From fa26eb3442a76ea352c0297d891727f2145babf9 Mon Sep 17 00:00:00 2001
From: Mikhail Mitrofanov <mmm606@inbox.ru>
Date: Tue, 14 Apr 2026 16:24:45 +0300
Subject: [PATCH] Fixing bugs

---
 src/data_provider/words.rs |  3 ++-
 src/lang.rs                | 18 +++++++++---------
 src/main.rs                |  1 +
 3 files changed, 12 insertions(+), 10 deletions(-)

diff --git a/src/data_provider/words.rs b/src/data_provider/words.rs
index df3dc4f..52a0049 100644
--- a/src/data_provider/words.rs
+++ b/src/data_provider/words.rs
@@ -9,6 +9,7 @@ pub fn create_db() {
     if !db_file.exists() {
         std::fs::File::create(&db_file).unwrap();
         let connection = Connection::open(&db_file).unwrap();
+        connection.execute("PRAGMA foreign_keys = ON;", []).unwrap();
         create_words_table(&connection);
         create_card_stat_table(&connection);
         create_card_set_table(&connection);
@@ -120,7 +121,7 @@ fn create_card_stat_table(conn: &Connection) {
             score INTEGER NOT NULL DEFAULT 1,
             last_opened INTEGER NOT NULL,
             FOREIGN KEY (word_id)  REFERENCES words (id) ON DELETE CASCADE,
-            FOREIGN KEY (set_id)  REFERENCES sets (id) ON DELETE CASCADE
+            FOREIGN KEY (set_id)  REFERENCES card_set (id) ON DELETE CASCADE
         )",
         (),
     )
diff --git a/src/lang.rs b/src/lang.rs
index e810ca1..301a96f 100644
--- a/src/lang.rs
+++ b/src/lang.rs
@@ -10,7 +10,7 @@ use serde::{Deserialize, Serialize};
 use std::collections::HashMap;
 use std::sync::{Arc, Mutex};
 
-const MAX_SCORE: u8 = 25_u8;
+const MAX_SCORE: i32 = 25;
 const FADE_PER_DAY: f32 = 0.95;
 #[derive(Clone, Debug)]
 pub struct KanaSet {
@@ -252,7 +252,7 @@ pub struct CardStatistics {
     pub word_id: u32,
     pub set_id: u32,
     pub last_open: DateTime<Utc>,
-    pub score: u8,
+    pub score: i32,
 }
 
 impl CardStatistics {
@@ -260,16 +260,16 @@ impl CardStatistics {
         self.last_open = Utc::now();
         match status {
             WordOpenMode::Easy => {
-                self.score = self.calculated_score().round() as u8 + 5;
+                self.score = (self.calculated_score() + 5.0).round() as i32;
             }
             WordOpenMode::Ok => {
-                self.score += self.calculated_score().round() as u8 + 3;
+                self.score = (self.calculated_score() + 3.0).round() as i32
             }
             WordOpenMode::Hard => {
-                self.score = self.calculated_score().round() as u8 - 1;
+                self.score = (self.calculated_score() - 1.0).round() as i32;
             }
             WordOpenMode::None => {
-                self.score = (self.calculated_score() * 0.5) as u8;
+                self.score = (self.calculated_score() * 0.5) as i32;
             }
         }
 
@@ -284,7 +284,7 @@ impl CardStatistics {
         let time = Utc::now() - self.last_open;
         let days = time.num_days();
         let multiplier = FADE_PER_DAY.powi(days as i32);
-        (1.0 / self.score as f32) * multiplier
+         self.score as f32 * multiplier
     }
 }
 
@@ -330,7 +330,7 @@ impl CardSet {
             }
         }
 
-        let indexes = WeightedIndex::new(current_set.iter().map(|s| 1.0 / s.score as f32)).unwrap();
+        let indexes = WeightedIndex::new(current_set.iter().map(|s| 1.0 / s.calculated_score())).unwrap();
 
         Self {
             set: current_set,
@@ -355,7 +355,7 @@ impl CardSet {
 
         let word = &mut self.set[self.current_word_index.unwrap()];
         word.update(status);
-        let new_weight = word.calculated_score();
+        let new_weight = 1.0 / word.calculated_score();
         self.last_weights.update_weights(&[(self.current_word_index.unwrap(), &new_weight)]).unwrap();
         {
             update_stat_score(word, &self.state.lock().unwrap().connection)
diff --git a/src/main.rs b/src/main.rs
index 80d3d5c..2c77703 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -84,6 +84,7 @@ impl Default for ScreenState {
         let path = app_data_dir();
         let db_file = path.join("data.db");
         let connection = Connection::open(db_file).unwrap();
+        connection.execute("PRAGMA foreign_keys = ON;", []).unwrap();
         let list: Vec<DictionaryElement> = load_words(&connection);
         let sets: Vec<CardSetSettings> = load_sets(&connection);