From 96c07bab1086510a55a004e9a1b90c30bc723a5c Mon Sep 17 00:00:00 2001
From: sangtran <tranquangsang12.7@gmail.com>
Date: Sat, 29 Aug 2026 01:08:28 +0700
Subject: feat: init base draft support window

---
 core/state_backend.go | 62 +++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)
 create mode 100644 core/state_backend.go

(limited to 'core/state_backend.go')

diff --git a/core/state_backend.go b/core/state_backend.go
new file mode 100644
index 0000000..9f9f397
--- /dev/null
+++ b/core/state_backend.go
@@ -0,0 +1,62 @@
+package core
+
+import (
+	"context"
+)
+
+type StateBackend interface {
+	// For Framework ===
+	// SetCurrentKey will perform in Memory
+	SetCurrentKey(key string) error
+	// GetCurrentKey will perform in Memory
+	GetCurrentKey() string
+	SetCurrentNamespace(namespace any) error
+	GetCurrentNamespace() any
+
+	// For User ===
+	// GetValueState will perform in disk
+	GetValueState(ctx context.Context, key string) (ValueState[any], error)
+}
+
+type stateBackendKeyType struct{}
+
+var stateBackendKey stateBackendKeyType
+
+type typedValueState[T any] struct {
+	inner ValueState[any]
+}
+
+func CastValueType[T any](inner ValueState[any]) ValueState[T] {
+	return &typedValueState[T]{inner: inner}
+}
+
+func (s *typedValueState[T]) Value(ctx context.Context) (T, error) {
+	val, err := s.inner.Value(ctx)
+	if err != nil {
+		var zero T
+		return zero, err
+	}
+	if val == nil {
+		var zero T
+		return zero, nil
+	}
+	return val.(T), nil
+}
+
+func (s *typedValueState[T]) Update(ctx context.Context, newVal T) (T, error) {
+	_, err := s.inner.Update(ctx, newVal)
+	return newVal, err
+}
+
+func (s *typedValueState[T]) Clear(ctx context.Context) error {
+	return s.inner.Clear(ctx)
+}
+
+func InjectStateBackend(ctx context.Context, state StateBackend) context.Context {
+	return context.WithValue(ctx, stateBackendKey, state)
+}
+
+func ExtractStateBackend(ctx context.Context) (StateBackend, bool) {
+	backend, ok := ctx.Value(stateBackendKey).(StateBackend)
+	return backend, ok
+}
-- 
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