/**
 * Patch: prevent [object Object] in content textarea.
 *
 * content-field.njk falls back to `fieldData("content").value` when
 * `properties.content.text` is null. fieldData returns the raw content
 * property which is an object `{ html: null, text: null }`. Nunjucks
 * coerces that to "[object Object]" in the textarea value.
 *
 * Fix: extract .text from the fieldData value when it's an object,
 * but preserve a plain string value for validation-error re-renders.
 */
import { access, readFile, writeFile } from "node:fs/promises";

const candidates = [
  "node_modules/@rmdes/indiekit-endpoint-posts/includes/post-types/content-field.njk",
  "node_modules/@indiekit/endpoint-posts/includes/post-types/content-field.njk",
];

const marker = "[patch] content-field-object";
const oldSnippet = `{{ textarea({
  name: "content",
  value: properties.content.text or fieldData("content").value,`;
const newSnippet = `{#- ${marker} -#}
{%- set _contentFv = fieldData("content").value -%}
{{ textarea({
  name: "content",
  value: properties.content.text or _contentFv.text or (_contentFv if _contentFv is string else ""),`;

async function exists(p) {
  try { await access(p); return true; } catch { return false; }
}

let patched = 0;
for (const filePath of candidates) {
  if (!(await exists(filePath))) continue;
  const source = await readFile(filePath, "utf8");
  if (source.includes(marker)) { console.log(`[postinstall] content-field-object already applied: ${filePath}`); continue; }
  if (!source.includes(oldSnippet)) { console.log(`[postinstall] content-field-object: snippet not found in ${filePath}`); continue; }
  await writeFile(filePath, source.replace(oldSnippet, newSnippet), "utf8");
  patched++;
}

console.log(patched > 0
  ? `[postinstall] Patched content-field-object in ${patched} file(s)`
  : "[postinstall] content-field-object: nothing to patch");