<?php

declare(strict_types=1);

namespace Yatra\Models;

/**
 * Checkout Model
 * 
 * Encapsulates all checkout/booking data and provides clean getter methods
 * for templates to access pricing, trip, traveler, and discount information.
 * 
 * @package Yatra\Models
 * @since 3.0.0
 */
class Checkout
{
    private \stdClass $trip;
    private array $session;
    private array $pricingCalculation;
    private array $taxCalculation;
    
    public function __construct(\stdClass $trip, array $session, array $pricingCalculation)
    {
        $this->trip = $trip;
        $this->session = $session;
        $this->pricingCalculation = $pricingCalculation;
        $this->taxCalculation = $pricingCalculation['tax_calculation'] ?? [
            'enable_tax' => false,
            'tax_breakdown' => [],
            'total_tax_amount' => 0,
            'tax_inclusive' => false,
        ];
    }
    
    // ========== Trip Information ==========
    
    public function getTrip(): \stdClass
    {
        return $this->trip;
    }
    
    public function getTripId(): int
    {
        return (int) $this->trip->id;
    }
    
    public function getTripName(): string
    {
        return $this->trip->name ?? '';
    }
    
    public function getTravelDate(): string
    {
        return $this->session['travel_date'] ?? '';
    }
    
    public function getDepartureTime(): string
    {
        return $this->session['departure_time'] ?? '';
    }
    
    // ========== Pricing Type & Travelers ==========
    
    public function getPricingType(): string
    {
        return $this->session['pricing_type'] ?? 'regular';
    }
    
    public function isTravelerBased(): bool
    {
        return $this->getPricingType() === 'traveler_based';
    }
    
    public function getTotalTravelers(): int
    {
        return (int) ($this->session['travelers'] ?? 1);
    }
    
    public function getTravelerCounts(): array
    {
        return $this->session['traveler_counts'] ?? [];
    }
    
    public function getPriceTypes(): array
    {
        return $this->session['price_types'] ?? [];
    }
    
    public function getCategoryBreakdown(): array
    {
        if (!$this->isTravelerBased() || empty($this->getPriceTypes())) {
            return [];
        }

        $breakdown = [];
        $priceTypes = $this->getPriceTypes();
        $travelerCounts = $this->getTravelerCounts();

        // CalculationService now ships a per-category map of DP-adjusted unit
        // prices. When present, we prefer it so the category row in the sidebar
        // shows the price the customer is actually paying (e.g. Adult $157.52)
        // instead of the pre-DP catalog price plus a separate "Dynamic
        // Pricing −$21.48" subtraction line. The fallback keeps working for
        // entry points (e.g. legacy sessions, partial recalcs) that don't
        // carry this map.
        $postDpPrices = isset($this->pricingCalculation['category_prices_post_dp'])
            && is_array($this->pricingCalculation['category_prices_post_dp'])
                ? $this->pricingCalculation['category_prices_post_dp']
                : [];

        // If the session carries explicit per-category counts, trust them
        // verbatim. The previous "first category defaults to 1 when missing"
        // fallback fired even alongside a real traveler_counts payload, which
        // double-counted: e.g. with `{"53": 1}` (1 Senior) the Adult row at
        // index 0 was getting a phantom +1, so the sidebar showed two
        // travelers when the customer had picked one.
        $hasExplicitCounts = is_array($travelerCounts) && !empty($travelerCounts);

        foreach ($priceTypes as $index => $pt) {
            $pt = (object) $pt;
            $categoryId = $pt->category_id ?? $index;
            $categoryLabel = $pt->category_label ?? __('Traveler', 'yatra');
            $catalogPrice = isset($pt->effective_price)
                ? (float) $pt->effective_price
                : \Yatra\Services\TripPricingService::resolveCategoryEffectivePrice((array) $pt);

            // Prefer DP-adjusted price (post-rules) when present.
            $categoryPrice = isset($postDpPrices[(string) $categoryId])
                ? (float) $postDpPrices[(string) $categoryId]
                : $catalogPrice;

            if ($hasExplicitCounts) {
                $count = isset($travelerCounts[$categoryId]) ? (int) $travelerCounts[$categoryId] : 0;
            } else {
                // No per-category data at all (legacy session shape) — keep the
                // old "default first category to 1" so empty sessions still
                // render a sensible single-traveler row.
                $count = $index === 0 ? 1 : 0;
            }

            if ($count > 0) {
                $breakdown[] = [
                    'category_id' => $categoryId,
                    'label' => $categoryLabel,
                    'count' => $count,
                    'price' => $categoryPrice,
                    // The non-DP price stays available so the template can
                    // optionally render strike-through original pricing if it
                    // wants to highlight savings — but the default render is
                    // the post-DP price baked in here.
                    'catalog_price' => $catalogPrice,
                    // Single source of truth for the line amount: per-person ×
                    // count, flat per-group, or per-block group pricing. Keeps
                    // the breakdown row in lock-step with the charged total.
                    'subtotal' => \Yatra\Services\TripPricingService::categoryLineSubtotal($pt, $count, $categoryPrice),
                    'pricing_mode' => $pt->pricing_mode ?? 'per_person',
                ];
            }
        }

        return $breakdown;
    }
    
    // ========== Pricing Amounts ==========
    
    public function getPricePerPerson(): float
    {
        // Use unit_price from pricing calculation, or fallback to trip's discounted/original price
        if (isset($this->pricingCalculation['unit_price']) && $this->pricingCalculation['unit_price'] > 0) {
            return (float) $this->pricingCalculation['unit_price'];
        }
        
        // Fallback to trip pricing via centralized TripPricingService
        return \Yatra\Services\TripPricingService::resolveRegularCurrentPrice($this->trip);
    }
    
    public function getBaseAmount(): float
    {
        return (float) ($this->pricingCalculation['base_amount'] ?? 0);
    }
    
    public function getGrossTotal(): float
    {
        return (float) ($this->pricingCalculation['gross_total'] ?? $this->getBaseAmount());
    }
    
    public function getSubtotal(): float
    {
        return $this->getGrossTotal();
    }
    
    public function getNetTotal(): float
    {
        return (float) ($this->pricingCalculation['final_total'] ?? 0);
    }
    
    public function getFinalTotal(): float
    {
        return $this->getNetTotal();
    }
    
    public function getAmountDue(): float
    {
        return (float) ($this->pricingCalculation['amount_due'] ?? $this->getNetTotal());
    }
    
    // ========== Discounts ==========
    
    public function getGroupDiscount(): ?array
    {
        $discount = $this->pricingCalculation['group_discount'] ?? null;
        if (empty($discount) || empty($discount['amount'])) {
            return null;
        }
        return $discount;
    }
    
    public function getGroupDiscountAmount(): float
    {
        $discount = $this->getGroupDiscount();
        return $discount ? (float) ($discount['amount'] ?? 0) : 0.0;
    }
    
    public function getGroupDiscountLabel(): string
    {
        $discount = $this->getGroupDiscount();
        return $discount ? ($discount['label'] ?? __('Group Discount', 'yatra')) : '';
    }
    
    public function getCouponDiscount(): ?array
    {
        $discount = $this->pricingCalculation['coupon_discount'] ?? null;
        if (empty($discount) || empty($discount['calculated_amount'])) {
            return null;
        }
        return $discount;
    }
    
    public function getCouponDiscountAmount(): float
    {
        $discount = $this->getCouponDiscount();
        return $discount ? (float) ($discount['calculated_amount'] ?? 0) : 0.0;
    }
    
    public function getCouponDiscountLabel(): string
    {
        $discount = $this->getCouponDiscount();
        return $discount ? ($discount['label'] ?? __('Coupon Discount', 'yatra')) : '';
    }
    
    public function getCouponCode(): string
    {
        $discount = $this->getCouponDiscount();
        return $discount ? ($discount['code'] ?? '') : '';
    }
    
    public function hasCoupon(): bool
    {
        return !empty($this->getCouponCode());
    }
    
    public function getTotalDiscountAmount(): float
    {
        return $this->getGroupDiscountAmount() + $this->getCouponDiscountAmount();
    }

    // ========== Dynamic Pricing ==========
    //
    // These accessors expose the dynamic-pricing breakdown that CalculationService
    // collects via the `yatra_price_breakdown` filter. The pricing-summary
    // template uses them to render a "Dynamic Pricing" line item with the
    // original price, applied rules, and savings, rather than silently folding
    // the adjustment into the trip subtotal.

    public function getDynamicPricing(): ?array
    {
        $dp = $this->pricingCalculation['dynamic_pricing'] ?? null;
        if (!is_array($dp) || empty($dp['rules'])) {
            return null;
        }
        return $dp;
    }

    public function hasDynamicPricing(): bool
    {
        return $this->getDynamicPricing() !== null;
    }

    /**
     * Total dollar impact dynamic pricing has on the booking. Negative means
     * a discount, positive means a markup. For traveler-based trips the DP
     * filter fires per-category so we don't have a single per-unit delta; in
     * that case fall back to the breakdown's savings field.
     */
    public function getDynamicPricingTotalAdjustment(): float
    {
        $delta = (float) ($this->pricingCalculation['dp_total_adjustment'] ?? 0);
        if ($delta !== 0.0) {
            return $delta;
        }
        $dp = $this->getDynamicPricing();
        if ($dp && isset($dp['savings'])) {
            return -1.0 * (float) $dp['savings']; // savings positive = discount, so negate for signed delta
        }
        return 0.0;
    }

    public function getDynamicPricingLabel(): string
    {
        $dp = $this->getDynamicPricing();
        return $dp ? (string) ($dp['label'] ?? __('Dynamic Pricing', 'yatra')) : '';
    }

    // ========== Tax Information ==========
    
    public function isTaxEnabled(): bool
    {
        return !empty($this->taxCalculation['enable_tax']);
    }
    
    public function getTaxBreakdown(): array
    {
        return $this->taxCalculation['tax_breakdown'] ?? [];
    }
    
    public function getTotalTaxAmount(): float
    {
        return (float) ($this->taxCalculation['total_tax_amount'] ?? 0);
    }
    
    public function isTaxInclusive(): bool
    {
        return !empty($this->taxCalculation['tax_inclusive']);
    }
    
    public function hasTaxes(): bool
    {
        return $this->isTaxEnabled() && !empty($this->getTaxBreakdown());
    }
    
    public function getTaxableAmount(): float
    {
        return (float) ($this->pricingCalculation['taxable_amount'] ?? 0);
    }
    
    // ========== Payment Methods ==========
    
    public function getPaymentMethod(): string
    {
        return $this->session['payment_method'] ?? 'full';
    }
    
    public function isDepositPayment(): bool
    {
        return $this->getPaymentMethod() === 'deposit';
    }
    
    public function isPartialPayment(): bool
    {
        return $this->getPaymentMethod() === 'partial';
    }
    
    public function getDepositPercentage(): int
    {
        return (int) ($this->session['deposit_percentage'] ?? 20);
    }
    
    public function getPartialPercentage(): int
    {
        return (int) ($this->session['partial_payment_percentage'] ?? 30);
    }
    
    // ========== Additional Services ==========
    
    public function getAdditionalServices(): array
    {
        return $this->pricingCalculation['additional_services'] ?? [];
    }
    
    public function getServicesTotal(): float
    {
        return (float) ($this->pricingCalculation['services_total'] ?? 0);
    }
    
    public function hasAdditionalServices(): bool
    {
        return !empty($this->getAdditionalServices());
    }
    
    // ========== Itinerary Costs ==========
    
    public function getItineraryCosts(): array
    {
        return $this->pricingCalculation['itinerary_costs'] ?? [];
    }
    
    public function getItineraryCostsTotal(): float
    {
        return (float) ($this->pricingCalculation['itinerary_costs_total'] ?? 0);
    }
    
    public function hasItineraryCosts(): bool
    {
        return !empty($this->getItineraryCosts());
    }
    
    // ========== Currency ==========
    
    public function getCurrency(): ?string
    {
        return $this->pricingCalculation['currency'] ?? null;
    }
    
    public function getCurrencySymbol(): string
    {
        return yatra_get_currency_symbol($this->getCurrency());
    }
    
    // ========== Formatted Prices ==========
    
    public function formatPrice(float $amount): string
    {
        return yatra_format_price($amount, $this->getCurrency());
    }
    
    public function getFormattedPricePerPerson(): string
    {
        return $this->formatPrice($this->getPricePerPerson());
    }
    
    public function getFormattedGrossTotal(): string
    {
        return $this->formatPrice($this->getGrossTotal());
    }
    
    public function getFormattedNetTotal(): string
    {
        return $this->formatPrice($this->getNetTotal());
    }
    
    public function getFormattedAmountDue(): string
    {
        return $this->formatPrice($this->getAmountDue());
    }
    
    public function getFormattedCouponDiscount(): string
    {
        return $this->formatPrice($this->getCouponDiscountAmount());
    }
    
    public function getFormattedGroupDiscount(): string
    {
        return $this->formatPrice($this->getGroupDiscountAmount());
    }
    
    // ========== Raw Data Access (for advanced use) ==========
    
    public function getSession(): array
    {
        return $this->session;
    }
    
    public function getPricingCalculation(): array
    {
        return $this->pricingCalculation;
    }
    
    public function getTaxCalculation(): array
    {
        return $this->taxCalculation;
    }
}