import {
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  NotFoundException,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  UploadedFile,
  UseInterceptors,
} from '@nestjs/common';
import { CurrentUser } from '@edr/api-common';
import type { TCurrentUser } from '@tria-plc/api-common/modules/auth/types/current-user.type';
import { FileInterceptor } from '@nestjs/platform-express';
import { ApiBearerAuth, ApiConsumes, ApiOperation, ApiTags } from '@nestjs/swagger';

import { actorLabel } from '../warehouses/current-actor.util';
import { BookingStaff, MixedAudience } from '../../common/booking-guards';
import { FREIGHT_PERMS } from '../../seed/freight-permissions.registry';
import { hasFreightPermission } from '../../common/freight-permission.util';
import { resolveAuthUserId } from '../../common/resolve-auth-user-id';
import { BookingsService } from '../bookings/bookings.service';

import {
  GlExchangeService,
  type GlExchangeActor,
  type GlExchangeSide,
} from './gl-exchange.service';

/** Either GL desk may read and post; ownership decides who may edit. */
const GL_EXCHANGE_PERMS = [
  FREIGHT_PERMS.contracts.clearanceEtActions,
  FREIGHT_PERMS.contracts.clearanceDjActions,
];

/** Multipart bodies arrive as strings — "true"/"1" mean checked. */
const asBool = (raw: string | boolean | undefined): boolean =>
  raw === true || raw === 'true' || raw === '1';

@ApiTags('gl-exchange')
@ApiBearerAuth()
@Controller('gl-exchange')
export class GlExchangeController {
  constructor(
    private readonly exchangeService: GlExchangeService,
    private readonly bookingsService: BookingsService,
  ) {}

  // Read opened to the transit agent assigned to the shipment; the POST/PATCH/
  // DELETE below stay staff-only, so an agent can read the desks' thread but
  // never post to it.
  @Get(':entityId')
  @MixedAudience(GL_EXCHANGE_PERMS)
  @ApiOperation({
    summary: 'GL ET ↔ GL DJ shared documents for a booking or contract',
  })
  async list(
    @Param('entityId', ParseUUIDPipe) entityId: string,
    @CurrentUser() user: TCurrentUser,
  ) {
    const isStaff = GL_EXCHANGE_PERMS.some((p) =>
      hasFreightPermission(user, p),
    );
    if (
      !isStaff &&
      !(await this.bookingsService.isTransitAgentForBooking(
        user?.id,
        entityId,
      ))
    ) {
      throw new NotFoundException(`Entity ${entityId} not found`);
    }
    return this.exchangeService.list(entityId, resolveAuthUserId(user));
  }

  // Open to the transit agent assigned to the shipment as well as both desks:
  // the officer on the ground is often the one holding the scan either desk
  // needs. Their post is attributed to the TRANSIT side, never to a desk.
  @Post(':entityId')
  @MixedAudience(GL_EXCHANGE_PERMS)
  @UseInterceptors(FileInterceptor('file'))
  @ApiConsumes('multipart/form-data')
  @ApiOperation({
    summary: 'Share a document with the GL desks (either desk, or the assigned transit agent)',
  })
  async upload(
    @Param('entityId', ParseUUIDPipe) entityId: string,
    @UploadedFile() file: Express.Multer.File | undefined,
    @Body('title') title: string,
    @Body('visibleToCustomer') visibleToCustomer: string | undefined,
    @CurrentUser() user: TCurrentUser,
  ) {
    const actor = await this.resolveActor(entityId, user);
    return this.exchangeService.upload(
      entityId,
      file,
      { title, visibleToCustomer: asBool(visibleToCustomer) },
      actor,
    );
  }

  @Patch('documents/:documentId')
  @BookingStaff(GL_EXCHANGE_PERMS)
  @UseInterceptors(FileInterceptor('file'))
  @ApiConsumes('multipart/form-data')
  @ApiOperation({
    summary: 'Uploader edits a shared document (title, visibility, file)',
  })
  update(
    @Param('documentId', ParseUUIDPipe) documentId: string,
    @UploadedFile() file: Express.Multer.File | undefined,
    @Body('title') title: string | undefined,
    @Body('visibleToCustomer') visibleToCustomer: string | undefined,
    @CurrentUser() user: TCurrentUser,
  ) {
    return this.exchangeService.update(
      documentId,
      {
        title,
        visibleToCustomer:
          visibleToCustomer == null ? undefined : asBool(visibleToCustomer),
      },
      file,
      resolveAuthUserId(user),
    );
  }

  @Delete('documents/:documentId')
  @BookingStaff(GL_EXCHANGE_PERMS)
  @HttpCode(204)
  @ApiOperation({ summary: 'Uploader removes a shared document' })
  async remove(
    @Param('documentId', ParseUUIDPipe) documentId: string,
    @CurrentUser() user: TCurrentUser,
  ) {
    await this.exchangeService.remove(documentId, resolveAuthUserId(user));
  }

  /**
   * Which desk is posting. A user holding only the Djibouti actions permission
   * is Djibouti; everyone else (GL Ethiopia, and super admins who hold both)
   * posts as Ethiopia.
   */
  /**
   * Who is posting, for a route both desks and the assigned transit agent may
   * call. Staff keep the desk attribution below; a portal caller must be the
   * agent assigned to this shipment and posts as TRANSIT, so a document is
   * never credited to a desk that did not send it.
   */
  private async resolveActor(
    entityId: string,
    user: TCurrentUser,
  ): Promise<GlExchangeActor> {
    const isStaff = GL_EXCHANGE_PERMS.some((p) =>
      hasFreightPermission(user, p),
    );
    if (isStaff) return this.actor(user);

    if (
      !(await this.bookingsService.isTransitAgentForBooking(
        user?.id,
        entityId,
      ))
    ) {
      throw new NotFoundException(`Entity ${entityId} not found`);
    }
    return {
      userId: resolveAuthUserId(user),
      name: actorLabel(user) ?? null,
      side: 'TRANSIT',
    };
  }

  private actor(user: TCurrentUser): GlExchangeActor {
    const side: GlExchangeSide =
      !hasFreightPermission(user, FREIGHT_PERMS.contracts.clearanceEtActions) &&
      hasFreightPermission(user, FREIGHT_PERMS.contracts.clearanceDjActions)
        ? 'DJ'
        : 'ET';
    return {
      userId: resolveAuthUserId(user),
      name: actorLabel(user) ?? null,
      side,
    };
  }
}