import { GraphQLError } from 'graphql';
import type { MutationResolvers } from '../../../__generated__/types.js';
import { isSelfIssuedSenderEvidence } from '../helpers/email-ingestion-issuer.helper.js';
import { EmailIngestionControlProvider } from '../providers/email-ingestion-control.provider.js';

const GRANT_TTL_MS = 5 * 60 * 1000; // 5 minutes

const requestIngestControl: MutationResolvers['requestIngestControl'] = async (
  _parent,
  { input },
  { injector },
) => {
  const control = injector.get(EmailIngestionControlProvider);

  try {
    const aliasResult = await control.resolveAlias(input.recipientAlias);

    if (!aliasResult.found) {
      return {
        __typename: 'CommonError',
        message: `${aliasResult.reason}: ${input.recipientAlias}`,
      };
    }

    // Recognize the issuing business from sender evidence, then bind it into the
    // grant so the ingest step can attribute documents without trusting input.
    // Tries every candidate address (incl. quoted forwarded-header addresses) so
    // manually forwarded mail still resolves to the real issuer.
    const { businessId, config } = await control.recognizeBusinessFromEvidence(
      aliasResult.tenantId,
      input.senderEvidence ?? undefined,
    );

    // Self-issued detection: confirmation emails for invoices the tenant issued
    // through its own invoicing platform (e.g. Morning/greeninvoice). The
    // document already exists on the server from creation, so binding the
    // tenant's own business as the issuer lets the ingest step recognize the
    // duplicate and skip it (see EmailIngestionIngestProvider.performIngest).
    // Mirrors the legacy gmail-listener self-issued skip. The recipient alias is
    // passed as the tenant's own inbound address so a mailing-list forward that
    // rewrites `From` into that alias is still recognized as self — keeping the
    // check tenant-agnostic.
    const selfIssued = isSelfIssuedSenderEvidence(input.senderEvidence ?? undefined, [
      input.recipientAlias,
    ]);
    const issuingBusinessId = selfIssued ? aliasResult.tenantId : businessId;

    const expiresAt = new Date(Date.now() + GRANT_TTL_MS);
    const grant = await control.issueGrant({
      tenantId: aliasResult.tenantId,
      messageId: input.messageId,
      rawMessageHash: input.rawMessageHash,
      expiresAt,
      correlationId: input.correlationId ?? undefined,
      businessId: issuingBusinessId,
    });

    return {
      __typename: 'IngestControlDecision',
      id: grant.decisionId,
      tenantId: grant.tenantId,
      decisionId: grant.decisionId,
      auditId: grant.auditId,
      grant: {
        id: grant.jti,
        jti: grant.jti,
        tenantId: grant.tenantId,
        action: grant.action,
        expiresAt: grant.expiresAt.toISOString(),
      },
      // null signals "no business recognized" → gateway applies default
      // treatment. Self-issued emails are dropped at ingest, so we return no
      // treatment config either, sparing the gateway needless document work
      // (link-fetch / body→PDF) for a document that will be skipped.
      businessEmailConfig:
        !selfIssued && businessId
          ? {
              businessId,
              internalEmailLinks: config.internalEmailLinks ?? null,
              emailBody: config.emailBody ?? null,
              attachments: config.attachments ?? null,
            }
          : null,
    };
  } catch (err) {
    throw new GraphQLError('Failed to process ingest control request', {
      extensions: { code: 'INTERNAL_SERVER_ERROR', cause: err },
    });
  }
};

export const emailIngestionControlResolver = {
  Mutation: {
    requestIngestControl,
  },
};