<?php

namespace App\Services;

use App\Http\Controllers\Controller;
use App\Models\Product;
use Illuminate\Support\Collection;
use Illuminate\Support\Facades\Schema;
use Rooyesh\Wallet\models\Wallet;

class AssetSummaryService
{
    private const METAL_LABELS = [
        1 => 'طلا',
        2 => 'نقره',
        3 => 'مس',
    ];

    public function buildForCustomer(int $customerId, int $ownerType): array
    {
        $catalog = Product::query()
            ->where('active', 1)
            ->with('file')
            ->get();

        $userWallets = Wallet::query()
            ->with(['product.file'])
            ->where('owner', $customerId)
            ->where('owner_type', $ownerType)
            ->get();

        $mainWallet = $userWallets->first(fn (Wallet $w) => $w->product_id === null);
        $metalIds = $this->catalogMetalIds($catalog);
        $weightUnit = Controller::tradeWeightUnit();
        $hasCountBased = $this->catalogHasCountBased($catalog);
        $hasWeightBased = $this->catalogHasWeightBased($catalog);

        $inventoryCards = $this->buildInventoryCards($userWallets);
        $metalTotals = $this->buildMetalTotals($userWallets, $mainWallet, $metalIds, $weightUnit);
        $cashWallet = (float) ($mainWallet->cash ?? 0);
        $assetsRialValue = $this->sumAssetsRialValue($userWallets);
        $totalRialValue = $cashWallet + $assetsRialValue;

        return [
            'meta' => [
                'metal_ids' => $metalIds,
                'metal_count' => count($metalIds),
                'has_count_based_products' => $hasCountBased,
                'has_weight_based_products' => $hasWeightBased,
                'weight_unit' => $weightUnit,
                'single_metal' => count($metalIds) === 1,
            ],
            'cash_wallet' => round($cashWallet, 0),
            'inventory_cards' => $inventoryCards,
            'count_products' => $hasCountBased
                ? array_values(array_filter($inventoryCards, fn (array $row) => ($row['display_type'] ?? '') === 'count'))
                : [],
            'metal_totals' => $metalTotals,
            'assets_rial_value' => round($assetsRialValue, 0),
            'total_rial_value' => round($totalRialValue, 0),
        ];
    }

    private function catalogMetalIds(Collection $catalog): array
    {
        return $catalog
            ->pluck('metal_id')
            ->filter(fn ($id) => (int) $id > 0)
            ->map(fn ($id) => (int) $id)
            ->unique()
            ->sort()
            ->values()
            ->all();
    }

    private function catalogHasCountBased(Collection $catalog): bool
    {
        return $catalog->contains(fn (Product $product) => $this->isCountBasedProduct($product));
    }

    private function catalogHasWeightBased(Collection $catalog): bool
    {
        return $catalog->contains(fn (Product $product) => !$this->isCountBasedProduct($product));
    }

    private function buildInventoryCards(Collection $userWallets): array
    {
        $cards = [];

        foreach ($userWallets as $walletLine) {
            if ($walletLine->product_id === null || (float) $walletLine->gold <= 0) {
                continue;
            }

            $product = $walletLine->product;
            if (!$product || !$this->shouldShowInAssets($product)) {
                continue;
            }

            $productPayload = $this->productPayload($product);
            $isCountBased = $this->isCountBasedProduct($product);

            $cards[] = [
                'product_id' => (int) $product->id,
                'title' => (string) $product->title,
                'group_type' => (string) ($product->group_type ?? ''),
                'metal_id' => (int) ($product->metal_id ?? 0),
                'quantity' => round((float) $walletLine->gold, 3),
                'unit' => Controller::productQuantityUnit($productPayload),
                'display_type' => $isCountBased ? 'count' : 'weight',
                'unit_weight' => $this->productUnitWeightLabel($product),
                'show_in_assets' => true,
                'file' => $this->filePayload($product),
            ];
        }

        return $cards;
    }

    private function buildMetalTotals(
        Collection $userWallets,
        ?Wallet $mainWallet,
        array $metalIds,
        string $weightUnit
    ): array {
        if ($metalIds === []) {
            return [];
        }

        $mainWalletGrams = Controller::weightToGrams((float) ($mainWallet->gold ?? 0));
        $totals = [];

        foreach ($metalIds as $metalId) {
            $productGrams = 0.0;

            foreach ($userWallets as $walletLine) {
                if ($walletLine->product_id === null || !$walletLine->product) {
                    continue;
                }

                if ((int) $walletLine->product->metal_id !== (int) $metalId) {
                    continue;
                }

                if ((string) ($walletLine->product->group_type ?? '') === 'سکه') {
                    continue;
                }

                $productGrams += Controller::productLineWeightToGrams(
                    $walletLine->product,
                    $walletLine->gold
                );
            }

            $meltedGrams = $this->meltedGramsForMetal($mainWalletGrams, $metalId, $metalIds);
            $productWeight = round(Controller::gramsToTradeUnit($productGrams), 3);
            $meltedWeight = round(Controller::gramsToTradeUnit($meltedGrams), 3);

            $totals[] = [
                'metal_id' => (int) $metalId,
                'metal_label' => self::METAL_LABELS[$metalId] ?? 'فلز',
                'label' => 'کل دارایی ' . (self::METAL_LABELS[$metalId] ?? 'فلز'),
                'product_weight' => $productWeight,
                'melted_weight' => $meltedWeight,
                'total_weight' => round($productWeight + $meltedWeight, 3),
                'unit' => $weightUnit,
            ];
        }

        return $totals;
    }

    private function meltedGramsForMetal(float $mainWalletGrams, int $metalId, array $catalogMetalIds): float
    {
        if ($mainWalletGrams <= 0) {
            return 0.0;
        }

        if (count($catalogMetalIds) === 1) {
            return (int) $catalogMetalIds[0] === (int) $metalId ? $mainWalletGrams : 0.0;
        }

        return (int) $metalId === 1 ? $mainWalletGrams : 0.0;
    }

    private function sumAssetsRialValue(Collection $userWallets): float
    {
        $total = 0.0;

        foreach ($userWallets as $walletLine) {
            if ($walletLine->product_id === null || !$walletLine->product) {
                continue;
            }

            $product = $walletLine->product;
            $qty = (float) $walletLine->gold;
            $metalId = (int) ($product->metal_id ?? 0);

            if ($metalId === 1) {
                $total += (float) ($product->price ?? 0) * $qty;
            } elseif ($metalId === 2 || $metalId === 3) {
                $total += ((float) ($product->price ?? 0) * (float) ($product->amount ?? 1)) * $qty;
            }
        }

        return $total;
    }

    private function shouldShowInAssets(Product $product): bool
    {
        if (Product::hasShowInAssetsColumn()) {
            return (bool) ($product->show_in_assets ?? true);
        }

        return true;
    }

    private function isCountBasedProduct(Product $product): bool
    {
        return Controller::isCountBasedProduct($this->productPayload($product));
    }

    private function productPayload(Product $product): array
    {
        return [
            'unit' => $product->unit ?? null,
            'direct_price' => $product->direct_price ?? null,
            'group_type' => $product->group_type ?? null,
            'amount' => $product->amount ?? null,
        ];
    }

    private function productUnitWeightLabel(Product $product): ?string
    {
        if (!Controller::hasProductUnitWeight($this->productPayload($product))) {
            return null;
        }

        $amount = (float) ($product->amount ?? 0);
        $unit = Controller::productStorageWeightUnit($product);

        return trim($amount . ' ' . $unit);
    }

    private function filePayload(Product $product): ?array
    {
        if (!$product->relationLoaded('file') || !$product->file) {
            return null;
        }

        $file = $product->file->toArray();
        $file['full_src'] = $product->file->src ?? null;

        return $file;
    }
}