use axum::{
    extract::{Query, State},
    http::StatusCode,
    response::IntoResponse,
    Json,
};
use axum_auth::AuthBearer;
use serde_json::json;
use sqlx::{query, query_as};

use crate::{
    jwt::handle_token,
    models::{Event, EventType, EventWithConfirmed, GetEventQuery, NewEventRequestEntry, Role},
    AppState,
};

pub async fn get_events_preview(
    AuthBearer(token): AuthBearer,
    State(app_state): State<AppState>,
) -> impl IntoResponse {
    match handle_token(token, &app_state, Role::Student) {
        Ok(_) => {}
        Err(err) => return err,
    };

    let result = query_as!(
        Event,
        r#"
        SELECT
            id,
            title,
            description,
            time_start,
            time_end,
            event_type AS "event_type!: EventType",
            points,
            place,
            price,
            created_by
        FROM
            events
        WHERE
            time_start BETWEEN now() AND now() + interval '1 week'
        ORDER BY
            time_start
        LIMIT
            10;
        "#
    )
    .fetch_all(&app_state.db_pool)
    .await;

    match result {
        Ok(events) => (StatusCode::OK, Json(json!(events))),
        Err(err) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(json!({
                "error": format!("Unknown error getting events: {:?}", err)
            })),
        ),
    }
    .into_response()
}

pub async fn get_all_events(
    AuthBearer(token): AuthBearer,
    State(app_state): State<AppState>,
) -> impl IntoResponse {
    match handle_token(token, &app_state, Role::Student) {
        Ok(_) => {}
        Err(err) => return err,
    };

    let result = query_as!(
        Event,
        r#"
        SELECT
            id,
            title,
            description,
            time_start,
            time_end,
            event_type AS "event_type!: EventType",
            points,
            place,
            price,
            created_by
        FROM
            events
        WHERE
            time_start > now()
        ORDER BY
            time_start
        LIMIT
            100;
        "#
    )
    .fetch_all(&app_state.db_pool)
    .await;

    match result {
        Ok(events) => (StatusCode::OK, Json(json!(events))),
        Err(err) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(json!({
                "error": format!("Unknown error getting events: {:?}", err)
            })),
        ),
    }
    .into_response()
}

pub async fn get_recent_events(
    AuthBearer(token): AuthBearer,
    State(app_state): State<AppState>,
) -> impl IntoResponse {
    let token_data = match handle_token(token, &app_state, Role::Student) {
        Ok(token_data) => token_data,
        Err(err) => return err,
    };

    let result = query_as!(
        EventWithConfirmed,
        r#"
        SELECT 
            e.id,
            e.title,
            e.description,
            e.time_start,
            e.time_end,
            e.event_type AS "event_type!: EventType",
            e.points,
            e.place,
            e.price,
            e.created_by,
            ea.confirmed
        FROM events e
        INNER JOIN event_attendees ea
            ON ea.event_id = e.id
        WHERE
            ea.user_id = $1
        ;
        "#,
        token_data.id
    )
    .fetch_all(&app_state.db_pool)
    .await;

    match result {
        Ok(events) => (StatusCode::OK, Json(json!(events))),
        Err(err) => (
            StatusCode::INTERNAL_SERVER_ERROR,
            Json(json!({
                "error": format!("Unknown error getting events: {:?}", err)
            })),
        ),
    }
    .into_response()
}

pub async fn get_event(
    AuthBearer(token): AuthBearer,
    State(app_state): State<AppState>,
    Query(get_event_query): Query<GetEventQuery>,
) -> impl IntoResponse {
    match handle_token(token, &app_state, Role::Student) {
        Ok(_) => {}
        Err(err) => return err,
    };

    let result = query_as!(
        Event,
        r#"
            SELECT
                id,
                title,
                description,
                time_start,
                time_end,
                event_type AS "event_type!: EventType",
                points,
                place,
                price,
                created_by
            FROM
                events
            WHERE
                id = $1
        "#,
        get_event_query.id
    )
    .fetch_one(&app_state.db_pool)
    .await;

    match result {
        Ok(event) => (StatusCode::OK, Json(json!(event))),
        Err(err) => {
            if matches!(err, sqlx::Error::RowNotFound) {
                (
                    StatusCode::NOT_FOUND,
                    Json(json!({
                        "error": format!("Event {} not found.", get_event_query.id)
                    })),
                )
            } else {
                (
                    StatusCode::INTERNAL_SERVER_ERROR,
                    Json(json!({
                        "error": format!("Unknown error getting event: {:?}", err)
                    })),
                )
            }
        }
    }
    .into_response()
}

pub async fn create_event(
    AuthBearer(token): AuthBearer,
    State(app_state): State<AppState>,
    Json(event_req): Json<NewEventRequestEntry>,
) -> impl IntoResponse {
    let token_data = match handle_token(token, &app_state, Role::Teacher) {
        Ok(value) => value,
        Err(value) => return value,
    };

    let result = query!(
        r#"
            INSERT INTO events (title, description, time_start, time_end, event_type, points, place, price, created_by)
            VALUES ( $1, $2, $3, $4, $5, $6, $7, $8, $9 )
            RETURNING id
        "#,
        event_req.title,
        event_req.description,
        event_req.time_start,
        event_req.time_end,
        event_req.event_type as EventType,
        event_req.points,
        event_req.place,
        event_req.price,
        token_data.id,
    ).fetch_one(&app_state.db_pool).await;

    match result {
        Ok(record) => (StatusCode::OK, Json(json!({ "data": record.id }))).into_response(),
        Err(err) => (
            StatusCode::BAD_REQUEST,
            Json(json!({
                "error": format!("Unknown error creating event: {:?}", err)
            })),
        )
            .into_response(),
    }
}