use std::{fs, path::PathBuf};

use once_cell::sync::Lazy;
use tempfile::NamedTempFile;

use musichoard::{
    collection::{artist::Artist, Collection},
    database::{
        json::{backend::JsonDatabaseFileBackend, JsonDatabase},
        IDatabase,
    },
};

use crate::testlib::COLLECTION;

pub static DATABASE_TEST_FILE: Lazy<PathBuf> =
    Lazy::new(|| fs::canonicalize("./tests/files/database/database.json").unwrap());

fn expected() -> Collection {
    let mut expected = COLLECTION.to_owned();
    for artist in expected.iter_mut() {
        artist.albums.clear();
    }
    expected
}

#[test]
fn save() {
    let file = NamedTempFile::new().unwrap();

    let backend = JsonDatabaseFileBackend::new(file.path());
    let mut database = JsonDatabase::new(backend);

    let write_data = COLLECTION.to_owned();
    database.save(&write_data).unwrap();

    let expected = fs::read_to_string(&*DATABASE_TEST_FILE).unwrap();
    let actual = fs::read_to_string(file.path()).unwrap();

    assert_eq!(actual, expected);
}

#[test]
fn load() {
    let backend = JsonDatabaseFileBackend::new(&*DATABASE_TEST_FILE);
    let database = JsonDatabase::new(backend);

    let read_data: Vec<Artist> = database.load().unwrap();

    let expected = expected();
    assert_eq!(read_data, expected);
}

#[test]
fn reverse() {
    let file = NamedTempFile::new().unwrap();

    let backend = JsonDatabaseFileBackend::new(file.path());
    let mut database = JsonDatabase::new(backend);

    let write_data = COLLECTION.to_owned();
    database.save(&write_data).unwrap();
    let read_data: Vec<Artist> = database.load().unwrap();

    // Album data is not saved into database.
    let expected = expected();
    assert_eq!(read_data, expected);
}