From 2183b74ee7dd87cc59545181772788388084cf67 Mon Sep 17 00:00:00 2001
From: falsycat <me@falsy.cat>
Date: Sun, 6 Oct 2019 00:00:00 +0000
Subject: [PATCH] [add] Added ScheduledControllerInterface.

---
 .../sjplayer/ScheduledControllerInterface.d   | 62 +++++++++++++++++++
 sjplayer/src/sjplayer/util/compare.d          | 14 +++++
 2 files changed, 76 insertions(+)
 create mode 100644 sjplayer/src/sjplayer/ScheduledControllerInterface.d
 create mode 100644 sjplayer/src/sjplayer/util/compare.d

diff --git a/sjplayer/src/sjplayer/ScheduledControllerInterface.d b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
new file mode 100644
index 0000000..404238d
--- /dev/null
+++ b/sjplayer/src/sjplayer/ScheduledControllerInterface.d
@@ -0,0 +1,62 @@
+/// License: MIT
+module sjplayer.ScheduledControllerInterface;
+
+import std.algorithm,
+       std.array;
+
+import sjscript;
+
+import sjplayer.util.compare;
+
+///
+interface ScheduledControllerInterface {
+ public:
+  ///
+  void Operate(float time);
+}
+
+///
+abstract class AbstractScheduledController : ScheduledControllerInterface {
+ public:
+  /// The operations must be sorted.
+  this(in ParametersBlock[] operations) {
+    operations_ = operations;
+  }
+
+  override void Operate(float time) {
+    scope(exit) last_operation_time_ = time;
+
+    if (next_operation_index_ >= 1) {
+      assert(next_operation_index_ <= operations_.length);
+
+      const last_operation = &operations_[next_operation_index_-1];
+      if (IsTimeInPeriod(time, last_operation.period)) {
+        ProcessOperation(*last_operation);
+        return;
+      }
+      FinishOperation(*last_operation);
+    }
+
+    if (next_operation_index_ >= operations_.length) return;
+
+    const next_operation = &operations_[next_operation_index_];
+    if (IsTimeInPeriod(time, next_operation.period)) {
+      PrepareOperation(*next_operation);
+      ++next_operation_index_;
+    }
+  }
+
+ protected:
+  abstract void PrepareOperation(ref in ParametersBlock params);
+
+  abstract void ProcessOperation(ref in ParametersBlock params);
+
+  abstract void FinishOperation(ref in ParametersBlock params);
+
+ private:
+  const ParametersBlock[] operations_;
+
+  float last_operation_time_ = -1;
+
+  size_t next_operation_index_;
+}
diff --git a/sjplayer/src/sjplayer/util/compare.d b/sjplayer/src/sjplayer/util/compare.d
new file mode 100644
index 0000000..f1616d0
--- /dev/null
+++ b/sjplayer/src/sjplayer/util/compare.d
@@ -0,0 +1,14 @@
+/// License: MIT
+module sjplayer.util.compare;
+
+import sjscript;
+
+///
+bool IsTimeInPeriod(float time, in Period period) {
+  return period.start <= time && time < period.end;
+}
+
+///
+bool IsPeriodIntersectedToPeriod(in Period p1, in Period p2) {
+  return p1.start < p2.end && p2.start < p1.end;
+}