from dataclasses import dataclass
from enum import Enum, auto


BANGS = ('!',)


def pop_arg(text):
    if text is None:
        return None, None
    parts = text.split(maxsplit=1)
    if len(parts) == 1:
        return parts[0], None
    return parts[0], parts[1].strip()


@dataclass
class RollbotMessage:
    src: str
    name: str
    sender_id: str
    group_id: str
    message_id: str
    message_txt: str
    from_admin: bool

    def __post_init__(self):
        self.is_command = False
        if len(self.message_txt) > 0 and self.message_txt[0] in BANGS:
            cmd, raw = pop_arg(self.message_txt[1:].strip())
            if cmd is not None:
                self.is_command = True
                self.command = cmd.lower()
                self.raw_args = raw

    @staticmethod
    def from_groupme(msg, global_admins=(), group_admins={}):
        sender_id = msg["sender_id"]
        group_id = msg["group_id"]
        return RollbotMessage(
            "GROUPME",
            msg["name"],
            sender_id,
            group_id,
            msg["id"],
            msg["text"].strip(),
            sender_id in global_admins or (
                group_id in group_admins and
                sender_id in group_admins[group_id])
        )

    @staticmethod
    def from_discord(msg, global_admins=(), group_admins={}):
        sender_id = str(msg.author.id)
        group_id = str(msg.channel.id)
        return RollbotMessage(
            "DISCORD",
            msg.author.name,
            sender_id,
            group_id,
            msg.id,
            msg.content.strip(),
            sender_id in global_admins or (
                group_id in group_admins and
                sender_id in group_admins[group_id])
        )

    def args(self, normalize=True):
        arg, rest = pop_arg(self.raw_args)
        while arg is not None:
            yield arg.lower() if normalize else arg
            arg, rest = pop_arg(rest)


class RollbotFailure(Enum):
    INVALID_COMMAND = auto()
    MISSING_SUBCOMMAND = auto()
    INVALID_SUBCOMMAND = auto()
    INVALID_ARGUMENTS = auto()
    SERVICE_DOWN = auto()
    PERMISSIONS = auto()
    INTERNAL_ERROR = auto()


_RESPONSE_TEMPLATE = """Response{
    Original Message: %s,
    Text Response: %s,
    Image Response: %s,
    Respond: %s,
    Failure Reason: %s,
    Failure Notes: %s
}"""


@dataclass
class RollbotResponse:
    msg: RollbotMessage
    txt: str = None
    img: str = None
    respond: bool = True
    failure: RollbotFailure = None
    debugging: dict = None

    def __post_init__(self):
        self.info = _RESPONSE_TEMPLATE % (self.msg, self.txt, self.img, self.respond, self.failure, self.debugging)
        self.is_success = self.failure is None
        if self.failure is None:
            self.failure_msg = None
        elif self.failure == RollbotFailure.INVALID_COMMAND:
            self.failure_msg = "Sorry - I don't think I understand the command '!%s'... " % self.msg.command \
                    + "I'll try to figure it out and get back to you!"
        elif self.failure == RollbotFailure.MISSING_SUBCOMMAND:
            self.failure_msg = "Sorry - !%s requires a sub-command." % self.msg.command
        elif self.failure == RollbotFailure.INVALID_SUBCOMMAND:
            self.failure_msg = "Sorry - the sub-command you used for %s was not valid." % self.msg.command
        elif self.failure == RollbotFailure.INVALID_ARGUMENTS:
            self.failure_msg = "Sorry - %s cannot use those arguments!" % self.msg.command
        elif self.failure == RollbotFailure.SERVICE_DOWN:
            self.failure_msg = "Sorry - %s relies on a service I couldn't reach!" % self.msg.command
        elif self.failure == RollbotFailure.PERMISSIONS:
            self.failure_msg = "Sorry - you don't have permission to use that command or sub-command in this chat!"
        elif self.failure == RollbotFailure.INTERNAL_ERROR:
            self.failure_msg = "Sorry - I encountered an unrecoverable error, please review internal logs."

        if self.debugging is not None and "explain" in self.debugging:
            self.failure_msg += " " + self.debugging["explain"]