import asyncio
import json
import logging
import uuid
from datetime import datetime, timezone

from ask_sdk_core.skill_builder import SkillBuilder
from ask_sdk_core.dispatch_components import (
    AbstractRequestHandler,
    AbstractExceptionHandler,
    AbstractRequestInterceptor,
)
from ask_sdk_core.utils import is_request_type, is_intent_name
from ask_sdk_model.ui import AskForPermissionsConsentCard

try:
    from ask_sdk_model.canfulfill import CanFulfillIntent, CanFulfillIntentValues
    _CANFULFILL_AVAILABLE = True
except ImportError:
    _CANFULFILL_AVAILABLE = False

from yuxi.channel.extensions.alexa.format import MarkdownToSSML, ssml_safe
from yuxi.channel.extensions.alexa.session import AlexaSessionManager
from yuxi.channel.extensions.alexa.security import AlexaSecurity
from yuxi.channel.extensions.alexa.outbound import SSMLResponseBuilder
from yuxi.channel.extensions.alexa.progressive import ProgressiveResponseService
from yuxi.channel.message.models import MessageType, PeerInfo, UnifiedMessage
from yuxi.channel.routing.models import PeerKind

logger = logging.getLogger(__name__)

_agent_response_cache: dict[str, str] = {}

RESPONSE_TEXTS = {
    "zh-CN": {
        "welcome": "欢迎使用 ForcePilot 智能助手。您可以向我提问任何知识库相关的问题，例如：'公司请假流程是什么'。请问有什么可以帮您？",
        "help": "欢迎使用 ForcePilot 智能助手。您可以向我提问任何知识库相关的问题，例如：'公司请假流程是什么'。请问有什么可以帮您？",
        "ask_prompt": "请说出您的问题。",
        "goodbye": "好的，再见。",
        "auth_failed": "账号验证失败，请重新在 Alexa App 中关联您的账号。",
        "account_link_required": "请先在 Alexa App 中关联您的 ForcePilot 账号。",
        "service_unavailable": "抱歉，服务暂时不可用，请稍后再试。",
        "no_result": "抱歉，我没有找到相关信息。",
        "timeout": "抱歉，回答这个问题需要较长时间，请您换个方式问我。",
        "error": "抱歉，我遇到了一些问题，请稍后再试。",
    },
    "en-US": {
        "welcome": "Welcome to ForcePilot Knowledge Assistant. You can ask me anything about your knowledge base. For example: What are the company leave policies? How can I help you?",
        "help": "Welcome to ForcePilot Knowledge Assistant. You can ask me anything about your knowledge base. For example: What are the company leave policies? How can I help you?",
        "ask_prompt": "Please tell me your question.",
        "goodbye": "Goodbye!",
        "auth_failed": "Account verification failed. Please re-link your account in the Alexa App.",
        "account_link_required": "Please link your ForcePilot account in the Alexa App first.",
        "service_unavailable": "Sorry, the service is temporarily unavailable. Please try again later.",
        "no_result": "Sorry, I couldn't find any relevant information.",
        "timeout": "Sorry, answering this question takes longer than expected. Please try rephrasing your question.",
        "error": "Sorry, I encountered an issue. Please try again later.",
    },
}


def _t(locale: str, key: str) -> str:
    texts = RESPONSE_TEXTS.get(locale, RESPONSE_TEXTS["en-US"])
    return texts.get(key, RESPONSE_TEXTS["en-US"].get(key, key))


def _get_locale(handler_input) -> str:
    try:
        locale = handler_input.request_envelope.request.locale
        return locale if locale in RESPONSE_TEXTS else "en-US"
    except Exception:
        return "en-US"


def set_cached_agent_response(request_id: str, response_text: str):
    _agent_response_cache[request_id] = response_text


def _pop_cached_agent_response(request_id: str) -> str | None:
    return _agent_response_cache.pop(request_id, None)


class SkillIdInterceptor(AbstractRequestInterceptor):

    def process(self, handler_input):
        expected_skill_id = _get_expected_skill_id()
        if not expected_skill_id:
            return
        try:
            actual_skill_id = handler_input.request_envelope.context.system.application.application_id
            if actual_skill_id != expected_skill_id:
                logger.warning(
                    "Skill ID mismatch: expected=%s, actual=%s",
                    expected_skill_id,
                    actual_skill_id,
                )
                raise ValueError("Invalid Skill ID")
        except ValueError:
            raise
        except Exception:
            logger.exception("Skill ID verification failed")


_expected_skill_id: str | None = None


def _get_expected_skill_id() -> str | None:
    return _expected_skill_id


def set_expected_skill_id(skill_id: str | None):
    global _expected_skill_id
    _expected_skill_id = skill_id


_sb = SkillBuilder()
_sb.add_global_request_interceptor(SkillIdInterceptor())


class ChatIntentHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        return (
            is_intent_name("ChatIntent")(handler_input)
            or is_intent_name("AMAZON.FallbackIntent")(handler_input)
        )

    def handle(self, handler_input):
        envelope = handler_input.request_envelope
        system = envelope.context.system
        session = envelope.session

        access_token = system.user.access_token
        user_id = system.user.user_id
        session_id = session.session_id if session else ""
        is_new = session.new if session else True

        request_obj = envelope.request
        slots = getattr(request_obj, "intent", None)
        query_text = "你好"
        if slots and hasattr(slots, "slots") and slots.slots and "query" in slots.slots:
            slot_value = slots.slots["query"]
            if slot_value and slot_value.value:
                query_text = slot_value.value

        request_id = getattr(request_obj, "request_id", str(uuid.uuid4()))
        locale_str = _get_locale(handler_input)

        _plugin = _get_plugin()
        security = _plugin._security if _plugin else None

        if access_token and security:
            verified = security.verify_access_token(access_token)
            if not verified.get("verified"):
                return handler_input.response_builder.speak(
                    _t(locale_str, "auth_failed")
                ).set_should_end_session(True).response
        elif security and security.account_linking_enabled:
            return handler_input.response_builder.speak(
                _t(locale_str, "account_link_required")
            ).set_card(
                AskForPermissionsConsentCard(permissions=[])
            ).set_should_end_session(True).response

        agent_response = _pop_cached_agent_response(request_id)
        if agent_response is None:
            agent_response = _t(locale_str, "service_unavailable")

        formatter = _plugin._formatter if _plugin else MarkdownToSSML()
        ssml = formatter.convert(agent_response)

        session_attrs = session.attributes if session and session.attributes else {}
        if is_new:
            session_attrs = {}
        session_attrs["_last_query"] = query_text
        session_attrs["_turn"] = session_attrs.get("_turn", 0) + 1

        handler_input.response_builder.speak(ssml)
        handler_input.response_builder.set_should_end_session(False)

        response = handler_input.response_builder.response

        if SSMLResponseBuilder.supports_apl(handler_input):
            title = query_text[:50] + ("…" if len(query_text) > 50 else "")
            apl_directive = SSMLResponseBuilder.build_apl_directive(title, agent_response)
            try:
                if response.directives is None:
                    response.directives = []
                response.directives.append(apl_directive)
            except (TypeError, AttributeError):
                pass

        return response


class LaunchRequestHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        return is_request_type("LaunchRequest")(handler_input)

    def handle(self, handler_input):
        locale_str = _get_locale(handler_input)
        speech = _t(locale_str, "welcome")
        handler_input.response_builder.speak(speech).ask(_t(locale_str, "ask_prompt"))
        return handler_input.response_builder.response


class HelpIntentHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        return is_intent_name("AMAZON.HelpIntent")(handler_input)

    def handle(self, handler_input):
        locale_str = _get_locale(handler_input)
        speech = _t(locale_str, "help")
        handler_input.response_builder.speak(speech).ask(_t(locale_str, "ask_prompt"))
        return handler_input.response_builder.response


class StopCancelHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        return (
            is_intent_name("AMAZON.StopIntent")(handler_input)
            or is_intent_name("AMAZON.CancelIntent")(handler_input)
        )

    def handle(self, handler_input):
        locale_str = _get_locale(handler_input)
        handler_input.response_builder.speak(_t(locale_str, "goodbye")).set_should_end_session(True)
        return handler_input.response_builder.response


class SessionEndedHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        return is_request_type("SessionEndedRequest")(handler_input)

    def handle(self, handler_input):
        session = handler_input.request_envelope.session
        if session:
            reason = getattr(
                getattr(handler_input.request_envelope.request, "reason", None),
                "value",
                "unknown",
            )
            logger.info(
                "Alexa session ended: session_id=%s, reason=%s",
                getattr(session, "session_id", ""),
                reason,
            )
        return handler_input.response_builder.response


class CanFulfillIntentHandler(AbstractRequestHandler):

    def can_handle(self, handler_input):
        if not _CANFULFILL_AVAILABLE:
            return False
        return is_request_type("CanFulfillIntentRequest")(handler_input)

    def handle(self, handler_input):
        intent_name = handler_input.request_envelope.request.intent.name
        can_fulfill = CanFulfillIntentValues.YES if intent_name == "ChatIntent" else CanFulfillIntentValues.NO
        return (
            handler_input.response_builder
            .set_can_fulfill_intent(CanFulfillIntent(can_fulfill=can_fulfill))
            .response
        )


class CatchAllExceptionHandler(AbstractExceptionHandler):

    def can_handle(self, handler_input, exception):
        return True

    def handle(self, handler_input, exception):
        logger.exception("Unhandled Alexa skill exception")
        locale_str = _get_locale(handler_input)
        return handler_input.response_builder.speak(
            _t(locale_str, "error")
        ).set_should_end_session(True).response


_sb.add_request_handler(CanFulfillIntentHandler())
_sb.add_request_handler(LaunchRequestHandler())
_sb.add_request_handler(ChatIntentHandler())
_sb.add_request_handler(HelpIntentHandler())
_sb.add_request_handler(StopCancelHandler())
_sb.add_request_handler(SessionEndedHandler())
_sb.add_exception_handler(CatchAllExceptionHandler())


_plugin_ref = None


def set_plugin_ref(plugin):
    global _plugin_ref
    _plugin_ref = plugin


def _get_plugin():
    return _plugin_ref


def create_skill_handler():
    return _sb.create()


def extract_query_from_envelope(envelope: dict) -> dict:
    request_obj = envelope.get("request", {})
    request_type = request_obj.get("type", "")
    request_id = request_obj.get("requestId", str(uuid.uuid4()))
    locale = request_obj.get("locale", "en-US")

    session = envelope.get("session", {})
    session_id = session.get("sessionId", "")
    is_new = session.get("new", True)

    context = envelope.get("context", {})
    system = context.get("System", context.get("system", {}))
    user = system.get("user", {})
    user_id = user.get("userId", "")
    access_token = user.get("accessToken", None)
    device = system.get("device", {})
    device_id = device.get("deviceId", "")

    query_text = "你好"
    intent_name = request_type

    if request_type == "IntentRequest":
        intent = request_obj.get("intent", {})
        intent_name = intent.get("name", request_type)
        slots = intent.get("slots", {})
        if "query" in slots:
            slot_value = slots["query"]
            if isinstance(slot_value, dict):
                query_text = slot_value.get("value", "你好")
            elif hasattr(slot_value, "value"):
                query_text = slot_value.value

    return {
        "request_id": request_id,
        "session_id": session_id,
        "user_id": user_id,
        "access_token": access_token,
        "intent_name": intent_name,
        "query_text": query_text,
        "locale": locale,
        "is_new_session": is_new,
        "device_id": device_id,
    }


async def dispatch_to_agent(query_info: dict) -> str:
    from yuxi.channel.runtime.manager import gateway

    processor = gateway._processor
    if processor is None:
        return "抱歉，服务暂时不可用。"

    unified_msg = UnifiedMessage(
        msg_id=query_info["request_id"],
        channel_type="alexa",
        account_id="default",
        content=query_info["query_text"],
        message_type=MessageType.TEXT,
        sender=PeerInfo(
            id=query_info["user_id"],
            kind=PeerKind.DIRECT,
            display_name=query_info["user_id"][:16],
        ),
        timestamp=datetime.now(timezone.utc),
        body_for_agent=query_info["query_text"],
        metadata={
            "session_id": query_info["session_id"],
            "device_id": query_info["device_id"],
            "locale": query_info["locale"],
            "is_new_session": query_info["is_new_session"],
            "intent_name": query_info["intent_name"],
        },
    )

    try:
        result = await asyncio.wait_for(processor.process(unified_msg), timeout=7.0)
        if result is None:
            return "抱歉，我没有找到相关信息。"
        if isinstance(result, str):
            return result
        if isinstance(result, dict):
            return result.get("content", result.get("text", str(result)))
        return str(result)
    except asyncio.TimeoutError:
        return "抱歉，回答这个问题需要较长时间，请您换个方式问我。"
    except Exception:
        logger.exception("Agent dispatch failed for Alexa")
        return "抱歉，我遇到了一些问题，请稍后再试。"