<?php

namespace Models;

use Libs\Database;
use Libs\Hmac;
use Libs\Logger;

/**
 * Provisionamento de empresas (tenants).
 *
 * Cria a empresa e o seu primeiro usuário (admin) de forma ATÔMICA: ou os dois
 * são criados, ou nenhum. Já gera o segredo HMAC da empresa (usado nos webhooks
 * de CRM) no momento da criação.
 */
class CompanyModel
{
    private \PDO $pdo;

    public function __construct()
    {
        $this->pdo = Database::pdo();
    }

    /**
     * Cria a empresa + usuário admin numa única transação.
     *
     * @param array $company ['name', 'cnpj', 'logo']
     * @param array $admin   ['name', 'email', 'phone', 'password']
     * @return array{status:string, company?:array, user?:array}
     *         status: 'created' | 'cnpj_exists' | 'email_exists' | 'error'
     */
    public function createCompanyWithAdmin(array $company, array $admin): array
    {
        $companyName = trim((string) ($company['name'] ?? ''));
        $cnpj = preg_replace('/\D/', '', (string) ($company['cnpj'] ?? ''));
        $logo = trim((string) ($company['logo'] ?? ''));

        $userName = trim((string) ($admin['name'] ?? ''));
        $email = mb_strtolower(trim((string) ($admin['email'] ?? '')));
        $phone = trim((string) ($admin['phone'] ?? ''));
        $password = (string) ($admin['password'] ?? '');

        if ($this->cnpjExists($cnpj)) {
            return ['status' => 'cnpj_exists'];
        }
        if ($this->emailExists($email)) {
            return ['status' => 'email_exists'];
        }

        $secret = Hmac::generateSecret();
        $passwordHash = password_hash($password, PASSWORD_DEFAULT);

        $this->pdo->beginTransaction();
        try {
            $companyStmt = $this->pdo->prepare(
                "INSERT INTO company (company_name, company_cnpj, company_logo, company_hmac_secret)
                VALUES (:name, :cnpj, :logo, :secret)
                RETURNING company_id, company_name, company_cnpj, company_logo,
                          company_hmac_secret, company_created_at"
            );
            $companyStmt->execute([
                'name' => $companyName,
                'cnpj' => $cnpj,
                'logo' => $logo,
                'secret' => $secret,
            ]);
            $createdCompany = $companyStmt->fetch(\PDO::FETCH_ASSOC);
            $companyId = (int) $createdCompany['company_id'];

            $userStmt = $this->pdo->prepare(
                "INSERT INTO \"user\" (company_id, user_name, user_phone, user_email, user_role, user_password)
                VALUES (:company_id, :user_name, :user_phone, :user_email, 'admin', :user_password)
                RETURNING user_id, company_id, user_name, user_phone, user_email, user_role, user_created_at"
            );
            $userStmt->execute([
                'company_id' => $companyId,
                'user_name' => $userName,
                'user_phone' => $phone,
                'user_email' => $email,
                'user_password' => $passwordHash,
            ]);
            $createdUser = $userStmt->fetch(\PDO::FETCH_ASSOC);

            $this->pdo->commit();
        } catch (\Throwable $e) {
            $this->pdo->rollBack();
            Logger::error('Failed to create company with admin', [
                'cnpj' => $cnpj,
                'email' => $email,
                'error' => $e->getMessage(),
            ]);
            return ['status' => 'error'];
        }

        return [
            'status' => 'created',
            'company' => [
                'company_id' => $companyId,
                'company_name' => $createdCompany['company_name'],
                'company_cnpj' => $createdCompany['company_cnpj'],
                'company_logo' => $createdCompany['company_logo'],
                'company_hmac_secret' => $createdCompany['company_hmac_secret'],
                'company_created_at' => $createdCompany['company_created_at'],
            ],
            'user' => [
                'user_id' => (int) $createdUser['user_id'],
                'company_id' => (int) $createdUser['company_id'],
                'user_name' => $createdUser['user_name'],
                'user_phone' => $createdUser['user_phone'],
                'user_email' => $createdUser['user_email'],
                'user_role' => $createdUser['user_role'],
                'user_created_at' => $createdUser['user_created_at'],
            ],
        ];
    }

    private function cnpjExists(string $cnpj): bool
    {
        $stmt = $this->pdo->prepare(
            "SELECT 1 FROM company
            WHERE company_cnpj = :cnpj AND company_deleted_at = 'infinity'
            LIMIT 1"
        );
        $stmt->execute(['cnpj' => $cnpj]);

        return $stmt->fetchColumn() !== false;
    }

    private function emailExists(string $email): bool
    {
        // user_email é UNIQUE global (não filtra por empresa).
        $stmt = $this->pdo->prepare('SELECT 1 FROM "user" WHERE user_email = :email LIMIT 1');
        $stmt->execute(['email' => $email]);

        return $stmt->fetchColumn() !== false;
    }
}