1use poulpy_hal::{
  2    layouts::{Data, DataMut, DataRef, FillUniform, MatZnx, ReaderFrom, Reset, WriterTo},
  3    source::Source,
  4};
  5
  6use crate::layouts::{GGLWESwitchingKey, Infos};
  7use byteorder::{LittleEndian, ReadBytesExt, WriteBytesExt};
  8
  9use std::fmt;
 10
 11#[derive(PartialEq, Eq, Clone)]
 12pub struct GGLWETensorKey<D: Data> {
 13    pub(crate) keys: Vec<GGLWESwitchingKey<D>>,
 14}
 15
 16impl<D: DataRef> fmt::Debug for GGLWETensorKey<D> {
 17    fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 18        write!(f, "{}", self)
 19    }
 20}
 21
 22impl<D: DataMut> FillUniform for GGLWETensorKey<D> {
 23    fn fill_uniform(&mut self, source: &mut Source) {
 24        self.keys
 25            .iter_mut()
 26            .for_each(|key: &mut GGLWESwitchingKey<D>| key.fill_uniform(source))
 27    }
 28}
 29
 30impl<D: DataMut> Reset for GGLWETensorKey<D>
 31where
 32    MatZnx<D>: Reset,
 33{
 34    fn reset(&mut self) {
 35        self.keys
 36            .iter_mut()
 37            .for_each(|key: &mut GGLWESwitchingKey<D>| key.reset())
 38    }
 39}
 40
 41impl<D: DataRef> fmt::Display for GGLWETensorKey<D> {
 42    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
 43        writeln!(f, "(GLWETensorKey)",)?;
 44        for (i, key) in self.keys.iter().enumerate() {
 45            write!(f, "{}: {}", i, key)?;
 46        }
 47        Ok(())
 48    }
 49}
 50
 51impl GGLWETensorKey<Vec<u8>> {
 52    pub fn alloc(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> Self {
 53        let mut keys: Vec<GGLWESwitchingKey<Vec<u8>>> = Vec::new();
 54        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
 55        (0..pairs).for_each(|_| {
 56            keys.push(GGLWESwitchingKey::alloc(n, basek, k, rows, digits, 1, rank));
 57        });
 58        Self { keys }
 59    }
 60
 61    pub fn bytes_of(n: usize, basek: usize, k: usize, rows: usize, digits: usize, rank: usize) -> usize {
 62        let pairs: usize = (((rank + 1) * rank) >> 1).max(1);
 63        pairs * GGLWESwitchingKey::<Vec<u8>>::bytes_of(n, basek, k, rows, digits, 1, rank)
 64    }
 65}
 66
 67impl<D: Data> Infos for GGLWETensorKey<D> {
 68    type Inner = MatZnx<D>;
 69
 70    fn inner(&self) -> &Self::Inner {
 71        self.keys[0].inner()
 72    }
 73
 74    fn basek(&self) -> usize {
 75        self.keys[0].basek()
 76    }
 77
 78    fn k(&self) -> usize {
 79        self.keys[0].k()
 80    }
 81}
 82
 83impl<D: Data> GGLWETensorKey<D> {
 84    pub fn rank(&self) -> usize {
 85        self.keys[0].rank()
 86    }
 87
 88    pub fn rank_in(&self) -> usize {
 89        self.keys[0].rank_in()
 90    }
 91
 92    pub fn rank_out(&self) -> usize {
 93        self.keys[0].rank_out()
 94    }
 95
 96    pub fn digits(&self) -> usize {
 97        self.keys[0].digits()
 98    }
 99}
100
101impl<D: DataMut> GGLWETensorKey<D> {
102    // Returns a mutable reference to GLWESwitchingKey_{s}(s[i] * s[j])
103    pub fn at_mut(&mut self, mut i: usize, mut j: usize) -> &mut GGLWESwitchingKey<D> {
104        if i > j {
105            std::mem::swap(&mut i, &mut j);
106        };
107        let rank: usize = self.rank();
108        &mut self.keys[i * rank + j - (i * (i + 1) / 2)]
109    }
110}
111
112impl<D: DataRef> GGLWETensorKey<D> {
113    // Returns a reference to GLWESwitchingKey_{s}(s[i] * s[j])
114    pub fn at(&self, mut i: usize, mut j: usize) -> &GGLWESwitchingKey<D> {
115        if i > j {
116            std::mem::swap(&mut i, &mut j);
117        };
118        let rank: usize = self.rank();
119        &self.keys[i * rank + j - (i * (i + 1) / 2)]
120    }
121}
122
123impl<D: DataMut> ReaderFrom for GGLWETensorKey<D> {
124    fn read_from<R: std::io::Read>(&mut self, reader: &mut R) -> std::io::Result<()> {
125        let len: usize = reader.read_u64::<LittleEndian>()? as usize;
126        if self.keys.len() != len {
127            return Err(std::io::Error::new(
128                std::io::ErrorKind::InvalidData,
129                format!("self.keys.len()={} != read len={}", self.keys.len(), len),
130            ));
131        }
132        for key in &mut self.keys {
133            key.read_from(reader)?;
134        }
135        Ok(())
136    }
137}
138
139impl<D: DataRef> WriterTo for GGLWETensorKey<D> {
140    fn write_to<W: std::io::Write>(&self, writer: &mut W) -> std::io::Result<()> {
141        writer.write_u64::<LittleEndian>(self.keys.len() as u64)?;
142        for key in &self.keys {
143            key.write_to(writer)?;
144        }
145        Ok(())
146    }
147}