// @flow
import React from "react";
import map from "lodash/map";
import mapValues from "lodash/mapValues";
import filter from "lodash/filter";
import keys from "lodash/keys";
import merge from "lodash/merge";

import type { Config, Control, Topics } from "config/flowtypes";

import MuiThemeProvider from "@material-ui/core/styles/MuiThemeProvider";
import createMuiTheme from "@material-ui/core/styles/createMuiTheme";
import withStyles from "@material-ui/core/styles/withStyles";
import * as Colors from "@material-ui/core/colors";

import SideBar from "components/SideBar";
import ControlMap from "components/ControlMap";
import TopBar from "components/TopBar";
import UiItemList from "components/UiItemList";

import keyOf from "utils/keyOf";
import { controlGetIcon } from "utils/parseIconName";

import connectMqtt from "../connectMqtt";

export type AppProps = {
  config: Config
};

export type AppState = {
  selectedControl: ?Control,
  drawerOpened: boolean,
  mqttState: State,
  mqttSend: (topic: string, value: Actual) => void,
  mqttConnected: boolean,
};

class App extends React.PureComponent<AppProps & Classes, AppState> {
  constructor(props: AppProps & Classes) {
    super(props);
    this.state = {
      selectedControl: null,
      drawerOpened: false,
      mqttState: mapValues(this.topics, (topic) => ({
        actual: topic.defaultValue,
        internal: keyOf(topic.values, topic.defaultValue)
      })),
      mqttSend: connectMqtt(props.config.space.mqtt, {
        onMessage: this.receiveMessage.bind(this),
        onConnect: () => this.setState({ mqttConnected: true }),
        onReconnect: () => this.setState({ mqttConnected: false }),
        onDisconnect: () => this.setState({ mqttConnected: false }),
        subscribe: map(this.topics, (x) => x.state)
      }),
      mqttConnected: false
    };
  }

  get topics(): Topics {
    return Array.isArray(this.props.config.topics) ?
      Object.assign({}, ...this.props.config.topics) : this.props.config.topics;
  }

  static styles(_theme: Object) {
    return {
      drawerPaper: {
        width: 320
      }
    };
  }

  get theme() {
    return createMuiTheme({
      palette: {
        primary: Colors[this.props.config.space.color]
      }
    });
  }

  receiveMessage(rawTopic: string, message: Object) {
    const topics = filter(
      keys(this.topics),
      (k) => this.topics[k].state === rawTopic
    );
    if (topics.length === 0) {
      return;
    }
    for (let i in topics) {
      const topic = topics[i];
      const parseValue = this.topics[topic].type;
      const val = parseValue == null ? message.toString() : parseValue(message);
      this.setState({mqttState: Object.assign({}, merge(this.state.mqttState,
        { [topic]: {
          actual: val,
          internal: keyOf(this.topics[topic].values, val) || val
        }}))});
    }
  }

  changeControl(control: ?Control = null) {
    this.setState({selectedControl: control, drawerOpened: control != null});
  }

  closeDrawer() {
    this.setState({drawerOpened: false});
  }

  changeState(topic: string, value: Actual) {
    const rawTopic = this.topics[topic].command;
    if (rawTopic == null) {
      return;
    }
    this.state.mqttSend(
      rawTopic,
      String(this.topics[topic].values[value] || value)
    );
  }

  render() {
    return (
      <div>
        <MuiThemeProvider theme={this.theme}>
          <div>
            <TopBar title={`${this.props.config.space.name} Map`}
              connected={this.state.mqttConnected} />
            <SideBar open={this.state.drawerOpened}
              control={this.state.selectedControl}
              onCloseRequest={this.closeDrawer.bind(this)}
              icon={this.state.selectedControl == null ? null :
                controlGetIcon(this.state.selectedControl,
                  this.state.mqttState)}
            >
              {this.state.selectedControl == null
                || <UiItemList state={this.state.mqttState}
                  controls={this.state.selectedControl.ui}
                  onChangeState={this.changeState.bind(this)}
                />}
            </SideBar>
          </div>
        </MuiThemeProvider>
        <ControlMap width={1000} height={700} zoom={0}
          layers={this.props.config.layers}
          controls={this.props.config.controls}
          onChangeControl={this.changeControl.bind(this)}
          state={this.state.mqttState}
        />
      </div>
    );
  }
}

export default withStyles(App.styles)(App);