dm_policy": account.get("dm_policy", "pairing"),
            "configured": self.is_configured(account),
        }

    def default_account_id(self, config: dict) -> str:
        return config.get("default_account", "default")

    def resolve_allow_from(self, config: dict, account_id: str | None = None) -> list[str]:
        aid = account_id or self.default_account_id(config)
        accounts = config.get("accounts", {})
        account = accounts.get(aid, {})
        return account.get("allow_from", [])

    def config_schema(self) -> dict:
        return {
            "$schema": "https://json-schema.org/draft-07/schema#",
            "type": "object",
            "title": "WhatsApp 渠道配置",
            "properties": {
                "phone_number_id": {
                    "type": "string",
                    "title": "电话号码 ID",
                    "description": "WhatsApp Business 电话号码 ID（从 Meta Business Suite 获取）",
                },
                "business_account_id": {
                    "type": "string",
                    "title": "Business Account ID",
                    "description": "WhatsApp Business Account ID",
                },
                "access_token": {
                    "type": "string",
                    "title": "Access Token",
                    "description": "Meta Permanent Access Token（也可通过环境变量 WHATSAPP_ACCESS_TOKEN 注入）",
                    "x-ui-password": True,
                },
                "app_secret": {
                    "type": "string",
                    "title": "App Secret",
                    "description": "Webhook 签名验证密钥（也可通过环境变量 WHATSAPP_APP_SECRET 注入）",
                    "x-ui-password": True,
                },
                "verify_token": {
                    "type": "string",
                    "title": "Webhook 验证 Token",
                    "description": "Meta Webhook 配置时的自定义验证 Token",
                },
                "display_phone_number": {
                    "type": "string",
                    "title": "展示号码",
                    "description": "用于前端展示的电话号码",
                },
                "dm_policy": {
                    "type": "string",
                    "title": "DM 策略",
                    "enum": ["pairing", "allowlist", "open", "disabled"],
                    "default": "pairing",
                },
                "group_policy": {
                    "type": "string",
                    "title": "群组策略",
                    "enum": ["open", "disabled", "allowlist"],
                    "default": "open",
                },
                "text_chunk_limit": {
                    "type": "integer",
                    "title": "文本分块上限",
                    "default": 2000,
                    "minimum": 100,
                    "maximum": 4096,
                },
                "media_max_mb": {
                    "type": "integer",
                    "title": "媒体大小上限 (MB)",
                    "default": 50,
                    "minimum": 1,
                    "maximum": 100,
                },
            },
            "required": ["phone_number_id", "access_token", "app_secret"],
        }

    def _load_config(self, account_id: str) -> dict:
        return {}

    def _build_account(self, account_id: str, raw: dict) -> dict:
        env_token = self._env_access_token(account_id)
        env_secret = os.environ.get("WHATSAPP_APP_SECRET", "")
        env_verify = os.environ.get("WHATSAPP_VERIFY_TOKEN", "")

        return {
            "account_id": account_id,
            "phone_number_id": raw.get("phone_number_id", os.environ.get("WHATSAPP_PHONE_NUMBER_ID", "")),
            "business_account_id": raw.get("business_account_id", os.environ.get("WHATSAPP_BUSINESS_ACCOUNT_ID", "")),
            "access_token": env_token or raw.get("access_token", ""),
            "app_secret": env_secret or raw.get("app_secret", ""),
            "verify_token": env_verify or raw.get("verify_token", ""),
            "display_phone_number": raw.get("display_phone_number", ""),
            "name": raw.get("name", account_id),
            "enabled": raw.get("enabled", True),
            "dm_policy": raw.get("dm_policy", "pairing"),
            "group_policy": raw.get("group_policy", "open"),
            "allow_from": raw.get("allow_from", []),
            "text_chunk_limit": raw.get("text_chunk_limit", 2000),
            "media_max_mb": raw.get("media_max_mb", 50),
            "reaction_level": raw.get("reaction_level", "minimal"),
        }

    @staticmethod
    def _env_access_token(account_id: str) -> str:
        key = f"WHATSAPP_ACCESS_TOKEN_{account_id.upper()}"
        return os.environ.get(key, "") or os.environ.get("WHATSAPP_ACCESS_TOKEN", "")

    @staticmethod
    def _env_token_exists(account_id: str) -> bool:
        return bool(WhatsAppConfigAdapter._env_access_token(account_id))