import { Prisma } from '@prisma/client';
import {
  BadRequestException,
  Injectable,
  NotFoundException,
} from '@nestjs/common';
import { PrismaService } from '../../prisma/prisma.service';
import { TahesabConnectionsService } from './connections.service';
import { PushSanadDto } from './dto';
import {
  buildFactorCode,
  SanadBuilders,
} from './tahesab-methods';

function normalizeShamsiYmd(input: string): string {
  const m = /^(\d{4})-(\d{1,2})-(\d{1,2})$/.exec(input.trim());
  if (!m) {
    throw new BadRequestException(
      'تاریخ از/تا باید شمسی با قالب YYYY-MM-DD باشد.',
    );
  }
  return `${m[1]}-${m[2]!.padStart(2, '0')}-${m[3]!.padStart(2, '0')}`;
}

function asAsnadList(raw: unknown): Array<Record<string, unknown>> {
  if (!raw) return [];
  if (Array.isArray(raw)) return raw as Array<Record<string, unknown>>;
  if (typeof raw === 'object') {
    const obj = raw as Record<string, unknown>;
    for (const key of ['DoListAsnad', 'Asnad', 'asnad', 'Items', 'items', 'Data']) {
      const nested = obj[key];
      if (Array.isArray(nested)) {
        return nested.filter((v) => v && typeof v === 'object') as Array<
          Record<string, unknown>
        >;
      }
    }
    return Object.values(obj).filter(
      (v) => v && typeof v === 'object' && !Array.isArray(v),
    ) as Array<Record<string, unknown>>;
  }
  return [];
}

@Injectable()
export class TahesabDocumentsService {
  constructor(
    private readonly prisma: PrismaService,
    private readonly connections: TahesabConnectionsService,
  ) {}

  private async requireLink(
    organizationId: string,
    personId: string,
    connectionId: string,
  ) {
    const person = await this.prisma.person.findFirst({
      where: { id: personId, organizationId },
    });
    if (!person) throw new NotFoundException('شخص یافت نشد.');
    const link = await this.prisma.personAccountingLink.findFirst({
      where: { personId, connectionId },
    });
    if (!link) {
      throw new BadRequestException(
        'شخص به این اتصال ته‌حساب لینک نشده است.',
      );
    }
    return link;
  }

  async listAsnad(
    organizationId: string,
    personId: string,
    from: string,
    to: string,
    connectionId?: string,
  ) {
    const fromNorm = normalizeShamsiYmd(from);
    const toNorm = normalizeShamsiYmd(to);
    const resolvedId = await this.connections.resolveConnectionId(
      organizationId,
      connectionId,
    );
    const link = await this.requireLink(organizationId, personId, resolvedId);
    const { api } = await this.connections.getApi(organizationId, resolvedId);
    // Count_Last مثل تست‌های همکار (۲۰۰) — مقدار ۱- گاهی سمت ته‌حساب خطا/۵۰۲ می‌دهد
    const raw = await api.doListAsnad(
      200,
      link.moshtariCode,
      fromNorm,
      toNorm,
    );
    const items = asAsnadList(raw);
    return {
      connectionId: resolvedId,
      moshtariCode: link.moshtariCode,
      from: fromNorm,
      to: toNorm,
      items,
      count: items.length,
    };
  }

  async listLookups(organizationId: string, connectionId?: string) {
    const resolvedId = await this.connections.resolveConnectionId(
      organizationId,
      connectionId,
    );
    const { api } = await this.connections.getApi(organizationId, resolvedId);
    const [sekeh, arz, banks] = await Promise.all([
      api.doListNameSekeh().catch(() => []),
      api.doListNameArz().catch(() => []),
      api.doListHesabBanki().catch(() => []),
    ]);
    return { connectionId: resolvedId, sekeh, arz, banks };
  }

  async pushSanad(
    organizationId: string,
    personId: string,
    dto: PushSanadDto,
  ) {
    const link = await this.requireLink(
      organizationId,
      personId,
      dto.connectionId,
    );
    const factorCode = dto.factorCode?.trim() || buildFactorCode('crm');

    const existing = await this.prisma.accountingDocumentLog.findUnique({
      where: {
        connectionId_factorCode: {
          connectionId: dto.connectionId,
          factorCode,
        },
      },
    });
    if (existing?.status === 'success') {
      return {
        idempotent: true,
        log: this.logDto(existing),
        response: existing.responsePayload,
      };
    }

    const { api } = await this.connections.getApi(
      organizationId,
      dto.connectionId,
    );

    const code = link.moshtariCode;
    const sharh = dto.sharh ?? '';
    let docTypeApi = '';
    let args: unknown[] = [];

    switch (dto.docType) {
      case 'buy_sale_gold': {
        if (dto.vazn == null || dto.ayar == null || dto.mazaneh == null || dto.mablaghKol == null || dto.buyOrSale == null) {
          throw new BadRequestException(
            'برای خرید/فروش آبشده: vazn، ayar، mazaneh، mablaghKol، buyOrSale الزامی است.',
          );
        }
        docTypeApi = 'DoNewSanadBuySaleGOLD';
        args = SanadBuilders.buySaleGold({
          moshtariCode: code,
          year: dto.year,
          month: dto.month,
          day: dto.day,
          vazn: dto.vazn,
          ayar: dto.ayar,
          buyOrSale: dto.buyOrSale,
          mazaneh: dto.mazaneh,
          mazanehIsGeram: dto.mazanehIsGeram ?? 0,
          isAbshode: dto.isAbshode ?? 1,
          mablaghKol: dto.mablaghKol,
          sharh,
          factorCode,
          havalehBeMcode: dto.havalehBeMcode,
          jensFelez: dto.jensFelez,
        });
        break;
      }
      case 'buy_sale_sekeh': {
        if (
          dto.vazn == null ||
          dto.ayar == null ||
          dto.count == null ||
          !dto.nameSekeh ||
          dto.buyOrSale == null ||
          dto.mazaneh == null ||
          dto.mablaghKol == null
        ) {
          throw new BadRequestException(
            'برای خرید/فروش سکه فیلدهای وزن، عیار، تعداد، نام سکه، خرید/فروش، مظنه و مبلغ کل الزامی است.',
          );
        }
        docTypeApi = 'DoNewSanadBuySaleSEKEH';
        args = SanadBuilders.buySaleSekeh({
          moshtariCode: code,
          year: dto.year,
          month: dto.month,
          day: dto.day,
          vazn: dto.vazn,
          ayar: dto.ayar,
          count: dto.count,
          nameSekeh: dto.nameSekeh,
          buyOrSale: dto.buyOrSale,
          mazaneh: dto.mazaneh,
          mablaghKol: dto.mablaghKol,
          sharh,
          factorCode,
          jensFelez: dto.jensFelez,
          arzName: dto.arzName,
        });
        break;
      }
      case 'talab_bedehi': {
        if (dto.isBedehiOrTalab == null || dto.mablagh == null) {
          throw new BadRequestException(
            'برای طلب/بدهی: isBedehiOrTalab و mablagh الزامی است.',
          );
        }
        docTypeApi = 'DoNewSanadTalabBedehi';
        args = SanadBuilders.talabBedehi({
          moshtariCode: code,
          year: dto.year,
          month: dto.month,
          day: dto.day,
          isBedehiOrTalab: dto.isBedehiOrTalab,
          mablagh: dto.mablagh,
          sharh,
          baabat: dto.baabat ?? 'CRM',
          vazn: dto.vazn ?? 0,
          factorCode,
          havalehBeMcode: dto.havalehBeMcode,
          jensFelez: dto.jensFelez,
          arzName: dto.arzName,
        });
        break;
      }
      case 'vkh_gold': {
        if (
          dto.vazn == null ||
          dto.ayar == null ||
          dto.isVoroodOrKhorooj == null
        ) {
          throw new BadRequestException(
            'برای واریز/خروج طلا: vazn، ayar، isVoroodOrKhorooj الزامی است.',
          );
        }
        docTypeApi = 'DoNewSanadVKHGOLD';
        args = SanadBuilders.vkhGold({
          moshtariCode: code,
          year: dto.year,
          month: dto.month,
          day: dto.day,
          vazn: dto.vazn,
          ayar: dto.ayar,
          angNumber: dto.angNumber ?? '0',
          nameAz: dto.nameAz ?? '',
          isVoroodOrKhorooj: dto.isVoroodOrKhorooj,
          isAbshode: dto.isAbshode ?? 1,
          sharh,
          factorCode,
        });
        break;
      }
      case 'vkh_bank': {
        if (
          dto.isDaryaftOrPardakht == null ||
          dto.mablagh == null ||
          !dto.nameBank
        ) {
          throw new BadRequestException(
            'برای واریز/خروج بانکی: isDaryaftOrPardakht، mablagh و nameBank الزامی است.',
          );
        }
        docTypeApi = 'DoNewSanadVKHBank';
        args = SanadBuilders.vkhBank({
          moshtariCode: code,
          year: dto.year,
          month: dto.month,
          day: dto.day,
          isDaryaftOrPardakht: dto.isDaryaftOrPardakht,
          mablagh: dto.mablagh,
          sharh,
          nameBank: dto.nameBank,
          codeRahgiri: dto.codeRahgiri ?? '',
          factorCode,
        });
        break;
      }
      default:
        throw new BadRequestException('نوع سند نامعتبر است.');
    }

    const requestPayload = { [docTypeApi]: args } as Prisma.InputJsonValue;

    const log = existing
      ? await this.prisma.accountingDocumentLog.update({
          where: { id: existing.id },
          data: {
            docType: docTypeApi,
            requestPayload,
            status: 'pending',
            errorMessage: null,
            personId,
          },
        })
      : await this.prisma.accountingDocumentLog.create({
          data: {
            connectionId: dto.connectionId,
            personId,
            docType: docTypeApi,
            factorCode,
            requestPayload,
            status: 'pending',
          },
        });

    try {
      let response: unknown;
      switch (dto.docType) {
        case 'buy_sale_gold':
          response = await api.doNewSanadBuySaleGold(args);
          break;
        case 'buy_sale_sekeh':
          response = await api.doNewSanadBuySaleSekeh(args);
          break;
        case 'talab_bedehi':
          response = await api.doNewSanadTalabBedehi(args);
          break;
        case 'vkh_gold':
          response = await api.doNewSanadVkhGold(args);
          break;
        case 'vkh_bank':
          response = await api.doNewSanadVkhBank(args);
          break;
      }

      const resObj = (response ?? {}) as Record<string, unknown>;
      const okVal = resObj.OK ?? resObj.Factor_Code;
      if (okVal === undefined || okVal === null || okVal === '') {
        throw new BadRequestException(
          'ته‌حساب پاسخ موفق معتبر برنگرداند: ' + JSON.stringify(response),
        );
      }

      const updated = await this.prisma.accountingDocumentLog.update({
        where: { id: log.id },
        data: {
          status: 'success',
          responsePayload: response as Prisma.InputJsonValue,
          tahesabOk: String(okVal),
          tahesabFactorId:
            typeof resObj.ID === 'number' ? resObj.ID : undefined,
          errorMessage: null,
        },
      });

      return {
        idempotent: false,
        log: this.logDto(updated),
        response,
      };
    } catch (err) {
      const message = (err as Error).message ?? 'خطای ناشناخته';
      await this.prisma.accountingDocumentLog.update({
        where: { id: log.id },
        data: {
          status: 'failed',
          errorMessage: message.slice(0, 1000),
        },
      });
      throw err;
    }
  }

  private logDto(log: {
    id: string;
    connectionId: string;
    personId: string | null;
    docType: string;
    factorCode: string;
    status: string;
    tahesabOk: string | null;
    tahesabFactorId: number | null;
    errorMessage: string | null;
    createdAt: Date;
    updatedAt: Date;
  }) {
    return {
      id: log.id,
      connectionId: log.connectionId,
      personId: log.personId,
      docType: log.docType,
      factorCode: log.factorCode,
      status: log.status,
      tahesabOk: log.tahesabOk,
      tahesabFactorId: log.tahesabFactorId,
      errorMessage: log.errorMessage,
      createdAt: log.createdAt.toISOString(),
      updatedAt: log.updatedAt.toISOString(),
    };
  }
}