Session 13: Save Slot Preview (footer shows each slot's stardust, buildings, achievements, last-saved; hover to preview)

2026-08-23 17:10:56 +00:00
parent 1b9932391c
commit 40b85f5707
5 changed files with 176 additions and 0 deletions
@@ -637,6 +637,82 @@ const Game = {
        }
    },

+    /**
+     * Build a lightweight preview of a given save slot WITHOUT mutating the
+     * live game state. Returns an object describing what that slot holds:
+     *   - present: whether the slot has any saved data
+     *   - stardust: current (live) stardust production/sec for the slot
+     *   - totalStardust: lifetime stardust earned in the slot
+     *   - buildings: total number of buildings owned in the slot
+     *   - achievements: count/total of achievements unlocked in the slot
+     *   - prestigeCount: how many times the slot has been prestiged
+     *   - lastSaved: human-readable "time ago" string for the slot's save time
+     * An empty/unreadable slot returns present:false with zeroed fields.
+     */
+    getSlotPreview(slot) {
+        const data = this.loadSlot(slot);
+        if (!data) {
+            return {
+                present: false,
+                stardust: 0,
+                totalStardust: 0,
+                buildings: 0,
+                achievements: [0, 33],
+                prestigeCount: 0,
+                lastSaved: 'never'
+            };
+        }
+
+        const buildingCount = Object.values(data.buildings || {})
+            .reduce((sum, c) => sum + (Number(c) || 0), 0);
+
+        let timeAgo = 'never';
+        if (typeof data.lastSaveTime === 'number') {
+            const secs = Math.max(0, Math.floor((Date.now() - data.lastSaveTime) / 1000));
+            timeAgo = this.formatTimeAgo(secs);
+        }
+
+        return {
+            present: true,
+            stardust: Number(data.stardust) || 0,
+            totalStardust: Number(data.totalStardust) || 0,
+            buildings: buildingCount,
+            achievements: [
+                Array.isArray(data.achievements) ? data.achievements.length : 0,
+                33
+            ],
+            prestigeCount: Number(data.prestigeCount) || 0,
+            lastSaved: timeAgo
+        };
+    },
+
+    /**
+     * Format a number of seconds as a compact "time ago" string
+     * (e.g. "just now", "1m ago", "3h ago", "2d ago"). Used by slot previews.
+     */
+    formatTimeAgo(secs) {
+        if (secs < 5) return 'just now';
+
+        // Largest units first; each entry is [thresholdSeconds, label].
+        const buckets = [
+            [365 * 86400, 'y'],
+            [30 * 86400, 'mo'],
+            [86400, 'd'],
+            [3600, 'h'],
+            [60, 'm']
+        ];
+
+        for (const [threshold, label] of buckets) {
+            if (secs >= threshold) {
+                const value = Math.floor(secs / threshold);
+                return `${value}${label} ago`;
+            }
+        }
+
+        // Below one minute.
+        return `${Math.max(1, secs)}s ago`;
+    },
+
    /**
     * Switch the active save slot. Persists the selection and reloads that
     * slot's data from localStorage into the live game state, preserving