<?php

namespace App\Controllers;

use App\Core\Database;
use App\Core\Request;
use App\Core\Response;

class ErrorNotebookController
{
    public function getErrorNotebook(Request $request, Response $response): void
    {
        $studentId = (int)$request->user_id;
        $sql = "SELECT * FROM student_error_notebook WHERE student_id = ?";
        $params = [$studentId];
        $subject = trim((string)$request->getQuery('subject', ''));
        $status = trim((string)$request->getQuery('status', ''));
        if ($subject !== '') { $sql .= ' AND subject_id = ?'; $params[] = $subject; }
        if ($status !== '') { $sql .= ' AND status = ?'; $params[] = $status; }
        $items = Database::select($sql . ' ORDER BY created_at DESC', $params);

        $mastered = count(array_filter($items, fn($item) => ($item['status'] ?? '') === 'mastered'));
        $bySubject = [];
        foreach ($items as $item) {
            $name = (string)($item['subject_name'] ?? '');
            if ($name !== '') $bySubject[$name] = ($bySubject[$name] ?? 0) + 1;
        }
        $total = count($items);
        $response->json(['status' => 'success', 'data' => [
            'summary' => [
                'total_errors' => $total,
                'mastered_count' => $mastered,
                'pending_count' => $total - $mastered,
                'mastery_percentage' => $total ? round(($mastered / $total) * 100, 1) : 0.0,
                'by_subject' => $bySubject,
            ],
            'items' => $items,
        ]]);
    }

    public function logError(Request $request, Response $response): void
    {
        $body = $request->getBody();
        foreach (['subject_id', 'subject_name', 'topic_name', 'source_type', 'question_text', 'student_wrong_answer', 'correct_answer'] as $field) {
            if (trim((string)($body[$field] ?? '')) === '') {
                $response->status(422)->json(['status' => 'error', 'message' => "الحقل {$field} مطلوب"]);
                return;
            }
        }
        $uuid = $this->uuid();
        Database::insert(
            "INSERT INTO student_error_notebook
             (uuid, student_id, subject_id, subject_name, topic_name, lesson_id, source_type, question_text, options_json,
              student_wrong_answer, correct_answer, socratic_hint, error_category, status, created_at)
             VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, 'pending_remediation', NOW())",
            [
                $uuid, (int)$request->user_id, $body['subject_id'], $body['subject_name'], $body['topic_name'],
                !empty($body['lesson_id']) ? (int)$body['lesson_id'] : null, $body['source_type'], $body['question_text'],
                isset($body['options']) ? json_encode($body['options'], JSON_UNESCAPED_UNICODE) : null,
                $body['student_wrong_answer'], $body['correct_answer'], (string)($body['socratic_hint'] ?? ''),
                (string)($body['error_category'] ?? 'conceptual'),
            ]
        );
        $response->status(201)->json(['status' => 'success', 'uuid' => $uuid]);
    }

    public function getRemediationQuiz(Request $request, Response $response): void
    {
        $uuid = trim((string)$request->getQuery('error_uuid', ''));
        $error = Database::selectOne(
            "SELECT id FROM student_error_notebook WHERE uuid = ? AND student_id = ? LIMIT 1",
            [$uuid, (int)$request->user_id]
        );
        if (!$error) {
            $response->status(404)->json(['status' => 'error', 'message' => 'الفجوة التعليمية غير موجودة']);
            return;
        }
        $response->status(409)->json(['status' => 'error', 'message' => 'لم يُولّد الخادم اختباراً علاجياً موثقاً لهذه الفجوة بعد']);
    }

    public function resolveError(Request $request, Response $response): void
    {
        $response->status(409)->json([
            'status' => 'error',
            'message' => 'يتم اعتماد الإتقان حصراً بعد تسليم اختبار علاجي وتصحيحه على الخادم',
        ]);
    }

    private function uuid(): string
    {
        $data = random_bytes(16);
        $data[6] = chr((ord($data[6]) & 0x0f) | 0x40);
        $data[8] = chr((ord($data[8]) & 0x3f) | 0x80);
        return vsprintf('%s%s-%s-%s-%s-%s%s%s', str_split(bin2hex($data), 4));
    }
}