From 63bd19127f66dda81007fcd0d8857e978740101f Mon Sep 17 00:00:00 2001
From: Jon Santmyer <jon@jonsantmyer.com>
Date: Mon, 30 Sep 2024 12:01:07 -0400
Subject: First commit

---
 src/system.rs | 78 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 78 insertions(+)
 create mode 100644 src/system.rs

(limited to 'src/system.rs')

diff --git a/src/system.rs b/src/system.rs
new file mode 100644
index 0000000..d11ea3a
--- /dev/null
+++ b/src/system.rs
@@ -0,0 +1,78 @@
+use super::units::*;
+use super::orbital::*;
+use std::vec::Vec;
+use std::rc::Rc;
+use std::cell::RefCell;
+
+pub struct System
+{
+    pub orbitals : Rc<RefCell<Vec<Orbital>>>,
+}
+
+pub struct SystemBuilder
+{
+    orbitals : Rc<RefCell<Vec<Orbital>>>,
+}
+
+impl System
+{
+    fn orbital_set(&self, orbitals : &mut [Orbital], i : usize)
+        -> (&mut Orbital, Option<&mut Orbital>)
+    {
+        //The orbital vector must first be converted to a mutable span, so that I can access the raw data.
+        assert!(i < orbitals.len());
+        unsafe {
+        //From the orbital span, take a raw pointer from the given index, 
+        //cast to a pointer to a mutable Orbital, and dereference.
+            let orbital = &mut *(orbitals.get_unchecked_mut(i) as *mut Orbital);
+            //Assuming the orbital is a valid object, check for the parent orbital.
+            match orbital.origin() {
+                Some(origin_i) => {
+                    //Make sure the origin index does not break rules.
+                    assert!(origin_i != i, "Object cannot orbit itself");
+                    assert!(origin_i < orbitals.len());
+                    let origin = &mut *(orbitals.get_unchecked_mut(origin_i) as *mut Orbital);
+                    (orbital, Some(origin))
+                },
+                None => (orbital, None)
+            }
+        }
+    }
+
+    pub fn tick(&self, t : Second)
+    {
+        let orbitals = &mut self.orbitals.borrow_mut()[..];
+        for i in 0..orbitals.len() {
+            let orbital_set = self.orbital_set(orbitals, i);
+            match orbital_set.1 {
+                Some(origin) => { orbital_set.0.tick(origin, t); },
+                None => {}
+            }
+        }
+    }
+}
+
+impl SystemBuilder
+{
+    pub fn new() -> SystemBuilder
+    {
+        SystemBuilder {
+            orbitals : Rc::new(RefCell::new(vec![]))
+        }
+    }
+
+    pub fn add_body(&self, orbital : Orbital) -> usize
+    {
+        let mut orbitals = self.orbitals.borrow_mut();
+        let new_ind = orbitals.len();
+        orbitals.push(orbital);
+        new_ind
+    }
+
+    pub fn build(self) -> System
+    {
+        System {
+            orbitals : self.orbitals
+        }
+    }
+}
-- 
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