#!/usr/bin/env bun
// Backfill PII extractions for historical inbound messages.
// Runs regex tier on every qualifying message; LLM tier respects the same
// throttle as the real-time processor unless --force is passed.
//
// Required env: QUINN_DB_URL, QUINN_MACSYNC_DB_URL
// Optional env: MODEL_BOSS_URL, MODEL_BOSS_API_KEY, MODEL_BOSS_MODEL
//
// Usage:
//   bun run scripts/backfill-pii-extraction.ts [--limit N] [--dry-run] [--force]

import { openDb, openIcloudDb } from '@/shared/db';
import * as contactRelationshipRepo from '@/entities/contact-relationship/repo';
import * as clientPiiRepo from '@/entities/client-pii-extraction/repo';
import { logger } from '@/shared/logger';
import { extractFromBody } from '@/processors/pii-extractor/regex-tier';
import { runLlmTier, createModelBossClient, type LlmExtractionMessage } from '@/processors/pii-extractor/llm-tier';
import { applyHysteresis } from '@/processors/pii-extractor/relationship-kind';
import { shouldRunLlmTier } from '@/processors/pii-extractor/throttle';
import type { RelationshipKind } from '@/entities/client-pii-extraction/types';

const args = process.argv.slice(2);
const limitArg = args.find((a) => a.startsWith('--limit='))?.split('=')[1] ?? args[args.indexOf('--limit') + 1];
const limit = limitArg ? parseInt(limitArg, 10) : 500;
const dryRun = args.includes('--dry-run');
const force = args.includes('--force');

const CONFIDENCE_THRESHOLD = 0.5;

interface InboundMessageRow {
  rowid: number;
  text: string;
  chat_identifier: string;
  date: number;
}

interface ClientPiiRow {
  id: number;
  display_name: string | null;
  display_name_override: string | null;
  relationship_kind: string | null;
  relationship_kind_confidence: number | null;
  relationship_kind_streak: number | null;
  pii_extraction_at: string | null;
  introduced_as_name: string | null;
}

async function main(): Promise<void> {
  const quinnUrl = process.env['QUINN_DB_URL'];
  const icloudUrl = process.env['QUINN_MACSYNC_DB_URL'];
  if (!quinnUrl) throw new Error('QUINN_DB_URL required');
  if (!icloudUrl) throw new Error('QUINN_MACSYNC_DB_URL required');

  const quinnSql = openDb(quinnUrl);
  const icloudSql = openIcloudDb(icloudUrl);

  logger.info('backfill-pii-extraction starting', { limit, dryRun, force });

  // Fetch recent inbound messages from iCloud DB
  const messages = await icloudSql<InboundMessageRow[]>`
    SELECT m.rowid, m.text, c.chat_identifier, m.date
    FROM message m
    JOIN chat_message_join cmj ON cmj.message_id = m.rowid
    JOIN chat c ON c.rowid = cmj.chat_id
    WHERE m.is_from_me = 0
      AND m.text IS NOT NULL
      AND length(trim(m.text)) > 0
    ORDER BY m.date DESC
    LIMIT ${limit}
  `;

  logger.info('backfill-pii-extraction: fetched messages', { count: messages.length });

  let regexHits = 0;
  let llmRuns = 0;
  let skipped = 0;
  let failed = 0;

  const modelBoss = process.env['MODEL_BOSS_URL']
    ? createModelBossClient({
        MODEL_BOSS_URL: process.env['MODEL_BOSS_URL'],
        MODEL_BOSS_API_KEY: process.env['MODEL_BOSS_API_KEY'],
        MODEL_BOSS_MODEL: process.env['MODEL_BOSS_MODEL'] ?? 'auto',
      })
    : null;

  for (const msg of messages) {
    const handle = msg.chat_identifier;

    const relationship = await contactRelationshipRepo.findByHandleChannel(quinnSql, handle, 'imessage');
    if (!relationship) {
      skipped++;
      continue;
    }

    const clientId = relationship.clientId;
    const messageId = String(msg.rowid);
    const body = msg.text;

    // Regex tier
    const regexExtractions = extractFromBody(body);
    for (const extraction of regexExtractions) {
      if (extraction.confidence < CONFIDENCE_THRESHOLD) continue;
      regexHits++;

      if (!dryRun) {
        await clientPiiRepo.supersedeField(quinnSql, clientId, extraction.field);
        await clientPiiRepo.insert(quinnSql, {
          clientId,
          field: extraction.field,
          value: extraction.value,
          confidence: extraction.confidence,
          sourceMessageId: messageId,
          source: 'regex',
        });

        await quinnSql`
          UPDATE clients
             SET introduced_as_name            = ${extraction.value},
                 introduced_at                 = to_timestamp(978307200 + ${msg.date}::bigint / 1000000000),
                 introduction_source_message_id = ${messageId},
                 pii_extraction_at             = now(),
                 contact_render_dirty          = true,
                 updated_at                    = now()
           WHERE id = ${clientId}
             AND (introduced_as_name IS NULL OR introduced_as_name != ${extraction.value})
        `;
      }

      logger.info('backfill-pii-extraction: regex hit', {
        clientId,
        field: extraction.field,
        value: extraction.value,
        confidence: extraction.confidence,
        dryRun,
      });
    }

    // LLM tier
    if (!modelBoss) continue;

    const clientRows = await quinnSql<ClientPiiRow[]>`
      SELECT id, display_name, display_name_override, relationship_kind,
             relationship_kind_confidence, relationship_kind_streak, pii_extraction_at,
             introduced_as_name
      FROM clients WHERE id = ${clientId}
    `;
    const clientRow = clientRows[0];
    if (!clientRow) continue;

    const needsLlm = force || shouldRunLlmTier({
      displayName: clientRow.display_name,
      displayNameOverride: clientRow.display_name_override,
      relationshipKind: clientRow.relationship_kind,
      piiExtractionAt: clientRow.pii_extraction_at,
    } as Parameters<typeof shouldRunLlmTier>[0]);

    if (!needsLlm || body.length < 30) continue;

    // Fetch conversation context
    const contextMessages = await icloudSql<Array<{ text: string; is_from_me: number; date: number }>>`
      SELECT m.text, m.is_from_me, m.date
      FROM message m
      JOIN chat_message_join cmj ON cmj.message_id = m.rowid
      JOIN chat c ON c.rowid = cmj.chat_id
      WHERE c.chat_identifier = ${handle}
        AND m.text IS NOT NULL
        AND length(trim(m.text)) > 0
      ORDER BY m.date DESC
      LIMIT 20
    `;

    const llmMessages: LlmExtractionMessage[] = contextMessages
      .reverse()
      .map((r) => ({
        body: r.text,
        isFromMe: r.is_from_me === 1,
        sentAt: new Date(978307200000 + Math.floor(r.date / 1e6)).toISOString(),
      }));

    llmRuns++;

    let llmResult;
    try {
      llmResult = await runLlmTier(modelBoss, llmMessages);
    } catch (err) {
      logger.error('backfill-pii-extraction: LLM failed', { clientId, error: String(err) });
      failed++;
      continue;
    }

    logger.info('backfill-pii-extraction: LLM complete', {
      clientId,
      relationshipKind: llmResult.relationshipKind,
      dryRun,
    });

    if (dryRun) continue;

    const llmFields = [
      { field: 'name' as const, value: llmResult.name, confidence: llmResult.nameConfidence },
      { field: 'location' as const, value: llmResult.location, confidence: llmResult.locationConfidence },
      { field: 'organization' as const, value: llmResult.organization, confidence: llmResult.organizationConfidence },
      { field: 'role' as const, value: llmResult.role, confidence: llmResult.roleConfidence },
    ];

    for (const { field, value, confidence } of llmFields) {
      if (value === null || confidence < CONFIDENCE_THRESHOLD) continue;
      await clientPiiRepo.supersedeField(quinnSql, clientId, field);
      await clientPiiRepo.insert(quinnSql, {
        clientId,
        field,
        value,
        confidence,
        sourceMessageId: messageId,
        source: 'llm',
      });
    }

    if (llmResult.referencesToOthers.length > 0) {
      await clientPiiRepo.supersedeField(quinnSql, clientId, 'references_to_others');
      await clientPiiRepo.insert(quinnSql, {
        clientId,
        field: 'references_to_others',
        value: JSON.stringify(llmResult.referencesToOthers),
        confidence: 0.8,
        sourceMessageId: messageId,
        source: 'llm',
      });
    }

    if (llmResult.relationshipKindConfidence >= CONFIDENCE_THRESHOLD) {
      await clientPiiRepo.supersedeField(quinnSql, clientId, 'relationship_kind');
      await clientPiiRepo.insert(quinnSql, {
        clientId,
        field: 'relationship_kind',
        value: llmResult.relationshipKind,
        confidence: llmResult.relationshipKindConfidence,
        sourceMessageId: messageId,
        source: 'llm',
      });

      const hysteresis = applyHysteresis(
        {
          kind: (clientRow.relationship_kind as RelationshipKind | null) ?? null,
          confidence: clientRow.relationship_kind_confidence ?? 0,
          streak: clientRow.relationship_kind_streak ?? 0,
        },
        llmResult.relationshipKind,
        llmResult.relationshipKindConfidence,
      );

      if (hysteresis.shouldUpdate) {
        await quinnSql`
          UPDATE clients
             SET relationship_kind            = ${hysteresis.nextKind},
                 relationship_kind_confidence = ${hysteresis.nextConfidence},
                 relationship_kind_streak     = ${hysteresis.nextStreak},
                 pii_extraction_at            = now(),
                 contact_render_dirty         = true,
                 updated_at                   = now()
           WHERE id = ${clientId}
        `;
      } else {
        await quinnSql`
          UPDATE clients
             SET relationship_kind_streak = ${hysteresis.nextStreak},
                 pii_extraction_at        = now(),
                 updated_at               = now()
           WHERE id = ${clientId}
        `;
      }
    }

    if (llmResult.name && llmResult.nameConfidence >= CONFIDENCE_THRESHOLD) {
      await quinnSql`
        UPDATE clients
           SET introduced_as_name            = ${llmResult.name},
               pii_extraction_at             = now(),
               contact_render_dirty          = true,
               updated_at                    = now()
         WHERE id = ${clientId}
           AND introduced_as_name IS NULL
      `;
    }

    if (llmResult.location && llmResult.locationConfidence >= CONFIDENCE_THRESHOLD) {
      await quinnSql`
        UPDATE clients SET extracted_location = ${llmResult.location}, updated_at = now() WHERE id = ${clientId}
      `;
    }

    if (llmResult.organization && llmResult.organizationConfidence >= CONFIDENCE_THRESHOLD) {
      await quinnSql`
        UPDATE clients SET extracted_organization = ${llmResult.organization}, updated_at = now() WHERE id = ${clientId}
      `;
    }

    if (llmResult.role && llmResult.roleConfidence >= CONFIDENCE_THRESHOLD) {
      await quinnSql`
        UPDATE clients SET extracted_role = ${llmResult.role}, updated_at = now() WHERE id = ${clientId}
      `;
    }

    if (llmResult.referencesToOthers.length > 0) {
      await quinnSql`
        UPDATE clients
           SET extracted_references = ${JSON.stringify(llmResult.referencesToOthers)}::jsonb,
               updated_at           = now()
         WHERE id = ${clientId}
      `;
    }
  }

  logger.info('backfill-pii-extraction done', {
    regexHits,
    llmRuns,
    skipped,
    failed,
    dryRun,
  });

  await quinnSql.end();
  await icloudSql.end();
}

main().catch((err) => {
  logger.error('backfill-pii-extraction fatal', { error: String(err) });
  process.exit(1);
});