import json
import re
import sys

sys.path.insert(1, "./d.py")
import discord
from discord.ext import commands, tasks
from dotenv import load_dotenv
from os import getenv
from github_connector import create_or_update_file, delete_file, similar_exists


load_dotenv("./.env")
DISCORD_TOKEN = getenv("DISCORD_TOKEN")

# Intents are required to listen to events like messages
intents = discord.Intents.default()
intents.message_content = True
intents.members = True
intents.reactions = True
intents.dm_messages = True

# Create an instance of the Bot
bot = commands.Bot(command_prefix="!", intents=intents)


def getCommitMessage(event):
    return f"{event.start_time.strftime("%Y-%m-%d")}_{event.name}"


def getFilePath(event):
    return f"_events/{event.start_time.strftime("%Y")}/discord-event-{event.id}.md"


days = {
    0: "MO",
    1: "TU",
    2: "WE",
    3: "TH",
    4: "FR",
    5: "SA",
    6: "SU",
}


def asDayStr(day):
    return days[day]


def asDayToupleStr(day):
    return f"{day[0]}{days[day[1]]}"


def weekdaysToString(weekdays):
    asStr = map(asDayStr, weekdays)
    return ",".join(asStr)


def n_weekdaysToString(weekdays):
    asStr = map(asDayToupleStr, weekdays)
    return ",".join(asStr)


def getRrule(event):
    recurrence_rule = event.recurrence_rule
    rrule = ""
    if hasattr(recurrence_rule, "frequency") and hasattr(recurrence_rule, "interval"):
        freq = f"FREQ={str.upper(recurrence_rule.frequency.name)};"
        inter = f"INTERVAL={recurrence_rule.interval};"
        dtstart = f'DTSTART={event.start_time.strftime("%Y%m%dT%H%M%S")}'

        if hasattr(recurrence_rule, "weekdays") and len(recurrence_rule.weekdays) != 0:
            rrule = f'rrule: "{freq}{inter}BYDAY={weekdaysToString(recurrence_rule.weekdays)};{dtstart}"\n'
        elif (
            hasattr(recurrence_rule, "n_weekdays")
            and len(recurrence_rule.n_weekdays) != 0
        ):
            rrule = f'rrule: "{freq}{inter}BYDAY={n_weekdaysToString(recurrence_rule.n_weekdays)};{dtstart}"\n'
        else:
            rrule = f'rrule: "{freq}{inter}{dtstart}"\n'
    return rrule


def getEventYML(event):
    base = f'---\nlayout: event\ntitle: "{event.name}"\nauthor: "Netz39 e.V." \nevent:\n  start: {event.start_time.strftime("%Y-%m-%d %H:%M:%S")} \n  end:   {event.end_time.strftime("%Y-%m-%d %H:%M:%S")} \n  organizer: "Netz39 Team <kontakt@netz39.de>" \n  location: "Leibnizstr. 18, 39104 Magdeburg"\n'
    comment = "<!-- event imported from discord manual changes may be overwritten -->"
    if hasattr(event, "recurrence_rule"):
        rrule = getRrule(event)
        return f"{base}{rrule}---\n{comment}"
    else:
        return f"{base}---\n{comment}"


def getAdmins(guild):
    admins = []
    for member in guild.members:
        if member.guild_permissions.administrator:
            admins.append(member.id)
    return admins


@tasks.loop(hours=24)  # Runs every 7 days
async def check_events():
    await bot.wait_until_ready()
    for guild in bot.guilds:
        scheduledEvents = await guild.fetch_scheduled_events()
        for event in scheduledEvents:
            await handleEvent(event)


async def handleEvent(event, isNew=True):
    guild = event.guild
    channel = guild.system_channel
    admins = getAdmins(guild)

    eventYML = getEventYML(event)
    file_path = getFilePath(event)
    commit_message = getCommitMessage(event)
    if event.creator_id in admins or similar_exists(event.name):
        create_or_update_file(
            file_path,
            eventYML,
            f"{commit_message}",
        )
        if isNew:
            await channel.send(
                f"📅 New event '{event.name}' on {event.start_time.strftime("%Y-%m-%d")}."
            )
    else:
        eventJSON = json.dumps(
            {
                "yml": eventYML,
                "path": file_path,
                "fileName": commit_message,
                "name": event.name,
                "date": event.start_time.strftime("%Y-%m-%d"),
            },
            indent=2,
        )
        for admin in admins:
            user = await bot.fetch_user(event.creator_id)
            await sendDm(
                admin,
                f"{user.name} added a new Event on {event.start_time.strftime("%Y")}: {event.name}. Like this message to approve.\n\n\n```json\n{eventJSON}```",
            )


# Event: When the bot is ready
@bot.event
async def on_ready():
    print(f"Logged in as {discord.user}")


# Command: !hello
@bot.command()
async def hello(ctx):
    await ctx.send(
        "Hello, I am a bot to add events from discord to the Netz39 calendar on the website!"
    )


@bot.event
async def on_ready():
    print(f"Logged in as {bot.user}")
    for guild in bot.guilds:
        system_channel = guild.system_channel
        if system_channel:
            await system_channel.send("Hello everyone! I'm online and ready to go! 📅")
    await check_events()


@bot.event
async def on_scheduled_event_update(before, after):
    if after.status != "canceled":
        await handleEvent(after, False)


@bot.event
async def on_scheduled_event_create(event):
    await handleEvent(event)


async def sendDm(userID, message):
    user = await bot.fetch_user(userID)
    await user.send(message)


@bot.event
async def on_reaction_add(reaction, user):
    message = reaction.message
    channel = message.channel
    guild = message.guild

    admins = getAdmins(guild)
    if not user.id in admins:
        return  # Ignore non-maintainers
    if user.bot:
        return  # Ignore bot reactions

    if (
        isinstance(message.channel, discord.DMChannel) and message.author.bot
    ):  # Check if it's a DM and from the bot
        if reaction.emoji == "👍":
            messageJSON = json.loads(
                re.search(
                    "(?s)(?<=```json).*?(?=```)", reaction.message.content
                ).group()
            )
            create_or_update_file(
                messageJSON["path"],
                messageJSON["yml"],
                f"new event: {messageJSON["fileName"]}",
            )
            await channel.send(
                f"📅 New event '{messageJSON["name"]}' on {messageJSON["date"]}."
            )


@bot.event
async def on_scheduled_event_delete(event):
    delete_file(getFilePath(event))
    guild = event.guild
    channel = guild.system_channel
    await channel.send(f"❌ Event has been canceled: {event.name}")


bot.run(DISCORD_TOKEN)