use rocket::{
    form::Form,
    get, post,
    response::{Flash, Redirect},
    routes, FromForm, Route, State,
};
use sqlx::SqlitePool;

use crate::model::{
    log::Log,
    planned_event::PlannedEvent,
    trip::{CoxHelpError, Trip, TripDeleteError, TripUpdateError},
    tripdetails::TripDetails,
    user::CoxUser,
};

#[derive(FromForm)]
struct AddTripForm<'r> {
    day: String,
    //TODO: properly parse `planned_starting_time`
    planned_starting_time: &'r str,
    #[field(validate = range(1..))]
    max_people: i32,
    notes: Option<&'r str>,
    trip_type: Option<i64>,
    allow_guests: bool,
}

#[post("/trip", data = "<data>")]
async fn create(
    db: &State<SqlitePool>,
    data: Form<AddTripForm<'_>>,
    cox: CoxUser,
) -> Flash<Redirect> {
    let trip_details_id = TripDetails::create(
        db,
        data.planned_starting_time,
        data.max_people,
        &data.day,
        data.notes,
        data.allow_guests,
        data.trip_type,
    )
    .await;
    let trip_details = TripDetails::find_by_id(db, trip_details_id).await.unwrap(); //Okay, bc just
                                                                                    //created
    Trip::new_own(db, &cox, trip_details).await;

    Log::create(
        db,
        format!(
            "Cox {} created trip on {} @ {} for {} rower",
            cox.name, data.day, data.planned_starting_time, data.max_people,
        ),
    )
    .await;

    Flash::success(Redirect::to("/"), "Ausfahrt erfolgreich erstellt.")
}

#[derive(FromForm)]
struct EditTripForm<'r> {
    max_people: i32,
    notes: Option<&'r str>,
    trip_type: Option<i64>,
}

#[post("/trip/<trip_id>", data = "<data>")]
async fn update(
    db: &State<SqlitePool>,
    data: Form<EditTripForm<'_>>,
    trip_id: i64,
    cox: CoxUser,
) -> Flash<Redirect> {
    if let Some(trip) = Trip::find_by_id(db, trip_id).await {
        match Trip::update_own(db, &cox, &trip, data.max_people, data.notes, data.trip_type).await {
            Ok(_) => Flash::success(Redirect::to("/"), "Ausfahrt erfolgreich aktualisiert."),
            Err(TripUpdateError::NotYourTrip) => {
                Flash::error(Redirect::to("/"), "Nicht deine Ausfahrt!")
            }
            Err(TripUpdateError::TripDetailsDoesNotExist) => {
                Flash::error(Redirect::to("/"), "Ausfahrt gibt's nicht")
            }
        }
    } else {
        Flash::error(Redirect::to("/"), "Ausfahrt gibt's nicht")
    }
}

#[get("/join/<planned_event_id>")]
async fn join(db: &State<SqlitePool>, planned_event_id: i64, cox: CoxUser) -> Flash<Redirect> {
    if let Some(planned_event) = PlannedEvent::find_by_id(db, planned_event_id).await {
        match Trip::new_join(db, &cox, &planned_event).await {
            Ok(_) => {
                Log::create(
                    db,
                    format!(
                        "Cox {} helps at planned_event.id={}",
                        cox.name, planned_event_id,
                    ),
                )
                .await;
                Flash::success(Redirect::to("/"), "Danke für's helfen!")
            }
            Err(CoxHelpError::AlreadyRegisteredAsCox) => {
                Flash::error(Redirect::to("/"), "Du hilfst bereits aus!")
            }
            Err(CoxHelpError::AlreadyRegisteredAsRower) => Flash::error(
                Redirect::to("/"),
                "Du hast dich bereits als Ruderer angemeldet!",
            ),
        }
    } else {
        Flash::error(Redirect::to("/"), "Event gibt's nicht")
    }
}

#[get("/remove/trip/<trip_id>")]
async fn remove_trip(db: &State<SqlitePool>, trip_id: i64, cox: CoxUser) -> Flash<Redirect> {
    let trip = Trip::find_by_id(db, trip_id).await;
    match trip {
        None => Flash::error(Redirect::to("/"), "Trip gibt's nicht!"),
        Some(trip) => match trip.delete(db, &cox).await {
            Ok(_) => {
                Log::create(db, format!("Cox {} deleted trip.id={}", cox.name, trip_id)).await;
                Flash::success(Redirect::to("/"), "Erfolgreich gelöscht!")
            }
            Err(TripDeleteError::SomebodyAlreadyRegistered) => Flash::error(
                Redirect::to("/"),
                "Ausfahrt kann nicht gelöscht werden, da bereits jemand registriert ist!",
            ),
            Err(TripDeleteError::NotYourTrip) => {
                Flash::error(Redirect::to("/"), "Nicht deine Ausfahrt!")
            }
        },
    }
}

#[get("/remove/<planned_event_id>")]
async fn remove(db: &State<SqlitePool>, planned_event_id: i64, cox: CoxUser) -> Flash<Redirect> {
    if let Some(planned_event) = PlannedEvent::find_by_id(db, planned_event_id).await {
        Trip::delete_by_planned_event(db, &cox, &planned_event).await;

        Log::create(
            db,
            format!(
                "Cox {} deleted registration for planned_event.id={}",
                cox.name, planned_event_id
            ),
        )
        .await;

        Flash::success(Redirect::to("/"), "Erfolgreich abgemeldet!")
    } else {
        Flash::error(Redirect::to("/"), "Planned_event does not exist.")
    }
}

pub fn routes() -> Vec<Route> {
    routes![create, join, remove, remove_trip, update]
}