use rocket::form::Form;
use rocket::http::CookieJar;
use rocket::response::Redirect;

use rocket_db_pools::{sqlx, Connection};

use pulldown_cmark::{Parser, Options};
use sqlx::Row;
use crate::{auth, database, week};

#[derive(FromForm)]
pub struct TruthUpdateForm {
    truth_raw_text: String,
    truth_author: u8,
}

#[post("/<week>/edit/<truth_number>", data="<form>")]
pub async fn edit_truth(week: u8, truth_number: u8, form: Form<TruthUpdateForm>,
                        mut db: Connection<database::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 vérité."));
        return Redirect::to(uri!(week::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(form.truth_raw_text.as_str(), options);

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

    match sqlx::query("UPDATE Truths SET raw_text = $1, rendered_text = $2, author_id = $3 WHERE week == $4 AND number == $5;")
        .bind(&form.truth_raw_text)
        .bind(rendered_markdown)
        .bind(form.truth_author)
        .bind(week)
        .bind(truth_number)
        .fetch_optional(&mut **db)
        .await {
        Ok(_) => {
            debug!("Truth successfully updated")
        }
        Err(error) => {
            error!("Error while updating truth {truth_number} from week {week} : {error}");
            cookies.add(("toast_error", "Il y a eu un problème lors du changement de la vérité"));
        }
    };

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

#[post("/<week>/new_truth", data="<form>")]
pub async fn create_truth(week: u8, form: Form<TruthUpdateForm>,
                          mut db: Connection<database::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 d'ajouter de vérité."));
        return Redirect::to(uri!(week::week(week)));
    }

    let truth_number: u8 = match sqlx::query("SELECT max(number) from Truths WHERE week == $1;")
        .bind(week)
        .fetch_one(&mut **db)
        .await {
        Ok(row) => match row.try_get::<u8, usize>(0).ok() {
            Some(max_truth_number) => max_truth_number+1,
            None => 0
        },
        Err(_) => 1 // If we can't fetch a row, this is the first one.
    };

    if truth_number == 0 {
        error!("Error while getting max truth number.");
        cookies.add(("toast_error", "Erreur lors de l'ajout de la vérité..."));
        return Redirect::to(uri!(week::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(form.truth_raw_text.as_str(), options);

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

    match sqlx::query("INSERT INTO Truths (week, number, rendered_text, raw_text, author_id) VALUES ($1, $2, $3, $4, $5);")
        .bind(week)
        .bind(truth_number)
        .bind(rendered_markdown)
        .bind(&form.truth_raw_text)
        .bind(form.truth_author)
        .fetch_optional(&mut **db)
        .await {
            Ok(_) => {
                debug!("Truth successfully updated")
            }
            Err(error) => {
                error!("Error while creating truth {truth_number} from week {week} : {error}");
                cookies.add(("toast_error", "Il y a eu un problème lors du changement de la vérité"));
            }
    };

    debug!("Truth was successfully added");

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