use pulldown_cmark::{Options, Parser};
use rocket::fairing::AdHoc;
use rocket::form::Form;
use rocket::http::CookieJar;
use rocket::response::Redirect;

use rocket_db_pools::{sqlx, Connection};
use rocket_dyn_templates::{context, Template};
use sqlx::{Acquire, Executor};
use crate::auth;
use crate::auth::User;
use crate::database::Db;
use crate::database_records::{DisplayTruth, Player, Truth, Week};

#[get("/<week_number>")]
pub async fn week(week_number: u8, mut db: Connection<Db>, cookies: &CookieJar<'_>) -> Template {
    let user: User = auth::get_user(week_number, &mut db, cookies).await;

    let other_players = if user.logged_in {
        match sqlx::query_as("SELECT id, name FROM Players WHERE id <> $1 AND is_admin == 0 ORDER BY name")
            .bind(user.id)
            .fetch_all(&mut **db).await {
            Ok(v) => v,
            Err(error) => {
                error!("Some error while getting players : {error}");
                Vec::<Player>::new()
            }
        }
    } else {
        Vec::<Player>::new()
    };

    let week_data: Week = match sqlx::query_as("SELECT number, is_last_week, rendered_text, raw_text FROM Weeks WHERE number == $1")
        .bind(week_number)
        .fetch_one(&mut **db)
        .await {
        Ok(week) => week,
        Err(error) => {
            error!("Error while retrieving week data : {error}");
            Week {number: 0, is_last_week: true, rendered_text: "".to_string(), raw_text: "".to_string() }
        }
    };

    // FIXME : This is fucking *trash* but fucking hell mate
    if user.is_admin {
        let truths: Vec<Truth> = match sqlx::query_as("SELECT * FROM Truths WHERE week == $1 ORDER BY number")
            .bind(week_number)
            .fetch_all(&mut **db).await {
            Ok(v) => v,
            Err(error) => {
                error!("Error while getting truths : {error}");
                Vec::<Truth>::new()
            }
        };

        Template::render("index", context! {
            week_data: week_data,
            truths: truths,
            user: user,
            other_players: other_players,
        })
    } else {
        let truths: Vec<DisplayTruth> = match sqlx::query_as("SELECT id, number, author_id, rendered_text FROM Truths WHERE week == $1 ORDER BY number")
            .bind(week_number)
            .fetch_all(&mut **db).await {
            Ok(v) => v,
            Err(error) => {
                error!("Error while getting truths : {error}");
                Vec::<DisplayTruth>::new()
            }
        };

        Template::render("index", context! {
            week_data: week_data,
            truths: truths,
            user: user,
            other_players: other_players,
        })
    }
}

#[post("/<week>/edit", data="<raw_intro>")]
pub async fn update_week(week: u8, raw_intro: Form<String>,
                              mut db: Connection<Db>, cookies: &CookieJar<'_>) -> Redirect {
    let user = auth::get_user(week, &mut db, cookies).await;
    if !user.is_admin {
        cookies.add(("toast_error", "Vous n'avez pas la permission de changer la semaine."));
        return Redirect::to(uri!(week(week)));
    }

    let mut options = Options::empty();
    options.insert(Options::ENABLE_STRIKETHROUGH);
    options.insert(Options::ENABLE_FOOTNOTES);
    options.insert(Options::ENABLE_MATH);
    options.insert(Options::ENABLE_TABLES);
    let markdown_parser = Parser::new_ext(raw_intro.as_str(), options);

    let mut rendered_markdown = String::new();
    pulldown_cmark::html::push_html(&mut rendered_markdown, markdown_parser);

    match sqlx::query("UPDATE Weeks SET raw_text = $1, rendered_text = $2 WHERE number == $3;")
        .bind(&raw_intro.as_str())
        .bind(rendered_markdown)
        .bind(week)
        .fetch_optional(&mut **db)
        .await {
        Ok(_) => {
            debug!("Week successfully updated")
        }
        Err(error) => {
            error!("Error while updating week {week} data : {error}");
            cookies.add(("toast_error", "Il y a eu un problème lors du changement de la semaine"));
        }
    };

    Redirect::to(uri!(week(week)))
}

#[post("/<week>/set_last")]
pub async fn set_last_week(week: u8, mut db: Connection<Db>, cookies: &CookieJar<'_>) -> Redirect {
    let user = auth::get_user(week, &mut db, cookies).await;
    if !user.is_admin {
        cookies.add(("toast_error", "Vous n'avez pas la permission de changer la semaine."));
        return Redirect::to(uri!(week(week)));
    }

    let add_error_cookie = ||
        cookies.add(("toast_error", "Erreur lors du changement d'état de la semaine."));

    let db_transaction_connection = db.begin().await;
    if db_transaction_connection.is_err() {
        error!("Could not start database transaction for last week change : {:?}", db_transaction_connection.unwrap_err());
        add_error_cookie();
        return Redirect::to(uri!(week(week)));
    }
    let mut db_transaction = db_transaction_connection.unwrap();

    // Remove the last flag from other weeks, if set.
    match db_transaction.execute("UPDATE Weeks SET is_last_week = 0 WHERE is_last_week == 1;")
        .await {
        Ok(_) => debug!("Succesfully cleared is_last_week"),
        Err(error) => {
            error!("Failed to clear last week status : {error}");
            add_error_cookie();
            return Redirect::to(uri!(week(week)));
        }
    };

    // We should set one week, if not there's something wrong : rollback.
    if match sqlx::query("UPDATE Weeks SET is_last_week = 1 WHERE number == $1;")
        .bind(week)
        .execute(&mut *db_transaction)
        .await {
            Ok(result) => result.rows_affected(),
            Err(error) => {
                error!("Error while setting last week status : {error}");
                0
            }
    } == 1 {
        db_transaction.commit().await.unwrap_or_else(|error| {
            error!("Error while committing week is last transaction : {error}");
            add_error_cookie();
        })
    } else {
        db_transaction.rollback().await.unwrap_or_else(|error| {
            error!("Error while rolling back week is last transaction : {error}");
            add_error_cookie();
        })
    }

    Redirect::to(uri!(week(week)))
}

#[get("/<week>/create")]
pub async fn create_week(week: u8, mut db: Connection<Db>, cookies: &CookieJar<'_>) -> Redirect {
    let user = auth::get_user(week, &mut db, cookies).await;
    if !user.is_admin {
        cookies.add(("toast_error", "Vous n'avez pas la permission de changer la semaine."));
        return Redirect::to(uri!(week(week - 1)));
    }

    let week_check: Result<Option<u8>, sqlx::Error> = sqlx::query_scalar("SELECT number from Weeks WHERE number == $1;")
        .bind(week)
        .fetch_optional(&mut **db)
        .await;

    if week_check.is_err() {
        error!("Error while checking week existence : {:?}", week_check.unwrap_err());
        cookies.add(("toast_error", "Erreur en vérifiant que la semaine n'existe pas déjà"));
        return Redirect::to(uri!(week(week - 1)));
    }

    if week_check.unwrap().is_some() {
        debug!("Week {week} already exists, not creating.");
        return Redirect::to(uri!(week(week)));
    }

    match sqlx::query("INSERT INTO Weeks (number, is_last_week, rendered_text, raw_text) VALUES ($1, 0, \"\", \"\");")
        .bind(week)
        .execute(&mut **db)
        .await {
            Ok(_) => {
                debug!("Succesfully created new week {week}");
                Redirect::to(uri!(week(week)))
            },
            Err(error) => {
                error!("Error while creating new week {week} : {error}");
                cookies.add(("toast_error", "Erreur en créant la nouvelle selmaine."));
                Redirect::to(uri!(week(week - 1)))
            }
    }
}

pub fn stage() -> AdHoc {
    AdHoc::on_ignite("Week stage", |rocket| async {
        rocket.mount("/", routes![week, create_week, update_week, set_last_week])
    })
}