//! `ToSql` and `FromSql` implementation for [`url::Url`].
use url::Url;
use crate::Result;
use crate::types::{FromSql, FromSqlError, FromSqlResult, ToSql, ToSqlOutput, ValueRef};

/// Serialize `Url` to text.
impl ToSql for Url {
    fn to_sql(&self) -> Result<ToSqlOutput<'_>> {
        Ok(ToSqlOutput::from(self.as_str()))
    }
}

/// Deserialize text to `Url`.
impl FromSql for Url {
    fn column_result(value: ValueRef<'_>) -> FromSqlResult<Self> {
        match value {
            ValueRef::Text(s) => Url::parse(s),
            _ => return Err(FromSqlError::InvalidType),
        }
        .map_err(|err| FromSqlError::Other(Box::new(err)))
    }
}

#[cfg(test)]
mod test {
    use url::{Url, ParseError};
    use crate::{Connection, params, Error, Result};

    fn checked_memory_handle() -> Connection {
        let db = Connection::open_in_memory().unwrap();
        db.execute_batch("CREATE TABLE urls (i INTEGER, v TEXT)")
            .unwrap();
        db
    }

    fn get_url(db: &Connection, id: i64) -> Result<Url> {
        db.query_row(
            "SELECT v FROM urls WHERE i = ?",
            params![id],
            |r| r.get(0),
        )
    }

    #[test]
    fn test_sql_url() {
        let db = &checked_memory_handle();

        let url0 = Url::parse("http://www.example1.com").unwrap();
        let url1 = Url::parse("http://www.example1.com/👌").unwrap();
        let url2 = "http://www.example2.com/👌";

        db.execute(
            "INSERT INTO urls (i, v) VALUES (0, ?), (1, ?), (2, ?), (3, ?)",
            // also insert a non-hex encoded url (which might be present if it was
            // inserted separately)
            params![url0, url1, url2, "illegal"],
        )
        .unwrap();

        assert_eq!(get_url(db, 0).unwrap(), url0);

        assert_eq!(get_url(db, 1).unwrap(), url1);

        // Should successfully read it, even though it wasn't inserted as an
        // escaped url.
        let out_url2: Url = get_url(db, 2).unwrap();
        assert_eq!(out_url2, Url::parse(url2).unwrap());

        // Make sure the conversion error comes through correctly.
        let err = get_url(db, 3).unwrap_err();
        match err {
            Error::FromSqlConversionFailure(_, _, e) => {
                assert_eq!(
                    *e.downcast::<ParseError>().unwrap(),
                    ParseError::RelativeUrlWithoutBase,
                );
            }
            e => {
                panic!("Expected conversion failure, got {}", e);
            }
        }
    }
}