use std::fs::File;
use std::io::{BufReader, BufWriter};
use crate::{filename, err, DB, uid};
use crate::{VideoStore, VideoMeta, VideoMetaEntry};

impl VideoStore for DB {
    fn new_video(name: &str, desc: &str) -> err::Result<()> {
        let fname = filename();
        let file = File::open(&fname)?;
        let reader = BufReader::new(file);

        // Messing with data we care about
        let id = uid()?;
        let mut data: DB = serde_json::from_reader(reader)?;
        let entry = VideoMetaEntry {
            name: name.to_string(),
            desc: if desc.len() != 0 { None } else { Some(desc.to_string()) }
        };
        // update in mem-cache
        data.videos.insert(id, entry);
        // update the content on disk
        let file = File::open(&fname)?;
        let writer = BufWriter::new(file);
        serde_json::to_writer(writer, &data)?;
        Ok(())
    }
    fn del_video(id: String) -> err::Result<()> {
        let fname = filename();
        let file = File::open(&fname)?;
        let reader = BufReader::new(file);

        let mut data: DB = serde_json::from_reader(file)?;
        data.videos.remove(id);

        let file = File::open(&fname)?;
        let writer = BufWriter::new(file);
        serde_json::to_writer(writer, &data)?;
        Ok(())
    }
    fn get_video(id: Option<String>, name: Option<&str>) -> err::Result<VideoMeta> {
        todo!()
    }
    fn rename_video(id: String, new: &str) -> err::Result<()> {
        todo!()
    }
    fn redescribe_video(id: String, new: &str) -> err::Result<()> {
        todo!()
    }
}