// The store:
import createStore from 'unistore'

// Preact integration
import { Provider, connect } from 'unistore/preact'

// React integration
import { Provider, connect } from 'unistore/react'

import { createStore, Provider, connect } from 'unistore/full/preact'

import createStore from 'unistore'
import { Provider, connect } from 'unistore/preact'

let store = createStore({ count: 0, stuff: [] })

let actions = {
  // Actions can just return a state update:
  increment(state) {
    // The returned object will be merged into the current state
    return { count: state.count+1 }
  },

  // The above example as an Arrow Function:
  increment2: ({ count }) => ({ count: count+1 }),

  // Actions receive current state as first parameter and any other params next
  // See the "Increment by 10"-button below
  incrementBy: ({ count }, incrementAmount) => {
    return { count: count+incrementAmount }
  },
}

// If actions is a function, it gets passed the store:
let actionFunctions = store => ({
  // Async actions can be pure async/promise functions:
  async getStuff(state) {
    const res = await fetch('/foo.json')
    return { stuff: await res.json() }
  },

  // ... or just actions that call store.setState() later:
  clearOutStuff(state) {
    setTimeout(() => {
      store.setState({ stuff: [] }) // clear 'stuff' after 1 second
    }, 1000)
  }

  // Remember that the state passed to the action function could be stale after
  // doing async work, so use getState() instead:
  async incrementAfterStuff(state) {
    const res = await fetch('foo.json')
    const resJson = await res.json()
    // the variable 'state' above could now be old,
    // better get a new one from the store
    const upToDateState = store.getState()

    return {
      stuff: resJson,
      count: upToDateState.count + resJson.length,
    }
  }
})

// Connecting a react/preact component to get current state and to bind actions
const App1 = connect('count', actions)(
  ({ count, increment, incrementBy }) => (
    <div>
      <p>Count: {count}</p>
      <button onClick={increment}>Increment</button>
      <button onClick={() => incrementBy(10)}>Increment by 10</button>
    </div>
  )
)

// First argument to connect can also be a string, array or function while
// second argument can be an object or a function. Here we pass an array and
// a function.
const App2 = connect(['count', 'stuff'], actionFunctions)(
  ({ count, stuff, getStuff, clearOutStuff, incrementAfterStuff }) => (
    <div>
      <p>Count: {count}</p>
      <p>Stuff:
        <ul>{stuff.map(s => (
         <li>{s.name}</li>
        ))}</ul>
      </p>
      <button onClick={getStuff}>Get some stuff!</button>
      <button onClick={clearOutStuff}>Remove all stuff!</button>
      <button onClick={incrementAfterStuff}>Get and count stuff!</button>
    </div>
  )
)

export const getApp1 = () => (
  <Provider store={store}>
    <App1 />
  </Provider>
)

export const getApp2 = () => (
  <Provider store={store}>
    <App2 />
  </Provider>
)

import createStore from 'unistore'
import devtools    from 'unistore/devtools'

let initialState = { count: 0 };
let store = process.env.NODE_ENV === 'production' ?  createStore(initialState) : devtools(createStore(initialState));

// ...

let store = createStore();
store.subscribe( state => console.log(state) );
store.setState({ a: 'b' });   // logs { a: 'b' }
store.setState({ c: 'd' });   // logs { a: 'b', c: 'd' }

const Foo = connect('foo,bar')( ({ foo, bar }) => <div /> )

const actions = { someAction }
const Foo = connect('foo,bar', actions)( ({ foo, bar, someAction }) => <div /> )