public function up()

in database/migrations/2017_12_04_165421_move_ages_data.php [14:122]
96 lines of code
11 McCabe index (conditional complexity)

    public function up()
    {
        $contacts = DB::table('contacts')->select('account_id', 'id', 'first_name', 'is_birthdate_approximate', 'birthdate', 'birthday_reminder_id', 'first_met', 'deceased_date')->get();

        foreach ($contacts as $contact) {
            $specialDateDeceasedDateId = null;
            $specialDateBirthdateId = null;
            $specialDateFirstMetDateId = null;

            if ($contact->deceased_date) {
                $specialDateDeceasedDateId = DB::table('special_dates')->insertGetId([
                    'account_id' => $contact->account_id,
                    'contact_id' => $contact->id,
                    'is_age_based' => false,
                    'date' => $contact->deceased_date,
                    'reminder_id' => null,
                    'created_at' => now(),
                ]);
            }

            $isBirthdayApproximate = $contact->is_birthdate_approximate;

            if ($contact->birthdate) {
                switch ($isBirthdayApproximate) {
                    case 'unknown':
                        break;
                    case 'approximate':
                        $specialDateBirthdateId = DB::table('special_dates')->insertGetId([
                            'account_id' => $contact->account_id,
                            'contact_id' => $contact->id,
                            'is_age_based' => true,
                            'date' => $contact->birthdate,
                            'reminder_id' => $contact->birthday_reminder_id,
                            'created_at' => now(),
                        ]);

                        break;
                    case 'exact':
                        $specialDateBirthdateId = DB::table('special_dates')->insertGetId([
                            'account_id' => $contact->account_id,
                            'contact_id' => $contact->id,
                            'is_age_based' => false,
                            'date' => $contact->birthdate,
                            'reminder_id' => $contact->birthday_reminder_id,
                            'created_at' => now(),
                        ]);

                        break;
                }
            }

            if ($contact->first_met) {
                $specialDateFirstMetDateId = DB::table('special_dates')->insertGetId([
                    'account_id' => $contact->account_id,
                    'contact_id' => $contact->id,
                    'is_age_based' => false,
                    'date' => $contact->first_met,
                    'reminder_id' => null,
                    'created_at' => now(),
                ]);
            }

            if ($contact->birthdate && $specialDateBirthdateId) {
                // is title field null? If so, that means it's a birthdate and we need to populate the title field with a title
                $reminder = DB::table('reminders')->where('id', $contact->birthday_reminder_id)
                                                  ->select('title')
                                                  ->get();

                if ($reminder->isEmpty()) {
                    DB::table('reminders')
                            ->where('id', $contact->birthday_reminder_id)
                            ->update([
                                'special_date_id' => $specialDateBirthdateId,
                            ]);
                } else {
                    DB::table('reminders')
                            ->where('id', $contact->birthday_reminder_id)
                            ->update([
                                'special_date_id' => $specialDateBirthdateId,
                                'title' => 'Wish happy birthday to '.$contact->first_name,
                            ]);
                }
            }

            DB::table('contacts')
                    ->where('id', $contact->id)
                    ->update([
                        'deceased_special_date_id' => $specialDateDeceasedDateId,
                        'birthday_special_date_id' => $specialDateBirthdateId,
                        'first_met_special_date_id' => $specialDateFirstMetDateId,
                    ]);
        }

        Schema::table('contacts', function ($table) {
            $table->dropColumn([
                'deceased_date',
                'first_met',
                'birthdate',
                'is_birthdate_approximate',
                'birthday_reminder_id',
            ]);
        });

        Schema::table('reminders', function ($table) {
            $table->dropColumn([
                'is_birthday',
            ]);
        });
    }