<?php

namespace App\Domains\Forms\Services;

use App\Domains\Catalog\Models\CatalogItem;
use App\Domains\Catalog\Models\Variant;
use App\Domains\Tenant\Models\Tenant;
use App\Domains\Ticket\Models\Ticket;
use Illuminate\Database\Eloquent\Collection;

class TicketFormService
{
    private const PRODUCT = 'product';

    /**
     * @var array<string, array{label: string|null, product: string, type: string|null, order: int}>
     */
    private const CATEGORY_PRESENTATIONS = [
        'entradas' => [
            'label' => null,
            'product' => self::PRODUCT,
            'type' => null,
            'order' => 1,
        ],
        'alojamientos' => [
            'label' => 'Camping',
            'product' => 'tipo_alojamiento',
            'type' => null,
            'order' => 2,
        ],
        'camping' => [
            'label' => null,
            'product' => 'tipo_alojamiento',
            'type' => null,
            'order' => 2,
        ],
        'comidas' => [
            'label' => 'Comida',
            'product' => 'event_date',
            'type' => 'horario',
            'order' => 3,
        ],
        'comida' => [
            'label' => null,
            'product' => 'event_date',
            'type' => 'horario',
            'order' => 3,
        ],
        'merchandising' => [
            'label' => null,
            'product' => self::PRODUCT,
            'type' => 'color',
            'order' => 4,
        ],
    ];

    /**
     * @return array{
     *     statuses: list<array{value: string, label: string}>,
     *     categories: list<array{
     *         value: string,
     *         label: string,
     *         products: list<array{
     *             value: string,
     *             label: string,
     *             types: list<array{value: string, label: string}>
     *         }>
     *     }>
     * }
     */
    public function get(Tenant $tenant): array
    {
        $items = CatalogItem::query()
            ->where('tenant_code', $tenant->codigo)
            ->where('has_tickets', true)
            ->whereHas('category')
            ->with($this->relations())
            ->orderBy('group_order')
            ->orderBy('nombre')
            ->get();

        return $this->build($items);
    }

    /**
     * Return active catalog options plus soft-deleted sources still referenced by
     * tickets, so historical tickets never become impossible to filter.
     *
     * @return array{
     *     statuses: list<array{value: string, label: string}>,
     *     categories: list<array{
     *         value: string,
     *         label: string,
     *         products: list<array{
     *             value: string,
     *             label: string,
     *             types: list<array{value: string, label: string}>
     *         }>
     *     }>
     * }
     */
    public function getForFilters(Tenant $tenant): array
    {
        $historicalVariantIds = Ticket::query()
            ->where('tenant_code', $tenant->codigo)
            ->whereNotNull('source_variant_id')
            ->distinct()
            ->pluck('source_variant_id')
            ->map(fn ($id): int => (int) $id)
            ->all();
        $historicalCatalogItemIds = Ticket::query()
            ->where('tenant_code', $tenant->codigo)
            ->whereNotNull('source_catalog_item_id')
            ->distinct()
            ->pluck('source_catalog_item_id')
            ->map(fn ($id): int => (int) $id)
            ->merge(
                Variant::withTrashed()
                    ->whereKey($historicalVariantIds)
                    ->pluck('catalog_item_id')
                    ->map(fn ($id): int => (int) $id),
            )
            ->unique()
            ->values()
            ->all();

        $items = CatalogItem::withTrashed()
            ->where('tenant_code', $tenant->codigo)
            ->whereHas('category')
            ->where(function ($query) use ($historicalCatalogItemIds): void {
                $query
                    ->where(function ($activeQuery): void {
                        $activeQuery
                            ->whereNull('catalog_items.deleted_at')
                            ->where('has_tickets', true);
                    })
                    ->orWhereIn('catalog_items.id', $historicalCatalogItemIds);
            })
            ->with([
                'category',
                'itemAttributes.attribute.options',
                'variants' => fn ($query) => $query
                    ->withTrashed()
                    ->where(function ($variantQuery) use ($historicalVariantIds): void {
                        $variantQuery
                            ->whereNull('variantes.deleted_at')
                            ->orWhereIn('variantes.id', $historicalVariantIds);
                    }),
                'variants.definitions.itemAttribute.attribute.options',
                'variants.eventDates',
                'variants.eventDate',
            ])
            ->orderBy('group_order')
            ->orderBy('nombre')
            ->get();

        return $this->build($items);
    }

    /**
     * @param  Collection<int, CatalogItem>  $items
     * @return array{
     *     statuses: list<array{value: string, label: string}>,
     *     categories: list<array{
     *         value: string,
     *         label: string,
     *         products: list<array{
     *             value: string,
     *             label: string,
     *             types: list<array{value: string, label: string}>
     *         }>
     *     }>
     * }
     */
    private function build(Collection $items): array
    {
        $categories = [];

        foreach ($items as $item) {
            $sourceCategory = trim((string) $item->category?->nombre);
            $categoryValue = mb_strtolower($sourceCategory);
            $presentation = self::CATEGORY_PRESENTATIONS[$categoryValue] ?? [
                'label' => null,
                'product' => self::PRODUCT,
                'type' => null,
                'order' => PHP_INT_MAX,
            ];

            $categories[$categoryValue] ??= [
                'value' => $categoryValue,
                'label' => $presentation['label'] ?? $sourceCategory,
                'order' => $presentation['order'],
                'products' => [],
            ];

            foreach ($this->products($item, $presentation['product'], $presentation['type']) as $product) {
                $productValue = $product['value'];
                $existingProduct = $categories[$categoryValue]['products'][$productValue] ?? [
                    'value' => $productValue,
                    'label' => $product['label'],
                    'types' => [],
                ];

                foreach ($product['types'] as $type) {
                    $existingProduct['types'][$type['value']] = $type;
                }

                $categories[$categoryValue]['products'][$productValue] = $existingProduct;
            }
        }

        uasort($categories, fn (array $left, array $right): int => $left['order'] <=> $right['order']
            ?: $left['label'] <=> $right['label']);

        return [
            'statuses' => [
                ['value' => Ticket::STATUS_ACTIVE, 'label' => 'Activo'],
                ['value' => Ticket::STATUS_USED, 'label' => 'Usado'],
                ['value' => Ticket::STATUS_EXPIRED, 'label' => 'Vencido'],
            ],
            'categories' => array_values(array_map(
                fn (array $category): array => [
                    'value' => $category['value'],
                    'label' => $category['label'],
                    'products' => array_values(array_map(
                        fn (array $product): array => [
                            'value' => $product['value'],
                            'label' => $product['label'],
                            'types' => array_values($product['types']),
                        ],
                        $category['products'],
                    )),
                ],
                $categories,
            )),
        ];
    }

    /** @return list<string> */
    private function relations(): array
    {
        return [
            'category',
            'itemAttributes.attribute.options',
            'variants.definitions.itemAttribute.attribute.options',
            'variants.eventDates',
            'variants.eventDate',
        ];
    }

    /**
     * @return list<array{
     *     value: string,
     *     label: string,
     *     types: list<array{value: string, label: string}>
     * }>
     */
    private function products(CatalogItem $item, string $productCode, ?string $typeCode): array
    {
        if ($productCode === self::PRODUCT) {
            return [[
                'value' => $item->slug,
                'label' => $item->nombre,
                'types' => $this->types($item, $typeCode),
            ]];
        }

        $products = [];

        foreach ($item->variants as $variant) {
            foreach ($this->variantOptions($variant, $productCode) as $productOption) {
                $productValue = $productOption['value'];
                $products[$productValue] ??= [
                    'value' => $productValue,
                    'label' => $this->optionLabel($productOption['label'], $productCode),
                    'types' => [],
                ];

                foreach ($this->variantOptions($variant, $typeCode) as $typeOption) {
                    $products[$productValue]['types'][$typeOption['value']] = $typeOption;
                }
            }
        }

        return array_values(array_map(
            fn (array $product): array => [
                'value' => $product['value'],
                'label' => $product['label'],
                'types' => array_values($product['types']),
            ],
            $products,
        ));
    }

    /** @return list<array{value: string, label: string}> */
    private function types(CatalogItem $item, ?string $typeCode): array
    {
        $types = [];

        foreach ($item->variants as $variant) {
            foreach ($this->variantOptions($variant, $typeCode) as $typeOption) {
                $types[$typeOption['value']] = $typeOption;
            }
        }

        return array_values($types);
    }

    /** @return list<array{value: string, label: string}> */
    private function variantOptions(Variant $variant, ?string $attributeCode): array
    {
        if ($attributeCode === null) {
            return [];
        }

        $selection = $variant->selectionOptions($variant->catalogItem->itemAttributes)
            ->get($attributeCode);

        if ($selection === null) {
            return [];
        }

        return array_is_list($selection) ? $selection : [$selection];
    }

    private function optionLabel(string $label, string $attributeCode): string
    {
        if ($attributeCode !== 'event_date') {
            return $label;
        }

        [$day, $month] = array_pad(explode('/', $label), 2, null);

        return $day !== null && $month !== null ? "{$day}/{$month}" : $label;
    }
}