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extern crate serde;
extern crate serde_json;

pub fn new() -> JsonService {
    JsonService{}
}

pub struct JsonService {}

impl JsonService {

    pub fn to_json<T: Sized + serde::ser::Serialize>(&self, value: &T) -> serde_json::Result<String> {
        serde_json::to_string(value)
    }

    pub fn from_json<'a, T: serde::de::Deserialize<'a>>(&self, s: &'a str) -> serde_json::Result<T> {
        serde_json::from_str(s)
    }

}

#[cfg(test)]
#[macro_use] extern crate serde_derive;

#[cfg(test)]
mod test {

    #[test]
    fn should_serialize() {

        let json = super::new();

        let obj = ColorGroup{
            id: 123,
            color_name: "Red".to_string()
        };

        let json_string = json.to_json(&obj).unwrap();
        println!("Json string: [{}]", json_string);
        assert_eq!("{\"id\":123,\"colorName\":\"Red\"}".to_string(), json_string);

    }

    #[test]
    fn should_deserialize() {

        let json = super::new();

        let json_string = "{\"id\":123,\"colorName\":\"Red\"}".to_string();
        let deserialized: ColorGroup = json.from_json(&json_string).unwrap();

        assert_eq!(123, deserialized.id);
        assert_eq!("Red".to_string(), deserialized.color_name);

    }

    #[derive(Serialize, Deserialize)]
    #[serde(rename_all = "camelCase")]
    struct ColorGroup {
        id: i64,
        color_name: String
    }

}