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use std::collections::{hash_map::Entry, HashMap};
use std::path::{Path, PathBuf};
use crate::fs::{JoshutoDirEntry, JoshutoDirList};
use crate::sort;
pub trait DirectoryHistory {
fn populate_to_root(
&mut self,
path: &Path,
sort_option: &sort::SortOption,
) -> std::io::Result<()>;
fn create_or_update(
&mut self,
path: &Path,
sort_option: &sort::SortOption,
) -> std::io::Result<()>;
fn depreciate_all_entries(&mut self);
}
pub type JoshutoHistory = HashMap<PathBuf, JoshutoDirList>;
impl DirectoryHistory for JoshutoHistory {
fn populate_to_root(
&mut self,
path: &Path,
sort_option: &sort::SortOption,
) -> std::io::Result<()> {
let mut prev: Option<&Path> = None;
for curr in path.ancestors() {
match self.entry(curr.to_path_buf()) {
Entry::Occupied(mut entry) => {
let dirlist = entry.get_mut();
dirlist.reload_contents(sort_option)?;
if let Some(ancestor) = prev.as_ref() {
if let Some(i) = get_index_of_value(&dirlist.contents, ancestor) {
dirlist.index = Some(i);
}
}
prev = Some(curr);
}
Entry::Vacant(entry) => {
let mut dirlist = JoshutoDirList::new(curr.to_path_buf().clone(), sort_option)?;
if let Some(ancestor) = prev.as_ref() {
if let Some(i) = get_index_of_value(&dirlist.contents, ancestor) {
dirlist.index = Some(i);
}
}
entry.insert(dirlist);
prev = Some(curr);
}
}
}
Ok(())
}
fn create_or_update(
&mut self,
path: &Path,
sort_option: &sort::SortOption,
) -> std::io::Result<()> {
match self.entry(path.to_path_buf()) {
Entry::Occupied(mut entry) => {
let dirlist = entry.get_mut();
dirlist.reload_contents(sort_option)?;
}
Entry::Vacant(entry) => {
let mut dirlist = JoshutoDirList::new(path.to_path_buf(), sort_option)?;
entry.insert(dirlist);
}
}
Ok(())
}
fn depreciate_all_entries(&mut self) {
self.iter_mut().for_each(|(_, v)| v.depreciate());
}
}
fn get_index_of_value(arr: &[JoshutoDirEntry], val: &Path) -> Option<usize> {
arr.iter().enumerate().find_map(|(i, dir)| {
if dir.file_path() == val {
Some(i)
} else {
None
}
})
}
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