import React, { useState } from 'react';

import { ScrollView, StyleSheet, Text, TouchableOpacity, Platform, Linking } from 'react-native';

import AutoHeightWebView from 'react-native-autoheight-webview';

import {
  autoHeightHtml0,
  autoHeightHtml1,
  autoHeightScript,
  autoWidthHtml0,
  autoWidthHtml1,
  autoWidthScript,
  autoDetectLinkScript,
  style0,
  inlineBodyStyle
} from './config';

const onShouldStartLoadWithRequest = result => {
  console.log(result);
  return true;
};

const onError = ({ nativeEvent }) => console.error('WebView error: ', nativeEvent);

const onMessage = event => {
  const { data } = event.nativeEvent;
  let messageData;
  // maybe parse stringified JSON
  try {
    messageData = JSON.parse(data);
  } catch (e) {
    console.log(e.message);
  }
  if (typeof messageData === 'object') {
    const { url } = messageData;
    // check if this message concerns us
    if (url && url.startsWith('http')) {
      Linking.openURL(url).catch(error => console.error('An error occurred', error));
    }
  }
};

const onHeightLoadStart = () => console.log('height on load start');

const onHeightLoad = () => console.log('height on load');

const onHeightLoadEnd = () => console.log('height on load end');

const onWidthLoadStart = () => console.log('width on load start');

const onWidthLoad = () => console.log('width on load');

const onWidthLoadEnd = () => console.log('width on load end');

const Explorer = () => {
  const [{ widthHtml, heightHtml }, setHtml] = useState(() => ({
    widthHtml: autoWidthHtml0,
    heightHtml: autoHeightHtml0
  }));
  const changeSource = () =>
    setHtml({
      widthHtml: widthHtml === autoWidthHtml0 ? autoWidthHtml1 : autoWidthHtml0,
      heightHtml: heightHtml === autoHeightHtml0 ? autoHeightHtml1 : autoHeightHtml0
    });

  const [{ widthStyle, heightStyle }, setStyle] = useState(() => ({
    heightStyle: null,
    widthStyle: inlineBodyStyle
  }));
  const changeStyle = () =>
    setStyle({
      widthStyle: widthStyle == inlineBodyStyle ? style0 + inlineBodyStyle : inlineBodyStyle,
      heightStyle: heightStyle == null ? style0 : null
    });

  const [{ widthScript, heightScript }, setScript] = useState(() => ({
    heightScript: autoDetectLinkScript,
    widthScript: null
  }));
  const changeScript = () =>
    setScript({
      widthScript: widthScript !== autoWidthScript ? autoWidthScript : null,
      heightScript:
        heightScript !== autoDetectLinkScript ? autoDetectLinkScript : autoHeightScript + autoDetectLinkScript
    });

  const [heightSize, setHeightSize] = useState(() => ({ height: 0, width: 0 }));
  const [widthSize, setWidthSize] = useState(() => ({ height: 0, width: 0 }));

  return (
    <ScrollView
      style={{
        paddingTop: 45,
        backgroundColor: 'lightyellow'
      }}
      contentContainerStyle={{
        justifyContent: 'center',
        alignItems: 'center'
      }}
    >
      <AutoHeightWebView
        customStyle={heightStyle}
        onError={onError}
        onLoad={onHeightLoad}
        onLoadStart={onHeightLoadStart}
        onLoadEnd={onHeightLoadEnd}
        onShouldStartLoadWithRequest={onShouldStartLoadWithRequest}
        onSizeUpdated={setHeightSize}
        source={{ html: heightHtml }}
        customScript={heightScript}
        onMessage={onMessage}
      />
      <Text style={{ padding: 5 }}>
        height: {heightSize.height}, width: {heightSize.width}
      </Text>
      <AutoHeightWebView
        baseUrl={Platform.OS === 'android' ? 'file:///android_asset/webAssets/' : 'webAssets/'}
        style={{
          marginTop: 15
        }}
        enableBaseUrl
        files={[
          {
            href: 'demo.css',
            type: 'text/css',
            rel: 'stylesheet'
          }
        ]}
        customStyle={widthStyle}
        onError={onError}
        onLoad={onWidthLoad}
        onLoadStart={onWidthLoadStart}
        onLoadEnd={onWidthLoadEnd}
        onShouldStartLoadWithRequest={onShouldStartLoadWithRequest}
        onSizeUpdated={setWidthSize}
        source={{ html: widthHtml }}
        customScript={widthScript}
      />
      <Text style={{ padding: 5 }}>
        height: {widthSize.height}, width: {widthSize.width}
      </Text>
      <TouchableOpacity onPress={changeSource} style={styles.button}>
        <Text>change source</Text>
      </TouchableOpacity>
      <TouchableOpacity onPress={changeStyle} style={styles.button}>
        <Text>change style</Text>
      </TouchableOpacity>
      <TouchableOpacity onPress={changeScript} style={[styles.button, { marginBottom: 100 }]}>
        <Text>change script</Text>
      </TouchableOpacity>
    </ScrollView>
  );
};

const styles = StyleSheet.create({
  button: {
    marginTop: 15,
    backgroundColor: 'aliceblue',
    borderRadius: 5,
    padding: 5
  }
});

export default Explorer;