import { PrismaClient } from "@prisma/client";
import { PrismaBetterSqlite3 } from "@prisma/adapter-better-sqlite3";
import { PrismaLibSql } from "@prisma/adapter-libsql";

// Prisma 7 requires a driver adapter for SQLite connections.
// Uses Turso (cloud SQLite) when TURSO_DATABASE_URL is set, otherwise local file.
function createPrisma() {
  if (process.env.TURSO_DATABASE_URL) {
    const url = process.env.TURSO_DATABASE_URL.replace(/^libsql:\/\//, "https://");
    const adapter = new PrismaLibSql({ url, authToken: process.env.TURSO_AUTH_TOKEN });
    return new PrismaClient({ adapter } as ConstructorParameters<typeof PrismaClient>[0]);
  }

  const url = process.env.DATABASE_URL || "file:./leadflow.db";
  const adapter = new PrismaBetterSqlite3({ url });
  return new PrismaClient({ adapter } as ConstructorParameters<typeof PrismaClient>[0]);
}

const globalForPrisma = globalThis as unknown as {
  prisma: PrismaClient | undefined;
};

export const prisma = globalForPrisma.prisma ?? createPrisma();

if (process.env.NODE_ENV !== "production") globalForPrisma.prisma = prisma;