<?php

namespace App\Http\Controllers\Admin;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use App\Models\Course;
use App\Models\Chapter;

class ChapterController extends Controller
{
    public function store(Request $request)
    {
        $request->validate([
            'lesson_section_id' => 'required|exists:lesson_sections,id',
            'title' => 'required|max:255',
        ]);
		
		// Find the current max order for this section
		$maxOrder = Chapter::where('lesson_section_id', $request->lesson_section_id)->max('order');

		// If no chapters yet, maxOrder will be null → start at 1
		$nextOrder = $maxOrder ? $maxOrder + 1 : 1;
	
        Chapter::create([
            'lesson_section_id' => $request->lesson_section_id,
            'title' => $request->title,
            'order' => $nextOrder,
        ]);

        return back()->with('success', 'Chapter added.');
    }

    public function destroy(Chapter $chapter)
    {
        $chapter->delete();
        return back()->with('success', 'Chapter removed.');
    }
	
	public function reorder(Request $request)
	{
		$request->validate([
			'order' => 'required|string',
		]);

		$ids = json_decode($request->order, true);

		if (is_array($ids)) {
			foreach ($ids as $index => $id) {
				Chapter::where('id', $id)->update(['order' => $index + 1]);
			}
		}

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

    public function show(Course $course, Chapter $chapter)
    {
        // (Optional) safety check: make sure chapter belongs to this course
        // via its module / section chain, if you want to enforce that later.
        return view('admin.chapters.show', [
            'course'  => $course,
            'chapter' => $chapter,
        ]);
    }


}