<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use App\Models\Post;
use Illuminate\Http\RedirectResponse;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use Illuminate\Support\Str;
use Illuminate\View\View;

class PostController extends Controller
{
    public function index(Request $request): View
    {
        $q = trim((string) $request->query('q', ''));
        $posts = Post::query()
            ->when($q !== '', function ($qb) use ($q) {
                $qb->where('title', 'like', "%{$q}%")
                   ->orWhere('slug', 'like', "%{$q}%");
            })
            ->latest('created_at')
            ->paginate(20)
            ->withQueryString();

        return view('admin.posts.index', compact('posts', 'q'));
    }

    public function create(): View
    {
        return view('admin.posts.create');
    }

    public function store(Request $request): RedirectResponse
    {
        $data = $this->validateData($request);

        $slug = trim((string) ($data['slug'] ?? ''));
        if ($slug === '') {
            $slug = $this->uniqueSlug($data['title']);
        }

        $coverImageValue = $data['cover_image'] ?? null;
        if ($request->hasFile('cover_image_file')) {
            $coverImageValue = $request->file('cover_image_file')->store('posts/covers', 'public');
        }

        Post::create([
            'title' => $data['title'],
            'slug' => $slug,
            'excerpt' => $data['excerpt'] ?? null,
            'body' => $data['body'],
            'cover_image' => $coverImageValue,
            'author_id' => Auth::id(),
            'published_at' => $request->boolean('published') ? now() : null,
        ]);

        return redirect()->route('admin.posts.index')->with('status', 'Post created');
    }

    public function edit(Post $post): View
    {
        return view('admin.posts.edit', compact('post'));
    }

    public function update(Request $request, Post $post): RedirectResponse
    {
        $data = $this->validateData($request, $post->id);

        $slug = trim((string) ($data['slug'] ?? ''));
        if ($slug === '') {
            $slug = $this->uniqueSlug($data['title'], $post->id);
        }

        $coverImageValue = $data['cover_image'] ?? $post->cover_image;
        if ($request->hasFile('cover_image_file')) {
            $coverImageValue = $request->file('cover_image_file')->store('posts/covers', 'public');
        }

        $post->update([
            'title' => $data['title'],
            'slug' => $slug,
            'excerpt' => $data['excerpt'] ?? null,
            'body' => $data['body'],
            'cover_image' => $coverImageValue,
            'published_at' => $request->boolean('published') ? ($post->published_at ?? now()) : null,
        ]);

        return redirect()->route('admin.posts.index')->with('status', 'Post updated');
    }

    public function destroy(Post $post): RedirectResponse
    {
        $post->delete();

        return redirect()->route('admin.posts.index')->with('status', 'Post deleted');
    }

    protected function validateData(Request $request, ?int $ignoreId = null): array
    {
        return $request->validate([
            'title' => ['required', 'string', 'max:255'],
            'slug' => ['nullable', 'string', 'max:255', 'unique:posts,slug' . ($ignoreId ? ',' . $ignoreId : '')],
            'excerpt' => ['nullable', 'string', 'max:500'],
            'body' => ['required', 'string'],
            'cover_image' => ['nullable', 'string', 'max:2048'],
            'cover_image_file' => ['nullable', 'image', 'mimes:jpeg,jpg,png,webp,avif,gif', 'max:8192'],
            'published' => ['nullable', 'boolean'],
        ]);
    }

    protected function uniqueSlug(string $title, ?int $ignoreId = null): string
    {
        $base = Str::slug($title);
        if ($base === '') { $base = 'post'; }
        $slug = $base;
        $i = 1;
        while (Post::where('slug', $slug)
            ->when($ignoreId, fn($q) => $q->where('id', '!=', $ignoreId))
            ->exists()) {
            $slug = $base . '-' . (++$i);
        }
        return $slug;
    }
}