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use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
use std::fs::File;
use std::io::{BufWriter, Write};
use std::sync::mpsc::{channel, Sender};
use std::time::Duration;
use walkdir::*;
use std::thread;
use std::option::Option::None;
use crate::vector::FileVector;
use crate::filecache::FileCache;
use crate::searchresult::SearchResult;
use crate::filecounter::filecount;
use crate::text;
use crate::splitter;
use crate::vector;
/// Represents a Index which is ether generated
/// or read from a file.
#[derive(Clone, Debug)]
pub struct Index {
filecache : Vec<FileCache>,
}
impl Default for Index {
fn default() -> Self {
Self::empty()
}
}
#[derive(Clone, Debug, Default, Copy)]
pub enum GenState {
#[default]
Fetching,
Parsing,
Merging
}
impl Index {
pub fn empty() -> Self {
Self {
filecache : Vec::new()
}
}
pub fn generate(input_path : &str, callback : impl Fn(GenState, u8)) -> Self {
let mut nof = 1;
let mut counter = 0;
let mut crawler_handles = Vec::new();
let num_threads = thread::available_parallelism().unwrap().get();
let mut tx_vec : Vec<Sender<String>> = Vec::new();
let mut indexes = Vec::new();
thread::scope(|s| {
let mut nof_handle : Option<_> = Some(s.spawn(|| filecount(input_path)));
let (status_tx, status_rx) = channel();
for _ in 0..num_threads {
let (tx, rx) = channel();
tx_vec.push(tx);
let status_tx = status_tx.clone();
crawler_handles.push(thread::spawn(move || {
let mut filecache : Vec<FileCache> = Vec::new();
loop {
let path = rx.recv().unwrap();
if path.is_empty() {
return Self {
filecache
}
}
let content : String = text::extract_text(path.as_str());
let _ = status_tx.send(());
if content.is_empty() {
continue;
}
let words : Vec<String> = splitter::split_to_words(content);
let fv = FileVector::from_words(words);
filecache.push(FileCache {
path,
vector : fv
});
}
}));
}
let mut next_crawler = 0;
let mut last_p = 0;
for entry in WalkDir::new(input_path)
.into_iter()
.filter_map(|e| e.ok()) {
counter += 1;
if entry.path().is_file() {
tx_vec[next_crawler].send(entry.path().to_str().unwrap().to_string()).ok();
next_crawler += 1;
if next_crawler == num_threads {
next_crawler = 0;
}
match nof_handle {
Some(t) => {
if t.is_finished() {
nof = t.join().unwrap();
nof_handle = None;
} else {
nof_handle = Some(t);
}
}
None => {
// Make sure that we only push a update
// if there is a visual change to the number
// because updating the screen takes a lot
// of time.
let p = counter * 100 / nof;
if p != last_p {
callback(GenState::Fetching, p as u8);
last_p = p;
}
}
}
}
}
let join_handle = s.spawn(|| {
for (i, handle) in crawler_handles.into_iter().enumerate() {
tx_vec[i].send(String::new()).ok();
indexes.push(handle.join().unwrap());
}
});
let mut i = 0;
let mut last_p = 0;
while !join_handle.is_finished() {
if status_rx.recv_timeout(Duration::from_millis(20)).is_ok() {
i += 1;
let p = i * 100 / nof;
if p != last_p {
callback(GenState::Parsing, p as u8);
last_p = p;
}
}
}
callback(GenState::Parsing, 100);
join_handle.join().ok();
});
Index::merge(indexes, |p| { callback(GenState::Merging, p) })
}
pub fn from_file(path : &String) -> Self {
let bytes = std::fs::read(path).expect("could not read index file");
let filecache : Vec<FileCache> = bincode::deserialize(&bytes).unwrap();
Self {
filecache
}
}
pub fn merge(indexes : Vec<Index>, callback : impl Fn(u8)) -> Self {
let max = indexes.len();
let mut filecache = Vec::new();
for (i, index) in indexes.into_iter().enumerate() {
callback((i * 100 / max) as u8);
filecache.extend(index.filecache);
}
callback(100);
Self { filecache }
}
pub fn search(&self, search_args : Vec<String>) -> Vec<SearchResult> {
let mut v : FileVector = FileVector::new();
let mut opt : FileVector = FileVector::new();
for arg in search_args {
let mut hasher = DefaultHasher::new();
let a = arg.trim_start_matches('+');
a.hash(&mut hasher);
let value = hasher.finish();
if arg.starts_with('+') {
opt.insert(value, 1);
} else {
v.insert(value, 1);
}
}
let mut results : Vec<SearchResult> = Vec::new();
for filecache in self.filecache.iter() {
let mut r = SearchResult { priority : 0, path : filecache.path.clone() };
r.priority = vector::match_vector(&v, &filecache.vector);
if r.priority > 0 {
r.priority += vector::scalar_product(&opt, &filecache.vector);
results.push(r);
}
}
results.sort_by(|a, b| b.priority.cmp(&a.priority));
results
}
pub fn save(&self, path: String) {
let index_file = File::create(path).expect("could not open output file");
let mut file = BufWriter::new(index_file);
file.write_all(&bincode::serialize(&self.filecache).unwrap()).ok();
file.flush().ok();
}
pub fn num_files(&self) -> usize {
self.filecache.len()
}
}
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