From a07485cc9e97e639470e476c9d96552462c0b1f5 Mon Sep 17 00:00:00 2001
From: Priec <filippriec@gmail.com>
Date: Mon, 2 Feb 2026 23:02:27 +0100
Subject: [PATCH] dalsie

---
 src/lib.rs | 41 ++++++++++++++++++++++++++++++++++++++++-
 1 file changed, 40 insertions(+), 1 deletion(-)

diff --git a/src/lib.rs b/src/lib.rs
index 5230770..a3a8129 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -86,7 +86,46 @@ impl Index{
     }
 
     pub fn uloz_do_suboru(&self, cesta_uloz: &std::path::PathBuf) -> bool {
-        true
+        let str_data = match serde_json::to_string(&self) {
+            Ok(x) => x,
+            Err(_) => return false,
+        };
+        match std::fs::write(cesta_uloz, str_data) {
+            Ok(_) => true,
+            Err(_) => false,
+        }
+    }
+
+    pub fn pridaj_predmet2(&mut self, predmet: Predmet) -> Result<(), ()> {
+        let mut je: bool;
+        let var_name = self.predmety.iter().any(|x| x.kod == predmet.kod);
+
+        if var_name {
+            return Err(());
+        }
+        self.predmety.push(predmet);
+        Ok(())
+    }
+
+    pub fn pridaj_predmet(&mut self, predmet: Predmet) -> Result<(), ()> {
+        let mut je: bool;
+        let var_name = self.predmety.iter().filter(|x| x.kod == predmet.kod).count();
+
+        if var_name > 0 {
+            return Err(());
+        } else {
+            self.predmety.push(predmet);
+        }
+        Ok(())
+    }
+
+    pub fn odstran_predmet(&mut self, kod: &str) -> Result<Predmet, ()> {
+        if let Some(index) = self.predmety.iter().position(|x| x.kod == kod) {
+            let odstranenie = self.predmety.remove(index);
+            return Ok(odstranenie);
+        } else {
+            Err(())
+        }
 
     }
 }