import os
import logging

logger = logging.getLogger(__name__)

ENV_PREFIX = "MESSENGER"


class MessengerConfigAdapter:
    def list_account_ids(self, config: dict | None = None) -> list[str]:
        ids = []
        if config and "accounts" in config:
            ids.extend(config["accounts"].keys())
        page_id = os.environ.get(f"{ENV_PREFIX}_PAGE_ID")
        if page_id:
            ids.append("default")
        return list(dict.fromkeys(ids)) or ["default"]

    def resolve_account(self, account_id: str = "default", config: dict | None = None) -> dict:
        raw = {}
        if config and "accounts" in config:
            raw = config["accounts"].get(account_id, {})
        return self._build_account(account_id, raw)

    def _build_account(self, account_id: str, raw: dict) -> dict:
        suffix = f"_{account_id.upper()}" if account_id != "default" else ""
        return {
            "account_id": account_id,
            "page_id": raw.get("page_id", os.environ.get(f"{ENV_PREFIX}_PAGE_ID{suffix}", "")),
            "page_access_token": raw.get(
                "page_access_token", os.environ.get(f"{ENV_PREFIX}_PAGE_ACCESS_TOKEN{suffix}", "")
            ),
            "app_secret": raw.get("app_secret", os.environ.get(f"{ENV_PREFIX}_APP_SECRET{suffix}", "")),
            "verify_token": raw.get("verify_token", os.environ.get(f"{ENV_PREFIX}_VERIFY_TOKEN{suffix}", "")),
            "dm_policy": raw.get("dm_policy", os.environ.get(f"{ENV_PREFIX}_DM_POLICY{suffix}", "pairing")),
            "allow_from": raw.get("allow_from", []),
            "persona_id": raw.get("persona_id"),
            "default_messaging_type": raw.get(
                "default_messaging_type",
                os.environ.get(f"{ENV_PREFIX}_DEFAULT_MESSAGING_TYPE{suffix}", "RESPONSE"),
            ),
            "notification_type": raw.get(
                "notification_type",
                os.environ.get(f"{ENV_PREFIX}_NOTIFICATION_TYPE{suffix}", "REGULAR"),
            ),
            "text_chunk_limit": raw.get("text_chunk_limit", 2000),
            "chunk_mode": raw.get("chunk_mode", "length"),
        }

    @staticmethod
    def is_configured(account: dict) -> bool:
        return bool(account.get("page_id") and account.get("page_access_token"))

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

    @staticmethod
    def disabled_reason(account: dict) -> str:
        if not account.get("page_id"):
            return "缺少 Page ID"
        if not account.get("page_access_token"):
            return "缺少 Page Access Token"
        return ""

    @staticmethod
    def default_account_id(config: dict | None = None) -> str:
        if config and "accounts" in config:
            return next(iter(config["accounts"]), "default")
        return "default"

    @staticmethod
    def config_schema() -> dict:
        return {
            "$schema": "https://json-schema.org/draft-07/schema#",
            "type": "object",
            "title": "Facebook Messenger 渠道配置",
            "properties": {
                "accounts": {
                    "type": "object",
                    "title": "账户列表",
                    "description": "多账户配置，key 为账户 ID",
                    "additionalProperties": {
                        "type": "object",
                        "title": "账户配置",
                        "properties": {
                            "page_id": {
                                "type": "string",
                                "title": "Page ID",
                                "description": "Facebook Page 的数字 ID",
                            },
                            "page_access_token": {
                                "type": "string",
                                "title": "Page Access Token",
                                "description": "Facebook Page 的访问令牌",
                                "x-ui-password": True,
                            },
                            "app_secret": {
                                "type": "string",
                                "title": "App Secret",
                                "description": "Meta App Secret，用于 Webhook 签名验证",
                                "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",
                            },
                            "dm_policy": {
                                "type": "string",
                                "title": "DM 策略",
                                "enum": ["pairing", "allowlist", "open", "disabled"],
                                "default": "pairing",
                            },
                            "allow_from": {
                                "type": "array",
                                "title": "白名单用户 PSID 列表",
                                "items": {"type": "string"},
                                "default": [],
                            },
                            "persona_id": {
                                "type": "string",
                                "title": "Persona ID",
                                "description": "Messenger Persona 虚拟形象 ID",
                            },
                            "default_messaging_type": {
                                "type": "string",
                                "title": "消息类型",
                                "enum": ["RESPONSE", "UPDATE", "MESSAGE_TAG"],
                                "default": "RESPONSE",
                            },
                            "notification_type": {
                                "type": "string",
                                "title": "通知类型",
                                "enum": ["REGULAR", "SILENT_PUSH", "NO_PUSH"],
                                "default": "REGULAR",
                            },
                            "enabled": {
                                "type": "boolean",
                                "title": "启用",
                                "default": True,
                            },
                        },
                        "required": ["page_id", "page_access_token"],
                    },
                },
                "default_account": {
                    "type": "string",
                    "title": "默认账户",
                    "description": "默认使用的账户 ID",
                    "default": "default",
                },
            },
        }