From 25afb0bde9b8a2c064135a534231c232a461b341 Mon Sep 17 00:00:00 2001
From: Joris
Date: Sun, 16 Feb 2020 22:45:07 +0100
Subject: Set up a first version of tabata timer

---
 src/step.ml | 40 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 40 insertions(+)
 create mode 100644 src/step.ml

(limited to 'src/step.ml')

diff --git a/src/step.ml b/src/step.ml
new file mode 100644
index 0000000..02a110e
--- /dev/null
+++ b/src/step.ml
@@ -0,0 +1,40 @@
+type step = Prepare | Work | Rest | End
+
+let prettyPrint step =
+  match step with
+  | Prepare -> "Prepare"
+  | Work -> "Work"
+  | Rest -> "Rest"
+  | End -> "End"
+
+type state = { step : step; remaining : int; tabata : int; cycle : int }
+
+let getAt (config : Config.config) elapsed =
+  let cycleDuration = config.work + config.rest in
+  let tabataDuration = config.prepare + (config.cycles * cycleDuration) in
+  if elapsed >= tabataDuration * config.tabatas then
+    {
+      step = End;
+      remaining = 0;
+      tabata = config.tabatas;
+      cycle = config.cycles;
+    }
+  else
+    let currentTabataElapsed = elapsed mod tabataDuration in
+    let step, remaining =
+      if currentTabataElapsed < config.prepare then
+        (Prepare, config.prepare - currentTabataElapsed)
+      else
+        let currentCycleElapsed =
+          (currentTabataElapsed - config.prepare) mod cycleDuration
+        in
+        if currentCycleElapsed < config.work then
+          (Work, config.work - currentCycleElapsed)
+        else (Rest, config.work + config.rest - currentCycleElapsed)
+    in
+    let tabata = (elapsed / tabataDuration) + 1 in
+    let cycle =
+      if currentTabataElapsed < config.prepare then 1
+      else ((currentTabataElapsed - config.prepare) / cycleDuration) + 1
+    in
+    { step; remaining; tabata; cycle }
-- 
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