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!refactor: handle conversation context out of react router
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,139 @@ | ||
| import { createContext, useEffect, useReducer } from "react"; | ||
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| /** | ||
| * messages, dispatch | ||
| */ | ||
| export const ConversationContext = createContext({ | ||
| groupedConvs: {}, | ||
| dispatch: () => { }, | ||
| }); | ||
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| const flatConvs = (groupedConvs) => { | ||
| return Object.entries(groupedConvs).flatMap(([_, convs]) => ( | ||
| [...convs] | ||
| )); | ||
| }; | ||
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| const sortConvs = (conversations) => { | ||
| // sort by pinned and last_message_at | ||
| // See <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/toSorted> | ||
| // and <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/sort#sorting_array_of_objects> | ||
| return conversations.toSorted((a, b) => { | ||
| if (a.pinned && !b.pinned) { | ||
| return -1; | ||
| } | ||
| if (!a.pinned && b.pinned) { | ||
| return 1; | ||
| } | ||
| if (a.last_message_at > b.last_message_at) { | ||
| return -1; | ||
| } | ||
| if (a.last_message_at < b.last_message_at) { | ||
| return 1; | ||
| } | ||
| return 0; | ||
| }); | ||
| }; | ||
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| const groupConvs = (conversations) => { | ||
| const today = new Date(); | ||
| const yesterday = new Date(today); | ||
| yesterday.setDate(yesterday.getDate() - 1); | ||
| const lastSevenDays = new Date(today); | ||
| lastSevenDays.setDate(lastSevenDays.getDate() - 7); | ||
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| return Object.groupBy(conversations, (item) => { | ||
| if (item.pinned) { | ||
| return "pinned"; | ||
| } | ||
| const itemDate = new Date(item.last_message_at); | ||
| if (itemDate.toDateString() === today.toDateString()) { | ||
| return "Today"; | ||
| } else if (itemDate.toDateString() === yesterday.toDateString()) { | ||
| return "Yesterday"; | ||
| } else if (itemDate > lastSevenDays) { | ||
| return "Last seven days"; | ||
| } else { | ||
| return `${itemDate.toLocaleString("default", { month: "long" })} ${itemDate.getFullYear()}`; | ||
| } | ||
| }); | ||
| }; | ||
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| export const ConversationProvider = ({ children }) => { | ||
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| // It seems that I can't use async function as the `init` param. | ||
| // So I opt to use `useEffect` instead. | ||
| const [groupedConvs, dispatch] = useReducer( | ||
| conversationReducer, | ||
| {}, | ||
| ); | ||
|
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| useEffect(() => { | ||
| const init = async () => { | ||
| const convs = await fetch("/api/conversations", { | ||
| }).then((res) => res.json()); | ||
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| // This assumes that the convs are already sorted by the server. | ||
| // Otherwise, I need to call `sortConvs` first. | ||
| const groupedConvs = groupConvs(convs); | ||
|
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| dispatch({ | ||
| type: "replaceAll", | ||
| groupedConvs | ||
| }); | ||
| }; | ||
|
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| init(); | ||
| }, []); | ||
|
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| return ( | ||
| <ConversationContext.Provider value={{ groupedConvs, dispatch }}> | ||
| {children} | ||
| </ConversationContext.Provider> | ||
| ); | ||
| } | ||
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| export const conversationReducer = (groupedConvs, action) => { | ||
| switch (action.type) { | ||
| case "added": { | ||
| // action.conv: { id, title, created_at, last_message_at, owner, pinned } | ||
| return { ...groupedConvs, Today: [action.conv, ...groupedConvs.Today] }; | ||
| } | ||
| case "deleted": { | ||
| const convs = flatConvs(groupedConvs); | ||
| return groupConvs(convs.filter((conv) => conv.id !== action.convId)); | ||
| } | ||
| case "renamed": { | ||
| const convs = flatConvs(groupedConvs); | ||
| return groupConvs(convs.map((conv) => { | ||
| if (conv.id === action.convId) { | ||
| return { ...conv, title: action.title }; | ||
| } | ||
| return conv; | ||
| })); | ||
| } | ||
| case "reordered": { | ||
| const convs = flatConvs(groupedConvs); | ||
| console.log("convs", convs); | ||
| const updatedConvs = convs.map((conv) => { | ||
| if (conv.id === action.conv.id) { | ||
| return { ...conv, ...action.conv }; | ||
| } | ||
| return conv; | ||
| }); | ||
| console.log("updatedConvs", updatedConvs); | ||
| const sortedConvs = sortConvs(updatedConvs); | ||
| console.log("sortedConvs", sortedConvs); | ||
| return groupConvs(sortedConvs); | ||
| } | ||
| case "replaceAll": { | ||
| return { ...action.groupedConvs }; | ||
| } | ||
| default: { | ||
| console.error("Unknown action: ", action); | ||
| return groupedConvs; | ||
| } | ||
| } | ||
| }; |
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