//! Database Driver for MSSQL
//!
//! Note:
//! **This driver will probably never be fully implemented**
//!
//! Contains database-specific query data
use super::*;

/// The struct implementing the `DatabaseDriver` trait
#[derive(Debug)]
pub struct MSSQL;

impl MSSQL {
    /// Create a MSSQL Driver
    pub fn new() -> Self {
        MSSQL {}
    }
}

impl DatabaseDriver for MSSQL {
    /// Get which characters are used to delimit identifiers
    /// such as tables, and columns
    fn _quotes(&self) -> (char, char) {
        ('[', ']')
    }

    fn explain(&self, sql: &str) -> String {
        sql.to_string()
    }

    fn random(&self) -> String {
        String::from(" RANDOM")
    }
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_quote_identifier_bracket_quote() {
        let driver = MSSQL::new();

        assert_eq!(
            driver.quote_identifier("foo, bar, baz"),
            "[foo],[bar],[baz]"
        );
        assert_eq!(
            driver.quote_identifier("foo.bar, baz, fizz"),
            "[foo].[bar],[baz],[fizz]"
        );
    }

    #[test]
    fn test_quote_identifiers_bracket_quote() {
        let driver = MSSQL::new();

        assert_eq!(
            driver.quote_identifiers(vec![
                "\tfoo. bar".to_string(),
                "baz".to_string(),
                "fizz.\n\tbuzz.baz".to_string(),
            ]),
            vec![
                "[foo].[bar]".to_string(),
                "[baz]".to_string(),
                "[fizz].[buzz].[baz]".to_string(),
            ]
        );
    }
}