rename frontend to web and update contributing guide (#2509)

* rename frontend to web and update contributing guide

* rename this time

* fix build

* restructure rust code

* update documentation

* update descriptions

* Update CONTRIBUTING.md

Co-authored-by: J H <2364004+Blu-J@users.noreply.github.com>

---------

Co-authored-by: Aiden McClelland <me@drbonez.dev>
Co-authored-by: Aiden McClelland <3732071+dr-bonez@users.noreply.github.com>
Co-authored-by: J H <2364004+Blu-J@users.noreply.github.com>

web/projects/ui/src/app/services/time-service.ts

@@ -0,0 +1,59 @@
+import { Injectable } from '@angular/core'
+import { map, shareReplay, startWith, switchMap } from 'rxjs/operators'
+import { PatchDB } from 'patch-db-client'
+import { DataModel } from './patch-db/data-model'
+import { ApiService } from './api/embassy-api.service'
+import { combineLatest, interval, of } from 'rxjs'
+
+@Injectable({
+  providedIn: 'root',
+})
+export class TimeService {
+  private readonly time$ = of({}).pipe(
+    switchMap(() => this.apiService.getSystemTime({})),
+    switchMap(({ now, uptime }) => {
+      const current = new Date(now).valueOf()
+      return interval(1000).pipe(
+        map(index => {
+          const incremented = index + 1
+          return {
+            now: current + 1000 * incremented,
+            uptime: uptime + incremented,
+          }
+        }),
+        startWith({
+          now: current,
+          uptime,
+        }),
+      )
+    }),
+    shareReplay({ bufferSize: 1, refCount: true }),
+  )
+
+  readonly now$ = combineLatest([
+    this.time$,
+    this.patch.watch$('server-info', 'ntp-synced'),
+  ]).pipe(
+    map(([time, synced]) => ({
+      value: time.now,
+      synced,
+    })),
+  )
+
+  readonly uptime$ = this.time$.pipe(
+    map(({ uptime }) => {
+      const days = Math.floor(uptime / (24 * 60 * 60))
+      const daysSec = uptime % (24 * 60 * 60)
+      const hours = Math.floor(daysSec / (60 * 60))
+      const hoursSec = uptime % (60 * 60)
+      const minutes = Math.floor(hoursSec / 60)
+      const seconds = uptime % 60
+      return { days, hours, minutes, seconds }
+    }),
+  )
+
+  constructor(
+    private readonly patch: PatchDB<DataModel>,
+    private readonly apiService: ApiService,
+  ) {}
+}