import { Injectable } from '@nestjs/common'
import { ConfigService } from '@nestjs/config'
import { RpcException } from '@nestjs/microservices'
import { Account } from '@prisma/generated/client'
import { RpcStatus } from '@teacinema/common'
import {
  type RefreshRequest,
  type RefreshResponse,
  SendOtpRequest,
  SendOtpResponse,
  VerifyOtpRequest,
  VerifyOtpResponse
} from '@teacinema/contracts/gen/auth'
import { PassportService } from '@teacinema/passport'

import { AllConfigs } from '@/config'
import { OtpService } from '@/modules/otp/otp.service'

import { AuthRepository } from './auth.repository'

@Injectable()
export class AuthService {
  private readonly ACCESS_TOKEN_TTL: number
  private readonly REFRESH_TOKEN_TTL: number

  public constructor(
    private readonly configService: ConfigService<AllConfigs>,
    private readonly authRepository: AuthRepository,
    private readonly otpService: OtpService,
    private readonly passportService: PassportService
  ) {
    this.ACCESS_TOKEN_TTL = configService.get('passport.accessTtl', {
      infer: true
    })
    this.REFRESH_TOKEN_TTL = configService.get('passport.refreshTtl', {
      infer: true
    })
  }

  public async sendOtp(data: SendOtpRequest): Promise<SendOtpResponse> {
    const { identifier, type } = data

    let account: Account | null = null
    const isPhoneType = type === 'phone'
    const isEmailType = type === 'email'

    if (isPhoneType) {
      account = await this.authRepository.findByPhone(identifier)
    } else {
      account = await this.authRepository.findByEmail(identifier)
    }

    if (!account) {
      account = await this.authRepository.createAccount({
        email: isEmailType ? identifier : undefined,
        phone: isPhoneType ? identifier : undefined
      })
    }

    const code = await this.otpService.send(
      identifier,
      type as 'email' | 'phone'
    )
    console.debug('CODE', code)

    return { ok: true }
  }

  public async verifyOtp(data: VerifyOtpRequest): Promise<VerifyOtpResponse> {
    const { identifier, code, type } = data

    await this.otpService.verify(identifier, code, type as 'email' | 'phone')

    const isPhoneType = type === 'phone'
    const isEmailType = type === 'email'

    const account = isPhoneType
      ? await this.authRepository.findByPhone(identifier)
      : await this.authRepository.findByEmail(identifier)

    if (!account) {
      throw new RpcException({
        code: RpcStatus.NOT_FOUND,
        details: 'Account not found'
      })
    }

    if (isPhoneType && !account.isPhoneVerified) {
      await this.authRepository.updateAccount(account.id, {
        isPhoneVerified: true
      })
    }

    if (isEmailType && !account.isEmailVerified) {
      await this.authRepository.updateAccount(account.id, {
        isEmailVerified: true
      })
    }

    return this.generateTokens(account.id)
  }

  private generateTokens(userId: Account['id']) {
    const payload = {
      sub: userId,
      iat: Date.now(),
      exp: Date.now() + this.ACCESS_TOKEN_TTL
    }
    const accessToken = this.passportService.generate(
      payload.sub,
      this.ACCESS_TOKEN_TTL
    )
    const refreshToken = this.passportService.generate(
      payload.sub,
      this.REFRESH_TOKEN_TTL
    )

    return { accessToken, refreshToken }
  }

  public refresh(data: RefreshRequest): RefreshResponse {
    const { refreshToken } = data
    const result = this.passportService.verify(refreshToken)

    if (!result.valid) {
      throw new RpcException({
        code: RpcStatus.UNAUTHENTICATED,
        // @ts-ignore
        details: result.reason
      })
    }

    return this.generateTokens(result.userId)
  }
}