# pylint: disable=cyclic-import
from datetime import datetime, timedelta
from typing import Optional, Tuple, Union

import aiosqlite
from dateutil.relativedelta import relativedelta as rd
from discord import File, Guild, Interaction, Member, SelectOption, TextChannel, User
from discord.errors import Forbidden
from redbot.core import commands, data_manager
from redbot.core.utils.chat_formatting import error

from ..models.type import Type
from ..utilities.config import config
from ..utilities.json import dumps
from ..utilities.logger import logger


def check_permissions(
    user: User,
    permissions: Tuple[str],
    ctx: commands.Context | Interaction | None = None,
    guild: Guild | None = None,
) -> Union[bool, str]:
    """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 resolved_permissions.administrator is not True
        ):
            return permission

    return False


async def check_moddable(
    target: Union[User, Member, TextChannel], ctx: commands.Context, permissions: Tuple[str], moderation_type: Type,
) -> bool:
    """Checks if a moderator can moderate a target."""
    is_channel = isinstance(target, TextChannel)

    use_discord_permissions = await config.custom("types", ctx.guild.id, moderation_type.key).use_discord_permissions()
    if use_discord_permissions is None:
        use_discord_permissions = await config.guild(ctx.guild).use_discord_permissions()

    if check_permissions(ctx.bot.user, permissions, guild=ctx.guild):
        await ctx.send(
            error(
                f"I do not have the `{permissions}` permission, required for this action."
            ),
            ephemeral=True,
        )
        return False

    if use_discord_permissions is True:
        if check_permissions(ctx.author, permissions, guild=ctx.guild):
            await ctx.send(
                error(
                    f"You do not have the `{permissions}` permission, required for this action."
                ),
                ephemeral=True,
            )
            return False

    if ctx.author.id == target.id:
        await ctx.send(
            content="You cannot moderate yourself!", ephemeral=True
        )
        return False

    if not is_channel and target.bot:
        await ctx.send(
            content="You cannot moderate bots!", ephemeral=True
        )
        return False

    if isinstance(target, Member):
        if ctx.author.top_role <= target.top_role and await config.guild(ctx.guild).respect_hierarchy() is True:
            await ctx.send(
                content=error(
                    "You cannot moderate members with a higher role than you!"
                ),
                ephemeral=True,
            )
            return False

        if target.guild_permissions.administrator:
            await ctx.send(
                content="You cannot moderate members with the Administrator permission!", ephemeral=True
            )
            return False

        if (
            ctx.guild.get_member(ctx.bot.user.id).top_role
            <= target.top_role
        ):
            await ctx.send(
                content=error(
                    "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 ctx.send(
                    content=error("You cannot moderate members with an immune role!"),
                    ephemeral=True,
                )
                return False

    return True


async def log(ctx: commands.Context, moderation_id: int, resolved: bool = False) -> None:
    """This function sends a message to the guild's configured logging channel when an infraction takes place."""
    from ..models.moderation import Moderation
    from .factory import log_factory

    logging_channel_id = await config.guild(ctx.guild).log_channel()
    if logging_channel_id != " ":
        logging_channel = ctx.guild.get_channel(logging_channel_id)

        try:
            moderation = await Moderation.find_by_id(ctx.bot, moderation_id, ctx.guild.id)
            embed = await log_factory(
                ctx=ctx, moderation=moderation, resolved=resolved
            )
            try:
                await logging_channel.send(embed=embed)
            except Forbidden:
                return
        except ValueError:
            return


async def send_evidenceformat(ctx: commands.Context, moderation_id: int) -> None:
    """This function sends an ephemeral message to the moderator who took the moderation action, with a pre-made codeblock for use in the mod-evidence channel."""
    from ..models.moderation import Moderation
    from .factory import evidenceformat_factory

    send_evidence_bool = (
        await config.user(ctx.author).auto_evidenceformat()
        or await config.guild(guild=ctx.guild).auto_evidenceformat()
        or False
    )
    if send_evidence_bool is True:
        moderation = await Moderation.find_by_id(ctx.bot, moderation_id, ctx.guild.id)
        content = await evidenceformat_factory(moderation=moderation)
        if not ctx.interaction:
            await ctx.author.send(content=content)
        else:
            await ctx.send(content=content, ephemeral=True)


def get_bool_emoji(value: Optional[bool]) -> str:
    """Returns a unicode emoji based on a boolean value."""
    match value:
        case True:
            return "\N{WHITE HEAVY CHECK MARK}"
        case False:
            return "\N{NO ENTRY SIGN}"
        case _:
            return "\N{BLACK QUESTION MARK ORNAMENT}\N{VARIATION SELECTOR-16}"


def get_pagesize_str(value: Union[int, None]) -> str:
    """Returns a string based on a pagesize value."""
    if value is None:
        return "\N{BLACK QUESTION MARK ORNAMENT}\N{VARIATION SELECTOR-16}"
    return str(value) + " cases per page"


def create_pagesize_options() -> list[SelectOption]:
    """Returns a list of SelectOptions for pagesize configuration."""
    options = []
    options.append(
        SelectOption(
            label="Default",
            value="default",
            description="Reset the pagesize to the default value.",
        )
    )
    for i in range(1, 21):
        options.append(
            SelectOption(
                label=str(i),
                value=str(i),
                description=f"Set the pagesize to {i}.",
            )
        )
    return options

def timedelta_from_relativedelta(relativedelta: rd) -> timedelta:
    """Converts a relativedelta object to a timedelta object."""
    now = datetime.now()
    then = now - relativedelta
    return now - then

def timedelta_from_string(string: str) -> timedelta:
    """Converts a string to a timedelta object."""
    hours, minutes, seconds = map(int, string.split(":"))
    return timedelta(hours=hours, minutes=minutes, seconds=seconds)

def timedelta_to_string(td: timedelta) -> str:
    """Converts a timedelta object to a string."""
    days = td.days * 24
    hours, remainder = divmod(td.seconds, 3600)
    minutes, seconds = divmod(remainder, 60)
    return f"{days + hours}:{minutes:02}:{seconds:02}"

def get_footer_image(coginstance: commands.Cog) -> File:
    """Returns the footer image for the embeds."""
    image_path = data_manager.bundled_data_path(coginstance) / "arrow.png"
    return File(image_path, filename="arrow.png", description="arrow")

async def create_guild_table(guild: Guild) -> None:
    from ..models.moderation import Moderation

    try:
        await Moderation.execute(f"SELECT * FROM `moderation_{guild.id}`", return_obj=False)
        logger.trace("SQLite Table exists for server %s (%s)", guild.name, guild.id)

    except aiosqlite.OperationalError:
        query = f"""
            CREATE TABLE `moderation_{guild.id}` (
                moderation_id INTEGER PRIMARY KEY NOT NULL,
                timestamp INTEGER NOT NULL,
                moderation_type TEXT NOT NULL,
                target_type TEXT NOT NULL,
                target_id INTEGER NOT NULL,
                moderator_id INTEGER NOT NULL,
                role_id INTEGER,
                duration TEXT,
                end_timestamp INTEGER,
                reason TEXT,
                resolved INTEGER NOT NULL,
                resolved_by TEXT,
                resolve_reason TEXT,
                expired INTEGER NOT NULL,
                changes JSON NOT NULL,
                metadata JSON NOT NULL
            )
        """
        await Moderation.execute(query=query, return_obj=False)

        index_query_1 = f"CREATE INDEX IF NOT EXISTS idx_target_id ON moderation_{guild.id}(target_id);"
        await Moderation.execute(query=index_query_1, return_obj=False)

        index_query_2 = f"CREATE INDEX IF NOT EXISTS idx_moderator_id ON moderation_{guild.id}(moderator_id);"
        await Moderation.execute(query=index_query_2, return_obj=False)

        index_query_3 = f"CREATE INDEX IF NOT EXISTS idx_moderation_id ON moderation_{guild.id}(moderation_id);"
        await Moderation.execute(query=index_query_3, return_obj=False)

        insert_query = f"""
            INSERT INTO `moderation_{guild.id}`
            (moderation_id, timestamp, moderation_type, target_type, target_id, moderator_id, role_id, duration, end_timestamp, reason, resolved, resolved_by, resolve_reason, expired, changes, metadata)
            VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)
        """
        insert_values = (
            0,
            0,
            "NULL",
            "NULL",
            0,
            0,
            None,
            None,
            None,
            None,
            0,
            None,
            None,
            0,
            dumps([]),
            dumps({}),
        )
        await Moderation.execute(query=insert_query, parameters=insert_values, return_obj=False)

        logger.trace("SQLite Table created for server %s (%s)", guild.name, guild.id)