progress

gpx-rs/src/engine.rs

@@ -0,0 +1,64 @@
+use std::rc::Rc;
+
+use uuid::Uuid;
+use wasm_bindgen::prelude::*;
+
+use crate::{
+    gpx::GPXFile,
+    io::parse,
+    selection::Selection,
+    stack::{Stack, StackEntry},
+};
+
+// Control flow
+// - get lock to cancel any other updates
+// - update files
+// - update separate statistics
+// - update selection
+// - update selection statistics
+// - notify UI (changed files, updated selection, new stats)
+
+#[wasm_bindgen]
+pub struct Controller {
+    stack: Stack,
+    selection: Selection,
+}
+
+#[wasm_bindgen]
+impl Controller {
+    #[wasm_bindgen(constructor)]
+    pub fn new() -> Self {
+        Self {
+            stack: Default::default(),
+            selection: Default::default(),
+        }
+    }
+
+    #[wasm_bindgen]
+    pub fn create_file(&mut self, name: &str) {
+        let mut file = GPXFile::default();
+        file.info.name = name.to_string();
+        self.stack.create_and_push_next(|entry: &mut StackEntry| {
+            entry.insert(file.id, Rc::new(file));
+            true
+        });
+    }
+
+    #[wasm_bindgen]
+    pub fn load_file(&mut self, data: &[u8]) {
+        if let Ok(file) = parse(data) {
+            self.stack.create_and_push_next(|entry: &mut StackEntry| {
+                entry.insert(file.id, Rc::new(file));
+                true
+            });
+        }
+    }
+
+    #[wasm_bindgen]
+    pub fn delete_file(&mut self, id: &[u8]) {
+        if let Ok(id) = Uuid::from_slice(id) {
+            self.stack
+                .create_and_push_next(|entry: &mut StackEntry| entry.remove(&id).is_some());
+        }
+    }
+}