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//! Disk initializer application
//!
//! This app is in charge of generating a valid disk image from a file name, a size and a template directory (containing files that should be on the disk image)
//!
//! The disk image contains a standard GPT partition layout and a FAT filesystem.
//! From the disk size, it chooses a FAT filesystem that may be appropriate to fit in it.
//!
//! Usage: <disk_name> <disk_size> <template_path>
use std::env;
use std::fs::OpenOptions;
use std::io;
use std::io::prelude::*;
use std::fs;
use std::path::{Path, PathBuf};

use storage_device::storage_device::{StorageDevice, StorageBlockDevice};

use libfat::FatFileSystemResult;
use libfat::filesystem::FatFileSystem;
use libfat::FatFsType;
use libfat::directory::File as FatFile;

mod gpt;

use gpt::{PartitionIterator, PartitionManager};

/// Size of a block.
const BLOCK_SIZE: usize = 512;
/// Size of an AHCI block in u64.
const BLOCK_SIZE_U64: u64 = BLOCK_SIZE as u64;


/// Write a std file to FAT filesystem.
fn write_file_to_filesystem<S>(
    fs: &FatFileSystem<S>,
    mut file: FatFile,
    path: &str,
) -> FatFileSystemResult<()>  where S: StorageDevice {
    let mut f = OpenOptions::new()
        .read(true)
        .write(false)
        .open(path)
        .unwrap();

    let mut base_buffer = Vec::new();
    f.read_to_end(&mut base_buffer).unwrap();
    file.write(fs, 0, &base_buffer, true)?;

    Ok(())
}

/// Write the template directory content to a FAT fileystem
fn write_tempate_to_filesystem<S>(filesystem: &FatFileSystem<S>, dir: &Path, filesystem_path: &mut PathBuf) -> io::Result<()> where S: StorageDevice {
    if dir.is_dir() {
        for entry in fs::read_dir(dir)? {
            let entry = entry?;
            let path = entry.path();

            let mut filesystem_entry_path = filesystem_path.clone();
            filesystem_entry_path.push(entry.file_name());

            let filesystem_entry_path_str = filesystem_entry_path.to_str().unwrap();
            if path.is_dir() {
                filesystem.create_directory(filesystem_entry_path_str).expect("Cannot create directory in the filesystem");
                write_tempate_to_filesystem(filesystem, &path, &mut filesystem_entry_path)?;
            } else {
                filesystem.create_file(filesystem_entry_path_str).expect("Cannot create file in the filesystem");
                let file = filesystem.open_file(filesystem_entry_path_str).expect("Cannot open file in the filesystem");
                write_file_to_filesystem(filesystem, file, path.to_str().unwrap()).expect("Cannot write file to filesystem");
            }
        }
    }
    Ok(())
}

fn main() {
    env_logger::init();

    if env::args().len() < 4 {
        println!("usage: <disk_name> <disk_size> <template_path>");
        std::process::exit(1);
    }

    let file_name = env::args().nth(1).expect("File name is expected");
    let file_size = env::args().nth(2).expect("Disk size is expected");
    let template_path = env::args().nth(3).expect("Template path is expected");

    let file_size = u64::from_str_radix(file_size.as_str(), 10).expect("Cannot parse file size");
    let file =  OpenOptions::new().create(true).read(true).write(true).open(file_name.clone()).expect("Cannot create file");
    // Set the file size
    file.set_len(file_size).expect("Cannot set file size");

    let mut system_device = StorageBlockDevice::new(file);

    let mut part_manager = PartitionManager::new(&mut system_device);

    // Initialize GPT header
    part_manager
        .initialize()
        .expect("Disk initialization failed");

    let mut partition_iterator = PartitionIterator::new(&mut system_device).expect("Invalid GPT");

    // Now get the first partition and format it to FAT32
    let partition_option = partition_iterator.next().unwrap();

    let partition = partition_option.expect("Invalid partition while iterating");
    let partition_start = partition.first_lba * BLOCK_SIZE_U64;
    let partition_len = (partition.last_lba * BLOCK_SIZE_U64) - partition_start;

    libfat::format_partition(
        system_device,
        FatFsType::Fat32,
        partition_start,
        partition_len,
    )
    .expect("Format issue in libfat");

    // Now that the device have been dropped the filesystem has been written to disk
    // We reopen the file to feed it with the template we have.

    let file = OpenOptions::new().read(true).write(true).open(file_name).expect("Cannot open output disk image");
    let system_device = StorageBlockDevice::new(file);
    let filesystem = libfat::get_raw_partition_with_start(system_device, partition_start, partition_len).expect("Open issue in libfat");
    let mut filesystem_path = PathBuf::new();
    filesystem_path.push("/");

    write_tempate_to_filesystem(&filesystem, Path::new(&template_path), &mut filesystem_path).expect("Failed to write template to filesystem");
}