struct Encoder {}

struct StructType[T] {
mut:
    val T
}

fn (e &Encoder) encode_struct[U](val U) ! {
    $for field in U.fields {
        $if field.typ is $struct {
            e.encode_struct(val.$(field.name))!
        } $else $if field.typ is $map {
            e.encode_map(val.$(field.name))!
        }
    }
}

fn (e &Encoder) encode_map[U](val U) ! {
    for k, v in val {
        e.encode_value_with_level(v)!
    }
}

fn (e &Encoder) encode_value_with_level[U](val U) ! {
    $if U is $struct {
        e.encode_struct(val)!
    } $else $if U is $map {
        e.encode_map(val)!
    }
}

fn test_simple_cases() {
    e := Encoder{}
    e.encode_struct(StructType[map[string]string]{
        val: {
            '1': '1'
        }
    })!
    e.encode_struct(StructType[map[string]map[string]int]{})!
    e.encode_struct(StructType[map[string]map[string]int]{
        val: {
            'a': {
                '1': 1
            }
        }
    })!

    assert true
}