<?php

namespace App\Http\Controllers\Link;

use App\Http\Controllers\Controller;
use App\Models\ShortLink;
use App\Services\Link\LinkBillingService;
use App\Services\Link\LinkManagerService;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\View\View;
use RuntimeException;

class LinkController extends Controller
{
    public function __construct(
        private LinkManagerService $links,
        private LinkBillingService $billing,
    ) {}

    public function index(Request $request): View
    {
        $account = ladill_account();
        $links = ShortLink::query()
            ->where('user_id', $account->id)
            ->latest()
            ->paginate(20);

        return view('links.index', [
            'links' => $links,
            'canCreate' => $this->billing->canCreate($account),
            'pricePerLink' => \App\Models\LinkWallet::pricePerLink(),
        ]);
    }

    public function create(): View
    {
        $account = ladill_account();

        return view('links.create', [
            'canCreate' => $this->billing->canCreate($account),
            'pricePerLink' => \App\Models\LinkWallet::pricePerLink(),
        ]);
    }

    public function store(Request $request): RedirectResponse
    {
        $validated = $request->validate([
            'destination_url' => ['required', 'string', 'max:2048'],
            'label' => ['nullable', 'string', 'max:120'],
            'custom_slug' => ['nullable', 'string', 'max:20', 'regex:/^[a-z0-9][a-z0-9-]{1,18}[a-z0-9]$/'],
            'expires_at' => ['nullable', 'date', 'after:now'],
        ]);

        try {
            $link = $this->links->create(ladill_account(), $validated);
        } catch (RuntimeException $e) {
            return back()->withInput()->withErrors(['balance' => $e->getMessage()]);
        }

        return redirect()
            ->route('user.links.show', $link)
            ->with('success', 'Short link created.');
    }

    public function show(ShortLink $link): View
    {
        $this->authorizeLink($link);

        return view('links.show', [
            'link' => $link,
            'recentClicks' => $link->clicks()->latest('clicked_at')->limit(20)->get(),
        ]);
    }

    public function update(Request $request, ShortLink $link): RedirectResponse
    {
        $this->authorizeLink($link);

        $validated = $request->validate([
            'destination_url' => ['sometimes', 'required', 'string', 'max:2048'],
            'label' => ['nullable', 'string', 'max:120'],
            'is_active' => ['sometimes', 'boolean'],
            'expires_at' => ['nullable', 'date'],
        ]);

        try {
            $this->links->update($link, $validated);
        } catch (RuntimeException $e) {
            return back()->withInput()->withErrors(['destination_url' => $e->getMessage()]);
        }

        return back()->with('success', 'Link updated.');
    }

    public function destroy(ShortLink $link): RedirectResponse
    {
        $this->authorizeLink($link);
        $link->delete();

        return redirect()->route('user.links.index')->with('success', 'Link deleted.');
    }

    public function checkSlug(Request $request): \Illuminate\Http\JsonResponse
    {
        $slug = strtolower((string) $request->query('slug', ''));
        $taken = $slug !== '' && ShortLink::where('slug', $slug)->exists();

        return response()->json(['available' => ! $taken]);
    }

    private function authorizeLink(ShortLink $link): void
    {
        if ($link->user_id !== ladill_account()->id) {
            abort(403);
        }
    }
}