From 0d8d8a815d14f8ca0ba571a6a253d32e240e88cb Mon Sep 17 00:00:00 2001
From: Christiantyemele <yemelechristian2@gmail.com>
Date: Wed, 3 Apr 2024 17:59:52 +0100
Subject: [PATCH] feat(indexeddb): indexeddb storageservice implementation

Signed-off-by: Christiantyemele <yemelechristian2@gmail.com>
---
 .../src/Hooks/StorageContext.tsx              | 236 ++++++++++++++++++
 1 file changed, 236 insertions(+)
 create mode 100644 power-pay-frontend/src/Hooks/StorageContext.tsx

diff --git a/power-pay-frontend/src/Hooks/StorageContext.tsx b/power-pay-frontend/src/Hooks/StorageContext.tsx
new file mode 100644
index 00000000..fe2347ff
--- /dev/null
+++ b/power-pay-frontend/src/Hooks/StorageContext.tsx
@@ -0,0 +1,236 @@
+import {createContext, PropsWithChildren, useEffect, useState} from 'react';
+
+
+// Define the StorageContextData interface.
+export interface StorageContextData<T> {
+    item: Record<string, T>;
+    setItem: (key: string, value: T) => Promise<boolean>;
+    removeItem: (key: string) => Promise<boolean>;
+    clear: () => Promise<boolean>;
+}
+
+// Define the StorageService interface.
+interface StorageService {
+    clear: () => Promise<boolean>;
+    getItem: <T>(key: string) => Promise<T | undefined>;
+    removeItem: (key: string) => Promise<boolean | void>
+
+
+
+}
+interface SetStorage {
+    setItem: <T>(key: string, value: T) => Promise<boolean | void>;
+}
+interface SetStorageIDB {
+    setItem: <T>(value: object, key: IDBValidKey) => Promise<boolean | void>;
+}
+
+// Define the LocalStorageService class implementing the StorageService interface.
+export class LocalStorageService implements StorageService, SetStorage {
+    async getItem<T>(key: string): Promise<T | undefined> {
+        const found = localStorage.getItem(key);
+        if (!found) return undefined;
+        return JSON.parse(found) as T;
+    }
+
+    async setItem<T>(key: string  , value: T): Promise<boolean | void> {
+        localStorage.setItem(key, JSON.stringify(value));
+        return true;
+    }
+
+    async removeItem(key: string): Promise<boolean> {
+        localStorage.removeItem(key);
+        return true;
+    }
+
+    async clear(): Promise<boolean> {
+        localStorage.clear();
+        return true;
+    }
+}
+
+export class IndexedDBStorageService implements StorageService, SetStorageIDB {
+    private dbName: string;
+    private version: number;
+    private db: IDBDatabase
+
+    constructor(dbName: string = 'dbname', version?: number) {
+        this.dbName = dbName;
+
+    }
+
+    async openDatabase(dbName?: string, Version?: number): Promise<IDBDatabase> {
+        return new Promise((resolve, reject) => {
+
+            const request = window.indexedDB.open(dbName ?? this.dbName);
+
+            request.onerror = (event: Event) => {
+                reject((event.target as IDBOpenDBRequest).error);
+            };
+
+            request.onsuccess = (event: Event) => {
+                resolve((event.target as IDBOpenDBRequest).result);
+            };
+
+            request.onupgradeneeded = (event: Event) => {
+
+                this.db = (event.target as IDBOpenDBRequest).result;
+                const objectstore = this.db.createObjectStore('objectstore', {keyPath: 'id'})
+            };
+        });
+    }
+
+    async clear(): Promise<boolean> {
+
+        if (!this.db)
+            await this.openDatabase()
+
+        return new Promise((resolve, reject) => {
+            const transaction =
+
+                this.db.transaction('objectstore', 'readwrite')
+                    .objectStore('objectstore')
+                    .clear();
+            transaction.onsuccess = (event: Event) => {
+                resolve((event.target as IDBRequest).result)
+            }
+            transaction.onerror = (event: Event) => {
+                reject((event.target as IDBRequest).onerror)
+            }
+        })
+
+    }
+
+    async getItem<T>(keypath: any): Promise<T | undefined> {
+        if (!this.db)
+            await this.openDatabase()
+        return new Promise((resolve, reject) => {
+            const transaction = this.db.transaction('objectstore', 'readonly')
+
+                .objectStore('objectstore')
+
+                .get(keypath)
+
+            transaction.onsuccess = (event) => {
+
+                resolve((event.target as IDBRequest).result)
+            }
+            transaction.onerror = (event: Event) => {
+                reject((event.target as IDBRequest).onerror)
+            }
+        })
+    }
+
+    async removeItem(key: string): Promise<boolean | void> {
+        if (!this.db)
+            await this.openDatabase()
+
+        return new Promise((resolve, reject) => {
+            const transaction = this.db.transaction('objectstore', 'readwrite')
+
+                .objectStore('objectstore')
+
+                .delete(key);
+
+            transaction.onerror = (event: Event) => {
+                reject((event.target as IDBRequest).error);
+            };
+
+            transaction.onsuccess = (event: Event) => {
+                resolve((event.target as IDBRequest).result);
+            };
+        });
+    }
+
+    async setItem<T>(value: object, key?: IDBValidKey): Promise<boolean | void> {
+        if (!this.db)
+            await this.openDatabase()
+
+        return new Promise((resolve, reject) => {
+            const transaction = this.db.transaction('objectstore', 'readwrite')
+                .objectStore('objectstore')
+
+                .add(value, key);
+
+
+            transaction.onerror = (event: Event) => {
+
+                reject((event.target as IDBRequest).error);
+            };
+
+            transaction.onsuccess = (event: Event) => {
+
+                resolve((event.target as IDBRequest).result);
+
+            };
+        });
+
+    }
+}
+
+// Define a global constant for the key.
+const
+    STORAGE_KEY = 'new_key';
+
+// Create the StorageContext with default functions for getItem and setItem.
+const
+    StorageContext = createContext<StorageContextData<unknown> | undefined>(undefined);
+
+// Define the StorageProvider component
+export function
+
+StorageProvider<T>({children, storageService}: PropsWithChildren<{ storageService: StorageService }>) {
+    const [storedValue, setStoredValue] = useState<Record<string, T>>({});
+
+    // Initialize the state with the value from the local storage if it exists.
+    useEffect(() => {
+        storageService
+            .getItem<Record<string, T>>(STORAGE_KEY)
+            .then((item) => {
+                if (item) {
+                    setStoredValue(item);
+                }
+            });
+    }, [storageService]);
+
+    // Updates the local storage whenever the state changes.
+    useEffect(() => {
+        storageService.setItem(STORAGE_KEY, storedValue);
+    }, [storageService, storedValue]);
+
+    // Remove the item from local storage and set the stored value to undefined
+    const clearItem = async (key: string): Promise<boolean> => {
+        localStorage.removeItem(key);
+        setStoredValue((prevState) => {
+            const newState = {...prevState};
+            delete newState[key];
+            return newState;
+        });
+        return true;
+    };
+
+    // Define the context value.
+    const contextValue: StorageContextData<T> = {
+        item: storedValue,
+        setItem: async (key, value) => {
+            setStoredValue((prevState) => ({
+                ...prevState,
+                [key]: value,
+            }));
+            return true;
+        },
+        removeItem: async (key) => clearItem(key),
+        clear: async () => {
+            setStoredValue({});
+            return true;
+        },
+    };
+
+    return (
+        <StorageContext.Provider value={contextValue}>
+            {children}
+        </StorageContext.Provider>
+    );
+}
+
+export default StorageContext;