use myc::ast::environment::Environment;
use myc::ast::types::Value;

#[test]
fn test_dynamic_call_destructuring_underflow() {
    let env = Environment::new();
    let source = "(do
        (def call-dynamic (fn [f data] (f data)))
        (def data [10 [20 30]])
        (def x (fn [[a [b c]]] (+ a (+ b c))))
        (call-dynamic x data))";

    let result = env.run_script(source);
    if let Err(e) = &result {
        panic!("Failed: {}", e);
    }
    assert_eq!(format!("{}", result.unwrap()), "60");
}

#[test]
fn test_nested_destructuring_optimization() {
    let env = Environment::new();

    let source_tuple = "((fn [[x y]] (+ x y)) [10 20])";
    assert_eq!(format!("{}", env.run_script(source_tuple).unwrap()), "30");
    let dump_tuple = env.dump_ast(source_tuple).unwrap();
    assert!(
        dump_tuple.contains("Constant: 30"),
        "Nested tuple should be folded to 30. Dump:\n{}",
        dump_tuple
    );
}

#[test]
fn test_def_destructuring() {
    let env = Environment::new();

    // 1. Global destructuring
    let source_global = "(do (def [a b] [1 2]) (+ a b))";
    assert_eq!(format!("{}", env.run_script(source_global).unwrap()), "3");

    // 2. Local nested destructuring inside a function
    let source_local =
        "((fn [x] (do (def [a [[b c] d]] x) (+ a (+ b (+ c d))))) [1 [[2 3] 4]])";
    assert_eq!(format!("{}", env.run_script(source_local).unwrap()), "10");

    // 3. Verify destructuring result manually
    let source_check = "(do (def [x y] [7 8]) [x y])";
    let res = env.run_script(source_check).unwrap();
    if let Value::Tuple(vals) = res {
        assert_eq!(vals.len(), 2);
        assert_eq!(format!("{}", vals[0]), "7");
        assert_eq!(format!("{}", vals[1]), "8");
    } else {
        panic!("Expected tuple from [x y], got {:?}", res);
    }
}

#[test]
fn test_assign_destructuring() {
    // 1. Simple assignment destructuring
    {
        let env = Environment::new();
        let source_simple = "(do (def a 0) (def b 0) (assign [a b] [10 20]) (+ a b))";
        assert_eq!(format!("{}", env.run_script(source_simple).unwrap()), "30");
    }

    // 2. Nested assignment destructuring
    {
        let env = Environment::new();
        let source_nested =
            "(do (def a 0) (def b 0) (def c 0) (assign [a [b c]] [1 [2 3]]) (+ a (+ b c)))";
        assert_eq!(format!("{}", env.run_script(source_nested).unwrap()), "6");
    }

    // 3. Assignment value check
    {
        let env = Environment::new();
        let source_return = "(do (def a 0) (def b 0) (assign [a b] [5 6]) [a b])";
        let res = env.run_script(source_return).unwrap();
        if let Value::Tuple(vals) = res {
            assert_eq!(vals.len(), 2);
            assert_eq!(format!("{}", vals[0]), "5");
            assert_eq!(format!("{}", vals[1]), "6");
        } else {
            panic!("Expected tuple from [a b], got {:?}", res);
        }
    }
}

#[test]
fn test_multi_level_destructuring() {
    let env = Environment::new();
    let source = "(do
      (def process_data (fn [conf]
        (do
           (def [str s] conf)
           (def [f ss] s)
           [\"Symbol:\" str \"field:\" f \"id:\" ss]
        )
       )
      )
      (process_data [\"btc\" [:close \"cls\"]]))";

    let res = env.run_script(source).unwrap();
    assert_eq!(
        format!("{}", res),
        "[\"Symbol:\" \"btc\" \"field:\" :close \"id:\" \"cls\"]"
    );
}

#[test]
fn test_captured_slot_destructuring() {
    let env = Environment::new();
    // A closure capturing both slots from a destructuring def must work correctly.
    let source = r#"
    (do
        (def [x y] [10 20])
        (def get-sum (fn [] (+ x y)))
        (get-sum))
    "#;
    assert_eq!(format!("{}", env.run_script(source).unwrap()), "30");
}

#[test]
fn test_destructuring_capture_mutation() {
    let env = Environment::new();
    // A closure mutating a slot bound via destructuring must see the updated value.
    let source = r#"
    (do
        (def [a b] [1 2])
        (def inc! (fn [] (assign a (+ a b))))
        (inc!)
        (inc!)
        a)
    "#;
    // 1+2=3, 3+2=5
    assert_eq!(format!("{}", env.run_script(source).unwrap()), "5");
}