import {
  Body,
  Controller,
  Delete,
  Get,
  HttpCode,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  Query,
  Request,
  UploadedFiles,
  UseInterceptors,
} from "@nestjs/common";
import { AnyFilesInterceptor } from "@nestjs/platform-express";
import {
  ApiBearerAuth,
  ApiBody,
  ApiConsumes,
  ApiOkResponse,
  ApiOperation,
  ApiTags,
} from "@nestjs/swagger";

import { BookingReferenceDataService } from "./booking-reference-data.service";
import { BookingsService } from "./bookings.service";
import { BookingReferenceDataDto } from "./dto/booking-reference-data.dto";
import { CreateBookingDto } from "./dto/create-booking.dto";
import { FilterBookingDto } from "./dto/filter-booking.dto";
import { UpdateBookingDto } from "./dto/update-booking.dto";
import { UpdateStatusDto } from "./dto/update-status.dto";

@ApiTags("bookings")
@Controller("bookings")
@ApiBearerAuth()
export class BookingsController {
  constructor(
    private readonly bookingsService: BookingsService,
    private readonly bookingReferenceDataService: BookingReferenceDataService,
  ) {}

  // ── 1. Create booking (multipart/form-data) ──────────────────────────
  @Post()
  @UseInterceptors(AnyFilesInterceptor())
  @ApiConsumes("multipart/form-data")
  @ApiOperation({
    summary: "Create a new freight booking",
    description:
      "Accepts all booking fields as form fields + dynamic file keys (e.g. passport, license). " +
      "Auto-enables consolidation when container quantity does not fill a whole wagon; attempts partner match or PENDING_CONSOLIDATION.",
  })
  @ApiBody({
    description:
      "Booking form data. Attach files with any field name (e.g. passport, tin_certificate). " +
      "Each uploaded file is saved as a row in the files table (resource=bookings).",
    type: CreateBookingDto,
  })
  create(
    @Body() dto: CreateBookingDto,
    @UploadedFiles() files: Express.Multer.File[],
    @Request() req: any,
  ) {
    console.log(
      "[BookingsController] Files received:",
      files?.length,
      files?.map((f) => ({
        fieldname: f.fieldname,
        originalname: f.originalname,
        size: f.size,
        mimetype: f.mimetype,
      })),
    );
    const userId: string | undefined = req.user?.id ?? req.user?.sub;
    return this.bookingsService.create(dto, files ?? [], userId);
  }

  // ── 2. Update draft booking (multipart/form-data) ─────────────────────
  @Patch(":id")
  @UseInterceptors(AnyFilesInterceptor())
  @ApiConsumes("multipart/form-data")
  @ApiOperation({
    summary: "Update a draft booking",
    description:
      "Only DRAFT bookings can be updated. New files are merged into existing documents.",
  })
  @ApiBody({ type: UpdateBookingDto })
  update(
    @Param("id", ParseUUIDPipe) id: string,
    @Body() dto: UpdateBookingDto,
    @UploadedFiles() files: Express.Multer.File[],
  ) {
    return this.bookingsService.update(id, dto, files ?? []);
  }

  // ── 3. List bookings (paginated + filtered) ───────────────────────────
  @Get()
  @ApiOperation({
    summary: "List freight bookings (paginated)",
    description:
      "Filter by status, customerId, contractType, serviceTypeId, cargoTypeId, tradeDirection, " +
      "paymentCurrency, allowConsolidation, consolidationPaired. " +
      "Sort by createdAt or priorityScore.",
  })
  findAll(@Query() filter: FilterBookingDto) {
    return this.bookingsService.findAll(filter);
  }

  // ── Booking form catalog (must be before :id) ─────────────────────────
  @Get("reference-data")
  @ApiOperation({
    summary: "Booking form catalog",
    description:
      "Returns yards, container types (grouped by size), service types, shipping lines, " +
      "and hierarchical cargo types for the booking UI in a single payload.",
  })
  @ApiOkResponse({ type: BookingReferenceDataDto })
  getReferenceData(): Promise<BookingReferenceDataDto> {
    return this.bookingReferenceDataService.getReferenceData();
  }

  // ── 5. Lookup by reference (must be before :id to avoid conflict) ─────
  @Get("by-reference/:reference")
  @ApiOperation({
    summary: "Get a freight booking by reference number",
    description: "Lookup booking by its human-readable reference string.",
  })
  findByReference(@Param("reference") reference: string) {
    return this.bookingsService.findByReference(reference);
  }

  // ── 4. Get single booking by ID ───────────────────────────────────────
  @Get(":id")
  @ApiOperation({ summary: "Get a freight booking by ID" })
  findOne(@Param("id", ParseUUIDPipe) id: string) {
    return this.bookingsService.findById(id);
  }

  // ── 6. Soft-delete (DRAFT only) ───────────────────────────────────────
  @Delete(":id")
  @HttpCode(204)
  @ApiOperation({
    summary: "Soft-delete a freight booking",
    description: "Only DRAFT bookings can be deleted.",
  })
  remove(@Param("id", ParseUUIDPipe) id: string) {
    return this.bookingsService.remove(id);
  }

  // ── 7. Unified status transition ──────────────────────────────────────
  @Patch(":id/status")
  @ApiOperation({
    summary: "Transition booking status",
    description:
      "Unified endpoint for all status transitions. Actions: " +
      "SUBMIT, APPROVE_STAFF, APPROVE_DIRECTOR, APPROVE_CEO, REJECT, CANCEL, ACTIVATE, EXPIRE. " +
      "Approval routing: Standard → LINE_STAFF → DIRECTOR → SIGNED. " +
      "Bulk/high-volume → DIRECTOR → CEO → SIGNED.",
  })
  updateStatus(
    @Param("id", ParseUUIDPipe) id: string,
    @Body() dto: UpdateStatusDto,
  ) {
    return this.bookingsService.updateStatus(id, dto);
  }

  // ── 8. Request or auto-pair consolidation ─────────────────────────────
  @Post(":id/consolidation")
  @ApiOperation({
    summary: "Request freight consolidation",
    description:
      "Searches for a partner whose container quantity complements yours to fill whole wagon(s) " +
      "(same route, same container type). Pairs on match or sets PENDING_CONSOLIDATION with a status message.",
  })
  requestConsolidation(@Param("id", ParseUUIDPipe) id: string) {
    return this.bookingsService.requestConsolidation(id);
  }

  // ── 9. Remove consolidation pairing ───────────────────────────────────
  @Delete(":id/consolidation")
  @ApiOperation({
    summary: "Remove consolidation pairing",
    description:
      "Unpairs both bookings and returns them to PENDING_CONSOLIDATION status.",
  })
  removeConsolidation(@Param("id", ParseUUIDPipe) id: string) {
    return this.bookingsService.removeConsolidation(id);
  }

  // ── 10. Get consolidation details ─────────────────────────────────────
  @Get(":id/consolidation")
  @ApiOperation({
    summary: "Get consolidation details",
    description:
      "Returns partner booking details and split billing information.",
  })
  getConsolidationDetails(@Param("id", ParseUUIDPipe) id: string) {
    return this.bookingsService.getConsolidationDetails(id);
  }

}