import { Body, Controller, Get, Param, ParseUUIDPipe, Post, Res } from "@nestjs/common";
import { ApiBearerAuth, ApiOperation, ApiTags } from "@nestjs/swagger";
import type { Response } from "express";

import { BookingStaff } from "../../common/booking-guards";
import { FREIGHT_PERMS } from "../../seed/freight-permissions.registry";
import { sendPdf } from "../billing/billing.controller";
import { BulkCancelEimsRegistrationDto } from "./dto/bulk-cancel-eims-registration.dto";
import { CancelEimsRegistrationDto } from "./dto/cancel-eims-registration.dto";
import { RegisterSalesReceiptDto } from "./dto/register-sales-receipt.dto";
import { RegisterWithholdingReceiptDto } from "./dto/register-withholding-receipt.dto";
import { ResolveEimsRegistrationDto } from "./dto/resolve-eims-registration.dto";
import { EimsCancellationService } from "./eims-cancellation.service";
import { EimsInvoiceRegistrationService } from "./eims-invoice-registration.service";
import { EimsReceiptService } from "./eims-receipt.service";

/**
 * Manual EIMS actions on an existing invoice.
 *
 * Invoices are produced by the freight workflow, not by a person, so these routes are **not** the
 * normal production path — they exist for controlled testing and exceptional operations. Automatic
 * submission after an invoice is issued is a separate phase; nothing here is called by it.
 *
 * `eims_register`, `eims_resolve`, `eims_cancel` and `eims_receipt_register` are intentionally left
 * out of every role preset and assigned to named admins instead. They are also separate
 * permissions: resolving clears the system-wide chain block and can record an IRN against an
 * invoice, cancelling is its own irreversible-at-MoR action, and filing a receipt is a third —
 * none follows from the right to register. Only `eims/status` and `eims/receipts` ride on the
 * ordinary `invoices:view`.
 *
 * Filing gets its own permission (`invoices:eims_register`) rather than riding on an existing key:
 * registration is irreversible at MoR, so it must not follow from the right to download a PDF.
 * The key is seeded through FINANCE_PERMISSIONS, which reaches `iam.permissions` via
 * ADVANCED_BACKOFFICE_PERMISSIONS → BOOKING_RULE_ENGINE_PERMISSIONS → EDR_FREIGHT_PERMISSIONS.
 */
@ApiTags("eims")
@ApiBearerAuth()
@Controller("invoices")
export class EimsInvoiceController {
  constructor(
    private readonly registration: EimsInvoiceRegistrationService,
    private readonly cancellation: EimsCancellationService,
    private readonly receipts: EimsReceiptService,
  ) {}

  @Post(":id/eims/register")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsRegister)
  @ApiOperation({
    summary:
      "Register the invoice with MoR EIMS. Idempotent — an invoice that already has an IRN is returned unchanged.",
  })
  register(@Param("id", ParseUUIDPipe) id: string) {
    return this.registration.registerInvoiceWithEims(id);
  }

  @Post(":id/eims/verify")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsRegister)
  @ApiOperation({ summary: "Verify the invoice's stored IRN against EIMS" })
  verify(@Param("id", ParseUUIDPipe) id: string) {
    return this.registration.verifyInvoiceWithEims(id);
  }

  @Post(":id/eims/resolve")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsResolve)
  @ApiOperation({
    summary:
      "Resolve an unacknowledged submission: record the IRN confirmed with MoR, or discard it. Clears the system-wide block.",
  })
  resolve(
    @Param("id", ParseUUIDPipe) id: string,
    @Body() dto: ResolveEimsRegistrationDto,
  ) {
    return this.registration.resolveEimsRegistration(id, dto);
  }

  @Get(":id/eims/status")
  @BookingStaff(FREIGHT_PERMS.invoices.view)
  @ApiOperation({ summary: "EIMS registration status, IRN and last error for the invoice" })
  status(@Param("id", ParseUUIDPipe) id: string) {
    return this.registration.getEimsStatus(id);
  }

  @Post(":id/eims/cancel")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsCancel)
  @ApiOperation({
    summary:
      "Cancel the invoice's registered EIMS document. Refuses (409) an already-cancelled invoice rather than a silent no-op — see IRC-N010.",
  })
  cancel(@Param("id", ParseUUIDPipe) id: string, @Body() dto: CancelEimsRegistrationDto) {
    return this.cancellation.cancelInvoiceWithEims(id, dto.reasonCode, dto.remark);
  }

  @Post("eims/bulk-cancel")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsCancel)
  @ApiOperation({
    summary:
      "Cancel multiple invoices' registered EIMS documents in one call. Each invoice's outcome is " +
      "reported independently — one failure never blocks the rest.",
  })
  bulkCancel(@Body() dto: BulkCancelEimsRegistrationDto) {
    return this.cancellation.cancelBulkWithEims(dto.items);
  }

  @Post(":id/eims/receipt/sales")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsReceiptRegister)
  @ApiOperation({ summary: "Register a sales receipt with MoR EIMS against a registered invoice" })
  registerSalesReceipt(@Param("id", ParseUUIDPipe) id: string, @Body() dto: RegisterSalesReceiptDto) {
    return this.receipts.registerSalesReceipt(id, dto);
  }

  @Post(":id/eims/receipt/withholding")
  @BookingStaff(FREIGHT_PERMS.invoices.eimsReceiptRegister)
  @ApiOperation({ summary: "Register a withholding receipt with MoR EIMS against a registered invoice" })
  registerWithholdingReceipt(
    @Param("id", ParseUUIDPipe) id: string,
    @Body() dto: RegisterWithholdingReceiptDto,
  ) {
    return this.receipts.registerWithholdingReceipt(id, dto);
  }

  @Get(":id/eims/receipts")
  @BookingStaff(FREIGHT_PERMS.invoices.view)
  @ApiOperation({ summary: "List every EIMS receipt filed against this invoice, newest first" })
  listReceipts(@Param("id", ParseUUIDPipe) id: string) {
    return this.receipts.listReceipts(id);
  }

  @Get(":id/eims/receipts/:receiptId/document")
  @BookingStaff(FREIGHT_PERMS.invoices.export)
  @ApiOperation({ summary: "Download the sealed receipt PDF (RRN + QR) for a filed EIMS receipt" })
  async receiptDocument(
    @Param("id", ParseUUIDPipe) id: string,
    @Param("receiptId", ParseUUIDPipe) receiptId: string,
    @Res() res: Response,
  ) {
    const { filename, buffer } = await this.receipts.document(id, receiptId);
    sendPdf(res, filename, buffer);
  }
}