dwipe 0.1.4

Fast, cross-platform disk cleanup tool with interactive UI
Documentation 
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use crate::ui::constants::TEXT_PARENT_DIR;

use crate::fs::folder_entry::{FolderEntry, FolderEntryType};
use std::cmp::Ordering;
use std::collections::HashMap;

use super::SortBy;

#[derive(Debug, Clone)]
pub struct Folder {
    pub title: String,
    pub cursor_index: usize,
    pub sorted_by: Option<SortBy>,
    pub entries: Vec<FolderEntry>,
    pub has_error: bool,
    pub file_type_map: HashMap<String, u64>,
}

impl Folder {
    pub fn new(title: String) -> Self {
        Folder {
            title,
            cursor_index: 0,
            sorted_by: None,
            entries: vec![FolderEntry {
                kind: FolderEntryType::Parent,
                title: String::from(TEXT_PARENT_DIR),
                size: None,
                is_loaded: true,
            }],
            has_error: false,
            file_type_map: HashMap::new(),
        }
    }

    pub fn get_size(&self) -> u64 {
        self.entries
            .iter()
            .fold(0, |acc, entry| acc + entry.size.unwrap_or(0))
    }

    pub fn get_selected_entry_size(&self) -> u64 {
        self.get_selected_entry().size.unwrap_or(0)
    }

    pub fn remove_selected(&mut self) {
        self.entries.remove(self.cursor_index);
        self.cursor_index = self.cursor_index.min(self.entries.len() - 1);
    }

    pub fn get_selected_entry(&self) -> &FolderEntry {
        if let Some(entry) = self.entries.get(self.cursor_index) {
            entry
        } else {
            panic!("Cursor index out of bounds: {}", self.cursor_index);
        }
    }

    pub fn to_list(&self) -> Vec<FolderEntry> {
        vec![&self.entries]
            .into_iter()
            .flat_map(|v| v.iter().cloned())
            .collect()
    }

    pub fn get_max_entry_size(&self) -> u64 {
        let mut max_entry_size = 0;

        for file in &self.entries {
            if let Some(size) = file.size {
                if size > max_entry_size {
                    max_entry_size = size
                }
            }
        }

        max_entry_size
    }

    pub fn sort_by_title(&mut self) {
        self.entries.sort();
    }

    pub fn sort_by_size(&mut self) {
        self.entries.sort_by(|a, b| {
            if a.kind == FolderEntryType::Parent || b.kind == FolderEntryType::Parent {
                // If either entry is a Parent, it should come before
                if a.kind == FolderEntryType::Parent && b.kind != FolderEntryType::Parent {
                    Ordering::Less
                } else if a.kind != FolderEntryType::Parent && b.kind == FolderEntryType::Parent {
                    Ordering::Greater
                } else {
                    Ordering::Equal
                }
            } else if let (Some(size_a), Some(size_b)) = (a.size, b.size) {
                // Sort by size in descending order
                size_b.cmp(&size_a)
            } else if a.size.is_some() {
                // Entries with size come before those without
                Ordering::Greater
            } else if b.size.is_some() {
                // Entries without size come after those with
                Ordering::Less
            } else {
                // If both entries have no size, maintain their order
                Ordering::Equal
            }
        });
    }

    pub fn append_file_type_size(&mut self, file_type: &String, size: u64) {
        let total_size = self.file_type_map.entry(file_type.to_owned()).or_insert(0);
        *total_size += size;
    }

    fn get_sorted_file_types_by_size(&self) -> Vec<(String, u64)> {
        let mut file_types: Vec<(String, u64)> = self
            .file_type_map
            .iter()
            .map(|(k, &v)| (k.clone(), v))
            .collect();
        file_types.sort_by(|a, b| b.1.cmp(&a.1));
        file_types
    }

    pub fn get_chart_data(&self, threshold: f64, max_items: usize) -> Vec<(String, u64)> {
        let sorted_file_types = self.get_sorted_file_types_by_size();
        let total_size: u64 = sorted_file_types.iter().map(|(_, size)| *size).sum();
        let mut accumulated_size: u64 = 0;
        let mut chart_data: Vec<(String, u64)> = Vec::new();
        let mut rest_size: u64 = 0;

        for (file_type, size) in sorted_file_types.into_iter() {
            if accumulated_size as f64 / total_size as f64 <= threshold
                && chart_data.len() < max_items - 1
            {
                chart_data.push((file_type, size));
                accumulated_size += size;
            } else {
                rest_size += size;
            }
        }

        if rest_size > 0 {
            chart_data.push(("rest".to_string(), rest_size));
        }

        chart_data
    }
}