From a160c5331a53eca772250405c687fdfb2ee70a4e Mon Sep 17 00:00:00 2001
From: Chris Veilleux <veilleux.chris@gmail.com>
Date: Mon, 22 Oct 2018 21:44:21 -0500
Subject: [PATCH] new service for all skill add/remove logic

---
 .../src/app/skills/install.service.ts         | 140 ++++++++++++++++++
 1 file changed, 140 insertions(+)
 create mode 100644 market/frontend/v1/market-ui/src/app/skills/install.service.ts

diff --git a/market/frontend/v1/market-ui/src/app/skills/install.service.ts b/market/frontend/v1/market-ui/src/app/skills/install.service.ts
new file mode 100644
index 00000000..621cbe7c
--- /dev/null
+++ b/market/frontend/v1/market-ui/src/app/skills/install.service.ts
@@ -0,0 +1,140 @@
+import { HttpClient } from '@angular/common/http';
+import { Injectable } from '@angular/core';
+import { Observable, Subject } from "rxjs";
+import { AvailableSkill, SkillDetail } from "./skills.service";
+
+type InstallStatus = 'failed' | 'installed' | 'installing' | 'uninstalling';
+
+export interface SkillInstallStatus {
+    [key: string]: InstallStatus;
+}
+
+export interface FailureReason {
+    [key: string]: string;
+}
+
+export interface Installations {
+    failureReasons: FailureReason;
+    installStatuses: SkillInstallStatus;
+}
+
+// const inProgressStatuses = ['installing', 'uninstalling', 'failed'];
+const inProgressStatuses = ['installing', 'uninstalling'];
+const installStatusUrl = '/api/skill/installations';
+const installUrl = '/api/skill/install';
+const uninstallUrl = '/api/skill/uninstall';
+
+@Injectable({
+    providedIn: 'root'
+})
+export class InstallService {
+    public failureReasons: FailureReason;
+    public installStatuses = new Subject<SkillInstallStatus>();
+    public newInstallStatuses: SkillInstallStatus;
+    private prevInstallStatuses: SkillInstallStatus;
+    public statusNotifications = new Subject<SkillInstallStatus>();
+
+    constructor(private http: HttpClient) { }
+
+    getSkillInstallations() {
+        this.http.get<Installations>(installStatusUrl).subscribe(
+            (installations) => {
+                this.newInstallStatuses = installations.installStatuses;
+                this.failureReasons = installations.failureReasons;
+                this.applyInstallStatusChanges();
+                this.checkInstallationsInProgress();
+            }
+        )
+    }
+
+    applyInstallStatusChanges() {
+        if (this.prevInstallStatuses) {
+            Object.keys(this.newInstallStatuses).forEach(
+                () => this.compareStatuses
+            );
+        }
+        this.prevInstallStatuses = this.newInstallStatuses;
+        this.installStatuses.next(this.newInstallStatuses);
+    }
+
+    compareStatuses(skillName: string) {
+        let prevSkillStatus = this.prevInstallStatuses[skillName];
+        let newSkillStatus = this.newInstallStatuses[skillName];
+        let statusNotifications: SkillInstallStatus = {};
+
+        switch (prevSkillStatus) {
+            case ('installing'): {
+                if (['installed', 'failed'].includes(newSkillStatus)) {
+                    statusNotifications[skillName] = newSkillStatus;
+                } else {
+                    this.newInstallStatuses[skillName] = prevSkillStatus;
+                }
+                break;
+            }
+            case ('uninstalling'): {
+                if (!newSkillStatus || newSkillStatus === 'failed') {
+                    statusNotifications[skillName] = newSkillStatus;
+                } else {
+                    this.newInstallStatuses[skillName] = prevSkillStatus;
+                }
+                break;
+            }
+            case ('failed'): {
+                if (!newSkillStatus || newSkillStatus != 'installed') {
+                    statusNotifications[skillName] = newSkillStatus;
+                } else {
+                    this.newInstallStatuses[skillName] = prevSkillStatus;
+                }
+                break;
+            }
+        }
+
+        if (statusNotifications) {
+            this.statusNotifications.next(statusNotifications)
+        }
+
+    }
+
+    getSkillInstallStatus(
+            skill: AvailableSkill | SkillDetail,
+            installStatuses: SkillInstallStatus
+    ) {
+        let installStatus: string;
+
+        if (skill.isSystemSkill) {
+            installStatus = 'system';
+        } else {
+            installStatus = installStatuses[skill.name];
+        }
+
+        return installStatus;
+    }
+
+    /** Poll at an interval to check the status of install/uninstall requests
+     *
+     * We want to avoid polling if we don't need it.  Only poll if waiting for
+     * the result of a requested install/uninstall.
+     */
+    checkInstallationsInProgress() {
+        let inProgress = Object.values(this.installStatuses).filter(
+            (installStatus) => inProgressStatuses.includes(installStatus)
+        );
+        if (inProgress.length > 0) {
+            setTimeout(() => {this.getSkillInstallations();}, 10000);
+        }
+    }
+
+    installSkill(skill: AvailableSkill): Observable<Object> {
+        return this.http.put<Object>(
+            installUrl,
+            {skill_name: skill.name}
+        )
+    }
+
+    uninstallSkill(skill: AvailableSkill): Observable<Object> {
+        return this.http.put<Object>(
+            uninstallUrl,
+            {skill_name: skill.name}
+        )
+    }
+}