import path from "node:path";
import type { AppPersistenceConfig } from "../../presentation/config/AppConfig";

export class CodemationDatabaseUrlParser {
  parse(url: string, consumerRoot: string): AppPersistenceConfig {
    const trimmed = url.trim();
    if (trimmed.length === 0) {
      throw new Error("CODEMATION_DATABASE_URL is empty.");
    }
    if (trimmed.toLowerCase().startsWith("sqlite://")) {
      const remainder = trimmed.slice("sqlite://".length);
      const filePath = path.isAbsolute(remainder) ? remainder : path.resolve(consumerRoot, remainder);
      return { kind: "sqlite", databaseFilePath: filePath };
    }
    if (trimmed.toLowerCase().startsWith("pgsql://")) {
      return { kind: "postgresql", databaseUrl: `postgresql://${trimmed.slice("pgsql://".length)}` };
    }
    if (trimmed.toLowerCase().startsWith("postgresql://") || trimmed.toLowerCase().startsWith("postgres://")) {
      return { kind: "postgresql", databaseUrl: trimmed };
    }
    throw new Error(
      `Unsupported CODEMATION_DATABASE_URL scheme: "${trimmed}". ` +
        `Use sqlite://, pgsql://, postgresql://, or postgres://.`,
    );
  }
}