// src/modules/host/services/host.service.ts
import { Injectable } from '@nestjs/common';
import { PrismaService } from '../../../common/database/prisma.service';
import { AddPaymentDetailsDTO, CreateHostDto, UpdateHostDto } from '../dto/host.dto';
import * as bcrypt from 'bcryptjs';
import ApiError from '../../../common/utils/helper/ApiError';
import { User } from '@prisma/client';
import { z } from 'zod';
import { hostCompanyDetailsSchema } from '@/common/utils/validation/host/hostCompanyDetails.validation';
import { HOST_STATUS_DISPLAY, HOST_STATUS_INTERNAL, STEPPER } from '@/common/utils/constants/host.constant';
import { MINGLAR_STATUS_DISPLAY, MINGLAR_STATUS_INTERNAL } from '@/common/utils/constants/minglar.constant';
import { ROLE } from '@/common/utils/constants/common.constant';

type HostCompanyDetailsInput = z.infer<typeof hostCompanyDetailsSchema>;

// Document input after S3 upload (with S3 URL as filePath)
interface HostDocumentInput {
  documentTypeXid: number;
  documentName: string;
  filePath: string; // S3 URL
}

@Injectable()
export class HostService {
  constructor(private prisma: PrismaService) { }

  async createHost(data: CreateHostDto) {
    return this.prisma.user.create({ data });
  }

  async getAllHosts() {
    return this.prisma.user.findMany({ where: { roleXid: 3 } });
  }

  async getHostIdByUserXid(user_xid: number) {
    const host = await this.prisma.hostHeader.findFirst({
      where: { userXid: user_xid },
      select: { id: true, companyName: true, countryXid: true, stepper: true },
    });
    return host;
  }

  async getHostById(id: number) {
    const host = await this.prisma.hostHeader.findFirst({
      where: { userXid: id },
      include: {
        hostParent: true,
        HostBankDetails: true,
        HostDocuments: true,
        HostSuggestion: true,
        HostTrack: true,
      }
    });

    if (!host) {
      throw new ApiError(404, 'Host record not found.');
    }

    return host;
  }

  async updateHost(id: number, data: UpdateHostDto) {
    return this.prisma.user.update({
      where: { id },
      data,
    });
  }

  async deleteHost(id: number) {
    return this.prisma.user.delete({ where: { id } });
  }

  async getHostByEmail(email: string): Promise<User> {
    return this.prisma.user.findUnique({ where: { emailAddress: email } });
  }

  async verifyHostOtp(email: string, otp: string): Promise<boolean> {
    const user = await this.prisma.user.findUnique({
      where: { emailAddress: email },
      select: {
        id: true,
        emailAddress: true,
        UserOtp: {
          where: { isActive: true, isVerified: false },
          orderBy: { createdAt: 'desc' },
          take: 1,
        },
      },
    });

    if (!user) {
      throw new ApiError(404, 'User not found.');
    }

    const userOtp = user.UserOtp[0];

    if (!userOtp) {
      throw new ApiError(400, 'No OTP found.');
    }

    if (new Date() > userOtp.expiresOn) {
      throw new ApiError(400, 'OTP has expired.');
    }

    const isMatch = await bcrypt.compare(otp, userOtp.otpCode);

    if (!isMatch) {
      throw new ApiError(400, 'Invalid OTP.');
    }

    await this.prisma.userOtp.update({
      where: { id: userOtp.id },
      data: {
        isVerified: true,
        verifiedOn: new Date(),
        isActive: false,
      },
    });

    return true;
  }

  async loginForHost(emailAddress: string, userPassword: string) {
    const existingUser = await this.prisma.user.findUnique({
      where: { emailAddress: emailAddress },
    });

    if (!existingUser) {
      throw new ApiError(404, 'User not found');
    }

    if (existingUser.roleXid !== 4) {
      throw new ApiError(403, 'Access denied. Not a host user.');
    }

    const matchPassword = await bcrypt.compare(userPassword, existingUser.userPassword);
    if (!matchPassword) {
      throw new ApiError(401, 'Invalid credentials');
    }

    return existingUser;
  }

  async createMinglarUser(email: string) {
    const newUser = await this.prisma.user.create({
      data: { emailAddress: email, roleXid: ROLE.HOST },
    });
    return newUser;
  }

  async createPassword(user_xid: number, password: string): Promise<boolean> {
    // Find user by id
    const user = await this.prisma.user.findUnique({
      where: { id: user_xid },
      select: { id: true, emailAddress: true, userPassword: true },
    });

    if (!user) {
      throw new ApiError(404, 'User not found');
    }

    // Check if password already exists
    if (user.userPassword) {
      throw new ApiError(400, 'Password already exists. Use update password instead.');
    }

    // Hash the password
    const saltRounds = parseInt(process.env.SALT_ROUNDS || '10', 10);
    const hashedPassword = await bcrypt.hash(password, saltRounds);

    // Update user with hashed password
    await this.prisma.user.update({
      where: { id: user.id },
      data: { userPassword: hashedPassword },
    });

    return true;
  }

  async addPaymentDetails(data: AddPaymentDetailsDTO): Promise<AddPaymentDetailsDTO> {
    const addedPaymentDetails = await this.prisma.hostBankDetails.create({
      data,
    });

    if (!addedPaymentDetails) {
      throw new ApiError(400, 'Failed to add payment details');
    }

    return addedPaymentDetails;
  }

  async addOrUpdateCompanyDetails(
    user_xid: number,
    companyData: HostCompanyDetailsInput,
    documents: HostDocumentInput[],
    parentCompanyData?: any | null,
    parentDocuments?: HostDocumentInput[]
  ) {
    return await this.prisma.$transaction(async (tx) => {
      // Check if host already has a company
      const existingHostCompany = await tx.hostHeader.findFirst({
        where: { userXid: user_xid },
        include: { hostParent: true },
      });

      // CREATE
      if (!existingHostCompany) {
        // Optionally check unique registration number
        const existingByReg = await tx.hostHeader.findFirst({
          where: { registrationNumber: companyData.registrationNumber },
        });
        if (existingByReg) throw new ApiError(400, 'Company already exists with this registration number');

        const refNumber = await this.generateHostRefNumber(tx);

        const createdHost = await tx.hostHeader.create({
          data: {
            userXid: user_xid,
            companyName: companyData.companyName,
            hostRefNumber: refNumber,
            address1: companyData.address1,
            address2: companyData.address2,
            cityXid: companyData.cityXid,
            stateXid: companyData.stateXid,
            countryXid: companyData.countryXid,
            pinCode: companyData.pinCode,
            logoPath: companyData.logoPath || null,
            isSubsidairy: companyData.isSubsidairy,
            registrationNumber: companyData.registrationNumber,
            panNumber: companyData.panNumber,
            gstNumber: companyData.gstNumber || null,
            formationDate: new Date(companyData.formationDate),
            companyType: companyData.companyType,
            websiteUrl: companyData.websiteUrl || null,
            instagramUrl: companyData.instagramUrl || null,
            facebookUrl: companyData.facebookUrl || null,
            linkedinUrl: companyData.linkedinUrl || null,
            twitterUrl: companyData.twitterUrl || null,
            currencyXid: companyData.currencyXid,
            stepper: STEPPER.UNDER_REVIEW,
            hostStatusInternal: HOST_STATUS_INTERNAL.HOST_SUBMITTED,
            hostStatusDisplay: HOST_STATUS_DISPLAY.UNDER_REVIEW,
            adminStatusInternal: MINGLAR_STATUS_INTERNAL.ADMIN_TO_REVIEW,
            adminStatusDisplay: MINGLAR_STATUS_DISPLAY.NEW,
          },
        });

        // Create host documents
        if (documents?.length) {
          const docsData = documents.map((doc) => ({
            hostXid: createdHost.id,
            documentTypeXid: doc.documentTypeXid,
            documentName: doc.documentName,
            filePath: doc.filePath,
          }));
          await tx.hostDocuments.createMany({ data: docsData });
        }

        // Parent company and its docs (if present)
        if (companyData.isSubsidairy && parentCompanyData) {
          const createdParent = await tx.hostParent.create({
            data: {
              hostXid: createdHost.id,
              companyName: parentCompanyData.companyName,
              address1: parentCompanyData.address1,
              address2: parentCompanyData.address2 || null,
              cityXid: parentCompanyData.cityXid,
              stateXid: parentCompanyData.stateXid,
              countryXid: parentCompanyData.countryXid,
              pinCode: parentCompanyData.pinCode,
              logoPath: parentCompanyData.logoPath || null,
              isSubsidairy: false,
              registrationNumber: parentCompanyData.registrationNumber,
              panNumber: parentCompanyData.panNumber,
              gstNumber: parentCompanyData.gstNumber || null,
              formationDate: new Date(parentCompanyData.formationDate),
              companyType: parentCompanyData.companyType,
              websiteUrl: parentCompanyData.websiteUrl || null,
              instagramUrl: parentCompanyData.instagramUrl || null,
              facebookUrl: parentCompanyData.facebookUrl || null,
              linkedinUrl: parentCompanyData.linkedinUrl || null,
              twitterUrl: parentCompanyData.twitterUrl || null,
            },
          });

          if (parentDocuments?.length) {
            const parentDocsData = parentDocuments.map((doc) => ({
              hostParentXid: createdParent.id,
              documentTypeXid: doc.documentTypeXid,
              documentName: doc.documentName,
              filePath: doc.filePath,
            }));
            await tx.hostParenetDocuments.createMany({ data: parentDocsData });
          }
        }

        return createdHost;
      }

      // UPDATE existing
      // Prevent changing hostRefNumber
      const updatedHost = await tx.hostHeader.update({
        where: { id: existingHostCompany.id },
        data: {
          companyName: companyData.companyName,
          address1: companyData.address1,
          address2: companyData.address2,
          cityXid: companyData.cityXid,
          stateXid: companyData.stateXid,
          countryXid: companyData.countryXid,
          pinCode: companyData.pinCode,
          logoPath: companyData.logoPath || null,
          isSubsidairy: companyData.isSubsidairy,
          registrationNumber: companyData.registrationNumber,
          panNumber: companyData.panNumber,
          gstNumber: companyData.gstNumber || null,
          formationDate: new Date(companyData.formationDate),
          companyType: companyData.companyType,
          websiteUrl: companyData.websiteUrl || null,
          instagramUrl: companyData.instagramUrl || null,
          facebookUrl: companyData.facebookUrl || null,
          linkedinUrl: companyData.linkedinUrl || null,
          twitterUrl: companyData.twitterUrl || null,
          currencyXid: companyData.currencyXid,
          // hostRefNumber: DO NOT UPDATE
        },
      });

      // Replace host documents (delete old, insert new)
      await tx.hostDocuments.deleteMany({ where: { hostXid: updatedHost.id } });
      if (documents?.length) {
        const docsData = documents.map((doc) => ({
          hostXid: updatedHost.id,
          documentTypeXid: doc.documentTypeXid,
          documentName: doc.documentName,
          filePath: doc.filePath,
        }));
        await tx.hostDocuments.createMany({ data: docsData });
      }

      // Parent company create/update and replace parent docs
      if (companyData.isSubsidairy) {
        // existingHostCompany.hostParent may be array or single object depending on Prisma schema
        let parentRecord = (existingHostCompany as any).hostParent;
        if (Array.isArray(parentRecord)) parentRecord = parentRecord[0];

        if (!parentRecord) {
          // create
          const createdParent = await tx.hostParent.create({
            data: {
              hostXid: updatedHost.id,
              companyName: parentCompanyData.companyName,
              address1: parentCompanyData.address1,
              address2: parentCompanyData.address2 || null,
              cityXid: parentCompanyData.cityXid,
              stateXid: parentCompanyData.stateXid,
              countryXid: parentCompanyData.countryXid,
              pinCode: parentCompanyData.pinCode,
              logoPath: parentCompanyData.logoPath || null,
              isSubsidairy: false,
              registrationNumber: parentCompanyData.registrationNumber,
              panNumber: parentCompanyData.panNumber,
              gstNumber: parentCompanyData.gstNumber || null,
              formationDate: new Date(parentCompanyData.formationDate),
              companyType: parentCompanyData.companyType,
              websiteUrl: parentCompanyData.websiteUrl || null,
              instagramUrl: parentCompanyData.instagramUrl || null,
              facebookUrl: parentCompanyData.facebookUrl || null,
              linkedinUrl: parentCompanyData.linkedinUrl || null,
              twitterUrl: parentCompanyData.twitterUrl || null,
            },
          });

          if (parentDocuments?.length) {
            const parentDocsData = parentDocuments.map((doc) => ({
              hostParentXid: createdParent.id,
              documentTypeXid: doc.documentTypeXid,
              documentName: doc.documentName,
              filePath: doc.filePath,
            }));
            await tx.hostParenetDocuments.createMany({ data: parentDocsData });
          }
        } else {
          // update
          await tx.hostParent.update({
            where: { id: parentRecord.id },
            data: {
              companyName: parentCompanyData.companyName,
              address1: parentCompanyData.address1,
              address2: parentCompanyData.address2 || null,
              cityXid: parentCompanyData.cityXid,
              stateXid: parentCompanyData.stateXid,
              countryXid: parentCompanyData.countryXid,
              pinCode: parentCompanyData.pinCode,
              logoPath: parentCompanyData.logoPath || null,
              registrationNumber: parentCompanyData.registrationNumber,
              panNumber: parentCompanyData.panNumber,
              gstNumber: parentCompanyData.gstNumber || null,
              formationDate: new Date(parentCompanyData.formationDate),
              companyType: parentCompanyData.companyType,
              websiteUrl: parentCompanyData.websiteUrl || null,
              instagramUrl: parentCompanyData.instagramUrl || null,
              facebookUrl: parentCompanyData.facebookUrl || null,
              linkedinUrl: parentCompanyData.linkedinUrl || null,
              twitterUrl: parentCompanyData.twitterUrl || null,
            },
          });

          // replace parent docs
          await tx.hostParenetDocuments.deleteMany({ where: { hostParentXid: parentRecord.id } });
          if (parentDocuments?.length) {
            const parentDocsData = parentDocuments.map((doc) => ({
              hostParentXid: parentRecord.id,
              documentTypeXid: doc.documentTypeXid,
              documentName: doc.documentName,
              filePath: doc.filePath,
            }));
            await tx.hostParenetDocuments.createMany({ data: parentDocsData });
          }
        }
      } else {
        // If previously had a parent and now isSubsidairy=false -> optionally delete parent and its docs
        const previousParent = (existingHostCompany as any).hostParent;
        let prevParentId = null;
        if (Array.isArray(previousParent) && previousParent.length) prevParentId = previousParent[0].id;
        else if (previousParent && previousParent.id) prevParentId = previousParent.id;

        if (prevParentId) {
          await tx.hostParenetDocuments.deleteMany({ where: { hostParentXid: prevParentId } });
          await tx.hostParent.delete({ where: { id: prevParentId } });
        }
      }

      return updatedHost;
    });
  }


  async generateHostRefNumber(tx: any) {
    const lastHost = await tx.hostHeader.findFirst({
      orderBy: {
        id: 'desc',
      },
      select: {
        id: true,
      }
    });

    const nextId = lastHost ? lastHost.id + 1 : 1;
    return `HOSTREFNO-${String(nextId).padStart(6, '0')}`;
  }

  async createOrUpdateHeader(
    activityXid: number,
    pqqQuestionXid: number,
    pqqAnswerXid: number,
    comments: string | null
  ) {
    // find existing header
    const existing = await this.prisma.activityPQQheader.findFirst({
      where: { activityXid, pqqQuestionXid, deletedAt: null }
    });

    if (!existing) {
      return await this.prisma.activityPQQheader.create({
        data: {
          activityXid,
          pqqQuestionXid,
          pqqAnswerXid,
          comments
        }
      });
    }

    // mark old supportings deleted
    await this.prisma.activityPQQSupportings.updateMany({
      where: { activityPqqHeaderXid: existing.id },
      data: {
        isActive: false,
        deletedAt: new Date()
      }
    });

    // update header
    return await this.prisma.activityPQQheader.update({
      where: { id: existing.id },
      data: {
        pqqAnswerXid,
        comments
      }
    });
  }

  async addSupportingFile(
    headerId: number,
    mimeType: string,
    fileUrl: string
  ) {
    return await this.prisma.activityPQQSupportings.create({
      data: {
        activityPqqHeaderXid: headerId,
        mediaType: mimeType,
        mediaFileName: fileUrl
      }
    });
  }

}