use crate::utils::temp_dir;
use leveldb::database::batch::{Batch, WriteBatch, WriteBatchIterator};
use leveldb::database::Database;
use leveldb::options::{Options, ReadOptions, WriteOptions};

#[test]
fn test_write_batch() {
    let mut opts = Options::new();
    opts.create_if_missing = true;
    let tmp = temp_dir("writebatch");
    let database = &Database::open(tmp.path(), &opts).unwrap();
    let batch = WriteBatch::new();

    batch.put(&1, &[1]);
    batch.put(&2, &[2]);
    batch.delete(&1);

    let wopts = WriteOptions::new();
    let ack = database.write(&wopts, &batch);
    assert!(ack.is_ok());

    let read_opts = ReadOptions::new();
    let res = database.get(&read_opts, &2);

    match res {
        Ok(data) => {
            assert!(data.is_some());
            let data = data.unwrap();
            assert_eq!(data, vec!(2));
        }
        Err(_) => {
            panic!("failed reading data")
        }
    }

    let read_opts2 = ReadOptions::new();
    let res2 = database.get(&read_opts2, &1);
    match res2 {
        Ok(data) => {
            assert!(data.is_none())
        }
        Err(_) => {
            panic!("failed reading data")
        }
    }
}

struct Iter {
    put: i32,
    deleted: i32,
}

impl WriteBatchIterator for Iter {
    fn put_u8(&mut self, _key: &[u8], _value: &[u8]) {
        self.put += 1;
    }

    fn deleted_u8(&mut self, _key: &[u8]) {
        self.deleted += 1;
    }
}

#[test]
fn test_write_batch_iter() {
    let mut opts = Options::new();
    opts.create_if_missing = true;
    let tmp = temp_dir("write_batch");

    let database = &mut Database::open(tmp.path(), &opts).unwrap();
    let mut batch = WriteBatch::new();
    batch.put(&1, &[1]);
    batch.put(&2, &[2]);
    batch.delete(&1);

    let wopts = WriteOptions::new();
    let ack = database.write(&wopts, &batch);
    assert!(ack.is_ok());

    let iter = Box::new(Iter { put: 0, deleted: 0 });
    let iter2 = batch.iterate(iter);

    assert_eq!(iter2.put, 2);
    assert_eq!(iter2.deleted, 1);
}