import { Injectable, Logger } from '@nestjs/common';
import { isPermanentBillingPlan } from '@mento/shared';
import { SmsGatewayService } from '../sms-billing/sms-gateway.service';
import { PrismaService } from '../prisma/prisma.service';
import {
  newAccountSms,
  subscriptionEndedSms,
  type NewAccountSource,
} from './platform-admin-alert';

@Injectable()
export class PlatformAdminAlertService {
  private readonly logger = new Logger(PlatformAdminAlertService.name);

  constructor(
    private readonly prisma: PrismaService,
    private readonly sms: SmsGatewayService,
  ) {}

  /** ساخت حساب جدید؛ خطای پیامک جلوی ثبت‌نام یا ساخت محیط را نمی‌گیرد. */
  async notifyNewAccount(input: {
    source: NewAccountSource;
    organizationName: string;
    ownerName: string;
    mobile: string | null;
  }): Promise<void> {
    try {
      const delivered = await this.sendToAdmins(newAccountSms(input));
      if (!delivered) {
        this.logger.warn(`new account SMS was not delivered (${input.source})`);
      }
    } catch (error) {
      this.logger.warn(
        `new account SMS failed: ${error instanceof Error ? error.message : 'unknown'}`,
      );
    }
  }

  /**
   * یک‌بار هنگام تمام شدن اشتراک. اگر ارسال نشود پرچم خالی می‌ماند تا بعداً دوباره تلاش شود.
   */
  async notifySubscriptionEnded(billingAccountId: string): Promise<void> {
    const row = await this.prisma.billingAccount.findUnique({
      where: { id: billingAccountId },
      select: {
        id: true,
        planCode: true,
        status: true,
        expiresAt: true,
        expiryNotifiedAt: true,
        owner: {
          select: {
            fullName: true,
            mobile: true,
            memberships: {
              where: { role: 'owner', isActive: true },
              select: { organization: { select: { name: true } } },
            },
          },
        },
      },
    });
    if (!row || row.expiryNotifiedAt) return;
    if (row.status === 'suspended') return;
    if (isPermanentBillingPlan(row.planCode)) {
      await this.prisma.billingAccount.update({
        where: { id: row.id },
        data: { expiryNotifiedAt: new Date() },
      });
      return;
    }
    if (row.expiresAt.getTime() > Date.now() && row.status !== 'expired') return;

    const claimed = await this.prisma.billingAccount.updateMany({
      where: { id: row.id, expiryNotifiedAt: null },
      data: { status: 'expired', expiryNotifiedAt: new Date() },
    });
    if (claimed.count !== 1) return;

    try {
      const delivered = await this.sendToAdmins(
        subscriptionEndedSms({
          organizationNames: row.owner.memberships.map((item) => item.organization.name),
          ownerName: row.owner.fullName,
          mobile: row.owner.mobile,
          planCode: row.planCode,
          expiresAt: row.expiresAt,
        }),
      );
      if (!delivered) {
        await this.prisma.billingAccount.update({
          where: { id: row.id },
          data: { expiryNotifiedAt: null },
        });
      }
    } catch (error) {
      this.logger.warn(
        `subscription SMS failed ${row.id}: ${error instanceof Error ? error.message : 'unknown'}`,
      );
      await this.prisma.billingAccount
        .update({
          where: { id: row.id },
          data: { expiryNotifiedAt: null },
        })
        .catch(() => undefined);
    }
  }

  /** true یعنی حداقل یک پیامک رفت، یا مدیری با موبایل فعال وجود نداشت. */
  private async sendToAdmins(text: string): Promise<boolean> {
    const admins = await this.prisma.platformAdmin.findMany({
      where: { isActive: true, mobile: { not: null } },
      select: { mobile: true },
    });
    const mobiles = [
      ...new Set(
        admins
          .map((admin) => admin.mobile?.trim() ?? '')
          .filter((mobile) => mobile.length > 0),
      ),
    ];
    if (!mobiles.length) {
      this.logger.warn('platform admin SMS skipped: no active admin mobile');
      return true;
    }

    let delivered = false;
    for (const mobile of mobiles) {
      try {
        const result = await this.sms.send({
          phone: mobile,
          text,
          source: 'platform-admin',
        });
        if (result.ok) delivered = true;
        else {
          this.logger.warn(
            `platform admin SMS failed to=…${mobile.slice(-4)} reason=${result.reason ?? 'unknown'}`,
          );
        }
      } catch (error) {
        this.logger.warn(
          `platform admin SMS failed to=…${mobile.slice(-4)}: ${
            error instanceof Error ? error.message : 'unknown'
          }`,
        );
      }
    }
    return delivered;
  }
}