use revolt_database::{util::reference::Reference, voice::{delete_voice_state, get_channel_node, is_in_voice_channel, VoiceClient}, Channel, Database, User, AMQP};
use revolt_permissions::ChannelPermission;
use revolt_result::{create_error, Result};

use rocket::State;
use rocket_empty::EmptyResponse;

/// # Remove Member from Group
///
/// Removes a user from the group.
#[openapi(tag = "Groups")]
#[delete("/<target>/recipients/<member>")]
pub async fn remove_member(
    db: &State<Database>,
    voice_client: &State<VoiceClient>,
    amqp: &State<AMQP>,
    user: User,
    target: Reference<'_>,
    member: Reference<'_>,
) -> Result<EmptyResponse> {
    if user.bot.is_some() {
        return Err(create_error!(IsBot));
    }

    let channel = target.as_channel(db).await?;

    if let Channel::Group { owner, recipients, .. } = &channel {
        if &user.id != owner {
            return Err(create_error!(MissingPermission {
                permission: ChannelPermission::ManageChannel.to_string()
            }));
        }

        let member = member.as_user(db).await?;
        if user.id == member.id {
            return Err(create_error!(CannotRemoveYourself));
        }

        if !recipients.contains(&member.id) {
            return Err(create_error!(NotInGroup));
        }

        channel
            .remove_user_from_group(db, amqp, &member, Some(&user.id), false)
            .await?;
    } else {
        return Err(create_error!(InvalidOperation))
    };

    if is_in_voice_channel(&user.id, channel.id()).await? {
        let node = get_channel_node(channel.id()).await?.unwrap();

        voice_client.remove_user(&node, &user.id, channel.id()).await?;
        delete_voice_state(channel.id(), None, &user.id).await?;
    };

    Ok(EmptyResponse)
}

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

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

        #[allow(clippy::disallowed_methods)]
        user.apply_relationship(
            &harness.db,
            &mut other_user,
            RelationshipStatus::Friend,
            RelationshipStatus::Friend,
        )
        .await
        .unwrap();

        let group = Channel::create_group(
            &harness.db,
            v0::DataCreateGroup {
                name: TestHarness::rand_string(),
                ..Default::default()
            },
            user.id.to_string(),
        )
        .await
        .unwrap();

        let response = harness
            .client
            .put(format!(
                "/channels/{}/recipients/{}",
                group.id(),
                other_user.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(&format!("{}!", other_user.id), |event| match event {
                EventV1::ChannelCreate(channel) => channel.id() == group.id(),
                _ => false,
            })
            .await;

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

        match event {
            EventV1::ChannelGroupJoin { user, .. } => assert_eq!(user, other_user.id),
            _ => unreachable!(),
        };

        let message = harness.wait_for_message(group.id()).await;

        assert_eq!(
            message.system,
            Some(v0::SystemMessage::UserAdded {
                id: other_user.id.to_string(),
                by: user.id.to_string()
            })
        );
    }

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

        let group = Channel::create_group(
            &harness.db,
            v0::DataCreateGroup {
                name: TestHarness::rand_string(),
                ..Default::default()
            },
            user.id.to_string(),
        )
        .await
        .unwrap();

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

        dbg!(response.into_string().await);
        // FIXME: finish impl
        // assert_eq!(response.status(), Status::NotFound);
    }

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

        let group = Channel::create_group(
            &harness.db,
            v0::DataCreateGroup {
                name: TestHarness::rand_string(),
                users: vec![&other_user.id, &user_to_be_kicked.id]
                    .into_iter()
                    .cloned()
                    .collect(),
                ..Default::default()
            },
            user.id.to_string(),
        )
        .await
        .unwrap();

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

        // FIXME: impl assert_eq!(response.status(), Status::Forbidden);
    }
}