feat: initial working version of project manager

app/src/lib/project-manager/project-manager.svelte.ts

@@ -0,0 +1,93 @@
+import * as templates from '$lib/graph-templates';
+import { localState } from '$lib/helpers/localState.svelte';
+import type { Graph } from '@nodarium/types';
+import * as db from './project-database.svelte';
+
+export class ProjectManager {
+  public graph = $state<Graph>();
+  private projects = $state<Graph[]>([]);
+  private activeProjectId = localState<number | undefined>(
+    'node.activeProjectId',
+    undefined
+  );
+  public readonly loading = $derived(this.graph?.id !== this.activeProjectId.value);
+
+  constructor() {
+    this.init();
+  }
+
+  async saveGraph(g: Graph) {
+    db.saveGraph(g);
+  }
+
+  private async init() {
+    await db.getDB();
+    this.projects = await db.getGraphs();
+
+    console.log('PM: INIT', {
+      projects: this.projects,
+      activeProjectId: this.activeProjectId.value
+    });
+
+    if (this.activeProjectId.value !== undefined) {
+      let loadedGraph = await db.getGraph(this.activeProjectId.value);
+      console.log('PM: LOAD ACTIVE PROJECT', { loadedGraph });
+      if (loadedGraph) {
+        console.log('Load active project');
+        this.graph = loadedGraph;
+      }
+    }
+
+    if (!this.graph) {
+      console.log('Load first active project', { projectsAmount: this.projects.length });
+      if (this.projects?.length && this.projects[0]?.id !== undefined) {
+        this.graph = this.projects[0];
+        this.activeProjectId.value = this.graph.id;
+      }
+    }
+
+    if (!this.graph) {
+      console.log('Create default project');
+      this.handleCreateProject();
+    }
+  }
+
+  public handleCreateProject(
+    g: Graph = templates.defaultPlant as unknown as Graph,
+    title: string = 'New Project'
+  ) {
+    let id = g?.id || 0;
+    while (this.projects.find((p) => p.id === id)) {
+      id++;
+    }
+
+    console.log('CREATE PROJECT', { id, title });
+
+    g.id = id;
+    if (!g.meta) g.meta = {};
+    if (!g.meta.title) g.meta.title = title;
+
+    db.saveGraph(g);
+    this.projects = [...this.projects, g];
+    this.handleSelectProject(id);
+  }
+
+  public async handleDeleteProject(projectId: number) {
+    await db.deleteGraph(projectId);
+    if (this.projects.length === 1) {
+      this.graph = undefined;
+      this.projects = [];
+    } else {
+      this.projects = this.projects.filter((p) => p.id !== projectId);
+      this.handleSelectProject(this.projects[0].id);
+    }
+  }
+
+  public async handleSelectProject(id: number) {
+    if (this.activeProjectId.value !== id) {
+      const project = await db.getGraph(id);
+      this.graph = project;
+      this.activeProjectId.value = id;
+    }
+  }
+}