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use std::fs::File;
use std::io::Write;
use std::path::{PathBuf};
pub trait ToCSV {
fn get_header() -> String;
fn get_row(&self) -> String;
}
pub struct SimManger<DynamicParameters, EnvironmentParameters, StepFn>
where
StepFn: FnMut(&DynamicParameters, &mut EnvironmentParameters) -> DynamicParameters,
{
pub(crate) parameters: Vec<DynamicParameters>,
pub(crate) environment_parameters: EnvironmentParameters,
pub(crate) step_fn: StepFn,
pub(crate) output_file: Option<PathBuf>,
}
impl<DynamicParameters, EnvironmentParameters, StepFn>
SimManger<DynamicParameters, EnvironmentParameters, StepFn>
where
StepFn: FnMut(&DynamicParameters, &mut EnvironmentParameters) -> DynamicParameters,
{
pub fn new(
initial_conditions: DynamicParameters,
environment_parameters: EnvironmentParameters,
step_fn: StepFn,
) -> Self {
SimManger {
parameters: vec![initial_conditions],
environment_parameters,
step_fn,
output_file: None,
}
}
pub fn run<StopFn>(&mut self, stop_fn: StopFn) -> &mut Self
where
StopFn: Fn(&DynamicParameters, &EnvironmentParameters) -> bool,
{
loop {
let new_parameters = (self.step_fn)(
self.parameters.last().unwrap(),
&mut self.environment_parameters,
);
self.parameters.push(new_parameters);
if stop_fn(
self.parameters.last().unwrap(),
&self.environment_parameters,
) {
break;
}
}
self
}
}
impl<DynamicParameters, EnvironmentParameters, StepFn>
SimManger<DynamicParameters, EnvironmentParameters, StepFn>
where
DynamicParameters: ToCSV,
StepFn: FnMut(&DynamicParameters, &mut EnvironmentParameters) -> DynamicParameters,
{
pub fn to_file<'a>(&'a mut self, path: PathBuf) -> &'a mut Self {
self.output_file = Some(path);
self
}
pub fn run_with_save<StopFn>(&mut self, stop_fn: StopFn) -> &mut Self
where
StopFn: Fn(&DynamicParameters, &EnvironmentParameters) -> bool,
{
self.run(stop_fn);
self.output_to_file();
self
}
fn output_to_file(&self) {
let path = self.output_file.as_ref().expect("You need to provide output file path first");
let mut file = File::create(
path
)
.expect("Cannot create file");
file.write(format!("{}\n", DynamicParameters::get_header()).as_bytes()).unwrap();
self.parameters
.iter()
.for_each(|x| {
file.write(format!("{}\n", x.get_row()).as_bytes()).unwrap();
} );
}
}