#!/usr/bin/env node
/**
 * pb_migration_shareholder_change.mjs
 *
 * ONE-OFF, IDEMPOTENT schema migration that adds the storage the
 * "5 - Change in shareholders" section needs.
 *
 * ---------------------------------------------------------------------------
 * WHY A MIGRATION INSTEAD OF RUNTIME ADMIN CALLS
 * ---------------------------------------------------------------------------
 * Editing a PocketBase collection schema requires superuser rights. Doing that
 * from a request handler would ship admin credentials into the hot path and
 * demand superuser auth on every deploy. This script applies the change ONCE,
 * ahead of time; the running app then uses only ordinary record-level APIs
 * (which lib/pb.ts already self-heals with PB_ADMIN_*).
 *
 * Re-running is safe: every step checks for the field/option first and skips it
 * if already present. Run it as often as you like.
 *
 * ---------------------------------------------------------------------------
 * WHAT IT CHANGES (all additive - no existing field, row or option is modified
 * or removed)
 * ---------------------------------------------------------------------------
 *   ysterbaard_resolutions          + kind    select
 *                                       director_change      (default)
 *                                       shareholder_change
 *
 *   ysterbaard_resolution_attendees + shares  number (integer, optional)
 *                                   + director_role gains two options:
 *                                       transferor  (seller of shares)
 *                                       transferee  (buyer of shares)
 *
 * Existing resolutions default to kind='director_change', so section 4 keeps
 * behaving exactly as before.
 *
 * ---------------------------------------------------------------------------
 * USAGE
 * ---------------------------------------------------------------------------
 *   node scripts/pb_migration_shareholder_change.mjs           # apply
 *   node scripts/pb_migration_shareholder_change.mjs --check   # report only
 *
 * Credentials come from .env.local (PB_URL, PB_ADMIN_EMAIL, PB_ADMIN_PASSWORD).
 */

import { readFileSync } from "node:fs";
import * as path from "node:path";
import { fileURLToPath } from "node:url";

const HERE = path.dirname(fileURLToPath(import.meta.url));
const ENV_FILE = process.env.ENV_FILE || path.join(HERE, "..", ".env.local");

const RESOLUTIONS_COL = "pbc_266170881"; // ysterbaard_resolutions
const ATTENDEES_COL = "pbc_1608833669"; // ysterbaard_resolution_attendees

const NEW_KINDS = ["director_change", "shareholder_change"];
const NEW_SHARE_ROLES = ["transferor", "transferee"];

// ---------------------------------------------------------------------------
// env
// ---------------------------------------------------------------------------

function loadEnv() {
  let raw = "";
  try {
    raw = readFileSync(ENV_FILE, "utf8");
  } catch {
    throw new Error(`Could not read env file: ${ENV_FILE}`);
  }
  // The "m" flag matters: without it "^" only anchors to the very start of the
  // file, so every key except a leading one reads as missing.
  const get = (key) => {
    const m = raw.match(new RegExp(`^\\s*${key}\\s*=\\s*"?([^"\\r\\n]+)`, "m"));
    return m ? m[1].trim() : "";
  };
  const cfg = {
    url: (process.env.PB_URL || get("PB_URL")).replace(/\/+$/, ""),
    email: process.env.PB_ADMIN_EMAIL || get("PB_ADMIN_EMAIL"),
    password: process.env.PB_ADMIN_PASSWORD || get("PB_ADMIN_PASSWORD"),
  };
  const missing = Object.entries(cfg)
    .filter(([, v]) => !v)
    .map(([k]) => k);
  if (missing.length) {
    throw new Error(
      `Missing config in ${ENV_FILE}: ${missing.join(", ")}. ` +
        `Set them in the file or pass as environment variables.`
    );
  }
  return cfg;
}

// ---------------------------------------------------------------------------
// pb
// ---------------------------------------------------------------------------

async function auth(cfg) {
  const res = await fetch(`${cfg.url}/api/collections/_superusers/auth-with-password`, {
    method: "POST",
    headers: { "Content-Type": "application/json" },
    body: JSON.stringify({ identity: cfg.email, password: cfg.password }),
  });
  if (!res.ok) {
    throw new Error(`Superuser auth failed: HTTP ${res.status} ${await res.text()}`);
  }
  return (await res.json()).token;
}

async function pbGet(token, url) {
  const res = await fetch(url, { headers: { Authorization: token }, cache: "no-store" });
  if (!res.ok) {
    throw new Error(`GET ${url} failed: HTTP ${res.status} ${await res.text()}`);
  }
  return res.json();
}

// This PocketBase instance serves collection updates from
// PATCH /api/collections/{id}. The two routes newer PocketBase builds expose
// (PUT /api/collections/{id} and the PUT /api/collections upsert) both return
// 404 here, so PATCH is the verb to use - verified against the live instance,
// not guessed.
async function pbPatch(token, url, body) {
  const res = await fetch(url, {
    method: "PATCH",
    headers: { Authorization: token, "Content-Type": "application/json" },
    body: JSON.stringify(body),
  });
  if (!res.ok) {
    throw new Error(`PATCH ${url} failed: HTTP ${res.status} ${await res.text()}`);
  }
  return res.json();
}

// ---------------------------------------------------------------------------
// schema helpers
// ---------------------------------------------------------------------------
//
// GET /api/collections/{id} returns the whole schema, including internal keys
// on every field. PATCH expects that same shape back, so the safe approach is:
// read -> mutate one slice -> write the rest verbatim.

// PocketBase stores select options as a plain array of strings on this
// instance (["existing","resigned",...]), NOT as {value,color} objects.
// optionValue tolerates both shapes so the script keeps working if a collection
// was ever edited through the admin UI.
function optionValue(v) {
  return typeof v === "string" ? v : (v && v.value) || "";
}

function optionValues(field) {
  return (field.values || []).map(optionValue).filter(Boolean);
}

function kindField() {
  return {
    name: "kind",
    type: "select",
    required: false,
    presentable: false,
    values: [...NEW_KINDS],
    maxSelect: 1,
    max: 0,
    min: 0,
    pattern: "",
    autogeneratePattern: false,
  };
}

function sharesField() {
  return {
    name: "shares",
    type: "number",
    required: false,
    presentable: false,
    onlyInt: true,
    min: null,
    max: null,
    system: false,
  };
}

/**
 * Strip server-managed keys from a field read out of PB before writing it back.
 * PocketBase derives `id` itself and refuses to accept `system: true` fields on
 * create, so both are dropped. `hidden` is preserved explicitly because PB
 * expects the key to be present.
 */
function stripServerKeys(field) {
  const { id, system, hidden, ...rest } = field;
  return { ...rest, hidden: Boolean(hidden), system: false };
}

function normaliseFields(fields) {
  return fields.map(stripServerKeys);
}

// ---------------------------------------------------------------------------
// steps
// ---------------------------------------------------------------------------

/**
 * Add `field` to a collection if `name` is not present.
 * Returns "added" | "present" | "would-add".
 */
async function ensureField({ token, base, colId, field, checkOnly, label }) {
  const url = `${base}/api/collections/${colId}`;
  const current = await pbGet(token, url);
  const fields = current.fields || [];

  if (fields.some((f) => f.name === field.name)) {
    console.log(`   - ${label}: already present - skipped`);
    return "present";
  }
  if (checkOnly) {
    console.log(`   - ${label}: would be added`);
    return "would-add";
  }
  const updated = await pbPatch(token, url, {
    ...current,
    fields: normaliseFields([...fields, field]),
  });
  if (!(updated.fields || []).some((f) => f.name === field.name)) {
    throw new Error(`${label}: PATCH succeeded but field is missing`);
  }
  console.log(`   + ${label}: added`);
  return "added";
}

/**
 * Append select options to an existing select field, keeping the current
 * options and their order intact.
 * Returns "added" | "present" | "would-add".
 */
async function ensureSelectOptions({
  token,
  base,
  colId,
  fieldName,
  newValues,
  checkOnly,
  label,
}) {
  const url = `${base}/api/collections/${colId}`;
  const current = await pbGet(token, url);
  const fields = current.fields || [];
  const field = fields.find((f) => f.name === fieldName);

  if (!field) {
    throw new Error(`Select field "${fieldName}" does not exist on collection ${colId}`);
  }
  if (field.type !== "select") {
    throw new Error(`Field "${fieldName}" is a "${field.type}", expected "select"`);
  }

  const have = new Set(optionValues(field));
  const missing = newValues.filter((v) => !have.has(v));
  if (missing.length === 0) {
    console.log(`   - ${label}: already present - skipped`);
    return "present";
  }
  if (checkOnly) {
    console.log(`   - ${label}: would add ${missing.join(", ")}`);
    return "would-add";
  }

  const updated = await pbPatch(token, url, {
    ...current,
    fields: normaliseFields(
      fields.map((f) =>
        f.name === fieldName ? { ...f, values: [...optionValues(f), ...missing] } : f
      )
    ),
  });
  const now = (updated.fields || []).find((f) => f.name === fieldName);
  const nowHave = new Set(optionValues(now || {}));
  const stillMissing = missing.filter((v) => !nowHave.has(v));
  if (stillMissing.length) {
    throw new Error(`${label}: PATCH succeeded but options missing`);
  }
  console.log(`   + ${label}: added ${missing.join(", ")}`);
  return "added";
}

// ---------------------------------------------------------------------------
// main
// ---------------------------------------------------------------------------

async function main() {
  const checkOnly = process.argv.includes("--check");
  const cfg = loadEnv();

  console.log("");
  console.log("PB migration - change in shareholders");
  console.log(`   target : ${cfg.url}`);
  console.log(`   mode   : ${checkOnly ? "CHECK ONLY (no writes)" : "APPLY"}`);
  console.log("");

  const token = await auth(cfg);

  console.log("1. ysterbaard_resolutions");
  await ensureField({
    token,
    base: cfg.url,
    colId: RESOLUTIONS_COL,
    field: kindField(),
    checkOnly,
    label: "kind select (director_change | shareholder_change)",
  });

  console.log("2. ysterbaard_resolution_attendees");
  await ensureField({
    token,
    base: cfg.url,
    colId: ATTENDEES_COL,
    field: sharesField(),
    checkOnly,
    label: "shares number",
  });
  await ensureSelectOptions({
    token,
    base: cfg.url,
    colId: ATTENDEES_COL,
    fieldName: "director_role",
    newValues: NEW_SHARE_ROLES,
    checkOnly,
    label: "director_role options (transferor | transferee)",
  });

  // ---- verify ----
  console.log("");
  console.log("Verification");
  const res = await pbGet(token, `${cfg.url}/api/collections/${RESOLUTIONS_COL}`);
  const att = await pbGet(token, `${cfg.url}/api/collections/${ATTENDEES_COL}`);

  const kind = (res.fields || []).find((f) => f.name === "kind");
  const shares = (att.fields || []).find((f) => f.name === "shares");
  const role = (att.fields || []).find((f) => f.name === "director_role");
  const roleValues = optionValues(role || {});

  console.log(`   resolutions.kind        : ${kind ? optionValues(kind).join(", ") : "MISSING"}`);
  console.log(
    `   attendees.shares        : ${
      shares ? `number${shares.onlyInt ? " (integer)" : ""}` : "MISSING"
    }`
  );
  console.log(`   attendees.director_role : ${roleValues.join(", ")}`);

  const problems = [];
  if (!kind) problems.push("resolutions.kind missing");
  if (!shares) problems.push("attendees.shares missing");
  for (const v of NEW_SHARE_ROLES) {
    if (!roleValues.includes(v)) problems.push(`director_role.${v} missing`);
  }
  // Guard the option set that section 4 depends on.
  for (const v of ["existing", "resigned", "appointed", "external"]) {
    if (!roleValues.includes(v)) problems.push(`director_role.${v} LOST`);
  }

  console.log("");
  if (problems.length) {
    console.error(`FAILED: ${problems.join("; ")}`);
    process.exitCode = 1;
    return;
  }
  console.log(
    checkOnly
      ? "Check complete. Re-run without --check to apply."
      : "Migration complete. The app now needs only record-level API access."
  );
  console.log("");
}

main().catch((err) => {
  console.error("");
  console.error("Migration failed:", err.message);
  console.error("");
  process.exitCode = 1;
});