tegdb 0.5.0

The name TegridyDB (short for TegDB) is inspired by the Tegridy Farm in South Park and tries to correct some of the wrong database implementations, such as null support, implicit conversion support, etc.
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mod test_helpers {
    include!("../common/test_helpers.rs");
}
use test_helpers::run_with_both_backends;

use tegdb::{Database, SqlValue, StringFunctionsExtension};

#[test]
fn test_upper_function() {
    let _ = run_with_both_backends("test_upper_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic uppercase conversion
        let sql = "SELECT UPPER('hello')";
        let result = db.query(sql).unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("HELLO".to_string()));

        // Empty string
        let result = db.query("SELECT UPPER('')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // Already uppercase
        let result = db.query("SELECT UPPER('WORLD')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("WORLD".to_string()));

        // Mixed case
        let result = db.query("SELECT UPPER('Hello World')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("HELLO WORLD".to_string())
        );

        // Unicode
        let result = db.query("SELECT UPPER('café')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("CAFÉ".to_string()));

        // NULL handling
        let result = db.query("SELECT UPPER(NULL)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_lower_function() {
    let _ = run_with_both_backends("test_lower_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic lowercase conversion
        let result = db.query("SELECT LOWER('HELLO')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Empty string
        let result = db.query("SELECT LOWER('')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // Already lowercase
        let result = db.query("SELECT LOWER('world')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("world".to_string()));

        // Mixed case
        let result = db.query("SELECT LOWER('Hello World')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("hello world".to_string())
        );

        // Unicode
        let result = db.query("SELECT LOWER('CAFÉ')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("café".to_string()));

        // NULL handling
        let result = db.query("SELECT LOWER(NULL)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_length_function() {
    let _ = run_with_both_backends("test_length_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic length
        let result = db.query("SELECT LENGTH('hello')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Empty string
        let result = db.query("SELECT LENGTH('')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Integer(0));

        // Unicode characters (counted as single characters)
        let result = db.query("SELECT LENGTH('café')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Integer(4));

        // Multi-byte unicode
        let result = db.query("SELECT LENGTH('🚀')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Integer(1));

        // NULL handling
        let result = db.query("SELECT LENGTH(NULL)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_trim_functions() {
    let _ = run_with_both_backends("test_trim_functions", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // TRIM - both sides
        let result = db.query("SELECT TRIM('  hello  ')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // LTRIM - left side only
        let result = db.query("SELECT LTRIM('  hello  ')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello  ".to_string()));

        // RTRIM - right side only
        let result = db.query("SELECT RTRIM('  hello  ')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("  hello".to_string()));

        // Tabs
        let result = db.query("SELECT TRIM('\thello\t')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Newlines
        let result = db.query("SELECT TRIM('\nhello\n')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // No whitespace
        let result = db.query("SELECT TRIM('hello')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Only whitespace
        let result = db.query("SELECT TRIM('   ')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // NULL handling
        let result = db.query("SELECT TRIM(NULL)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_substr_function() {
    let _ = run_with_both_backends("test_substr_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic substring
        let result = db.query("SELECT SUBSTR('hello world', 1, 5)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Start from middle
        let result = db.query("SELECT SUBSTR('hello world', 7, 5)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("world".to_string()));

        // Length beyond string
        let result = db.query("SELECT SUBSTR('hello', 1, 100)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Start beyond string
        let result = db.query("SELECT SUBSTR('hello', 10, 5)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // Zero length
        let result = db.query("SELECT SUBSTR('hello', 1, 0)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // Unicode characters
        let result = db.query("SELECT SUBSTR('café', 1, 3)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("caf".to_string()));

        // NULL handling
        let result = db.query("SELECT SUBSTR(NULL, 1, 5)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_replace_function() {
    let _ = run_with_both_backends("test_replace_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic replacement
        let result = db.query("SELECT REPLACE('hello world', 'world', 'TegDB')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("hello TegDB".to_string())
        );

        // Multiple occurrences
        let result = db.query("SELECT REPLACE('hello hello', 'hello', 'hi')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hi hi".to_string()));

        // No match
        let result = db.query("SELECT REPLACE('hello', 'xyz', 'abc')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        // Empty replacement
        let result = db.query("SELECT REPLACE('hello world', 'world', '')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello ".to_string()));

        // Empty search string
        let result = db.query("SELECT REPLACE('hello', '', 'x')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("xhellox".to_string()));

        // NULL handling
        let result = db.query("SELECT REPLACE(NULL, 'a', 'b')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_concat_function() {
    let _ = run_with_both_backends("test_concat_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Two arguments
        let result = db.query("SELECT CONCAT('hello', ' world')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("hello world".to_string())
        );

        // Three arguments
        let result = db.query("SELECT CONCAT('hello', ' ', 'world')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("hello world".to_string())
        );

        // Multiple arguments
        let result = db.query("SELECT CONCAT('a', 'b', 'c', 'd')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("abcd".to_string()));

        // NULL handling - NULL is ignored
        let result = db.query("SELECT CONCAT('hello', NULL, 'world')").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("helloworld".to_string())
        );

        // Mixed types
        let result = db.query("SELECT CONCAT('Number: ', 42)").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("Number: 42".to_string())
        );

        // Real numbers
        let result = db.query("SELECT CONCAT('Value: ', 3.14)").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("Value: 3.14".to_string())
        );

        // Empty strings
        let result = db.query("SELECT CONCAT('', 'hello', '')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("hello".to_string()));

        Ok(())
    });
}

#[test]
fn test_reverse_function() {
    let _ = run_with_both_backends("test_reverse_function", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Basic reverse
        let result = db.query("SELECT REVERSE('hello')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("olleh".to_string()));

        // Empty string
        let result = db.query("SELECT REVERSE('')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("".to_string()));

        // Single character
        let result = db.query("SELECT REVERSE('a')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("a".to_string()));

        // Unicode characters
        let result = db.query("SELECT REVERSE('café')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("éfac".to_string()));

        // Multi-byte unicode
        let result = db.query("SELECT REVERSE('🚀🌍')").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("🌍🚀".to_string()));

        // NULL handling
        let result = db.query("SELECT REVERSE(NULL)").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Null);

        Ok(())
    });
}

#[test]
fn test_string_functions_in_table_queries() {
    let _ = run_with_both_backends("test_string_functions_in_table_queries", |db_path| {
        let mut db = Database::open(db_path).unwrap();
        db.register_extension(Box::new(StringFunctionsExtension)).unwrap();

        // Create table with text data
        db.execute("CREATE TABLE users (id INTEGER PRIMARY KEY, name TEXT(50), email TEXT(50))").unwrap();
        db.execute("INSERT INTO users (id, name, email) VALUES (1, 'Alice', 'ALICE@EXAMPLE.COM'), (2, 'Bob', 'bob@example.com')").unwrap();

        // Use functions in SELECT
        let result = db.query("SELECT UPPER(name), LOWER(email) FROM users WHERE id = 1").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Text("ALICE".to_string()));
        assert_eq!(
            result.rows()[0][1],
            SqlValue::Text("alice@example.com".to_string())
        );

        // Use functions in WHERE clause
        let result = db.query("SELECT name FROM users WHERE UPPER(name) = 'ALICE'").unwrap();
        assert_eq!(result.len(), 1);
        assert_eq!(result.rows()[0][0], SqlValue::Text("Alice".to_string()));

        // Use LENGTH in SELECT
        let result = db.query("SELECT LENGTH(name) FROM users WHERE id = 1").unwrap();
        assert_eq!(result.rows()[0][0], SqlValue::Integer(5));

        // Use CONCAT in SELECT
        let result = db.query("SELECT CONCAT(name, ' (', email, ')') FROM users WHERE id = 1").unwrap();
        assert_eq!(
            result.rows()[0][0],
            SqlValue::Text("Alice (ALICE@EXAMPLE.COM)".to_string())
        );

        Ok(())
    });
}