<?php

namespace App\Controllers;

use App\Core\Request;
use App\Core\Response;
use App\Services\CurriculumService;
use App\Services\CurriculumExtractorService;

class CurriculumController
{
    /**
     * Upload and Deep-Extract Real Ministry PDF Document
     */
    public function uploadPdf(Request $request, Response $response): void
    {
        if (empty($_FILES['pdf_file']) || $_FILES['pdf_file']['error'] !== UPLOAD_ERR_OK) {
            $response->status(400)->json([
                'status'  => 'error',
                'message' => 'يرجى اختيار ملف PDF صالح للمنهاج الوزاري.'
            ]);
            return;
        }

        $file = $_FILES['pdf_file'];
        $origName = $file['name'];
        $tmpPath = $file['tmp_name'];

        // Save original uploaded PDF in storage/uploads/curriculum
        $uploadsDir = __DIR__ . '/../../storage/uploads/curriculum';
        if (!is_dir($uploadsDir)) {
            mkdir($uploadsDir, 0777, true);
        }
        $savedPdfPath = $uploadsDir . '/' . time() . '_' . preg_replace('/[^A-Za-z0-9_\-\.]/u', '_', $origName);
        move_uploaded_file($tmpPath, $savedPdfPath);

        // Perform Deep Multi-Engine Extraction & Structuring
        $parsedStructure = CurriculumExtractorService::extractAndStructure($origName, $savedPdfPath);

        // Merge into live tree and save to disk
        $updatedTree = CurriculumService::mergeExtractedCurriculum($parsedStructure);

        $firstLessonFile = '';
        $firstLessonMd = '';
        $firstLessonTitle = '';
        $firstLessonOutcomes = [];
        $breadcrumb = '';

        if (!empty($parsedStructure['units'][0]['lessons'][0])) {
            $firstLes = $parsedStructure['units'][0]['lessons'][0];
            $firstLessonFile = "{$parsedStructure['grade_key']}/{$parsedStructure['subject_key']}/{$parsedStructure['semester_key']}/{$parsedStructure['units'][0]['unit_key']}/{$firstLes['lesson_id']}.md";
            $firstLessonMd = CurriculumService::getLessonMarkdown($firstLessonFile);
            $firstLessonTitle = $firstLes['title'];
            $firstLessonOutcomes = $firstLes['outcomes'] ?? [];
            $breadcrumb = "{$parsedStructure['grade_name']} ⟵ {$parsedStructure['subject_name']} ⟵ {$parsedStructure['units'][0]['unit_name']}";
        }

        $serverStorageDir = realpath(__DIR__ . '/../../storage/curriculum');

        $response->json([
            'status'             => 'success',
            'message'            => "تم تفريغ وفهرسة المنهاج [{$origName}] بنجاح في قاعدة المعرفة!",
            'extracted_data'     => $parsedStructure,
            'tree'               => $updatedTree,
            'active_file'        => $firstLessonFile,
            'active_md'          => $firstLessonMd,
            'active_title'       => $firstLessonTitle,
            'active_outcomes'    => $firstLessonOutcomes,
            'active_breadcrumb'  => $breadcrumb,
            'server_storage_dir' => $serverStorageDir
        ]);
    }

    /**
     * Get Complete Live Tree
     */
    public function getTree(Request $request, Response $response): void
    {
        $response->json([
            'status' => 'success',
            'data'   => CurriculumService::getCurriculumTree()
        ]);
    }

    /**
     * Get Single Lesson Markdown Content
     */
    public function getLessonContent(Request $request, Response $response): void
    {
        $file = $request->getQueryParams()['file'] ?? '';
        if (empty($file)) {
            $response->status(400)->json(['status' => 'error', 'message' => 'مسار الملف مطلوب']);
            return;
        }
        $content = CurriculumService::getLessonMarkdown($file);
        $serverFullPath = realpath(__DIR__ . '/../../storage/curriculum') . '/' . ltrim($file, '/');

        $response->json([
            'status'           => 'success',
            'file'             => $file,
            'server_full_path' => $serverFullPath,
            'content'          => $content
        ]);
    }

    /**
     * Save Lesson Markdown Content
     */
    public function saveLessonContent(Request $request, Response $response): void
    {
        $body = $request->getBody();
        $file = $body['file'] ?? '';
        $content = $body['content'] ?? '';

        if (empty($file) || empty($content)) {
            $response->status(400)->json(['status' => 'error', 'message' => 'بيانات الحفظ غير مكتملة']);
            return;
        }

        CurriculumService::saveLessonMarkdown($file, $content);
        $serverFullPath = realpath(__DIR__ . '/../../storage/curriculum') . '/' . ltrim($file, '/');

        $response->json([
            'status'           => 'success',
            'message'          => 'تم حفظ واعتماد محتوى الدرس في المنهاج بنجاح!',
            'server_full_path' => $serverFullPath
        ]);
    }
}