<?php

declare(strict_types=1);

namespace App\Support;

use App\Models\Account;

final class StripeSubscriptionConversion
{
    /**
     * plan_name/interval shared by every PostHog capture backed by a Stripe
     * subscription webhook payload — trial.started, checkout.completed, and
     * trial.converted all start from this shape. Persona is not included
     * here: it is already set as a person property via identify() during
     * onboarding, so it is joinable on every event without repeating it.
     *
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    public static function baseProperties(Account $account, array $payload): array
    {
        $priceId = data_get($payload, 'data.object.items.data.0.price.id');
        $yearlyPriceId = $account->plan->stripe_yearly_price_id;
        $isYearly = $yearlyPriceId !== null && $priceId === $yearlyPriceId;

        return [
            'plan_name' => $account->plan->name,
            'interval' => $isYearly ? 'yearly' : 'monthly',
        ];
    }

    /**
     * baseProperties() plus conversion_* fields, for the two events backed by
     * an actual charge: TrackCheckoutCompleted and TrackTrialConverted.
     *
     * @param  array<string, mixed>  $payload
     * @return array<string, mixed>
     */
    public static function propertiesFor(Account $account, array $payload): array
    {
        $properties = self::baseProperties($account, $payload);

        $unitAmount = data_get($payload, 'data.object.items.data.0.price.unit_amount');
        $currency = data_get($payload, 'data.object.items.data.0.price.currency');

        if (is_int($unitAmount) && is_string($currency)) {
            $properties['conversion_value'] = (float) ($unitAmount / 100);
            $properties['conversion_currency'] = strtoupper($currency);
            $properties['conversion_transaction_id'] = data_get($payload, 'data.object.id');
        }

        return $properties;
    }
}