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use memedb_core;
use rayon::prelude::*;
use std::collections::HashSet;
use std::fs;
//use std::iter::FromIterator;
use std::path::{Path, PathBuf};

extern crate rayon;

pub fn read_file_tags(path: &Path) -> HashSet<String> {
    memedb_core::read_tags(path).unwrap()
}

pub fn read_files_tags(files: HashSet<&Path>) -> HashSet<String> {
    files
        .into_par_iter()
        .map(|path| memedb_core::read_tags(path).unwrap())
        .flatten()
        .collect()
}

pub fn read_dir_tags(dir_path: &Path) -> HashSet<String> {
    fs::read_dir(dir_path)
        .unwrap()
        .map(|file| file.unwrap().path())
        .collect::<HashSet<_>>()
        .par_iter()
        .map(|path| memedb_core::read_tags(path.as_path()).unwrap())
        .flatten()
        .collect()
}

pub fn write_file_tags(path: &Path, tags: HashSet<String>) -> HashSet<String> {
    memedb_core::write_tags(path, &tags).unwrap();
    memedb_core::read_tags(path).unwrap()
}

pub fn add_file_tags(path: &Path, tags: HashSet<String>) -> HashSet<String> {
    let mut actual_tags: HashSet<String> = memedb_core::read_tags(path).unwrap();
    actual_tags.par_extend(tags);
    memedb_core::write_tags(path, &actual_tags).unwrap();
    memedb_core::read_tags(path).unwrap()
}

pub fn delete_file_tags(path: &Path, tags: HashSet<String>) -> HashSet<String> {
    let actual_tags = memedb_core::read_tags(path)
        .unwrap()
        .into_par_iter()
        .filter(|tag| !tags.contains(tag))
        .collect();
    memedb_core::write_tags(path, &actual_tags).unwrap();
    memedb_core::read_tags(path).unwrap()
}

pub fn read_files_by_tags(files: HashSet<&Path>, tags: HashSet<String>) -> HashSet<&Path> {
    files
        .into_par_iter()
        .filter(|path| {
            memedb_core::read_tags(path)
                .unwrap()
                .par_iter()
                .any(|tag| tags.contains(tag))
        })
        .collect()
}

pub fn read_dir_by_tags(dir_path: &Path, tags: HashSet<String>) -> HashSet<PathBuf> {
    fs::read_dir(dir_path)
        .unwrap()
        .map(|file| file.unwrap().path())
        .filter(|file| {
            memedb_core::read_tags(file.as_path())
                .unwrap()
                .par_iter()
                .any(|tag| tags.contains(tag))
        })
        .collect()
}

#[cfg(test)]
mod tests {
    use super::*;

    #[test]
    fn test_read_tags() {
        let path = Path::new("tests/3.jpg");
        let mut res = HashSet::new();
        res.insert("lol".to_string());
        res.insert("xd".to_string());
        assert_eq!(read_file_tags(path), res)
    }

    #[test]
    fn test_read_all_tags() {
        let path = Path::new("tests");
        let mut res = HashSet::new();
        res.insert("lol".to_string());
        //res.insert("xd".to_string());
        assert_eq!(read_dir_tags(path), res)
    }

    #[test]
    fn test_write_tags() {
        let path = Path::new("tests/4.png");
        let mut tags = HashSet::new();
        let mut res = HashSet::new();
        tags.insert("lol".to_string());
        tags.insert("xd".to_string());
        res.insert("lol".to_string());
        res.insert("xd".to_string());
        write_file_tags(path, tags);
        assert_eq!(read_file_tags(path), res)
    }

    #[test]
    fn test_add_tags() {
        let path = Path::new("tests/4.png");
        let res = read_file_tags(path);
        let mut tags = HashSet::new();
        tags.insert("ahh".to_string());
        tags.insert("xd".to_string());
        add_file_tags(path, tags);
        assert_eq!(read_file_tags(path), res)
    }

    #[test]
    fn test_delete_tags() {
        let path = Path::new("tests/4.png");
        let res = read_file_tags(path);
        let mut tags = HashSet::new();
        tags.insert("ahh".to_string());
        tags.insert("xd".to_string());
        delete_file_tags(path, tags);
        assert_eq!(read_file_tags(path), res)
    }

    #[test]
    fn test_read_files_by_tags() {
        let mut files = HashSet::new();
        let mut tags = HashSet::new();
        let mut dir_res = HashSet::new();
        tags.insert("xd".to_string());
        tags.insert("ahh".to_string());
        files.insert(Path::new("tests\\3.jpg"));
        files.insert(Path::new("tests\\4.png"));
        dir_res.insert(Path::new("tests\\3.jpg"));
        dir_res.insert(Path::new("tests\\4.png"));
        assert_eq!(read_files_by_tags(files, tags), dir_res)
    }
}