import { FREIGHT_PERMS } from '../../../seed/freight-permissions.registry';
import { Invoice } from '../../billing/entities/invoice.entity';
import { invoicePaymentMethodExpr } from '../../billing/invoice-settlement.util';
import { PaymentEntity } from '../../payment/entities/payment.entity';
import { Booking } from '../../bookings/entities/booking.entity';
import { Company } from '../../companies/entities/company.entity';
import { CompanyProfile } from '../../companies/entities/company-profile.entity';
import { ShippingLineCompany } from '../../shipping-lines/entities/shipping-line-company.entity';
import { applyBookingRefDirectionScope } from '../../user-trade-access/trade-scope.util';
import { ExportDataset } from '../export.types';

/** Same expression the list endpoint filters by, in this dataset's aliases. */
const PAYMENT_METHOD = invoicePaymentMethodExpr('i', 'p');

/**
 * Sensitive EIMS internals are deliberately absent: `eims_signed_qr` (a
 * signature blob) and `eims_last_error` (a raw error dump). The
 * human-meaningful status/IRN/document-number fields are kept.
 */
export const invoicesDataset: ExportDataset = {
  key: 'invoices',
  title: 'Invoices',
  description: 'Invoices with customer, amounts, payment status and EIMS state',
  group: 'Finance',
  permission: FREIGHT_PERMS.invoices.view,
  base: { entity: Invoice, alias: 'i' },

  joins: [
    { alias: 'c', entity: Company, on: 'c.id = i.company_id' },
    { alias: 'cp', entity: CompanyProfile, on: 'cp.id = i.company_profile_id' },
    // No relation object on the entity for this FK — the service hydrates it
    // with a second query. In a dataset it is just a join by column.
    { alias: 'slc', entity: ShippingLineCompany, on: 'slc.id = i.shipping_line_company_id' },
    { alias: 'rel', entity: Invoice, on: 'rel.id = i.related_invoice_id' },
    // The gateway payment behind the invoice — provider method and its
    // transaction reference. Always joined: `scope()` filters on it.
    { alias: 'p', entity: PaymentEntity, on: 'p.id = i.payment_id' },
    // Booking behind the invoice, for the PNR alone. `i.source_id` is a bare
    // varchar pointer that is not always a UUID (EIMS self-test rows carry a
    // slug), so the cast goes on `bk.id`, never on `source_id` — casting the
    // other way throws on those rows.
    { alias: 'bk', entity: Booking, on: "bk.id::text = i.source_id AND i.source = 'booking'" },
  ],
  alwaysJoin: ['c', 'p', 'bk'],

  groups: [
    { id: 'invoice', label: 'Invoice' },
    { id: 'customer', label: 'Customer' },
    { id: 'amounts', label: 'Amounts' },
    { id: 'payment', label: 'Payment' },
    { id: 'lines', label: 'Lines' },
    { id: 'eims', label: 'EIMS' },
  ],

  fields: [
    { key: 'invoiceNumber', label: 'Invoice no.', type: 'string', group: 'invoice', default: true, select: 'i.invoice_number', sortExpr: 'i.invoice_number' },
    { key: 'status', label: 'Status', type: 'string', group: 'invoice', default: true, select: 'i.status', sortExpr: 'i.status' },
    { key: 'type', label: 'Type', type: 'string', group: 'invoice', select: 'i.type' },
    { key: 'source', label: 'Source', type: 'string', group: 'invoice', default: true, select: 'i.source' },
    { key: 'sourceId', label: 'Source reference', type: 'string', group: 'invoice', select: 'i.source_id' },
    { key: 'issuedAt', label: 'Issued', type: 'date', group: 'invoice', default: true, select: `to_char(i.issued_at, 'YYYY-MM-DD')`, sortExpr: 'i.issued_at' },
    { key: 'dueAt', label: 'Due', type: 'date', group: 'invoice', default: true, select: `to_char(i.due_at, 'YYYY-MM-DD')`, sortExpr: 'i.due_at' },
    { key: 'createdAt', label: 'Created', type: 'date', group: 'invoice', select: `to_char(i.created_at, 'YYYY-MM-DD')`, sortExpr: 'i.created_at' },
    { key: 'relatedInvoice', label: 'Related invoice', type: 'string', group: 'invoice', requires: ['rel'], select: 'rel.invoice_number' },

    { key: 'customer', label: 'Customer', type: 'string', group: 'customer', default: true, requires: ['c'], select: 'c.name', sortExpr: 'c.name' },
    { key: 'customerTin', label: 'Customer TIN', type: 'string', group: 'customer', requires: ['c'], select: 'c.tin' },
    { key: 'customerVat', label: 'Customer VAT no.', type: 'string', group: 'customer', requires: ['c'], select: 'c.vat_number' },
    { key: 'customerPhone', label: 'Customer phone', type: 'string', group: 'customer', requires: ['c'], select: 'c.phone' },
    { key: 'customerEmail', label: 'Customer email', type: 'string', group: 'customer', requires: ['c'], select: 'c.email' },
    { key: 'customerAddress', label: 'Customer address', type: 'string', group: 'customer', requires: ['c'], select: 'c.address' },
    { key: 'customerProfileRef', label: 'Profile reference', type: 'string', group: 'customer', requires: ['cp'], select: 'cp.reference' },
    { key: 'shippingLineCompany', label: 'Shipping line company', type: 'string', group: 'customer', requires: ['slc'], select: 'slc.name' },

    { key: 'subtotalAmount', label: 'Subtotal', type: 'money', group: 'amounts', select: 'i.subtotal_amount::float8' },
    { key: 'taxAmount', label: 'Tax', type: 'money', group: 'amounts', select: 'i.tax_amount::float8' },
    { key: 'totalAmount', label: 'Total', type: 'money', group: 'amounts', default: true, select: 'i.total_amount::float8', sortExpr: 'i.total_amount' },
    { key: 'paidAmount', label: 'Paid', type: 'money', group: 'amounts', default: true, select: 'i.paid_amount::float8' },
    { key: 'balanceAmount', label: 'Balance', type: 'money', group: 'amounts', default: true, select: 'i.balance_amount::float8', sortExpr: 'i.balance_amount' },
    { key: 'currency', label: 'Currency', type: 'string', group: 'amounts', default: true, select: 'i.currency' },

    { key: 'paidAt', label: 'Paid at', type: 'datetime', group: 'payment', select: `to_char(i.paid_at, 'YYYY-MM-DD HH24:MI')` },
    { key: 'paymentMethod', label: 'Payment method', type: 'string', group: 'payment', default: true, requires: ['p'], select: PAYMENT_METHOD, sortExpr: PAYMENT_METHOD },
    { key: 'transactionRef', label: 'Transaction ref', type: 'string', group: 'payment', requires: ['p'], select: 'p.transaction_id' },
    // The CBE_BILL reference the customer pays against — stamped onto the
    // booking at payment-initiation time, not held on the invoice or payment.
    { key: 'pnrCode', label: 'PNR', type: 'string', group: 'payment', requires: ['bk'], select: 'bk.pnr_code' },
    { key: 'paymentStatus', label: 'Payment status', type: 'string', group: 'payment', requires: ['p'], select: 'p.status::text' },
    {
      key: 'daysOverdue', label: 'Days overdue', type: 'number', group: 'payment',
      select: `CASE WHEN i.balance_amount > 0 AND i.due_at < now()
                    THEN EXTRACT(DAY FROM now() - i.due_at)::int ELSE 0 END`,
    },

    {
      key: 'lineCount', label: 'Line count', type: 'number', group: 'lines',
      select: `(SELECT COUNT(*)::int FROM freight.invoice_lines il
                WHERE il.invoice_id = i.id AND il.deleted_at IS NULL)`,
    },
    {
      key: 'lineCharges', label: 'Charges', type: 'string', group: 'lines',
      select: `(SELECT string_agg(il.charge_type || ': ' || ROUND(il.amount, 2), ' | ' ORDER BY il.charge_type)
                FROM freight.invoice_lines il
                WHERE il.invoice_id = i.id AND il.deleted_at IS NULL)`,
    },

    { key: 'eimsStatus', label: 'EIMS status', type: 'string', group: 'eims', select: 'i.eims_status' },
    { key: 'eimsIrn', label: 'EIMS IRN', type: 'string', group: 'eims', select: 'i.eims_irn' },
    { key: 'eimsDocumentNumber', label: 'EIMS document no.', type: 'string', group: 'eims', select: 'i.eims_document_number' },
    { key: 'eimsDocumentType', label: 'EIMS document type', type: 'string', group: 'eims', select: 'i.eims_document_type' },
    { key: 'eimsSubmittedAt', label: 'EIMS submitted', type: 'datetime', group: 'eims', select: `to_char(i.eims_submitted_at, 'YYYY-MM-DD HH24:MI')` },
    // eims_ack_date is varchar in the schema, not a timestamp.
    { key: 'eimsAckDate', label: 'EIMS acknowledged', type: 'string', group: 'eims', select: 'i.eims_ack_date' },
    { key: 'eimsCancelledAt', label: 'EIMS cancelled', type: 'datetime', group: 'eims', select: `to_char(i.eims_cancelled_at, 'YYYY-MM-DD HH24:MI')` },
    { key: 'eimsCancellationReasonCode', label: 'EIMS cancellation reason', type: 'string', group: 'eims', select: 'i.eims_cancellation_reason_code' },
  ],

  filters: [
    { key: 'issued', label: 'Issued', type: 'daterange' },
    { key: 'due', label: 'Due', type: 'daterange' },
    { key: 'statuses', label: 'Status', type: 'multiselect' },
    // The invoices list page sends a single `status`; accept both so its
    // on-screen filter actually carries into the export.
    { key: 'status', label: 'Status (single)', type: 'text' },
    { key: 'sources', label: 'Source', type: 'multiselect' },
    { key: 'types', label: 'Type', type: 'multiselect' },
    { key: 'eimsStatuses', label: 'EIMS status', type: 'multiselect' },
    { key: 'paymentMethods', label: 'Payment method', type: 'multiselect' },
    { key: 'currency', label: 'Currency', type: 'select', options: [
      { value: 'ETB', label: 'ETB' },
      { value: 'USD', label: 'USD' },
      { value: 'DJF', label: 'DJF' },
    ] },
    { key: 'minAmount', label: 'Min total', type: 'text' },
    { key: 'maxAmount', label: 'Max total', type: 'text' },
    { key: 'hasBalance', label: 'Outstanding only', type: 'text' },
    { key: 'overdue', label: 'Overdue only', type: 'text' },
    { key: 'companyId', label: 'Customer', type: 'text' },
    { key: 'search', label: 'Search invoice no., customer, PNR or transaction ref', type: 'text' },
  ],

  defaultSort: { key: 'issuedAt', dir: 'DESC' },

  scope(ctx, qb) {
    const { params, directions } = ctx;
    qb.andWhere('i.deleted_at IS NULL');
    if (params.issuedFrom) qb.andWhere('i.issued_at >= :issuedFrom', { issuedFrom: params.issuedFrom });
    if (params.issuedTo) qb.andWhere('i.issued_at < :issuedTo', { issuedTo: params.issuedTo });
    if (params.dueFrom) qb.andWhere('i.due_at >= :dueFrom', { dueFrom: params.dueFrom });
    if (params.dueTo) qb.andWhere('i.due_at < :dueTo', { dueTo: params.dueTo });
    const statuses = params.statuses as string[] | null;
    if (statuses?.length) qb.andWhere('i.status IN (:...statuses)', { statuses });
    if (params.status) qb.andWhere('i.status = :status', { status: params.status });
    const sources = params.sources as string[] | null;
    if (sources?.length) qb.andWhere('i.source IN (:...sources)', { sources });
    const types = params.types as string[] | null;
    if (types?.length) qb.andWhere('i.type IN (:...types)', { types });
    const eimsStatuses = params.eimsStatuses as string[] | null;
    if (eimsStatuses?.length) qb.andWhere('i.eims_status IN (:...eimsStatuses)', { eimsStatuses });
    const paymentMethods = params.paymentMethods as string[] | null;
    if (paymentMethods?.length) {
      qb.andWhere(`${PAYMENT_METHOD} IN (:...paymentMethods)`, { paymentMethods });
    }
    // Casing has drifted in the data ("usd" rows exist) — normalise both sides,
    // same as the list endpoint does.
    if (params.currency) {
      qb.andWhere('UPPER(i.currency) = :currency', {
        currency: String(params.currency).toUpperCase(),
      });
    }
    if (params.minAmount) qb.andWhere('i.total_amount >= :minAmount', { minAmount: Number(params.minAmount) });
    if (params.maxAmount) qb.andWhere('i.total_amount <= :maxAmount', { maxAmount: Number(params.maxAmount) });
    if (params.hasBalance === 'true') qb.andWhere('i.balance_amount > 0');
    // Computed, not `status = OVERDUE` — nothing sweeps PENDING rows into it.
    if (params.overdue === 'true') qb.andWhere('i.balance_amount > 0 AND i.due_at < now()');
    if (params.companyId) qb.andWhere('i.company_id = :companyId', { companyId: params.companyId });
    if (params.search) {
      // Same reach as the list page's search box, minus the source-record
      // lookups it does with correlated subqueries: number, customer, the PNR
      // the customer pays against, and the payment references support desks
      // quote back.
      qb.andWhere(
        `(i.invoice_number ILIKE :search
          OR c.name ILIKE :search
          OR bk.pnr_code ILIKE :search
          OR p.transaction_id ILIKE :search
          OR p.merchant_order_id ILIKE :search)`,
        { search: `%${params.search as string}%` },
      );
    }
    // ACL: invoices.source_id is a varchar pointer at the originating booking.
    applyBookingRefDirectionScope(qb, 'i.source_id', directions);
  },
};