import os
import sys
import time
import copy
import json
import pprint
import threading
import traceback

from mastodon import Mastodon

def log_obj_str(obj):
    if isinstance(obj, str):
        return obj.strip()
    else:
        return pprint.pformat(obj).strip()

class BotClient:
    DEFAULT_STATE = {"min_status_id": "0"}
    
    def __init__(self, bot, config):
        self.bot = bot
        self.config = {
            "base_url": "https://{}".format(config["name"]),
            "client_file": os.path.join("clients", config["name"], "client.secret"),
            "user_file": os.path.join("clients", config["name"], "user.secret"),
            "state_file": os.path.join("clients", config["name"], "state.json"),
            "cringe_dir": os.path.join("clients", config["name"], "cringe"),
            "based_dir": os.path.join("clients", config["name"], "based"), 
            "unsure_dir": os.path.join("clients", config["name"], "unsure"), **config}
      
        self.load_state()
        
        self.poll_thread = threading.Thread(
            target = self.poll_loop,
            name = "{} Poll Loop".format(self.config["name"]),
            args = (),
            kwargs = {},
            daemon = True)
    
    def log_str(self, obj = "", infix = str()):
        return self.bot.log_str(obj, infix = "{}: {}".format(self.config["name"], infix))

    def log(self, obj = "", infix = str()):
        return self.bot.log(obj, infix = "{}: {}".format(self.config["name"], infix))

    def setup(self):
        client_file_path = os.path.join(os.path.dirname(sys.argv[0]), self.config["client_file"])
        os.makedirs(os.path.dirname(client_file_path), exist_ok = True)
        if not os.path.exists(client_file_path):
            Mastodon.create_app(
                self.app_name,
                api_base_url = self.config["base_url"],
                to_file = client_file_path)
         
        user_file_path = os.path.join(os.path.dirname(sys.argv[0]), self.config["user_file"])
        os.makedirs(os.path.dirname(client_file_path), exist_ok = True)
        if not os.path.exists(user_file_path):
            api = Mastodon(
                api_base_url = self.config["base_url"],
                client_id = client_file_path)
        
            auth_url = api.auth_request_url()
            
            self.log("Go to:")
            self.log(auth_url)
            self.log()
            
            auth_code = input(log_string("Enter code: "))
            
            self.log()

            api.log_in(code = auth_code, to_file = user_file_path)

        self.api = Mastodon(
            access_token = user_file_path,
            api_base_url = self.config["base_url"])

    def start(self):
        self.poll_thread.start()
        self.on_start()

    def poll_loop(self):
        while True:
            try:
                statuses = self.api.timeline(min_id = self.state["min_status_id"])

                if len(statuses) == 0:
                    self.on_poll()
                    time.sleep(self.config["poll_interval"])
                else:
                    self.on_wake()

                    while len(statuses) > 0:
                        self.on_status_page(statuses)
                        
                        for status in sorted(statuses,
                                key = lambda status: status["created_at"]):

                            self.on_status(status)
                            self.state["min_status_id"] = status["id"]
                        
                        time.sleep(self.config["rate_limit"])
                        statuses = self.api.fetch_previous(statuses)

                self.save_state()
            
            except Exception as exc:
                self.on_poll_exception(exc)
                time.sleep(self.config["retry_rate"])

    def load_state(self):
        self.state = self.on_load_state()

    def save_state(self):
        state = self.state.copy()
        self.on_save_state(state)

    def on_start(self):
        pass

    def on_poll(self):
        pass

    def on_poll_exception(self, exc):
        self.log(traceback.format_exc())

    def on_wake(self):
        pass

    def on_status_page(self, statuses):
        pass

    def on_status(self, status):
        pass

    def on_load_state(self):
        state_file_path = os.path.join(os.path.dirname(sys.argv[0]), self.config["state_file"])
        if os.path.exists(state_file_path):
            os.makedirs(os.path.dirname(state_file_path), exist_ok = True)
            with open(state_file_path) as json_file:
                return json.load(json_file)

        return copy.deepcopy(self.DEFAULT_STATE)
    
    def on_save_state(self, state):
        state_file_path = os.path.join(os.path.dirname(sys.argv[0]), self.config["state_file"])
        os.makedirs(os.path.dirname(state_file_path), exist_ok = True)
        with open(state_file_path, "w") as json_file:
            json.dump(state, json_file, indent = 4)

class Bot:
    DEFAULT_CONFIG = {
        "name": "generic-bot",
        "defaults": {
            "app_name": "Generic Bot",
            "rate_limit": 1,
            "retry_rate": 60,
            "poll_interval": 10
        },
        "clients": {
            "mastodon.social": {}}}

    def __init__(self, client_type = BotClient, config = {}):
        self.clients = {}

        self.client_type = client_type
        
        self.config = {**self.DEFAULT_CONFIG, **config}
        self.config["defaults"] = {**self.DEFAULT_CONFIG["defaults"], **config.get("defaults", {})}

    def log_str(self, obj, infix = str()):
        prefix = "{}: {}".format(self.config["name"], infix)
        return prefix + log_obj_str(obj).replace("\n", "\n" + prefix)

    def log(self, *args, **kwargs):
        print(self.log_str(*args, **kwargs))

    def start(self):
        self.clients = self.on_start_clients(self.config["clients"])
        self.on_clients_started(self.clients)

    def on_start_clients(self, client_configs):
        clients = {}
        for client_name, client_config in client_configs.items():
            client_config = {
                **self.config["defaults"],
                **{"name": client_name},
                **client_config}
            client = self.on_init_client(client_name, client_config)
            client.setup()
            clients[client_config["name"]] = client

        start_interval = self.config["defaults"]["poll_interval"] / len(self.config["clients"])
        for client in clients.values():
            client.start()
            time.sleep(start_interval)

        return clients

    def on_init_client(self, client_name, client_config):
        return self.client_type(self, client_config)

    def on_clients_started(self, clients):
        pass