import {
  Body,
  Controller,
  Delete,
  Get,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  Query,
} from '@nestjs/common';
import { CurrentUser } from '@edr/api-common';
import { ApiBearerAuth, ApiOperation, ApiTags } from '@nestjs/swagger';
import type { AuthUserPayload } from '../../common/resolve-auth-user-id';
import { resolveAuthUserId } from '../../common/resolve-auth-user-id';

import { TrainSchedulingManage, TrainSchedulingView } from '../../common/booking-guards';
import { AssignBookingsDto } from './dto/assign-bookings.dto';
import { AssignUnassignedBookingDto } from './dto/assign-unassigned-booking.dto';
import { CreateContainerTrainScheduleDto } from './dto/create-container-train-schedule.dto';
import { GetEligibleBookingsDto } from './dto/get-eligible-bookings.dto';
import { GetEligibleBulkBookingsDto } from './dto/get-eligible-bulk-bookings.dto';
import { GetEligibleContainerBookingsDto } from './dto/get-eligible-container-bookings.dto';
import { PinWagonsDto } from './dto/pin-wagons.dto';
import { UpdateContainerItemDto } from './dto/update-container-item.dto';
import { PreviewBulkTrainScheduleDto } from './dto/preview-bulk-train-schedule.dto';
import { PreviewContainerTrainScheduleDto } from './dto/preview-container-train-schedule.dto';
import { PreviewTrainScheduleDto } from './dto/preview-train-schedule.dto';
import { RecordCheckpointDto } from './dto/record-checkpoint.dto';
import { AvailableLocomotivesQueryDto } from './dto/available-locomotives-query.dto';
import { BookableSchedulesQueryDto } from './dto/bookable-schedules-query.dto';
import { UpdateTrainSchedulingGlobalRulesDto } from './dto/update-train-scheduling-global-rules.dto';
import { TrainSchedulingService } from './train-scheduling.service';
import { BookingBatchService } from './booking-batch.service';

@ApiTags('train-scheduling')
@ApiBearerAuth()
@Controller('train-scheduling')
export class TrainSchedulingController {
  constructor(
    private readonly trainSchedulingService: TrainSchedulingService,
    private readonly bookingBatchService: BookingBatchService,
  ) {}

  @Get('global-rules')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get global train scheduling rules (singleton)' })
  getGlobalRules() {
    return this.trainSchedulingService.getTrainSchedulingGlobalRules();
  }

  @Patch('global-rules')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Update global train scheduling rules (singleton)' })
  updateGlobalRules(@Body() dto: UpdateTrainSchedulingGlobalRulesDto) {
    return this.trainSchedulingService.updateTrainSchedulingGlobalRules(dto);
  }

  @Get('eligible-bookings')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'List eligible bookings (container and/or bulk)' })
  getEligibleBookings(@Query() query: GetEligibleBookingsDto) {
    return this.trainSchedulingService.getEligibleBookings(query);
  }

  @Get('batch-board')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Batch monitoring board: schedules with bookings grouped by state' })
  getBatchBoard() {
    return this.bookingBatchService.getBatchBoard();
  }

  @Get('batch-board/:scheduleId')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Batch board detail for one schedule with EAT 3h windows' })
  getBatchBoardDetail(@Param('scheduleId', ParseUUIDPipe) scheduleId: string) {
    return this.bookingBatchService.getBatchBoardDetail(scheduleId);
  }

  @Get('available-locomotives')
  @TrainSchedulingView()
  @ApiOperation({
    summary: 'List AVAILABLE locomotives at the route origin yard',
  })
  getAvailableLocomotives(@Query() query: AvailableLocomotivesQueryDto) {
    return this.trainSchedulingService.getAvailableLocomotivesForRoute(query.routeId);
  }

  @Get('bookable-schedules')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'OPEN same-route schedules a new booking can target' })
  getBookableSchedules(@Query() query: BookableSchedulesQueryDto) {
    return this.trainSchedulingService.getBookableSchedules(
      query.originYardId,
      query.destinationYardId,
    );
  }

  @Get('container/eligible-bookings')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'List eligible container bookings' })
  getEligibleContainerBookings(@Query() query: GetEligibleContainerBookingsDto) {
    return this.trainSchedulingService.getEligibleContainerBookings(query);
  }

  @Get('bulk/eligible-bookings')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'List eligible bulk bookings' })
  getEligibleBulkBookings(@Query() query: GetEligibleBulkBookingsDto) {
    return this.trainSchedulingService.getEligibleBulkBookings(query);
  }

  @Post('preview')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Preview a mixed-capable train schedule' })
  previewTrainSchedule(@Body() dto: PreviewTrainScheduleDto) {
    return this.trainSchedulingService.previewTrainSchedule(dto);
  }

  @Post('container/preview')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Preview a container train schedule' })
  previewContainerTrainSchedule(@Body() dto: PreviewContainerTrainScheduleDto) {
    return this.trainSchedulingService.previewContainerTrainSchedule(dto);
  }

  @Post('bulk/preview')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Preview a bulk train schedule' })
  previewBulkTrainSchedule(@Body() dto: PreviewBulkTrainScheduleDto) {
    return this.trainSchedulingService.previewBulkTrainSchedule(dto);
  }

  @Post('container/schedules')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Create a container train schedule' })
  createContainerTrainSchedule(@Body() dto: CreateContainerTrainScheduleDto) {
    return this.trainSchedulingService.createContainerTrainSchedule(dto);
  }

  @Post('bulk/schedules')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Create a bulk train schedule' })
  createBulkTrainSchedule(@Body() dto: CreateContainerTrainScheduleDto) {
    return this.trainSchedulingService.createContainerTrainSchedule(dto);
  }

  @Post('schedules/:id/assign-bookings')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Assign bookings to a train schedule (mixed-capable)' })
  assignBookings(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: AssignBookingsDto,
  ) {
    return this.trainSchedulingService.assignBookingsToSchedule(id, dto);
  }

  @Post('container/schedules/:id/assign-bookings')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Assign container bookings to a train schedule' })
  assignContainerBookings(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: AssignBookingsDto,
  ) {
    return this.trainSchedulingService.assignBookingsToSchedule(id, dto, 'CONTAINER');
  }

  @Post('bulk/schedules/:id/assign-bookings')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Assign bulk bookings to a train schedule' })
  assignBulkBookings(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: AssignBookingsDto,
  ) {
    return this.trainSchedulingService.assignBookingsToSchedule(id, dto, 'BULK');
  }

  @Delete('schedules/:id/bookings/:bookingId')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Unassign a booking from a train schedule' })
  unassignBooking(
    @Param('id', ParseUUIDPipe) id: string,
    @Param('bookingId', ParseUUIDPipe) bookingId: string,
    @CurrentUser() user: AuthUserPayload,
  ) {
    return this.trainSchedulingService.unassignBooking(id, bookingId, resolveAuthUserId(user));
  }

  @Delete('schedules/:id/wagons/:trainSetWagonId')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Remove an empty wagon slot from a train' })
  removeWagonSlot(
    @Param('id', ParseUUIDPipe) id: string,
    @Param('trainSetWagonId', ParseUUIDPipe) trainSetWagonId: string,
  ) {
    return this.trainSchedulingService.removeTrainSetWagonSlot(id, trainSetWagonId);
  }

  @Patch('schedules/:id/container-items/:itemId')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Update a container number on a wagon slot' })
  updateContainerItem(
    @Param('id', ParseUUIDPipe) id: string,
    @Param('itemId', ParseUUIDPipe) itemId: string,
    @Body() dto: UpdateContainerItemDto,
  ) {
    return this.trainSchedulingService.updateContainerItem(id, itemId, dto);
  }

  @Get('schedules/:id/unassigned-bookings')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get unassigned bookings for a schedule' })
  getUnassignedBookings(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.getUnassignedBookings(id);
  }

  @Post('schedules/:id/assign-unassigned-booking')
  @TrainSchedulingManage()
  @ApiOperation({
    summary: 'Assign one linked unallocated booking to wagons (preserves existing assignments)',
  })
  assignUnassignedBooking(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: AssignUnassignedBookingDto,
  ) {
    return this.trainSchedulingService.assignUnassignedBookingToWagons(id, dto.bookingId);
  }

  @Get('schedules/:id/composition-removals')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get removal log for a schedule' })
  getCompositionRemovals(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.getCompositionRemovals(id);
  }

  @Post('schedules/:id/pin-wagons')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Pin physical wagons to train set slots' })
  pinWagons(@Param('id', ParseUUIDPipe) id: string, @Body() dto: PinWagonsDto) {
    return this.trainSchedulingService.pinWagons(id, dto);
  }

  @Post('schedules/:id/finalize')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Finalize a draft train schedule' })
  finalizeSchedule(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.finalizeSchedule(id);
  }

  @Post('schedules/:id/dispatch')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Dispatch a scheduled train' })
  dispatchSchedule(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.dispatchSchedule(id);
  }

  // ---- batch / booking-window staff actions ----

  @Post('schedules/:id/run-batch')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Manually run the batch fill for a schedule' })
  async runBatch(@Param('id', ParseUUIDPipe) id: string) {
    await this.bookingBatchService.fillSchedule(id);
    return this.bookingBatchService.getBatchBoardDetail(id);
  }

  @Post('schedules/:id/run-allocation')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Run wagon-level allocation for all eligible linked bookings' })
  async runAllocation(@Param('id', ParseUUIDPipe) id: string) {
    return this.bookingBatchService.runWagonAllocation(id);
  }

  @Patch('schedules/:id/booking-window')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Open or close a schedule booking window' })
  async setBookingWindow(
    @Param('id', ParseUUIDPipe) id: string,
    @Body('status') status: 'OPEN' | 'CLOSED',
  ) {
    await this.trainSchedulingService.setBookingWindow(id, status === 'CLOSED' ? 'CLOSED' : 'OPEN');
    return this.trainSchedulingService.getContainerTrainScheduleById(id);
  }

  @Post('bookings/:bookingId/mark-paid')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Staff: mark a reserved booking paid and allocate it now' })
  async markBookingPaid(@Param('bookingId', ParseUUIDPipe) bookingId: string) {
    await this.bookingBatchService.markPaid(bookingId);
    return { ok: true };
  }

  @Post('bookings/:bookingId/expire')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Staff: expire a reservation and free its capacity' })
  async expireBooking(@Param('bookingId', ParseUUIDPipe) bookingId: string) {
    await this.bookingBatchService.expireReservation(bookingId);
    return { ok: true };
  }

  @Post('bookings/:bookingId/move-schedule')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Re-point a booking to another OPEN same-route schedule' })
  async moveBookingSchedule(
    @Param('bookingId', ParseUUIDPipe) bookingId: string,
    @Body('trainScheduleId', ParseUUIDPipe) trainScheduleId: string,
  ) {
    await this.bookingBatchService.moveToSchedule(bookingId, trainScheduleId);
    return { ok: true };
  }

  @Get('schedules/:id/checkpoints')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get the tracking corridor + logged checkpoints for a train' })
  getScheduleCheckpoints(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.getScheduleCheckpoints(id);
  }

  @Post('schedules/:id/checkpoints')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Log the train passing a station (final station triggers arrival)' })
  recordCheckpoint(
    @Param('id', ParseUUIDPipe) id: string,
    @Body() dto: RecordCheckpointDto,
  ) {
    return this.trainSchedulingService.recordCheckpoint(id, dto);
  }

  @Post('schedules/:id/arrive')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Mark a dispatched train arrived (move assets to destination yard, free assets)' })
  arriveSchedule(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.arriveSchedule(id);
  }

  @Get('container/schedules')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'List container train schedules' })
  getContainerTrainSchedules() {
    return this.trainSchedulingService.getContainerTrainSchedules();
  }

  @Get('bulk/schedules')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'List bulk train schedules' })
  getBulkTrainSchedules() {
    return this.trainSchedulingService.getContainerTrainSchedules();
  }

  @Get('container/schedules/:id')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get container train schedule detail' })
  getContainerTrainScheduleById(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.getContainerTrainScheduleById(id);
  }

  @Get('bulk/schedules/:id')
  @TrainSchedulingView()
  @ApiOperation({ summary: 'Get bulk train schedule detail' })
  getBulkTrainScheduleById(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.getContainerTrainScheduleById(id);
  }

  @Post('container/schedules/:id/cancel')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Cancel container train schedule' })
  cancelTrainSchedule(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.cancelTrainSchedule(id);
  }

  @Post('bulk/schedules/:id/cancel')
  @TrainSchedulingManage()
  @ApiOperation({ summary: 'Cancel bulk train schedule' })
  cancelBulkTrainSchedule(@Param('id', ParseUUIDPipe) id: string) {
    return this.trainSchedulingService.cancelTrainSchedule(id);
  }
}