added export_csv to id_store

Also some fixes and formatting

src/id_store.rs

@@ -1,72 +1,111 @@
-use std::{collections::HashMap, error::Error, fs::{self, read_to_string}, result};
 use serde::{Deserialize, Serialize};
+use std::{
+    collections::{HashMap, HashSet},
+    error::Error,
+    fs,
+};
 
-#[derive(PartialEq, Eq)]
-#[derive(Deserialize, Serialize)]
-struct TellyID (String);
+#[derive(PartialEq, Eq, Deserialize, Serialize, Hash, Clone, PartialOrd, Ord)]
+pub struct TellyID(pub String);
 
 #[derive(Deserialize, Serialize)]
-struct AttendanceDay {
+pub struct AttendanceDay {
     date: String,
     ids: Vec<TellyID>,
 }
 
 #[derive(Deserialize, Serialize)]
-struct IDStore {
-    days: HashMap<String,AttendanceDay>
+pub struct IDStore {
+    days: HashMap<String, AttendanceDay>,
 }
 
 impl IDStore {
-    
-    fn new() -> Self {
-        IDStore{
+    pub fn new() -> Self {
+        IDStore {
             days: HashMap::new(),
         }
     }
 
-    fn new_from_json(filepath:&str) -> Result<Self, Box<dyn Error>>{
+    pub fn new_from_json(filepath: &str) -> Result<Self, Box<dyn Error>> {
         let readed_string = fs::read_to_string(filepath)?;
         Ok(serde_json::from_str(&readed_string)?)
     }
 
-    fn add_id(&mut self, id: TellyID){
+    pub fn add_id(&mut self, id: TellyID) {
         let day = self.get_current_day();
 
         day.add_id(id);
-    
     }
 
-    fn get_current_day(&mut self) -> &mut AttendanceDay {
+    pub fn get_current_day(&mut self) -> &mut AttendanceDay {
         let current_day = get_day_str();
 
         if self.days.contains_key(&current_day) {
             return self.days.get_mut(&current_day).unwrap();
         }
 
-        self.days.insert(current_day.clone(), AttendanceDay::new(&current_day.clone()));
+        self.days.insert(
+            current_day.clone(),
+            AttendanceDay::new(&current_day.clone()),
+        );
 
         self.days.get_mut(&current_day.clone()).unwrap()
     }
 
-    fn export_jason(&self, filepath:&str) -> Result <(), Box<dyn Error>> {
-
+    pub fn export_json(&self, filepath: &str) -> Result<(), Box<dyn Error>> {
         // Serialize it to a JSON string and safe it in filepath file
-        Ok(fs::write("attendence_list.json", serde_json::to_string(&self)?)?)
+        Ok(fs::write(filepath, serde_json::to_string(&self)?)?)
+    }
+
+    pub fn export_csv(&self) -> Result<String, Box<dyn Error>> {
+        let seperator = ";";
+        let mut user_ids: HashSet<TellyID> = HashSet::new();
+
+        for day in self.days.values() {
+            for id in day.ids.iter() {
+                user_ids.insert(id.clone());
+            }
+        }
+
+        let mut user_ids: Vec<TellyID> = user_ids.into_iter().collect();
+        user_ids.sort();
+
+        let mut days: Vec<String> = self.days.keys().cloned().collect();
+        days.sort();
+
+        let header = days.join(seperator);
+        println!("ID,{}", header);
+
+        for user_id in user_ids.iter() {
+            print!("{},", user_id.0);
+            for day in days.iter() {
+                let was_there: bool = self.days.get(day).unwrap().ids.contains(user_id);
+
+                if was_there {
+                    print!("{}x", seperator);
+                } else {
+                    print!("{}", seperator);
+                }
+            }
+            println!();
+        }
+
+        Ok("".to_owned())
     }
 }
 
 impl AttendanceDay {
-    fn new(day: &str) -> Self{
-        Self{
+    fn new(day: &str) -> Self {
+        Self {
             date: day.to_owned(),
             ids: Vec::new(),
         }
     }
 
-    fn add_id(&mut self, id: TellyID){
+    fn add_id(&mut self, id: TellyID) {
         if self.ids.contains(&id) {
-            return
-        } 
+            return;
+        }
         self.ids.push(id);
     }
 }