use crate::model::user::User;
use chrono::Datelike;
use serde::Serialize;
use sqlx::{FromRow, Row, SqlitePool};

#[derive(FromRow, Serialize, Clone)]
pub struct Stat {
    name: String,
    rowed_km: i32,
}

impl Stat {
    pub async fn boats(db: &SqlitePool, year: Option<i32>) -> Vec<Stat> {
        let year = match year {
            Some(year) => year,
            None => chrono::Utc::now().year(),
        };
        //TODO: switch to query! macro again (once upgraded to sqlite 3.42 on server)
        sqlx::query(&format!(
            "
SELECT (SELECT name FROM boat WHERE id=logbook.boat_id) as name, CAST(SUM(distance_in_km) AS INTEGER) AS rowed_km
FROM logbook 
WHERE arrival LIKE '{year}-%'
GROUP BY boat_id 
ORDER BY rowed_km DESC;
")
        )
        .fetch_all(db)
        .await
        .unwrap()
        .into_iter()
        .map(|row| Stat {
            name: row.get("name"),
            rowed_km: row.get("rowed_km"),
        })
        .collect()
    }

    pub async fn guest(db: &SqlitePool, year: Option<i32>) -> Stat {
        let year = match year {
            Some(year) => year,
            None => chrono::Utc::now().year(),
        };
        //TODO: switch to query! macro again (once upgraded to sqlite 3.42 on server)
        let rowed_km = sqlx::query(&format!(
            "
SELECT SUM((b.amount_seats - COALESCE(m.member_count, 0)) * l.distance_in_km) as total_guest_km
FROM logbook l
JOIN boat b ON l.boat_id = b.id
LEFT JOIN (
    SELECT logbook_id, COUNT(*) as member_count
    FROM rower
    GROUP BY logbook_id
) m ON l.id = m.logbook_id
WHERE l.distance_in_km IS NOT NULL AND l.arrival LIKE '{year}-%' AND b.name != 'Externes Boot';
"
        ))
        .fetch_one(db)
        .await
        .unwrap()
        .get::<i64, usize>(0) as i32;

        let rowed_km_guests = sqlx::query(&format!(
            "
SELECT CAST(SUM(l.distance_in_km) AS INTEGER) AS rowed_km 
FROM user u
INNER JOIN rower r ON u.id = r.rower_id
INNER JOIN logbook l ON r.logbook_id = l.id
INNER JOIN user_role ur ON u.id = ur.user_id
INNER JOIN role ro ON ur.role_id = ro.id
WHERE ro.name = 'scheckbuch' AND l.distance_in_km IS NOT NULL AND l.arrival LIKE '{year}-%';
"
        ))
        .fetch_one(db)
        .await
        .unwrap()
        .get::<i64, usize>(0) as i32;

        Stat {
            name: "Gäste".into(),
            rowed_km: rowed_km + rowed_km_guests,
        }
    }

    pub async fn people(db: &SqlitePool, year: Option<i32>) -> Vec<Stat> {
        let year = match year {
            Some(year) => year,
            None => chrono::Utc::now().year(),
        };
        //TODO: switch to query! macro again (once upgraded to sqlite 3.42 on server)
        sqlx::query(&format!(
            "
SELECT u.name, CAST(SUM(l.distance_in_km) AS INTEGER) AS rowed_km 
FROM (
    SELECT * FROM user 
    WHERE id NOT IN (
        SELECT user_id FROM user_role 
        JOIN role ON user_role.role_id = role.id 
        WHERE role.name = 'scheckbuch'
    )
) u
INNER JOIN rower r ON u.id = r.rower_id
INNER JOIN logbook l ON r.logbook_id = l.id
WHERE l.distance_in_km IS NOT NULL AND l.arrival LIKE '{year}-%'
GROUP BY u.name
ORDER BY rowed_km DESC;
"
        ))
        .fetch_all(db)
        .await
        .unwrap()
        .into_iter()
        .map(|row| Stat {
            name: row.get("name"),
            rowed_km: row.get("rowed_km"),
        })
        .collect()
    }
}

#[derive(Debug, Serialize)]
pub struct PersonalStat {
    date: String,
    km: i32,
}

pub async fn get_personal(db: &SqlitePool, user: &User) -> Vec<PersonalStat> {
    sqlx::query(&format!(
        "
SELECT 
    departure_date as date,
    SUM(total_distance) OVER (ORDER BY departure_date) as km 
FROM (
    SELECT 
        date(l.departure) as departure_date,
        COALESCE(SUM(l.distance_in_km),0) as total_distance
    FROM 
        logbook l
    LEFT JOIN 
        rower r ON l.id = r.logbook_id
    WHERE 
        l.shipmaster = {0} OR r.rower_id = {0}
    GROUP BY 
        departure_date
) as subquery
ORDER BY 
    departure_date;
",
        user.id
    ))
    .fetch_all(db)
    .await
    .unwrap()
    .into_iter()
    .map(|row| PersonalStat {
        date: row.get("date"),
        km: row.get("km"),
    })
    .collect()
}