// Prevents additional console window on Windows in release, DO NOT REMOVE!!
#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]

use std::time::{UNIX_EPOCH};
use std::os::unix::fs::PermissionsExt;

// Learn more about Tauri commands at https://tauri.app/v1/guides/features/command
#[tauri::command]
fn greet(name: &str) -> String {
    format!("Hello, {}! You've been greeted from Rust!", name)
}

#[derive(Debug, serde::Serialize)]
struct EntryMetaData {
    name: String,
    path: String,
    size: u64,
    is_directory: bool,
    is_file: bool,
    is_symlink: bool,
    directory_item_count: u64,
    permission: String,
    created: u64,
    modified: u64,
    accessed: u64,
}

#[tauri::command]
fn get_files(
    _window: tauri::Window,
    directory: &str,
) -> Vec<EntryMetaData> {
    use std::fs;
    use std::path::Path;

    let path = Path::new(directory);

    // Read the entries in the directory
    let entries = fs::read_dir(path).unwrap();

    let mut data: Vec<EntryMetaData> = vec![];

    for entry in entries {
        let entry = entry.unwrap();
        let metadata = entry.metadata().unwrap();

        let mode = metadata.permissions().mode();
        let permission = format!(
            "{:04o} ({}{}{})",
            mode,
            if mode & 0o400 != 0 { 'r' } else { '-' },
            if mode & 0o200 != 0 { 'w' } else { '-' },
            if mode & 0o100 != 0 { 'x' } else { '-' },
        );

        let mut directory_item_count = 0 as u64;
        if metadata.is_dir() {
            if let Ok(dir_entries) = fs::read_dir(entry.path()) {
                directory_item_count = dir_entries.count() as u64;
            }
        }

        data.push(EntryMetaData{
            name: entry.file_name().to_string_lossy().to_string(),
            path: entry.path().to_string_lossy().to_string(),
            size: metadata.len(),
            is_directory: metadata.is_dir(),
            is_file: metadata.is_file(),
            is_symlink: metadata.is_symlink(),
            directory_item_count,
            permission,
            created: metadata.created().unwrap().duration_since(UNIX_EPOCH).unwrap().as_secs(),
            modified: metadata.modified().unwrap().duration_since(UNIX_EPOCH).unwrap().as_secs(),
            accessed: metadata.accessed().unwrap().duration_since(UNIX_EPOCH).unwrap().as_secs(),
        });
    }

    return data;
}

#[tauri::command]
fn open_file(
    _window: tauri::Window,
    path: &str,
) -> bool {
    use std::process::Command;
    use std::env;

    let os = env::consts::OS;

    match os {
        "linux" => {
            Command::new("xdg-open").arg(path).output()
                .expect("Unable to open file");

            return true;
        },
        "macos" => {
            Command::new("open").arg(path).output()
                .expect("Unable to open file");

            return true;
        },
        "windows" => {
            Command::new("cmd").arg("/C").arg("start").arg(path).output()
                .expect("Unable to open file");

            return true;
        },
        _ => {
            println!("Unsupported operating system: {}", os);

            return false;
        }
    }
}

fn main() {
    use tauri::Manager;
    tauri::Builder::default()
        .setup(|app| {
            #[cfg(debug_assertions)] // only include this code on debug builds
            {
                let window = app.get_window("main").unwrap();
                window.open_devtools();
            }
            Ok(())
        })
        .invoke_handler(tauri::generate_handler![
            get_files,
            open_file
        ])
        .run(tauri::generate_context!())
        .expect("error while running tauri application");

}