1 files changed, 143 insertions, 0 deletions
diff --git a/logic/src/home.rs b/logic/src/home.rs
new file mode 100644
index 0000000..f03173e
--- /dev/null
+++ b/logic/src/home.rs
@@ -0,0 +1,143 @@
+/*
+    This file is part of jellything (https://codeberg.org/metamuffin/jellything)
+    which is licensed under the GNU Affero General Public License (version 3); see /COPYING.
+    Copyright (C) 2025 metamuffin <metamuffin.org>
+*/
+
+use anyhow::{Context, Result};
+use jellybase::database::Database;
+use jellycommon::{
+    NodeID, NodeKind, Rating, Visibility,
+    api::ApiHomeResponse,
+    chrono::{Datelike, Utc},
+    user::WatchedState,
+};
+
+pub fn home(db: Database) -> Result<ApiHomeResponse> {
+    let mut items = db.list_nodes_with_udata(&sess.user.name)?;
+
+    let mut toplevel = db
+        .get_node_children(NodeID::from_slug("library"))
+        .context("root node missing")?
+        .into_iter()
+        .map(|n| db.get_node_with_userdata(n, &sess))
+        .collect::<anyhow::Result<Vec<_>>>()?;
+    toplevel.sort_by_key(|(n, _)| n.index.unwrap_or(usize::MAX));
+
+    let mut categories = Vec::<(String, Vec<_>)>::new();
+
+    categories.push((
+        "home.bin.continue_watching".to_string(),
+        items
+            .iter()
+            .filter(|(_, u)| matches!(u.watched, WatchedState::Progress(_)))
+            .cloned()
+            .collect(),
+    ));
+    categories.push((
+        "home.bin.watchlist".to_string(),
+        items
+            .iter()
+            .filter(|(_, u)| matches!(u.watched, WatchedState::Pending))
+            .cloned()
+            .collect(),
+    ));
+
+    items.retain(|(n, _)| matches!(n.visibility, Visibility::Visible));
+
+    items.sort_by_key(|(n, _)| n.release_date.map(|d| -d).unwrap_or(i64::MAX));
+
+    categories.push((
+        "home.bin.latest_video".to_string(),
+        items
+            .iter()
+            .filter(|(n, _)| matches!(n.kind, NodeKind::Video))
+            .take(16)
+            .cloned()
+            .collect(),
+    ));
+    categories.push((
+        "home.bin.latest_music".to_string(),
+        items
+            .iter()
+            .filter(|(n, _)| matches!(n.kind, NodeKind::Music))
+            .take(16)
+            .cloned()
+            .collect(),
+    ));
+    categories.push((
+        "home.bin.latest_short_form".to_string(),
+        items
+            .iter()
+            .filter(|(n, _)| matches!(n.kind, NodeKind::ShortFormVideo))
+            .take(16)
+            .cloned()
+            .collect(),
+    ));
+
+    items.sort_by_key(|(n, _)| {
+        n.ratings
+            .get(&Rating::Tmdb)
+            .map(|x| (*x * -1000.) as i32)
+            .unwrap_or(0)
+    });
+
+    categories.push((
+        "home.bin.max_rating".to_string(),
+        items
+            .iter()
+            .take(16)
+            .filter(|(n, _)| n.ratings.contains_key(&Rating::Tmdb))
+            .cloned()
+            .collect(),
+    ));
+
+    items.retain(|(n, _)| {
+        matches!(
+            n.kind,
+            NodeKind::Video | NodeKind::Movie | NodeKind::Episode | NodeKind::Music
+        )
+    });
+
+    categories.push((
+        "home.bin.daily_random".to_string(),
+        (0..16)
+            .flat_map(|i| Some(items[cheap_daily_random(i).checked_rem(items.len())?].clone()))
+            .collect(),
+    ));
+
+    {
+        let mut items = items.clone();
+        items.retain(|(_, u)| matches!(u.watched, WatchedState::Watched));
+        categories.push((
+            "home.bin.watch_again".to_string(),
+            (0..16)
+                .flat_map(|i| Some(items[cheap_daily_random(i).checked_rem(items.len())?].clone()))
+                .collect(),
+        ));
+    }
+
+    items.retain(|(n, _)| matches!(n.kind, NodeKind::Music));
+    categories.push((
+        "home.bin.daily_random_music".to_string(),
+        (0..16)
+            .flat_map(|i| Some(items[cheap_daily_random(i).checked_rem(items.len())?].clone()))
+            .collect(),
+    ));
+
+    Ok(ApiHomeResponse {
+        toplevel,
+        categories,
+    })
+}
+
+fn cheap_daily_random(i: usize) -> usize {
+    xorshift(xorshift(Utc::now().num_days_from_ce() as u64) + i as u64) as usize
+}
+
+fn xorshift(mut x: u64) -> u64 {
+    x ^= x << 13;
+    x ^= x >> 7;
+    x ^= x << 17;
+    x
+}