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use crate::{
coordinates::QuantizedCoordinates,
epoch::format_body as format_epoch,
error::FormattingError,
fmt_ionex,
prelude::{Header, Key, Record},
};
use std::io::{BufWriter, Write};
impl Record {
/// Format IONEX [Record] into [Write]able interface, using efficient buffering.
/// This requires reference to attached [Header] section.
pub fn format<W: Write>(
&self,
header: &Header,
w: &mut BufWriter<W>,
) -> Result<(), FormattingError> {
const FORMATTED_OFFSET: usize = 5;
// NB: this will not work if
// - grid accuracy changes between regions or epochs
// - map is not 2D
// - does not support scaling update very smoothly
let (latitude_min, latitude_max) = header.grid.latitude.minmax();
let (longitude_min, longitude_max) = header.grid.longitude.minmax();
let mut line_offset;
let mut longitude_ptr_ddeg;
let mut has_rms = false;
// TEC MAPs. Grid browsing:
// - browse latitude (from southernmost to northernmost)
// - browse longitude (from westernmost to easternmost)
for (nth_map, epoch) in self.epochs_iter().enumerate() {
writeln!(
w,
"{}",
fmt_ionex(&format!("{:6}", nth_map + 1), "START OF TEC MAP")
)?;
writeln!(
w,
"{}",
fmt_ionex(&format_epoch(epoch), "EPOCH OF CURRENT MAP")
)?;
let mut latitude_ptr_ddeg = latitude_max;
while latitude_ptr_ddeg >= latitude_min {
line_offset = 0;
longitude_ptr_ddeg = longitude_min;
// grid specs
writeln!(
w,
"{}",
fmt_ionex(
&format!(
" {:6.1}{:6.1}{:6.1}{:6.1}{:6.1}",
latitude_ptr_ddeg,
header.grid.longitude.start,
header.grid.longitude.end,
header.grid.longitude.spacing,
header.grid.altitude.start,
),
"LAT/LON1/LON2/DLON/H"
)
)?;
while longitude_ptr_ddeg <= longitude_max {
// obtain coordinates
let coordinates = QuantizedCoordinates::from_decimal_degrees(
latitude_ptr_ddeg,
longitude_ptr_ddeg,
header.grid.altitude.start,
);
let key = Key { epoch, coordinates };
// format map
if let Some(tec) = self.get(&key) {
has_rms |= tec.rms.is_some();
write!(w, "{:5}", tec.tecu.value)?;
} else {
write!(w, " 9999")?; // standardized
}
line_offset += FORMATTED_OFFSET;
if line_offset >= 80 {
write!(w, "{}", '\n')?;
line_offset = 0;
}
longitude_ptr_ddeg += header.grid.longitude.spacing;
}
if line_offset != 80 {
// needs termination
write!(w, "{}", '\n')?;
}
latitude_ptr_ddeg += header.grid.latitude.spacing;
}
writeln!(
w,
"{}",
fmt_ionex(&format!("{:6}", nth_map + 1), "END OF TEC MAP")
)?;
}
// RMS MAP (if any) Grid browsing:
// - browse latitude (from southernmost to northernmost)
// - browse longitude (from westernmost to easternmost)
if has_rms {
for (nth_map, epoch) in self.epochs_iter().enumerate() {
writeln!(
w,
"{}",
fmt_ionex(&format!("{:6}", nth_map + 1), "START OF RMS MAP")
)?;
writeln!(
w,
"{}",
fmt_ionex(&format_epoch(epoch), "EPOCH OF CURRENT MAP")
)?;
let mut latitude_ptr_ddeg = latitude_max;
while latitude_ptr_ddeg >= latitude_min {
line_offset = 0;
longitude_ptr_ddeg = longitude_min;
// grid specs
writeln!(
w,
"{}",
fmt_ionex(
&format!(
" {:6.1}{:6.1}{:6.1}{:6.1}{:6.1}",
latitude_ptr_ddeg,
header.grid.longitude.start,
header.grid.longitude.end,
header.grid.longitude.spacing,
header.grid.altitude.start,
),
"LAT/LON1/LON2/DLON/H"
)
)?;
while longitude_ptr_ddeg <= longitude_max {
// obtain coordinates
let coordinates = QuantizedCoordinates::from_decimal_degrees(
latitude_ptr_ddeg,
longitude_ptr_ddeg,
header.grid.altitude.start,
);
let key = Key { epoch, coordinates };
// format map
if let Some(tec) = self.get(&key) {
if let Some(rms) = tec.rms {
write!(w, "{:5}", rms.value)?;
} else {
write!(w, " 9999")?; // standardized
}
} else {
write!(w, " 9999")?; // standardized
}
line_offset += FORMATTED_OFFSET;
if line_offset >= 80 {
write!(w, "{}", '\n')?;
line_offset = 0;
}
longitude_ptr_ddeg += header.grid.longitude.spacing;
}
if line_offset != 80 {
// needs termination
write!(w, "{}", '\n')?;
}
latitude_ptr_ddeg += header.grid.latitude.spacing;
}
writeln!(
w,
"{}",
fmt_ionex(&format!("{:6}", nth_map + 1), "END OF RMS MAP")
)?;
}
}
// mark END of file
writeln!(w, "{}", fmt_ionex("", "END OF FILE"))?;
Ok(())
}
}