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// There are three letter x, y, and z, which are each integers between 1 and 3 inclusive, where x + y = z
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use std::collections::HashMap;

            

        

            

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use std::sync::Mutex;

            

        

            

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use minion_sys::ast::{Constant, Constraint, Model, Var, VarDomain, VarName};

            

        

            

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use minion_sys::error::MinionError;

            

        

            

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use minion_sys::get_from_table;

            

        

            

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#[test]

            

        

            

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#[allow(clippy::panic_in_result_fn)]

            

        

            

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fn test_table_constraint() -> Result<(), MinionError> {

            

        

            

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    let mut model = Model::new();

            

        

            

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    // Declares variables (x, y, z), explicitly setting the integers to be between 1 and 3

            

        

            

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    model

            

        

            

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        .named_variables

            

        

            

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        .add_var(String::from("x"), VarDomain::Discrete(1, 3));

            

        

            

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    model

            

        

            

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        .named_variables

            

        

            

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        .add_var(String::from("y"), VarDomain::Discrete(1, 3));

            

        

            

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    model

            

        

            

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        .named_variables

            

        

            

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        .add_var(String::from("z"), VarDomain::Discrete(1, 3));

            

        

            

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    // Defines the table data (a list of tuples)

            

        

            

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    let table_data = vec![

            

        

            

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        vec![

            

        

            

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            Constant::Integer(1),

            

        

            

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            Constant::Integer(1),

            

        

            

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            Constant::Integer(2),

            

        

            

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        ],

            

        

            

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        vec![

            

        

            

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            Constant::Integer(1),

            

        

            

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            Constant::Integer(2),

            

        

            

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            Constant::Integer(3),

            

        

            

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        ],

            

        

            

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        vec![

            

        

            

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            Constant::Integer(2),

            

        

            

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            Constant::Integer(1),

            

        

            

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            Constant::Integer(3),

            

        

            

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        ],

            

        

            

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    ];

            

        

            

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    // Builds the Table constraint

            

        

            

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    let vars = vec![

            

        

            

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        Var::NameRef(String::from("x")),

            

        

            

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        Var::NameRef(String::from("y")),

            

        

            

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        Var::NameRef(String::from("z")),

            

        

            

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    ];

            

        

            

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    model.constraints.push(Constraint::Table(vars, table_data));

            

        

            

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    // Runs the solver via the Minion interface

            

        

            

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    minion_sys::run_minion(model, callback)?;

            

        

            

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    // Asserts that we found exactly 3 solutions (one for each row in the table)

            

        

            

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    let guard = SOLS_COUNTER.lock().unwrap();

            

        

            

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    assert_eq!(*guard, 3);

            

        

            

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    assert_ne!(get_from_table("Nodes".into()), None);

            

        

            

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    Ok(())

            

        

            

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}

            

        

            

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// Global thread safe counter to store the number of solutions found

            

        

            

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static SOLS_COUNTER: Mutex<u32> = Mutex::new(0);

            

        

            

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// Callback function increments the counter for every solution

            

        

            

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fn callback(_: HashMap<VarName, Constant>) -> bool {

            

        

            

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    #[allow(clippy::unwrap_used)]

            

        

            

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    let mut guard = SOLS_COUNTER.lock().unwrap();

            

        

            

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    *guard += 1;

            

        

            

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    true

            

        

            

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}