use crate::optional_data_line;

#[derive(Debug, Eq, PartialEq)]
pub struct Dialogue {
    pub id: String,
    pub contents: String,
    pub name: Option<String>,
}

impl From<String> for Dialogue {
    #[inline]
    fn from(string: String) -> Dialogue {
        let mut lines: Vec<&str> = string.lines().collect();
        let id = lines[0].replace("DLG ", "").to_string();

        let name = if lines.last().unwrap().starts_with("NAME ") {
            Some(lines.pop().unwrap().replace("NAME ", ""))
        } else {
            None
        };

        let contents = lines[1..].join("\n");

        Dialogue { id, contents, name }
    }
}

impl ToString for Dialogue {
    #[inline]
    fn to_string(&self) -> String {
        format!(
            "DLG {}\n{}{}",
            self.id,
            self.contents,
            optional_data_line("NAME", self.name.as_ref())
        )
    }
}

#[cfg(test)]
mod test {
    use crate::dialogue::Dialogue;

    #[test]
    fn test_dialogue_from_string() {
        let output = Dialogue::from(
            "DLG h\nhello\nNAME not a dialogue name\nNAME a dialogue name".to_string()
        );

        let expected = Dialogue {
            id: "h".to_string(),
            contents: "hello\nNAME not a dialogue name".to_string(),
            name: Some("a dialogue name".to_string())
        };

        assert_eq!(output, expected);
    }

    #[test]
    fn test_dialogue_to_string() {
        let output = Dialogue {
            id: "y".to_string(),
            contents: "This is a bit of dialogue,\nblah blah\nblah blah".to_string(),
            name: Some("a dialogue name".to_string())
        }.to_string();

        let expected = "DLG y\nThis is a bit of dialogue,\nblah blah\nblah blah\nNAME a dialogue name".to_string();

        assert_eq!(output, expected);
    }
}