<?php
/*
    Flexisip Account Manager is a set of tools to manage SIP accounts.
    Copyright (C) 2020 Belledonne Communications SARL, All rights reserved.

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU Affero General Public License as
    published by the Free Software Foundation, either version 3 of the
    License, or (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU Affero General Public License for more details.

    You should have received a copy of the GNU Affero General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

namespace App\Services;

use App\Account;
use App\AccountCreationToken;
use App\Alias;
use App\EmailChangeCode;
use App\Http\Requests\CreateAccountRequest;
use App\Libraries\OvhSMS;
use App\Mail\NewsletterRegistration;
use App\Mail\RecoverByCode;
use App\Mail\RegisterValidation;
use App\PhoneChangeCode;
use Illuminate\Support\Facades\Log;

use App\Rules\AccountCreationToken as RulesAccountCreationToken;
use App\Rules\WithoutSpaces;
use Carbon\Carbon;
use Illuminate\Support\Facades\Mail;
use Illuminate\Http\Request;
use Illuminate\Validation\Rule;

class AccountService
{
    public function __construct(public bool $api = true)
    {
    }

    /**
     * Account creation
     */
    public function store(CreateAccountRequest $request): Account
    {
        $rules = [];
        $rules['password'] = 'confirmed';
        $rules['email'] = 'confirmed';
        $rules['privacy'] = 'accepted';
        $rules['terms'] = 'accepted';

        if ($this->api) {
            $rules = [];
            $rules['account_creation_token'] = ['required', new RulesAccountCreationToken];
        }

        $request->validate($rules);

        if ($this->api) {
            $token = AccountCreationToken::where('token', $request->get('account_creation_token'))->first();
            $token->used = true;
            $token->save();
        }

        $account = new Account;
        $account->username = $request->get('username');
        $account->activated = false;
        $account->domain = config('app.sip_domain');
        $account->ip_address = $request->ip();
        $account->created_at = Carbon::now();
        $account->user_agent = config('app.name');
        $account->dtmf_protocol = $request->get('dtmf_protocol');
        $account->confirmation_key = generatePin();
        $account->provision();
        $account->save();

        $account->updatePassword($request->get('password'), $request->has('algorithm') ? $request->get('algorithm') : 'SHA-256');

        Log::channel('events')->info('Account Service: Account created', ['id' => $account->identifier]);

        if (!$this->api) {
            if (!empty(config('app.newsletter_registration_address')) && $request->has('newsletter')) {
                Mail::to(config('app.newsletter_registration_address'))->send(new NewsletterRegistration($account));
            }
        }

        return Account::withoutGlobalScopes()->find($account->id);
    }

    /**
     * Link a phone number to an account
     */
    public function requestPhoneChange(Request $request)
    {
        $request->validate([
            'phone' => [
                'required', 'unique:aliases,alias',
                'unique:accounts,username',
                new WithoutSpaces, 'starts_with:+'
            ]
        ]);

        $account = $request->user();

        $phoneChangeCode = $account->phoneChangeCode ?? new PhoneChangeCode();
        $phoneChangeCode->account_id = $account->id;
        $phoneChangeCode->phone = $request->get('phone');
        $phoneChangeCode->code = generatePin();
        $phoneChangeCode->save();

        Log::channel('events')->info('Account Service: Account phone change requested by SMS', ['id' => $account->identifier]);

        $ovhSMS = new OvhSMS;
        $ovhSMS->send($request->get('phone'), 'Your ' . config('app.name') . ' validation code is ' . $phoneChangeCode->code);
    }

    public function updatePhone(Request $request): ?Account
    {
        $request->validate($this->api ? [
            'code' => 'required|digits:4'
        ] : [
            'number_1' => 'required|digits:1',
            'number_2' => 'required|digits:1',
            'number_3' => 'required|digits:1',
            'number_4' => 'required|digits:1'
        ]);

        $code = $this->api ? $request->get('code')
            : $request->get('number_1') . $request->get('number_2') . $request->get('number_3') . $request->get('number_4');

        $account = $request->user();

        $phoneChangeCode = $account->phoneChangeCode()->firstOrFail();

        if ($phoneChangeCode->code == $code) {
            $account->alias()->delete();

            $alias = new Alias;
            $alias->alias = $phoneChangeCode->phone;
            $alias->domain = config('app.sip_domain');
            $alias->account_id = $account->id;
            $alias->save();

            Log::channel('events')->info('Account Service: Account phone changed using SMS', ['id' => $account->identifier]);

            $phoneChangeCode->delete();

            $account->activated = true;
            $account->save();

            $account->refresh();

            return $account;
        }

        $phoneChangeCode->delete();

        if ($this->api) {
            abort(403);
        }

        return null;
    }

    /**
     * Link an email to an account
     */
    public function requestEmailChange(Request $request)
    {
        $rules = ['required', 'email', Rule::notIn([$request->user()->email])];

        if (config('app.account_email_unique')) {
            array_push($rules, Rule::unique('accounts', 'email'));
        }

        $request->validate([
            'email' => $rules,
        ]);

        $account = $request->user();

        $emailChangeCode = $account->emailChangeCode ?? new EmailChangeCode;
        $emailChangeCode->account_id = $account->id;
        $emailChangeCode->email = $request->get('email');
        $emailChangeCode->code = generatePin();
        $emailChangeCode->save();

        Log::channel('events')->info('Account Service: Account email change requested by email', ['id' => $account->identifier]);

        Mail::to($emailChangeCode->email)->send(new RegisterValidation($account));
    }

    public function updateEmail(Request $request): ?Account
    {
        $request->validate($this->api ? [
            'code' => 'required|digits:4'
        ] : [
            'number_1' => 'required|digits:1',
            'number_2' => 'required|digits:1',
            'number_3' => 'required|digits:1',
            'number_4' => 'required|digits:1'
        ]);

        $code = $this->api ? $request->get('code')
            : $request->get('number_1') . $request->get('number_2') . $request->get('number_3') . $request->get('number_4');

        $account = $request->user();

        $emailChangeCode = $account->emailChangeCode()->firstOrFail();
        if ($emailChangeCode->validate($code)) {
            $account->email = $emailChangeCode->email;
            $account->save();

            Log::channel('events')->info('Account Service: Account email changed using email', ['id' => $account->identifier]);

            $emailChangeCode->delete();

            $account->activated = true;
            $account->save();

            $account->refresh();

            return $account;
        }

        $emailChangeCode->delete();

        if ($this->api) {
            abort(403);
        }

        return null;
    }

    /**
     * Account recovery
     */

    public function recoverByEmail(Account $account): Account
    {
        $account = $this->recoverAccount($account);

        Mail::to($account)->send(new RecoverByCode($account));

        Log::channel('events')->info('Account Service: Sending recovery email', ['id' => $account->identifier]);

        return $account;
    }

    public function recoverByPhone(Account $account): Account
    {
        $account = $this->recoverAccount($account);

        $ovhSMS = new OvhSMS;
        $ovhSMS->send($account->phone, 'Your ' . config('app.name') . ' validation code is ' . $account->recovery_code);

        Log::channel('events')->info('Account Service: Sending recovery SMS', ['id' => $account->identifier]);

        return $account;
    }

    private function recoverAccount(Account $account): Account
    {
        $account->recovery_code = generatePin();
        $account->provision();
        $account->save();

        return $account;
    }
}