<?php

namespace App\Form\Model;

use App\BusProNet\Model\Address;
use App\BusProNet\Model\Insurance;
use App\BusProNet\Model\PersonalData;
use App\BusProNet\Model\Pickup;
use App\BusProNet\Model\PromoVoucher;
use App\BusProNet\Model\PurchaseVoucher;
use App\BusProNet\Model\Service;
use App\Validator\Constraints as AppAssert;
use Symfony\Component\Validator\Constraints as Assert;
use Symfony\Component\Validator\Context\ExecutionContextInterface;

#[AppAssert\Participant(groups: ['booking_edit', 'booking_create'])]
class ParticipantDto
{
    /**
     * List of dynamic participant fields that can be conditionally hidden/shown.
     */
    public const DYNAMIC_FIELDS = [
        'assignedRoomId',
        'remarksRoom',
        'courses',
        'additionalServices',
        'board',
        'rentals',
        'rentalInsurance',
        'skiPass',
        'transportationOutbound',
        'transportationInbound',
        'pickup',
        'parking',
        'licensePlate',
        'bulkInsuranceBooking',
        'insurance',
        'purchaseVoucherCode',
        'promoVoucherCode',
    ];

    public ?int $index = null;
    public ?int $addressId = null;
    public ?int $personId = null;
    public ?string $status = null;
    public bool $mutable = false;
    public bool $touched = false;

    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
    public ?string $firstName = null;

    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
    public ?string $lastName = null;
    public ?string $title = null;
    public ?string $gender = null;
    public ?string $nationality = null;

    public ?string $height = null;
    public ?string $shoeSize = null;
    public ?string $weight = null;

    #[Assert\NotNull(message: 'Bitte angeben', groups: ['strict_required'])]
    public ?\DateTimeImmutable $dateOfBirth = null;

    #[Assert\Email(message: 'Bitte eine gültige E-Mail Adresse angeben', mode: 'strict', groups: ['booking_edit', 'booking_create'])]
    #[Assert\NotBlank(message: 'Bitte angeben', groups: ['strict_required'])]
    public ?string $email = null;

    public ?string $mobile = null;

    #[Assert\Valid(groups: ['booking_edit', 'booking_create'])]
    #[Assert\NotNull(message: 'Bitte Adresse angeben', groups: ['applicant_address'])]
    public ?Address $address = null;

    #[Assert\NotNull(message: 'Bitte ein Zimmer auswählen', groups: ['strict_required'])]
    public ?int $assignedRoomId = null;

    public ?string $remarksRoom = null;

    public array $courses = [];
    public array $additionalServices = [];

    // Note: Ski pass validation is conditional - see ParticipantEditDto::validateSkiPassRequired()
    // Babies (0-2 years) are exempt from ski pass requirement
    public ?Service $skiPass = null;

    public array $board = [];
    public array $rentals = [];
    public ?Service $rentalInsurance = null;

    // Rental insurance checkbox state (boolean: true if rental insurance requested)
    public bool $rentalInsuranceSelected = false;

    // Transportation services with improved naming (outbound/inbound)
    #[Assert\NotNull(message: 'Bitte auswählen', groups: ['strict_required'])]
    public ?Service $transportationOutbound = null;
    #[Assert\NotNull(message: 'Bitte auswählen', groups: ['strict_required'])]
    public ?Service $transportationInbound = null;

    // Pickup location (applies to both directions)
    public ?Pickup $pickup = null;

    // Parking service for self-organized transportation (boolean: true if parking requested)
    public bool $parking = false;

    // Parking service object for pricing calculation (new, contains actual service with pricing)
    public ?Service $parkingService = null;

    // License plate for participants with parking (optional, visible only when parking is selected)
    public ?string $licensePlate = null;

    // Selected insurance for this participant (individual insurance selection per participant)
    // Note: Insurance validation is conditional - see ParticipantEditDto::validateInsuranceRequired()
    public ?Insurance $insurance = null;

    // Bulk insurance booking flag (applicant only: when checked, assigns same insurance type to all participants)
    public bool $bulkInsuranceBooking = false;

    /**
     * Purchase voucher redemption code.
     * Collected from all participants and aggregated into single <gutscheine> collection in booking payload.
     */
    #[Assert\Length(
        max: 50,
        maxMessage: 'Der Gutscheincode darf maximal {{ limit }} Zeichen lang sein'
    )]
    #[Assert\Regex(
        pattern: '/^[A-Za-z0-9\-]+$/',
        message: 'Der Gutscheincode darf nur Buchstaben, Zahlen und Bindestriche enthalten'
    )]
    public ?string $purchaseVoucherCode = null;

    /**
     * Validated purchase voucher from API.
     * Set by ParticipantPurchaseVoucherFieldHandler during form processing.
     * Contains voucher number, remaining balance, and type (Kauf/Kulanz).
     */
    public ?PurchaseVoucher $validatedPurchaseVoucher = null;

    /**
     * Promo voucher code.
     * Applied per participant in booking payload as <aktionscode>.
     */
    #[Assert\Length(
        max: 50,
        maxMessage: 'Der Aktionscode darf maximal {{ limit }} Zeichen lang sein'
    )]
    #[Assert\Regex(
        pattern: '/^[A-Za-z0-9\-]+$/',
        message: 'Der Aktionscode darf nur Buchstaben, Zahlen und Bindestriche enthalten'
    )]
    public ?string $promoVoucherCode = null;

    /**
     * Validated promo voucher from API.
     * Set by ParticipantPromoVoucherFieldHandler during form processing.
     * Contains discount amount/percentage and applicability (per person/booking).
     */
    public ?PromoVoucher $validatedPromoVoucher = null;

    /**
     * @var array<array{type: string, message: string}> Notification messages for user feedback
     */
    public array $notifications = [];

    public function __construct()
    {
        $this->address = new Address();
    }

    public static function fromPersonalData(PersonalData $personalData): static
    {
        $instance = new static();

        $instance->status = $personalData->status;
        $instance->addressId = $personalData->addressId;
        $instance->personId = $personalData->personId;
        $instance->mutable = $personalData->mutable;
        $instance->firstName = $personalData->firstName;
        $instance->lastName = $personalData->name;
        $instance->title = $personalData->title;
        $instance->gender = $personalData->gender;
        $instance->nationality = $personalData->nationality;
        $instance->email = $personalData->communication?->email;
        $instance->mobile = $personalData->communication?->mobile;
        $instance->dateOfBirth = $personalData->dateOfBirth;
        $instance->height = $personalData->height;
        $instance->weight = $personalData->weight;
        $instance->shoeSize = $personalData->shoeSize;

        // Clone address to prevent shared object references that could cause mutations
        $instance->address = null !== $personalData->address ? clone $personalData->address : null;

        $instance->remarksRoom = $personalData->remarksRoom;
        $instance->licensePlate = $personalData->licensePlate;

        return $instance;
    }

    public function isApplicant(): bool
    {
        return 0 === $this->index;
    }

    public function isCanceled(): bool
    {
        return 'S' === $this->status;
    }

    /**
     * Checks if participant status is 'Option' (O).
     */
    public function isOption(): bool
    {
        return 'O' === $this->status;
    }

    /**
     * Calculates the participant's age in complete years.
     *
     * Uses the same logic as existing age evaluators in the system
     * for consistency across age-related calculations.
     *
     * @param \DateTimeImmutable|null $referenceDate The date to calculate age at (defaults to current date)
     *
     * @return int|null The calculated age in complete years, or null if no birth date
     */
    public function getAge(?\DateTimeImmutable $referenceDate = null): ?int
    {
        if (null === $this->dateOfBirth) {
            return null;
        }

        $referenceDate = $referenceDate ?? new \DateTimeImmutable();

        return $this->dateOfBirth->diff($referenceDate)->y;
    }

    /**
     * Checks if the participant has selected an insurance.
     */
    public function hasInsuranceSelected(): bool
    {
        return null !== $this->insurance;
    }

    /**
     * Gets the insurance label for display purposes.
     */
    public function getInsuranceLabel(): ?string
    {
        return $this->insurance?->label;
    }

    /**
     * Gets the insurance price for pricing calculations.
     */
    public function getInsurancePrice(): float
    {
        return $this->insurance?->price ?? 0.0;
    }

    /**
     * Adds a notification message for user feedback.
     *
     * Uses an optional ID to prevent duplicate notifications. If no ID is provided,
     * generates one from the type and message combination. Duplicate IDs will
     * overwrite previous notifications, ensuring each unique notification appears once.
     *
     * @param string      $type    The notification type (info, warning, success)
     * @param string      $message The notification message
     * @param string|null $id      Optional unique identifier (auto-generated if null)
     */
    public function addNotification(string $type, string $message, ?string $id = null): void
    {
        // Generate ID from type and message if not provided
        $notificationId = $id ?? md5($type.'_'.$message);

        // Use ID as key to automatically prevent duplicates
        $this->notifications[$notificationId] = [
            'type' => $type,
            'message' => $message,
        ];
    }

    /**
     * Checks if this participant has a goodwill (Kulanz) voucher.
     *
     * Goodwill vouchers are treated as promotional vouchers in BPN XML
     * (sent as <aktionscode> per participant, not in <gutscheine> collection).
     */
    public function hasGoodwillVoucher(): bool
    {
        return null !== $this->validatedPurchaseVoucher
            && $this->validatedPurchaseVoucher->isGoodwill();
    }

    /**
     * Determines if the participant is a child based on age at current date.
     *
     * A child is defined as someone under the specified age threshold (default: 16 years).
     * This classification is used for email uniqueness validation (children can share emails with adults).
     *
     * @param int $ageThreshold The age threshold for child classification (default: 16)
     *
     * @return bool True if participant is under the age threshold, false otherwise or if age unknown
     */
    public function isChild(int $ageThreshold = 16): bool
    {
        $age = $this->getAge();

        // Treat unknown age as adult for safety (requires email uniqueness)
        if (null === $age) {
            return false;
        }

        return $ageThreshold > $age;
    }

    /**
     * Validates that the applicant (index 0) has a complete address.
     *
     * This callback only applies to the applicant participant. Address validation includes:
     * - Address object must exist
     * - All required address fields must be filled (street, postCode, city, country)
     */
    #[Assert\Callback(groups: ['strict_required'])]
    public function validateApplicantAddress(ExecutionContextInterface $context): void
    {
        // Only validate applicant's address
        if (0 !== $this->index) {
            return;
        }

        // Address object is required for applicant
        if (null === $this->address) {
            $context->buildViolation('Bitte angeben')
                ->atPath('address')
                ->addViolation();

            return;
        }

        // Validate address subfields
        if (null === $this->address->street || '' === trim($this->address->street)) {
            $context->buildViolation('Bitte angeben')
                ->atPath('address.street')
                ->addViolation();
        }

        if (null === $this->address->postCode || '' === trim($this->address->postCode)) {
            $context->buildViolation('Bitte angeben')
                ->atPath('address.postCode')
                ->addViolation();
        }

        if (null === $this->address->city || '' === trim($this->address->city)) {
            $context->buildViolation('Bitte angeben')
                ->atPath('address.city')
                ->addViolation();
        }

        if (null === $this->address->country || '' === trim($this->address->country)) {
            $context->buildViolation('Bitte angeben')
                ->atPath('address.country')
                ->addViolation();
        }
    }
}