/**
 * Nightly match-generation workflow — the scoring engine v1 (Stage 2).
 *
 * For every candidate org (NH, good standing, primary ICP):
 *   1. Ensure a profile embedding exists (v0: NTEE-derived mission text
 *      embedded as RETRIEVAL_QUERY; the Stage 4 research profiler upgrades
 *      the row later without this workflow changing).
 *   2. Retrieve top-K open grants by cosine similarity, SQL-gated on the
 *      cheap hard constraints (deadline runway, award floor).
 *   3. Run the remaining hard gates in TS (entity eligibility, geography)
 *      and the deterministic subscores; upsert one match row per pair.
 *   4. Reassign the org's hero match.
 *
 * The `application_form_supported` gate is deliberately EXCLUDED from
 * pass/fail (2026-07-16 decision: manual-first launch — draftability is
 * verified by hand for the top leads; no grant has the flag set yet, so
 * enforcing it would zero out every match). Its failure still lands in
 * `rationale.gateFailures` so the review queue can show it, and the gate
 * re-arms by simply removing it from IGNORED_GATES once solicitation
 * support data flows in.
 *
 * Runs at 05:15, after embeddings (04:15) and alongside-safe with
 * enrichment (05:00) — a not-yet-enriched org simply isn't a candidate.
 */
import { DBOS, SchedulerMode } from '@dbos-inc/dbos-sdk';
import { generateQueryEmbedding } from '@novelpad/outreach-ai';
import {
  buildOrgMissionText,
  evaluateHardGates,
  scoreMatch,
  type HardGateFailureReason,
  type schema,
} from '@novelpad/outreach-core';
import {
  serverAssignHeroMatch,
  serverGetOrCreateOrgProfileEmbedding,
  serverListEligibleGrantsForOrg,
  serverListMatchCandidateOrgs,
  serverUpsertMatchScore,
  type EligibleGrantWithSimilarity,
  type MatchCandidateOrg,
} from '@novelpad/outreach-core/server';
import type { NodePgDatabase } from 'drizzle-orm/node-postgres';

export type OutreachDb = NodePgDatabase<typeof schema>;

const CANDIDATE_ORG_LIMIT = 500;
const GRANTS_PER_ORG = 50;
const MIN_DAYS_TO_DEADLINE = 21;
const MIN_AWARD_CEILING = 10_000;
/** See module doc — manual-first launch decision. */
const IGNORED_GATES: ReadonlySet<HardGateFailureReason> = new Set([
  'application_form_unsupported',
]);
/** Registry charities are 501(c)(3)s for gate purposes (NHDOJ registers
 * charitable trusts; the rare non-c3 gets caught at human review). */
const ASSUMED_ENTITY_TYPE = '501c3';

export interface MatchGrantsDeps {
  readonly db: OutreachDb;
}

let registeredDeps: MatchGrantsDeps | null = null;

export function setMatchGrantsDeps(deps: MatchGrantsDeps): void {
  registeredDeps = deps;
}

function getMatchGrantsDeps(): MatchGrantsDeps {
  if (registeredDeps == null) {
    throw new Error(
      'MatchGrantsDeps not registered. Call setMatchGrantsDeps() before DBOS.launch().',
    );
  }
  return registeredDeps;
}

async function listCandidateOrgs(db: OutreachDb): Promise<MatchCandidateOrg[]> {
  return serverListMatchCandidateOrgs(db, { limit: CANDIDATE_ORG_LIMIT });
}
const listCandidateOrgsStep = DBOS.registerStep(listCandidateOrgs, {
  name: 'listMatchCandidateOrgs',
  retriesAllowed: true,
  maxAttempts: 3,
});

async function ensureOrgEmbedding(
  db: OutreachDb,
  org: MatchCandidateOrg,
): Promise<number[]> {
  const missionStatement = buildOrgMissionText(org);
  // Embedding first, insert second: generateQueryEmbedding is only called
  // when no profile exists — checked inside, but the extra call for
  // already-profiled orgs is avoided by the cheap select happening there.
  const existingOrStub = await serverGetOrCreateOrgProfileEmbedding(db, {
    orgId: org.id,
    missionStatement,
    profileEmbedding: await generateQueryEmbedding(missionStatement),
  });
  return existingOrStub.embedding;
}
const ensureOrgEmbeddingStep = DBOS.registerStep(ensureOrgEmbedding, {
  name: 'ensureOrgEmbedding',
  retriesAllowed: true,
  maxAttempts: 3,
});

async function retrieveGrants(
  db: OutreachDb,
  embedding: number[],
  orgState: string,
): Promise<EligibleGrantWithSimilarity[]> {
  return serverListEligibleGrantsForOrg(db, embedding, {
    orgState,
    minDaysToDeadline: MIN_DAYS_TO_DEADLINE,
    minAwardCeiling: MIN_AWARD_CEILING,
    limit: GRANTS_PER_ORG,
  });
}
const retrieveGrantsStep = DBOS.registerStep(retrieveGrants, {
  name: 'retrieveGrantsForOrg',
  retriesAllowed: true,
  maxAttempts: 3,
});

/** Case/punctuation/suffix-insensitive equality for self-match detection. */
function normalizeSelfMatchName(name: string): string {
  return name
    .toUpperCase()
    .replace(/\b(INC|INCORPORATED|TTEE|TRUSTEE|FUND|FOUNDATION|CHARITABLE|TRUST)\b/g, '')
    .replace(/[^A-Z0-9]/g, '');
}

async function scoreAndStoreOrgMatches(
  db: OutreachDb,
  org: MatchCandidateOrg,
  grants: EligibleGrantWithSimilarity[],
): Promise<{ stored: number; gated: number }> {
  const now = new Date();
  let stored = 0;
  let gated = 0;

  for (const grant of grants) {
    // A foundation's synthesized grant must never match the foundation's
    // own org row ("we found you $50K — from yourself"). EIN when both
    // sides have one; normalized-name fallback because many NHDOJ org rows
    // haven't resolved an EIN yet — a self-match is worse than a missed
    // match here.
    const isSelfByEin =
      grant.funderEin != null &&
      org.ein != null &&
      grant.funderEin === org.ein;
    const isSelfByName =
      grant.funderEin != null &&
      normalizeSelfMatchName(grant.funder) === normalizeSelfMatchName(org.name);
    if (isSelfByEin || isSelfByName) {
      gated++;
      continue;
    }
    const gates = evaluateHardGates(
      { entityType: ASSUMED_ENTITY_TYPE, state: org.state },
      {
        eligibilityEntityTypes: grant.eligibilityEntityTypes,
        geographicScope: grant.geographicScope,
        closeDate: grant.closeDate,
        awardCeiling: grant.awardCeiling,
        applicationFormSupported: grant.applicationFormSupported,
      },
      { now },
    );
    const effectiveFailures = gates.failures.filter(
      (f) => !IGNORED_GATES.has(f),
    );
    const hardGatesPassed = effectiveFailures.length === 0;
    if (!hardGatesPassed) {
      gated++;
      continue; // Failed pairs aren't stored — the queue shows real candidates only.
    }

    const scored = scoreMatch({
      similarity: grant.similarity,
      funderStateGrantCount: grant.funderStateGrantCount,
      orgTotalRevenue: org.totalRevenue,
      awardCeiling: grant.awardCeiling,
      geographicScope: grant.geographicScope,
      applicationEffortEstimate: grant.applicationEffortEstimate,
      closeDate: grant.closeDate,
      now,
    });

    await serverUpsertMatchScore(db, {
      orgId: org.id,
      grantId: grant.id,
      totalScore: scored.totalScore,
      subscores: scored.subscores,
      hardGatesPassed,
      easyWin: scored.easyWin,
      rationale: {
        similarity: grant.similarity,
        gateFailures: gates.failures,
        ignoredGates: [...IGNORED_GATES],
        scoredAt: now.toISOString(),
        scoringVersion: 'v2-state-precedent',
      },
    });
    stored++;
  }

  await serverAssignHeroMatch(db, org.id);
  return { stored, gated };
}
const scoreAndStoreOrgMatchesStep = DBOS.registerStep(scoreAndStoreOrgMatches, {
  name: 'scoreAndStoreOrgMatches',
  retriesAllowed: true,
  maxAttempts: 3,
});

async function runMatchGrants(): Promise<void> {
  const { db } = getMatchGrantsDeps();

  const orgs = await listCandidateOrgsStep(db);
  if (orgs.length === 0) {
    console.log('[match-grants] no candidate orgs (enrichment backlog?)');
    return;
  }

  let totalStored = 0;
  let totalGated = 0;
  let failedOrgs = 0;
  for (const org of orgs) {
    try {
      const embedding = await ensureOrgEmbeddingStep(db, org);
      const grants = await retrieveGrantsStep(db, embedding, org.state);
      const { stored, gated } = await scoreAndStoreOrgMatchesStep(
        db,
        org,
        grants,
      );
      totalStored += stored;
      totalGated += gated;
    } catch (err) {
      failedOrgs++;
      console.error(`[match-grants] org "${org.name}" failed:`, err);
    }
  }

  console.log(
    `[match-grants] orgs=${orgs.length} matchesStored=${totalStored} gatedOut=${totalGated} failedOrgs=${failedOrgs}`,
  );
  if (failedOrgs > 0 && failedOrgs / orgs.length > 0.2) {
    throw new Error(
      `[match-grants] systemic failure: ${failedOrgs}/${orgs.length} orgs failed`,
    );
  }
}

const g = globalThis as unknown as {
  __outreachMatchGrantsRegistered?: boolean;
  __outreachMatchGrantsHandle?: (
    scheduledTime: Date,
    startedAt: Date,
  ) => Promise<void>;
};

if (!g.__outreachMatchGrantsRegistered) {
  g.__outreachMatchGrantsRegistered = true;

  const matchGrants = async (_scheduledTime: Date, _startedAt: Date) => {
    try {
      await runMatchGrants();
    } catch (err) {
      console.error('[match-grants] pass failed:', err);
      throw err;
    }
  };

  // Must be registered as BOTH a workflow and a scheduled function,
  // referencing the same function object — see ingest-grants.ts.
  g.__outreachMatchGrantsHandle = DBOS.registerWorkflow(matchGrants, {
    name: 'matchGrants',
  });
  DBOS.registerScheduled(matchGrants, {
    crontab: '15 5 * * *',
    name: 'matchGrants',
    mode: SchedulerMode.ExactlyOncePerInterval,
  });
}

/**
 * Starts one durable run of this workflow immediately through DBOS —
 * the exact production path (workflow + checkpointed steps), used by
 * `run-once.ts` for supervised/manual passes. Requires deps injected and
 * `DBOS.launch()` completed.
 */
export function runMatchGrantsNow(): Promise<void> {
  const handle = g.__outreachMatchGrantsHandle;
  if (handle == null) {
    throw new Error(
      'matchGrants is not registered; was this module imported before DBOS.launch()?',
    );
  }
  return handle(new Date(), new Date());
}