// ═══════════════════════════════════════════════════════════════
// driver_fingerprint_migration.dart
// ───────────────────────────────────────────────────────────────
// المنطق ببساطة:
//   1. خذ البصمة كما هي من DB
//   2. split('_') → احذف آخر جزء (OS version)
//   3. join('_') → encrypt → رفع
//
// مثال:
//   "abc123_SamsungA51_13"    → "abc123_SamsungA51"   → encrypt
//   "TECNO_LH7n-GL_14"       → "TECNO_LH7n-GL"       → encrypt
//   "unknown_2412DPC0AG_15"  → "unknown_2412DPC0AG"  → encrypt
// ═══════════════════════════════════════════════════════════════

import 'package:flutter/material.dart';

import '../../../constant/links.dart';
import '../../../controller/functions/crud.dart';
import '../../../controller/functions/encrypt_decrypt.dart';
import '../../../print.dart';

class DriverFingerprintMigrationTool extends StatefulWidget {
  const DriverFingerprintMigrationTool({super.key});

  @override
  State<DriverFingerprintMigrationTool> createState() =>
      _DriverFingerprintMigrationToolState();
}

class _DriverFingerprintMigrationToolState
    extends State<DriverFingerprintMigrationTool> {
  bool _isRunning = false;
  bool _isDone = false;
  int _total = 0;
  int _processed = 0;
  int _updated = 0;
  int _failed = 0;
  String _currentLog = '';

  static const int _batchSize = 50;

  // ─────────────────────────────────────────────────────────────
  // المنطق الأساسي — حذف آخر جزء بعد "_"
  // ─────────────────────────────────────────────────────────────
  String _removeLastSegment(String raw) {
    final parts = raw.split('_');
    if (parts.length <= 1) return raw; // جزء واحد — ما في شيء نحذفه
    parts.removeLast();
    return parts.join('_');
  }

  Future<void> _startMigration() async {
    setState(() {
      _isRunning = true;
      _isDone = false;
      _processed = 0;
      _updated = 0;
      _failed = 0;
      _currentLog = 'جارٍ جلب بصمات السائقين...';
    });

    try {
      final records = await _fetchAll();
      if (records == null) {
        _log('❌ فشل في جلب البيانات');
        setState(() => _isRunning = false);
        return;
      }

      _total = records.length;
      _log('✅ تم جلب $_total بصمة — بدء المعالجة...');

      for (int i = 0; i < records.length; i += _batchSize) {
        final batch = records.skip(i).take(_batchSize).toList();
        _log('⚙️ معالجة ${i + 1} → ${i + batch.length} من $_total');
        await Future.wait(batch.map(_processSingle));
        if (i + _batchSize < records.length) {
          await Future.delayed(const Duration(milliseconds: 300));
        }
      }

      _log('🎉 اكتمل!\nمحدَّث: $_updated | فاشل: $_failed');
      setState(() {
        _isDone = true;
        _isRunning = false;
      });
    } catch (e) {
      _log('❌ خطأ: $e');
      setState(() => _isRunning = false);
    }
  }

  Future<List<Map<String, dynamic>>?> _fetchAll() async {
    try {
      final response = await CRUD().post(
        link: AppLink.getAllDriverFingerprints,
        payload: {'admin_key': 'iuyweiruinakjbfkajkjlkmalkcxnlahd'},
      );
      if (response == 'failure' || response == null) return null;

      final data = response['data'];
      if (data is! List) return null;

      return List<Map<String, dynamic>>.from(data);
    } catch (e) {
      Log.print('fetchAll error: $e');
      return null;
    }
  }

  Future<void> _processSingle(Map<String, dynamic> record) async {
    final captainId = record['captain_id']?.toString() ?? '';
    final rawFp = record['fingerPrint']?.toString() ?? '';

    if (captainId.isEmpty || rawFp.isEmpty) {
      setState(() {
        _failed++;
        _processed++;
      });
      return;
    }

    try {
      // ── حذف آخر جزء (OS version) ─────────────────────────────
      final String newRaw = _removeLastSegment(rawFp);
      final String encrypted = EncryptionHelper.instance.encryptData(newRaw);

      Log.print('🔄 [$captainId] "$rawFp" → "$newRaw" → encrypted');

      // ── رفع للسيرفر ──────────────────────────────────────────
      final res = await CRUD().post(
        link: AppLink.updateDriverFingerprintAdmin,
        payload: {
          'captain_id': captainId,
          'fingerprint': encrypted,
          'admin_key': 'iuyweiruinakjbfkajkjlkmalkcxnlahd',
        },
      );

      if (res != 'failure' && res?['status'] == 'success') {
        setState(() {
          _updated++;
          _processed++;
        });
      } else {
        setState(() {
          _failed++;
          _processed++;
        });
      }
    } catch (e) {
      Log.print('❌ [$captainId]: $e');
      setState(() {
        _failed++;
        _processed++;
      });
    }
  }

  void _log(String msg) {
    Log.print(msg);
    setState(() => _currentLog = msg);
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Driver FP Migration')),
      body: Padding(
        padding: const EdgeInsets.all(24),
        child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
          Container(
            padding: const EdgeInsets.all(16),
            decoration: BoxDecoration(
              color: Colors.orange.shade50,
              borderRadius: BorderRadius.circular(12),
              border: Border.all(color: Colors.orange.shade200),
            ),
            child: const Text(
              '⚠️ تُستخدم مرة واحدة فقط\n\n'
              '"abc123_Samsung_13" → "abc123_Samsung" → encrypt\n'
              '"TECNO_LH7n_14"     → "TECNO_LH7n"     → encrypt',
              style:
                  TextStyle(fontSize: 13, height: 1.7, fontFamily: 'monospace'),
            ),
          ),
          const SizedBox(height: 24),
          if (_total > 0) ...[
            Text('التقدم: $_processed / $_total',
                style: const TextStyle(fontWeight: FontWeight.bold)),
            const SizedBox(height: 8),
            LinearProgressIndicator(
              value: _total > 0 ? _processed / _total : 0,
              backgroundColor: Colors.grey.shade200,
              color: _isDone ? Colors.green : Colors.blue,
              minHeight: 8,
            ),
            const SizedBox(height: 16),
          ],
          if (_processed > 0)
            Row(children: [
              _chip('محدَّث', _updated, Colors.green),
              const SizedBox(width: 8),
              _chip('فاشل', _failed, Colors.red),
            ]),
          const SizedBox(height: 16),
          if (_currentLog.isNotEmpty)
            Container(
              width: double.infinity,
              padding: const EdgeInsets.all(12),
              decoration: BoxDecoration(
                color: Colors.grey.shade100,
                borderRadius: BorderRadius.circular(8),
              ),
              child: Text(_currentLog,
                  style:
                      const TextStyle(fontFamily: 'monospace', fontSize: 12)),
            ),
          const Spacer(),
          SizedBox(
            width: double.infinity,
            height: 52,
            child: ElevatedButton(
              onPressed: (_isRunning || _isDone) ? null : _startMigration,
              style: ElevatedButton.styleFrom(
                backgroundColor: _isDone ? Colors.green : Colors.blue,
                shape: RoundedRectangleBorder(
                    borderRadius: BorderRadius.circular(12)),
              ),
              child: _isRunning
                  ? const Row(
                      mainAxisAlignment: MainAxisAlignment.center,
                      children: [
                        SizedBox(
                            width: 20,
                            height: 20,
                            child: CircularProgressIndicator(
                                color: Colors.white, strokeWidth: 2)),
                        SizedBox(width: 12),
                        Text('جارٍ الترحيل...',
                            style:
                                TextStyle(color: Colors.white, fontSize: 16)),
                      ],
                    )
                  : Text(
                      _isDone ? '✅ اكتمل الترحيل' : 'بدء ترحيل بصمات السائقين',
                      style: const TextStyle(color: Colors.white, fontSize: 16),
                    ),
            ),
          ),
        ]),
      ),
    );
  }

  Widget _chip(String label, int value, Color color) => Container(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 6),
        decoration: BoxDecoration(
          color: color.withOpacity(0.1),
          borderRadius: BorderRadius.circular(20),
          border: Border.all(color: color.withOpacity(0.3)),
        ),
        child: Text('$label: $value',
            style: TextStyle(color: color, fontWeight: FontWeight.bold)),
      );
}