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mod questions;
use std::error::Error;
use std::time::SystemTime;
use std::fs::File;
use std::io::Write;
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use clap::ArgMatches;
use rand::prelude::*;
use rand_pcg::Lcg128Xsl64;
use questions::QuestionBank;
pub struct Config
{
pub seed: u64,
pub num_variants: u32,
pub question_bank_filename: String
}
impl Config
{
pub fn new(arguments: ArgMatches) -> Result<Config, &'static str>
{
let mut num_variants: u32 = 30;
let question_bank_filename = String::from(arguments.value_of("question-bank").unwrap_or("question.xml"));
let mut seed: u64 = match SystemTime::now().duration_since(SystemTime::UNIX_EPOCH)
{
Ok(current_unix_time) => current_unix_time.as_secs(),
Err(system_time_error) => system_time_error.duration().as_secs()
};
if let Some(text_seed) = arguments.value_of("text-seed")
{
let mut hasher = DefaultHasher::new();
text_seed.hash(&mut hasher);
seed = hasher.finish();
}
if let Some(num_seed_str) = arguments.value_of("num-seed")
{
match num_seed_str.parse::<u64>()
{
Ok(num_seed) => seed = num_seed,
Err(_) => return Err("Invalid numeric seed! Use -S for non-numeric seeds.")
}
}
if let Some(variants) = arguments.value_of("variants")
{
num_variants = match variants.parse::<u32>()
{
Ok(num) => num,
Err(_) => return Err("Invalid number of variants!")
};
if num_variants == 0
{
return Err("Please provide a number of variants greater than 0.");
}
}
Ok(Config
{
seed,
num_variants,
question_bank_filename
})
}
}
pub fn run(config: Config) -> Result<(), Box<dyn Error>>
{
let mut rng = Lcg128Xsl64::seed_from_u64(config.seed);
let question_bank = QuestionBank::from_file(&config.question_bank_filename)?;
for i in 0..config.num_variants
{
let mut question_counter: u32 = 0;
let mut file = File::create(format!("variant_{}.txt", i + 1))?;
file.write_all(question_bank.random_variant(&mut rng, &mut question_counter).as_bytes())?;
}
Ok(())
}