import path from "node:path"

// NOTE: This helper imports the generated Prisma client from TypeScript files.
// Run scripts that rely on it via a transpiling runner (e.g. `tsx` or Bun).
import { PrismaClient } from "../../src/generated/prisma/client.ts"
import { PrismaBetterSqlite3 } from "@prisma/adapter-better-sqlite3"

const PROJECT_ROOT = process.cwd()
const PRISMA_DIR = path.join(PROJECT_ROOT, "prisma")

function resolveFileUrl(url) {
  if (!url.startsWith("file:")) {
    return url
  }

  const filePath = url.slice("file:".length)

  if (filePath.startsWith("//")) {
    return url
  }

  if (path.isAbsolute(filePath)) {
    return `file:${path.normalize(filePath)}`
  }

  const normalized = path.normalize(filePath)
  const prismaPrefix = `prisma${path.sep}`
  const relativeToPrisma = normalized.startsWith(prismaPrefix)
    ? normalized.slice(prismaPrefix.length)
    : normalized

  const absolutePath = path.resolve(PRISMA_DIR, relativeToPrisma)

  if (!absolutePath.startsWith(PROJECT_ROOT)) {
    throw new Error(`DATABASE_URL path escapes project directory: ${filePath}`)
  }

  return `file:${absolutePath}`
}

function normalizeDatasourceUrl(envUrl) {
  const trimmed = envUrl?.trim()
  if (trimmed) {
    return resolveFileUrl(trimmed)
  }

  if (process.env.NODE_ENV === "production") {
    return "file:/app/data/db.sqlite"
  }

  return resolveFileUrl("file:./db.dev.sqlite")
}

export function createPrismaClient() {
  const resolvedDatabaseUrl = normalizeDatasourceUrl(process.env.DATABASE_URL)
  process.env.DATABASE_URL = resolvedDatabaseUrl

  const adapter = new PrismaBetterSqlite3({
    url: resolvedDatabaseUrl,
  })

  return new PrismaClient({ adapter })
}