feat(engine): add weekly goals with ISO-week rollover and +75 XP bonus

Phase 6 part 2b:
- solitaire_data::weekly defines WeeklyGoalKind, WeeklyGoalDef,
  WeeklyGoalContext, current_iso_week_key, and three starter goals
  (5 wins, 3 no-undo wins, 3 fast wins).
- PlayerProgress gains weekly_goal_week_iso, roll_weekly_goals_if_new_week,
  and record_weekly_progress (returns true exactly once per goal completion).
- WeeklyGoalsPlugin evaluates GameWonEvent against WEEKLY_GOALS, rolls the
  week if needed, increments matching counters, awards WEEKLY_GOAL_XP for
  newly-completed goals, persists progress, and fires
  WeeklyGoalCompletedEvent.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

solitaire_engine/src/weekly_goals_plugin.rs

@@ -0,0 +1,211 @@
+//! Tracks per-ISO-week goal progress: rolls the counter set when the week
+//! changes, increments matching goals on `GameWonEvent`, awards
+//! `WEEKLY_GOAL_XP` when a goal completes, and persists.
+
+use bevy::prelude::*;
+use chrono::Local;
+use solitaire_data::{
+    current_iso_week_key, save_progress_to, weekly_goal_by_id, WeeklyGoalContext, WEEKLY_GOALS,
+    WEEKLY_GOAL_XP,
+};
+
+use crate::events::GameWonEvent;
+use crate::game_plugin::GameMutation;
+use crate::progress_plugin::{ProgressResource, ProgressStoragePath, ProgressUpdate};
+use crate::resources::GameStateResource;
+
+/// Fired when the player has just completed a weekly goal.
+#[derive(Event, Debug, Clone)]
+pub struct WeeklyGoalCompletedEvent {
+    pub goal_id: String,
+    pub description: String,
+}
+
+pub struct WeeklyGoalsPlugin;
+
+impl Plugin for WeeklyGoalsPlugin {
+    fn build(&self, app: &mut App) {
+        app.add_event::<WeeklyGoalCompletedEvent>()
+            .add_event::<GameWonEvent>()
+            // Run after GameMutation (so GameWonEvent is available) and
+            // ProgressUpdate (so we don't fight ProgressPlugin's add_xp).
+            .add_systems(
+                Update,
+                evaluate_weekly_goals
+                    .after(GameMutation)
+                    .after(ProgressUpdate),
+            );
+    }
+}
+
+fn evaluate_weekly_goals(
+    mut wins: EventReader<GameWonEvent>,
+    game: Res<GameStateResource>,
+    mut progress: ResMut<ProgressResource>,
+    path: Res<ProgressStoragePath>,
+    mut completions: EventWriter<WeeklyGoalCompletedEvent>,
+) {
+    let mut events: Vec<&GameWonEvent> = wins.read().collect();
+    if events.is_empty() {
+        return;
+    }
+    // Roll the week first so progress for old weeks doesn't carry over.
+    let week_key = current_iso_week_key(Local::now().date_naive());
+    progress.0.roll_weekly_goals_if_new_week(&week_key);
+
+    let mut any_change = false;
+    let mut bonus_xp: u64 = 0;
+
+    // Drain in order so earlier wins roll up before later ones are evaluated
+    // (only matters for backlogged events; usually 1 per frame).
+    for ev in events.drain(..) {
+        let ctx = WeeklyGoalContext {
+            time_seconds: ev.time_seconds,
+            used_undo: game.0.undo_count > 0,
+        };
+        for def in WEEKLY_GOALS {
+            if !def.matches(&ctx) {
+                continue;
+            }
+            let just_completed = progress.0.record_weekly_progress(def.id, def.target);
+            any_change = true;
+            if just_completed {
+                bonus_xp = bonus_xp.saturating_add(WEEKLY_GOAL_XP);
+                completions.send(WeeklyGoalCompletedEvent {
+                    goal_id: def.id.to_string(),
+                    description: def.description.to_string(),
+                });
+            }
+        }
+    }
+
+    if bonus_xp > 0 {
+        progress.0.add_xp(bonus_xp);
+    }
+
+    if any_change {
+        if let Some(target) = &path.0 {
+            if let Err(e) = save_progress_to(target, &progress.0) {
+                warn!("failed to save progress after weekly goal update: {e}");
+            }
+        }
+    }
+}
+
+/// Resolve a goal id to its description (used for toasts).
+pub fn weekly_goal_description(id: &str) -> String {
+    weekly_goal_by_id(id)
+        .map(|g| g.description.to_string())
+        .unwrap_or_else(|| id.to_string())
+}
+
+#[cfg(test)]
+mod tests {
+    use super::*;
+    use crate::game_plugin::GamePlugin;
+    use crate::progress_plugin::ProgressPlugin;
+    use crate::table_plugin::TablePlugin;
+
+    fn headless_app() -> App {
+        let mut app = App::new();
+        app.add_plugins(MinimalPlugins)
+            .add_plugins(GamePlugin)
+            .add_plugins(TablePlugin)
+            .add_plugins(ProgressPlugin::headless())
+            .add_plugins(WeeklyGoalsPlugin);
+        app.update();
+        app
+    }
+
+    #[test]
+    fn first_win_increments_win_game_goal() {
+        let mut app = headless_app();
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+        let p = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(p.weekly_goal_progress.get("weekly_5_wins"), Some(&1));
+        // No-undo + slow win → no_undo goal also ticked, fast goal NOT ticked.
+        assert_eq!(p.weekly_goal_progress.get("weekly_3_no_undo"), Some(&1));
+        assert!(p.weekly_goal_progress.get("weekly_3_fast").is_none());
+    }
+
+    #[test]
+    fn fast_win_ticks_fast_goal_too() {
+        let mut app = headless_app();
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 60,
+        });
+        app.update();
+        let p = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(p.weekly_goal_progress.get("weekly_3_fast"), Some(&1));
+    }
+
+    #[test]
+    fn win_after_undo_does_not_tick_no_undo_goal() {
+        let mut app = headless_app();
+        app.world_mut()
+            .resource_mut::<GameStateResource>()
+            .0
+            .undo_count = 1;
+
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 200,
+        });
+        app.update();
+        let p = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(p.weekly_goal_progress.get("weekly_5_wins"), Some(&1));
+        assert!(p.weekly_goal_progress.get("weekly_3_no_undo").is_none());
+    }
+
+    #[test]
+    fn completing_a_goal_fires_event_and_awards_bonus() {
+        let mut app = headless_app();
+        // Pre-set the weekly_3_fast goal to 2/3 so the next fast win completes it.
+        app.world_mut()
+            .resource_mut::<ProgressResource>()
+            .0
+            .weekly_goal_progress
+            .insert("weekly_3_fast".to_string(), 2);
+        // Match the current ISO week key so roll_weekly_goals doesn't clear it.
+        let key = current_iso_week_key(Local::now().date_naive());
+        app.world_mut()
+            .resource_mut::<ProgressResource>()
+            .0
+            .weekly_goal_week_iso = Some(key);
+
+        let xp_before = app.world().resource::<ProgressResource>().0.total_xp;
+
+        app.world_mut().send_event(GameWonEvent {
+            score: 500,
+            time_seconds: 60,
+        });
+        app.update();
+
+        let p = &app.world().resource::<ProgressResource>().0;
+        assert_eq!(p.weekly_goal_progress.get("weekly_3_fast"), Some(&3));
+        // Delta = base win XP (from ProgressPlugin in the headless app) +
+        // WEEKLY_GOAL_XP for completing the goal. Verify the goal bonus is
+        // included by checking `delta - base_win_xp == WEEKLY_GOAL_XP`.
+        let base_win_xp = solitaire_data::xp_for_win(60, false);
+        assert_eq!(p.total_xp - xp_before, base_win_xp + WEEKLY_GOAL_XP);
+
+        let events = app.world().resource::<Events<WeeklyGoalCompletedEvent>>();
+        let mut cursor = events.get_cursor();
+        let fired: Vec<_> = cursor.read(events).cloned().collect();
+        assert!(fired.iter().any(|e| e.goal_id == "weekly_3_fast"));
+    }
+
+    #[test]
+    fn weekly_goal_description_resolves_known_and_unknown() {
+        assert_eq!(
+            weekly_goal_description("weekly_5_wins"),
+            "Win 5 games this week"
+        );
+        assert_eq!(weekly_goal_description("nope"), "nope");
+    }
+}