mint/api-v13/app/Http/Controllers/ArticleNavController.php

<?php

namespace App\Http\Controllers;

use App\Http\Resources\ArticleNavResource;
use App\Models\PaliText;
use Illuminate\Http\Request;
use Illuminate\Http\Response;

class ArticleNavController extends Controller
{
    /**
     * Display a listing of the resource.
     *
     * @return Response
     */
    public function index(Request $request)
    {
        //
        switch ($request->input('type')) {
            case 'chapter':
                $para = explode('-', $request->input('id'));
                $prev = PaliText::where('book', $para[0])
                    ->where('paragraph', '<', $para[1])
                    ->where('level', '<', 8)
                    ->orderBy('paragraph', 'desc')
                    ->first();
                $next = PaliText::where('book', $para[0])
                    ->where('paragraph', '>', $para[1])
                    ->where('level', '<', 8)
                    ->orderBy('paragraph', 'asc')
                    ->first();
                if ($prev) {
                    $nav['prev']['id'] = $prev->book.'-'.$prev->paragraph;
                    $nav['prev']['title'] = $prev->toc;
                    $nav['prev']['subtitle'] = $prev->toc;
                }
                if ($next) {
                    $nav['next']['id'] = $next->book.'-'.$next->paragraph;
                    $nav['next']['title'] = $next->toc;
                    $nav['next']['subtitle'] = $next->toc;
                }
                break;
            case 'para':
                $para = explode('-', $request->input('id'));
                $prev = PaliText::where('book', $para[0])
                    ->where('paragraph', '<', $para[1])
                    ->orderBy('paragraph', 'desc')
                    ->first();
                $next = PaliText::where('book', $para[0])
                    ->where('paragraph', '>', $para[1])
                    ->orderBy('paragraph', 'asc')
                    ->first();
                if ($prev) {
                    $nav['prev']['id'] = $prev->book.'-'.$prev->paragraph;
                    $nav['prev']['title'] = $prev->text;
                    $nav['prev']['subtitle'] = $prev->text;
                }
                if ($next) {
                    $nav['next']['id'] = $next->book.'-'.$next->paragraph;
                    $nav['next']['title'] = $next->text;
                    $nav['next']['subtitle'] = $next->text;
                }
                break;
            default:
                return $this->error('type?');
                break;
        }
        if (isset($nav)) {
            return $this->ok(new ArticleNavResource($nav));
        } else {
            return $this->error('no nav data', 200, 200);
        }
    }

    /**
     * Store a newly created resource in storage.
     *
     * @return Response
     */
    public function store(Request $request)
    {
        //
    }

    /**
     * Display the specified resource.
     *
     * @param  int  $id
     * @return Response
     */
    public function show($id)
    {
        //
    }

    /**
     * Update the specified resource in storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function update(Request $request, $id)
    {
        //
    }

    /**
     * Remove the specified resource from storage.
     *
     * @param  int  $id
     * @return Response
     */
    public function destroy($id)
    {
        //
    }
}