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//! Parsing the [Header](http://www.wwpdb.org/documentation/file-format-content/format33/sect2.html#HEADER).
//! The HEADER record uniquely identifies a PDB entry through the idCode field.
//! This record also provides a classification for the entry. Finally, it contains
//! the date when the coordinates were deposited to the PDB archive.
//!
//! # Record Format
//!
//! | COLUMNS | DATA  TYPE   | FIELD          | DEFINITION                                |
//! |---------|--------------|----------------|-------------------------------------------|
//! | 1 -  6  | Record name  | HEADER         |                                           |
//! | 11 - 50 | String(40)/`String`   | `classification` | Classifies the molecule(s).               |
//! | 51 - 59 | Date/`chrono::NaiveDate`         | `deposition_date`        | Deposition date. This is the date the coordinates  were received at the PDB.   |
//! | 63 - 66 | IDcode/`String`      | `id_code`         | This identifier is unique within the PDB. |
use crate::common::parser::{parse_date, FieldParser};
use crate::types::*;
use nom::{bytes::complete::take, character::complete::multispace1, combinator::map, IResult};

pub struct HeaderParser;

impl FieldParser for HeaderParser {
    type Output = Header;
    fn parse(inp: &str) -> IResult<&str, Self::Output> {
        let (inp, _) = take(4usize)(inp)?;
        let (inp, classification) = map(map(take(40usize), str::trim), str::to_owned)(inp)?;
        let (inp, deposition_date) = parse_date(inp)?;
        let (inp, _) = take(3usize)(inp)?;
        let (inp, id_code) = map(take(4usize), str::to_owned)(inp)?;
        let (inp, _) = multispace1(inp)?;
        Ok((
            inp,
            Header {
                classification,
                deposition_date,
                id_code,
            },
        ))
    }
}

pub struct HeaderParserStreaming;
pub struct HeaderParserParallel;

#[cfg(test)]
mod tests {
    use super::*;
    use chrono::NaiveDate;
    #[test]
    fn test_parse_header() {
        let i = "    VIRAL PROTEIN                           27-MAR-98   1A8O              \nTITLE     HIV CAPSID C-TERMINAL DOMAIN                                          ";
        let (i, r) = HeaderParser::parse(i).unwrap();
        assert_eq!(
            i.to_owned(),
            "TITLE     HIV CAPSID C-TERMINAL DOMAIN                                          "
                .to_owned()
        );
        assert_eq!(
            r,
            Header {
                classification: "VIRAL PROTEIN".to_owned(),
                deposition_date: NaiveDate::from_ymd(1998i32, 3u32, 27u32),
                id_code: "1A8O".to_owned()
            }
        )
    }
}