import { join, relative } from "@std/path";
import { ensureDir } from "@std/fs/ensure-dir";
import { walk } from "@std/fs/walk";

export type DeployOptions = {
  srcDir: string;
  destParentDir: string;
  /** Final folder name under destParentDir (defaults to basename of srcDir) */
  folderName?: string;
  dryRun: boolean;
};

export async function deployCampaignFolder(
  options: DeployOptions,
): Promise<{ destDir: string; files: number }> {
  const src = options.srcDir.replace(/\/+$/, "");
  const baseName = options.folderName ?? src.split("/").pop() ?? "campaign";
  const destDir = join(options.destParentDir, baseName);
  let count = 0;

  if (options.dryRun) {
    for await (
      const entry of walk(src, { includeFiles: true, includeDirs: false })
    ) {
      if (entry.isFile) count++;
    }
    return { destDir, files: count };
  }

  await ensureDir(options.destParentDir);

  for await (
    const entry of walk(src, { includeFiles: true, includeDirs: false })
  ) {
    if (!entry.isFile) continue;
    const rel = relative(src, entry.path);
    const target = join(destDir, rel);
    await ensureDir(join(target, ".."));
    await Deno.copyFile(entry.path, target);
    count++;
  }

  return { destDir, files: count };
}