import { useState, useEffect } from 'react'
import { supabase } from '@/lib/supabase'
import { StyleSheet, Alert, Image, TouchableOpacity } from 'react-native'
import * as ImagePicker from 'expo-image-picker'
//import { ImageManipulator } from 'expo-image-manipulator';
import { ThemedView, ThemedText, ThemedTextButton } from '../theme';
import { IconSymbol } from '@/components/ui/IconSymbol';

interface Props {
  size: number
  url: string | null
  onUpload: (filePath: string) => void
}

export default function Avatar({ url, size = 150, onUpload }: Props) {
  const [uploading, setUploading] = useState(false)
  const [avatarUrl, setAvatarUrl] = useState<string | null>(null)
  const avatarSize = { height: size, width: size }

  useEffect(() => {
    if (url) downloadImage(url)
  }, [url])

  async function downloadImage(path: string) {
    try {
      const { data, error } = await supabase.storage.from('avatars').download(path)

      if (error) {
        throw error
      }

      const fr = new FileReader()
      fr.readAsDataURL(data)
      fr.onload = () => {
        setAvatarUrl(fr.result as string)
      }
    } catch (error) {
      if (error instanceof Error) {
        console.log('Error downloading image: ', error.message)
      }
    }
  };

  async function uploadAvatar() {
    try {
      setUploading(true)
      const { data: { user } } = await supabase.auth.getUser();

      const result = await ImagePicker.launchImageLibraryAsync({
        mediaTypes: ImagePicker.MediaTypeOptions.Images, // Restrict to only images
        allowsMultipleSelection: false, // Can only select one image
        allowsEditing: true, // Allows the user to crop / rotate their photo before uploading it
        quality: 1,
        exif: false, // We don't want nor need that data.
      });

      if (result.canceled || !result.assets || result.assets.length === 0) {
        console.log('User cancelled image picker.');
        return;
      }

      //const manipulatedImage = await ImageManipulator.manipulate(result.assets[0].uri)
        //.resize({ width: 300 })
        //.renderAsync();

      //const manipulateResult = await manipulateAsync(
        //result.assets[0].uri,
        //[{resize: {width: 300, height: 300}}],
        //{compress: 0.7, format: SaveFormat.JPEG}
      //);

      const image = result.assets[0];
      console.log('Got image', image)

      if (!image.uri) {
        throw new Error('No image uri!') // Realistically, this should never happen, but just in case...
      }

      const arraybuffer = await fetch(image.uri).then((res) => res.arrayBuffer())

      const fileExt = image.uri?.split('.').pop()?.toLowerCase() ?? 'jpeg'
      const path = `${Date.now()}.${fileExt}`
      const { data, error: uploadError } = await supabase.storage
        .from('avatars')
        .upload(path, arraybuffer, {
          contentType: image.mimeType ?? 'image/jpeg',
        });
      const { data: updateData, error: updateError } = await supabase
        .from('profiles')
        .update({ avatar_url: data?.path })
        .eq('id', user?.id);

      if (uploadError) {
        throw uploadError
      }

      onUpload(data.path)
    } catch (error) {
      if (error instanceof Error) {
        Alert.alert(error.message)
      } else {
        throw error
      }
    } finally {
      setUploading(false)
    }
  };

  return (
    <TouchableOpacity
      onPress={uploadAvatar}
      style={styles.avatarContainer}
    >
      {avatarUrl ? (
        <Image source={{ uri: avatarUrl }} style={styles.avatar} />
      ) : (
        <ThemedView style={styles.avatarPlaceholder}>
          <IconSymbol name="person.fill" size={50} color="#999" />
        </ThemedView>
      )}
      <ThemedText style={styles.changePhotoText}>Change Photo</ThemedText>
    </TouchableOpacity>
  );
}

const styles = StyleSheet.create({
  avatarContainer: {
    alignItems: 'center',
    marginTop: 20,
    marginBottom: 30,
  },
  avatar: {
    width: 120,
    height: 120,
    borderRadius: 60,
  },
  avatarPlaceholder: {
    width: 120,
    height: 120,
    borderRadius: 60,
    backgroundColor: '#E1E1E1',
    justifyContent: 'center',
    alignItems: 'center',
  },
  changePhotoText: {
    marginTop: 8,
    color: '#007AFF',
    fontSize: 16,
  },
});