/**
 * AAMOS SIE4 Import Service
 * Port: 3251
 */

import express from 'express';
import { randomUUID } from 'crypto';
import { parseSIE4 } from './parser.mjs';

const PORT = parseInt(process.env.PORT || '3251', 10);
const LEDGER_BASE = process.env.LEDGER_URL || 'http://127.0.0.1:3250';

const app = express();
app.use(express.json({ limit: '10mb' }));

// ── Health ───────────────────────────────────────────────────────────────────

app.get('/health', (_req, res) => {
  res.json({ ok: true, service: 'aamos-sie-import', port: PORT });
});

// ── SIE4 Import ──────────────────────────────────────────────────────────────

app.post('/api/sie/import', async (req, res) => {
  const { sie_content, tenant_id, dry_run = false } = req.body ?? {};

  if (!sie_content || typeof sie_content !== 'string') {
    return res.status(400).json({ ok: false, error: 'sie_content (string) is required' });
  }

  const trace_id      = randomUUID();
  const correlation_id = randomUUID();

  // ── Parse ────────────────────────────────────────────────────────────────
  let parsed;
  try {
    parsed = parseSIE4(sie_content);
  } catch (err) {
    return res.status(400).json({
      ok: false,
      error: `SIE4 parse error: ${err.message}`,
      trace_id,
    });
  }

  const { journal_entries } = parsed;

  // ── Dry run ───────────────────────────────────────────────────────────────
  if (dry_run) {
    return res.json({
      ok: true,
      dry_run: true,
      imported_count: 0,
      skipped_count: journal_entries.length,
      parsed_entries: journal_entries.length,
      company:        parsed.company,
      org_nr:         parsed.org_nr,
      fiscal_year:    parsed.fiscal_year,
      accounts_count: parsed.accounts.length,
      errors:         [],
      trace_id,
      correlation_id,
    });
  }

  // ── Live import ───────────────────────────────────────────────────────────
  const errors  = [];
  let imported_count = 0;
  let skipped_count  = 0;

  const baseHeaders = {
    'Content-Type':    'application/json',
    'X-Tenant-Id':     tenant_id   || '',
    'X-User-Id':       'sie-import',
    'X-Trace-Id':      trace_id,
    'X-Correlation-Id': correlation_id,
  };

  for (const entry of journal_entries) {
    const entryRef = `${entry.series}${entry.number}`;

    const journalBody = {
      date:          entry.date,
      description:   entry.description,
      source_type:   'import_sie',
      series:        entry.series,
      series_number: entry.number,
      correlation_id,
      lines: entry.transactions.map(t => ({
        account:     t.account,
        amount:      t.amount,
        date:        t.date,
        description: t.description,
      })),
    };

    try {
      // 1. Create journal entry
      const createResp = await fetch(`${LEDGER_BASE}/api/ledger/journal`, {
        method:  'POST',
        headers: baseHeaders,
        body:    JSON.stringify(journalBody),
      });

      if (!createResp.ok) {
        const text = await createResp.text().catch(() => createResp.status.toString());
        errors.push({ entry: entryRef, step: 'create', error: text });
        skipped_count++;
        continue;
      }

      const created = await createResp.json().catch(() => null);
      const journalId =
        created?.id ??
        created?.journal_id ??
        created?.data?.id ??
        null;

      if (!journalId) {
        errors.push({ entry: entryRef, step: 'create', error: 'No journal ID in response' });
        skipped_count++;
        continue;
      }

      // 2. Post / commit the journal entry
      const postResp = await fetch(`${LEDGER_BASE}/api/ledger/journal/${journalId}/post`, {
        method:  'POST',
        headers: baseHeaders,
        body:    JSON.stringify({}),
      });

      if (!postResp.ok) {
        const text = await postResp.text().catch(() => postResp.status.toString());
        errors.push({ entry: entryRef, step: 'post', error: text });
        skipped_count++;
        continue;
      }

      imported_count++;
    } catch (err) {
      errors.push({ entry: entryRef, step: 'network', error: err.message });
      skipped_count++;
    }
  }

  res.json({
    ok:              errors.length === 0,
    imported_count,
    skipped_count,
    errors,
    trace_id,
    correlation_id,
  });
});

// ── Start ─────────────────────────────────────────────────────────────────────

app.listen(PORT, '127.0.0.1', () => {
  console.log(`[aamos-sie-import] Listening on 127.0.0.1:${PORT}`);
});