from __future__ import annotations

import logging
import os

logger = logging.getLogger(__name__)


class RocketChatConfigAdapter:
    def __init__(self):
        self._config: dict = {}

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

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

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

    def _load_config(self, account_id: str) -> dict:
        accounts = self._config.get("accounts", {})
        return accounts.get(account_id, {})

    def _build_account(self, account_id: str, raw: dict) -> dict:
        env_token = os.environ.get("ROCKETCHAT_AUTH_TOKEN", "")
        env_user_id = os.environ.get("ROCKETCHAT_USER_ID", "")
        env_url = os.environ.get("ROCKETCHAT_URL", "")

        account = {
            "account_id": account_id,
            "name": raw.get("name", account_id),
            "enabled": raw.get("enabled", True),
            "auth_token": env_token or raw.get("auth_token", ""),
            "user_id": env_user_id or raw.get("user_id", ""),
            "server_url": env_url or raw.get("server_url", ""),
            "webhook_secret": raw.get("webhook_secret", ""),
            "chatmode": raw.get("chatmode", "oncall"),
            "onchar_prefixes": raw.get("onchar_prefixes", [">", "!"]),
            "require_mention": raw.get("require_mention", True),
            "dm_policy": raw.get("dm_policy", "pairing"),
            "allow_from": raw.get("allow_from", []),
            "group_policy": raw.get("group_policy", "allowlist"),
            "group_allow_from": raw.get("group_allow_from", []),
            "channel_policy": raw.get("channel_policy", "allowlist"),
            "channel_allow_from": raw.get("channel_allow_from", []),
            "text_chunk_limit": raw.get("text_chunk_limit", 4000),
            "reply_to_mode": raw.get("reply_to_mode", "off"),
            "block_streaming": raw.get("block_streaming", True),
            "block_streaming_coalesce": raw.get(
                "block_streaming_coalesce",
                {"min_chars": 1500, "idle_ms": 1000},
            ),
        }

        coalesce = account["block_streaming_coalesce"]
        account["block_streaming_coalesce_min_chars"] = coalesce.get("min_chars", 1500)
        account["block_streaming_coalesce_idle_ms"] = coalesce.get("idle_ms", 1000)

        return account

    def is_configured(self, account: dict) -> bool:
        return bool(account.get("auth_token") and account.get("user_id") and account.get("server_url"))

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

    def disabled_reason(self, account: dict) -> str:
        if not account.get("enabled", True):
            return "Account disabled"
        return ""

    def describe_account(self, account: dict) -> dict:
        return {
            "account_id": account.get("account_id", ""),
            "name": account.get("name", ""),
            "server_url": account.get("server_url", ""),
            "dm_policy": account.get("dm_policy", "pairing"),
            "configured": self.is_configured(account),
            "enabled": self.is_enabled(account),
        }

    def resolve_allow_from(self, config: dict, account_id: str | None = None) -> list[str] | None:
        self._config = config
        aid = account_id or "default"
        accounts = config.get("accounts", {})
        acct = accounts.get(aid, {}) if accounts else {}
        allow = acct.get("allow_from", config.get("allow_from", []))
        if not allow:
            return None
        return [str(e).strip() for e in allow]

    def config_schema(self) -> dict:
        return {
            "$schema": "https://json-schema.org/draft-07/schema#",
            "type": "object",
            "title": "Rocket.Chat 渠道配置",
            "properties": {
                "server_url": {
                    "type": "string",
                    "title": "Server URL",
                    "description": "Rocket.Chat 服务器 URL (如 https://chat.example.com)",
                },
                "auth_token": {
                    "type": "string",
                    "title": "Auth Token",
                    "description": "Personal Access Token (X-Auth-Token)",
                    "x-ui-password": True,
                },
                "user_id": {
                    "type": "string",
                    "title": "User ID",
                    "description": "Bot 用户 ID (X-User-Id)",
                },
                "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", "allowlist", "disabled"],
                    "default": "allowlist",
                },
                "channel_policy": {
                    "type": "string",
                    "title": "公开频道策略",
                    "enum": ["open", "allowlist", "disabled"],
                    "default": "allowlist",
                },
                "chatmode": {
                    "type": "string",
                    "title": "聊天模式",
                    "enum": ["oncall", "onmessage", "onchar"],
                    "default": "oncall",
                },
                "require_mention": {
                    "type": "boolean",
                    "title": "需要 @提及",
                    "default": True,
                },
                "text_chunk_limit": {
                    "type": "integer",
                    "title": "文本分块上限",
                    "default": 4000,
                },
                "block_streaming": {
                    "type": "boolean",
                    "title": "启用块流式",
                    "default": True,
                },
                "webhook_secret": {
                    "type": "string",
                    "title": "Webhook Secret",
                    "description": "Incoming Webhook 签名验证密钥",
                    "x-ui-password": True,
                },
            },
        }

    def _env_token_exists(self) -> bool:
        return bool(os.environ.get("ROCKETCHAT_AUTH_TOKEN") and os.environ.get("ROCKETCHAT_USER_ID"))


def normalize_rocketchat_server_url(url: str) -> str:
    url = url.rstrip("/")
    if url.endswith("/api/v1"):
        url = url[:-7]
    return url


def validate_rocketchat_config(account: dict) -> list[str]:
    errors: list[str] = []

    dm_policy = account.get("dm_policy", "pairing")
    if dm_policy == "open":
        allow_from = account.get("allow_from", [])
        if "*" not in [str(e).strip() for e in allow_from]:
            errors.append("dm_policy='open' requires allow_from to include '*' (open to all senders)")

    return errors