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use crate::{
    client::Client,
    error::Error,
    request::{self, AuditLogReason, AuditLogReasonError, Pending, Request},
    routing::Route,
};
use serde::Serialize;
use twilight_model::{
    guild::Emoji,
    id::{EmojiId, GuildId, RoleId},
};

#[derive(Default, Serialize)]
struct UpdateEmojiFields {
    #[serde(skip_serializing_if = "Option::is_none")]
    name: Option<String>,
    #[serde(skip_serializing_if = "Option::is_none")]
    roles: Option<Vec<RoleId>>,
}

/// Update an emoji in a guild, by id.
pub struct UpdateEmoji<'a> {
    emoji_id: EmojiId,
    fields: UpdateEmojiFields,
    fut: Option<Pending<'a, Emoji>>,
    guild_id: GuildId,
    http: &'a Client,
    reason: Option<String>,
}

impl<'a> UpdateEmoji<'a> {
    pub(crate) fn new(http: &'a Client, guild_id: GuildId, emoji_id: EmojiId) -> Self {
        Self {
            fields: UpdateEmojiFields::default(),
            emoji_id,
            fut: None,
            guild_id,
            http,
            reason: None,
        }
    }

    /// Change the name of the emoji.
    pub fn name(mut self, name: impl Into<String>) -> Self {
        self.fields.name.replace(name.into());

        self
    }

    /// Change the roles that the emoji is whitelisted to.
    pub fn roles(mut self, roles: Vec<RoleId>) -> Self {
        self.fields.roles.replace(roles);

        self
    }

    fn start(&mut self) -> Result<(), Error> {
        let mut request = Request::builder(Route::UpdateEmoji {
            emoji_id: self.emoji_id.0,
            guild_id: self.guild_id.0,
        })
        .json(&self.fields)?;

        if let Some(reason) = self.reason.as_ref() {
            request = request.headers(request::audit_header(reason)?);
        }

        self.fut
            .replace(Box::pin(self.http.request(request.build())));

        Ok(())
    }
}

impl<'a> AuditLogReason for UpdateEmoji<'a> {
    fn reason(mut self, reason: impl Into<String>) -> Result<Self, AuditLogReasonError> {
        self.reason
            .replace(AuditLogReasonError::validate(reason.into())?);

        Ok(self)
    }
}

poll_req!(UpdateEmoji<'_>, Emoji);