/**
 * GET /api/change-history — listado del historial de cambios.
 * Query: tenant_id?, entity_type?, limit?, offset?
 */
import { NextRequest, NextResponse } from 'next/server';
import { createClient } from '@/lib/supabase/server';
import { homeTenantId, isAgencyRole, userRole } from '@/lib/agency';
import { listChangeHistory } from '@/lib/change-history';
import { resolveActiveTenant } from '@/lib/tenant-context';

export const dynamic = 'force-dynamic';

export async function GET(req: NextRequest) {
  const supabase = await createClient();
  const {
    data: { user },
  } = await supabase.auth.getUser();
  if (!user) {
    return NextResponse.json({ error: 'Unauthorized' }, { status: 401 });
  }

  const role = userRole(user);
  const isAgency = isAgencyRole(role);
  const sp = req.nextUrl.searchParams;
  const limit = Number(sp.get('limit') || 100);
  const offset = Number(sp.get('offset') || 0);
  const entityType = sp.get('entity_type') || sp.get('entityType') || null;
  const since = sp.get('since') || null;
  const until = sp.get('until') || null;

  let tenantId =
    sp.get('tenant_id') || sp.get('tenantId') || null;

  if (!isAgency) {
    // Cliente: solo su tenant
    const own = homeTenantId(user);
    const ctx = await resolveActiveTenant(user);
    tenantId = own || ctx.tenantId || null;
    if (!tenantId) {
      return NextResponse.json({ error: 'Sin tenant' }, { status: 400 });
    }
  } else if (!tenantId) {
    // Agencia sin filtro: usa contexto activo si hay cliente seleccionado
    const ctx = await resolveActiveTenant(user);
    if (ctx.tenantId && !ctx.portfolioWide) {
      tenantId = ctx.tenantId;
    }
    // Si portfolio wide, tenantId queda null → historial global
  }

  const { rows, error, total } = await listChangeHistory({
    tenantId,
    entityType,
    since,
    until,
    limit,
    offset,
  });

  if (error) {
    const missing =
      /relation .*change_history.* does not exist|Could not find the table/i.test(
        error
      );
    return NextResponse.json(
      {
        ok: false,
        error: missing
          ? 'Falta crear la tabla change_history (sql/change_history.sql).'
          : error,
        rows: [],
        needsMigration: missing,
      },
      { status: missing ? 503 : 500 }
    );
  }

  return NextResponse.json({
    ok: true,
    rows,
    total: total ?? rows.length,
    tenant_id: tenantId,
    portfolio_wide: isAgency && !tenantId,
    since,
    until,
  });
}