import time
import asyncio

import web

from channel.wechatmp.wechatmp_message import WeChatMPMessage
from bridge.context import *
from bridge.reply import *
from channel.wechatmp.common import *
from channel.wechatmp.wechatmp_channel import WechatMPChannel
from common.log import logger
from config import conf
from wechatpy import parse_message
from wechatpy.replies import create_reply, ImageReply, VoiceReply

# This class is instantiated once per query
class Query:
    def GET(self):
        return verify_server(web.input())

    def POST(self):
        try:
            request_time = time.time()
            channel = WechatMPChannel()
            message = web.data() # todo crypto
            msg = parse_message(message)
            logger.debug("[wechatmp] Receive post data:\n" + message.decode("utf-8"))
            if msg.type == "event":
                logger.info(
                    "[wechatmp] Event {} from {}".format(
                        msg.event, msg.source
                    )
                )
                if msg.event in ["subscribe", "subscribe_scan"]:
                    reply_text = subscribe_msg()
                    replyPost = create_reply(reply_text, msg)
                    return replyPost.render()
                else:
                    return "success"
        
            wechatmp_msg = WeChatMPMessage(msg, client=channel.client)
            if wechatmp_msg.ctype in [ContextType.TEXT, ContextType.IMAGE, ContextType.VOICE]:
                from_user = wechatmp_msg.from_user_id
                content = wechatmp_msg.content
                message_id = wechatmp_msg.msg_id

                supported = True
                if "【收到不支持的消息类型，暂无法显示】" in content:
                    supported = False  # not supported, used to refresh

                # New request
                if (
                    from_user not in channel.cache_dict
                    and from_user not in channel.running
                    or content.startswith("#") 
                    and message_id not in channel.request_cnt # insert the godcmd
                ):
                    # The first query begin
                    if msg.type == "voice" and wechatmp_msg.ctype == ContextType.TEXT and conf().get("voice_reply_voice", False):
                        context = channel._compose_context(
                            wechatmp_msg.ctype, content, isgroup=False, desire_rtype=ReplyType.VOICE, msg=wechatmp_msg
                        )
                    else:
                        context = channel._compose_context(
                            wechatmp_msg.ctype, content, isgroup=False, msg=wechatmp_msg
                        )
                    logger.debug(
                        "[wechatmp] context: {} {} {}".format(context, wechatmp_msg, supported)
                    )

                    if supported and context:
                        # set private openai_api_key
                        # if from_user is not changed in itchat, this can be placed at chat_channel
                        user_data = conf().get_user_data(from_user)
                        context["openai_api_key"] = user_data.get("openai_api_key")
                        channel.running.add(from_user)
                        channel.produce(context)
                    else:
                        trigger_prefix = conf().get("single_chat_prefix", [""])
                        if trigger_prefix or not supported:
                            if trigger_prefix:
                                reply_text = textwrap.dedent(
                                    f"""\
                                    请输入'{trigger_prefix}'接你想说的话跟我说话。
                                    例如:
                                    {trigger_prefix}你好，很高兴见到你。"""
                                )
                            else:
                                reply_text = textwrap.dedent(
                                    """\
                                    你好，很高兴见到你。
                                    请跟我说话吧。"""
                                )
                        else:
                            logger.error(f"[wechatmp] unknown error")
                            reply_text = textwrap.dedent(
                                """\
                                未知错误，请稍后再试"""
                            )
                        
                        replyPost = create_reply(reply_text, msg)
                        return replyPost.render()


                # Wechat official server will request 3 times (5 seconds each), with the same message_id.
                # Because the interval is 5 seconds, here assumed that do not have multithreading problems.
                request_cnt = channel.request_cnt.get(message_id, 0) + 1
                channel.request_cnt[message_id] = request_cnt
                logger.info(
                    "[wechatmp] Request {} from {} {}\n{}\n{}:{}".format(
                        request_cnt,
                        from_user,
                        message_id,
                        content,
                        web.ctx.env.get("REMOTE_ADDR"),
                        web.ctx.env.get("REMOTE_PORT"),
                    )
                )

                task_running = True
                waiting_until = request_time + 4
                while time.time() < waiting_until:
                    if from_user in channel.running:
                        time.sleep(0.1)
                    else:
                        task_running = False
                        break

                reply_text = ""
                if task_running:
                    if request_cnt < 3:
                        # waiting for timeout (the POST request will be closed by Wechat official server)
                        time.sleep(2)
                        # and do nothing, waiting for the next request
                        return "success"
                    else: # request_cnt == 3:
                        # return timeout message
                        reply_text = "【正在思考中，回复任意文字尝试获取回复】"
                        replyPost = create_reply(reply_text, msg)
                        return replyPost.render()

                # reply is ready
                channel.request_cnt.pop(message_id)

                # no return because of bandwords or other reasons
                if (
                    from_user not in channel.cache_dict
                    and from_user not in channel.running
                ):
                    return "success"

                # Only one request can access to the cached data
                try:
                    (reply_type, content) = channel.cache_dict.pop(from_user)
                except KeyError:
                    return "success"

                if (reply_type == "text"):
                    if len(content.encode("utf8")) <= MAX_UTF8_LEN:
                        reply_text = content
                    else:
                        continue_text = "\n【未完待续，回复任意文字以继续】"
                        splits = split_string_by_utf8_length(
                            content,
                            MAX_UTF8_LEN - len(continue_text.encode("utf-8")),
                            max_split=1,
                        )
                        reply_text = splits[0] + continue_text
                        channel.cache_dict[from_user] = ("text", splits[1])
                    
                    logger.info(
                        "[wechatmp] Request {} do send to {} {}: {}\n{}".format(
                            request_cnt,
                            from_user,
                            message_id,
                            content,
                            reply_text,
                        )
                    )
                    replyPost = create_reply(reply_text, msg)
                    return replyPost.render()


                elif (reply_type == "voice"):
                    media_id = content
                    asyncio.run_coroutine_threadsafe(channel.delete_media(media_id), channel.delete_media_loop)
                    replyPost = VoiceReply(message=msg)
                    replyPost.media_id = media_id
                    return replyPost.render()

                elif (reply_type == "image"):
                    media_id = content
                    asyncio.run_coroutine_threadsafe(channel.delete_media(media_id), channel.delete_media_loop)
                    replyPost = ImageReply(message=msg)
                    replyPost.media_id = media_id
                    return replyPost.render()
            else:
                logger.info("暂且不处理")
                return "success"
        except Exception as exc:
            logger.exception(exc)
            return exc