import postgres from 'npm:postgres@3.4.4';

function getDb() {
  return postgres({
    host: Deno.env.get('PG_HOST'),
    port: parseInt(Deno.env.get('PG_PORT') || '5432'),
    user: Deno.env.get('PG_USER'),
    password: Deno.env.get('PG_PASSWORD'),
    database: Deno.env.get('PG_DBNAME'),
    ssl: false,
    max: 1,
  });
}

Deno.serve(async (req) => {
  if (req.method === 'OPTIONS') {
    return new Response(null, {
      status: 204,
      headers: {
        'Access-Control-Allow-Origin': '*',
        'Access-Control-Allow-Methods': 'POST, OPTIONS',
        'Access-Control-Allow-Headers': 'Content-Type, Authorization',
      },
    });
  }

  if (req.method !== 'POST') {
    return Response.json({ error: 'Method not allowed' }, { status: 405 });
  }

  const sql = getDb();

  try {
    const body = await req.json();
    const { datum, prevadzka, operacia } = body;

    if (!datum || !prevadzka || !operacia) {
      return Response.json(
        { error: 'Missing required fields: datum, prevadzka, operacia' },
        { status: 400, headers: { 'Access-Control-Allow-Origin': '*' } }
      );
    }

    const validOperations = [
      'prihlasenie', 'odhlasenie', 'synchronizacia', 'aktualizacia',
      'zalohovanie', 'obnova', 'export', 'import', 'inventura', 'uzavierka'
    ];
    if (!validOperations.includes(operacia)) {
      return Response.json(
        { error: `Invalid operacia. Must be one of: ${validOperations.join(', ')}` },
        { status: 400, headers: { 'Access-Control-Allow-Origin': '*' } }
      );
    }

    // Ensure table exists
    await sql`
      CREATE TABLE IF NOT EXISTS housekeeping_records (
        id SERIAL PRIMARY KEY,
        datum TIMESTAMP NOT NULL,
        prevadzka VARCHAR(255) NOT NULL,
        licencia VARCHAR(255),
        operacia VARCHAR(50) NOT NULL,
        verzia VARCHAR(50),
        typ_os VARCHAR(10),
        poznamka_prevadzky TEXT,
        poznamka_operacie TEXT,
        created_at TIMESTAMP DEFAULT NOW()
      )
    `;

    const result = await sql`
      INSERT INTO housekeeping_records (datum, prevadzka, licencia, operacia, verzia, typ_os, poznamka_prevadzky, poznamka_operacie)
      VALUES (${body.datum}, ${body.prevadzka}, ${body.licencia || null}, ${body.operacia}, ${body.verzia || null}, ${body.typOS || null}, ${body.poznamka_prevadzky || null}, ${body.poznamka_operacie || null})
      RETURNING id
    `;

    await sql.end();

    return Response.json(
      { success: true, id: result[0].id },
      { status: 201, headers: { 'Access-Control-Allow-Origin': '*' } }
    );
  } catch (error) {
    await sql.end();
    return Response.json(
      { error: error.message },
      { status: 500, headers: { 'Access-Control-Allow-Origin': '*' } }
    );
  }
});