openqvd 1.2.0

Clean-room reader/writer for Qlik QVD (.qvd) files.
Documentation 
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//! Writer + round-trip tests.

use openqvd::{Column, Dual, Qvd, Value, WriteTable};

fn s(v: &str) -> Option<Value> {
    Some(Value::Str(v.into()))
}

#[test]
fn round_trip_no_nulls() {
    let cols = vec![
        Column::new(
            "id",
            vec![
                Some(Value::Int(1)),
                Some(Value::Int(2)),
                Some(Value::Int(3)),
            ],
        ),
        Column::new("name", vec![s("alpha"), s("beta"), s("alpha")]),
    ];
    let t = WriteTable::new("demo", cols).unwrap();
    let bytes = t.to_bytes().unwrap();
    let q = Qvd::from_bytes(bytes).unwrap();
    assert_eq!(q.num_rows(), 3);
    assert_eq!(q.table_name(), "demo");
    let rows: Vec<_> = q.rows().collect();
    assert_eq!(rows[0][0], Some(Value::Int(1)));
    assert_eq!(rows[0][1], s("alpha"));
    assert_eq!(rows[1][1], s("beta"));
    assert_eq!(rows[2][1], s("alpha"));
    // "alpha" must dedupe to a single symbol.
    assert_eq!(q.symbols(1).unwrap().len(), 2);
}

#[test]
fn round_trip_with_nulls() {
    let cols = vec![Column::new("v", vec![s("X"), None, s("Y"), s("X"), None])];
    let t = WriteTable::new("t", cols).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    let rows: Vec<_> = q.rows().collect();
    assert_eq!(rows[0][0], s("X"));
    assert_eq!(rows[1][0], None);
    assert_eq!(rows[2][0], s("Y"));
    assert_eq!(rows[3][0], s("X"));
    assert_eq!(rows[4][0], None);
    assert_eq!(q.fields()[0].bias, -2);
}

#[test]
fn round_trip_all_types() {
    let cols = vec![
        Column::new("i", vec![Some(Value::Int(-42)), Some(Value::Int(7))]),
        Column::new(
            "f",
            vec![Some(Value::Float(1.25)), Some(Value::Float(-0.5))],
        ),
        Column::new("s", vec![s("hi"), s("bye")]),
        Column::new(
            "di",
            vec![
                Some(Value::DualInt(Dual {
                    number: 10,
                    text: "ten".into(),
                })),
                Some(Value::DualInt(Dual {
                    number: 20,
                    text: "twenty".into(),
                })),
            ],
        ),
        Column::new(
            "df",
            vec![
                Some(Value::DualFloat(Dual {
                    number: 3.14,
                    text: "pi".into(),
                })),
                Some(Value::DualFloat(Dual {
                    number: 2.72,
                    text: "e".into(),
                })),
            ],
        ),
    ];
    let t = WriteTable::new("big", cols).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    let rows: Vec<_> = q.rows().collect();
    assert_eq!(rows[0][0], Some(Value::Int(-42)));
    assert_eq!(rows[0][1], Some(Value::Float(1.25)));
    assert_eq!(rows[0][2], s("hi"));
    assert!(matches!(&rows[0][3], Some(Value::DualInt(d)) if d.number == 10 && d.text == "ten"));
    assert!(matches!(&rows[0][4], Some(Value::DualFloat(d)) if d.number == 3.14 && d.text == "pi"));
    assert_eq!(rows[1][2], s("bye"));
}

#[test]
fn empty_table_round_trips() {
    // No rows, but a declared column.
    let t = WriteTable::new("empty", vec![Column::new("x", vec![])]).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    assert_eq!(q.num_rows(), 0);
    assert_eq!(q.fields().len(), 1);
    assert_eq!(q.fields()[0].bit_width, 0);
}

#[test]
fn single_symbol_column_uses_zero_width() {
    // Three rows, one unique non-null value: should collapse to 0 bits.
    let t = WriteTable::new(
        "k",
        vec![Column::new("c", vec![s("same"), s("same"), s("same")])],
    )
    .unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    assert_eq!(q.fields()[0].bit_width, 0);
    assert_eq!(q.fields()[0].no_of_symbols, 1);
    let rows: Vec<_> = q.rows().collect();
    for r in rows {
        assert_eq!(r[0], s("same"));
    }
}

#[test]
fn wide_cardinality_column() {
    // 500 distinct strings -> bit width 9.
    let mut cells: Vec<_> = (0..500).map(|i| s(&format!("k{i}"))).collect();
    cells.extend((0..500).map(|i| s(&format!("k{i}"))));
    let t = WriteTable::new("w", vec![Column::new("c", cells.clone())]).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    assert_eq!(q.fields()[0].no_of_symbols, 500);
    assert_eq!(q.fields()[0].bit_width, 9);
    let got: Vec<_> = q.rows().collect();
    for (i, row) in got.iter().enumerate() {
        assert_eq!(row[0], cells[i]);
    }
}

#[test]
fn nul_in_string_is_rejected() {
    let t = WriteTable::new(
        "bad",
        vec![Column::new("x", vec![Some(Value::Str("a\x00b".into()))])],
    )
    .unwrap();
    let err = t.to_bytes().unwrap_err();
    assert!(matches!(err, openqvd::QvdError::Structure(_)));
}

#[test]
fn uneven_columns_rejected() {
    let err = WriteTable::new(
        "uneven",
        vec![
            Column::new("a", vec![s("x")]),
            Column::new("b", vec![s("x"), s("y")]),
        ],
    )
    .unwrap_err();
    assert!(matches!(err, openqvd::QvdError::Structure(_)));
}

#[test]
fn writer_is_deterministic() {
    let cols = vec![
        Column::new(
            "i",
            vec![
                Some(Value::Int(3)),
                Some(Value::Int(1)),
                None,
                Some(Value::Int(2)),
            ],
        ),
        Column::new("s", vec![s("a"), s("b"), s("a"), None]),
    ];
    let t = WriteTable::new("det", cols).unwrap();
    let a = t.to_bytes().unwrap();
    let b = t.to_bytes().unwrap();
    assert_eq!(a, b);
}

#[test]
fn number_format_and_tags_round_trip() {
    use openqvd::NumberFormat;

    let mut col = Column::new(
        "price",
        vec![Some(Value::Float(1.25)), Some(Value::Float(2.5))],
    );
    col.number_format = NumberFormat {
        r#type: "MONEY".to_string(),
        n_dec: "2".to_string(),
        use_thou: "1".to_string(),
        fmt: "$#,##0.00;($#,##0.00)".to_string(),
        dec: ".".to_string(),
        thou: ",".to_string(),
    };
    col.tags = vec!["$numeric".to_string(), "$key".to_string()];

    let t = WriteTable::new("t", vec![col]).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();

    let f = &q.fields()[0];
    assert_eq!(f.number_format.r#type, "MONEY");
    assert_eq!(f.number_format.n_dec, "2");
    assert_eq!(f.number_format.use_thou, "1");
    assert_eq!(f.number_format.fmt, "$#,##0.00;($#,##0.00)");
    assert_eq!(f.number_format.dec, ".");
    assert_eq!(f.number_format.thou, ",");
    assert_eq!(f.tags, vec!["$numeric".to_string(), "$key".to_string()]);
}

#[test]
fn multiple_tags_all_preserved() {
    let mut col = Column::new("x", vec![Some(Value::Int(1))]);
    col.tags = vec![
        "$numeric".into(),
        "$integer".into(),
        "$key".into(),
        "$hidden".into(),
    ];
    let t = WriteTable::new("t", vec![col]).unwrap();
    let q = Qvd::from_bytes(t.to_bytes().unwrap()).unwrap();
    assert_eq!(q.fields()[0].tags.len(), 4);
    assert_eq!(q.fields()[0].tags[0], "$numeric");
    assert_eq!(q.fields()[0].tags[3], "$hidden");
}