Merge reminder & backend features

src/backend/base.ts

@@ -1,9 +1,28 @@
-import { BackendConfig } from "../types/config";
+import { BackendSettings, Config } from "../types/config";
 import { Notification } from "../types/notification";
 
-export abstract class Backend {  
-  constructor(config: BackendConfig) {    
+export abstract class Backend<C extends BackendSettings> {
+  public abstract readonly name: string;
+  protected abstract requiredFields: readonly (keyof C)[];
+  protected abstract notify(config: C, notification: Notification): void;
+
+  #validate(config: Partial<C>): C {
+    for (const field of this.requiredFields) {
+      if (config[field] === undefined) {
+        throw new Error(`The '${String(field)}' configuration field of'${this.name}' consumer is required`)
+      }
+    }
+
+    return config as C;
   }
 
-  abstract notify(notification: Notification): void;
+  public remind(config: Config, notification: Notification) {
+    const cfg = config.backend[this.name] as Partial<C>;
+
+    if (cfg.enable !== true) {
+      return
+    }
+
+    this.notify(this.#validate(cfg), notification);
+  }
 }