import {
  BadRequestException,
  Inject,
  Injectable,
  Logger,
} from '@nestjs/common';
import { InjectRepository } from '@nestjs/typeorm';
import { Payment } from '../entities/payment.entity';
import {
  Between,
  FindManyOptions,
  In,
  IsNull,
  MoreThanOrEqual,
  Not,
  Repository,
} from 'typeorm';
import { randomUUID } from 'node:crypto';
import { Cron, CronExpression } from '@nestjs/schedule';
import { BTCPayService } from '../providers/services/btcpay.service';
import { PaymentMethod } from '../entities/payment-method.entity';
import { MailService } from 'src/mail/mail.service';
import * as moment from 'moment';
import { LightningService } from '../providers/services/lightning.service';
import { Type } from '../enums/type.enum';
import { Shareholder } from 'src/contents/entities/shareholder.entity';
import { Frequency } from '../enums/frequency.enum';
import { ProjectsService } from 'src/projects/projects.service';
import { Content } from 'src/contents/entities/content.entity';
import { Status } from '../enums/status.enum';
import { PayoutService } from 'src/payout/payout.service';
import { getAudiencePaymentAmount } from '../helpers/payment-per-period';
import { SubscriptionType } from 'src/subscriptions/enums/types.enum';

@Injectable()
export class PaymentService {
  provider: LightningService;

  constructor(
    private readonly btcpayService: BTCPayService,
    @InjectRepository(Payment)
    private paymentsRepository: Repository<Payment>,
    @InjectRepository(PaymentMethod)
    private paymentMethodsRepository: Repository<PaymentMethod>,
    @InjectRepository(Shareholder)
    private shareholdersRepository: Repository<Shareholder>,
    @Inject(MailService)
    private mailService: MailService,
    @Inject(ProjectsService)
    private projectsService: ProjectsService,
    @Inject(PayoutService)
    private payoutService: PayoutService,
  ) {
    this.provider = this.btcpayService;
  }

  async getPayments(
    filmmakerId: string,
    contentId: string,
  ): Promise<Payment[]> {
    const shareholders = await this.shareholdersRepository.find({
      where: {
        filmmakerId,
        contentId,
      },
      select: ['id'],
    });

    const shareholderIds = shareholders.map((shareholder) => shareholder.id);

    return await this.getPaymentsByShareholderIds(shareholderIds);
  }

  async getPaymentsByProjectIds(
    filmmakerId: string,
    projectIds: string[],
  ): Promise<Payment[]> {
    let allProjects = [];
    if (projectIds.length === 0) {
      allProjects = await this.projectsService.findAll({
        filmmakerId: filmmakerId,
        limit: undefined,
        offset: 0,
        show: 'shareholder',
      });
    }

    const ids =
      projectIds.length === 0
        ? allProjects.map((project) => project.id)
        : projectIds;

    const shareholders = await this.shareholdersRepository
      .createQueryBuilder('shareholder')
      .select('DISTINCT shareholder.id', 'id')
      .innerJoin(Content, 'content', 'shareholder.content_id = content.id')
      .where('shareholder.filmmaker_id = :filmmakerId', { filmmakerId })
      .andWhere('content.project_id IN (:...projectIds)', { projectIds: ids })
      .getRawMany();
    const shareholderIds = shareholders.map((shareholder) => shareholder.id);

    return await this.getPaymentsByShareholderIds(shareholderIds, {
      statuses: ['completed'],
      order: 'DESC',
    });
  }

  async getPaymentsByShareholderIds(
    shareholderIds: string[],
    options: {
      order?: 'ASC' | 'DESC';
      statuses?: Status[];
    } = {},
  ): Promise<Payment[]> {
    const payments = await this.paymentsRepository.find({
      where: {
        shareholderId: In(shareholderIds),
        paymentMethodId: Not(IsNull()),
        status: options?.statuses ? In(options.statuses) : undefined,
      },
      relations: ['paymentMethod'],
      order: { createdAt: options?.order },
    });

    return payments.filter((payment) => payment.paymentMethod);
  }

  async getSatPrice(): Promise<number> {
    return await this.provider.getSatoshiRate();
  }

  async sendPayment(
    userId: string,
    contentId: string,
    subscription: SubscriptionType,
  ): Promise<{ usdAmount: number; milisatAmount: number }> {
    const amount = getAudiencePaymentAmount(subscription);

    await this.payoutService.addAmountToCurrentMonthPayout(
      userId,
      amount.value,
      amount.maxPerMonth,
    );
    await this.shareholdersRepository.update(
      {
        contentId,
        deletedAt: IsNull(),
      },
      {
        pendingRevenue: () =>
          `pending_revenue + (cast(share as decimal) / 100.00 * ${amount.value})`,
      },
    );

    const satPrice = await this.getSatPrice();
    return {
      usdAmount: amount.value,
      milisatAmount: Number((amount.value / satPrice) * 1000),
    };
  }

  @Cron(CronExpression.EVERY_MINUTE)
  async handlePaymentsCron() {
    await Promise.all([
      this.handlePayment('watch'),
      this.handlePayment('rent'),
    ]);
  }

  @Cron(CronExpression.EVERY_DAY_AT_10AM)
  async handleDailyPayments() {
    await Promise.all([
      this.handlePayment('watch', 'daily'),
      this.handlePayment('rent', 'daily'),
    ]);
  }

  @Cron(CronExpression.EVERY_WEEK)
  async handleWeeklyPayments() {
    await Promise.all([
      this.handlePayment('watch', 'weekly'),
      this.handlePayment('rent', 'weekly'),
    ]);
  }

  @Cron(CronExpression.EVERY_1ST_DAY_OF_MONTH_AT_NOON)
  async handleMonthlyPayments() {
    await Promise.all([
      this.handlePayment('watch', 'monthly'),
      this.handlePayment('rent', 'monthly'),
    ]);
  }

  async handlePayment(
    type: 'watch' | 'rent' = 'watch',
    frequency: Frequency = 'automatic',
  ) {
    const satoshiRate = await this.provider.getSatoshiRate();
    const column = type === 'watch' ? 'pendingRevenue' : 'rentPendingRevenue';

    // Rental prices (and therefore rentPendingRevenue) are denominated in
    // sats, not USD. Use a 1-sat minimum threshold for rentals instead of
    // the USD-based satoshiRate.
    const minThreshold = type === 'rent' ? 1 : satoshiRate;

    const options: FindManyOptions<Shareholder> = {
      where: {
        [column]: MoreThanOrEqual(minThreshold),
        filmmaker: {
          paymentMethods: {
            type: 'LIGHTNING',
            selected: true,
            withdrawalFrequency: frequency,
          },
        },
      },
      order: {
        [column]: 'DESC',
      },
      relations: ['filmmaker', 'filmmaker.paymentMethods'],
      take: 5,
    };

    const shareholders = await this.shareholdersRepository.find(options);

    for (const shareholder of shareholders) {
      const selectedPaymentMethod = shareholder.filmmaker.paymentMethods.find(
        (method) => method.selected,
      );
      if (selectedPaymentMethod?.lightningAddress)
        await this.sendLightningPaymentToShareholder(
          shareholder,
          satoshiRate,
          type,
        );
    }
  }

  async sendLightningPaymentToShareholder(
    shareholder: Shareholder,
    satoshiRate: number,
    type: Type,
  ) {
    const revenue =
      type === 'watch'
        ? shareholder.pendingRevenue
        : shareholder.rentPendingRevenue;

    // Rental revenue is already in sats (rentalPrice is denominated in sats).
    // Subscription/watch revenue is in USD and must be converted.
    let rounded: number;
    let revenueToBeSent: number;

    if (type === 'rent') {
      rounded = Math.floor(revenue);
      revenueToBeSent = rounded; // sats in, sats out
    } else {
      const sats = revenue / satoshiRate;
      rounded = Math.floor(sats);
      const missing = sats - rounded;
      const missingRevenue = missing * satoshiRate;
      revenueToBeSent = revenue - missingRevenue;
    }

    if (rounded <= 0) {
      return;
    }

    const selectedLightningAddress = shareholder.filmmaker.paymentMethods.find(
      (method) => method.selected && method.type === 'LIGHTNING',
    );

    const payment = this.paymentsRepository.create({
      id: randomUUID(),
      shareholderId: shareholder.id,
      status: 'pending',
      milisatsAmount: rounded * 1000,
      paymentMethodId: selectedLightningAddress.id,
      usdAmount: revenueToBeSent,
      providerId: 'TBD',
      type,
    });

    const existingPayment = await this.paymentsRepository.exists({
      where: {
        shareholderId: shareholder.id,
        status: 'pending',
        type,
        createdAt: MoreThanOrEqual(moment().subtract(1, 'minute').toDate()),
      },
    });

    if (existingPayment) {
      return;
    } else {
      await this.paymentsRepository.save(payment);
    }

    try {
      const providerPayment = await this.provider.sendPaymentWithAddress(
        selectedLightningAddress.lightningAddress,
        payment,
      );

      payment.providerId = providerPayment.id;
      payment.status = 'completed';

      await (type === 'watch'
        ? this.shareholdersRepository.update(
            { id: shareholder.id },
            {
              pendingRevenue: () => `pending_revenue - ${revenueToBeSent}`,
              updatedAt: () => 'updated_at',
            },
          )
        : this.shareholdersRepository.update(
            { id: shareholder.id },
            {
              rentPendingRevenue: () =>
                `rent_pending_revenue - ${revenueToBeSent}`,
              updatedAt: () => 'updated_at',
            },
          ));
    } catch {
      payment.status = 'failed';
    } finally {
      await this.paymentsRepository.save(payment);
    }
  }

  async getPaymentsByDate(
    shareholderIds: string[],
    date?: Date,
  ): Promise<Payment[]> {
    const createdAt = date ? Between(date, new Date()) : undefined;
    const payments = await this.paymentsRepository.find({
      where: {
        shareholderId: In(shareholderIds),
        createdAt,
        status: 'completed',
      },
      order: {
        createdAt: 'ASC',
      },
    });
    return payments;
  }

  async validateLightningAddress(address: string) {
    return this.provider.validateAddress(address);
  }
}