export const RequiresClientPermissions = (...permissionsResolvable: PermissionResolvable[]): MethodDecorator => {
    const resolved = new PermissionsBitField(permissionsResolvable);
    const resolvedIncludesServerPermissions = Boolean(resolved.bitfield & DMAvailablePermissions.bitfield);

    return createFunctionPrecondition((context: Message | BaseInteraction) => {
        if (context instanceof Message) {
            if (resolvedIncludesServerPermissions && isDMChannel(context.channel)) {
                throw new UserError({
                    identifier: DecoratorIdentifiers.RequiresClientPermissionsGuildOnly,
                    message: 'Sorry, but that command can only be used in a server because I do not have sufficient permissions in DMs'
                });
            }

            if (isGuildBasedChannel(context.channel)) {
                const missingPermissions = context.channel.permissionsFor(context.guild!.members.me!).missing(resolved);

                if (missingPermissions.length) {
                    throw new UserError({
                        identifier: DecoratorIdentifiers.RequiresClientPermissionsMissingPermissions,
                        message: `Sorry, but I am not allowed to do that. I am missing the permissions: ${missingPermissions}`,
                        context: {
                            missing: missingPermissions
                        }
                    });
                }
            }
        } else {
            if (resolvedIncludesServerPermissions && isDMChannel(context.channel)) {
                throw new UserError({
                    identifier: DecoratorIdentifiers.RequiresClientPermissionsGuildOnly,
                    message: 'Sorry, but that command can only be used in a server because I do not have sufficient permissions in DMs'
                });
            }

            if (context.channel && isGuildBasedChannel(context.channel)) {
                const missingPermissions = context.channel.permissionsFor(context.guild!.members.me!).missing(resolved);

                if (missingPermissions.length) {
                    throw new UserError({
                        identifier: DecoratorIdentifiers.RequiresClientPermissionsMissingPermissions,
                        message: `Sorry, but I am not allowed to do that. I am missing the permissions: ${missingPermissions}`,
                        context: {
                            missing: missingPermissions
                        }
                    });
                }
            }
        }

        return true;
    });
};

export const RequiresClientPermissions = (...permissionsResolvable: PermissionResolvable[]): MethodDecorator => {
    const resolved = new PermissionsBitField(permissionsResolvable);
    const resolvedIncludesServerPermissions = Boolean(resolved.bitfield & DMAvailablePermissions.bitfield);

    return createFunctionPrecondition((context: Message | BaseInteraction) => {
        if (context instanceof Message) {
            if (resolvedIncludesServerPermissions && isDMChannel(context.channel)) {
                throw new UserError({
                    identifier: DecoratorIdentifiers.RequiresClientPermissionsGuildOnly,
                    message: 'Sorry, but that command can only be used in a server because I do not have sufficient permissions in DMs'
                });
            }

            if (isGuildBasedChannel(context.channel)) {
                const missingPermissions = context.channel.permissionsFor(context.guild!.members.me!).missing(resolved);

                if (missingPermissions.length) {
                    throw new UserError({
                        identifier: DecoratorIdentifiers.RequiresClientPermissionsMissingPermissions,
                        message: `Sorry, but I am not allowed to do that. I am missing the permissions: ${missingPermissions}`,
                        context: {
                            missing: missingPermissions
                        }
                    });
                }
            }
        } else {
            if (resolvedIncludesServerPermissions && isDMChannel(context.channel)) {
                throw new UserError({
                    identifier: DecoratorIdentifiers.RequiresClientPermissionsGuildOnly,
                    message: 'Sorry, but that command can only be used in a server because I do not have sufficient permissions in DMs'
                });
            }

            if (context.channel && isGuildBasedChannel(context.channel)) {
                const missingPermissions = context.channel.permissionsFor(context.guild!.members.me!).missing(resolved);

                if (missingPermissions.length) {
                    throw new UserError({
                        identifier: DecoratorIdentifiers.RequiresClientPermissionsMissingPermissions,
                        message: `Sorry, but I am not allowed to do that. I am missing the permissions: ${missingPermissions}`,
                        context: {
                            missing: missingPermissions
                        }
                    });
                }
            }
        }

        return true;
    });
};