import { Alert, Appearance, Dimensions, Image, StyleSheet, Text, View } from 'react-native';
import { Colors } from 'react-native/Libraries/NewAppScreen';
import { PropsWithChildren, useEffect, useState } from 'react';
import { Button, Card, Modal } from '@ant-design/react-native';
import { V1Field } from '@formstr/sdk/dist/interfaces';
import { InputFiller } from '../Inputs/Inputs';
// import { SendPrescription } from './sendPrescription';
import { Dropdown } from 'react-native-element-dropdown';
import { SimplePool, UnsignedEvent, finalizeEvent, generateSecretKey, getPublicKey, nip04, nip19 } from 'nostr-tools';
import EncryptedStorage from 'react-native-encrypted-storage';
import { ImportNsec } from './ImportNsec';
import { json2xml } from 'xml-js';

function OBJtoXML(obj: any) {
  var xml = '';
  for (var prop in obj) {
      xml += "<" + prop + ">";
      if(Array.isArray(obj[prop])) {
          for (var array of obj[prop]) {

              // A real botch fix here
              xml += "</" + prop + ">";
              xml += "<" + prop + ">";

              xml += OBJtoXML(new Object(array));
          }
      } else if (typeof obj[prop] == "object") {
          xml += OBJtoXML(new Object(obj[prop]));
      } else {
          xml += obj[prop];
      }
      xml += "</" + prop + ">";
  }
  var xml = xml.replace(/<\/?[0-9]{1,}>/g,'');
  return xml
}

type SectionProps = PropsWithChildren<{
  title: string;
}>;

const colorScheme = Appearance.getColorScheme();

const backgroundStyle = {
  backgroundColor: Colors.darker,
};

const styles = StyleSheet.create({
  sectionContainer: {
    marginTop: 32,
    paddingHorizontal: 24,
    width: Dimensions.get('window').width - 80,
  },
  sectionTitle: {
    fontSize: 24,
    fontWeight: '600',
  },
  sectionDescription: {
    marginTop: 8,
    fontSize: 18,
    fontWeight: '400',
  },
  highlight: {
    fontWeight: '500',
  },
});


const width = Dimensions.get('window').width; //full width
const height = Dimensions.get('window').height

function Section({ children, title }: SectionProps): React.JSX.Element {
  return (
    <View style={styles.sectionContainer}>
      <Text
        style={[
          styles.sectionTitle,
          {
            color: Colors.white,
          },
        ]}>
        {title}
      </Text>
      <Text
        style={[
          styles.sectionDescription,
          {
            color: Colors.light,
          },
        ]}>
        {children}
      </Text>
    </View>
  );
}
const locationData = [
  { label: 'Pharmacy A', value: 'A', npub: 'npub1tea09rtjeuzgk4gjajzry37wuyv7h02d4zw38cpadcrkg5yt0qhqncr7km', relays: ["wss://relay.damus.io"] },
  { label: 'Pharmacy B', value: 'B', npub: 'npub1tea09rtjeuzgk4gjajzry37wuyv7h02d4zw38cpadcrkg5yt0qhqncr7km', relays: ["wss://relay.primal.net"] },
  { label: 'Pharmacy C', value: 'C', npub: 'npub1tea09rtjeuzgk4gjajzry37wuyv7h02d4zw38cpadcrkg5yt0qhqncr7km', relays: ["wss://relay.hllo.live"] },
  { label: 'Pharmacy D', value: 'D', npub: 'npub1tea09rtjeuzgk4gjajzry37wuyv7h02d4zw38cpadcrkg5yt0qhqncr7km', relays: ["wss://nos.lol", "wss://relay.damus.io"] }
]

const locationDummyData = [
  { label: 'Pharmacy A', value: 'A' }
]

export const PrescriptionCreator = ({ form }: { form: any }) => {
  if (form === null) return <View style={{ backgroundColor: "#ffffff" }}><Text style={{ color: "#000000" }}>Loading...</Text></View>
  const [showImportNsec, setShowImportNsec] = useState(false);
  const [loggedInNpub, setLoggedInNpub] = useState("")
  const [selectedPharmacyId, setSelectedPharmacyId] = useState("");
  const [selectedPharmacyRelays, setSelectedPharmacyRelays] = useState([]);
  const [finalJSON, setFinalJson] = useState({})

  useEffect(() => {
    async function initialize() {
      let doctorCredentials = null;
      try {
        doctorCredentials = await EncryptedStorage.getItem("user_credentials");
        if(!doctorCredentials) {
          setShowImportNsec(true)
        }
        else {
          setLoggedInNpub(nip19.npubEncode(getPublicKey(nip19.decode(doctorCredentials).data as Uint8Array)))
        }
      }
      catch(e) {
        console.log("Error getting credentials", e)
      }
    }
    initialize()
  }, [])
  const renderItem = (item: any) => {
    return <View style={{ width: width, display: 'flex', flexDirection: 'column', padding: 10, flexWrap: "wrap" }}>
      <Text style={{ color: "black", fontSize: 24 }}>{item.label}</Text>
      <View style={{ width: width - 100 }}>
        <Text style={{ color: 'grey', paddingBottom: 5 }}>Npub: {item.npub}</Text>
        <Text style={{ color: 'grey' }}>Relays: {item.relays.join(', ')}</Text>
      </View>
    </View>
  }

  const handleFormItemChange = (questionId: string, value: string) => {
    console.log("Filling", questionId, value)
    setFinalJson({...finalJSON, [questionId]: value})
  }

  const handleLocationChange = (item: any) => {
    setSelectedPharmacyId(item.npub)
    setSelectedPharmacyRelays(item.relays)
  }

  const handleImportNsec = (nsec: string) => {
    EncryptedStorage.setItem("user_credentials", nsec)
    if(nsec.startsWith('nsec1') && nsec.length !== 63) {
      Alert.alert("not a valid nsec!")
      return;
    }
    setLoggedInNpub(nip19.npubEncode(getPublicKey(nip19.decode(nsec).data as Uint8Array)))
    setShowImportNsec(false)
  }

  const handleButtonPress = () => {
    console.log("Final JSON is", finalJSON)
    const xml = OBJtoXML({form: finalJSON })
    console.log("XML is...", xml, typeof xml )
    sendPrescription(xml);
  }

  const sendPrescription = async (xml: string) => {
    console.log("Will generate IDs")
    const sk = nip19.decode(await EncryptedStorage.getItem("user_credentials") as `nsec1${string}`).data as Uint8Array
    const pk = getPublicKey(sk)
    const pharmacyId = nip19.decode(selectedPharmacyId).data as string
    console.log("Got ids")
    const baseKind4Event: UnsignedEvent = {
      kind: 4,
      tags: [["p", pharmacyId]],
      content: await nip04.encrypt(sk, pharmacyId, `This is a test prescription from PeerScribe ${xml}`),
      created_at: Math.floor(Date.now() / 1000),
      pubkey: pk
    }
    const finalEvent = finalizeEvent(baseKind4Event, sk)
    const pool = new SimplePool()
    console.log("publishing event")
    await Promise.any(pool.publish(selectedPharmacyRelays, finalEvent))
    console.log("Event Published")
    Alert.alert("Prescription Sent to the pharmacy!")
  }

  return (
    <View
      style={{
        backgroundColor: Colors.black,
      }}>
      <Image
        style={{
          height: 100,
          width: Dimensions.get('window').width,
        }}
        source={{
          uri: form.settings.titleImageUrl,
        }}
      />
      <Section title="PeerScribe">
        From the practice of {loggedInNpub}
        <Button size="small" onPress={() => {setShowImportNsec(true)}} >Edit!</Button>
      </Section>

      <Section title="Choose a Pharmacy">
        <View style={{ width: width - 40 }}>
          <Dropdown data={locationData} labelField={'label'} valueField={'label'} onChange={handleLocationChange} value={locationData[0]}
            renderItem={renderItem} style={{ width: "100%" }} placeholderStyle={{ color: "white" }} selectedTextStyle={{ color: 'white' }} />
        </View>
      </Section>

      <Section title="Prescription">
        <View style={{ display: 'flex', flexDirection: 'column', width: "100%" }}>
          {form.fields.map((field: V1Field) => {
            return (
              <Card
                key={field.questionId}
                style={{
                  display: 'flex',
                  flexDirection: 'column',
                  padding: 10,
                  backgroundColor: Colors.white,
                  margin: 10,
                  width: 350,
                  height: 'auto',
                }}>
                <Text
                  style={{
                    color: "#000000",
                  }}>
                  {field.question}
                </Text>
                {/* <Text
                  style={{
                    color: Colors.light,
                  }}>
                  {field.answerType}
                </Text> */}
                <InputFiller answerSettings={field.answerSettings} answerType={field.answerType} onChange={
                  (answer) => handleFormItemChange(field.questionId, answer)} />
              </Card>
            );
          })}
          <Button type='primary' onPress={handleButtonPress}> Create RX </Button>
        </View>
      </Section>
      <ImportNsec isVisible={showImportNsec} onClose={() => { setShowImportNsec(false)}} onPress={handleImportNsec}/>

    </View>
  );
};