use sqlx::SqlitePool;

use super::planned_event::PlannedEvent;

pub struct UserTrip {}

impl UserTrip {
    pub async fn create(
        db: &SqlitePool,
        user_id: i64,
        trip_details_id: i64,
    ) -> Result<(), UserTripError> {
        if PlannedEvent::is_full(db, trip_details_id).await {
            return Err(UserTripError::EventAlreadyFull);
        }

        //check if cox if own event
        let is_cox = sqlx::query!(
            "SELECT count(*) as amount
            FROM trip 
            WHERE trip_details_id = ? 
            AND cox_id = ?",
            trip_details_id,
            user_id
        )
        .fetch_one(db)
        .await
        .unwrap();
        if is_cox.amount > 0 {
            return Err(UserTripError::AlreadyRegisteredAsCox);
        }

        //check if cox if planned_event
        let is_cox = sqlx::query!(
            "SELECT count(*) as amount
            FROM trip 
            WHERE planned_event_id = (
                SELECT id FROM planned_event WHERE trip_details_id = ?
            ) 
            AND cox_id = ?",
            trip_details_id,
            user_id
        )
        .fetch_one(db)
        .await
        .unwrap();
        if is_cox.amount > 0 {
            return Err(UserTripError::AlreadyRegisteredAsCox);
        }

        match sqlx::query!(
            "INSERT INTO user_trip (user_id, trip_details_id) VALUES(?, ?)",
            user_id,
            trip_details_id
        )
        .execute(db)
        .await
        {
            Ok(_) => Ok(()),
            Err(_) => Err(UserTripError::AlreadyRegistered),
        }
    }

    pub async fn delete(db: &SqlitePool, user_id: i64, trip_details_id: i64) {
        //TODO: Check if > 2 hrs to event
        let _ = sqlx::query!(
            "DELETE FROM user_trip WHERE user_id = ? AND trip_details_id = ?",
            user_id,
            trip_details_id
        )
        .execute(db)
        .await
        .is_ok();
    }
}

pub enum UserTripError {
    AlreadyRegistered,
    AlreadyRegisteredAsCox,
    EventAlreadyFull,
}