frontend/src/app/service/db/database.service.ts

import { Injectable } from '@angular/core';
import Dexie from 'dexie';
import {IMigration, Migration} from './Migration';
import {IMenuItem, MenuItem} from './MenuItem';
import {KeyValue, IKeyValue} from './KeyValue';
import {Codium, ICodium} from './Codium';

@Injectable({
    providedIn: 'root'
})
export class DatabaseService extends Dexie {
    protected static registeredModels = [Migration, MenuItem, KeyValue, Codium];
    protected initialized = false;

    migrations!: Dexie.Table<IMigration, number>;
    menuItems!: Dexie.Table<IMenuItem, number>;
    keyValues!: Dexie.Table<IKeyValue, number>;
    codiums!: Dexie.Table<ICodium, number>;

    constructor(
    ) {
        super('NodedLocalDatabase');
    }

    public async getKeyValue(key: string): Promise<KeyValue> {
        const matches = await this.keyValues.where({ key }).toArray();

        if ( matches.length > 0 ) {
            return matches[0] as KeyValue;
        }

        return new KeyValue(key, '', false);
    }

    public async createSchemata() {
        if ( this.initialized ) {
            return;
        }
        this.initialized = true;

        console.log('db', this);

        const staticClass = this.constructor as typeof DatabaseService;
        const schema: any = {};

        for ( const ModelClass of staticClass.registeredModels ) {
            ModelClass.dbService = this;
            schema[ModelClass.getTableName()] = ModelClass.getSchema();
        }

        await this.version(5).stores(schema);
        await this.open();

        this.migrations = this.table('migrations');
        this.migrations.mapToClass(Migration);

        this.menuItems = this.table('menuItems');
        this.menuItems.mapToClass(MenuItem);

        this.keyValues = this.table('keyValues');
        this.keyValues.mapToClass(KeyValue);

        this.codiums = this.table('codiums');
        this.codiums.mapToClass(Codium);
    }
}