import re

from edmond.plugin import Plugin


class NotesPlugin(Plugin):

    REQUIRED_CONFIGS = [
        "commands", "content_regex", "confirmation", "deliver_format", "limit",
        "too_many_notes"
    ]

    def __init__(self, bot):
        super().__init__(bot)
        self._content_re = None

    @property
    def content_re(self):
        if self._content_re is None:
            self._content_re = re.compile(self.config["content_regex"])
        return self._content_re

    def on_join(self, event):
        nick = event.source.nick
        if nick == self.bot.nick:
            return
        self.deliver_notes(event.target, nick)

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

        # "note down" command.
        if self.command.ident == self.config["commands"][0]:
            content = self.command.raw[len(self.command.match):].strip()
            match = self.content_re.match(content)
            if not match:
                return False
            groups = match.groupdict()
            if any(k not in groups for k in ("target", "note")):
                return False
            target = groups["target"]

            # Check we did not reach our note limits.
            if self.count_user_notes(target) >= self.config["limit"]:
                self.bot.say(event.target, self.config["too_many_notes"])
                return True

            message = groups["note"]
            self.bot.log_d(f"Noting for {target}: {message}")
            note = {
                "sender": event.source.nick,
                "dest": target,
                "message": message
            }
            self.append_storage_list_value("notes", note)
            self.bot.say(event.target, self.config["confirmation"])
            return True

        # "deliver notes for me" command.
        if self.command.ident == self.config["commands"][1]:
            self.deliver_notes(event.target, event.source.nick)
            return True

        return False

    def deliver_notes(self, target, nick):
        """Deliver all notes for this user in the target channel/user."""
        notes = self.get_storage_value("notes", [])
        notes = list(filter(lambda n: n["dest"] == nick, notes))
        self.bot.log_d(f"Delivering {len(notes)} notes to {nick}.")
        for note in notes:
            message = self.config["deliver_format"].format(
                sender=note["sender"],
                dest=nick,
                message=note["message"],
            )
            self.bot.say(target, message)
            self.remove_storage_list_value("notes", note)

    def count_user_notes(self, nick):
        """Count the number of undelivered notes this user has."""
        notes = self.get_storage_value("notes", [])
        return sum(note["dest"] == nick for note in notes)