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const { Record, List } = require('immutable');
const { createBrowserHistory, createMemoryHistory } = require('history');
const ACTION_TYPES = require('../actions/TYPES');
const isServerSide = (typeof window === 'undefined');
const NavigationState = Record({
// Are we loading a new page
loading: Boolean(false),
// Did we fail loading a page?
error: null,
// Listener for history changes
listeners: List(),
// Function to call to stop listening
unlisten: null,
// History instance
history: null
});
function reduceNavigation(state, action) {
state = state || NavigationState();
switch (action.type) {
case ACTION_TYPES.PAGE_FETCH_START:
return state.merge({
loading: true
});
case ACTION_TYPES.PAGE_FETCH_END:
return state.merge({
loading: false
});
case ACTION_TYPES.PAGE_FETCH_ERROR:
return state.merge({
loading: false,
error: action.error
});
case ACTION_TYPES.NAVIGATION_ACTIVATE:
const history = isServerSide ? createMemoryHistory() : createBrowserHistory();
const unlisten = history.listen(action.listener);
// We can't use .merge since it convert history to an immutable
const newState = state
.set('history', history)
.set('unlisten', unlisten);
return newState;
case ACTION_TYPES.NAVIGATION_DEACTIVATE:
if (state.unlisten) {
state.unlisten();
}
return state.merge({
history: null,
unlisten: null
});
case ACTION_TYPES.NAVIGATION_LISTEN:
return state.merge({
listeners: state.listeners.push(action.listener)
});
default:
return state;
}
}
module.exports = reduceNavigation;
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