/**
 * One-shot PocketBase schema setup for RJ Bulk rebuild.
 *
 * Run with: pnpm tsx scripts/setup-pb.mjs
 *
 * Notes about the deployed PB instance:
 *  - It is a pre-v0.22 build that does not support first-class `relation` or
 *    `select` field types. We work around it by:
 *      - Using `text` fields for foreign keys (joined via expand= at query
 *        time — see lib/pocketbase.ts for helpers).
 *      - Using `text` fields for enums (status, action) and validating the
 *        allowed values at the app layer with Zod schemas.
 *
 * Idempotent: re-running is safe; existing schema is updated, not duplicated.
 */

import PocketBase from "pocketbase";

const PB_URL = process.env.POCKETBASE_URL || "http://pocketbase-zinlbpsext2ro0lgb2558vfy.169.239.180.130.sslip.io";
const ADMIN_EMAIL = process.env.PB_ADMIN_EMAIL || "David.els1@outlook.com";
const ADMIN_PASS = process.env.PB_ADMIN_PASS || "1234567890";

const APP_USER_EMAIL = process.env.APP_USER_EMAIL || "david@rjbulk.local";
const APP_USER_PASS = process.env.APP_USER_PASS || "ChangeMe123!";
const APP_USER_NAME = process.env.APP_USER_NAME || "David Els";

const pb = new PocketBase(PB_URL);

function log(msg) {
  console.log(`[setup-pb] ${msg}`);
}

async function authAsAdmin() {
  log(`Authenticating as superuser ${ADMIN_EMAIL}...`);
  await pb.admins.authWithPassword(ADMIN_EMAIL, ADMIN_PASS);
  log(`Authenticated.`);
}

async function getCollection(name) {
  return await pb.collections.getOne(name).catch(() => null);
}

async function deleteCollection(name) {
  try {
    await pb.collections.delete(name);
    log(`Deleted collection: ${name}`);
  } catch (err) {
    if (err.status === 404) return;
    throw err;
  }
}

async function createCollection(payload) {
  return await pb.collections.create(payload);
}

async function updateCollection(id, payload) {
  return await pb.collections.update(id, payload);
}

function text(name, required = false, max = 200) {
  return {
    name,
    type: "text",
    required,
    system: false,
    options: { min: required ? 1 : 0, max, pattern: "" },
  };
}

function number(name, required = false, noDecimal = false) {
  return {
    name,
    type: "number",
    required,
    system: false,
    options: { min: null, max: null, noDecimal },
  };
}

function date(name, required = true) {
  return {
    name,
    type: "date",
    required,
    system: false,
    options: { min: "", max: "" },
  };
}

function email(name, required = false) {
  return {
    name,
    type: "email",
    required,
    system: false,
    options: { min: 0, max: 200, exceptDomains: null, onlyDomains: null },
  };
}

function bool(name, required = false) {
  return {
    name,
    type: "bool",
    required,
    system: false,
    options: {},
  };
}

function id() {
  return {
    name: "id",
    type: "text",
    required: true,
    system: true,
    options: { autogeneratePattern: "[a-z0-9]{15}", min: 15, max: 15, pattern: "^[a-z0-9]+$" },
  };
}

const AUTH_RULES = {
  listRule: '@request.auth.id != ""',
  viewRule: '@request.auth.id != ""',
  createRule: '@request.auth.id != ""',
  updateRule: '@request.auth.id != ""',
  deleteRule: '@request.auth.id != ""',
};

async function ensureCollection(name, fields, indexes = []) {
  const existing = await getCollection(name);
  // First pass: schema only, no indexes (avoids "no such column" race)
  if (existing) {
    log(`Updating ${name} (id=${existing.id}) — schema`);
    await updateCollection(existing.id, { ...AUTH_RULES, name, type: "base", fields, indexes: [] });
  } else {
    log(`Creating ${name} collection`);
    await createCollection({ ...AUTH_RULES, name, type: "base", fields, indexes: [], system: false });
  }
  // Second pass: add indexes (columns now exist)
  if (indexes.length > 0) {
    const cur = await getCollection(name);
    await updateCollection(cur.id, { indexes });
    log(`  ${name}: added ${indexes.length} index(es)`);
  }
}

async function buildCustomers() {
  await ensureCollection("customers", [
    id(),
    text("name", true, 200),
    text("contact_number", false, 50),
    email("email", false),
    text("address", false, 1000),
    text("vat_number", false, 50),
  ], [
    "CREATE INDEX idx_customers_name ON customers (name)",
  ]);
}

async function buildSuppliers() {
  await ensureCollection("suppliers", [
    id(),
    text("name", true, 200),
    text("contact_number", false, 50),
    email("email", false),
    text("address", false, 1000),
    text("vat_number", false, 50),
  ], [
    "CREATE INDEX idx_suppliers_name ON suppliers (name)",
  ]);
}

async function buildDeliveryNotes() {
  // status is validated as enum at app layer (see lib/delivery-status.ts)
  await ensureCollection("delivery_notes", [
    id(),
    text("number", true, 100),         // DN-...
    date("date", true),
    text("customer", true, 30),        // FK -> customers.id (joined via expand=customer)
    text("vehicle_registration", false, 100),
    number("qty_litres_supplied", true, false),  // decimal allowed
    text("plant_dispensing", false, 100),
    text("status", false, 50),          // enum: Pending | EFT | CASH | CARD
    text("old_status", false, 50),      // legacy value preserved (Statement Viewed, Invoiced, etc.)
    number("price_per_litre", false, false),
    number("total_value", false, false),
    text("pricing_source", false, 50),  // enum: special | monthly | default
  ], [
    "CREATE INDEX idx_dn_customer_date ON delivery_notes (customer, date)",
    "CREATE INDEX idx_dn_status_date ON delivery_notes (status, date)",
    "CREATE UNIQUE INDEX idx_dn_number ON delivery_notes (number)",
  ]);
}

async function buildFuelPurchases() {
  await ensureCollection("fuel_purchases", [
    id(),
    text("supplier", true, 30),         // FK -> suppliers.id
    number("purchase_qty", true, false),
    number("purchase_price", true, false),
    date("purchase_date", true),
  ], [
    "CREATE INDEX idx_fp_supplier ON fuel_purchases (supplier)",
    "CREATE INDEX idx_fp_date ON fuel_purchases (purchase_date)",
  ]);
}

async function buildCustomerPricing() {
  await ensureCollection("customer_pricing", [
    id(),
    text("customer", true, 30),           // FK -> customers.id
    number("year", true, true),
    number("month", true, true),          // 1-12
    number("price_per_litre", true, false),
    number("special_price", false, false),
    text("created_by", false, 30),        // FK -> users.id
  ], [
    "CREATE UNIQUE INDEX idx_cp_unique ON customer_pricing (customer, year, month)",
  ]);
}

async function buildMonthlyPriceIncreases() {
  await ensureCollection("monthly_price_increases", [
    id(),
    number("year", true, true),
    number("month", true, true),          // 1-12
    number("percentage_increase", true, false), // actually cents
    text("applied_by", false, 30),        // FK -> users.id
  ], [
    "CREATE UNIQUE INDEX idx_mpi_unique ON monthly_price_increases (year, month)",
  ]);
}

async function buildFuelSettings() {
  await ensureCollection("fuel_settings", [
    id(),
    number("default_price_per_litre", true, false),
    email("statement_cc_email", false),
    email("statement_from_email", false),
    text("statement_email_password", false, 500), // plain text — production should encrypt
    email("statement_app_email", false),
  ], []);

  // Seed default price singleton if not already seeded
  const list = await pb.collection("fuel_settings").getList(1, 1);
  if (list.items.length === 0) {
    log("Seeding fuel_settings singleton with default price 20.50");
    await pb.collection("fuel_settings").create({ default_price_per_litre: 20.5 });
  }
}

async function buildStatementLog() {
  await ensureCollection("statement_log", [
    id(),
    text("action", true, 50),       // enum: Email Sent | Preview Generated
    text("details", false, 500),
    text("actor", false, 30),       // FK -> users.id
  ], []);
}

async function ensureAppUser() {
  log(`Ensuring app user ${APP_USER_EMAIL} exists...`);
  try {
    const existing = await pb.collection("users").getFirstListItem(`email = "${APP_USER_EMAIL}"`);
    log(`App user already exists (id=${existing.id}).`);
  } catch (err) {
    if (err.status === 404) {
      const created = await pb.collection("users").create({
        email: APP_USER_EMAIL,
        password: APP_USER_PASS,
        passwordConfirm: APP_USER_PASS,
        name: APP_USER_NAME,
        emailVisibility: true,
        verified: true,
      });
      log(`✅ Created app user (id=${created.id}). Login: ${APP_USER_EMAIL} / ${APP_USER_PASS}`);
    } else {
      throw err;
    }
  }
}

async function ensureUsersCollection() {
  // 'users' is a built-in auth collection. Patch its rules so any authed user
  // can read the directory (needed for `expand=` to resolve FKs).
  const cur = await getCollection("users");
  if (cur) {
    await updateCollection(cur.id, {
      listRule: '@request.auth.id != ""',
      viewRule: '@request.auth.id != ""',
      // createRule null = admin only (invite flow)
      // updateRule / deleteRule stay as self-only (PB default)
    });
    log("Users collection rules updated");
  }
}

async function main() {
  await authAsAdmin();

  // Drop leftover junk
  await deleteCollection("test_fields_key");
  await deleteCollection("test_h1");
  await deleteCollection("test_h2");
  await deleteCollection("test_h3");
  await deleteCollection("test_h4");
  await deleteCollection("test_sel");

  // Build all collections
  await ensureUsersCollection();
  await buildCustomers();
  await buildSuppliers();
  await buildDeliveryNotes();
  await buildFuelPurchases();
  await buildCustomerPricing();
  await buildMonthlyPriceIncreases();
  await buildFuelSettings();
  await buildStatementLog();

  // App user
  await ensureAppUser();

  log("✅ Schema setup complete.");
  log("   App user:  " + APP_USER_EMAIL + " / " + APP_USER_PASS);
}

main().catch((err) => {
  console.error("[setup-pb] FAILED:", err);
  process.exit(1);
});