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path: root/crates/yt/src/cache/mod.rs
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// yt - A fully featured command line YouTube client
//
// Copyright (C) 2024 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// Copyright (C) 2025 Benedikt Peetz <benedikt.peetz@b-peetz.de>
// SPDX-License-Identifier: GPL-3.0-or-later
//
// This file is part of Yt.
//
// You should have received a copy of the License along with this program.
// If not, see <https://www.gnu.org/licenses/gpl-3.0.txt>.

use anyhow::{Context, Result};
use log::{debug, info};
use tokio::fs;

use crate::{
    app::App,
    storage::video_database::{
        Video, VideoStatus, VideoStatusMarker, downloader::set_video_cache_path, get,
    },
};

async fn invalidate_video(app: &App, video: &Video, hard: bool) -> Result<()> {
    info!("Invalidating cache of video: '{}'", video.title);

    if hard {
        if let VideoStatus::Cached {
            cache_path: path, ..
        } = &video.status
        {
            info!("Removing cached video at: '{}'", path.display());
            if let Err(err) = fs::remove_file(path).await.map_err(|err| err.kind()) {
                match err {
                    std::io::ErrorKind::NotFound => {
                        // The path is already gone
                        debug!(
                            "Not actually removing path: '{}'. It is already gone.",
                            path.display()
                        );
                    }
                    err => Err(std::io::Error::from(err)).with_context(|| {
                        format!(
                            "Failed to delete video ('{}') cache path: '{}'.",
                            video.title,
                            path.display()
                        )
                    })?,
                }
            }
        }
    }

    set_video_cache_path(app, &video.extractor_hash, None).await?;

    Ok(())
}

pub async fn invalidate(app: &App, hard: bool) -> Result<()> {
    let all_cached_things = get::videos(app, &[VideoStatusMarker::Cached]).await?;

    info!("Got videos to invalidate: '{}'", all_cached_things.len());

    for video in all_cached_things {
        invalidate_video(app, &video, hard).await?;
    }

    Ok(())
}

/// # Panics
/// Only if internal assertions fail.
pub async fn maintain(app: &App, all: bool) -> Result<()> {
    let domain = if all {
        VideoStatusMarker::ALL.as_slice()
    } else {
        &[VideoStatusMarker::Watch, VideoStatusMarker::Cached]
    };

    let cached_videos = get::videos(app, domain).await?;

    let mut found_focused = 0;
    for vid in cached_videos {
        if let VideoStatus::Cached {
            cache_path: path,
            is_focused,
        } = &vid.status
        {
            info!("Checking if path ('{}') exists", path.display());
            if !path.exists() {
                invalidate_video(app, &vid, false).await?;
            }

            if *is_focused {
                found_focused += 1;
            }
        }
    }

    assert!(
        found_focused <= 1,
        "Only one video can be focused at a time"
    );

    Ok(())
}