From b06a89350f27e5cda0f54b5c1c8b162caf8612b9 Mon Sep 17 00:00:00 2001
From: Kacper Donat <kadet1090@gmail.com>
Date: Sun, 26 Jan 2020 17:24:08 +0100
Subject: [PATCH] Add very primitive migration engine

---
 resources/ts/app.ts                   |  4 ++
 resources/ts/components/favourites.ts | 11 ++----
 resources/ts/store/favourites.ts      |  1 -
 resources/ts/store/migrations.ts      | 56 +++++++++++++++++++++++++++
 resources/ts/utils.ts                 |  4 ++
 5 files changed, 68 insertions(+), 8 deletions(-)
 create mode 100644 resources/ts/store/migrations.ts

diff --git a/resources/ts/app.ts b/resources/ts/app.ts
index 1538913..2385e16 100644
--- a/resources/ts/app.ts
+++ b/resources/ts/app.ts
@@ -17,6 +17,8 @@ import PortalVue from 'portal-vue';
 import VueDragscroll from 'vue-dragscroll';
 import { Workbox } from "workbox-window";
 
+import { migrate } from "./store/migrations";
+
 Vue.use(Vuex);
 Vue.use(PortalVue);
 Vue.use(VueDragscroll);
@@ -25,6 +27,8 @@ Vue.prototype.$isTouch = 'ontouchstart' in window || navigator.msMaxTouchPoints
 
 // async dependencies
 (async function () {
+    await migrate("vuex");
+
     const [ components, { default: store } ] = await Promise.all([
         import('./components'),
         import('./store'),
diff --git a/resources/ts/components/favourites.ts b/resources/ts/components/favourites.ts
index 10c11fa..5a5f5bf 100644
--- a/resources/ts/components/favourites.ts
+++ b/resources/ts/components/favourites.ts
@@ -1,6 +1,6 @@
 import Vue from 'vue'
 import { Component, Prop } from 'vue-property-decorator'
-import { namespace, State } from "vuex-class";
+import { namespace, State, Mutation } from "vuex-class";
 import { Favourite } from "../store/favourites";
 import { SavedState } from "../store/root";
 import { Stop } from "../model";
@@ -12,9 +12,10 @@ import { Favourites } from "../store";
 export class FavouritesComponent extends Vue {
     @Favourites.State favourites: Favourite[];
     @Favourites.Mutation remove: (fav: Favourite) => void;
+    @Mutation('replace') setStops: (stops: Stop[]) => void;
 
     choose(favourite: Favourite) {
-        this.$store.dispatch('load', favourite.state);
+        this.setStops(favourite.stops);
     }
 }
 
@@ -22,11 +23,7 @@ function createFavouriteEntry(name: string, stops: Stop[]): Favourite {
     return {
         id: uuid.v4(),
         name,
-        stops,
-        state: {
-            version: 1,
-            stops: stops.map(stop => stop.id),
-        },
+        stops
     }
 }
 
diff --git a/resources/ts/store/favourites.ts b/resources/ts/store/favourites.ts
index ebc27eb..0ba6343 100644
--- a/resources/ts/store/favourites.ts
+++ b/resources/ts/store/favourites.ts
@@ -7,7 +7,6 @@ export interface Favourite {
     id: string;
     name:  string;
     stops: Stop[];
-    state: SavedState;
 }
 
 export interface FavouritesState {
diff --git a/resources/ts/store/migrations.ts b/resources/ts/store/migrations.ts
new file mode 100644
index 0000000..444fa35
--- /dev/null
+++ b/resources/ts/store/migrations.ts
@@ -0,0 +1,56 @@
+import { distinct } from "../utils";
+import urls from "../urls";
+import * as uuid from "uuid";
+
+type Migration = {
+    name: string,
+    key: string,
+    up: (state: any) => Promise<any>;
+}
+
+const migrations: Migration[] = [
+    {
+        name: "202001261540_full_stop_in_state",
+        key: "vuex",
+        up: async state => {
+            const current = state.favourites.favourites;
+
+            const ids = current
+                .map(favourite => favourite.state.stops)
+                .reduce((cur, acc) => [ ...cur, ...acc ])
+                .filter(distinct)
+            ;
+
+            const stops  = await (await fetch(urls.prepare(urls.stops.all, { id: ids }))).json();
+            const lookup = stops.reduce((lookup, stop) => ({ ...lookup, [stop.id]: stop }), {});
+
+            return {
+                ...state,
+                favourites: {
+                    ...state.favourites,
+                    favourites: state.favourites.favourites.map(favourite => ({
+                        id: favourite.id || uuid.v4(),
+                        name: favourite.name,
+                        stops: favourite.stops || favourite.state.stops.map(id => lookup[id]).filter(distinct),
+                    }))
+                }
+            }
+        }
+    }
+];
+
+export async function migrate(key: string) {
+    const current = JSON.parse(window.localStorage.getItem('migrations')) || [];
+    const state   = JSON.parse(window.localStorage.getItem(key)) || {};
+
+    const result = await migrations
+        .filter(migration => migration.key == key)
+        .filter(migration => !current.includes(migration.name))
+        .reduce(async (state, migration) => {
+            current.push(migration.name);
+            return await migration.up(state)
+        }, state);
+
+    window.localStorage.setItem('migrations', JSON.stringify(current));
+    window.localStorage.setItem(key, JSON.stringify(result));
+}
diff --git a/resources/ts/utils.ts b/resources/ts/utils.ts
index 0fcbb68..293f245 100644
--- a/resources/ts/utils.ts
+++ b/resources/ts/utils.ts
@@ -63,3 +63,7 @@ export function get(object: any, path: string): any {
 
     return object[segments.shift()];
 }
+
+export function distinct<T>(value: T, index: number, array: T[]) {
+    return array.indexOf(value) === index;
+}