import type { ConnectionConfig, DatabaseInfo, TreeNode } from "@/types/database";
import { DEFAULT_DATABASE_TREE_LABEL } from "./treeNodeContext";

export function shouldIncludeDefaultDatabaseNode(
  connection: Pick<ConnectionConfig, "db_type"> | undefined,
  databases: DatabaseInfo[],
): boolean {
  return connection?.db_type === "mysql" && databases.some((database) => !database.name.trim());
}

export function buildDatabaseTreeNodes(
  connectionId: string,
  databases: DatabaseInfo[],
  options: { includeDefaultWhenEmpty?: boolean } = {},
): TreeNode[] {
  const nodes = databases.flatMap((db) => {
    const name = db.name.trim();
    if (!name) return [];
    return [
      {
        id: `${connectionId}:${name}`,
        label: name,
        type: "database" as const,
        connectionId,
        database: name,
        isExpanded: false,
        children: [],
      },
    ];
  });

  if (nodes.length > 0 || !options.includeDefaultWhenEmpty) return nodes;

  return [
    {
      id: `${connectionId}:`,
      label: DEFAULT_DATABASE_TREE_LABEL,
      type: "database" as const,
      connectionId,
      database: "",
      isExpanded: false,
      children: [],
    },
  ];
}

export function buildDuckDbConnectionTreeNodes(
  connectionId: string,
  databases: DatabaseInfo[],
  primarySchemas: string[],
): TreeNode[] {
  const schemaNodes = primarySchemas.flatMap((schema) => {
    const name = schema.trim();
    if (!name) return [];
    return [
      {
        id: `${connectionId}:main:${name}`,
        label: name,
        type: "schema" as const,
        connectionId,
        database: "main",
        schema: name,
        isExpanded: false,
        children: [],
      },
    ];
  });

  const attachedCatalogNodes = databases.flatMap((db) => {
    const name = db.name.trim();
    if (!name || name === "main") return [];
    return [
      {
        id: `${connectionId}:${name}`,
        label: name,
        type: "database" as const,
        connectionId,
        database: name,
        isExpanded: false,
        children: [],
      },
    ];
  });

  return [...schemaNodes, ...attachedCatalogNodes];
}