import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:get/get.dart';
import 'package:intl/intl.dart';

import 'package:marco/controller/employee/add_employee_controller.dart';
import 'package:marco/controller/employee/employees_screen_controller.dart';
import 'package:marco/controller/tenant/organization_selection_controller.dart';
import 'package:marco/helpers/utils/base_bottom_sheet.dart';
import 'package:marco/helpers/utils/mixins/ui_mixin.dart';
import 'package:marco/helpers/widgets/my_snackbar.dart';
import 'package:marco/helpers/widgets/my_spacing.dart';
import 'package:marco/helpers/widgets/my_text.dart';
import 'package:marco/helpers/widgets/my_text_style.dart';

class AddEmployeeBottomSheet extends StatefulWidget {
  final Map<String, dynamic>? employeeData;
  const AddEmployeeBottomSheet({super.key, this.employeeData});

  @override
  State<AddEmployeeBottomSheet> createState() => _AddEmployeeBottomSheetState();
}

class _AddEmployeeBottomSheetState extends State<AddEmployeeBottomSheet>
    with UIMixin {
  late final AddEmployeeController _controller;
  final OrganizationController _organizationController =
      Get.put(OrganizationController());

  // Local UI state
  bool _hasApplicationAccess = false;

  // Local read-only controllers to avoid recreating TextEditingController in build
  late final TextEditingController _orgFieldController;
  late final TextEditingController _joiningDateController;
  late final TextEditingController _genderController;
  late final TextEditingController _roleController;

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

    _controller = Get.put(
      AddEmployeeController(),
      // Unique tag to avoid clashes, but stable for this widget instance
      tag: UniqueKey().toString(),
    );

    _orgFieldController = TextEditingController(text: '');
    _joiningDateController = TextEditingController(text: '');
    _genderController = TextEditingController(text: '');
    _roleController = TextEditingController(text: '');

    // Prefill when editing
    if (widget.employeeData != null) {
      _controller.editingEmployeeData = widget.employeeData;
      _controller.prefillFields();

      final orgId = widget.employeeData!['organizationId'];
      if (orgId != null) {
        _controller.selectedOrganizationId = orgId;

        final selectedOrg = _organizationController.organizations
            .firstWhereOrNull((o) => o.id == orgId);
        if (selectedOrg != null) {
          _organizationController.selectOrganization(selectedOrg);
          _orgFieldController.text = selectedOrg.name;
        }
      }

      if (_controller.joiningDate != null) {
        _joiningDateController.text =
            DateFormat('dd MMM yyyy').format(_controller.joiningDate!);
      }

      if (_controller.selectedGender != null) {
        _genderController.text =
            _controller.selectedGender!.name.capitalizeFirst ?? '';
      }

      final roleName = _controller.roles.firstWhereOrNull(
              (r) => r['id'] == _controller.selectedRoleId)?['name'] ??
          '';
      _roleController.text = roleName;
    } else {
      _orgFieldController.text = _organizationController.currentSelection;
    }
  }

  @override
  void dispose() {
    _orgFieldController.dispose();
    _joiningDateController.dispose();
    _genderController.dispose();
    _roleController.dispose();
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return GetBuilder<AddEmployeeController>(
      init: _controller,
      builder: (_) {
        // Keep org field in sync with controller selection
        _orgFieldController.text = _organizationController.currentSelection;

        return BaseBottomSheet(
          title: widget.employeeData != null ? 'Edit Employee' : 'Add Employee',
          onCancel: () => Navigator.pop(context),
          onSubmit: _handleSubmit,
          child: Form(
            key: _controller.basicValidator.formKey,
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                _sectionLabel('Personal Info'),
                MySpacing.height(16),
                _inputWithIcon(
                  label: 'First Name',
                  hint: 'e.g., John',
                  icon: Icons.person,
                  controller:
                      _controller.basicValidator.getController('first_name')!,
                  validator:
                      _controller.basicValidator.getValidation('first_name'),
                ),
                MySpacing.height(16),
                _inputWithIcon(
                  label: 'Last Name',
                  hint: 'e.g., Doe',
                  icon: Icons.person_outline,
                  controller:
                      _controller.basicValidator.getController('last_name')!,
                  validator:
                      _controller.basicValidator.getValidation('last_name'),
                ),
                MySpacing.height(16),
                _sectionLabel('Organization'),
                MySpacing.height(8),
                GestureDetector(
                  onTap: () => _showOrganizationPopup(context),
                  child: AbsorbPointer(
                    child: TextFormField(
                      readOnly: true,
                      controller: _orgFieldController,
                      validator: (val) {
                        if (val == null ||
                            val.trim().isEmpty ||
                            val == 'All Organizations') {
                          return 'Organization is required';
                        }
                        return null;
                      },
                      decoration:
                          _inputDecoration('Select Organization').copyWith(
                        suffixIcon: const Icon(Icons.expand_more),
                      ),
                    ),
                  ),
                ),
                MySpacing.height(24),
                _sectionLabel('Application Access'),
                Row(
                  children: [
                    Checkbox(
                      value: _hasApplicationAccess,
                      onChanged: (val) {
                        setState(() => _hasApplicationAccess = val ?? false);
                      },
                      fillColor:
                          WidgetStateProperty.resolveWith<Color>((states) {
                        if (states.contains(WidgetState.selected)) {
                          return Colors.indigo;
                        }
                        return Colors.white;
                      }),
                      side: WidgetStateBorderSide.resolveWith((states) {
                        if (states.contains(WidgetState.selected)) {
                          return BorderSide.none;
                        }
                        return const BorderSide(
                          color: Colors.black,
                          width: 2,
                        );
                      }),
                      checkColor: Colors.white,
                    ),
                    MyText.bodyMedium(
                      'Has Application Access',
                      fontWeight: 600,
                    ),
                  ],
                ),
                MySpacing.height(8),
                _buildEmailField(),
                MySpacing.height(12),
                _sectionLabel('Joining Details'),
                MySpacing.height(16),
                _buildDatePickerField(
                  label: 'Joining Date',
                  controller: _joiningDateController,
                  hint: 'Select Joining Date',
                  onTap: () => _pickJoiningDate(context),
                ),
                MySpacing.height(16),
                _sectionLabel('Contact Details'),
                MySpacing.height(16),
                _buildPhoneInput(context),
                MySpacing.height(24),
                _sectionLabel('Other Details'),
                MySpacing.height(16),
                _buildDropdownField(
                  label: 'Gender',
                  controller: _genderController,
                  hint: 'Select Gender',
                  onTap: () => _showGenderPopup(context),
                ),
                MySpacing.height(16),
                _buildDropdownField(
                  label: 'Role',
                  controller: _roleController,
                  hint: 'Select Role',
                  onTap: () => _showRolePopup(context),
                ),
              ],
            ),
          ),
        );
      },
    );
  }

  // UI Pieces

  Widget _sectionLabel(String title) => Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          MyText.labelLarge(title, fontWeight: 600),
          MySpacing.height(4),
          Divider(thickness: 1, color: Colors.grey.shade200),
        ],
      );

  Widget _requiredLabel(String text) {
    return Row(
      children: [
        MyText.labelMedium(text),
        const SizedBox(width: 4),
        const Text('*', style: TextStyle(color: Colors.red)),
      ],
    );
  }

  InputDecoration _inputDecoration(String hint) {
    return InputDecoration(
      hintText: hint,
      hintStyle: MyTextStyle.bodySmall(xMuted: true),
      filled: true,
      fillColor: Colors.grey.shade100,
      border: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: BorderSide(color: Colors.grey.shade300),
      ),
      enabledBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: BorderSide(color: Colors.grey.shade300),
      ),
      focusedBorder: OutlineInputBorder(
        borderRadius: BorderRadius.circular(12),
        borderSide: const BorderSide(color: Colors.blueAccent, width: 1.5),
      ),
      contentPadding: MySpacing.all(16),
    );
  }

  Widget _inputWithIcon({
    required String label,
    required String hint,
    required IconData icon,
    required TextEditingController controller,
    required String? Function(String?)? validator,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _requiredLabel(label),
        MySpacing.height(8),
        TextFormField(
          controller: controller,
          validator: (val) {
            if (val == null || val.trim().isEmpty) {
              return '$label is required';
            }
            return validator?.call(val);
          },
          decoration: _inputDecoration(hint).copyWith(
            prefixIcon: Icon(icon, size: 20),
          ),
        ),
      ],
    );
  }

  Widget _buildEmailField() {
    final emailController = _controller.basicValidator.getController('email') ??
        TextEditingController();

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        Row(
          children: [
            MyText.labelMedium('Email'),
            const SizedBox(width: 4),
            if (_hasApplicationAccess)
              const Text('*', style: TextStyle(color: Colors.red)),
          ],
        ),
        MySpacing.height(8),
        TextFormField(
          controller: emailController,
          validator: (val) {
            if (_hasApplicationAccess) {
              if (val == null || val.trim().isEmpty) {
                return 'Email is required for application users';
              }
              final email = val.trim();
              if (!RegExp(r'^[\w\-\.]+@([\w\-]+\.)+[\w\-]{2,4}$')
                  .hasMatch(email)) {
                return 'Enter a valid email address';
              }
            }
            return null;
          },
          keyboardType: TextInputType.emailAddress,
          decoration: _inputDecoration('e.g., john.doe@example.com').copyWith(
          ),
        ),
      ],
    );
  }

  Widget _buildDatePickerField({
    required String label,
    required TextEditingController controller,
    required String hint,
    required VoidCallback onTap,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _requiredLabel(label),
        MySpacing.height(8),
        GestureDetector(
          onTap: onTap,
          child: AbsorbPointer(
            child: TextFormField(
              readOnly: true,
              controller: controller,
              validator: (val) {
                if (val == null || val.trim().isEmpty) {
                  return '$label is required';
                }
                return null;
              },
              decoration: _inputDecoration(hint).copyWith(
                suffixIcon: const Icon(Icons.calendar_today),
              ),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildDropdownField({
    required String label,
    required TextEditingController controller,
    required String hint,
    required VoidCallback onTap,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _requiredLabel(label),
        MySpacing.height(8),
        GestureDetector(
          onTap: onTap,
          child: AbsorbPointer(
            child: TextFormField(
              readOnly: true,
              controller: controller,
              validator: (val) {
                if (val == null || val.trim().isEmpty) {
                  return '$label is required';
                }
                return null;
              },
              decoration: _inputDecoration(hint).copyWith(
                suffixIcon: const Icon(Icons.expand_more),
              ),
            ),
          ),
        ),
      ],
    );
  }

  Widget _buildPhoneInput(BuildContext context) {
    final phoneController =
        _controller.basicValidator.getController('phone_number');

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _requiredLabel('Phone Number'),
        MySpacing.height(8),
        Row(
          children: [
            Container(
              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 14),
              decoration: BoxDecoration(
                border: Border.all(color: Colors.grey.shade300),
                borderRadius: BorderRadius.circular(12),
                color: Colors.grey.shade100,
              ),
              child: const Text('+91'),
            ),
            MySpacing.width(12),
            Expanded(
              child: TextFormField(
                controller: phoneController,
                validator: (value) {
                  final v = value?.trim() ?? '';
                  if (v.isEmpty) return 'Phone Number is required';
                  if (v.length != 10)
                    return 'Phone Number must be exactly 10 digits';
                  if (!RegExp(r'^\d{10}$').hasMatch(v)) {
                    return 'Enter a valid 10-digit number';
                  }
                  return null;
                },
                keyboardType: TextInputType.number,
                inputFormatters: [
                  FilteringTextInputFormatter.digitsOnly,
                  LengthLimitingTextInputFormatter(10),
                ],
                decoration: _inputDecoration('e.g., 9876543210').copyWith(
                  suffixIcon: IconButton(
                    icon: const Icon(Icons.contacts),
                    onPressed: () => _controller.pickContact(context),
                  ),
                ),
              ),
            ),
          ],
        ),
      ],
    );
  }

  // Actions

  Future<void> _pickJoiningDate(BuildContext context) async {
    final picked = await showDatePicker(
      context: context,
      initialDate: _controller.joiningDate ?? DateTime.now(),
      firstDate: DateTime(2000),
      lastDate: DateTime(2100),
    );

    if (picked != null) {
      _controller.setJoiningDate(picked);
      _joiningDateController.text = DateFormat('dd MMM yyyy').format(picked);
      _controller.update();
    }
  }

  Future<void> _handleSubmit() async {
    final isValid =
        _controller.basicValidator.formKey.currentState?.validate() ?? false;

    if (!isValid ||
        _controller.joiningDate == null ||
        _controller.selectedGender == null ||
        _controller.selectedRoleId == null ||
        _organizationController.currentSelection.isEmpty ||
        _organizationController.currentSelection == 'All Organizations') {
      showAppSnackbar(
        title: 'Missing Fields',
        message: 'Please complete all required fields.',
        type: SnackbarType.warning,
      );
      return;
    }

    final result = await _controller.createOrUpdateEmployee(
      email: _controller.basicValidator.getController('email')?.text.trim(),
      hasApplicationAccess: _hasApplicationAccess,
    );

    if (result != null && result['success'] == true) {
      final employeeController = Get.find<EmployeesScreenController>();
      final projectId = employeeController.selectedProjectId;

      if (projectId == null) {
        await employeeController.fetchAllEmployees();
      } else {
        await employeeController.fetchEmployeesByProject(projectId);
      }

      employeeController.update(['employee_screen_controller']);
      if (mounted) Navigator.pop(context, result['data']);
    }
  }

  void _showOrganizationPopup(BuildContext context) async {
    final orgs = _organizationController.organizations;

    if (orgs.isEmpty) {
      showAppSnackbar(
        title: 'No Organizations',
        message: 'No organizations available to select.',
        type: SnackbarType.warning,
      );
      return;
    }

    final selected = await showMenu<String>(
      context: context,
      position: _popupMenuPosition(context),
      items: orgs
          .map(
            (org) => PopupMenuItem<String>(
              value: org.id,
              child: Text(org.name),
            ),
          )
          .toList(),
    );

    if (selected != null && selected.trim().isNotEmpty) {
      final chosen = orgs.firstWhere((e) => e.id == selected);
      _organizationController.selectOrganization(chosen);
      _controller.selectedOrganizationId = chosen.id;
      _orgFieldController.text = chosen.name;
      _controller.update();
    }
  }

  void _showGenderPopup(BuildContext context) async {
    final selected = await showMenu<Gender>(
      context: context,
      position: _popupMenuPosition(context),
      items: Gender.values
          .map(
            (gender) => PopupMenuItem<Gender>(
              value: gender,
              child: Text(gender.name.capitalizeFirst!),
            ),
          )
          .toList(),
    );

    if (selected != null) {
      _controller.onGenderSelected(selected);
      _genderController.text = selected.name.capitalizeFirst ?? '';
      _controller.update();
    }
  }

  void _showRolePopup(BuildContext context) async {
    final selected = await showMenu<String>(
      context: context,
      position: _popupMenuPosition(context),
      items: _controller.roles
          .map(
            (role) => PopupMenuItem<String>(
              value: role['id'],
              child: Text(role['name']),
            ),
          )
          .toList(),
    );

    if (selected != null) {
      _controller.onRoleSelected(selected);
      final roleName = _controller.roles
              .firstWhereOrNull((r) => r['id'] == selected)?['name'] ??
          '';
      _roleController.text = roleName;
      _controller.update();
    }
  }

  RelativeRect _popupMenuPosition(BuildContext context) {
    final RenderBox overlay =
        Overlay.of(context).context.findRenderObject() as RenderBox;
    return RelativeRect.fromLTRB(100, 300, overlay.size.width - 100, 0);
  }
}
