import {
  BadRequestException,
  Body,
  Controller,
  Delete,
  Get,
  Param,
  ParseUUIDPipe,
  Patch,
  Post,
  Query,
} from '@nestjs/common';
import { ApiBearerAuth, ApiOperation, ApiTags } from '@nestjs/swagger';

import { BookingStaff } from '../../common/booking-guards';
import { FREIGHT_PERMS } from '../../seed/freight-permissions.registry';
import {
  CreateWarehouseZoneStackDto,
  UpdateWarehouseZoneSlotDto,
  UpdateWarehouseZoneStackDto,
} from './dto/warehouse-zone-stack.dto';
import { WarehouseZoneStacksService } from './warehouse-zone-stacks.service';

/**
 * Stacks and slots are zone configuration, so they ride the warehouse-zone
 * permissions rather than introducing new keys — a new key needs a matching
 * `iam.permissions` row in every environment or boot fails.
 */
@ApiTags('warehouse-zone-stacks')
@ApiBearerAuth()
@Controller('warehouse-zone-stacks')
// Class gate lists every key its routes use: Nest runs class AND method guards.
@BookingStaff([
  FREIGHT_PERMS.warehouseZones.view,
  FREIGHT_PERMS.warehouseInventory.view,
  FREIGHT_PERMS.warehouseZones.create,
  FREIGHT_PERMS.warehouseZones.update,
  FREIGHT_PERMS.warehouseZones.delete,
])
export class WarehouseZoneStacksController {
  constructor(private readonly stacksService: WarehouseZoneStacksService) {}

  @Get()
  @ApiOperation({ summary: 'List the ground stacks configured in a zone' })
  findByZone(@Query('zoneId', ParseUUIDPipe) zoneId: string) {
    return this.stacksService.findByZone(zoneId);
  }

  @Post()
  @BookingStaff(FREIGHT_PERMS.warehouseZones.create)
  @ApiOperation({
    summary: 'Create a ground stack',
    description: 'One slot per level is generated automatically, from 1 to maxStackHeight (default 3).',
  })
  create(@Body() dto: CreateWarehouseZoneStackDto, @Query('zoneId') zoneIdQuery?: string) {
    const zoneId = dto.zoneId ?? zoneIdQuery;
    if (!zoneId) {
      throw new BadRequestException('zoneId is required');
    }
    return this.stacksService.create(zoneId, dto);
  }

  // Declared before ':id' so 'slots' is never swallowed as a stack id.
  @Patch('slots/:slotId')
  @BookingStaff(FREIGHT_PERMS.warehouseZones.update)
  @ApiOperation({
    summary: 'Block, reserve, or reactivate one slot',
    description: 'Occupancy is derived from inventory and cannot be set here.',
  })
  updateSlot(@Param('slotId', ParseUUIDPipe) slotId: string, @Body() dto: UpdateWarehouseZoneSlotDto) {
    return this.stacksService.updateSlot(slotId, dto);
  }

  @Get(':id')
  @ApiOperation({ summary: 'Get one stack with its slots' })
  findOne(@Param('id', ParseUUIDPipe) id: string) {
    return this.stacksService.findById(id);
  }

  @Get(':id/occupancy')
  @ApiOperation({ summary: 'Level-by-level occupancy of one stack' })
  occupancy(@Param('id', ParseUUIDPipe) id: string) {
    return this.stacksService.slotOccupancy(id);
  }

  @Patch(':id')
  @BookingStaff(FREIGHT_PERMS.warehouseZones.update)
  @ApiOperation({
    summary: 'Update a stack',
    description: 'Raising maxStackHeight adds slots; lowering it trims the empty top levels.',
  })
  update(@Param('id', ParseUUIDPipe) id: string, @Body() dto: UpdateWarehouseZoneStackDto) {
    return this.stacksService.update(id, dto);
  }

  @Delete(':id')
  @BookingStaff(FREIGHT_PERMS.warehouseZones.delete)
  @ApiOperation({ summary: 'Delete a stack', description: 'Refused while containers still stand in it.' })
  remove(@Param('id', ParseUUIDPipe) id: string) {
    return this.stacksService.remove(id);
  }
}