<?php

namespace App\Models;

use App\Jobs\SetServiceStats;
use App\Lib\Helper;
use App\Traits\Models\ActivityLog;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\ModelNotFoundException;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Cache;
use Illuminate\Support\Facades\Crypt;
use Illuminate\Support\Facades\Hash;
use Illuminate\Support\Str;

/**
 * @property integer                         $id                Id.
 * @property integer                         $brand_id          Foreign key Brand.
 * @property string                          $name              Nom.
 * @property string                          $bearer_token
 * @property string                          $bearer_pwd
 * @property \Carbon\Carbon                  $bearer_token_date
 * @property-read \Illuminate\Support\Carbon $created_at        Created date.
 * @property-read \Illuminate\Support\Carbon $updated_at        Updated date.
 *
 * @property-read \App\Models\Brand    $brand Brand BelongsTo relation.
 * @property-read \Illuminate\Database\Eloquent\Collection<App\Models\ServiceStat>
 * $servicesStats ServiceStat HasMany relation.
 */
class Service extends Model
{
    use ActivityLog;
    use HasFactory;

    /**
     * The attributes that are mass assignable.
     *
     * @var array<int, string>
     */
    protected $fillable = [
        'name',
        'brand_id',
    ];

    /**
     * The attributes that should be cast to native types.
     *
     * @var array<string, mixed>
     */
    protected $casts = [
        'bearer_token_date' => 'datetime',
    ];

    /**
     * Perform any actions required after the model boots.
     *
     * @return void
     */
    protected static function booted(): void
    {
        static::creating(function (self $model) {
            if (config('app.env') !== 'production') {
                $model->generateBearerToken();
                $model->generateBearerPassword();
            }
        });
        static::created(function () {
            self::resetCache();
        });
        static::updated(function () {
            self::resetCache();
        });
        static::deleted(function () {
            self::resetCache();
        });
    }

    // * RELATIONS

    /**
     * Brand belongs to relation.
     *
     * @return \Illuminate\Database\Eloquent\Relations\BelongsTo
     */
    public function brand(): \Illuminate\Database\Eloquent\Relations\BelongsTo
    {
        return $this->belongsTo(Brand::class);
    }

    /**
     * ServiceStat has many relation.
     *
     * @return \Illuminate\Database\Eloquent\Relations\HasMany
     */
    public function servicesStats(): \Illuminate\Database\Eloquent\Relations\HasMany
    {
        return $this->hasMany(ServiceStat::class);
    }

    // * METHODS

    /**
     * Generates new bearer token.
     *
     * @return string
     */
    public function generateBearerToken(): string
    {
        $this->bearer_token      = hash('ripemd160', Str::uuid());
        $this->bearer_token_date = now();
        return $this->bearer_token;
    }

    /**
     * Generates new bearer password
     * It store the crypted password in model
     * and returns the plain password.
     *
     * @return string
     */
    public function generateBearerPassword(): string
    {
        $pwd              = hash('sha256', Str::uuid());
        $this->bearer_pwd = Crypt::encryptString($pwd);
        return $pwd;
    }

    /**
     * Increment API CRM Stat.
     *
     * @return void
     */
    public function incrementStat(): void
    {
        SetServiceStats::dispatch($this)->afterResponse()
            ->onConnection('database')->onQueue('stats');
    }

    /**
     * Get Service from bearerToken with its brand.
     *
     * @param string $bearerToken
     * @return \App\Models\Service
     * @throws \Illuminate\Database\Eloquent\ModelNotFoundException If the token matches no known service.
     */
    public static function getFromBearerToken(string $bearerToken): self
    {
        $service = static::getServices()->first(function ($service) use ($bearerToken) {
            if (! $service->bearer_token) {
                return false;
            }

            return !Hash::needsRehash($bearerToken)
                ? Hash::check($bearerToken, $service->bearer_token)
                : $bearerToken === $service->bearer_token;
        });

        if (! $service) {
            throw new ModelNotFoundException('Could not find service from Service Token');
        }

        return $service->load('brand');
    }

    /**
     * Authenticate the request for this service
     *
     * This will check hash-mac and that the request is wellformed
     *
     * The request should have the minimum following parameters
     *  - timestamp using format Y-m-d H:i:s, and must be UTC (Greenwich Mean Time)
     *  - bearerToken the public token generated by the crm
     *  - signature the hashmac signature of the request
     *
     * ! Signature must be calculated with every parameter urlencode once only
     * ! All parameters to calculate the signature must be sorted (natural sort asc)
     *
     * ! Signature should look like
     * * httpVerb\n
     * * uri\n
     * * queryString
     *
     * ! httpVerb as well as uri must be lower case
     * ! uri should include scheme, host and path and nothing else, if path is empty a trailing slash should be added
     * ! eg: https://ldc-crm.fr/customer/1  or  https://ldc-crm.fr/
     * ! The query string shall be separated with '&', eg param1=value1&param2=value2
     * ! Key names and values of the query string must be url encoded using RFC 3986
     * ! http://www.faqs.org/rfcs/rfc3986.html
     * ! Signature must be hmac sha256 using the private key generatedby the crm
     *
     *     * ! They should then be concat in a string separated by \n
     *
     * @param \Illuminate\Http\Request $request
     * @return boolean
     * @throws \App\Exceptions\Api\V4\CrmException If an error occurs.
     */
    public function authenticateApi(Request $request): bool
    {
        // ! Hack to prevent Laravel to cast empty strings to null or the opposite.
        // ! If cannot decode json user legacy all() method.
        $data = \json_decode($request->getContent(), true);
        $data = (\is_array($data) and \json_last_error() === \JSON_ERROR_NONE) ?
            array_replace_recursive($request->all(), $data) : $request->all();

        $calculatedHash = Helper::signRequest(
            $this->bearer_pwd,
            $request->getUri(),
            $request->getMethod(),
            $data
        );

        // ! Très important hash_equals https://fr.wikipedia.org/wiki/Attaque_temporelle
        return \hash_equals($calculatedHash, $request->signature);
    }

    /**
     * Reset all cache elements related to this model.
     *
     * @return void
     */
    private static function resetCache(): void
    {
        Cache::forget('services');
        self::getServices();
    }

    /**
     * Get all services.
     *
     * @return \Illuminate\Database\Eloquent\Collection
     */
    public static function getServices(): \Illuminate\Database\Eloquent\Collection
    {
        return Cache::remember('services', 86400, function () {
            return self::query()->orderBy('name', 'ASC')->get();
        });
    }
}