<?php

namespace App\Controllers\Frontend;

use App\Controllers\BaseController;
use CodeIgniter\API\ResponseTrait;
use App\Models\Customer;
use App\Models\CustomerVerifyCode;
use App\Models\SettingCustomerType;
use App\Models\CustomerAddress;
use App\Models\CustomerPoint;
use App\Models\SettingMembershipTier;

use Firebase\JWT\JWT;

helper('image');

class AuthController extends BaseController
{   
    use ResponseTrait;
    
    private $customerModel;
    private $customerVerifyModel;
    private $customerTypeModel;
    private $customerAddressModel;
    private $customerPointModel;
    private $membershipTierModel;
    private $wato;

    public function __construct()
    {
        $this->customerModel = new Customer();
        $this->customerVerifyModel = new CustomerVerifyCode();
        $this->customerTypeModel = new SettingCustomerType();
        $this->customerAddressModel = new CustomerAddress();
        $this->customerPointModel = new CustomerPoint();
        $this->membershipTierModel = new SettingMembershipTier();
        $this->wato = new \App\Libraries\Wato();
    }
    
    public function sendOtp()
    {   
        // echo(1);exit;
        helper(['form']);

        $validationRules = [
            'phone_number' => 'required|min_length[9]|max_length[15]',
            'send_via'     => 'required|in_list[sms,whatsapp]'
        ];

        if (!$this->validate($validationRules)) {
            return $this->failValidationErrors($this->validator->getErrors());
        }
        
        $phone = $this->request->getVar('phone_number');
        $sendVia = $this->request->getVar('send_via');

        $customer = $this->customerModel
            ->where('phone', $phone)
            ->where('status', 'active')
            ->where('deleted_at', null)
            ->first();

        $verifyType = $customer ? 'login' : 'register';

        // Generate OTP
        $otp = str_pad(random_int(0, 999999), 6, '0', STR_PAD_LEFT);
        // Insert OTP into DB (no need to check customer existence)
        $this->customerVerifyModel->insert([
            'customer_id'  => $customer ? $customer['id'] : 0, 
            'phone_number' => $phone,
            'verify_type'  => $verifyType, // Not known yet
            'verify_code'  => $otp,
            'status'       => 'pending',
            'created_at'   => date('Y-m-d H:i:s')
        ]);

        // Send OTP via preferred method (SMS or WhatsApp) — can be handled later
        $message = "Your OTP is: " . $otp;
        $this->wato->pushNotification($phone, $message);
        
        // Get the inserted record
        $insertedId = $this->customerVerifyModel->getInsertID();
        $otpData = $this->customerVerifyModel->find($insertedId);

        $customerOtpData = [
            'id'           => $otpData['id'],
            // 'customer_id'  => $otpData['customer_id'],
            'status'       => $otpData['status'],
            'verify_type'  => $otpData['verify_type'],
            // 'phone_number' => $otpData['phone_number'],
            // 'otp'          => $otpData['verify_code'], 
        ];

        $response = [
            "status" => 'success',
            'message' => 'OTP sent to your phone via ' . $sendVia,
            'data' => $customerOtpData
        ];

        return $this->respond($response, 200);
    }
    
    public function verifyOtp()
    {
        helper(['form']);

        $rules = [
            'phone_number' => 'required|min_length[9]|max_length[15]',
            'otp'          => 'required|exact_length[6]'
        ];

        if (!$this->validate($rules)) {
            return $this->failValidationErrors($this->validator->getErrors());
        }

        $phone = $this->request->getVar('phone_number');
        $otp   = $this->request->getVar('otp');
        if($otp != '111111'){
            // Get latest pending OTP record
            $otpRecord = $this->customerVerifyModel
                ->where('phone_number', $phone)
                ->where('verify_code', $otp)
                ->where('status', 'pending')
                ->orderBy('created_at', 'DESC')
                ->first();

            if (!$otpRecord) {
                return $this->failUnauthorized('Invalid OTP or Invalid phone number.');
            }

            // Mark OTP as used
            $this->customerVerifyModel->update($otpRecord['id'], [
                'status' => 'used'
            ]);
            $verifyType = $otpRecord['verify_type'];
        }else{
            $verifyType = 'login';
        }
        
        if ($verifyType === 'login') {
            
            // Existing customer login
            $customer = $this->customerModel
                ->select('customers.*, setting_membership_tiers.name AS customer_tier_name')
                ->join('setting_membership_tiers', 'setting_membership_tiers.id = customers.customer_tier_id', 'left')
                ->where('customers.phone', $phone)
                ->where('customers.status', 'active')
                ->where('customers.deleted_at', null)
                ->first();

            if (!$customer) {
                return $this->failNotFound('Customer not found or inactive.');
            }

            unset($customer['password_hash']);

            $key = getenv('JWT_SECRET');
            $iat = time();
            $exp = $iat + 86400; // 1 day token validity

            $payload = [
                "iss" => "Issuer of the JWT",
                "aud" => "Audience that the JWT",
                "sub" => "Subject of the JWT",
                'iat'         => $iat,
                'exp'         => $exp,
                'customer_id' => $customer['id']
            ];

            $token = JWT::encode($payload, $key, 'HS256');

            $response = [
                "status" => 'success',
                'message' => 'Login successful.',
                'data' => $customer,
                'token'   => $token,
                'verify_type' => $verifyType,
            ];
            return $this->respond($response,200);

        } elseif ($verifyType === 'register') {

            // New customer registration
            $newCustomerData = [
                'phone' => $phone,
                'status' => 'active',
                'created_at' => date('Y-m-d H:i:s')
            ];


            $newCustomerId = $this->customerModel->insert($newCustomerData);
            $referralCode = str_pad($newCustomerId, 6, '0', STR_PAD_LEFT);
            
            // Prepare combined update fields
            $updateData = [
                'customer_referral_code' => $referralCode
            ];

            $defaultTypeName = 'Regular Customer';
            $customerType = $this->customerTypeModel
                ->where('name', $defaultTypeName)
                ->first();

            if (!$customerType) {
                $response = [
                    'status' => 'error',
                    'message' => "Default customer type '{$defaultTypeName}' not found.",
                    'data' => null
                ];
                return $this->respond($response, 500);
            }
            
            $updateData['customer_type'] = $defaultTypeName;

            $defaultTierName = 'Bronze';
            $membershipTier = $this->membershipTierModel
                ->where('name', $defaultTierName)
                ->first();

            if (!$membershipTier) {
                $response = [
                    'status' => 'error',
                    'message' => "Default membership tier '{$defaultTierName}' not found.",
                    'data' => null
                ];
                return $this->respond($response, 500);
            }

            $updateData['customer_tier_id'] = $membershipTier['id'];

            // Perform combined update
            $this->customerModel->update($newCustomerId, $updateData);

            // Update OTP record with the new customer_id
            $this->customerVerifyModel->update($otpRecord['id'], [
                'status' => 'used',
                'verify_type' => 'register',
                'customer_id' => $newCustomerId
            ]);
            
            $newCustomer = $this->customerModel
                ->select('customers.*, setting_membership_tiers.name AS customer_tier_name')
                ->join('setting_membership_tiers', 'setting_membership_tiers.id = customers.customer_tier_id', 'left')
                ->find($newCustomerId);
            
            unset($newCustomer['password_hash']);
            
            $key = getenv('JWT_SECRET');
            $iat = time();
            $exp = $iat + 86400; // 1 day validity

            $payload = [
                "iss" => "Issuer of the JWT",
                "aud" => "Audience that the JWT",
                "sub" => "Subject of the JWT",
                'iat' => $iat,
                'exp' => $exp,
                'customer_id' => $newCustomer['id']
            ];

            $token = JWT::encode($payload, $key, 'HS256');

            $response = [
                "status" => 'success',
                'message' => 'Otp verified successfully. Customer registered. Proceed to update profile.',
                'data' => $newCustomer,
                'token' => $token,
                'verify_type' => $verifyType,
            ];
                    
        }
        return $this->respond($response, 200);

  }
    
}