import 'dart:convert';
import 'package:flutter/material.dart';
import 'package:geolocator/geolocator.dart';
import 'package:image_picker/image_picker.dart';
import '../api_service.dart';
import '../theme.dart';

class ClockScreen extends StatefulWidget {
  final ApiService api;
  final VoidCallback onAuthError;
  const ClockScreen({super.key, required this.api, required this.onAuthError});

  @override
  State<ClockScreen> createState() => _ClockScreenState();
}

class _ClockScreenState extends State<ClockScreen> {
  Today? _today;
  bool _loading = true;
  bool _busy = false;
  String? _selfie;

  @override
  void initState() {
    super.initState();
    _load();
  }

  Future<void> _load() async {
    try {
      final t = await widget.api.today();
      if (mounted) setState(() { _today = t; _loading = false; });
    } on ApiException catch (e) {
      if (e.status == 401) return widget.onAuthError();
      if (mounted) setState(() => _loading = false);
    }
  }

  Future<Position> _position() async {
    if (!await Geolocator.isLocationServiceEnabled()) {
      throw ApiException('Turn on location services to check in');
    }
    var perm = await Geolocator.checkPermission();
    if (perm == LocationPermission.denied) perm = await Geolocator.requestPermission();
    if (perm == LocationPermission.denied || perm == LocationPermission.deniedForever) {
      throw ApiException('Location permission is required to check in');
    }
    return Geolocator.getCurrentPosition();
  }

  Future<void> _selfieCapture() async {
    try {
      final XFile? x = await ImagePicker().pickImage(
          source: ImageSource.camera, preferredCameraDevice: CameraDevice.front, maxWidth: 640, imageQuality: 55);
      if (x != null) {
        final b = await x.readAsBytes();
        setState(() => _selfie = 'data:image/jpeg;base64,${base64Encode(b)}');
      }
    } catch (_) {
      _snack('Could not open camera');
    }
  }

  Future<void> _punch(bool checkIn) async {
    setState(() => _busy = true);
    try {
      final pos = await _position();
      if (checkIn) {
        await widget.api.checkIn(lat: pos.latitude, lng: pos.longitude, selfie: _selfie);
      } else {
        await widget.api.checkOut(lat: pos.latitude, lng: pos.longitude, selfie: _selfie);
      }
      _selfie = null;
      await _load();
      _snack(checkIn ? 'Checked in' : 'Checked out');
    } on ApiException catch (e) {
      if (e.status == 401) return widget.onAuthError();
      _snack(e.message);
    } finally {
      if (mounted) setState(() => _busy = false);
    }
  }

  void _snack(String m) {
    if (mounted) ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text(m)));
  }

  @override
  Widget build(BuildContext context) {
    if (_loading) return const Center(child: CircularProgressIndicator(color: AppColors.emerald));
    final t = _today;
    final checkedIn = t?.checkedIn ?? false;
    return RefreshIndicator(
      onRefresh: _load,
      color: AppColors.emerald,
      child: ListView(
        padding: const EdgeInsets.all(20),
        children: [
          const SizedBox(height: 8),
          Center(
            child: Container(
              width: 150, height: 150,
              decoration: BoxDecoration(
                shape: BoxShape.circle,
                color: (checkedIn ? AppColors.emerald : AppColors.muted).withValues(alpha: 0.10),
                border: Border.all(color: (checkedIn ? AppColors.emerald : AppColors.border), width: 3),
              ),
              child: Column(mainAxisAlignment: MainAxisAlignment.center, children: [
                Icon(checkedIn ? Icons.work_history : Icons.co_present, color: checkedIn ? AppColors.emerald : AppColors.muted, size: 40),
                const SizedBox(height: 6),
                Text(checkedIn ? 'Working' : (t?.checkOut != null ? 'Done' : 'Not in'),
                    style: TextStyle(fontWeight: FontWeight.bold, color: checkedIn ? AppColors.emerald : AppColors.navy)),
              ]),
            ),
          ),
          const SizedBox(height: 20),
          Card(
            child: Padding(
              padding: const EdgeInsets.all(16),
              child: Row(mainAxisAlignment: MainAxisAlignment.spaceAround, children: [
                _stat('In', t?.checkIn ?? '—'),
                _stat('Out', t?.checkOut ?? '—'),
                _stat('Hours', t?.hours == null ? '—' : '${t!.hours}'),
              ]),
            ),
          ),
          const SizedBox(height: 12),
          if (t?.lateMinutes != null && t!.lateMinutes! > 0)
            Center(child: Text('Late by ${t.lateMinutes} min', style: const TextStyle(color: AppColors.danger, fontSize: 12))),
          const SizedBox(height: 20),
          // selfie row
          Row(children: [
            GestureDetector(
              onTap: _selfieCapture,
              child: Container(
                width: 54, height: 54,
                decoration: BoxDecoration(
                  color: AppColors.surface, borderRadius: BorderRadius.circular(12),
                  border: Border.all(color: AppColors.border),
                  image: _selfie != null ? DecorationImage(image: MemoryImage(base64Decode(_selfie!.split(',').last)), fit: BoxFit.cover) : null,
                ),
                child: _selfie == null ? const Icon(Icons.camera_alt_outlined, color: AppColors.muted) : null,
              ),
            ),
            const SizedBox(width: 12),
            Expanded(
              child: Text(_selfie == null ? 'Tap to add a selfie (if your office requires one)' : 'Selfie attached',
                  style: const TextStyle(fontSize: 12, color: AppColors.muted)),
            ),
          ]),
          const SizedBox(height: 20),
          FilledButton.icon(
            onPressed: _busy ? null : () => _punch(!checkedIn),
            style: FilledButton.styleFrom(backgroundColor: checkedIn ? AppColors.danger : AppColors.emerald),
            icon: _busy
                ? const SizedBox(height: 20, width: 20, child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white))
                : Icon(checkedIn ? Icons.logout : Icons.login),
            label: Text(_busy ? 'Please wait…' : (checkedIn ? 'Check out' : 'Check in')),
          ),
          const SizedBox(height: 10),
          const Center(child: Text('Your location is captured to confirm office presence.',
              textAlign: TextAlign.center, style: TextStyle(fontSize: 11, color: AppColors.muted))),
        ],
      ),
    );
  }

  Widget _stat(String label, String value) {
    return Column(children: [
      Text(value, style: const TextStyle(fontSize: 18, fontWeight: FontWeight.bold, color: AppColors.navy)),
      Text(label, style: const TextStyle(fontSize: 11, color: AppColors.muted)),
    ]);
  }
}