import wolframalpha

from edmond.plugin import Plugin


class WolframAlphaPlugin(Plugin):
    """Handle unknown command by sending it to WolframAlpha."""

    REQUIRED_CONFIGS = ["commands", "api_key", "max_pods"]
    MAX_LENGTH = 256
    CUT_MARK = "..."

    def __init__(self, bot):
        super().__init__(bot)
        self.priority = -6
        self._client = None

    @property
    def client(self):
        if self._client is None and self.has_api_key():
            self._client = wolframalpha.Client(self.config["api_key"])
        return self._client

    def on_welcome(self, _):
        if not self.config["api_key"]:
            self.bot.log_w("API key unavailable.")
            self.is_ready = False

    def on_pubmsg(self, event):
        if not self.should_handle_command(event.arguments[0]):
            return False
        self.process_query(self.command.content, event.target)
        return True

    def process_query(self, query, target):
        self.bot.log_d(f"Processing '{query}' with WolframAlpha.")
        try:
            response = self.client.query(query)
        except Exception as exc:  # unstable lib
            self.bot.log_w(f"wolframalpha exception: {exc}")
            self.signal_failure(target)
            return

        if not response["@success"]:
            self.bot.log_d("Call to WA succeeded but response is an error.")
            self.signal_failure(target)
            return

        inputs = []
        answers = []
        num_pods = 0
        for pod in response.pods:
            for subpod in pod.subpods:
                self.bot.log_d(f"WolframAlpha subpod: {subpod}")
                if pod["@id"] == "Input":
                    inputs.append(self.sanitize_text(subpod.plaintext or ""))
                else:
                    answers.append(self.sanitize_text(subpod.plaintext or ""))
                    num_pods += 1
                if num_pods >= self.config["max_pods"]:
                    break
            if num_pods >= self.config["max_pods"]:
                break

        input_text = ", ".join(inputs)
        answer_text = ", ".join(answers)
        if input_text:
            reply = input_text + " -- " + answer_text
        else:
            reply = answer_text
        if len(reply) > self.MAX_LENGTH - len(self.CUT_MARK):
            reply = (
                reply[: self.MAX_LENGTH - len(self.CUT_MARK)] + self.CUT_MARK
            )
        self.bot.say(target, reply)

    @staticmethod
    def sanitize_text(text):
        return text.replace("\n", ", ")