tattletires/app/(tabs)/index.tsx

import { CameraView, useCameraPermissions } from 'expo-camera'
import { useRef, useState } from 'react'
import { Button, Image, StyleSheet, Text, TouchableOpacity, View } from 'react-native'

export default function App() {
    const [permission, requestPermission] = useCameraPermissions()
    const [photo, setPhoto] = useState('')
    const cameraRef = useRef<CameraView>(null)

    async function _takePhoto() {
        if (cameraRef.current) {
            const pic = await cameraRef.current.takePictureAsync()
            setPhoto(pic.base64 || '')
        }
    }

    async function sendData() {
        await fetch('http://localhost:3000/api/v1/posts', {
            method: 'POST',
            headers: {
                Accept: 'application/json, text/plain, */*',
                'Content-Type': 'application/json'
            },
            body: JSON.stringify({
                userID: '6883ddb2640ebaa1a12e3791',
                date: new Date(),
                photo: photo,
                notes: '3333 W Smoochie St'
            })
        })
    }

    if (!permission) {
        // Camera permissions are still loading.
        return <View />
    }

    if (!permission.granted) {
        // Camera permissions are not granted yet.
        return (
            <View style={styles.container}>
                <Text style={styles.message}>We need your permission to show the camera</Text>
                <Button onPress={requestPermission} title='grant permission' />
            </View>
        )
    }

    return (
        <View style={styles.container}>
            {photo ? (
                <View style={styles.cameraContainer}>
                    <Image source={{ uri: photo }} style={styles.camera} />
                    <View style={styles.buttonContainer}>
                        <TouchableOpacity style={styles.button} onPress={() => setPhoto('')}>
                            <Text style={styles.text}>Retake</Text>
                        </TouchableOpacity>
                        <TouchableOpacity style={styles.button} onPress={sendData}>
                            <Text style={styles.text}>Continue</Text>
                        </TouchableOpacity>
                    </View>
                </View>
            ) : (
                <>
                    <View style={styles.cameraContainer}>
                        <CameraView style={styles.camera} facing={'back'} ref={cameraRef}></CameraView>
                    </View>
                    <View style={styles.buttonContainer}>
                        <TouchableOpacity style={styles.button} onPress={_takePhoto}>
                            <Text style={styles.text}>Take Photo</Text>
                        </TouchableOpacity>
                    </View>
                </>
            )}
        </View>
    )
}

const styles = StyleSheet.create({
    container: {
        flex: 1,
        backgroundColor: '#25292e',
        justifyContent: 'center',
        paddingHorizontal: 25,
        paddingVertical: 200
    },
    cameraContainer: {
        flex: 1
    },
    message: {
        textAlign: 'center',
        paddingBottom: 10
    },
    camera: {
        flex: 1
    },
    buttonContainer: {
        flex: 0.2,
        flexDirection: 'row',
        backgroundColor: 'orange',
        marginTop: 15,
        borderRadius: 5
    },
    button: {
        flex: 1,
        alignSelf: 'center',
        alignItems: 'center'
    },
    text: {
        fontSize: 24,
        fontWeight: 'bold',
        color: 'white'
    }
})