from datetime import datetime, timedelta
from obspython import *
from services.Service import Service
from threading import Thread
import os.path
import time

KNOWN_COMMANDS = ["addmsg", "delmsg", "listmsg"]

SEPARATOR = ";"
SUBST_SEP = ".,"

class TimedMessageService(Service):

    title = "Timed Message Service"
    enabled = False

    msg_added = ""
    msg_deleted = ""
    msg_not_deleted = ""

    file = ""
    messages = {}
    interval = 60
    running = False

    def knows(self, command):
        return command in KNOWN_COMMANDS

    def eval(self, command, response, users):
        can_manage = False
        for badge in response["tags"]["badges"]:
            if badge["name"] in ["broadcaster", "moderator"]:
                can_manage = True
        if not can_manage:
            return
        if command == "addmsg":
            self.queue.append(self.add(response))
        elif command == "delmsg":
            self.queue.append(self.delete(response))
        elif command == "listmsg":
            self.queue.append(self.list(response))

    def list_commands(self):
        return KNOWN_COMMANDS

    def start(self):
        self.load_file()
        self.init_time()
        self.running = True
        thread = Thread(target=self.dispatch)
        thread.daemon = True
        thread.start()

    def load_file(self):
        if self.file == "" or not os.path.isfile(self.file):
            return
        with open(self.file, "r", encoding="utf-8") as file:
            content = file.read().splitlines()
        for line in content:
            self.load_message(line)

    def load_message(self, line):
        components = line.split(SEPARATOR)
        starting_time = datetime.now()
        self.messages[components[0]] = {
            "interval": int(components[1]),
            "next_time": "",
            "message": components[2].replace(SUBST_SEP, SEPARATOR)
        }

    def init_time(self):
        starting_time = datetime.now()
        times = []
        for msg_id in self.messages:
            new_time = starting_time + timedelta(minutes = self.messages[msg_id]["interval"])
            formatted = new_time.strftime("%H:%M")
            while formatted in times:
                new_time += timedelta(minutes = 3)
                formatted = new_time.strftime("%H:%M")
            times.append(formatted)
            self.messages[msg_id]["next_time"] = formatted

    def stop(self):
        self.running = False

    # OBS subset -----

    def create_properties(self):
        props = obs_properties_create()
        obs_properties_add_path(props, "tmsg_file", "Messages list", OBS_PATH_FILE, "Text file (*.txt)", None)
        obs_properties_add_text(props, "tmsg_msg_added", "Message: Message added", OBS_TEXT_DEFAULT)
        obs_properties_add_text(props, "tmsg_msg_deleted", "Message: Message deleted", OBS_TEXT_DEFAULT)
        obs_properties_add_text(props, "tmsg_msg_not_deleted", "Message: Message not deleted", OBS_TEXT_DEFAULT)
        return props

    def update(self, settings):
        self.file = obs_data_get_string(settings, "tmsg_file")
        self.msg_added = obs_data_get_string(settings, "tmsg_msg_added")
        self.msg_deleted = obs_data_get_string(settings, "tmsg_msg_deleted")
        self.msg_not_deleted = obs_data_get_string(settings, "tmsg_msg_not_deleted")

    # Commands -----

    def add(self, response):
        current_time = datetime.now()
        components = response["message"].split(" ", 3)
        print(components)
        self.messages[components[1]] = {
            "interval": int(components[2]),
            "next_time": "",
            "message": components[3],
        }
        next_time = current_time + timedelta(minutes = self.messages[components[1]]["interval"])
        self.messages[components[1]]["next_time"] = next_time.strftime("%H:%M")
        self.write()
        return f"{self.msg_added}"

    def delete(self, response):
        msg_id = response["message"].split(" ", 2)[1]
        if msg_id not in self.messages:
            return f"{self.msg_not_deleted}"
        self.messages.pop(msg_id)
        self.write()
        return f"{self.msg_deleted}"
    
    def list(self, response):
        return " ".join(self.messages)

    def write(self):
        with open(self.file, "w", encoding="utf-8") as file:
            for msg_id, message in self.messages.items():
                file.write(f"{msg_id}{SEPARATOR}{message['interval']}{SEPARATOR}{message['message'].replace(SEPARATOR, SUBST_SEP)}\n");

    # Main function -----

    def dispatch(self):
        while self.running:
            current_time = datetime.now()
            formatted = current_time.strftime("%H:%M")
            for msg_id in self.messages:
                if self.messages[msg_id]["next_time"] != formatted:
                    continue
                self.queue.append(self.messages[msg_id]["message"])
                new_time = current_time + timedelta(minutes = self.messages[msg_id]["interval"])
                self.messages[msg_id]["next_time"] = new_time.strftime("%H:%M")
                break
            time.sleep(self.interval)