<?php

class ApexModel {
    private $start_date;
    private $end_date;
    private $country;
    private $program_id;
    private $purpose_id;
    private $group_id;
    private $person_info;

    public function __construct($start_date, $end_date, $country, $program_id, $purpose_id, $group_id, $person_info) {
        $this->setStartDate($start_date);
        $this->setEndDate($end_date);
        $this->setCountry($country);
        $this->setProgramId($program_id);
        $this->setPurposeId($purpose_id);
        $this->setGroupId($group_id);
        $this->setPersonInfo($person_info);
    }

    public function setStartDate($start_date) {
        if ($this->validateDate($start_date)) {
            $this->start_date = $start_date;
        } else {
            throw new Exception("Invalid start_date format");
        }
    }

    public function setEndDate($end_date) {
        if ($this->validateDate($end_date)) {
            $this->end_date = $end_date;
        } else {
            throw new Exception("Invalid end_date format");
        }
    }

    public function setCountry($country) {
        if (is_array($country)) {
            $this->country = $country;
        } else {
            throw new Exception("Country must be an array");
        }
    }

    public function setProgramId($program_id) {
        if (is_int($program_id)) {
            $this->program_id = $program_id;
        } else {
            throw new Exception("Invalid program_id format");
        }
    }

    public function setPurposeId($purpose_id) {
        if (is_int($purpose_id)) {
            $this->purpose_id = $purpose_id;
        } else {
            throw new Exception("Invalid purpose_id format");
        }
    }

    public function setGroupId($group_id) {
        if (is_int($group_id)) {
            $this->group_id = $group_id;
        } else {
            throw new Exception("Invalid group_id format");
        }
    }

    public function setPersonInfo($person_info) {
        if (is_array($person_info)) {
            foreach ($person_info as $person) {
                if (!isset($person['birthday']) || !$this->validateDate($person['birthday'])) {
                    throw new Exception("Invalid person_info data");
                }
            }
            $this->person_info = $person_info;
        } else {
            throw new Exception("Invalid person_info format");
        }
    }

    private function validateDate($date) {
        $d = DateTime::createFromFormat('d.m.Y', $date);
        return $d && $d->format('d.m.Y') === $date;
    }

    public function getStartDate() {
        return $this->start_date;
    }

    public function getEndDate() {
        return $this->end_date;
    }

    public function getCountry() {
        return $this->country;
    }

    public function getProgramId() {
        return $this->program_id;
    }

    public function getPurposeId() {
        return $this->purpose_id;
    }

    public function getGroupId() {
        return $this->group_id;
    }

    public function getPersonInfo() {
        return $this->person_info;
    }
}