package de.opcua.app.model;

import com.fasterxml.jackson.annotation.JsonIgnoreProperties;
import java.util.List;

/**
 * Ein Knoten im OPC UA JSON-Export.
 * Felder entsprechen dem opcua-export.json Format.
 * referenceTypeId ist optional (z.B. "i=35", "i=46", "i=47").
 */
@JsonIgnoreProperties(ignoreUnknown = true)
public class ExportNode {

    public String           name;
    public String           id;
    public String           browseName;
    public String           nodeClass;
    public String           dataType;
    public String           accessLevel;
    public String           value;
    public String           nodeId;           // Feld im opcua-export Format
    public String           displayName;      // Feld im opcua-export Format
    public String           referenceType;    // z.B. "Organizes", "HasProperty", "HasComponent"
    public String           referenceTypeId;  // z.B. "i=35" (Organizes), "i=46" (HasProperty), "i=47" (HasComponent)
    public Boolean          containsNoLoops;  // OPC UA View-Attribut (null = unbekannt)
    public Long             viewVersion;      // OPC UA View-Attribut UInt32 (null = unbekannt)
    public List<ExportNode> children;

    /** Effektiver Anzeigename: displayName > name > browseName. */
    public String effectiveName() {
        if (displayName != null && !displayName.isBlank()) return displayName;
        if (name        != null && !name.isBlank())        return name;
        if (browseName  != null && !browseName.isBlank())  return browseName;
        return "Node";
    }

    /** Effektive NodeId: nodeId > id. */
    public String effectiveNodeId() {
        if (nodeId != null && !nodeId.isBlank()) return nodeId;
        return id;
    }

    public String effectiveDataType() { return dataType; }

    public boolean isVariable() {
        if (nodeClass != null)
            return "Variable".equals(nodeClass) || "VariableType".equals(nodeClass);
        return value != null || dataType != null;
    }

    private static String referenceTypeToId(String ref) {
        if (ref == null || ref.isBlank()) return null;
        return switch (ref) {
            case "Organizes" -> "i=35";
            case "HasTypeDefinition" -> "i=40";
            case "HasSubtype" -> "i=45";
            case "HasProperty" -> "i=46";
            case "HasComponent" -> "i=47";
            case "HasNotifier" -> "i=48";
            default -> ref;
        };
    }

    /** Konvertiert zu TreeNodeRef für GUI. */
    public TreeNodeRef toTreeNodeRef() {
        // 9-Arg-Konstruktor: alle Felder inkl. View-Attribute
        return new TreeNodeRef(
            effectiveName(),
            effectiveNodeId(),
            browseName != null ? browseName : effectiveName(),
            nodeClass  != null ? nodeClass  : (isVariable() ? "Variable" : "Object"),
            dataType,
            accessLevel != null ? accessLevel : "ReadWrite",
            referenceTypeId != null ? referenceTypeId : referenceTypeToId(referenceType),
            containsNoLoops != null ? containsNoLoops : true,       // Default: true (sicher)
            viewVersion     != null ? viewVersion     : 0L          // Default: 0 (unversioniert)
        );
    }

    /** Konvertiert TreeNodeRef-Daten zurück in ExportNode. */
    public static ExportNode fromTreeNodeRef(TreeNodeRef ref) {
        ExportNode en = new ExportNode();
        en.name            = ref.displayName();
        en.id              = ref.nodeId();
        en.nodeId          = ref.nodeId();
        en.displayName     = ref.displayName();
        en.browseName      = ref.browseName();
        en.nodeClass       = ref.nodeClass();
        en.dataType        = ref.dataType();
        en.accessLevel     = ref.accessLevel();
        en.referenceTypeId = ref.referenceTypeId();
        en.referenceType   = ref.referenceTypeId() != null ? TreeNodeRef.resolveRefTypeId(ref.referenceTypeId()) : null;
        en.containsNoLoops = ref.containsNoLoops();
        en.viewVersion     = ref.viewVersion();
        return en;
    }
}