import type { DatabaseType } from "@/types/database";
import { quoteTableIdentifier } from "./tableSelectSql";

const MYSQL_COMPATIBLE_PROFILES = new Set([
  "mysql",
  "mariadb",
  "tidb",
  "oceanbase",
  "doris",
  "starrocks",
  "custom_mysql",
]);
const MYSQL_COMPATIBLE_TYPES = new Set<DatabaseType>(["mysql", "doris", "starrocks", "goldendb"]);

export interface CreateDatabaseSqlOptions {
  databaseType?: DatabaseType;
  driverProfile?: string | null;
  name: string;
  charset?: string;
  collation?: string;
}

export function supportsCreateDatabaseCharset(databaseType?: DatabaseType, driverProfile?: string | null): boolean {
  return (
    MYSQL_COMPATIBLE_TYPES.has(databaseType as DatabaseType) ||
    (!!driverProfile && MYSQL_COMPATIBLE_PROFILES.has(driverProfile))
  );
}

export function buildCreateDatabaseSql(options: CreateDatabaseSqlOptions): string {
  const name = quoteTableIdentifier(options.databaseType, options.name);
  const charset = cleanSqlOption(options.charset);
  const collation = cleanSqlOption(options.collation);
  if (!supportsCreateDatabaseCharset(options.databaseType, options.driverProfile) || !charset) {
    return `CREATE DATABASE ${name};`;
  }
  const collateClause = collation ? ` COLLATE ${collation}` : "";
  return `CREATE DATABASE ${name} CHARACTER SET ${charset}${collateClause};`;
}

export function buildDuckDbAttachDatabaseSql(path: string, name: string): string {
  return `ATTACH ${quoteSqlString(path)} AS ${quoteTableIdentifier("duckdb", name)};`;
}

export function duckDbAttachedDatabaseNameFromPath(path: string): string {
  const fileName = path.split(/[\\/]/).pop() ?? "";
  const withoutExtension = fileName.replace(/\.[^.\\/]+$/, "");
  const normalized = withoutExtension
    .trim()
    .replace(/[^\p{L}\p{N}_]+/gu, "_")
    .replace(/^_+|_+$/g, "");
  return normalized || "duckdb_database";
}

export function uniqueDuckDbAttachedDatabaseName(baseName: string, existingNames: string[]): string {
  const existing = new Set(existingNames.map((name) => name.toLowerCase()));
  if (!existing.has(baseName.toLowerCase())) return baseName;
  for (let index = 2; index < Number.MAX_SAFE_INTEGER; index++) {
    const candidate = `${baseName}_${index}`;
    if (!existing.has(candidate.toLowerCase())) return candidate;
  }
  return `${baseName}_${Date.now()}`;
}

function cleanSqlOption(value: string | undefined): string {
  return value?.trim().replace(/[;\s]+/g, "") ?? "";
}

function quoteSqlString(value: string): string {
  return `'${value.replace(/'/g, "''")}'`;
}