//! The weekly menu planner
//!
extern crate planner;
extern crate cookbook;

use std::time;
use std::fmt::Debug;
use std::hash::Hash;
use cookbook::*;
use planner::{
    *, Value,
    solver::{
        Solution,
        Domain,
        Problem
    }
};


fn pretty_output<K: Eq + Hash + Debug>(res: &Solution<Value, K>) -> String {
    let mut repr = String::new();
    for (var,value) in res {
        let value = match value {
            Some(rec) => &rec.title,
            None => "---",
        };
        repr.push_str(&format!("{:?} => {}\n", var, value));
    }
    repr
}

fn main() {
    let start_time = time::Instant::now();
    let conn = establish_connection();
    let possible_values = recipes::load_all(&conn);
    let domain = Domain::new(possible_values);
    let mut problem = Problem::build();
    for (var, dom, ini) in template::Template::generate_variables(&domain) {
        problem = problem.add_variable(var, dom, ini);
    }
    let mut problem = problem.finish();
    let results = problem.solve_all();
    println!("Took {:?}", start_time.elapsed());
    println!("{}", pretty_output(results.first().unwrap()));
}