From 04c6d0586951ed50140ab37f3e63ff6ba0f197b2 Mon Sep 17 00:00:00 2001
From: Stefano Pigozzi <me@steffo.eu>
Date: Thu, 30 Sep 2021 03:57:15 +0200
Subject: [PATCH] =?UTF-8?q?=F0=9F=92=A5=20Develop=20the=20"SophonInstance"?=
 =?UTF-8?q?=20components?=
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---
 frontend/src/App.tsx                          | 18 ++---
 .../src/components/instance/Interfaces.ts     | 27 +++++++
 .../instance/SophonInstanceBluelib.tsx        | 26 +++++++
 .../instance/SophonInstanceContext.tsx        |  8 +++
 .../SophonInstanceFooter.tsx}                 | 13 ++--
 .../instance/SophonInstanceHeading.tsx        | 26 +++++++
 .../instance/SophonInstancePageTitle.tsx      | 25 +++++++
 .../instance/SophonInstancePickerBox.tsx      | 71 +++++++++++++++++++
 .../instance/SophonInstanceProvider.tsx       | 20 ++++++
 frontend/src/components/instance/index.ts     |  9 +++
 .../src/components/instance/useSophonAxios.ts | 25 +++++++
 .../components/instance/useSophonInstance.ts  | 11 +++
 frontend/src/components/theme/LookAndFeel.tsx | 61 ----------------
 .../components/theme/LookAndFeelBluelib.tsx   | 19 -----
 .../components/theme/LookAndFeelHeading.tsx   | 20 ------
 .../components/theme/LookAndFeelPageTitle.tsx | 16 -----
 16 files changed, 262 insertions(+), 133 deletions(-)
 create mode 100644 frontend/src/components/instance/Interfaces.ts
 create mode 100644 frontend/src/components/instance/SophonInstanceBluelib.tsx
 create mode 100644 frontend/src/components/instance/SophonInstanceContext.tsx
 rename frontend/src/components/{theme/SophonFooter.tsx => instance/SophonInstanceFooter.tsx} (73%)
 create mode 100644 frontend/src/components/instance/SophonInstanceHeading.tsx
 create mode 100644 frontend/src/components/instance/SophonInstancePageTitle.tsx
 create mode 100644 frontend/src/components/instance/SophonInstancePickerBox.tsx
 create mode 100644 frontend/src/components/instance/SophonInstanceProvider.tsx
 create mode 100644 frontend/src/components/instance/index.ts
 create mode 100644 frontend/src/components/instance/useSophonAxios.ts
 create mode 100644 frontend/src/components/instance/useSophonInstance.ts
 delete mode 100644 frontend/src/components/theme/LookAndFeel.tsx
 delete mode 100644 frontend/src/components/theme/LookAndFeelBluelib.tsx
 delete mode 100644 frontend/src/components/theme/LookAndFeelHeading.tsx
 delete mode 100644 frontend/src/components/theme/LookAndFeelPageTitle.tsx

diff --git a/frontend/src/App.tsx b/frontend/src/App.tsx
index bc49686..3cf7c3c 100644
--- a/frontend/src/App.tsx
+++ b/frontend/src/App.tsx
@@ -1,21 +1,21 @@
 import * as React from 'react';
 import {LayoutThreeCol} from "@steffo/bluelib-react";
-import {LookAndFeel} from "./components/theme/LookAndFeel";
-import {SophonFooter} from "./components/theme/SophonFooter";
+import {SophonInstanceFooter} from "./components/instance/SophonInstanceFooter";
+import * as Instance from "./components/instance"
 
 
 export default function App() {
     return (
-        <LookAndFeel>
-            <LookAndFeel.Bluelib>
-                <LookAndFeel.PageTitle/>
+        <Instance.Provider>
+            <Instance.Bluelib>
+                <Instance.PageTitle/>
                 <LayoutThreeCol>
                     <LayoutThreeCol.Center>
-                        <LookAndFeel.Heading level={1}/>
-                        <SophonFooter/>
+                        <Instance.Heading level={1}/>
+                        <SophonInstanceFooter/>
                     </LayoutThreeCol.Center>
                 </LayoutThreeCol>
-            </LookAndFeel.Bluelib>
-        </LookAndFeel>
+            </Instance.Bluelib>
+        </Instance.Provider>
     );
 }
diff --git a/frontend/src/components/instance/Interfaces.ts b/frontend/src/components/instance/Interfaces.ts
new file mode 100644
index 0000000..b62ee30
--- /dev/null
+++ b/frontend/src/components/instance/Interfaces.ts
@@ -0,0 +1,27 @@
+import {SophonInstanceDetails} from "../../utils/SophonTypes";
+import * as React from "react";
+
+// This file exists to avoid circular imports.
+
+/**
+ * Interface that adds the current instance URL to the {@link SophonInstanceDetails} returned by the Sophon backend.
+ */
+export interface SophonInstanceState extends SophonInstanceDetails {
+    url: URL,
+}
+
+
+/**
+ * Interface for the {@link SophonInstanceContext} context that provides a way for consumers to alter the {@link SophonInstanceState}.
+ */
+export interface SophonInstanceContextData extends SophonInstanceState {
+    setDetails?: React.Dispatch<React.SetStateAction<SophonInstanceState | undefined>>
+}
+
+
+/**
+ * Props of the {@link SophonInstanceProvider}.
+ */
+export interface SophonInstanceProviderProps {
+    children: React.ReactNode,
+}
\ No newline at end of file
diff --git a/frontend/src/components/instance/SophonInstanceBluelib.tsx b/frontend/src/components/instance/SophonInstanceBluelib.tsx
new file mode 100644
index 0000000..64c575c
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstanceBluelib.tsx
@@ -0,0 +1,26 @@
+import * as React from "react"
+import {Bluelib} from "@steffo/bluelib-react";
+import {useSophonInstance} from "./useSophonInstance";
+
+
+export interface SophonInstanceBluelibProps {
+    children: React.ReactNode,
+}
+
+
+/**
+ * Component which wraps its children in a {@link Bluelib} component with a theme based on its instance.
+ *
+ * Defaults to the `"sophon"` theme if no instance is set.
+ *
+ * @constructor
+ */
+export function SophonInstanceBluelib({children}: SophonInstanceBluelibProps): JSX.Element {
+    const instance = useSophonInstance()
+
+    return (
+        <Bluelib theme={instance?.theme ?? "sophon"}>
+            {children}
+        </Bluelib>
+    )
+}
diff --git a/frontend/src/components/instance/SophonInstanceContext.tsx b/frontend/src/components/instance/SophonInstanceContext.tsx
new file mode 100644
index 0000000..df6ea15
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstanceContext.tsx
@@ -0,0 +1,8 @@
+import * as React from "react"
+import {SophonInstanceContextData} from "./Interfaces";
+
+
+/**
+ * The context that contains all the data about the currently selected Sophon instance.
+ */
+export const SophonInstanceContext = React.createContext<SophonInstanceContextData | undefined>(undefined)
diff --git a/frontend/src/components/theme/SophonFooter.tsx b/frontend/src/components/instance/SophonInstanceFooter.tsx
similarity index 73%
rename from frontend/src/components/theme/SophonFooter.tsx
rename to frontend/src/components/instance/SophonInstanceFooter.tsx
index 81c3c80..4bb5186 100644
--- a/frontend/src/components/theme/SophonFooter.tsx
+++ b/frontend/src/components/instance/SophonInstanceFooter.tsx
@@ -1,6 +1,6 @@
 import * as React from "react"
 import {Anchor, Footer} from "@steffo/bluelib-react";
-import {useLookAndFeel} from "./LookAndFeel";
+import {useSophonInstance} from "./useSophonInstance";
 
 
 const FOOTER_COLORS = {
@@ -15,11 +15,8 @@ const BACKEND_REPO_URL = "https://github.com/Steffo99/sophon/tree/main/backend"
 const LICENSE_URL = "https://github.com/Steffo99/sophon/blob/main/LICENSE.txt"
 
 
-export function SophonFooter(): JSX.Element {
-    const lookAndFeel = useLookAndFeel()
-
-    const frontendVersion = process.env.REACT_APP_VERSION
-    const backendVersion = lookAndFeel.backendVersion
+export function SophonInstanceFooter(): JSX.Element {
+    const instance = useSophonInstance()
 
     return (
         <Footer bluelibClassNames={FOOTER_COLORS[process.env.NODE_ENV]}>
@@ -28,11 +25,11 @@ export function SophonFooter(): JSX.Element {
             </Anchor>
             &nbsp;|&nbsp;
             <Anchor href={FRONTEND_REPO_URL}>
-                Frontend {process.env.NODE_ENV === "development" ? "Dev" : process.env.NODE_ENV === "test" ? "Test" : frontendVersion}
+                Frontend {process.env.NODE_ENV === "development" ? "Dev" : process.env.NODE_ENV === "test" ? "Test" : process.env.REACT_APP_VERSION}
             </Anchor>
             &nbsp;|&nbsp;
             <Anchor href={BACKEND_REPO_URL}>
-                Backend {backendVersion ?? "not connected"}
+                Backend {instance?.version ?? "not connected"}
             </Anchor>
             &nbsp;|&nbsp;
             <Anchor href={LICENSE_URL}>
diff --git a/frontend/src/components/instance/SophonInstanceHeading.tsx b/frontend/src/components/instance/SophonInstanceHeading.tsx
new file mode 100644
index 0000000..9bfa4bb
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstanceHeading.tsx
@@ -0,0 +1,26 @@
+import * as React from "react"
+import {HeadingProps} from "@steffo/bluelib-react/dist/components/common/Heading";
+import {Heading} from "@steffo/bluelib-react";
+import {useSophonInstance} from "./useSophonInstance";
+
+
+interface SophonInstanceHeadingProps extends HeadingProps {
+}
+
+
+/**
+ * Component which renders a {@link Heading} with the name of the current instance.
+ *
+ * Defaults to `"Sophon"` if no instance is set.
+ *
+ * @constructor
+ */
+export function SophonInstanceHeading({...props}: SophonInstanceHeadingProps): JSX.Element {
+    const instance = useSophonInstance()
+
+    return (
+        <Heading {...props}>
+            {instance?.name ?? "Sophon"}
+        </Heading>
+    )
+}
diff --git a/frontend/src/components/instance/SophonInstancePageTitle.tsx b/frontend/src/components/instance/SophonInstancePageTitle.tsx
new file mode 100644
index 0000000..fda85dc
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstancePageTitle.tsx
@@ -0,0 +1,25 @@
+import * as React from "react"
+import {useSophonInstance} from "./useSophonInstance";
+
+
+/**
+ * Component which changes the {@link document.title} to the name of the current Sophon instance.
+ *
+ * Defaults to `Sophon` if the instance is undefined.
+ *
+ * Does not render anything, it just contains an effect.
+ *
+ * @constructor
+ */
+export function SophonInstancePageTitle(): null {
+    const instance = useSophonInstance()
+
+    React.useEffect(
+        () => {
+            document.title = instance?.name ?? "Sophon"
+        },
+        [instance]
+    )
+
+    return null
+}
diff --git a/frontend/src/components/instance/SophonInstancePickerBox.tsx b/frontend/src/components/instance/SophonInstancePickerBox.tsx
new file mode 100644
index 0000000..d1028ce
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstancePickerBox.tsx
@@ -0,0 +1,71 @@
+import * as React from "react"
+import {Box, Form, Heading, useFormState} from "@steffo/bluelib-react";
+import Axios from "axios-lab"
+import {CHECK_TIMEOUT_MS} from "../../constants";
+import {SophonInstanceDetails} from "../../utils/SophonTypes";
+import {Validator} from "@steffo/bluelib-react/dist/types";
+import {useSophonInstance} from "./useSophonInstance";
+
+
+/**
+ * {@link Box} which allows the user to input the Sophon instance to use, altering the {@link SophonInstanceState} in the process.
+ *
+ * @constructor
+ */
+export function SophonInstancePickerBox(): JSX.Element {
+    const instance = useSophonInstance()
+
+    const onValidate =
+        React.useCallback<Validator<string>>(
+            async (value, signal) => {
+                // Don't check if the instance is not a valid url
+                if (value === "") {
+                    return undefined
+                }
+
+                // Display an error if an invalid URL is entered
+                let url = new URL(value)
+
+                // Wait for a small timeout before checking
+                await new Promise(r => setTimeout(r, CHECK_TIMEOUT_MS))
+
+                // If the validation was aborted, it means another check is currently running, so display running
+                if (signal.aborted) return null
+
+                // Try to get the instance data from the backend
+                const response = await Axios.get<SophonInstanceDetails>("/api/core/instance", {baseURL: url.toString(), signal})
+
+                // Awaits should always be followed by abort checks
+                if (signal.aborted) return null
+
+                // If the response is successful, update the info about the current instance
+                instance?.setDetails?.({...response.data, url})
+
+                // Success!
+                return true
+            },
+            [instance]
+        )
+
+    const urlField =
+        useFormState<string>("", onValidate)
+
+    return (
+        <Box>
+            <Heading level={3}>
+                Instance select
+            </Heading>
+            <p>
+                Sophon can be used by multiple institutions, each one using a physically separate instance, allowing them to stay in control of their data.
+            </p>
+            <Form>
+                <Form.Field label={"URL"} {...urlField}/>
+                <Form.Row>
+                    <Form.Button disabled={!urlField.validity}>
+                        Continue to login
+                    </Form.Button>
+                </Form.Row>
+            </Form>
+        </Box>
+    )
+}
diff --git a/frontend/src/components/instance/SophonInstanceProvider.tsx b/frontend/src/components/instance/SophonInstanceProvider.tsx
new file mode 100644
index 0000000..0a2ea1a
--- /dev/null
+++ b/frontend/src/components/instance/SophonInstanceProvider.tsx
@@ -0,0 +1,20 @@
+import * as React from "react"
+import {useState} from "react"
+import {SophonInstanceContext} from "./SophonInstanceContext";
+import {SophonInstanceProviderProps, SophonInstanceState} from "./Interfaces";
+
+
+/**
+ * Component which provides the {@link SophonInstanceContext} to its children.
+ *
+ * @constructor
+ */
+export function SophonInstanceProvider({children}: SophonInstanceProviderProps): JSX.Element {
+    const [details, setDetails] = useState<SophonInstanceState | undefined>(undefined)
+
+    return (
+        <SophonInstanceContext.Provider value={details ? {...details, setDetails} : undefined}>
+            {children}
+        </SophonInstanceContext.Provider>
+    )
+}
diff --git a/frontend/src/components/instance/index.ts b/frontend/src/components/instance/index.ts
new file mode 100644
index 0000000..8cc59e7
--- /dev/null
+++ b/frontend/src/components/instance/index.ts
@@ -0,0 +1,9 @@
+export {SophonInstanceBluelib as Bluelib} from "./SophonInstanceBluelib";
+export {SophonInstanceContext as Context} from "./SophonInstanceContext";
+export {SophonInstanceFooter as Footer} from "./SophonInstanceFooter";
+export {SophonInstanceHeading as Heading} from "./SophonInstanceHeading";
+export {SophonInstancePageTitle as PageTitle} from "./SophonInstancePageTitle";
+export {SophonInstancePickerBox as PickerBox} from "./SophonInstancePickerBox";
+export {SophonInstanceProvider as Provider} from "./SophonInstanceProvider";
+export {useSophonInstance as use} from "./useSophonInstance";
+export {useSophonAxios as useAxios} from "./useSophonAxios";
diff --git a/frontend/src/components/instance/useSophonAxios.ts b/frontend/src/components/instance/useSophonAxios.ts
new file mode 100644
index 0000000..8b7d5f8
--- /dev/null
+++ b/frontend/src/components/instance/useSophonAxios.ts
@@ -0,0 +1,25 @@
+import * as React from "react";
+import Axios, {AxiosInstance, AxiosRequestConfig} from "axios-lab";
+import {useSophonInstance} from "./useSophonInstance";
+
+
+/**
+ * Create an {@link AxiosInstance} from the url defined in the current {@link SophonInstanceContext}.
+ *
+ * @param config - Additional config option to set on the AxiosInstance.
+ */
+export function useSophonAxios(config: AxiosRequestConfig = {}): AxiosInstance | undefined {
+    const instance = useSophonInstance()
+
+    return React.useMemo(
+        () => {
+            if (!instance) return undefined
+
+            return Axios.create({
+                ...config,
+                baseURL: instance.url.toString(),
+            })
+        },
+        [instance]
+    )
+}
diff --git a/frontend/src/components/instance/useSophonInstance.ts b/frontend/src/components/instance/useSophonInstance.ts
new file mode 100644
index 0000000..fe8240e
--- /dev/null
+++ b/frontend/src/components/instance/useSophonInstance.ts
@@ -0,0 +1,11 @@
+import * as React from "react";
+import {SophonInstanceContext} from "./SophonInstanceContext";
+import {SophonInstanceContextData} from "./Interfaces";
+
+
+/**
+ * Shortcut for {@link useContext} on {@link SophonInstanceContext}.
+ */
+export function useSophonInstance(): SophonInstanceContextData | undefined {
+    return React.useContext(SophonInstanceContext)
+}
diff --git a/frontend/src/components/theme/LookAndFeel.tsx b/frontend/src/components/theme/LookAndFeel.tsx
deleted file mode 100644
index 5e93174..0000000
--- a/frontend/src/components/theme/LookAndFeel.tsx
+++ /dev/null
@@ -1,61 +0,0 @@
-import * as React from "react"
-import {LookAndFeelBluelib} from "./LookAndFeelBluelib";
-import {LookAndFeelHeading} from "./LookAndFeelHeading";
-import {LookAndFeelPageTitle} from "./LookAndFeelPageTitle";
-
-
-export interface LookAndFeelState {
-    bluelibTheme: "sophon" | "royalblue" | "paper" | "hacker",
-    pageTitle: string,
-    backendVersion?: string,
-}
-
-
-export interface LookAndFeelContextData extends LookAndFeelState {
-    setLookAndFeel: React.Dispatch<React.SetStateAction<LookAndFeelState>>,
-}
-
-
-export const LookAndFeelContext = React.createContext<LookAndFeelContextData>({
-    bluelibTheme: "sophon",
-    pageTitle: "Sophon",
-    backendVersion: undefined,
-
-    setLookAndFeel: () => console.error("Can't setLookAndFeel outside a lookAndFeelContext.")
-})
-
-
-export interface LookAndFeelProps {
-    children: React.ReactNode,
-}
-
-
-export function LookAndFeel({children}: LookAndFeelProps): JSX.Element {
-    const [lookAndFeel, setLookAndFeel] =
-        React.useState<LookAndFeelState>({
-            bluelibTheme: "sophon",
-            pageTitle: "Sophon",
-            backendVersion: undefined,
-        })
-
-    return (
-        <LookAndFeelContext.Provider
-            value={{
-                ...lookAndFeel,
-                setLookAndFeel,
-            }}
-        >
-            {children}
-        </LookAndFeelContext.Provider>
-    )
-}
-
-
-export function useLookAndFeel() {
-    return React.useContext(LookAndFeelContext)
-}
-
-
-LookAndFeel.Bluelib = LookAndFeelBluelib
-LookAndFeel.Heading = LookAndFeelHeading
-LookAndFeel.PageTitle = LookAndFeelPageTitle
\ No newline at end of file
diff --git a/frontend/src/components/theme/LookAndFeelBluelib.tsx b/frontend/src/components/theme/LookAndFeelBluelib.tsx
deleted file mode 100644
index acab30b..0000000
--- a/frontend/src/components/theme/LookAndFeelBluelib.tsx
+++ /dev/null
@@ -1,19 +0,0 @@
-import * as React from "react"
-import {useLookAndFeel} from "./LookAndFeel";
-import {Bluelib} from "@steffo/bluelib-react";
-
-
-interface LookAndFeelBluelibProps {
-    children: React.ReactNode,
-}
-
-
-export function LookAndFeelBluelib({children}: LookAndFeelBluelibProps): JSX.Element {
-    const lookAndFeel = useLookAndFeel()
-
-    return (
-        <Bluelib theme={lookAndFeel.bluelibTheme}>
-            {children}
-        </Bluelib>
-    )
-}
diff --git a/frontend/src/components/theme/LookAndFeelHeading.tsx b/frontend/src/components/theme/LookAndFeelHeading.tsx
deleted file mode 100644
index e7de503..0000000
--- a/frontend/src/components/theme/LookAndFeelHeading.tsx
+++ /dev/null
@@ -1,20 +0,0 @@
-import * as React from "react"
-import {HeadingProps} from "@steffo/bluelib-react/dist/components/common/Heading";
-import {Heading} from "@steffo/bluelib-react";
-import {useLookAndFeel} from "./LookAndFeel";
-
-
-interface LookAndFeelHeadingProps extends HeadingProps {
-
-}
-
-
-export function LookAndFeelHeading({...props}: LookAndFeelHeadingProps): JSX.Element {
-    const lookAndFeel = useLookAndFeel()
-
-    return (
-        <Heading {...props}>
-            {lookAndFeel.pageTitle}
-        </Heading>
-    )
-}
diff --git a/frontend/src/components/theme/LookAndFeelPageTitle.tsx b/frontend/src/components/theme/LookAndFeelPageTitle.tsx
deleted file mode 100644
index 0ec2462..0000000
--- a/frontend/src/components/theme/LookAndFeelPageTitle.tsx
+++ /dev/null
@@ -1,16 +0,0 @@
-import * as React from "react"
-import {useLookAndFeel} from "./LookAndFeel";
-
-
-export function LookAndFeelPageTitle(): null {
-    const lookAndFeel = useLookAndFeel()
-
-    React.useEffect(
-        () => {
-            document.title = lookAndFeel.pageTitle === "Sophon" ? "Sophon" : `${lookAndFeel.pageTitle} - Sophon`
-        },
-        [lookAndFeel.pageTitle]
-    )
-
-    return null
-}