<?php

namespace App\Http\Controllers\Qr;

use App\Http\Controllers\Controller;
use App\Models\QrSetting;
use App\Models\Transfer;
use App\Services\Billing\BillingClient;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;

class AccountController extends Controller
{
    public function __construct(private BillingClient $billing) {}

    private function topupUrl(): string
    {
        return 'https://'.config('app.account_domain').'/wallet';
    }

    /** @return array{0: int, 1: array<string, mixed>} */
    private function billingSnapshot(?string $publicId): array
    {
        if (! $publicId) {
            return [0, []];
        }

        $balanceMinor = $this->billing->balanceMinor($publicId);
        $ledger = $this->billing->serviceLedger($publicId, config('billing.service', 'transfer'));

        return [$balanceMinor, $ledger];
    }

    public function wallet(): View
    {
        $user = ladill_account();
        [$balanceMinor, $ledger] = $this->billingSnapshot($user?->public_id);

        return view('qr.account.wallet', [
            'balanceMinor' => $balanceMinor,
            'spentMinor' => (int) ($ledger['spent_minor'] ?? 0),
            'creditedMinor' => (int) ($ledger['credited_minor'] ?? 0),
            'topupUrl' => $this->topupUrl(),
        ]);
    }

    public function billing(): View
    {
        $user = ladill_account();
        [$balanceMinor, $ledger] = $this->billingSnapshot($user?->public_id);

        $activeTransfers = Transfer::query()
            ->where('user_id', $user->id)
            ->where('status', Transfer::STATUS_ACTIVE)
            ->where(function ($query) {
                $query->whereNull('expires_at')->orWhere('expires_at', '>', now());
            })
            ->orderByDesc('storage_bytes')
            ->get();

        $storageBytes = (int) $activeTransfers->sum('storage_bytes');
        $storageGb = round($storageBytes / (1024 * 1024 * 1024), 2);
        $pricePerGb = (float) config('transfer.price_per_gb_month', 1.0);
        $monthlyTotalGhs = round($activeTransfers->sum(fn (Transfer $transfer) => $transfer->monthlyCostGhs()), 2);

        return view('qr.account.billing', [
            'balanceMinor' => $balanceMinor,
            'spentMinor' => (int) ($ledger['spent_minor'] ?? 0),
            'creditedMinor' => (int) ($ledger['credited_minor'] ?? 0),
            'activeTransfers' => $activeTransfers,
            'storageBytes' => $storageBytes,
            'storageGb' => $storageGb,
            'pricePerGb' => $pricePerGb,
            'monthlyTotalGhs' => $monthlyTotalGhs,
            'walletUrl' => route('account.wallet'),
            'topupUrl' => $this->topupUrl(),
        ]);
    }

    public function settings(): View
    {
        $account = ladill_account();
        $settings = $account->getOrCreateQrSetting();

        return view('transfer.settings', [
            'account' => $account,
            'settings' => $settings,
        ]);
    }

    public function updateSettings(Request $request): RedirectResponse
    {
        $account = ladill_account();

        $data = $request->validate([
            'notify_email' => ['nullable', 'email', 'max:255'],
            'product_updates' => ['nullable', 'boolean'],
        ]);

        QrSetting::updateOrCreate(
            ['user_id' => $account->id],
            [
                'notify_email' => $data['notify_email'] ?? null,
                'product_updates' => $request->boolean('product_updates'),
            ],
        );

        return redirect()->route('account.settings')->with('success', 'Settings saved.');
    }
}