import json
from typing import Union
from discord import User, Member, Interaction, Guild
from discord.errors import NotFound, Forbidden
from redbot.core import commands
import database as db
from .embed_factory import embed_factory
from .config import config


async def check_conf(config_list: list):
    """Checks if any required config options are not set."""
    not_found_list = []

    for item in config_list:
        if await config.item() == " ":
            not_found_list.append(item)

    return not_found_list


def check_permissions(
    user: User,
    permissions: list,
    ctx: Union[commands.Context, Interaction] = None,
    guild: Guild = None,
):
    """Checks if a user has a specific permission (or a list of permissions) in a channel."""
    if ctx:
        member = ctx.guild.get_member(user.id)
        resolved_permissions = ctx.channel.permissions_for(member)

    elif guild:
        member = guild.get_member(user.id)
        resolved_permissions = member.guild_permissions

    else:
        raise (KeyError)

    for permission in permissions:
        if (
            not getattr(resolved_permissions, permission, False)
            and not resolved_permissions.administrator is True
        ):
            return permission

    return False


async def check_moddable(
    target: Union[User, Member], interaction: Interaction, permissions: list
):
    """Checks if a moderator can moderate a target."""
    if check_permissions(interaction.client.user, permissions, guild=interaction.guild):
        await interaction.response.send_message(
            f"I do not have the `{permissions}` permission, required for this action.",
            ephemeral=True,
        )
        return False

    if await config.guild(interaction.guild).use_discord_permissions() is True:
        if check_permissions(interaction.user, permissions, guild=interaction.guild):
            await interaction.response.send_message(
                f"You do not have the `{permissions}` permission, required for this action.",
                ephemeral=True,
            )
            return False

    if interaction.user.id == target.id:
        await interaction.response.send_message(
            content="You cannot moderate yourself!", ephemeral=True
        )
        return False

    if target.bot:
        await interaction.response.send_message(
            content="You cannot moderate bots!", ephemeral=True
        )
        return False

    if isinstance(target, Member):
        if interaction.user.top_role <= target.top_role:
            await interaction.response.send_message(
                content="You cannot moderate members with a higher role than you!",
                ephemeral=True,
            )
            return False

        if (
            interaction.guild.get_member(interaction.client.user.id).top_role
            <= target.top_role
        ):
            await interaction.response.send_message(
                content="You cannot moderate members with a role higher than the bot!",
                ephemeral=True,
            )
            return False

        immune_roles = await config.guild(target.guild).immune_roles()

        for role in target.roles:
            if role.id in immune_roles:
                await interaction.response.send_message(
                    content="You cannot moderate members with an immune role!",
                    ephemeral=True,
                )
                return False

    return True


async def get_next_case_number(guild_id: str, cursor=None):
    """This method returns the next case number from the MySQL table for a specific guild."""
    if not cursor:
        database = await db.connect()
        cursor = database.cursor()
    cursor.execute(
        f"SELECT moderation_id FROM `moderation_{guild_id}` ORDER BY moderation_id DESC LIMIT 1"
    )
    return cursor.fetchone()[0] + 1


def generate_dict(result):
    case: dict = {
        "moderation_id": result[0],
        "timestamp": result[1],
        "moderation_type": result[2],
        "target_id": result[3],
        "moderator_id": result[4],
        "role_id": result[5],
        "duration": result[6],
        "end_timestamp": result[7],
        "reason": result[8],
        "resolved": result[9],
        "resolved_by": result[10],
        "resolve_reason": result[11],
        "expired": result[12],
        "changes": json.loads(result[13]),
        "metadata": json.loads(result[14]),
    }
    return case


async def fetch_user_dict(interaction: Interaction, user_id: str):
    """This method returns a dictionary containing either user information or a standard deleted user template."""
    if user_id == "?":
        user_dict = {"id": "?", "name": "Unknown User", "discriminator": "0"}

    else:
        try:
            user = interaction.client.get_user(user_id)
            if user is None:
                user = await interaction.client.fetch_user(user_id)

            user_dict = {
                "id": user.id,
                "name": user.name,
                "discriminator": user.discriminator,
            }

        except NotFound:
            user_dict = {
                "id": user_id,
                "name": "Deleted User",
                "discriminator": "0",
            }

    return user_dict


async def fetch_role_dict(interaction: Interaction, role_id: str):
    """This method returns a dictionary containing either role information or a standard deleted role template."""
    try:
        role = interaction.guild.get_role(role_id)

        role_dict = {"id": role.id, "name": role.name}

    except NotFound:
        role_dict = {"id": role_id, "name": "Deleted Role"}

    return role_dict


async def log(interaction: Interaction, moderation_id: int, resolved: bool = False):
    """This method sends a message to the guild's configured logging channel when an infraction takes place."""
    logging_channel_id = await config.guild(interaction.guild).log_channel()
    if logging_channel_id != " ":
        logging_channel = interaction.guild.get_channel(logging_channel_id)

        case = await db.fetch_case(moderation_id, interaction.guild.id)
        if case:
            embed = await embed_factory(
                "log", interaction=interaction, case_dict=case, resolved=resolved
            )
            try:
                await logging_channel.send(embed=embed)
            except Forbidden:
                return