use revolt_database::{
    util::{permissions::DatabasePermissionQuery, reference::Reference}, voice::{delete_voice_state, get_channel_node, get_voice_channel_members, VoiceClient}, Channel, Database, PartialChannel, User, AMQP
};
use revolt_models::v0;
use revolt_permissions::{calculate_channel_permissions, ChannelPermission};
use revolt_result::{create_error, Result};
use rocket::State;
use rocket_empty::EmptyResponse;

/// # Close Channel
///
/// Deletes a server channel, leaves a group or closes a group.
#[openapi(tag = "Channel Information")]
#[delete("/<target>?<options..>")]
pub async fn delete(
    db: &State<Database>,
    voice_client: &State<VoiceClient>,
    amqp: &State<AMQP>,
    user: User,
    target: Reference,
    options: v0::OptionsChannelDelete,
) -> Result<EmptyResponse> {
    let mut channel = target.as_channel(db).await?;
    let mut query = DatabasePermissionQuery::new(db, &user).channel(&channel);
    let permissions = calculate_channel_permissions(&mut query).await;

    permissions.throw_if_lacking_channel_permission(ChannelPermission::ViewChannel)?;

    match &channel {
        Channel::SavedMessages { .. } => Err(create_error!(NoEffect))?,
        Channel::DirectMessage { .. } => channel
            .update(
                db,
                PartialChannel {
                    active: Some(false),
                    ..Default::default()
                },
                vec![],
            )
            .await?,
        Channel::Group { .. } => channel
            .remove_user_from_group(
                db,
                amqp,
                &user,
                None,
                options.leave_silently.unwrap_or_default(),
            )
            .await?,
        Channel::TextChannel { .. } | Channel::VoiceChannel { .. } => {
            permissions.throw_if_lacking_channel_permission(ChannelPermission::ManageChannel)?;
            channel.delete(db).await?
        }
    };

    if let Some(users) = get_voice_channel_members(channel.id()).await? {
        let node = get_channel_node(channel.id()).await?;

        for user in users {
            voice_client.remove_user(&node, &user, channel.id()).await?;
            delete_voice_state(channel.id(), channel.server(), &user).await?;
        }
    };

    Ok(EmptyResponse)
}

#[cfg(test)]
mod test {
    use crate::{rocket, util::test::TestHarness};
    use revolt_database::{events::client::EventV1, Channel};
    use revolt_models::v0::DataCreateGroup;
    use rocket::http::{Header, Status};

    #[rocket::async_test]
    async fn success_delete_group() {
        let mut harness = TestHarness::new().await;
        let (_, session, user) = harness.new_user().await;

        let group = Channel::create_group(
            &harness.db,
            DataCreateGroup {
                ..Default::default()
            },
            user.id.clone(),
        )
        .await
        .expect("`Channel`");

        let response = harness
            .client
            .delete(format!("/channels/{}", group.id()))
            .header(Header::new("x-session-token", session.token.to_string()))
            .dispatch()
            .await;

        assert_eq!(response.status(), Status::NoContent);
        drop(response);

        harness
            .wait_for_event(group.id(), |event| match event {
                EventV1::ChannelDelete { id, .. } => id == group.id(),
                _ => false,
            })
            .await;
    }

    // TEST: member leaves group (no delete)
    // TEST: no effect with saved messages
    // TEST: DM set to inactive
    // TEST: server channel deleted
}