Improve disk UI and build performance

internal/api/handlers_copy.go

@@ -2,8 +2,12 @@ package api
 
 import (
 	"context"
+	"encoding/json"
+	"errors"
+	"io"
 	"net/http"
 
+	"jukebox_maker/internal/config"
 	"jukebox_maker/internal/copier"
 	"jukebox_maker/internal/disk"
 )
@@ -12,19 +16,47 @@ func (s *Server) handleCopyStart(w http.ResponseWriter, r *http.Request) {
 	diskID := r.PathValue("diskID")
 	diskInfo, ok := s.deps.Watcher.DiskByID(diskID)
 	if !ok || diskInfo.State != disk.DiskKnown {
-		jsonErr(w, http.StatusUnprocessableEntity, "no known disk connected")
+		jsonErr(w, http.StatusUnprocessableEntity, "no initialized disk connected")
 		return
 	}
 
 	cfg := s.deps.Config
-	var enabledSources []string
+	hasEnabledSources := false
 	for _, src := range cfg.Sources {
 		if src.Enabled {
-			enabledSources = append(enabledSources, src.Path)
+			hasEnabledSources = true
+			break
 		}
 	}
-	if len(enabledSources) == 0 {
-		jsonErr(w, http.StatusUnprocessableEntity, "no sources enabled")
+	if !hasEnabledSources {
+		jsonErr(w, http.StatusUnprocessableEntity, "no source folders selected")
+		return
+	}
+
+	var req struct {
+		Mode string `json:"mode"`
+	}
+	if r.Body != nil {
+		if err := json.NewDecoder(r.Body).Decode(&req); err != nil && !errors.Is(err, io.EOF) {
+			jsonErr(w, http.StatusBadRequest, "invalid JSON: "+err.Error())
+			return
+		}
+	}
+
+	overwriteMode := cfg.OverwriteMode
+	switch req.Mode {
+	case "", "add":
+		overwriteMode = config.OverwriteSkip
+	case "replace":
+		overwriteMode = config.OverwriteDelete
+	default:
+		jsonErr(w, http.StatusBadRequest, "invalid copy mode")
+		return
+	}
+
+	reserveBytes := int64(cfg.ReserveFreeGB * 1e9)
+	if diskInfo.FreeBytes <= reserveBytes {
+		jsonErr(w, http.StatusUnprocessableEntity, "free space is below reserve threshold")
 		return
 	}
 
@@ -33,9 +65,9 @@ func (s *Server) handleCopyStart(w http.ResponseWriter, r *http.Request) {
 		MountPath:      diskInfo.MountPath,
 		MediaPath:      s.deps.MediaPath,
 		DestFolder:     cfg.DestFolder,
-		EnabledSources: enabledSources,
+		SourceRules:    cfg.Sources,
 		ReserveFreeGB:  cfg.ReserveFreeGB,
-		OverwriteMode:  cfg.OverwriteMode,
+		OverwriteMode:  overwriteMode,
 		FileSelectMode: cfg.FileSelectMode,
 	}