import re
from typing import Any, Dict, Union, Tuple, Iterable, Optional

from nonebot.typing import overrides
from nonebot.adapters import Message as BaseMessage, MessageSegment as BaseMessageSegment

from .utils import log, escape, unescape, _b2s


class MessageSegment(BaseMessageSegment):
    """
    CQHTTP 协议 MessageSegment 适配。具体方法参考协议消息段类型或源码。
    """

    @overrides(BaseMessageSegment)
    def __init__(self, type: str, data: Dict[str, Any]) -> None:
        if type == "text":
            data["text"] = unescape(data["text"])
        super().__init__(type=type, data=data)

    @overrides(BaseMessageSegment)
    def __str__(self) -> str:
        type_ = self.type
        data = self.data.copy()

        # process special types
        if type_ == "text":
            return escape(
                data.get("text", ""),  # type: ignore
                escape_comma=False)

        params = ",".join(
            [f"{k}={escape(str(v))}" for k, v in data.items() if v is not None])
        return f"[CQ:{type_}{',' if params else ''}{params}]"

    @overrides(BaseMessageSegment)
    def __add__(self, other) -> "Message":
        return Message(self) + other

    @overrides(BaseMessageSegment)
    def is_text(self) -> bool:
        return self.type == "text"

    @staticmethod
    def anonymous(ignore_failure: Optional[bool] = None) -> "MessageSegment":
        return MessageSegment("anonymous", {"ignore": _b2s(ignore_failure)})

    @staticmethod
    def at(user_id: Union[int, str]) -> "MessageSegment":
        return MessageSegment("at", {"qq": str(user_id)})

    @staticmethod
    def contact_group(group_id: int) -> "MessageSegment":
        return MessageSegment("contact", {"type": "group", "id": str(group_id)})

    @staticmethod
    def contact_user(user_id: int) -> "MessageSegment":
        return MessageSegment("contact", {"type": "qq", "id": str(user_id)})

    @staticmethod
    def dice() -> "MessageSegment":
        return MessageSegment("dice", {})

    @staticmethod
    def face(id_: int) -> "MessageSegment":
        return MessageSegment("face", {"id": str(id_)})

    @staticmethod
    def forward(id_: str) -> "MessageSegment":
        log("WARNING", "Forward Message only can be received!")
        return MessageSegment("forward", {"id": id_})

    @staticmethod
    def image(file: str,
              type_: Optional[str] = None,
              cache: bool = True,
              proxy: bool = True,
              timeout: Optional[int] = None) -> "MessageSegment":
        return MessageSegment(
            "image", {
                "file": file,
                "type": type_,
                "cache": cache,
                "proxy": proxy,
                "timeout": timeout
            })

    @staticmethod
    def json(data: str) -> "MessageSegment":
        return MessageSegment("json", {"data": data})

    @staticmethod
    def location(latitude: float,
                 longitude: float,
                 title: Optional[str] = None,
                 content: Optional[str] = None) -> "MessageSegment":
        return MessageSegment(
            "location", {
                "lat": str(latitude),
                "lon": str(longitude),
                "title": title,
                "content": content
            })

    @staticmethod
    def music(type_: str, id_: int) -> "MessageSegment":
        return MessageSegment("music", {"type": type_, "id": id_})

    @staticmethod
    def music_custom(url: str,
                     audio: str,
                     title: str,
                     content: Optional[str] = None,
                     img_url: Optional[str] = None) -> "MessageSegment":
        return MessageSegment(
            "music", {
                "type": "custom",
                "url": url,
                "audio": audio,
                "title": title,
                "content": content,
                "image": img_url
            })

    @staticmethod
    def node(id_: int) -> "MessageSegment":
        return MessageSegment("node", {"id": str(id_)})

    @staticmethod
    def node_custom(user_id: int, nickname: str,
                    content: Union[str, "Message"]) -> "MessageSegment":
        return MessageSegment("node", {
            "user_id": str(user_id),
            "nickname": nickname,
            "content": content
        })

    @staticmethod
    def poke(type_: str, id_: str) -> "MessageSegment":
        return MessageSegment("poke", {"type": type_, "id": id_})

    @staticmethod
    def record(file: str,
               magic: Optional[bool] = None,
               cache: Optional[bool] = None,
               proxy: Optional[bool] = None,
               timeout: Optional[int] = None) -> "MessageSegment":
        return MessageSegment("record", {"file": file, "magic": _b2s(magic)})

    @staticmethod
    def reply(id_: int) -> "MessageSegment":
        return MessageSegment("reply", {"id": str(id_)})

    @staticmethod
    def rps() -> "MessageSegment":
        return MessageSegment("rps", {})

    @staticmethod
    def shake() -> "MessageSegment":
        return MessageSegment("shake", {})

    @staticmethod
    def share(url: str = "",
              title: str = "",
              content: Optional[str] = None,
              img_url: Optional[str] = None) -> "MessageSegment":
        return MessageSegment("share", {
            "url": url,
            "title": title,
            "content": content,
            "img_url": img_url
        })

    @staticmethod
    def text(text: str) -> "MessageSegment":
        return MessageSegment("text", {"text": text})

    @staticmethod
    def video(file: str,
              cache: Optional[bool] = None,
              proxy: Optional[bool] = None,
              timeout: Optional[int] = None) -> "MessageSegment":
        return MessageSegment("video", {
            "file": file,
            "cache": cache,
            "proxy": proxy,
            "timeout": timeout
        })

    @staticmethod
    def xml(data: str) -> "MessageSegment":
        return MessageSegment("xml", {"data": data})


class Message(BaseMessage):
    """
    CQHTTP 协议 Message 适配。
    """

    @staticmethod
    @overrides(BaseMessage)
    def _construct(msg: Union[str, dict, list]) -> Iterable[MessageSegment]:
        if isinstance(msg, dict):
            yield MessageSegment(msg["type"], msg.get("data") or {})
            return
        elif isinstance(msg, list):
            for seg in msg:
                yield MessageSegment(seg["type"], seg.get("data") or {})
            return

        def _iter_message(msg: str) -> Iterable[Tuple[str, str]]:
            text_begin = 0
            for cqcode in re.finditer(
                    r"\[CQ:(?P<type>[a-zA-Z0-9-_.]+)"
                    r"(?P<params>"
                    r"(?:,[a-zA-Z0-9-_.]+=?[^,\]]*)*"
                    r"),?\]", msg):
                yield "text", unescape(msg[text_begin:cqcode.pos +
                                           cqcode.start()])
                text_begin = cqcode.pos + cqcode.end()
                yield cqcode.group("type"), cqcode.group("params").lstrip(",")
            yield "text", unescape(msg[text_begin:])

        for type_, data in _iter_message(msg):
            if type_ == "text":
                if data:
                    # only yield non-empty text segment
                    yield MessageSegment(type_, {"text": data})
            else:
                data = {
                    k: v for k, v in map(
                        lambda x: x.split("=", maxsplit=1),
                        filter(lambda x: x, (
                            x.lstrip() for x in data.split(","))))
                }
                yield MessageSegment(type_, data)