/**
 * F-136 / POS-002 — POS basics: 6 new tables + seed.
 *
 * Creates the POS-specific tables. Idempotent (`IF NOT EXISTS` everywhere).
 *
 *   pos_stores            — physical storefronts (multi-store support)
 *   pos_terminals         — TPV devices with persistent binding
 *   pos_payment_methods   — configurable payment types per store
 *   pos_quick_products    — favorite product grid per scope
 *   pos_parked_tickets    — held tickets recoverable from any terminal in the store
 *   pos_cash_sessions     — register shift lifecycle (OPEN/CLOSED)
 *
 * Seed at the end (after all tables exist):
 *   - One pos_stores row with the well-known UUID used by the default-store
 *     backfill in migration 044 and by the checkout flow's DEFAULT_STORE_ID.
 *   - Two pos_payment_methods rows (cash, card) for the default store.
 *
 * @param {import('node-pg-migrate').MigrationBuilder} pgm
 */

/** Well-known UUID for the default store. Kept here as the source of truth. */
const DEFAULT_STORE_ID = '00000000-0000-0000-0000-000000000001';

export const up = (pgm) => {
  // ── pos_stores ────────────────────────────────────────────────────────────
  pgm.createTable('pos_stores', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    name: { type: 'text', notNull: true, check: "length(name) BETWEEN 1 AND 200" },
    slug: { type: 'text', notNull: true, unique: true, check: "slug ~ '^[a-z0-9]+(?:-[a-z0-9]+)*$'" },
    address: { type: 'text' },
    tax_id: { type: 'text' },
    contact_email: { type: 'text' },
    contact_phone: { type: 'text' },
    receipt_header: { type: 'text' },
    receipt_footer: { type: 'text' },
    settings: { type: 'jsonb', notNull: true, default: pgm.func("'{}'::jsonb") },
    active: { type: 'boolean', notNull: true, default: true },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });

  // ── pos_terminals ─────────────────────────────────────────────────────────
  pgm.createTable('pos_terminals', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    store_id: { type: 'uuid', notNull: true, references: 'pos_stores(id)', onDelete: 'RESTRICT' },
    name: { type: 'text', notNull: true, check: "length(name) BETWEEN 1 AND 100" },
    binding_code: { type: 'text', unique: true },
    bound_at: { type: 'timestamptz' },
    status: {
      type: 'text',
      notNull: true,
      default: 'active',
      check: "status IN ('active','disabled','decommissioned')",
    },
    interface_mode: {
      type: 'text',
      notNull: true,
      default: 'auto',
      check: "interface_mode IN ('desktop','touch','auto')",
    },
    settings: { type: 'jsonb', notNull: true, default: pgm.func("'{}'::jsonb") },
    last_seen_at: { type: 'timestamptz' },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });
  pgm.createIndex('pos_terminals', 'store_id', { name: 'pos_terminals_store_idx' });
  pgm.createIndex('pos_terminals', 'binding_code', {
    name: 'pos_terminals_binding_code_idx',
    where: 'binding_code IS NOT NULL',
  });

  // ── pos_payment_methods ───────────────────────────────────────────────────
  pgm.createTable('pos_payment_methods', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    store_id: { type: 'uuid', notNull: true, references: 'pos_stores(id)', onDelete: 'CASCADE' },
    code: { type: 'text', notNull: true, check: "length(code) BETWEEN 1 AND 32" },
    label: { type: 'text', notNull: true, check: "length(label) BETWEEN 1 AND 64" },
    kind: { type: 'text', notNull: true, check: "kind IN ('cash','card','other')" },
    active: { type: 'boolean', notNull: true, default: true },
    sort_order: { type: 'integer', notNull: true, default: 0 },
    config: { type: 'jsonb', notNull: true, default: pgm.func("'{}'::jsonb") },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  }, { constraints: { unique: ['store_id', 'code'] } });
  pgm.createIndex('pos_payment_methods', ['store_id', 'sort_order'], {
    name: 'pos_payment_methods_store_active_idx',
    where: 'active',
  });

  // ── pos_quick_products ────────────────────────────────────────────────────
  pgm.createTable('pos_quick_products', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    store_id: { type: 'uuid', notNull: true, references: 'pos_stores(id)', onDelete: 'CASCADE' },
    terminal_id: { type: 'uuid', references: 'pos_terminals(id)', onDelete: 'CASCADE' },
    user_id: { type: 'uuid', references: 'backoffice_users(id)', onDelete: 'CASCADE' },
    variant_id: { type: 'uuid', notNull: true, references: 'catalog_product_variants(id)', onDelete: 'CASCADE' },
    position: { type: 'integer', notNull: true, default: 0 },
    active: { type: 'boolean', notNull: true, default: true },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });

  // ── pos_parked_tickets ───────────────────────────────────────────────────
  pgm.createTable('pos_parked_tickets', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    store_id: { type: 'uuid', notNull: true, references: 'pos_stores(id)', onDelete: 'CASCADE' },
    terminal_id: { type: 'uuid', notNull: true, references: 'pos_terminals(id)', onDelete: 'RESTRICT' },
    user_id: { type: 'uuid', notNull: true, references: 'backoffice_users(id)', onDelete: 'RESTRICT' },
    customer_id: { type: 'uuid', references: 'identity_users(id)', onDelete: 'SET NULL' },
    label: { type: 'text' },
    cart: { type: 'jsonb', notNull: true },
    expires_at: {
      type: 'timestamptz',
      notNull: true,
      default: pgm.func("(now() + interval '24 hours')"),
    },
    recalled_at: { type: 'timestamptz' },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });
  pgm.createIndex('pos_parked_tickets', ['store_id', { name: 'created_at', sort: 'DESC' }], {
    name: 'pos_parked_tickets_store_active_idx',
    where: 'recalled_at IS NULL',
  });

  // ── pos_cash_sessions ────────────────────────────────────────────────────
  pgm.createTable('pos_cash_sessions', {
    id: { type: 'uuid', primaryKey: true, default: pgm.func('gen_random_uuid()') },
    terminal_id: { type: 'uuid', notNull: true, references: 'pos_terminals(id)', onDelete: 'RESTRICT' },
    store_id: { type: 'uuid', notNull: true, references: 'pos_stores(id)', onDelete: 'RESTRICT' },
    user_id: { type: 'uuid', notNull: true, references: 'backoffice_users(id)', onDelete: 'RESTRICT' },
    status: { type: 'text', notNull: true, default: 'OPEN', check: "status IN ('OPEN','CLOSED')" },
    opened_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    closed_at: { type: 'timestamptz' },
    opening_cash_cents: { type: 'integer', notNull: true, default: 0, check: 'opening_cash_cents >= 0' },
    closing_cash_cents: { type: 'integer' },
    expected_cash_cents: { type: 'integer' },
    actual_cash_cents: { type: 'integer' },
    difference_cents: { type: 'integer' },
    notes: { type: 'text' },
    created_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
    updated_at: { type: 'timestamptz', notNull: true, default: pgm.func('now()') },
  });
  // Only one OPEN session per terminal at a time.
  pgm.createIndex('pos_cash_sessions', 'terminal_id', {
    name: 'pos_cash_sessions_open_per_terminal_idx',
    unique: true,
    where: "status = 'OPEN'",
  });
  pgm.createIndex('pos_cash_sessions', 'store_id', { name: 'pos_cash_sessions_store_idx' });
  pgm.createIndex('pos_cash_sessions', 'user_id', { name: 'pos_cash_sessions_user_idx' });

  // ── Seeds ────────────────────────────────────────────────────────────────
  // The default store; this UUID is also referenced as DEFAULT_STORE_ID from
  // the inventory module (see 044_pos_inventory_store.js and
  // project/src/modules/inventory/domain/ports.ts).
  pgm.sql(`
    INSERT INTO pos_stores (id, name, slug, active, receipt_header, receipt_footer)
    VALUES (
      '${DEFAULT_STORE_ID}',
      'Natural - Mercado de Vida',
      'natural-mercado-de-vida',
      true,
      'Natural - Mercado de Vida',
      'Gracias por su compra'
    )
    ON CONFLICT (id) DO NOTHING
  `);

  pgm.sql(`
    INSERT INTO pos_payment_methods (store_id, code, label, kind, sort_order)
    VALUES
      ('${DEFAULT_STORE_ID}', 'cash', 'Efectivo', 'cash', 0),
      ('${DEFAULT_STORE_ID}', 'card', 'Tarjeta', 'card', 1)
    ON CONFLICT (store_id, code) DO NOTHING
  `);
};

export const down = (pgm) => {
  // Drop in reverse dependency order. The CASCADE on FKs cleans up dependent
  // rows automatically.
  pgm.dropTable('pos_cash_sessions');
  pgm.dropTable('pos_parked_tickets');
  pgm.dropTable('pos_quick_products');
  pgm.dropTable('pos_payment_methods');
  pgm.dropTable('pos_terminals');
  pgm.dropTable('pos_stores');
};