use tempfile::tempdir;

use anyhow::Result;
use bakare::backup;
use bakare::repository::Repository;
use bakare::test::{assertions::*, source::TestSource};

use proptest::prelude::*;

#[test]
fn restore_multiple_files() -> Result<()> {
    let source = TestSource::new().unwrap();

    source.write_text_to_file("first", "some contents").unwrap();
    source.write_text_to_file("second", "some contents").unwrap();
    source.write_text_to_file("third", "some other contents").unwrap();

    assert_same_after_restore(source.path())
}

#[test]
fn restore_files_after_reopening_repository() -> Result<()> {
    let source = TestSource::new().unwrap();
    let repository_path = &tempdir().unwrap().into_path();
    let restore_target = tempdir().unwrap().into_path();
    Repository::init(repository_path)?;

    let source_file_relative_path = "some file path";
    let original_contents = "some old contents";

    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, original_contents)?;

    restore_all_from_reloaded_repository(&repository_path, &restore_target)?;

    let source_file_full_path = &source.file_path(source_file_relative_path);
    assert_restored_file_contents(repository_path, source_file_full_path, original_contents.as_bytes())
}

#[test]
fn restore_older_version_of_file() -> Result<()> {
    let source = TestSource::new().unwrap();
    let repository_path = tempdir().unwrap().into_path();
    Repository::init(repository_path.as_path())?;

    let source_file_relative_path = "some path";
    let source_file_full_path = source.file_path(source_file_relative_path);
    let old_contents = "some old contents";

    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, old_contents)?;

    let old_item = newest_item(&repository_path, &source_file_full_path)?;
    let old_id = old_item.id();

    let new_contents = "totally new contents";
    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, new_contents)?;

    assert_restored_from_version_has_contents(&repository_path, &source_file_full_path, old_contents.as_bytes(), &old_id)
}

#[test]
fn newer_version_should_be_greater_than_earlier_version() -> Result<()> {
    let source = TestSource::new().unwrap();
    let repository_path = tempdir().unwrap().into_path();
    Repository::init(repository_path.as_path())?;

    let source_file_relative_path = "some path";
    let source_file_full_path = source.file_path(source_file_relative_path);

    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, "old")?;

    let old_item = newest_item(&repository_path, &source_file_full_path)?;
    let old_version = old_item.version();

    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, "new")?;

    let new_item = newest_item(&repository_path, &source_file_full_path)?;
    let new_version = new_item.version();

    assert!(new_version > old_version);

    Ok(())
}

proptest! {
    #[test]
    fn store_duplicated_files_just_once(contents in any::<[u8;3]>()) {
        let source = TestSource::new().unwrap();
        let repository_path = &tempdir().unwrap().into_path();
        Repository::init(repository_path).unwrap();
        assert_eq!(data_weight(&repository_path).unwrap(), 0);

        backup_file_with_byte_contents(&source, &repository_path, "1", &contents).unwrap();
        let first_weight = data_weight(&repository_path).unwrap();
        assert!(first_weight > 0);

        backup_file_with_byte_contents(&source, &repository_path, "2", &contents).unwrap();
        let second_weight = data_weight(&repository_path).unwrap();
        assert_eq!(first_weight, second_weight);

        assert_restored_file_contents(repository_path, &source.file_path("1"), &contents).unwrap();
        assert_restored_file_contents(repository_path, &source.file_path("2"), &contents).unwrap();
    }
}

#[test]
fn restore_latest_version_by_default() -> Result<()> {
    let source = TestSource::new().unwrap();
    let repository_path = &tempdir().unwrap().into_path();
    Repository::init(repository_path)?;

    let source_file_relative_path = "some path";
    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, "old contents")?;
    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, "newer contents")?;
    backup_file_with_text_contents(&source, &repository_path, source_file_relative_path, "newest contents")?;

    let source_file_full_path = &source.file_path(source_file_relative_path);
    assert_restored_file_contents(repository_path, source_file_full_path, b"newest contents")
}

#[test]
fn forbid_backup_of_paths_within_repository() -> Result<()> {
    let repository_path = &tempdir().unwrap().into_path();
    Repository::init(repository_path)?;
    let mut repository = Repository::open(repository_path)?;
    let error = backup::Engine::new(repository_path, &mut repository);
    assert!(error.is_err());
    Ok(())
}
// TODO: index corruption
// TODO: encryption
// TODO: resume from sleep while backup in progress