try:
    from translate import Translator
    DEPENDENCIES_FOUND = True
except ImportError:
    DEPENDENCIES_FOUND = False

from edmond.plugin import Plugin


class TranslatePlugin(Plugin):

    REQUIRED_CONFIGS = [
        "commands", "default_dest", "param_source", "param_dest",
    ]

    def __init__(self, bot):
        super().__init__(bot)

    def on_pubmsg(self, event):
        if not self.should_handle_command(event.arguments[0]):
            return False

        text = self.command.content
        if not text:
            self.signal_failure(event.target)
            return True
        words = text.split()
        if len(words) == 0:
            self.signal_failure(event.target)
            return True

        from_lang, to_lang, text = self.parse_words(words)
        self.bot.log_d(f"Translating '{text}' from {from_lang} to {to_lang}.")
        translator = Translator(to_lang=to_lang, from_lang=from_lang)
        translation = translator.translate(text)
        self.bot.say(event.target, translation)
        return True

    def parse_words(self, words):
        """Parse given words for parameters and return (from, to, text)."""
        from_lang = "autodetect"
        to_lang = self.config["default_dest"]
        num_param_found = 0
        for word in words:
            if not word.startswith("!"):
                break
            num_param_found += 1
            param_word = word.lstrip("!")
            if not ":" in param_word:
                continue
            param_name, param_value = param_word.split(":")
            if param_name == self.config["param_source"]:
                from_lang = param_value
            elif param_name == self.config["param_dest"]:
                to_lang = param_value
        return from_lang, to_lang, " ".join(words[num_param_found:])