use chrono::NaiveDateTime;
use sqlx::{
    postgres::{PgHasArrayType, PgTypeInfo},
    query, PgPool,
};

use crate::utils::ApplicationError;

use super::Function;

pub struct ExportEventRow {
    pub start_timestamp: NaiveDateTime,
    pub end_timestamp: NaiveDateTime,
    pub amount_of_posten: i16,
    pub voluntary_fuehrungsassistent: bool,
    pub voluntary_wachhabender: bool,
    pub location_name: String,
    pub event_name: String,
    pub assignments: Vec<SimpleAssignment>,
    pub vehicles: Vec<String>,
}

#[derive(Debug, sqlx::Type)]
#[sqlx(type_name = "function", no_pg_array)]
pub struct SimpleAssignment {
    pub name: String,
    pub function: Function,
}

impl PgHasArrayType for SimpleAssignment {
    fn array_type_info() -> sqlx::postgres::PgTypeInfo {
        PgTypeInfo::with_name("simpleAssignment[]")
    }
}

impl ExportEventRow {
    pub async fn read(pool: &PgPool) -> Result<Vec<ExportEventRow>, ApplicationError> {
        let rows = query!(
            "select
	event.starttimestamp,
	event.endtimestamp,
	event.amountofposten,
        event.voluntaryfuehrungsassistent,
        event.voluntarywachhabender,
	location.name as locationName,
	event.name as eventName,
	array (
	select
		row (user_.name, assignment.function) ::simpleAssignment
	from
		assignment
	join availability on
		assignment.availabilityid = availability.id
	join user_ on
		availability.userid = user_.id
	where
		assignment.eventId = event.id) as \"assignments: Vec<SimpleAssignment>\",
		array (
	select
		vehicle.station || ' ' || vehicle.radiocallname
	from
		vehicleassignment
	join vehicle on
		vehicleassignment.vehicleId = vehicle.id
	where
		vehicleassignment.eventId = event.id) as vehicles
from
	event
join location on
	event.locationId = location.id
        order by event.starttimestamp"
        )
        .fetch_all(pool)
        .await?;

        let export_rows = rows
            .into_iter()
            .map(|r| ExportEventRow {
                start_timestamp: r.starttimestamp.naive_utc(),
                end_timestamp: r.endtimestamp.naive_utc(),
                amount_of_posten: r.amountofposten,
                voluntary_fuehrungsassistent: r.voluntaryfuehrungsassistent,
                voluntary_wachhabender: r.voluntarywachhabender,
                location_name: r.locationname,
                event_name: r.eventname,
                assignments: r.assignments.unwrap_or(Vec::new()),
                vehicles: r.vehicles.unwrap_or(Vec::new()),
            })
            .collect();

        Ok(export_rows)
    }
}