use std::collections::HashMap;

use sqlx::FromRow;

use super::{prelude::*, util::PartyError};

api_routes!();

#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema)]
#[serde(crate = "rocket::serde")]
pub struct EventOutcome {
    points: HashMap<i64, i64>,
}

#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema, FromRow)]
#[serde(crate = "rocket::serde")]
pub struct FreeForAllGame {}

#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema, FromRow)]
#[serde(crate = "rocket::serde")]
pub struct TeamGame {}

#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema, FromRow)]
#[serde(crate = "rocket::serde")]
pub struct Test {}

// # Event
//
// An event in which participants can win or lose points
#[derive(Clone, Debug, Serialize, Deserialize, JsonSchema)]
#[serde(crate = "rocket::serde")]
pub enum Event {
    FreeForAllGame(FreeForAllGame),
    TeamGame(TeamGame),
    Test(Test),
}

pub struct EventRecord {
    id: i64,
    name: String,
    event_type: String,
    event_id: i64,
}

macro_rules! dispatch {
    ($event:ident) => {
        dispatch!($event,
            free_for_all_game => FreeForAllGame,
            team_game => TeamGame,
            test => Test,
        )
    };
    ($event:ident, $($event_type:ident => $event_struct:ident),* $(,)?) => {
        match $event.event_type.as_str() {
            $(stringify!($event_type) => dispatch_run!($event_type, $event_struct),)*
            _ => return Err(PartyError::Unknown("invalid event type".into())),
        }
    };
}

macro_rules! reverse_dispatch {
    ($event:ident) => {
        reverse_dispatch!($event,
            FreeForAllGame => free_for_all_game,
            TeamGame => team_game,
            Test => test,
        )
    };
    ($event:ident, $($event_struct:ident => $event_type:ident),* $(,)?) => {
        match $event {
            $(Event::$event_struct(e) => reverse_dispatch_run!($event_type, $event_struct, e),)*
        }
    };
}

impl EventRecord {
    pub async fn get(db: &mut Connection<Db>, id: i64) -> Result<Self, PartyError> {
        Ok(sqlx::query_as!(
            EventRecord,
            "SELECT id, name, event_type, event_id FROM events WHERE id = ?",
            id
        )
        .fetch_one(&mut **db)
        .await?)
    }

    pub async fn remove(&self, db: &mut Connection<Db>) -> Result<(), PartyError> {
        macro_rules! dispatch_run {
            ($event_type:ident, $event_struct:ident) => {{
                sqlx::query(&format!(
                    "DELETE FROM events_{} WHERE id = {}",
                    stringify!($event_type),
                    self.event_id
                ))
                .fetch_one(&mut **db)
                .await?;
            }};
        }

        dispatch!(self);

        sqlx::query!("DELETE FROM events WHERE id = ?", self.id)
            .execute(&mut **db)
            .await?;

        Ok(())
    }
}

impl Event {
    pub async fn register(
        &self,
        db: &mut Connection<Db>,
        name: String,
    ) -> Result<EventRecord, PartyError> {
        let event_id = match self {
            Self::FreeForAllGame(e) => {
                unimplemented!()
                /*
                sqlx::query!("INSERT INTO events_free_for_all_game () VALUES ()")
                    .execute(&mut **db)
                    .await?
                    .last_insert_rowid()
                    */
            }
            Self::TeamGame(e) => {
                unimplemented!()
                /*
                sqlx::query!("INSERT INTO events_team_game () VALUES ()")
                .execute(&mut **db)
                .await?
                .last_insert_rowid()
                    */
            }
            Self::Test(e) => sqlx::query!("INSERT INTO events_test () VALUES ()")
                .execute(&mut **db)
                .await?
                .last_insert_rowid(),
        };

        macro_rules! reverse_dispatch_run {
            ($event_type:ident, $event_struct:ident, $inner:ident) => {
                sqlx::query!(
                    "INSERT INTO events (name, event_type, event_id) VALUES (?, ?, ?)",
                    stringify!($event_type),
                    name,
                    event_id
                )
                .execute(&mut **db)
                .await?
            };
        }

        let id = reverse_dispatch!(self).last_insert_rowid();
        Ok(EventRecord::get(db, id).await?)
    }

    pub async fn get(db: &mut Connection<Db>, record: EventRecord) -> Result<Self, PartyError> {
        macro_rules! dispatch_run {
            ($event_type:ident, $event_struct:ident) => {
                Event::$event_struct(
                    sqlx::query_as::<_, $event_struct>(&format!(
                        "SELECT id, name, event_type, event_id FROM events_{} WHERE id = {}",
                        stringify!($event_type),
                        record.event_id
                    ))
                    .fetch_one(&mut **db)
                    .await?,
                )
            };
        }

        Ok(dispatch!(record))
    }
}

#[openapi(tag = "Event")]
#[post("/<id>/stop")]
pub fn stop_event(id: i64) -> Result<Json<EventOutcome>, PartyError> {
    todo!()
}