/**
 * Patch: fix store-github HTTP methods for Gitea's Contents API.
 *
 * GitHub API:  PUT /contents/{path}  = create-or-update (sha optional)
 * Gitea API:   POST /contents/{path} = create (no sha)
 *              PUT  /contents/{path} = update (sha required → 422 without it)
 *
 * Two changes:
 * 1. createFile: use POST instead of PUT.
 * 2. updateFile: when sha is undefined (file didn't exist), bail out to
 *    createFile() instead of falling through to PUT-without-SHA which 422s.
 *    Also restores plain `sha` in the PUT body (no longer need the spread
 *    guard from patch-store-github-update-fallback since we bail early).
 */

import { readFile, writeFile, access } from "node:fs/promises";

const TARGET = "node_modules/@indiekit/store-github/index.js";
const MARKER = "// [patch] store-github-gitea-methods";

// ── Change 1: createFile uses POST ──────────────────────────────────────────

const OLD_CREATE_PUT = `      createResponse = await this.#client(filePath, "PUT", {`;
const NEW_CREATE_POST = `      createResponse = await this.#client(filePath, "POST", { ${MARKER}`;

// ── Change 2: updateFile bails to createFile when sha is undefined ───────────
// Targets the block that starts after sha is resolved (by patch-store-github-update-fallback).
// Replaces the spread-sha guard with an early-return to createFile.

const OLD_UPDATE_SPREAD = `    const updateFilePath = newPath || filePath;

    let updateResponse;
    try {
      debug(\`Try updating file \${filePath} in repo \${repo}, branch \${branch}\`);
      updateResponse = await this.#client(updateFilePath, "PUT", {
        branch,
        content: Buffer.from(content).toString("base64"),
        message,
        ...(sha ? { sha } : {}), // [patch] store-github-update-fallback`;

const NEW_UPDATE_SPREAD = `    if (!sha) { ${MARKER}
      // File didn't exist — create it via POST instead of PUT-without-SHA (422 on Gitea)
      return this.createFile(filePath, content, { message });
    }

    const updateFilePath = newPath || filePath;

    let updateResponse;
    try {
      debug(\`Try updating file \${filePath} in repo \${repo}, branch \${branch}\`);
      updateResponse = await this.#client(updateFilePath, "PUT", {
        branch,
        content: Buffer.from(content).toString("base64"),
        message,
        sha, ${MARKER}`;

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

if (!(await exists(TARGET))) {
  console.log(`[postinstall] store-github-gitea-methods: target not found, skipping`);
  process.exit(0);
}

const source = await readFile(TARGET, "utf8");

if (source.includes(MARKER)) {
  console.log("[postinstall] store-github-gitea-methods: already patched");
  process.exit(0);
}

let updated = source;
let patched = 0;

if (!updated.includes(OLD_CREATE_PUT)) {
  console.warn("[postinstall] store-github-gitea-methods: createFile PUT snippet not found — skipping change 1");
} else {
  updated = updated.replace(OLD_CREATE_PUT, NEW_CREATE_POST);
  patched++;
}

if (!updated.includes(OLD_UPDATE_SPREAD)) {
  console.warn("[postinstall] store-github-gitea-methods: updateFile spread snippet not found — skipping change 2");
} else {
  updated = updated.replace(OLD_UPDATE_SPREAD, NEW_UPDATE_SPREAD);
  patched++;
}

if (patched === 0) {
  console.warn("[postinstall] store-github-gitea-methods: no changes applied");
  process.exit(0);
}

await writeFile(TARGET, updated, "utf8");
console.log(`[postinstall] store-github-gitea-methods: patched ${patched}/2 change(s) in ${TARGET}`);