#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sqlite3.h>

// Callback function taken from https://sqlite.org/quickstart.html
static int print_callback(void *NotUsed, int argc, char **argv, char **azColName){
    for(size_t i=0; i<argc; i++){
        printf("%s = %s\n", azColName[i], argv[i] ? argv[i] : "NULL");
    }
    printf("\n");
    return 0;
}

char* get_website_from_url(const char *url) {
    char *tmp = strstr(url, "rule34.xxx");
    if (tmp != NULL) {
        return "Rule34";
    }
    
    return NULL;
}

char* get_artist_from_url(const char *url, const char *website_name) {
    size_t offset = 0;
    if (strcmp(website_name, "Rule34") == 0) {
        offset = 51;
    } else if (strcmp(website_name, "Iwara") == 0) {
        //
    }
    
    if (offset == 0) {
        return NULL;
    }
    
    size_t i;
    for (i = 0; url[offset+i] != '\0'; i++) {}
    char *artist_name = malloc(i+1); // since this is programs halts soon, I dont need to free this manually
    memcpy(artist_name, url + offset, i);
    artist_name[i] = '\0';
    
    return artist_name;
}

bool add(sqlite3 *db, const char *url) {
    char *sql;
    int result;
    char *error_msg;

    const char *website_name = get_website_from_url(url);
    if (website_name == NULL) {
        fprintf(stderr, "Couldn't get website_name from url %s\n", url);
        return false;
    }
    const char *artist_name = get_artist_from_url(url, website_name);
    if (artist_name == NULL) {
        fprintf(stderr, "Couldn't get artist_name from url %s\n", url);
        return false;
    }

    sprintf(sql, "INSERT INTO hentai VALUES ('%s', '%s', '%s');", url, artist_name, website_name);
    result = sqlite3_exec(db, sql, print_callback, 0, &error_msg);
    if (result != SQLITE_OK) {
        fprintf(stderr, "SQL error: %s\n", error_msg);
        sqlite3_free(error_msg);
        return false;
    }
    return true;
}

int main(int argc, char **argv) {
    sqlite3 *db;
    int result;
    char *error_msg;
    char *sql;
    bool successful;

    result = sqlite3_open(":memory:", &db);
    if (result != SQLITE_OK || db == NULL) {
        fprintf(stderr, "Couldn't create or open db: %s\n", sqlite3_errmsg(db));
        sqlite3_close(db);
        return 1;
    }

    sql = "CREATE TABLE IF NOT EXISTS hentai (url TEXT PRIMARY KEY NOT NULL, artist_name TEXT NOT NULL, website_name TEXT NOT NULL) STRICT;";
    result = sqlite3_exec(db, sql, print_callback, 0, &error_msg);
    if (result != SQLITE_OK) {
        fprintf(stderr, "SQL error: %s\n", error_msg);
        sqlite3_free(error_msg);
    }

    printf("argc = %d\n", argc);
    printf("argv = {\n");
    for (int i = 0; i < argc; i++) {
        printf("\t%s\n", argv[i]);
    }
    printf("}\n");

    if (argc < 2) {
        fprintf(stderr, "Incorrect amount of arguments\n");
        // TODO: print_usage();
        sqlite3_close(db);
        return 1;
    }

    if (strcmp(argv[1], "add") == 0) {
        successful = add(db, argv[2]);
        if (!successful) {
            sqlite3_close(db);
            return 1;
        }
    } else {
        fprintf(stderr, "Invalid argument\n");
        sqlite3_close(db);
        return 1;
    }

    sql = "SELECT * FROM hentai;";
    result = sqlite3_exec(db, sql, print_callback, 0, &error_msg);
    if (result != SQLITE_OK) {
        fprintf(stderr, "SQL error: %s\n", error_msg);
        sqlite3_free(error_msg);
    }

    sqlite3_close(db);
    return 0;
}