use crate::tasks::{CompletedTask, Task, TaskOutput};

pub struct Executor<'a, 't, N: Copy + PartialEq, T = ()> {
    task: &'t Task<N, T>,
    args: Box<[&'a str]>,
    ctx: T,
    complete_task: Option<CompletedTask<N>>,
}

impl<'a, 't, N: Copy + PartialEq, T> Executor<'a, 't, N, T> {
    pub fn new(task: &'t Task<N, T>, args: impl IntoIterator<Item = &'a str>, ctx: T) -> Self {
        Self { task: task, args: args.into_iter().collect(), ctx, complete_task: None }
    }

    pub fn run(&mut self) -> &TaskOutput {
        let output = (self.task.exec)(&self.args, &self.ctx);
        self.complete_task = Some(CompletedTask { name: self.task.name, output: Some(output) });
        self.complete_task.as_ref().unwrap().output.as_ref().unwrap()
    }
}