feat: shop system removed from talk system, added per-item restock and variable pricing

1 files changed, 64 insertions, 22 deletions

diff --git a/internal/behavior/store.go b/internal/behavior/store.go
index 38cc72b..8112e1c 100644
--- a/internal/behavior/store.go
+++ b/internal/behavior/store.go
@@ -126,7 +126,9 @@ func LoadDropTable(dataDir, id string) (*DropTableDef, error) {
 	return &dt, nil
 }
 
-func ResolveDrop(dataDir string, drops []DropEntry) *DropEntry {
+// pickWeighted returns a single entry chosen by weight, without resolving any
+// table reference on it. Returns nil if the list is empty or has no weight.
+func pickWeighted(drops []DropEntry) *DropEntry {
 	if len(drops) == 0 {
 		return nil
 	}
@@ -142,29 +144,69 @@ func ResolveDrop(dataDir string, drops []DropEntry) *DropEntry {
 	for i := range drops {
 		cumulative += drops[i].Weight
 		if roll < cumulative {
-			if drops[i].Table != "" {
-				sub, err := LoadDropTable(dataDir, drops[i].Table)
-				if err == nil {
-					if resolved := ResolveDrop(dataDir, sub.Drops); resolved != nil {
-						qty := drops[i].Quantity
-						if qty <= 0 {
-							qty = resolved.Quantity
-						}
-						if qty <= 0 {
-							qty = 1
-						}
-						return &DropEntry{
-							ItemID:         resolved.ItemID,
-							Quantity:       qty,
-							Depletes:       drops[i].Depletes,
-							SuccessMessage: drops[i].SuccessMessage,
-						}
-					}
-				}
-				return nil
-			}
 			return &drops[i]
 		}
 	}
 	return &drops[0]
 }
+
+func ResolveDrop(dataDir string, drops []DropEntry) *DropEntry {
+	picked := pickWeighted(drops)
+	if picked == nil {
+		return nil
+	}
+	if picked.Table != "" {
+		sub, err := LoadDropTable(dataDir, picked.Table)
+		if err != nil {
+			return nil
+		}
+		resolved := ResolveDrop(dataDir, sub.Drops)
+		if resolved == nil {
+			return nil
+		}
+		qty := picked.Quantity
+		if qty <= 0 {
+			qty = resolved.Quantity
+		}
+		if qty <= 0 {
+			qty = 1
+		}
+		return &DropEntry{
+			ItemID:         resolved.ItemID,
+			Quantity:       qty,
+			Depletes:       picked.Depletes,
+			SuccessMessage: picked.SuccessMessage,
+		}
+	}
+	return picked
+}
+
+// ResolveDropList performs one weighted pick from drops. A plain item entry
+// yields a single result. When the picked entry references a sub-table, its
+// Quantity is treated as the number of INDEPENDENT rolls against that sub-table
+// (default 1) — each roll may produce a different item — and all results are
+// returned. Tables are just weighted lists of items; this is skill-independent.
+func ResolveDropList(dataDir string, drops []DropEntry) []DropEntry {
+	picked := pickWeighted(drops)
+	if picked == nil {
+		return nil
+	}
+	if picked.Table == "" {
+		return []DropEntry{*picked}
+	}
+	sub, err := LoadDropTable(dataDir, picked.Table)
+	if err != nil {
+		return nil
+	}
+	rolls := picked.Quantity
+	if rolls <= 0 {
+		rolls = 1
+	}
+	var out []DropEntry
+	for i := 0; i < rolls; i++ {
+		if resolved := ResolveDrop(dataDir, sub.Drops); resolved != nil && resolved.ItemID != "" {
+			out = append(out, *resolved)
+		}
+	}
+	return out
+}