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use crate::{
    client::Client,
    error::Error,
    request::{self, AuditLogReason, Request, TryIntoRequest},
    response::ResponseFuture,
    routing::Route,
};
use twilight_model::{
    channel::Channel,
    id::{marker::ChannelMarker, Id},
};
use twilight_validate::request::{audit_reason as validate_audit_reason, ValidationError};

/// Delete a channel by ID.
#[must_use = "requests must be configured and executed"]
pub struct DeleteChannel<'a> {
    channel_id: Id<ChannelMarker>,
    http: &'a Client,
    reason: Option<&'a str>,
}

impl<'a> DeleteChannel<'a> {
    pub(crate) const fn new(http: &'a Client, channel_id: Id<ChannelMarker>) -> Self {
        Self {
            channel_id,
            http,
            reason: None,
        }
    }

    /// Execute the request, returning a future resolving to a [`Response`].
    ///
    /// [`Response`]: crate::response::Response
    pub fn exec(self) -> ResponseFuture<Channel> {
        let http = self.http;

        match self.try_into_request() {
            Ok(request) => http.request(request),
            Err(source) => ResponseFuture::error(source),
        }
    }
}

impl<'a> AuditLogReason<'a> for DeleteChannel<'a> {
    fn reason(mut self, reason: &'a str) -> Result<Self, ValidationError> {
        validate_audit_reason(reason)?;

        self.reason.replace(reason);

        Ok(self)
    }
}

impl TryIntoRequest for DeleteChannel<'_> {
    fn try_into_request(self) -> Result<Request, Error> {
        let mut request = Request::builder(&Route::DeleteChannel {
            channel_id: self.channel_id.get(),
        });

        if let Some(reason) = &self.reason {
            let header = request::audit_header(reason)?;

            request = request.headers(header);
        }

        Ok(request.build())
    }
}