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

use once_cell::sync::Lazy;

use musichoard::{
    collection::{artist::Artist, Collection},
    external::database::sql::{backend::SqlDatabaseSqliteBackend, SqlDatabase},
    interface::database::IDatabase,
};
use tempfile::NamedTempFile;

use crate::{copy_file_into_temp, testlib::COLLECTION};

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

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

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

    let backend = SqlDatabaseSqliteBackend::new(file.path()).unwrap();
    let mut database = SqlDatabase::new(backend).unwrap();

    database.reset().unwrap();
}

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

    let backend = SqlDatabaseSqliteBackend::new(file.path()).unwrap();
    let mut database = SqlDatabase::new(backend).unwrap();

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

#[test]
fn load() {
    let backend = SqlDatabaseSqliteBackend::new(&*DATABASE_TEST_FILE).unwrap();
    let mut database = SqlDatabase::new(backend).unwrap();

    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 = SqlDatabaseSqliteBackend::new(file.path()).unwrap();
    let mut database = SqlDatabase::new(backend).unwrap();

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

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

#[test]
fn reverse_with_reset() {
    let file = copy_file_into_temp(&*DATABASE_TEST_FILE);

    let backend = SqlDatabaseSqliteBackend::new(file.path()).unwrap();
    let mut database = SqlDatabase::new(backend).unwrap();

    let expected: Vec<Artist> = database.load().unwrap();
    database.reset().unwrap();
    database.save(&expected).unwrap();
    let read_data: Vec<Artist> = database.load().unwrap();

    assert_eq!(read_data, expected);
}