From fd82dad287d02b6648f0b41187711b9cfb12cc00 Mon Sep 17 00:00:00 2001
From: AlexKnauth <alexander@knauth.org>
Date: Fri, 14 Jun 2024 02:50:09 -0400
Subject: [PATCH] unstable: timer_current_split_index

---
 Cargo.toml      |  3 +++
 src/lib.rs      |  1 +
 src/timer.rs    | 46 +++++++++++++++++++++++++++++++++++++++++++++-
 src/unstable.rs | 22 ++++++++++++++++++++++
 4 files changed, 71 insertions(+), 1 deletion(-)
 create mode 100644 src/unstable.rs

diff --git a/Cargo.toml b/Cargo.toml
index 32c9c646..c661e062 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -32,6 +32,9 @@ serde_json = { version = "1" }
 
 xmltree = { version = "0.10.3" }
 
+[features]
+unstable = []
+
 [lib]
 crate-type = ["cdylib"]
 
diff --git a/src/lib.rs b/src/lib.rs
index 534029c1..9f0a1cbf 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -10,6 +10,7 @@ mod legacy_xml;
 mod settings_gui;
 mod splits;
 mod timer;
+mod unstable;
 
 use asr::future::{next_tick, retry};
 use asr::Process;
diff --git a/src/timer.rs b/src/timer.rs
index 1d072cd1..01cc95ef 100644
--- a/src/timer.rs
+++ b/src/timer.rs
@@ -2,6 +2,8 @@
 use asr::timer::TimerState;
 use serde::{Deserialize, Serialize};
 
+use crate::unstable::maybe_timer_current_split_index;
+
 pub fn is_timer_state_between_runs(s: TimerState) -> bool {
     s == TimerState::NotRunning || s == TimerState::Ended
 }
@@ -66,6 +68,13 @@ pub struct Timer {
     /// [1,n): Running
     /// n: Ended without knowing auto-reset safe
     i: usize,
+    /// The last observed timer_current_split_index.
+    /// Just in case timer_current_split_index is a tad out-of-date.
+    /// -2: Unknown
+    /// -1: NotRunning
+    /// [0,n-1): Running
+    /// n-1: Ended
+    last_split_index: i32,
     /// Number of autosplits including both start and end.
     /// One more than the number of segments.
     n: usize,
@@ -84,10 +93,12 @@ impl Resettable for Timer {
 impl Timer {
     pub fn new(n: usize, auto_reset: &'static [TimerState]) -> Timer {
         let asr_state = asr::timer::state();
+        let asr_index = maybe_timer_current_split_index();
         Timer {
             state: asr_state,
             last_state: asr_state,
             i: 0,
+            last_split_index: asr_index.unwrap_or(-2),
             n,
             auto_reset,
         }
@@ -111,6 +122,12 @@ impl Timer {
     }
 
     pub fn update<R: Resettable>(&mut self, r: &mut R) {
+        self.update_state(r);
+        #[cfg(feature = "unstable")]
+        self.update_index();
+    }
+
+    fn update_state<R: Resettable>(&mut self, r: &mut R) {
         let asr_state = asr::timer::state();
         if asr_state == self.state || asr_state == self.last_state {
             self.last_state = asr_state;
@@ -146,6 +163,33 @@ impl Timer {
         self.last_state = asr_state;
     }
 
+    #[cfg(feature = "unstable")]
+    fn update_index(&mut self) -> Option<()>  {
+        let asr_index = maybe_timer_current_split_index()?;
+        if asr_index == self.last_split_index
+        {
+            return Some(());
+        }
+        let delta = asr_index + 1 - self.i as i32;
+        if delta == 0 || delta >= self.n as i32 {
+            return Some(());
+        }
+        match delta {
+            -1 => asr::print_message("Detected a manual undo."),
+            1 => asr::print_message("Detected a manual split or skip."),
+            d if d.is_negative() => asr::print_message(&format!("Detected a {} manual undos.", -d)),
+            d if d.is_positive() => asr::print_message(&format!("Detected a {} manual splits or skips.", d)),
+            _ => (),
+        }
+        let new_i = (self.i as i32 + delta) as usize;
+        if new_i >= self.n && self.is_auto_reset_safe() {
+            self.i = 0;
+        } else {
+            self.i = new_i;
+        }
+        Some(())
+    }
+
     pub fn action<R: Resettable>(&mut self, a: SplitterAction, r: &mut R) {
         match a {
             SplitterAction::Pass => (),
@@ -169,7 +213,7 @@ impl Timer {
                 self.i += 1;
             }
             SplitterAction::ManualSplit => {
-                if 0 < self.i && self.i + 1 < self.n {
+                if self.last_split_index == -2 && 0 < self.i && self.i + 1 < self.n {
                     self.i += 1;
                 }
             }
diff --git a/src/unstable.rs b/src/unstable.rs
new file mode 100644
index 00000000..f8be2e9f
--- /dev/null
+++ b/src/unstable.rs
@@ -0,0 +1,22 @@
+
+#[cfg(feature = "unstable")]
+extern "C" {
+    /// Accesses the index of the split the attempt is currently on. If there's
+    /// no attempt in progress, `-1` is returned instead. This returns an
+    /// index that is equal to the amount of segments when the attempt is
+    /// finished, but has not been reset. So you need to be careful when using
+    /// this value for indexing.
+    fn timer_current_split_index() -> i32;
+}
+
+/// Accesses the index of the split the attempt is currently on. If there's
+/// no attempt in progress, `-1` is returned instead. This returns an
+/// index that is equal to the amount of segments when the attempt is
+/// finished, but has not been reset. So you need to be careful when using
+/// this value for indexing.
+pub fn maybe_timer_current_split_index() -> Option<i32> {
+    #[cfg(feature = "unstable")]
+    return Some(unsafe { timer_current_split_index() });
+    #[allow(unreachable_code)]
+    None
+}