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extern crate serde;
pub extern crate serde_json;
extern crate thiserror;

use thiserror::Error;

mod read;
mod write;

pub use read::JsonSeqReader;
pub use write::JsonSeqWriter;

/// An error when reading or writing
#[derive(Error, Debug)]
pub enum Error {
    /// An underlying IO error
    #[error("An underlying IO error")]
    IOError(#[from] std::io::Error),

    /// Error when decode to/from JSON.
    #[error("Error when decode to/from JSON.")]
    JsonError(#[from] serde_json::Error),
}

#[cfg(test)]
mod tests {
    use super::*;
    use serde_json::json;
    use std::io::Cursor;

    #[test]
    fn roundtrip1() {
        let buf = Vec::new();
        let mut wtr = JsonSeqWriter::new(buf);

        wtr.write_item(&json!({"foo": "bar"})).unwrap();
        wtr.write_item(&json!([1, 2, "c"])).unwrap();

        let buf = wtr.into_inner();
        let mut rdr = JsonSeqReader::new(Cursor::new(buf));

        assert_eq!(rdr.read_item().unwrap().unwrap(), json!({"foo": "bar"}));
        assert_eq!(rdr.read_item().unwrap().unwrap(), json!([1, 2, "c"]));
        assert_eq!(rdr.read_item().unwrap(), None);
        assert_eq!(rdr.read_item().unwrap(), None);
    }
}