use std::collections::HashMap;
use std::fs::File;
use std::io::{Seek, SeekFrom};
use std::path::Path;

use sha3::{Digest, Sha3_256};

use ttmp::ttmp_extractor::TtmpExtractor;

pub fn main() {
    let mut sha = Sha3_256::default();
    let arg = std::env::args().skip(1).next().unwrap();
    let file = File::open(&arg).unwrap();
    let extractor = TtmpExtractor::new(file).unwrap();
    let mut zip = extractor.zip().borrow_mut();
    let files = extractor.all_files_sorted();

    let mut data_file = zip.by_name("TTMPD.mpd").unwrap();
    // let mut data = Vec::new();
    // data_file.read_to_end(&mut data).unwrap();
    // let mut cursor = Cursor::new(data);

    std::fs::create_dir_all("files").unwrap();

    let mut hashes: HashMap<String, Vec<SavedFile>> = HashMap::with_capacity(files.len());
    let mut temp = tempfile::tempfile().unwrap();

    let mut last_offset = None;
    for file in files {
        // handle deduped ttmps
        if Some(file.file.mod_offset) == last_offset {
            println!("already seen offset {}", file.file.mod_offset);
            continue;
        }

        last_offset = Some(file.file.mod_offset);

        temp.set_len(0).unwrap();
        temp.seek(SeekFrom::Start(0)).unwrap();

        println!("{:#?}", file);
        // write each file into a temp file, then hash
        // mod files can get quite large, so storing them entirely in memory is probably a bad idea
        // let mut cursor = Cursor::new(Vec::with_capacity(file.file.mod_size));
        // let before = cursor.position();
        // println!("before: {}", before);
        TtmpExtractor::extract_one_into(&file, &mut data_file, &mut temp).unwrap();
        // let after = cursor.position();
        // println!("after: {}", after);
        // println!("size: {}", after - before);

        // let data = cursor.into_inner();
        // sha.update(&data);
        temp.seek(SeekFrom::Start(0)).unwrap();
        std::io::copy(&mut temp, &mut sha).unwrap();
        temp.seek(SeekFrom::Start(0)).unwrap();
        let hash = sha.finalize_reset();
        let hash = hex::encode(&*hash);
        let new = !hashes.contains_key(&hash);
        let saved = SavedFile {
            game_path: file.file.full_path.clone(),
            group: file.group.map(ToOwned::to_owned),
            option: file.option.map(ToOwned::to_owned),
        };
        hashes.entry(hash.clone()).or_default().push(saved);

        if new {
            let path = Path::new("files").join(&hash);
            println!("writing {}", path.to_string_lossy());
            std::io::copy(&mut temp, &mut File::create(&path).unwrap()).unwrap();
        }
    }

    println!("{:#?}", hashes);
}

#[derive(Debug)]
pub struct SavedFile {
    pub game_path: String,
    pub group: Option<String>,
    pub option: Option<String>,
}