#include <stdio.h>
#include <stdlib.h>
#include <libexif/exif-data.h>

// Prints EXIF entry
// Requires: pointer to ExifEntry
// pointer to user_data
void printExifEntry(ExifEntry *entry, void *user_data) {
    char value[1024];

    // If entry does not exist just quit
    if (!entry) return;

    // Get the value as a string
    exif_entry_get_value(entry, value, sizeof(value));
    if (*value) {
        printf("%s: %s\n", exif_tag_get_name(entry->tag), value);
    }
}

// showExif
// Gets passed content from exif_data_foreach_content
// calls printExif 
void showExif(ExifContent *content, void *user_data) {
    if (!content) return;

    // Iterate over all entries in the content and print them
    exif_content_foreach_entry(content, printExifEntry, user_data);
}

int main(int argc, char *argv[]) {
    ExifData *exifData;
    const char *file;

    if (argc != 2) {
        fprintf(stderr, "Usage: %s <file-path>\n", argv[0]);
        return 1;
    }

    file = argv[1];
    exifData = exif_data_new_from_file(file);
    if (!exifData) {
        fprintf(stderr, "Error: Unable to open file %s\n", file);
        return 1;
    }

    // Iterate over all EXIF contents and print entries
    exif_data_foreach_content(exifData, showExif, NULL);

    // Free the EXIF data
    exif_data_unref(exifData);

    return 0;
}