// 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';

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 getHostById(id: number) {
    const host = await this.prisma.user.findUnique({ where: { id } });
    if (!host || host.roleXid !== 4) {
      throw new ApiError(404, 'Host 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 createHostUser(email: string) {
    const newUser = await this.prisma.user.create({
      data: { emailAddress: email, roleXid: 4 },
    });
    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(id: number, data: AddPaymentDetailsDTO): Promise<AddPaymentDetailsDTO> {
    const existingUser = await this.prisma.user.findUnique({
      where: { id },
    });
 
    if (!existingUser) {
      throw new ApiError(404, 'User not found');
    }
 
    const addedPaymentDetails = await this.prisma.hostBankDetails.create({
      data,
    });
 
    if (!addedPaymentDetails) {
      throw new ApiError(400, 'Failed to add payment details');
    }
 
    return addedPaymentDetails;
  }

  async addCompanyDetails(
    companyData: HostCompanyDetailsInput,
    documents: HostDocumentInput[] // Documents with S3 URLs
  ) {
    return await this.prisma.$transaction(async (tx) => {
      // ✅ Check for existing company
      const existingHost = await tx.hostHeader.findFirst({
        where: { registrationNumber: companyData.registrationNumber },
      });

      if (existingHost) {
        throw new ApiError(400, 'Company already exists with this registration number');
      }

      // ✅ Create company record
      const createdHost = await tx.hostHeader.create({
        data: {
          companyName: companyData.companyName,
          hostRefNumber: companyData.hostRefNumber,
          address1: companyData.address1,
          address2: companyData.address2,
          cityXid: companyData.cityXid,
          stateXid: companyData.stateXid,
          countryXid: companyData.countryXid,
          pinCode: companyData.pinCode,
          logoPath: companyData.logoPath,
          isSubsidairy: companyData.isSubsidairy,
          registrationNumber: companyData.registrationNumber,
          panNumber: companyData.panNumber,
          gstNumber: companyData.gstNumber,
          formationDate: new Date(companyData.formationDate),
          companyType: companyData.companyType,
          websiteUrl: companyData.websiteUrl,
          instagramUrl: companyData.instagramUrl,
          facebookUrl: companyData.facebookUrl,
          linkedinUrl: companyData.linkedinUrl,
          twitterUrl: companyData.twitterUrl,
          currencyXid: companyData.currencyXid,
        },
      });

      // ✅ Create documents (if provided)
      if (documents && documents.length > 0) {
        const docsData = documents.map((doc) => ({
          hostXid: createdHost.id,
          documentTypeXid: doc.documentTypeXid,
          documentName: doc.documentName,
          filePath: doc.filePath,
        }));

        await tx.hostDocuments.createMany({ data: docsData });
      }

      return createdHost;
    });
  }
}