import { Injectable } from '@nestjs/common';
import type { AnyDomainEventEnvelope } from '../domain-events/domain-event-types';
import { OnDomainEvent } from '../domain-events/on-domain-event.decorator';
import { Prisma } from '../../generated/prisma';
import { CalendarSyncService } from './calendar-sync.service';

/**
 * Puts calendar-relevant records into the M365 outbox. Pure DB writer: the
 * Graph call itself happens in CalendarSyncService.processOutbox (worker
 * loop). Errors propagate, so a failed delivery is retried.
 */
@Injectable()
export class CalendarSyncEventHandlers {
  constructor(private readonly calendarSync: CalendarSyncService) {}

  @OnDomainEvent(
    ['InspectionRecorded', 'InspectionCorrected'],
    'calendar-sync.inspection',
  )
  async inspection(
    event: AnyDomainEventEnvelope<'InspectionRecorded' | 'InspectionCorrected'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(tx, 'INSPECTION', event.aggregateId);
  }

  @OnDomainEvent(
    ['TreatmentRecorded', 'TreatmentCorrected'],
    'calendar-sync.treatment',
  )
  async treatment(
    event: AnyDomainEventEnvelope<'TreatmentRecorded' | 'TreatmentCorrected'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(tx, 'TREATMENT', event.aggregateId);
  }

  // The same events, a second entry: the withdrawal span of the treatment.
  // Enqueued also when the treatment has no withdrawal days (any more): the
  // worker then removes an event created earlier.
  @OnDomainEvent(
    ['TreatmentRecorded', 'TreatmentCorrected'],
    'calendar-sync.withdrawal',
  )
  async withdrawal(
    event: AnyDomainEventEnvelope<'TreatmentRecorded' | 'TreatmentCorrected'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(tx, 'WITHDRAWAL', event.aggregateId);
  }

  @OnDomainEvent(
    ['FeedingRecorded', 'FeedingCorrected'],
    'calendar-sync.feeding',
  )
  async feeding(
    event: AnyDomainEventEnvelope<'FeedingRecorded' | 'FeedingCorrected'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(tx, 'FEEDING', event.aggregateId);
  }

  @OnDomainEvent(
    ['HarvestRecorded', 'HarvestCorrected'],
    'calendar-sync.harvest',
  )
  async harvest(
    event: AnyDomainEventEnvelope<'HarvestRecorded' | 'HarvestCorrected'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(tx, 'HARVEST', event.aggregateId);
  }

  // Updated and completed tasks are enqueued even without a due date or
  // when done: the worker then removes an event created earlier.
  @OnDomainEvent(
    ['TaskCreated', 'TaskUpdated', 'TaskCompleted'],
    'calendar-sync.task',
  )
  async task(
    event: AnyDomainEventEnvelope<
      'TaskCreated' | 'TaskUpdated' | 'TaskCompleted'
    >,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    if (event.type === 'TaskCreated' && event.payload.dueDate === null) {
      return;
    }
    await this.calendarSync.enqueueIn(tx, 'TASK', event.aggregateId);
  }

  // The aggregate is the queen; the calendar entry belongs to the history row.
  @OnDomainEvent(['QueenAssigned'], 'calendar-sync.queen-assignment')
  async queenAssignment(
    event: AnyDomainEventEnvelope<'QueenAssigned'>,
    tx: Prisma.TransactionClient,
  ): Promise<void> {
    await this.calendarSync.enqueueIn(
      tx,
      'QUEEN_ASSIGNMENT',
      event.payload.historyId,
    );
  }
}