<?php

namespace App\Models;

use App\Support\ChannelEntryEncryption;
use Illuminate\Database\Eloquent\Factories\HasFactory;
use Illuminate\Database\Eloquent\Model;
use Illuminate\Database\Eloquent\Relations\BelongsTo;
use Illuminate\Database\Eloquent\Relations\HasMany;
use Illuminate\Support\Str;

class SignupChannel extends Model
{
    use HasFactory;

    public const STATUS_ENABLED = 'enabled';

    public const STATUS_DISABLED = 'disabled';

    public const STATUSES = [
        self::STATUS_ENABLED,
        self::STATUS_DISABLED,
    ];

    protected $fillable = [
        'competition_id',
        'channel_name',
        'status',
        'shared_secret',
        'encryption_algorithm',
        'entry_encryption_enabled',
        'encryption_public_key',
        'encryption_private_key',
        'success_callback_url',
        'remark',
    ];

    protected $hidden = [
        'shared_secret',
        'encryption_private_key',
    ];

    protected $casts = [
        'entry_encryption_enabled' => 'boolean',
        'encryption_private_key' => 'encrypted',
    ];

    protected static function booted(): void
    {
        static::creating(function (SignupChannel $channel): void {
            $channel->ensureEncryptionKeyPair();

            if ($channel->channel_code !== null && $channel->channel_code !== '') {
                return;
            }

            do {
                $channel->channel_code = (string) Str::ulid();
            } while (static::query()->where('channel_code', $channel->channel_code)->exists());
        });
    }

    public function ensureEncryptionKeyPair(): void
    {
        if (trim((string) $this->encryption_public_key) !== ''
            && trim((string) $this->encryption_private_key) !== '') {
            return;
        }

        $keys = ChannelEntryEncryption::generateKeyPair();
        $this->encryption_algorithm = ChannelEntryEncryption::ALGORITHM;
        $this->encryption_public_key = $keys['public_key'];
        $this->encryption_private_key = $keys['private_key'];
    }

    public function competition(): BelongsTo
    {
        return $this->belongsTo(Competition::class);
    }

    public function firstSourceUsers(): HasMany
    {
        return $this->hasMany(User::class, 'first_channel_id');
    }

    public function lastSourceUsers(): HasMany
    {
        return $this->hasMany(User::class, 'last_channel_id');
    }

    public function applications(): HasMany
    {
        return $this->hasMany(Application::class, 'signup_channel_id');
    }
}