import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:marco/controller/expense/add_expense_controller.dart';
import 'package:marco/helpers/widgets/my_text.dart';
import 'package:marco/model/expense/payment_types_model.dart';
import 'package:marco/model/expense/expense_type_model.dart';
import 'package:marco/model/expense/expense_status_model.dart';

void showAddExpenseBottomSheet() {
  Get.bottomSheet(
    const _AddExpenseBottomSheet(),
    isScrollControlled: true,
  );
}

class _AddExpenseBottomSheet extends StatefulWidget {
  const _AddExpenseBottomSheet();

  @override
  State<_AddExpenseBottomSheet> createState() => _AddExpenseBottomSheetState();
}

class _AddExpenseBottomSheetState extends State<_AddExpenseBottomSheet> {
  final AddExpenseController controller = Get.put(AddExpenseController());
  final RxBool isProjectExpanded = false.obs;
  void _showEmployeeList(BuildContext context) {
    final employees = controller.allEmployees;

    showModalBottomSheet(
      context: context,
      backgroundColor: Colors.white,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
      ),
      builder: (BuildContext context) {
        return Obx(() {
          return SizedBox(
            height: 300,
            child: ListView.builder(
              itemCount: employees.length,
              itemBuilder: (context, index) {
                final emp = employees[index];
                final fullName = '${emp.firstName} ${emp.lastName}'.trim();

                return ListTile(
                  title: Text(fullName.isNotEmpty ? fullName : "Unnamed"),
                  onTap: () {
                    controller.selectedPaidBy.value = emp;
                    Navigator.pop(context);
                  },
                );
              },
            ),
          );
        });
      },
    );
  }

  @override
  Widget build(BuildContext context) {
    return SafeArea(
      child: Padding(
        padding: const EdgeInsets.only(top: 60),
        child: Material(
          color: Colors.white,
          borderRadius: const BorderRadius.vertical(top: Radius.circular(20)),
          child: Stack(
            children: [
              Obx(() {
                return SingleChildScrollView(
                  padding: const EdgeInsets.fromLTRB(16, 12, 16, 24),
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    children: [
                      _buildDragHandle(),
                      Center(
                        child: MyText.titleLarge(
                          "Add Expense",
                          fontWeight: 700,
                        ),
                      ),
                      const SizedBox(height: 20),

                      // Project Dropdown
                      const _SectionTitle(
                          icon: Icons.work_outline, title: "Project"),
                      const SizedBox(height: 6),
                      Obx(() {
                        return _DropdownTile(
                          title: controller.selectedProject.value.isEmpty
                              ? "Select Project"
                              : controller.selectedProject.value,
                          onTap: () => _showOptionList<String>(
                            context,
                            controller.globalProjects.toList(),
                            (p) => p,
                            (val) => controller.selectedProject.value = val,
                          ),
                        );
                      }),
                      const SizedBox(height: 16),

                      // Expense Type & GST
                      const _SectionTitle(
                        icon: Icons.category_outlined,
                        title: "Expense Type & GST No.",
                      ),
                      const SizedBox(height: 6),
                      Obx(() {
                        return _DropdownTile(
                          title: controller.selectedExpenseType.value?.name ??
                              "Select Expense Type",
                          onTap: () => _showOptionList<ExpenseTypeModel>(
                            context,
                            controller.expenseTypes.toList(),
                            (e) => e.name,
                            (val) => controller.selectedExpenseType.value = val,
                          ),
                        );
                      }),
                      const SizedBox(height: 8),
                      _CustomTextField(
                        controller: controller.gstController,
                        hint: "Enter GST No.",
                      ),
                      const SizedBox(height: 16),

                      // Payment Mode
                      const _SectionTitle(
                          icon: Icons.payment, title: "Payment Mode"),
                      const SizedBox(height: 6),
                      Obx(() {
                        return _DropdownTile(
                          title: controller.selectedPaymentMode.value?.name ??
                              "Select Payment Mode",
                          onTap: () => _showOptionList<PaymentModeModel>(
                            context,
                            controller.paymentModes.toList(),
                            (m) => m.name,
                            (val) => controller.selectedPaymentMode.value = val,
                          ),
                        );
                      }),
                      const SizedBox(height: 16),
                      Obx(() {
                        final selected = controller.selectedPaidBy.value;
                        return GestureDetector(
                          onTap: () => _showEmployeeList(context),
                          child: Container(
                            padding: const EdgeInsets.symmetric(
                                horizontal: 12, vertical: 14),
                            decoration: BoxDecoration(
                              color: Colors.grey.shade100,
                              borderRadius: BorderRadius.circular(8),
                              border: Border.all(color: Colors.grey.shade400),
                            ),
                            child: Row(
                              mainAxisAlignment: MainAxisAlignment.spaceBetween,
                              children: [
                                Text(
                                  selected == null
                                      ? "Select Paid By"
                                      : '${selected.firstName} ${selected.lastName}',
                                  style: const TextStyle(fontSize: 14),
                                ),
                                const Icon(Icons.arrow_drop_down, size: 22),
                              ],
                            ),
                          ),
                        );
                      }),
                      const SizedBox(height: 16),
                      // Expense Status
                      const _SectionTitle(
                          icon: Icons.flag_outlined, title: "Status"),
                      const SizedBox(height: 6),
                      Obx(() {
                        return _DropdownTile(
                          title: controller.selectedExpenseStatus.value?.name ??
                              "Select Status",
                          onTap: () => _showOptionList<ExpenseStatusModel>(
                            context,
                            controller.expenseStatuses.toList(),
                            (s) => s.name,
                            (val) =>
                                controller.selectedExpenseStatus.value = val,
                          ),
                        );
                      }),
                      const SizedBox(height: 16),

                      // Amount
                      const _SectionTitle(
                          icon: Icons.currency_rupee, title: "Amount"),
                      const SizedBox(height: 6),
                      _CustomTextField(
                        controller: controller.amountController,
                        hint: "Enter Amount",
                        keyboardType: TextInputType.number,
                      ),
                      const SizedBox(height: 16),
                      // Supplier Name
                      const _SectionTitle(
                        icon: Icons.store_mall_directory_outlined,
                        title: "Supplier Name",
                      ),
                      const SizedBox(height: 6),
                      _CustomTextField(
                        controller: controller.supplierController,
                        hint: "Enter Supplier Name",
                      ),
                      const SizedBox(height: 16),
                      // Transaction ID
                      const _SectionTitle(
                          icon: Icons.confirmation_number_outlined,
                          title: "Transaction ID"),
                      const SizedBox(height: 6),
                      _CustomTextField(
                        controller: controller.transactionIdController,
                        hint: "Enter Transaction ID",
                      ),
                      const SizedBox(height: 16),

                      // Location
                      const _SectionTitle(
                        icon: Icons.location_on_outlined,
                        title: "Location",
                      ),
                      const SizedBox(height: 6),
                      TextField(
                        controller: controller.locationController,
                        decoration: InputDecoration(
                          hintText: "Enter Location",
                          filled: true,
                          fillColor: Colors.grey.shade100,
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(8),
                          ),
                          contentPadding: const EdgeInsets.symmetric(
                              horizontal: 12, vertical: 10),
                          suffixIcon: controller.isFetchingLocation.value
                              ? const Padding(
                                  padding: EdgeInsets.all(12),
                                  child: SizedBox(
                                    width: 18,
                                    height: 18,
                                    child: CircularProgressIndicator(
                                        strokeWidth: 2),
                                  ),
                                )
                              : IconButton(
                                  icon: const Icon(Icons.my_location),
                                  tooltip: "Use Current Location",
                                  onPressed: controller.fetchCurrentLocation,
                                ),
                        ),
                      ),

                      const SizedBox(height: 16),
                      // Attachments Section
                      const _SectionTitle(
                          icon: Icons.attach_file, title: "Attachments"),
                      const SizedBox(height: 6),

                      Obx(() {
                        return Wrap(
                          spacing: 8,
                          runSpacing: 8,
                          children: [
                            ...controller.attachments.map((file) {
                              final fileName = file.path.split('/').last;
                              final extension =
                                  fileName.split('.').last.toLowerCase();

                              final isImage =
                                  ['jpg', 'jpeg', 'png'].contains(extension);

                              IconData fileIcon;
                              Color iconColor = Colors.blueAccent;
                              switch (extension) {
                                case 'pdf':
                                  fileIcon = Icons.picture_as_pdf;
                                  iconColor = Colors.redAccent;
                                  break;
                                case 'doc':
                                case 'docx':
                                  fileIcon = Icons.description;
                                  iconColor = Colors.blueAccent;
                                  break;
                                case 'xls':
                                case 'xlsx':
                                  fileIcon = Icons.table_chart;
                                  iconColor = Colors.green;
                                  break;
                                case 'txt':
                                  fileIcon = Icons.article;
                                  iconColor = Colors.grey;
                                  break;
                                default:
                                  fileIcon = Icons.insert_drive_file;
                                  iconColor = Colors.blueGrey;
                              }

                              return Stack(
                                children: [
                                  Container(
                                    width: 80,
                                    height: 80,
                                    decoration: BoxDecoration(
                                      borderRadius: BorderRadius.circular(8),
                                      border: Border.all(
                                          color: Colors.grey.shade300),
                                      color: Colors.grey.shade100,
                                    ),
                                    child: isImage
                                        ? ClipRRect(
                                            borderRadius:
                                                BorderRadius.circular(8),
                                            child: Image.file(file,
                                                fit: BoxFit.cover),
                                          )
                                        : Column(
                                            mainAxisAlignment:
                                                MainAxisAlignment.center,
                                            children: [
                                              Icon(fileIcon,
                                                  color: iconColor, size: 30),
                                              const SizedBox(height: 4),
                                              Text(
                                                extension.toUpperCase(),
                                                style: TextStyle(
                                                  fontSize: 10,
                                                  fontWeight: FontWeight.bold,
                                                  color: iconColor,
                                                ),
                                                overflow: TextOverflow.ellipsis,
                                              ),
                                            ],
                                          ),
                                  ),
                                  Positioned(
                                    top: -6,
                                    right: -6,
                                    child: IconButton(
                                      icon: const Icon(Icons.close,
                                          color: Colors.red, size: 18),
                                      onPressed: () =>
                                          controller.removeAttachment(file),
                                    ),
                                  ),
                                ],
                              );
                            }).toList(),
                            GestureDetector(
                              onTap: controller.pickAttachments,
                              child: Container(
                                width: 80,
                                height: 80,
                                decoration: BoxDecoration(
                                  border:
                                      Border.all(color: Colors.grey.shade400),
                                  borderRadius: BorderRadius.circular(8),
                                  color: Colors.grey.shade100,
                                ),
                                child: const Icon(Icons.add,
                                    size: 30, color: Colors.grey),
                              ),
                            ),
                          ],
                        );
                      }),
                      const SizedBox(height: 16),

                      // Description
                      const _SectionTitle(
                        icon: Icons.description_outlined,
                        title: "Description",
                      ),
                      const SizedBox(height: 6),
                      _CustomTextField(
                        controller: controller.descriptionController,
                        hint: "Enter Description",
                        maxLines: 3,
                      ),
                      const SizedBox(height: 24),

                      // Action Buttons
                      Row(
                        children: [
                          Expanded(
                            child: OutlinedButton.icon(
                              onPressed: () => Get.back(),
                              icon: const Icon(Icons.close, size: 18),
                              label:
                                  MyText.bodyMedium("Cancel", fontWeight: 600),
                              style: OutlinedButton.styleFrom(
                                minimumSize:
                                    const Size.fromHeight(48), 
                              ),
                            ),
                          ),
                          const SizedBox(width: 12),
                          Expanded(
                            child: ElevatedButton.icon(
                              onPressed: controller.submitExpense,
                              icon: const Icon(Icons.check, size: 18),
                              label: MyText.bodyMedium(
                                "Submit",
                                color: Colors.white,
                                fontWeight: 600,
                              ),
                              style: ElevatedButton.styleFrom(
                                backgroundColor: Colors.indigo,
                                shape: RoundedRectangleBorder(
                                  borderRadius: BorderRadius.circular(8),
                                ),
                                padding:
                                    const EdgeInsets.symmetric(vertical: 14),
                                minimumSize:
                                    const Size.fromHeight(48), 
                              ),
                            ),
                          ),
                        ],
                      )
                    ],
                  ),
                );
              }),

              // Project Selection List
              Obx(() {
                if (!isProjectExpanded.value) return const SizedBox.shrink();
                return Positioned(
                  top: 110,
                  left: 16,
                  right: 16,
                  child: Material(
                    elevation: 4,
                    borderRadius: BorderRadius.circular(12),
                    child: Container(
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(12),
                      ),
                      padding: const EdgeInsets.all(10),
                      child: _buildProjectSelectionList(),
                    ),
                  ),
                );
              }),
            ],
          ),
        ),
      ),
    );
  }

  Widget _buildProjectSelectionList() {
    return ConstrainedBox(
      constraints: const BoxConstraints(maxHeight: 300),
      child: ListView.builder(
        shrinkWrap: true,
        itemCount: controller.globalProjects.length,
        itemBuilder: (context, index) {
          final project = controller.globalProjects[index];
          final isSelected = project == controller.selectedProject.value;

          return RadioListTile<String>(
            value: project,
            groupValue: controller.selectedProject.value,
            onChanged: (val) {
              controller.selectedProject.value = val!;
              isProjectExpanded.value = false;
            },
            title: Text(
              project,
              style: TextStyle(
                fontWeight: isSelected ? FontWeight.bold : FontWeight.normal,
                color: isSelected ? Colors.blueAccent : Colors.black87,
              ),
            ),
            activeColor: Colors.blueAccent,
            tileColor: isSelected
                ? Colors.blueAccent.withOpacity(0.1)
                : Colors.transparent,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(6),
            ),
            visualDensity: const VisualDensity(vertical: -4),
          );
        },
      ),
    );
  }

  Future<void> _showOptionList<T>(
    BuildContext context,
    List<T> options,
    String Function(T) getLabel,
    ValueChanged<T> onSelected,
  ) async {
    final RenderBox button = context.findRenderObject() as RenderBox;
    final RenderBox overlay =
        Overlay.of(context).context.findRenderObject() as RenderBox;

    final Offset position =
        button.localToGlobal(Offset.zero, ancestor: overlay);
    final selected = await showMenu<T>(
      context: context,
      position: RelativeRect.fromLTRB(
        position.dx,
        position.dy + button.size.height,
        position.dx + button.size.width,
        0,
      ),
      shape: RoundedRectangleBorder(borderRadius: BorderRadius.circular(8)),
      items: options.map((option) {
        return PopupMenuItem<T>(
          value: option,
          child: Text(getLabel(option)),
        );
      }).toList(),
    );

    if (selected != null) onSelected(selected);
  }

  Widget _buildDragHandle() => Center(
        child: Container(
          width: 40,
          height: 4,
          margin: const EdgeInsets.only(bottom: 16),
          decoration: BoxDecoration(
            color: Colors.grey.shade400,
            borderRadius: BorderRadius.circular(2),
          ),
        ),
      );
}

class _SectionTitle extends StatelessWidget {
  final IconData icon;
  final String title;
  const _SectionTitle({required this.icon, required this.title});

  @override
  Widget build(BuildContext context) {
    final color = Colors.grey[700];
    return Row(
      children: [
        Icon(icon, color: color, size: 18),
        const SizedBox(width: 8),
        MyText.bodyMedium(title, fontWeight: 600),
      ],
    );
  }
}

class _CustomTextField extends StatelessWidget {
  final TextEditingController controller;
  final String hint;
  final int maxLines;
  final TextInputType keyboardType;

  const _CustomTextField({
    required this.controller,
    required this.hint,
    this.maxLines = 1,
    this.keyboardType = TextInputType.text,
  });

  @override
  Widget build(BuildContext context) {
    return TextField(
      controller: controller,
      maxLines: maxLines,
      keyboardType: keyboardType,
      decoration: InputDecoration(
        hintText: hint,
        filled: true,
        fillColor: Colors.grey.shade100,
        border: OutlineInputBorder(borderRadius: BorderRadius.circular(8)),
        contentPadding:
            const EdgeInsets.symmetric(horizontal: 12, vertical: 10),
      ),
    );
  }
}

class _DropdownTile extends StatelessWidget {
  final String title;
  final VoidCallback onTap;

  const _DropdownTile({
    required this.title,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 14),
        decoration: BoxDecoration(
          color: Colors.grey.shade100,
          borderRadius: BorderRadius.circular(8),
          border: Border.all(color: Colors.grey.shade300),
        ),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.spaceBetween,
          children: [
            Expanded(
              child: Text(
                title,
                style: const TextStyle(fontSize: 14, color: Colors.black87),
                overflow: TextOverflow.ellipsis,
              ),
            ),
            const Icon(Icons.arrow_drop_down),
          ],
        ),
      ),
    );
  }
}