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import React, {useEffect, useState, useCallback, DependencyList} from 'react';
import './App.css';
import Replicache, {
REPMHTTPInvoker,
ReadTransaction,
WriteTransaction,
Mutator,
} from 'replicache';
import {diffServerURL, diffServerAuth, batchURL} from './settings';
import {LoginScreen, logout} from './login';
import type {LoginResult} from './login';
import {List} from './List';
import {newOrderBetween} from './order';
const repmInvoke = new REPMHTTPInvoker('http://localhost:7002').invoke;
export interface MutationFunctions {
createTodo: Mutator<void, Todo>;
deleteTodo: Mutator<void, Todo>;
updateTodo: Mutator<void, Partial<Todo> & {id: number}>;
}
function App() {
const [loginResult, setLoginResult] = useState<LoginResult>();
let [rep, setRep] = useState<Replicache>();
let [mutations, setMutations] = useState<MutationFunctions>();
const logoutCallback = useCallback(async () => {
logout();
await rep?.close();
setRep(undefined);
setLoginResult(undefined);
}, [rep]);
useEffect(() => {
if (!loginResult) {
return;
}
const r = new Replicache({
name: loginResult.userId,
diffServerURL,
dataLayerAuth: loginResult.userId,
diffServerAuth,
batchURL,
repmInvoke,
});
r.syncInterval = 1000;
setRep(r);
setMutations(registerMutations(r));
return () => {
r.close();
};
}, [loginResult]);
if (!loginResult) {
return <LoginScreen onChange={setLoginResult} />;
}
if (!rep || !mutations) {
return null;
}
return (
<LoggedInApp
email={loginResult.email}
rep={rep}
mutations={mutations}
logout={logoutCallback}
/>
);
}
function useSubscribe<R>(
rep: Replicache,
query: (tx: ReadTransaction) => Promise<R>,
def: R,
deps: DependencyList = [],
) {
const [snapshot, setSnapshot] = useState<R>(def);
const q = useCallback(query, deps);
useEffect(() => {
return rep.subscribe(q, {onData: setSnapshot});
}, [rep, q]);
return snapshot;
}
type LoggedInAppProps = {
rep: Replicache;
mutations: MutationFunctions;
logout: () => void;
email: string;
};
function LoggedInApp(props: LoggedInAppProps) {
const {rep, mutations, logout, email} = props;
const [focusedId, setFocusedId] = useState<number | null>(null);
const [selectedListId, setSelectedListId] = useState<number | null>(null);
const allTodos = useSubscribe(rep, allTodosInTx, []);
const listIds = useSubscribe(rep, allListsInTx, []);
const todos = todosInList(allTodos, selectedListId);
const createCallback = useCallback(() => {
if (!selectedListId) {
return;
}
const id = (Math.random() * 2 ** 31) | 0;
const order = newOrderBetween(
todos.length === 0 ? null : todos[todos.length - 1],
null,
);
setFocusedId(id);
mutations.createTodo({
id,
listId: selectedListId,
text: '',
complete: false,
order,
});
}, [todos, selectedListId, mutations]);
const syncCallback = useCallback(() => {
rep.sync();
}, [rep]);
if (
(selectedListId === null || !listIds.includes(selectedListId)) &&
listIds.length > 0
) {
setSelectedListId(listIds[0]);
}
return (
<div className="App">
<header className="App-header">Todo</header>
<header className="App-sub-header">
<button onClick={createCallback} disabled={!selectedListId}>
Create Todo
</button>
<button onClick={syncCallback}>Sync</button>
<button onClick={logout} title="Logout">
Logged in as {email}
</button>
</header>
<List
todos={todosInList(allTodos, selectedListId)}
mutations={mutations}
rep={rep}
focusedId={focusedId}
/>
</div>
);
}
export default App;
const prefix = '/todo/';
function registerMutations(rep: Replicache) {
const addPrefix = (id: number) => `${prefix}${id}`;
async function read(
tx: ReadTransaction,
id: number,
): Promise<Todo | undefined> {
const data = await tx.get(addPrefix(id));
return data as Todo | undefined;
}
function write(tx: WriteTransaction, todo: Todo): Promise<void> {
const key = addPrefix(todo.id);
return tx.put(key, todo);
}
function del(tx: WriteTransaction, id: number): Promise<boolean> {
return tx.del(addPrefix(id));
}
const createTodo = rep.register(
'createTodo',
async (tx: WriteTransaction, args: Todo) => {
await write(tx, args);
},
);
const deleteTodo = rep.register(
'deleteTodo',
async (tx: WriteTransaction, args: Todo) => {
const id = args['id'];
await del(tx, id);
},
);
const updateTodo = rep.register(
'updateTodo',
async (tx: WriteTransaction, args: Partial<Todo> & {id: number}) => {
const {id} = args;
const todo = await read(tx, id);
if (!todo) {
console.info(
'Warning: Possible conflict - Specified Todo $id is not present.' +
' Skipping reorder.',
);
return;
}
todo.text = args.text ?? todo.text;
todo.complete = args.complete ?? todo.complete;
todo.order = args.order ?? todo.order;
await write(tx, todo);
},
);
return {createTodo, deleteTodo, updateTodo};
}
async function allTodosInTx(tx: ReadTransaction): Promise<Todo[]> {
const todos: Todo[] = [];
for await (const value of tx.scan({prefix})) {
todos.push(value as Todo);
}
return todos;
}
function todosInList(allTodos: Todo[], listId: number | null): Todo[] {
const todos = allTodos.filter(todo => todo.listId === listId);
todos.sort((t1, t2) => t1.order - t2.order);
return todos;
}
async function allListsInTx(tx: ReadTransaction): Promise<number[]> {
const listIds: number[] = [];
for await (const value of tx.scan({prefix: '/list/'})) {
listIds.push((value as {id: number}).id);
}
return listIds;
}
export type Todo = {
id: number;
listId: number;
text: string;
complete: boolean;
order: number;
};