use internal::prelude::*;
use model::{
    guild::Role,
    Permissions
};
use utils::VecMap;

/// A builder to create or edit a [`Role`] for use via a number of model methods.
///
/// These are:
///
/// - [`PartialGuild::create_role`]
/// - [`Guild::create_role`]
/// - [`Guild::edit_role`]
/// - [`GuildId::create_role`]
/// - [`GuildId::edit_role`]
/// - [`Role::edit`]
///
/// Defaults are provided for each parameter on role creation.
///
/// # Examples
///
/// Create a hoisted, mentionable role named `"a test role"`:
///
/// ```rust,no_run
/// # use serenity::model::id::{ChannelId, GuildId};
/// # let (channel_id, guild_id) = (ChannelId(1), GuildId(2));
/// #
/// // assuming a `channel_id` and `guild_id` has been bound
///
/// let role = guild_id.create_role(|r| r
///     .hoist(true)
///     .mentionable(true)
///     .name("a test role"));
/// ```
///
/// [`PartialGuild::create_role`]: ../model/guild/struct.PartialGuild.html#method.create_role
/// [`Guild::create_role`]: ../model/guild/struct.Guild.html#method.create_role
/// [`Guild::edit_role`]: ../model/guild/struct.Guild.html#method.edit_role
/// [`GuildId::create_role`]: ../model/id/struct.GuildId.html#method.create_role
/// [`GuildId::edit_role`]: ../model/id/struct.GuildId.html#method.edit_role
/// [`Role`]: ../model/guild/struct.Role.html
/// [`Role::edit`]: ../model/guild/struct.Role.html#method.edit
#[derive(Clone, Debug, Default)]
pub struct EditRole(pub VecMap<&'static str, Value>);

impl EditRole {
    /// Creates a new builder with the values of the given [`Role`].
    ///
    /// [`Role`]: ../model/guild/struct.Role.html
    pub fn new(role: &Role) -> Self {
        let mut map = VecMap::with_capacity(8);

        #[cfg(feature = "utils")]
        {
            map.insert("color", Value::Number(Number::from(role.colour.0)));
        }

        #[cfg(not(feature = "utils"))]
        {
            map.insert("color", Value::Number(Number::from(role.colour)));
        }

        map.insert("hoist", Value::Bool(role.hoist));
        map.insert("managed", Value::Bool(role.managed));
        map.insert("mentionable", Value::Bool(role.mentionable));
        map.insert("name", Value::String(role.name.clone()));
        map.insert("permissions",Value::Number(Number::from(role.permissions.bits())));
        map.insert("position", Value::Number(Number::from(role.position)));

        EditRole(map)
    }

    /// Sets the colour of the role.
    pub fn colour(mut self, colour: u64) -> Self {
        self.0.insert("color", Value::Number(Number::from(colour)));

        self
    }

    /// Whether or not to hoist the role above lower-positioned role in the user
    /// list.
    pub fn hoist(mut self, hoist: bool) -> Self {
        self.0.insert("hoist", Value::Bool(hoist));

        self
    }

    /// Whether or not to make the role mentionable, notifying its users.
    pub fn mentionable(mut self, mentionable: bool) -> Self {
        self.0.insert("mentionable", Value::Bool(mentionable));

        self
    }

    /// The name of the role to set.
    pub fn name(mut self, name: &str) -> Self {
        self.0
            .insert("name", Value::String(name.to_string()));

        self
    }

    /// The set of permissions to assign the role.
    pub fn permissions(mut self, permissions: Permissions) -> Self {
        self.0.insert("permissions", Value::Number(Number::from(permissions.bits())));

        self
    }

    /// The position to assign the role in the role list. This correlates to the
    /// role's position in the user list.
    pub fn position(mut self, position: u8) -> Self {
        self.0.insert("position", Value::Number(Number::from(position)));

        self
    }
}