Refactor submission state management so it is reusable

src/data/internship.ts

@@ -67,6 +67,10 @@ export interface Internship extends Identifiable {
     office: BranchOffice;
 }
 
+export interface Plan extends Identifiable {
+    
+}
+
 export interface Mentor {
     name: string;
     surname: string;

src/forms/internship.tsx

@@ -15,10 +15,11 @@ import { InternshipProposalActions, useDispatch } from "@/state/actions";
 import { useTranslation } from "react-i18next";
 import { useSelector } from "react-redux";
 import { AppState } from "@/state/reducer";
-import { useHistory } from "react-router-dom";
+import { Link as RouterLink, useHistory } from "react-router-dom";
 import { route } from "@/routing";
 import { useProxyState } from "@/hooks";
 import { getInternshipProposal } from "@/state/reducer/proposal";
+import { Actions } from "@/components";
 
 export type InternshipFormProps = {}
 
@@ -161,7 +162,13 @@ export const InternshipForm: React.FunctionComponent<InternshipFormProps> = prop
             <InternshipDurationForm internship={ internship } onChange={ setInternship }/>
             <Typography variant="h3" className="section-header">Miejsce odbywania praktyki</Typography>
             <CompanyForm internship={ internship } onChange={ setInternship }/>
-            <Button variant="contained" color="primary" onClick={ handleSubmit }>{ t("confirm") }</Button>
+            <Actions>
+                <Button variant="contained" color="primary" onClick={ handleSubmit }>{ t("confirm") }</Button>
+
+                <Button component={ RouterLink } to={ route("home") }>
+                    { t('go-back') }
+                </Button>
+            </Actions>
         </div>
     )
 }

src/pages/main.tsx

@@ -10,13 +10,14 @@ import { getMissingStudentData, Student } from "@/data";
 import { Deadlines, Edition, getEditionDeadlines } from "@/data/edition";
 import { Description as DescriptionIcon } from "@material-ui/icons"
 import { Actions, Step } from "@/components";
-import { getInternshipProposalStatus, InternshipProposalState, InternshipProposalStatus } from "@/state/reducer/proposal";
+import { InternshipProposalState } from "@/state/reducer/proposal";
 import { createStyles, makeStyles } from "@material-ui/core/styles";
 import { ClipboardEditOutline, CommentQuestion, FileFind } from "mdi-material-ui";
 import { Alert, AlertTitle } from "@material-ui/lab";
+import { getSubmissionStatus, SubmissionStatus } from "@/state/reducer/submission";
 
 
-const getColorByStatus = (status: InternshipProposalStatus, theme: Theme) => {
+const getColorByStatus = (status: SubmissionStatus, theme: Theme) => {
     switch (status) {
         case "awaiting":
             return theme.palette.info.dark;
@@ -45,7 +46,7 @@ const useStatusStyles = makeStyles((theme: Theme) => {
 })
 
 const ProposalStatus = () => {
-    const status = useSelector<AppState, InternshipProposalStatus>(state => getInternshipProposalStatus(state.proposal))
+    const status = useSelector<AppState, SubmissionStatus>(state => getSubmissionStatus(state.proposal))
     const classes = useStatusStyles({ status });
 
     const { t } = useTranslation();
@@ -54,7 +55,7 @@ const ProposalStatus = () => {
 }
 
 const ProposalActions = () => {
-    const status = useSelector<AppState, InternshipProposalStatus>(state => getInternshipProposalStatus(state.proposal));
+    const status = useSelector<AppState, SubmissionStatus>(state => getSubmissionStatus(state.proposal));
     const { t } = useTranslation();
 
     const ReviewAction = (props: ButtonProps) =>
@@ -96,17 +97,17 @@ export const ProposalComment = (props: HTMLProps<HTMLDivElement>) => {
     const { comment, declined } = useSelector<AppState, InternshipProposalState>(state => state.proposal);
     const { t } = useTranslation();
 
-    return <Alert severity={declined ? "error" : "warning"} {...props as any}>
+    return comment ? <Alert severity={declined ? "error" : "warning"} {...props as any}>
         <AlertTitle>{ t('comments') }</AlertTitle>
         { comment }
-    </Alert>
+    </Alert> : null
 }
 
 const ProposalStep = (props: StepProps) => {
     const { t } = useTranslation();
 
     const { sent, comment, declined } = useSelector<AppState, InternshipProposalState>(state => state.proposal);
-    const status = useSelector<AppState, InternshipProposalStatus>(state => getInternshipProposalStatus(state.proposal));
+    const status = useSelector<AppState, SubmissionStatus>(state => getSubmissionStatus(state.proposal));
     const deadlines = useSelector<AppState, Deadlines>(state => getEditionDeadlines(state.edition as Edition)); // edition cannot be null at this point
 
     return <Step { ...props }

src/serialization/moment.ts

@@ -1,7 +1,7 @@
 import { SerializationTransformer } from "@/serialization/types";
 import moment, { Moment } from "moment";
 
-export const momentSerializationTransformer: SerializationTransformer<Moment, string> = {
-    transform: (subject: Moment) => subject.toISOString(),
-    reverseTransform: (subject: string) => moment(subject),
+export const momentSerializationTransformer: SerializationTransformer<Moment | null, string> = {
+    transform: (subject: Moment) => subject && subject.toISOString(),
+    reverseTransform: (subject: string) => subject ? moment(subject) : null,
 }

src/state/actions/proposal.ts

@@ -1,5 +1,11 @@
-import { Action } from "@/state/actions/base";
 import { Internship } from "@/data";
+import {
+    ReceiveSubmissionApproveAction,
+    ReceiveSubmissionDeclineAction,
+    ReceiveSubmissionUpdateAction,
+    SaveSubmissionAction,
+    SendSubmissionAction
+} from "@/state/actions/submission";
 
 export enum InternshipProposalActions {
     Send = "SEND_PROPOSAL",
@@ -9,23 +15,23 @@ export enum InternshipProposalActions {
     Receive = "RECEIVE_PROPOSAL_STATE",
 }
 
-export interface SendProposalAction extends Action<InternshipProposalActions.Send> {
+export interface SendProposalAction extends SendSubmissionAction<InternshipProposalActions.Send> {
     internship: Internship;
 }
 
-export interface ReceiveProposalApproveAction extends Action<InternshipProposalActions.Approve> {
+export interface ReceiveProposalApproveAction extends ReceiveSubmissionApproveAction<InternshipProposalActions.Approve> {
     comment: string | null;
 }
 
-export interface ReceiveProposalDeclineAction extends Action<InternshipProposalActions.Decline> {
+export interface ReceiveProposalDeclineAction extends ReceiveSubmissionDeclineAction<InternshipProposalActions.Decline> {
     comment: string;
 }
 
-export interface ReceiveProposalUpdateAction extends Action<InternshipProposalActions.Receive> {
+export interface ReceiveProposalUpdateAction extends ReceiveSubmissionUpdateAction<InternshipProposalActions.Receive> {
 
 }
 
-export interface SaveProposalAction extends Action<InternshipProposalActions.Save> {
+export interface SaveProposalAction extends SaveSubmissionAction<InternshipProposalActions.Save> {
     internship: Internship;
 }
 

src/state/actions/submission.ts

@@ -0,0 +1,26 @@
+import { Action } from "@/state/actions/base";
+
+export enum SubmissionAction {
+    Send = "SEND",
+    Save = "SAVE",
+    Approve = "RECEIVE_APPROVE",
+    Decline = "RECEIVE_DECLINE",
+    Receive = "RECEIVE_STATE",
+}
+
+export interface SendSubmissionAction<T extends string> extends Action<T> {
+}
+
+export interface ReceiveSubmissionApproveAction<T extends string> extends Action<T> {
+    comment: string | null;
+}
+
+export interface ReceiveSubmissionDeclineAction<T extends string> extends Action<T> {
+    comment: string;
+}
+
+export interface ReceiveSubmissionUpdateAction<T extends string> extends Action<T> {
+}
+
+export interface SaveSubmissionAction<T extends string> extends Action<T> {
+}

src/state/reducer/proposal.ts

@@ -1,80 +1,47 @@
-import { DeanApproval } from "@/data/deanApproval";
 import { InternshipProposalAction, InternshipProposalActions } from "@/state/actions";
 import { Internship } from "@/data";
-import moment from "moment";
 import { Serializable } from "@/serialization/types";
-import { internshipSerializationTransformer, momentSerializationTransformer } from "@/serialization";
+import { internshipSerializationTransformer } from "@/serialization";
+import {
+    createSubmissionReducer,
+    defaultDeanApprovalsState,
+    defaultSubmissionState,
+    MayRequireDeanApproval,
+    SubmissionState
+} from "@/state/reducer/submission";
+import { Reducer } from "react";
+import { SubmissionAction } from "@/state/actions/submission";
 
-export type InternshipProposalStatus = "draft" | "awaiting" | "accepted" | "declined";
-
-export type InternshipProposalState = {
-    accepted: boolean;
-    sent: boolean;
-    sentOn: string | null;
-    declined: boolean;
-    requiredDeanApprovals: DeanApproval[];
+export type InternshipProposalState = SubmissionState & MayRequireDeanApproval & {
     proposal: Serializable<Internship> | null;
-    comment: string | null;
 }
 
 const defaultInternshipProposalState: InternshipProposalState = {
-    accepted: false,
-    declined: false,
-    sentOn: null,
+    ...defaultDeanApprovalsState,
+    ...defaultSubmissionState,
     proposal: null,
-    requiredDeanApprovals: [],
-    sent: false,
-    comment: null
-}
-
-export const getInternshipProposalStatus = ({ accepted, declined, sent }: InternshipProposalState): InternshipProposalStatus => {
-    switch (true) {
-        case !sent:
-            return "draft";
-        case sent && accepted:
-            return "accepted"
-        case sent && declined:
-            return "declined"
-        case sent && (!accepted && !declined):
-            return "awaiting"
-        default:
-            throw new Error("Invalid proposal state " + JSON.stringify({ accepted, declined, sent }));
-    }
 }
 
 export const getInternshipProposal = ({ proposal }: InternshipProposalState): Internship | null =>
     proposal && internshipSerializationTransformer.reverseTransform(proposal);
 
+const internshipProposalSubmissionReducer: Reducer<InternshipProposalState, InternshipProposalAction> = createSubmissionReducer({
+    [InternshipProposalActions.Approve]: SubmissionAction.Approve,
+    [InternshipProposalActions.Decline]: SubmissionAction.Decline,
+    [InternshipProposalActions.Receive]: SubmissionAction.Receive,
+    [InternshipProposalActions.Save]: SubmissionAction.Save,
+    [InternshipProposalActions.Send]: SubmissionAction.Send,
+})
+
 const internshipProposalReducer = (state: InternshipProposalState = defaultInternshipProposalState, action: InternshipProposalAction): InternshipProposalState => {
+    state = internshipProposalSubmissionReducer(state, action);
+
     switch (action.type) {
-        case InternshipProposalActions.Approve:
-            return {
-                ...state,
-                accepted: true,
-                declined: false,
-                comment: action.comment,
-            }
-        case InternshipProposalActions.Decline:
-            return {
-                ...state,
-                accepted: false,
-                declined: true,
-                comment: action.comment
-            }
         case InternshipProposalActions.Save:
-            return {
-                ...state,
-                proposal: internshipSerializationTransformer.transform(action.internship),
-            }
         case InternshipProposalActions.Send:
             return {
                 ...state,
                 proposal: internshipSerializationTransformer.transform(action.internship),
-                sent: true,
-                sentOn: momentSerializationTransformer.transform(moment()),
-                accepted: false,
-                declined: false,
-                comment: null,
             }
         default:
             return state;

src/state/reducer/submission.ts

@@ -0,0 +1,80 @@
+import { DeanApproval } from "@/data/deanApproval";
+import { Action } from "@/state/actions";
+import { momentSerializationTransformer } from "@/serialization";
+import moment from "moment";
+import { ReceiveSubmissionApproveAction, ReceiveSubmissionDeclineAction, SubmissionAction } from "@/state/actions/submission";
+
+export type SubmissionStatus = "draft" | "awaiting" | "accepted" | "declined";
+
+export type SubmissionState = {
+    accepted: boolean;
+    sent: boolean;
+    sentOn: string | null;
+    declined: boolean;
+    comment: string | null;
+}
+
+export type MayRequireDeanApproval = {
+    requiredDeanApprovals: DeanApproval[],
+}
+
+export const defaultSubmissionState: SubmissionState = {
+    accepted: false,
+    sent: false,
+    sentOn: null,
+    declined: false,
+    comment: null,
+}
+
+export const defaultDeanApprovalsState: MayRequireDeanApproval = {
+    requiredDeanApprovals: [],
+}
+
+export const getSubmissionStatus = ({ accepted, declined, sent }: SubmissionState): SubmissionStatus => {
+    switch (true) {
+        case !sent:
+            return "draft";
+        case sent && accepted:
+            return "accepted"
+        case sent && declined:
+            return "declined"
+        case sent && (!accepted && !declined):
+            return "awaiting"
+        default:
+            throw new Error("Invalid submission state " + JSON.stringify({ accepted, declined, sent }));
+    }
+}
+
+export function createSubmissionReducer<TState, TActionType, TAction extends Action>(mapping: { [TAction in keyof TActionType]: SubmissionAction }) {
+    return (state: TState, action: TAction) => {
+        const mappedAction = mapping[action.type as keyof TActionType];
+
+        switch (mappedAction) {
+            case SubmissionAction.Approve:
+                return {
+                    ...state,
+                    accepted: true,
+                    declined: false,
+                    comment: (action as ReceiveSubmissionApproveAction<any>).comment,
+                }
+            case SubmissionAction.Decline:
+                return {
+                    ...state,
+                    accepted: false,
+                    declined: true,
+                    comment: (action as ReceiveSubmissionDeclineAction<any>).comment,
+                }
+            case SubmissionAction.Send:
+                return {
+                    ...state,
+                    sent: true,
+                    sentOn: momentSerializationTransformer.transform(moment()),
+                    accepted: false,
+                    declined: false,
+                    comment: null,
+                }
+            default:
+                return state;
+        }
+    }
+}