import {
  BadRequestException,
  ForbiddenException,
  Injectable,
  NotFoundException,
} from '@nestjs/common';
import {
  CheckRegistrationMode,
  OrderStatus,
  Prisma,
  SettlementType,
} from '@prisma/client';
import { PrismaService } from '../prisma/prisma.service';
import {
  AdminCreateOrderDto,
  ChooseSettlementDto,
  SubmitOrderCheckDto,
  SubmitOrderDto,
  SubmitOrderItemDto,
  UpdateOrderChecksDto,
  UpdateOrderPricingDto,
  UpdateOrderStatusDto,
} from './dto/order.dto';
import { generateOrderNumber } from '../common/utils/order-number';
import { calculateCheckRass } from '../common/utils/check-rass';
import { earliestCashInvoiceExpiry } from '../common/utils/cash-expiry';
import {
  resolveAdminStatusFilter,
  toAdminStatus,
} from '../common/utils/order-status';
import {
  allowedTransitions,
  assertTransition,
} from '../common/utils/order-transitions';
import { resolveMaxMeterage } from '../common/utils/meterage';
import { AgentLevelService } from '../agent/agent-level.service';
import { NotificationsService } from '../notifications/notifications.service';
import { eventForStatus } from '../notifications/notification-events';
import { joinFullName, splitFullName } from '../common/utils/name';
import {
  isValidPhone,
  normalizePhone,
  toEnglishDigits,
} from '../common/utils/phone';

const orderInclude = {
  items: true,
  checks: { orderBy: { row: 'asc' as const } },
  cashReceipt: true,
  statusHistory: { orderBy: { changedAt: 'asc' as const } },
  shipment: true,
  user: true,
  company: true,
} satisfies Prisma.OrderInclude;

type OrderFull = Prisma.OrderGetPayload<{ include: typeof orderInclude }>;

/** مبالغ ریالی روی Float ذخیره می‌شوند؛ گرد کردن از انباشت خطای اعشاری جلوگیری می‌کند. */
function roundMoney(value: number): number {
  return Math.round(value * 100) / 100;
}

/** بعد از تأیید چک‌ها یا ارسال سفارش، مشتری نباید بتواند چک‌ها را بازنویسی کند. */
const CHECK_EDITABLE_STATUSES: OrderStatus[] = [
  OrderStatus.check_in_progress,
  OrderStatus.awaiting_check_review,
  OrderStatus.check_needs_fix,
  OrderStatus.check_rejected,
];

/**
 * تا وقتی ادمین فاکتور را نفرستاده، مشتری نباید هیچ مبلغی ببیند.
 * پنهان‌سازی روی خود پاسخ API انجام می‌شود، نه در کلاینت.
 */
const PRICE_HIDDEN_STATUSES: OrderStatus[] = [
  OrderStatus.awaiting_review,
  OrderStatus.pricing,
];

@Injectable()
export class OrdersService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly notifications: NotificationsService,
    private readonly agentLevelService: AgentLevelService,
  ) {}

  async findMyOrders(userId: string) {
    const orders = await this.prisma.order.findMany({
      where: { userId },
      orderBy: { createdAt: 'desc' },
      include: orderInclude,
    });
    return orders.map((o) => this.mapOrder(o));
  }

  async findMyOrder(userId: string, id: string) {
    const order = await this.getOrder(id);
    if (order.userId !== userId) {
      throw new ForbiddenException('دسترسی به این سفارش مجاز نیست');
    }
    return this.mapOrder(order);
  }

  async findAdminOrders(filters: { status?: string; q?: string }) {
    const statuses = resolveAdminStatusFilter(filters.status);
    const q = filters.q?.trim();
    const orders = await this.prisma.order.findMany({
      where: {
        ...(statuses ? { status: { in: statuses } } : {}),
        ...(q
          ? {
              OR: [
                { orderNumber: { contains: q, mode: 'insensitive' } },
                { companyName: { contains: q, mode: 'insensitive' } },
                {
                  user: {
                    OR: [
                      { firstName: { contains: q, mode: 'insensitive' } },
                      { lastName: { contains: q, mode: 'insensitive' } },
                      { phone: { contains: toEnglishDigits(q) } },
                    ],
                  },
                },
              ],
            }
          : {}),
      },
      orderBy: { createdAt: 'desc' },
      include: orderInclude,
    });
    return orders.map((o) => this.mapOrder(o, true));
  }

  async findAdminOrder(id: string) {
    const order = await this.getOrder(id);
    return this.mapOrder(order, true);
  }

  async submitOrder(userId: string, dto: SubmitOrderDto) {
    const { itemsData, totalMeterage, primaryCompany, companyNames, uniqueProductIds } =
      await this.resolveOrderLines(dto.items, dto.companyId);

    // روش تسویه و چک‌ها بعد از قیمت‌گذاری ادمین گرفته می‌شوند، نه اینجا.
    const order = await this.createWithUniqueOrderNumber((orderNumber) =>
      this.prisma.$transaction(async (tx) => {
        const created = await tx.order.create({
          data: {
            orderNumber,
            userId,
            companyId: primaryCompany.id,
            companyName: companyNames.join('، '),
            settlementType: null,
            checkMode: null,
            status: OrderStatus.awaiting_review,
            totalMeterage,
            notes: dto.notes?.trim() || null,
            items: { create: itemsData },
            statusHistory: {
              create: [
                {
                  fromStatus: null,
                  toStatus: OrderStatus.awaiting_review,
                  changedBy: 'customer',
                  note: 'سفارش ثبت شد و برای بررسی مدیریت ارسال شد',
                },
              ],
            },
          },
          include: orderInclude,
        });

        // کل اقلام ثبت‌شده از سبد حذف می‌شوند (یک فاکتور واحد)
        const cart = await tx.cart.findFirst({ where: { userId } });
        if (cart) {
          await tx.cartItem.deleteMany({
            where: {
              cartId: cart.id,
              productId: { in: uniqueProductIds },
            },
          });
          const remaining = await tx.cartItem.findFirst({
            where: { cartId: cart.id },
          });
          await tx.cart.update({
            where: { id: cart.id },
            data: { companyId: remaining?.companyId ?? null },
          });
        }

        return created;
      }),
    );

    this.notifications.dispatchOrderEvent(order.id, 'order_submitted');
    this.notifications.dispatchAdmin({
      title: 'سفارش جدید ثبت شد',
      body: `سفارش ${order.orderNumber} با ${order.items.length} قلم و ${order.totalMeterage} متر در انتظار قیمت‌گذاری است.`,
      link: `/orders/${order.id}`,
    });

    return this.mapOrder(order);
  }

  /**
   * مشتری بعد از دیدن جمع فاکتور روش تسویه را انتخاب می‌کند.
   * نقدی مستقیم به مرحله پرداخت می‌رود، چکی به مرحله ثبت چک‌ها.
   */
  async chooseSettlement(userId: string, id: string, dto: ChooseSettlementDto) {
    const order = await this.getOrder(id);
    if (order.userId !== userId) {
      throw new ForbiddenException('دسترسی به این سفارش مجاز نیست');
    }
    if (order.status !== OrderStatus.awaiting_settlement) {
      throw new BadRequestException(
        'انتخاب روش تسویه فقط پس از صدور فاکتور توسط مدیریت امکان‌پذیر است',
      );
    }

    const isCash = dto.settlementType === SettlementType.cash;
    const nextStatus = isCash
      ? OrderStatus.awaiting_cash_payment
      : OrderStatus.check_in_progress;
    assertTransition(order.status, nextStatus);

    const cashCompanies = isCash
      ? await this.companiesForOrder(order)
      : [];

    await this.prisma.$transaction(async (tx) => {
      await tx.order.update({
        where: { id },
        data: {
          settlementType: dto.settlementType,
          checkMode: isCash
            ? null
            : (dto.checkMode ?? CheckRegistrationMode.full),
          cashInvoiceExpiresAt: isCash
            ? earliestCashInvoiceExpiry(cashCompanies)
            : null,
          cashReminderSentAt: null,
          status: nextStatus,
        },
      });
      await tx.orderStatusHistory.create({
        data: {
          orderId: id,
          fromStatus: order.status,
          toStatus: nextStatus,
          changedBy: 'customer',
          note: isCash
            ? 'مشتری تسویه نقدی را انتخاب کرد'
            : 'مشتری تسویه چکی را انتخاب کرد',
        },
      });
    });

    return this.findMyOrder(userId, id);
  }

  async adminCreate(adminId: string, dto: AdminCreateOrderDto) {
    if (!dto.items?.length) {
      throw new BadRequestException(
        'حداقل یک محصول برای ثبت پیش‌سفارش لازم است',
      );
    }

    let userId = dto.customerId || dto.userId;
    if (userId) {
      const existing = await this.prisma.customer.findUnique({
        where: { id: userId },
      });
      if (!existing) {
        throw new BadRequestException('مشتری انتخاب‌شده یافت نشد');
      }
    } else if (dto.customerPhone) {
      const phone = normalizePhone(toEnglishDigits(dto.customerPhone));
      if (!isValidPhone(phone)) {
        throw new BadRequestException('شماره موبایل نامعتبر است');
      }
      let customer = await this.prisma.customer.findUnique({
        where: { phone },
      });
      if (!customer) {
        const names = splitFullName(dto.customerName || 'مشتری جدید');
        customer = await this.prisma.customer.create({
          data: {
            phone,
            firstName: names.firstName,
            lastName: names.lastName || 'جدید',
          },
        });
      }
      userId = customer.id;
    }
    if (!userId) {
      throw new BadRequestException('انتخاب مشتری الزامی است');
    }

    const { itemsData, totalMeterage, primaryCompany, companyNames } =
      await this.resolveOrderLines(dto.items, dto.companyId);

    const ownerId = userId;

    const order = await this.createWithUniqueOrderNumber((orderNumber) =>
      this.prisma.order.create({
        data: {
          orderNumber,
          userId: ownerId,
          companyId: primaryCompany.id,
          companyName: companyNames.join('، '),
          settlementType: null,
          status: OrderStatus.awaiting_review,
          totalMeterage,
          notes: dto.notes?.trim() || null,
          items: { create: itemsData },
          statusHistory: {
            create: {
              fromStatus: null,
              toStatus: OrderStatus.awaiting_review,
              changedBy: `admin:${adminId}`,
              note: 'پیش‌سفارش توسط ادمین ثبت شد',
            },
          },
        },
        include: orderInclude,
      }),
    );

    return this.mapOrder(order, true);
  }

  async updatePricing(id: string, adminId: string, dto: UpdateOrderPricingDto) {
    const order = await this.getOrder(id);
    const existingIds = new Set(order.items.map((item) => item.id));
    const deletedIds = [...new Set(dto.deletedItemIds ?? [])];

    for (const delId of deletedIds) {
      if (!existingIds.has(delId)) {
        throw new BadRequestException(`آیتم ${delId} یافت نشد`);
      }
    }

    const updates = dto.items.filter((item) => item.id && existingIds.has(item.id));
    const creates = dto.items.filter(
      (item) => item.productId && (!item.id || !existingIds.has(item.id)),
    );
    const unknown = dto.items.find(
      (item) => item.id && !existingIds.has(item.id) && !item.productId,
    );
    if (unknown?.id) {
      throw new BadRequestException(`آیتم ${unknown.id} یافت نشد`);
    }

    const createdRows: Array<{
      productId: string;
      catalogCode: string;
      productName: string;
      productCode: string;
      color: string;
      requestedMeterage: number;
      notes: string | null;
      companyId: string;
      companyName: string;
      confirmedMeterage: number;
      unitPrice: number;
      unitDiscount: number;
      lineTotal: number;
    }> = [];

    if (creates.length) {
      const resolved = await this.resolveOrderLines(
        creates.map((item) => ({
          productId: item.productId!,
          meterage:
            item.requestedMeterage ??
            item.confirmedMeterage ??
            0,
        })),
        order.companyId,
      );
      for (const [index, row] of resolved.itemsData.entries()) {
        const src = creates[index]!;
        const unitPrice = src.unitPrice ?? src.supplyPrice ?? 0;
        const unitDiscount = src.unitDiscount ?? 0;
        if (unitDiscount > unitPrice) {
          throw new BadRequestException(
            'تخفیف واحد نمی‌تواند از قیمت واحد بیشتر باشد',
          );
        }
        const confirmed = src.confirmedMeterage ?? row.requestedMeterage;
        createdRows.push({
          ...row,
          confirmedMeterage: confirmed,
          unitPrice,
          unitDiscount,
          lineTotal: roundMoney(Math.max(0, (unitPrice - unitDiscount) * confirmed)),
        });
      }
    }

    await this.prisma.$transaction(async (tx) => {
      if (deletedIds.length) {
        await tx.orderItem.deleteMany({
          where: { orderId: id, id: { in: deletedIds } },
        });
      }

      for (const existing of order.items) {
        if (deletedIds.includes(existing.id)) continue;
        const item = updates.find((entry) => entry.id === existing.id);
        if (!item) continue;

        const unitPrice =
          item.unitPrice !== undefined
            ? item.unitPrice
            : item.supplyPrice !== undefined
              ? item.supplyPrice
              : (existing.unitPrice ?? 0);
        const unitDiscount = item.unitDiscount ?? existing.unitDiscount ?? 0;
        if (unitDiscount > unitPrice) {
          throw new BadRequestException(
            'تخفیف واحد نمی‌تواند از قیمت واحد بیشتر باشد',
          );
        }
        const confirmed =
          item.confirmedMeterage ??
          existing.confirmedMeterage ??
          existing.requestedMeterage;
        await tx.orderItem.update({
          where: { id: existing.id },
          data: {
            confirmedMeterage: confirmed,
            unitPrice,
            unitDiscount,
            lineTotal: roundMoney(Math.max(0, (unitPrice - unitDiscount) * confirmed)),
          },
        });
      }

      for (const row of createdRows) {
        await tx.orderItem.create({
          data: { orderId: id, ...row },
        });
      }

      const remaining = await tx.orderItem.findMany({ where: { orderId: id } });
      if (!remaining.length) {
        throw new BadRequestException('سفارش باید حداقل یک قلم داشته باشد');
      }

      let totalAmount = 0;
      let totalMeterage = 0;
      for (const existing of remaining) {
        const unitPrice = existing.unitPrice ?? 0;
        const unitDiscount = existing.unitDiscount ?? 0;
        const confirmed =
          existing.confirmedMeterage ?? existing.requestedMeterage;
        totalAmount += roundMoney(
          Math.max(0, (unitPrice - unitDiscount) * confirmed),
        );
        totalMeterage += confirmed;
      }
      totalAmount = roundMoney(totalAmount);

      const shippingCost = dto.shippingCost ?? order.shippingCost ?? 0;
      const totalDiscount = dto.totalDiscount ?? order.totalDiscount ?? 0;
      const finalAmount = roundMoney(
        Math.max(0, totalAmount + shippingCost - totalDiscount),
      );

      const nextStatus =
        order.status === OrderStatus.awaiting_review ||
        order.status === OrderStatus.pricing
          ? OrderStatus.pricing
          : order.status;

      await tx.order.update({
        where: { id },
        data: {
          totalAmount,
          totalMeterage,
          shippingCost,
          totalDiscount,
          finalAmount,
          status: nextStatus,
        },
      });

      if (nextStatus !== order.status) {
        await tx.orderStatusHistory.create({
          data: {
            orderId: id,
            fromStatus: order.status,
            toStatus: nextStatus,
            changedBy: `admin:${adminId}`,
            note: dto.note || 'قیمت‌گذاری انجام شد',
          },
        });
      }
    });

    await this.agentLevelService.syncAgentForOrder(id);

    return this.findAdminOrder(id);
  }

  async updateStatus(id: string, adminId: string, dto: UpdateOrderStatusDto) {
    const order = await this.getOrder(id);
    if (order.status === dto.status) {
      return this.mapOrder(order, true);
    }

    if (dto.force) {
      if (!dto.reason?.trim()) {
        throw new BadRequestException(
          'برای تغییر دستی وضعیت، ذکر دلیل الزامی است',
        );
      }
    } else {
      assertTransition(order.status, dto.status);
    }

    // فاکتور بدون مبلغ نباید برای مشتری ارسال شود
    if (
      dto.status === OrderStatus.awaiting_settlement &&
      (order.finalAmount ?? 0) <= 0
    ) {
      throw new BadRequestException(
        'ابتدا سفارش را قیمت‌گذاری کنید تا فاکتور قابل ارسال باشد',
      );
    }

    const needsCashExpiry =
      (dto.status === OrderStatus.cash_invoice_issued ||
        dto.status === OrderStatus.awaiting_cash_payment) &&
      !order.cashInvoiceExpiresAt;
    const cashExpiry = needsCashExpiry
      ? earliestCashInvoiceExpiry(await this.companiesForOrder(order))
      : null;

    await this.prisma.$transaction(async (tx) => {
      await tx.order.update({
        where: { id },
        data: { status: dto.status },
      });
      await tx.orderStatusHistory.create({
        data: {
          orderId: id,
          fromStatus: order.status,
          toStatus: dto.status,
          changedBy: `admin:${adminId}`,
          note: dto.force
            ? `تغییر دستی وضعیت${dto.note ? ` — ${dto.note}` : ''}`
            : dto.note || null,
          reason: dto.reason || null,
        },
      });

      if (cashExpiry) {
        await tx.order.update({
          where: { id },
          data: { cashInvoiceExpiresAt: cashExpiry },
        });
      }
    });

    const event = eventForStatus(dto.status);
    if (event) {
      this.notifications.dispatchOrderEvent(id, event, {
        note: dto.reason ?? dto.note ?? null,
      });
    }

    return this.findAdminOrder(id);
  }

  async updateChecks(userId: string, id: string, dto: UpdateOrderChecksDto) {
    const order = await this.getOrder(id);
    if (order.userId !== userId) {
      throw new ForbiddenException('دسترسی به این سفارش مجاز نیست');
    }
    if (order.settlementType !== SettlementType.check) {
      throw new BadRequestException('این سفارش تسویه چکی نیست');
    }
    if (!CHECK_EDITABLE_STATUSES.includes(order.status)) {
      throw new BadRequestException(
        'در وضعیت فعلی سفارش امکان ویرایش چک‌ها وجود ندارد',
      );
    }

    if (!dto.checks.length) {
      throw new BadRequestException('حداقل یک چک لازم است');
    }

    const checkMode =
      dto.checkMode ?? order.checkMode ?? CheckRegistrationMode.full;
    const rass = calculateCheckRass(
      dto.checks.map((c) => ({ amount: c.amount, dueDate: c.dueDate })),
      order.createdAt,
    );

    // ثبت اولیه و اصلاح، هر دو سفارش را به صف بررسی چک می‌برند.
    const goesToReview =
      order.status === OrderStatus.check_in_progress ||
      order.status === OrderStatus.check_needs_fix ||
      order.status === OrderStatus.check_rejected;
    const nextStatus = goesToReview
      ? OrderStatus.awaiting_check_review
      : order.status;
    const isFix = order.status !== OrderStatus.check_in_progress;

    await this.prisma.$transaction(async (tx) => {
      await tx.check.deleteMany({ where: { orderId: id } });
      await tx.check.createMany({
        data: dto.checks.map((c, index) => ({
          orderId: id,
          ...this.mapCheckCreate(c, index + 1, checkMode),
        })),
      });
      await tx.order.update({
        where: { id },
        data: {
          checkMode,
          checkRassDays: rass.rassDays,
          checkRassDate: rass.rassDate ? new Date(rass.rassDate) : null,
          status: nextStatus,
        },
      });
      if (nextStatus !== order.status) {
        await tx.orderStatusHistory.create({
          data: {
            orderId: id,
            fromStatus: order.status,
            toStatus: nextStatus,
            changedBy: 'customer',
            note: isFix
              ? 'چک‌ها اصلاح و مجدداً ارسال شد'
              : 'چک‌ها برای بررسی ارسال شد',
          },
        });
      }
    });

    if (nextStatus !== order.status) {
      this.notifications.dispatchAdmin({
        title: isFix ? 'چک‌های اصلاح‌شده رسید' : 'چک‌های سفارش ثبت شد',
        body: `مشتری ${dto.checks.length} چک برای سفارش ${order.orderNumber} ثبت کرد و منتظر بررسی است.`,
        link: `/orders/${id}/checks`,
      });
    }

    return this.findMyOrder(userId, id);
  }

  private mapCheckCreate(
    c: SubmitOrderCheckDto,
    row: number,
    defaultMode: CheckRegistrationMode,
  ) {
    return {
      row,
      amount: c.amount,
      dueDate: new Date(c.dueDate),
      sayadId: c.sayadId?.trim() || null,
      checkNumber: c.checkNumber?.trim() || null,
      ownerNationalId: c.ownerNationalId?.trim() || null,
      ownerFirstName: c.ownerFirstName?.trim() || null,
      ownerLastName: c.ownerLastName?.trim() || null,
      bankName: c.bankName?.trim() || null,
      branchName: c.branchName?.trim() || null,
      frontImage: c.frontImage || null,
      backImage: c.backImage || null,
      notes: c.notes?.trim() || null,
      mode: c.mode ?? defaultMode,
    };
  }

  private async nextOrderNumber(): Promise<string> {
    for (let i = 0; i < 5; i++) {
      const orderNumber = generateOrderNumber();
      const exists = await this.prisma.order.findUnique({
        where: { orderNumber },
      });
      if (!exists) return orderNumber;
    }
    return `${generateOrderNumber()}-${Date.now().toString().slice(-3)}`;
  }

  /** بین انتخاب شماره و درج، امکان تصاحب شماره توسط درخواست هم‌زمان هست. */
  private async createWithUniqueOrderNumber<T>(
    create: (orderNumber: string) => Promise<T>,
  ): Promise<T> {
    for (let attempt = 0; ; attempt++) {
      const orderNumber = await this.nextOrderNumber();
      try {
        return await create(orderNumber);
      } catch (e) {
        const isDuplicate =
          e instanceof Prisma.PrismaClientKnownRequestError &&
          e.code === 'P2002';
        if (!isDuplicate || attempt >= 4) throw e;
      }
    }
  }

  private async companiesForOrder(order: OrderFull) {
    const companyIds = [
      ...new Set(
        [
          order.companyId,
          ...order.items.map((item) => item.companyId).filter(Boolean),
        ].filter(Boolean),
      ),
    ];
    if (!companyIds.length) return order.company ? [order.company] : [];
    const companies = await this.prisma.company.findMany({
      where: { id: { in: companyIds } },
    });
    return companies.length ? companies : order.company ? [order.company] : [];
  }

  private async resolveOrderLines(
    items: SubmitOrderItemDto[],
    preferredCompanyId?: string,
  ) {
    const settings = await this.prisma.systemSettings.findUnique({
      where: { id: 'default' },
      select: {
        maxMeteragePerInvoice: true,
        minOrderRollsPerProduct: true,
      },
    });
    const minRolls = settings?.minOrderRollsPerProduct ?? 1;

    const productIds = items.map((i) => i.productId);
    const uniqueProductIds = [...new Set(productIds)];
    if (uniqueProductIds.length !== productIds.length) {
      throw new BadRequestException('محصول تکراری در سفارش مجاز نیست');
    }

    const products = await this.prisma.product.findMany({
      where: { id: { in: uniqueProductIds } },
      include: { catalog: true, company: true },
    });
    const productMap = new Map(products.map((p) => [p.id, p]));

    for (const item of items) {
      const product = productMap.get(item.productId);
      if (!product) {
        throw new BadRequestException(
          'یک یا چند محصول نامعتبر است یا دیگر در سیستم وجود ندارد.',
        );
      }
      if (!product.isActive) {
        throw new BadRequestException(
          `محصول «${product.name}» غیرفعال است و قابل سفارش نیست`,
        );
      }
      if (!product.company?.isActive) {
        throw new BadRequestException(
          `شرکت محصول «${product.name}» غیرفعال است`,
        );
      }
    }

    const meterageByCompany = new Map<
      string,
      { name: string; meterage: number; max: number | null }
    >();
    for (const item of items) {
      const product = productMap.get(item.productId)!;
      const current = meterageByCompany.get(product.companyId);
      if (current) {
        current.meterage += item.meterage;
      } else {
        meterageByCompany.set(product.companyId, {
          name: product.company.name,
          meterage: item.meterage,
          max: product.company.maxMeteragePerInvoice,
        });
      }
    }

    for (const row of meterageByCompany.values()) {
      const maxMeterageResolved = resolveMaxMeterage(
        row.max,
        settings?.maxMeteragePerInvoice,
      );
      if (row.meterage > maxMeterageResolved) {
        throw new BadRequestException(
          `حداکثر متراژ مجاز فاکتور برای «${row.name}» برابر ${maxMeterageResolved} متر است`,
        );
      }
    }

    let totalMeterage = 0;
    const itemsData = items.map((item) => {
      const product = productMap.get(item.productId)!;
      if (item.meterage < product.minMeterage) {
        throw new BadRequestException(
          `حداقل متراژ برای ${product.name} برابر ${product.minMeterage} است`,
        );
      }
      const rem =
        Math.round((item.meterage / product.orderMultiplier) * 1000) / 1000;
      if (Math.abs(rem - Math.round(rem)) > 1e-6) {
        throw new BadRequestException(
          `متراژ ${product.name} باید مضرب ${product.orderMultiplier} باشد`,
        );
      }
      const rollMeters =
        product.rollMeters && product.rollMeters > 0
          ? product.rollMeters
          : product.minMeterage > 0
            ? product.minMeterage
            : 50;
      if (item.meterage / rollMeters + 1e-9 < minRolls) {
        throw new BadRequestException(
          `حداقل سفارش برای ${product.name} برابر ${minRolls} طاقه است`,
        );
      }
      totalMeterage += item.meterage;
      return {
        productId: product.id,
        catalogCode: product.catalog.code,
        productName: product.name,
        productCode: product.code,
        color: product.color,
        requestedMeterage: item.meterage,
        notes: item.notes?.trim() || null,
        companyId: product.companyId,
        companyName: product.company.name,
      };
    });

    const companyNames = [
      ...new Set(itemsData.map((item) => item.companyName).filter(Boolean)),
    ];
    const preferredId = itemsData.some((item) => item.companyId === preferredCompanyId)
      ? preferredCompanyId
      : itemsData[0]!.companyId;
    const primaryCompany = products.find((p) => p.companyId === preferredId)
      ?.company;
    if (!primaryCompany) {
      throw new NotFoundException('شرکت محصولات یافت نشد یا غیرفعال است');
    }

    return {
      itemsData,
      totalMeterage,
      primaryCompany,
      companyNames,
      uniqueProductIds,
    };
  }

  private async getOrder(id: string): Promise<OrderFull> {
    const order = await this.prisma.order.findUnique({
      where: { id },
      include: orderInclude,
    });
    if (!order) throw new NotFoundException('سفارش یافت نشد');
    return order;
  }

  mapOrder(order: OrderFull, adminView = false) {
    const customerName = joinFullName(
      order.user.firstName,
      order.user.lastName,
    );
    const hidePrices =
      !adminView && PRICE_HIDDEN_STATUSES.includes(order.status);
    const base = {
      id: order.id,
      orderNumber: order.orderNumber,
      userId: order.userId,
      companyId: order.companyId,
      companyName: order.companyName,
      settlementType: order.settlementType,
      settlementMethod: order.settlementType,
      checkMode: order.checkMode ?? undefined,
      status: order.status,
      adminStatus: toAdminStatus(order.status),
      allowedTransitions: adminView ? allowedTransitions(order.status) : [],
      totalMeterage: order.totalMeterage,
      meterage: order.totalMeterage,
      totalAmount: hidePrices ? null : order.totalAmount,
      shippingCost: hidePrices ? null : order.shippingCost,
      totalDiscount: hidePrices ? null : order.totalDiscount,
      finalAmount: hidePrices ? null : order.finalAmount,
      pricesVisible: !hidePrices,
      notes: order.notes ?? undefined,
      checkRassDays: order.checkRassDays ?? undefined,
      checkRassDate: order.checkRassDate?.toISOString(),
      cashInvoiceExpiresAt: order.cashInvoiceExpiresAt?.toISOString(),
      createdAt: order.createdAt.toISOString(),
      updatedAt: order.updatedAt.toISOString(),
      customerName,
      customerPhone: order.user.phone,
      customerNationalId: order.user.nationalId ?? undefined,
      customerType: order.user.customerType,
      items: order.items.map((item) => ({
        id: item.id,
        productId: item.productId ?? undefined,
        catalogCode: item.catalogCode,
        productName: item.productName,
        productCode: item.productCode ?? undefined,
        color: item.color,
        requestedMeterage: item.requestedMeterage,
        confirmedMeterage: item.confirmedMeterage,
        unitPrice: hidePrices ? null : item.unitPrice,
        supplyPrice: hidePrices ? null : item.unitPrice,
        unitDiscount: hidePrices ? null : (item.unitDiscount ?? 0),
        discount: hidePrices ? null : (item.unitDiscount ?? 0),
        lineTotal: hidePrices ? null : item.lineTotal,
        totalAmount: hidePrices ? null : item.lineTotal,
        notes: item.notes ?? undefined,
        companyId: item.companyId,
        companyName: item.companyName,
      })),
      checks: order.checks.map((c) => ({
        id: c.id,
        orderId: c.orderId,
        row: c.row,
        amount: c.amount,
        dueDate: c.dueDate.toISOString(),
        sayadId: c.sayadId ?? undefined,
        checkNumber: c.checkNumber ?? undefined,
        ownerNationalId: c.ownerNationalId ?? undefined,
        ownerFirstName: c.ownerFirstName ?? undefined,
        ownerLastName: c.ownerLastName ?? undefined,
        bankName: c.bankName ?? '',
        branchName: c.branchName ?? undefined,
        frontImage: c.frontImage ?? undefined,
        backImage: c.backImage ?? undefined,
        notes: c.notes ?? undefined,
        mode: c.mode,
        status: c.status,
        createdAt: c.createdAt.toISOString(),
        updatedAt: c.updatedAt.toISOString(),
      })),
      cashReceipt: order.cashReceipt
        ? {
            id: order.cashReceipt.id,
            amount: order.cashReceipt.amount,
            paidAmount: order.cashReceipt.paidAmount,
            transferDate: order.cashReceipt.transferDate?.toISOString() ?? null,
            transferTime: order.cashReceipt.transferTime ?? undefined,
            trackingNumber: order.cashReceipt.trackingNumber ?? undefined,
            trackingCode: order.cashReceipt.trackingNumber ?? undefined,
            destinationAccountId:
              order.cashReceipt.destinationAccountId ?? undefined,
            receiptImage: order.cashReceipt.receiptImage ?? undefined,
            notes: order.cashReceipt.notes ?? undefined,
            expiresAt:
              order.cashReceipt.expiresAt?.toISOString() ??
              order.cashInvoiceExpiresAt?.toISOString(),
            status: order.cashReceipt.status,
            submittedAt: order.cashReceipt.submittedAt?.toISOString(),
            createdAt: order.cashReceipt.createdAt.toISOString(),
          }
        : undefined,
      shipment: order.shipment
        ? {
            id: order.shipment.id,
            orderId: order.shipment.orderId,
            carrier: order.shipment.carrier,
            trackingNumber: order.shipment.trackingNumber ?? '',
            meterage: order.shipment.meterage,
            status: order.shipment.status,
            shippedAt: order.shipment.shippedAt?.toISOString() ?? null,
            deliveredAt: order.shipment.deliveredAt?.toISOString() ?? null,
          }
        : undefined,
      statusHistory: order.statusHistory.map((h) => ({
        id: h.id,
        fromStatus: h.fromStatus,
        toStatus: h.toStatus,
        changedBy: h.changedBy,
        note: h.note ?? undefined,
        reason: h.reason ?? undefined,
        changedAt: h.changedAt.toISOString(),
      })),
    };

    return base;
  }
}