import 'package:flutter/material.dart';
import 'package:google_fonts/google_fonts.dart';
import 'package:http/http.dart' as http;
import 'dart:convert';
import 'package:shared_preferences/shared_preferences.dart';
import '../../../core/constants/colors.dart';
import '../../../core/constants/api_constants.dart';

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

  @override
  State<AutomationScreen> createState() => _AutomationScreenState();
}

class _AutomationScreenState extends State<AutomationScreen> {
  int _limit = 20;
  bool _isLoading = false;
  String _lastRun = "";
  
  Future<void> _triggerAutoReply() async {
    setState(() => _isLoading = true);
    try {
      final prefs = await SharedPreferences.getInstance();
      final email = prefs.getString('user_email');
      
      final response = await http.post(
        Uri.parse('${ApiConstants.liveBaseUrl}/social/automation/auto-reply?userId=$email'),
        headers: {'Content-Type': 'application/json'},
        body: jsonEncode({'limit': _limit}),
      );

      if (response.statusCode == 200) {
        setState(() {
          _lastRun = DateTime.now().toString().split('.').first;
        });
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text("Auto reply triggered successfully!")),
        );
      } else {
        final data = jsonDecode(response.body);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text(data['message'] ?? "Auto reply failed")),
        );
      }
    } catch (e) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text("An error occurred")),
      );
    } finally {
      setState(() => _isLoading = false);
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.darkBg,
      body: Center(
        child: SingleChildScrollView(
          padding: const EdgeInsets.all(24),
          child: Container(
            padding: const EdgeInsets.all(32),
            decoration: BoxDecoration(
              color: AppColors.cardBg,
              borderRadius: BorderRadius.circular(30),
              border: Border.all(color: Colors.white.withOpacity(0.1)),
            ),
            child: Column(
              mainAxisSize: MainAxisSize.min,
              children: [
                ShaderMask(
                  shaderCallback: (bounds) => const LinearGradient(
                    colors: [Colors.blue, Colors.pink],
                  ).createShader(bounds),
                  child: Text(
                    "Auto Reply",
                    style: GoogleFonts.nunito(
                      fontSize: 32,
                      fontWeight: FontWeight.bold,
                      color: Colors.white,
                    ),
                  ),
                ),
                const SizedBox(height: 32),
                Align(
                  alignment: Alignment.centerLeft,
                  child: Text(
                    "Auto Reply Limit",
                    style: GoogleFonts.nunito(color: Colors.white70, fontSize: 16),
                  ),
                ),
                const SizedBox(height: 8),
                TextField(
                  keyboardType: TextInputType.number,
                  style: const TextStyle(color: Colors.white),
                  onChanged: (value) => _limit = int.tryParse(value) ?? 20,
                  decoration: InputDecoration(
                    fillColor: Colors.black26,
                    hintText: "Enter limit",
                    hintStyle: TextStyle(color: Colors.white24),
                  ),
                ),
                const SizedBox(height: 32),
                SizedBox(
                  width: double.infinity,
                  child: ElevatedButton(
                    onPressed: _isLoading ? null : _triggerAutoReply,
                    style: ElevatedButton.styleFrom(
                      padding: const EdgeInsets.symmetric(vertical: 16),
                      backgroundColor: Colors.transparent,
                      shadowColor: Colors.transparent,
                    ).copyWith(
                      elevation: ButtonStyleButton.allOrNull(0),
                    ),
                    child: Ink(
                      decoration: BoxDecoration(
                        gradient: const LinearGradient(colors: [Colors.blue, Colors.pink]),
                        borderRadius: BorderRadius.circular(12),
                      ),
                      child: Container(
                        padding: const EdgeInsets.symmetric(vertical: 16),
                        alignment: Alignment.center,
                        child: Text(
                          _isLoading ? "Processing..." : "Start Auto Reply",
                          style: const TextStyle(fontWeight: FontWeight.bold, fontSize: 18),
                        ),
                      ),
                    ),
                  ),
                ),
                if (_lastRun.isNotEmpty) ...[
                  const SizedBox(height: 24),
                  Text(
                    "Last executed: $_lastRun",
                    style: const TextStyle(color: Colors.white54, fontSize: 14),
                  ),
                ],
                const SizedBox(height: 16),
                const Text(
                  "⏳ Auto-run happens every 1 hour",
                  style: TextStyle(color: Colors.blueAccent, fontWeight: FontWeight.bold),
                ),
              ],
            ),
          ),
        ),
      ),
    );
  }
}