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

#[test]
fn test_series_api_with_limit() {
    let env = Environment::new();
    // (series limit) — schema is inferred from push calls
    let source = "(series 100)";
    let result = env.compile(source).into_result();
    assert!(result.is_ok(), "Series creation with limit should work: {:?}", result.err());
}

/// Regression test for HM type inference through nested closures.
///
/// `series` is created in an outer closure, `push` happens in an inner closure.
/// The pushed value type must propagate back through the TypeVar chain so that
/// the compiler can inject the `:float` schema — no explicit schema given.
#[test]
fn test_series_infer_type_from_nested_closure() {
    let env = Environment::new();
    let source = r#"
    (do
      (def make-acc
        (fn [n]
          (do
            (def s (series n))
            (def total 0.0)
            (fn [x]
              (do
                (assign total (+ total x))
                (push s x)
                (s 0))))))
      (def acc (make-acc 5))
      (acc 1.5))
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 1.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(1.5), got {:?}", other),
    }
}

/// Regression test: TypeVar on a series used as an upvalue inside a `while` loop
/// (zero-parameter lambda created by the macro) must be resolved via the global
/// substitution even when `ctx.set_type` silently ignores the upvalue address.
#[test]
fn test_series_typevar_resolved_through_while_upvalue() {
    let env = Environment::new();
    let source = r#"
    (do
      (def ticks (series 10))
      (def i 0)
      (while (< i 3)
        (do
          (push ticks {:price (* i 1.0)})
          (assign i (+ i 1))))
      (def p (.price ticks))
      (p 0)
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 2.0).abs() < 1e-9 => {}
        other => panic!("Expected Float(2.0), got {:?}", other),
    }
}

// ── Numeric promotion (Int → Float widening) ────────────────────────────────

/// Push int first, then float: series element type should widen to Float.
/// The int value must be readable back as a float (no truncation).
#[test]
fn test_series_promote_int_then_float() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s 1)
      (push s 2.5)
      (+ (s 0) (s 1))
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 3.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(3.5), got {:?}", other),
    }
}

/// Push float first, then int: same widening, other direction.
#[test]
fn test_series_promote_float_then_int() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s 2.5)
      (push s 1)
      (+ (s 0) (s 1))
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 3.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(3.5), got {:?}", other),
    }
}

/// `if` branches with int/float: the join type must be Float, not Any.
/// A Float series is expected — the pushed value must be accessible as float.
#[test]
fn test_series_promote_if_int_float_branch() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s (if true 1 2.5))
      (push s (if false 1 2.5))
      (+ (s 0) (s 1))
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 3.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(3.5), got {:?}", other),
    }
}

/// Int variable pushed into a float-inferred series must be promoted.
#[test]
fn test_series_promote_int_variable_into_float_series() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (def n 3)
      (push s 1.5)
      (push s n)
      (+ (s 0) (s 1))
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 4.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(4.5), got {:?}", other),
    }
}

/// Record field promotion: pushing records where one field is int, another float.
/// The field type must widen to Float.
#[test]
fn test_series_promote_record_field_int_float() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s {:v 1})
      (push s {:v 2.5})
      (def v (.v s))
      (+ (v 0) (v 1))
    )
    "#;
    let result = env.run_script(source);
    match result {
        Ok(Value::Float(v)) if (v - 3.5).abs() < 1e-9 => {}
        other => panic!("Expected Float(3.5), got {:?}", other),
    }
}

/// Sanity check: Bool → Int is NOT a valid promotion (different semantic type).
#[test]
fn test_series_no_promotion_bool_int() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s true)
      (push s 1)
      (s 0)
    )
    "#;
    let result = env.compile(source).into_result();
    assert!(result.is_err(), "Bool->Int promotion must not be allowed");
}

/// Sanity check: Float → Bool is NOT a valid promotion.
#[test]
fn test_series_no_promotion_float_bool() {
    let env = Environment::new();
    let source = r#"
    (do
      (def s (series 5))
      (push s 1.5)
      (push s true)
      (s 0)
    )
    "#;
    let result = env.compile(source).into_result();
    assert!(result.is_err(), "Float->Bool promotion must not be allowed");
}

#[test]
fn test_record_structural_equality_order() {
    let env = Environment::new();
    // Known design choice: currently order dependent.
    let source = "(= {:a 1 :b 2} {:b 2 :a 1})";
    let result = env.run_script(source);
    match result {
        Ok(Value::Bool(false)) => {}, 
        _ => panic!("Expected false (current implementation behavior)"),
    }
}