import fs from 'node:fs';
import path from 'node:path';
import os from 'node:os';
import { fileURLToPath } from 'node:url';
import { DatabaseSync } from 'node:sqlite';
import { openDb, setSetting } from '../../src/db.mjs';
import { hashPassword } from '../../src/auth.mjs';
import { createUser } from '../../src/db.mjs';
import { createAppServer } from '../../src/server/index.mjs';
import { seedCampaigns } from '../../src/outreach/campaign-store.mjs';

const DEBUG = process.env.DEBUG_SERVER === '1';
const log = DEBUG ? (m) => process.stderr.write(`[test-server] ${m}\n`) : () => {};

function randomHex(length) {
  const bytes = new Uint8Array(Math.ceil(length / 2));
  crypto.getRandomValues(bytes);
  return Array.from(bytes).map((b) => b.toString(16).padStart(2, '0')).join('').slice(0, length);
}

export async function startTestServer() {
  const tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'mcp-test-'));
  const dbPath = path.join(tmpDir, 'test.db');

  process.env.APP_DB_PATH = dbPath;
  process.env.APP_WHATSAPP_AUTH_DIR = path.join(tmpDir, 'whatsapp-auth');

  const db = openDb(dbPath);

  const adminPw = 'admin-senha-teste';
  createUser(db, { username: 'admin', passwordHash: hashPassword(adminPw), role: 'admin' });

  seedCampaigns(db);
  setSetting(db, 'outreach.mensagensPorDia', '10');

  const campaignIds = db.prepare('SELECT id, code FROM outreach_campaigns ORDER BY id').all();
  const leadIds = [];
  const empresas = {
    '1': ['Hamburgueria Bella', 'Pizzaria Famosa', 'Acaiteria Tropical', 'Marmitaria Sabor', 'Lanchonete do Ze'],
    '2': ['Restaurante Chefe', 'Mercado Central', 'Mercearia Sao Jose', 'Minimercado Bom', 'Padaria Pao Quente'],
    '3': ['Loja de Moda', 'Material Construcao', 'Autopecas Veloz', 'Oficina Mecanica']
  };

  let leadIdCounter = 1;
  for (const c of campaignIds) {
    const names = empresas[c.code] || ['Empresa Generica'];
    for (const nome of names) {
      const whatsapp = `5511999${String(leadIdCounter).padStart(6, '0')}`;
      const r = db.prepare(
        `INSERT INTO leads (dedup_key, empresa, whatsapp, segmento, prioridade, score, classificacao, telefone_valido)
         VALUES (?, ?, ?, ?, ?, ?, 'bom', 1)`
      ).run(
        `browser-test-lead-${leadIdCounter}`,
        nome,
        whatsapp,
        c.code === 'gdelivery-food' ? 'hamburguerias' : c.code === 'gti-food' ? 'restaurantes' : 'lojas_de_roupa',
        leadIdCounter <= 5 ? 1 : 2,
        100 - leadIdCounter
      );
      const lid = Number(r.lastInsertRowid);
      leadIds.push({ id: lid, empresa: nome, whatsapp, campaignId: c.id });

      db.prepare(
        `INSERT INTO whatsapp_number_verifications (numero, status, numero_resolvido, checked_at)
         VALUES (?, 'confirmado', ?, datetime('now'))`
      ).run(whatsapp, whatsapp);

      leadIdCounter += 1;
    }
  }

  const firstLead = leadIds[0];
  setSetting(db, 'outreach.ativo', 'true');

  const firstCampaignId = campaignIds[0].id;
  const variantIds = db.prepare(
    'SELECT id FROM outreach_campaign_variants WHERE campaign_id = ? ORDER BY code LIMIT 1'
  ).all(firstCampaignId);
  if (variantIds.length > 0 && firstLead) {
    const variantId = variantIds[0].id;
    const produto = db.prepare('SELECT produto FROM outreach_campaigns WHERE id = ?').get(firstCampaignId).produto;
    db.prepare(
      `INSERT INTO outreach_campaign_queue
       (campaign_id, lead_id, variant_id, produto, numero, segmento, rendered_message, selection_reason, status)
       VALUES (?, ?, ?, ?, ?, ?, ?, ?, 'preview')`
    ).run(firstCampaignId, firstLead.id, variantId, produto, firstLead.whatsapp, 'hamburguerias',
      'Ola! Teste de mensagem renderizada para campanha.', 'browser-test');
  }

  const stageLeadId = leadIds.length > 2 ? leadIds[2].id : (firstLead ? firstLead.id : null);
  if (stageLeadId) {
    db.prepare(
      `INSERT INTO outreach_lead_states (lead_id, stage, first_reply_at)
       VALUES (?, 'respondeu', datetime('now'))`
    ).run(stageLeadId);
    db.prepare(
      `INSERT INTO outreach_stage_events (lead_id, campaign_id, stage, note)
       VALUES (?, ?, 'respondeu', 'cliente quer saber mais sobre G-Delivery')`
    ).run(stageLeadId, firstCampaignId);
  }

  const replyLeadId = leadIds.length > 1 ? leadIds[1].id : (firstLead ? firstLead.id : null);
  if (replyLeadId) {
    db.prepare(
      `INSERT OR IGNORE INTO outreach_inbound_replies (provider_message_id, lead_id, numero, received_at)
       VALUES (?, ?, ?, datetime('now'))`
    ).run(`test-inbound-${Date.now()}`, replyLeadId, leadIds[1]?.whatsapp || '5511999990002');
  }

  let fakeSends = [];

  const whatsapp = {
    getStatus: () => ({ state: 'READY', connected: true }),
    getQr: () => null,
    connect: async () => {},
    disconnect: async () => {},
    checkNumber: async (number) => ({
      registered: true,
      numero: number,
      numeroResolvido: number,
      status: 'confirmado'
    }),
    sendText: async () => {
      fakeSends.push({ at: new Date().toISOString() });
      throw new Error('fake manager nao envia mensagens reais');
    }
  };

  const jobs = { subscribe: () => null, activeJobs: () => [] };

  const server = createAppServer({ db, jobs, whatsapp, log });

  return new Promise((resolve, reject) => {
    server.listen(3911, '127.0.0.1', () => {
      log(`server listening on 3911`);

      const apiRequest = async (method, path, options = {}) => {
        const url = `http://127.0.0.1:3911${path}`;
        const headers = { ...options.headers };
        if (options.body && !headers['content-type']) {
          headers['content-type'] = 'application/json';
        }
        const response = await fetch(url, {
          method,
          headers,
          body: options.body ? JSON.stringify(options.body) : undefined
        });
        let data = null;
        try {
          data = await response.json();
        } catch {
          data = null;
        }
        return { status: response.status, headers: response.headers, data, raw: response };
      };

      const teardown = async () => {
        await new Promise((r) => server.close(r));
        db.close();
        try { fs.rmSync(tmpDir, { recursive: true, force: true }); } catch {}
        log('test server teardown complete');
      };

      resolve({ server, db, tmpDir, whatsapp, fakeSends, apiRequest, teardown, adminPw });
    });
    server.on('error', reject);
  });
}