feat(backend): add mod management API endpoints

backend/internal/api/mods.go

@@ -0,0 +1,89 @@
+package api
+
+import (
+	"net/http"
+
+	"arma3-web-server/internal/services"
+
+	"github.com/gin-gonic/gin"
+)
+
+type deleteModInput struct {
+	Path string `json:"path" binding:"required"`
+}
+
+func (h *Handler) ListMods(c *gin.Context) {
+	workshopMods := services.ListWorkshopMods(h.serverfileDir)
+	localMods := services.ListLocalMods(h.modsDir)
+
+	usedWorkshop, usedLocal := services.BuildUsageMap(h.modlists)
+
+	for i := range workshopMods {
+		if lists, ok := usedWorkshop[workshopMods[i].ID]; ok {
+			workshopMods[i].InUse = true
+			workshopMods[i].Modlists = lists
+			// pull name from first modlist that has it
+			if workshopMods[i].Name == "" {
+				workshopMods[i].Name = lists[0]
+			}
+		}
+	}
+
+	for i := range localMods {
+		// check both the display name and the @name
+		if lists, ok := usedLocal[localMods[i].ID]; ok {
+			localMods[i].InUse = true
+			localMods[i].Modlists = lists
+		} else if lists, ok := usedLocal[localMods[i].Name]; ok {
+			localMods[i].InUse = true
+			localMods[i].Modlists = lists
+		}
+	}
+
+	all := append(workshopMods, localMods...)
+	if all == nil {
+		all = []services.ModInfo{}
+	}
+	c.JSON(http.StatusOK, all)
+}
+
+func (h *Handler) DeleteMod(c *gin.Context) {
+	var input deleteModInput
+	if err := c.ShouldBindJSON(&input); err != nil {
+		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
+		return
+	}
+
+	if err := services.RemoveMod(input.Path); err != nil {
+		c.JSON(http.StatusInternalServerError, gin.H{"error": err.Error()})
+		return
+	}
+	c.JSON(http.StatusNoContent, nil)
+}
+
+func (h *Handler) CleanupMods(c *gin.Context) {
+	workshopMods := services.ListWorkshopMods(h.serverfileDir)
+	localMods := services.ListLocalMods(h.modsDir)
+
+	usedWorkshop, usedLocal := services.BuildUsageMap(h.modlists)
+
+	var deleted int
+	for _, m := range workshopMods {
+		if _, ok := usedWorkshop[m.ID]; !ok {
+			if err := services.RemoveMod(m.Path); err == nil {
+				deleted++
+			}
+		}
+	}
+	for _, m := range localMods {
+		if _, ok := usedLocal[m.ID]; !ok {
+			if _, ok2 := usedLocal[m.Name]; !ok2 {
+				if err := services.RemoveMod(m.Path); err == nil {
+					deleted++
+				}
+			}
+		}
+	}
+
+	c.JSON(http.StatusOK, gin.H{"deleted": deleted})
+}