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Context.js
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Context.js
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import React, {useEffect, createContext} from 'react';
import PostData from './PostData.json';
import UserData from './userData.json';
const Context = createContext();
function reducer(state, action) {
switch (action.type) {
case "LOAD_DATA": {
return {
...state,
loading: false,
posts: PostData,
users: UserData
}
}
case "POST": {
return {
...state,
posts: [...state.posts, action.newPost]
}
}
case "ADD_COMMENT": {
const newComments = state.posts.map(post => {
if (post.id == action.id) {
return {
...post,
comments: [...post.comments, action.comment]
}
}
return post;
})
return {
...state,
posts: newComments
}
}
case "CURRENT_USER": {
const newUser = state.users.map(user => {
if (user.userId == state.currentUser) {
return {
...user,
userName: action.userName,
userProfilePhoto: action.userProfilePhoto
}
}
return user;
});
return {
...state,
users: newUser
}
}
case "LIKE": {
const newPosts = state.posts.map(post => {
if (post.id === action.id) {
return {
...post,
likes: [...post.likes, action.newLike],
};
}
return post;
});
return {
...state,
posts: newPosts,
};
}
case "UNLIKE": {
const newPosts = state.posts.map(post => {
if (post.id === action.id) {
return {
...post,
likes: post.likes.filter(like => like.userId !== state.currentUser),
};
}
return post;
});
return {
...state,
posts: newPosts,
};
}
}
return state
}
function ContextProvider(props) {
const [state, dispatch] = React.useReducer(reducer, {
loading: true,
posts: JSON.parse(localStorage.getItem('posts')) || [],
comments: [],
comment: '',
users: JSON.parse(localStorage.getItem('users')) || [],
currentUser: 1,
});
let {posts, users} = state;
useEffect(() => {
setTimeout(() => {
'';
dispatch({type: "LOAD_DATA"});
}, 1000);
}, []);
useEffect(() => {
localStorage.setItem('posts', JSON.stringify(posts));
}, [posts]);
useEffect(() => {
localStorage.setItem('users', JSON.stringify(users));
}, [users]);
return (
<Context.Provider value={{state, dispatch}}>
{props.children}
</Context.Provider>
)
}
export {ContextProvider, Context};