import 'dart:io';
import 'package:flutter/material.dart';
import 'package:get/get.dart';
import 'package:marco/controller/expense/add_expense_controller.dart';
import 'package:marco/model/expense/expense_type_model.dart';
import 'package:marco/model/expense/payment_types_model.dart';
import 'package:marco/model/expense/employee_selector_bottom_sheet.dart';
import 'package:marco/helpers/widgets/my_spacing.dart';
import 'package:marco/helpers/utils/base_bottom_sheet.dart';
import 'package:url_launcher/url_launcher_string.dart';
import 'package:marco/helpers/widgets/my_snackbar.dart';
import 'package:marco/helpers/widgets/image_viewer_dialog.dart';

Future<T?> showAddExpenseBottomSheet<T>({
  bool isEdit = false,
  Map<String, dynamic>? existingExpense,
}) {
  return Get.bottomSheet<T>(
    _AddExpenseBottomSheet(
      isEdit: isEdit,
      existingExpense: existingExpense,
    ),
    isScrollControlled: true,
  );
}

class _AddExpenseBottomSheet extends StatefulWidget {
  final bool isEdit;
  final Map<String, dynamic>? existingExpense;

  const _AddExpenseBottomSheet({
    this.isEdit = false,
    this.existingExpense,
  });

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

class _AddExpenseBottomSheetState extends State<_AddExpenseBottomSheet> {
  final AddExpenseController controller = Get.put(AddExpenseController());

  void _showEmployeeList() async {
    await showModalBottomSheet(
      context: context,
      isScrollControlled: true,
      shape: const RoundedRectangleBorder(
        borderRadius: BorderRadius.vertical(top: Radius.circular(16)),
      ),
      backgroundColor: Colors.transparent,
      builder: (_) => EmployeeSelectorBottomSheet(),
    );

    // Optional cleanup
    controller.employeeSearchController.clear();
    controller.employeeSearchResults.clear();
  }

  Future<void> _showOptionList<T>(
    List<T> options,
    String Function(T) getLabel,
    ValueChanged<T> onSelected,
  ) async {
    final button = context.findRenderObject() as RenderBox;
    final overlay = Overlay.of(context).context.findRenderObject() as RenderBox;
    final 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) => PopupMenuItem<T>(
              value: option,
              child: Text(getLabel(option)),
            ),
          )
          .toList(),
    );

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

  @override
  Widget build(BuildContext context) {
    return Obx(() {
      return BaseBottomSheet(
        title: widget.isEdit ? "Edit Expense" : "Add Expense",
        isSubmitting: controller.isSubmitting.value,
        onCancel: Get.back,
        onSubmit: () {
          if (!controller.isSubmitting.value) {
            controller.submitOrUpdateExpense();
          }
        },
        child: Column(
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            _buildDropdown<String>(
              icon: Icons.work_outline,
              title: "Project",
              requiredField: true,
              value: controller.selectedProject.value.isEmpty
                  ? "Select Project"
                  : controller.selectedProject.value,
              onTap: () => _showOptionList<String>(
                controller.globalProjects.toList(),
                (p) => p,
                (val) => controller.selectedProject.value = val,
              ),
            ),
            MySpacing.height(16),
            _buildDropdown<ExpenseTypeModel>(
              icon: Icons.category_outlined,
              title: "Expense Type",
              requiredField: true,
              value: controller.selectedExpenseType.value?.name ??
                  "Select Expense Type",
              onTap: () => _showOptionList<ExpenseTypeModel>(
                controller.expenseTypes.toList(),
                (e) => e.name,
                (val) => controller.selectedExpenseType.value = val,
              ),
            ),
            if (controller.selectedExpenseType.value?.noOfPersonsRequired ==
                true)
              Padding(
                padding: const EdgeInsets.only(top: 16),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: [
                    _SectionTitle(
                      icon: Icons.people_outline,
                      title: "No. of Persons",
                      requiredField: true,
                    ),
                    MySpacing.height(6),
                    _CustomTextField(
                      controller: controller.noOfPersonsController,
                      hint: "Enter No. of Persons",
                      keyboardType: TextInputType.number,
                    ),
                  ],
                ),
              ),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.confirmation_number_outlined, title: "GST No."),
            MySpacing.height(6),
            _CustomTextField(
                controller: controller.gstController, hint: "Enter GST No."),
            MySpacing.height(16),
            _buildDropdown<PaymentModeModel>(
              icon: Icons.payment,
              title: "Payment Mode",
              requiredField: true,
              value: controller.selectedPaymentMode.value?.name ??
                  "Select Payment Mode",
              onTap: () => _showOptionList<PaymentModeModel>(
                controller.paymentModes.toList(),
                (p) => p.name,
                (val) => controller.selectedPaymentMode.value = val,
              ),
            ),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.person_outline,
                title: "Paid By",
                requiredField: true),
            MySpacing.height(6),
            GestureDetector(
              onTap: _showEmployeeList,
              child: _TileContainer(
                child: Row(
                  mainAxisAlignment: MainAxisAlignment.spaceBetween,
                  children: [
                    Text(
                      controller.selectedPaidBy.value == null
                          ? "Select Paid By"
                          : '${controller.selectedPaidBy.value?.firstName ?? ''} ${controller.selectedPaidBy.value?.lastName ?? ''}',
                      style: const TextStyle(fontSize: 14),
                    ),
                    const Icon(Icons.arrow_drop_down, size: 22),
                  ],
                ),
              ),
            ),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.currency_rupee,
                title: "Amount",
                requiredField: true),
            MySpacing.height(6),
            _CustomTextField(
              controller: controller.amountController,
              hint: "Enter Amount",
              keyboardType: TextInputType.number,
            ),
            MySpacing.height(16),
            _SectionTitle(
              icon: Icons.store_mall_directory_outlined,
              title: "Supplier Name",
              requiredField: true,
            ),
            MySpacing.height(6),
            _CustomTextField(
                controller: controller.supplierController,
                hint: "Enter Supplier Name"),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.confirmation_number_outlined,
                title: "Transaction ID"),
            MySpacing.height(6),
            _CustomTextField(
                controller: controller.transactionIdController,
                hint: "Enter Transaction ID"),
            MySpacing.height(16),
            _SectionTitle(
              icon: Icons.calendar_today,
              title: "Transaction Date",
              requiredField: true,
            ),
            MySpacing.height(6),
            GestureDetector(
              onTap: () => controller.pickTransactionDate(context),
              child: AbsorbPointer(
                child: _CustomTextField(
                  controller: controller.transactionDateController,
                  hint: "Select Transaction Date",
                ),
              ),
            ),
            MySpacing.height(16),
            _SectionTitle(icon: Icons.location_on_outlined, title: "Location"),
            MySpacing.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,
                      ),
              ),
            ),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.attach_file,
                title: "Attachments",
                requiredField: true),
            MySpacing.height(6),
            _AttachmentsSection(
              attachments: controller.attachments,
              existingAttachments: controller.existingAttachments,
              onRemoveNew: controller.removeAttachment,
              onRemoveExisting: (item) {
                final index = controller.existingAttachments.indexOf(item);
                if (index != -1) {
                  controller.existingAttachments[index]['isActive'] = false;
                  controller.existingAttachments.refresh();
                }
              },
              onAdd: controller.pickAttachments,
            ),
            MySpacing.height(16),
            _SectionTitle(
                icon: Icons.description_outlined,
                title: "Description",
                requiredField: true),
            MySpacing.height(6),
            _CustomTextField(
              controller: controller.descriptionController,
              hint: "Enter Description",
              maxLines: 3,
            ),
          ],
        ),
      );
    });
  }

  Widget _buildDropdown<T>({
    required IconData icon,
    required String title,
    required bool requiredField,
    required String value,
    required VoidCallback onTap,
  }) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      children: [
        _SectionTitle(icon: icon, title: title, requiredField: requiredField),
        MySpacing.height(6),
        _DropdownTile(title: value, onTap: onTap),
      ],
    );
  }
}

class _SectionTitle extends StatelessWidget {
  final IconData icon;
  final String title;
  final bool requiredField;

  const _SectionTitle({
    required this.icon,
    required this.title,
    this.requiredField = false,
  });

  @override
  Widget build(BuildContext context) {
    final color = Colors.grey[700];
    return Row(
      crossAxisAlignment: CrossAxisAlignment.center,
      children: [
        Icon(icon, color: color, size: 18),
        const SizedBox(width: 8),
        RichText(
          text: TextSpan(
            style: DefaultTextStyle.of(context).style.copyWith(
                  fontWeight: FontWeight.w600,
                  color: Colors.black87,
                ),
            children: [
              TextSpan(text: title),
              if (requiredField)
                const TextSpan(
                  text: ' *',
                  style: TextStyle(color: Colors.red),
                ),
            ],
          ),
        ),
      ],
    );
  }
}

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,
        hintStyle: TextStyle(fontSize: 14, color: Colors.grey[600]),
        filled: true,
        fillColor: Colors.grey.shade100,
        contentPadding:
            const EdgeInsets.symmetric(horizontal: 12, vertical: 14),
        border: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide(color: Colors.grey.shade300),
        ),
        enabledBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide(color: Colors.grey.shade300),
        ),
        focusedBorder: OutlineInputBorder(
          borderRadius: BorderRadius.circular(8),
          borderSide: BorderSide(color: Colors.blueAccent, width: 1.5),
        ),
      ),
    );
  }
}

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),
          ],
        ),
      ),
    );
  }
}

class _TileContainer extends StatelessWidget {
  final Widget child;

  const _TileContainer({required this.child});

  @override
  Widget build(BuildContext context) {
    return 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: child,
    );
  }
}

class _AttachmentsSection extends StatelessWidget {
  final RxList<File> attachments;
  final RxList<Map<String, dynamic>> existingAttachments;
  final ValueChanged<File> onRemoveNew;
  final ValueChanged<Map<String, dynamic>>? onRemoveExisting;
  final VoidCallback onAdd;

  const _AttachmentsSection({
    required this.attachments,
    required this.existingAttachments,
    required this.onRemoveNew,
    this.onRemoveExisting,
    required this.onAdd,
  });

  @override
  Widget build(BuildContext context) {
    return Obx(() {
      final activeExistingAttachments =
          existingAttachments.where((doc) => doc['isActive'] != false).toList();

      return Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          if (activeExistingAttachments.isNotEmpty) ...[
            Text(
              "Existing Attachments",
              style: const TextStyle(fontWeight: FontWeight.w600),
            ),
            const SizedBox(height: 8),
            Wrap(
              spacing: 8,
              runSpacing: 8,
              children: activeExistingAttachments.map((doc) {
                final isImage =
                    doc['contentType']?.toString().startsWith('image/') ??
                        false;
                final url = doc['url'];
                final fileName = doc['fileName'] ?? 'Unnamed';

                return Stack(
                  clipBehavior: Clip.none,
                  children: [
                    GestureDetector(
                      onTap: () async {
                        if (isImage) {
                          final imageDocs = activeExistingAttachments
                              .where((d) => (d['contentType']
                                      ?.toString()
                                      .startsWith('image/') ??
                                  false))
                              .toList();
                          final initialIndex =
                              imageDocs.indexWhere((d) => d == doc);
                          showDialog(
                            context: context,
                            builder: (_) => ImageViewerDialog(
                              imageSources:
                                  imageDocs.map((e) => e['url']).toList(),
                              initialIndex: initialIndex,
                            ),
                          );
                        } else {
                          if (url != null && await canLaunchUrlString(url)) {
                            await launchUrlString(
                              url,
                              mode: LaunchMode.externalApplication,
                            );
                          } else {
                            showAppSnackbar(
                              title: 'Error',
                              message: 'Could not open the document.',
                              type: SnackbarType.error,
                            );
                          }
                        }
                      },
                      child: Container(
                        padding: const EdgeInsets.symmetric(
                            horizontal: 12, vertical: 8),
                        decoration: BoxDecoration(
                          border: Border.all(color: Colors.grey.shade300),
                          borderRadius: BorderRadius.circular(6),
                          color: Colors.grey.shade100,
                        ),
                        child: Row(
                          mainAxisSize: MainAxisSize.min,
                          children: [
                            Icon(
                              isImage ? Icons.image : Icons.insert_drive_file,
                              size: 20,
                              color: Colors.grey[600],
                            ),
                            const SizedBox(width: 7),
                            ConstrainedBox(
                              constraints: const BoxConstraints(maxWidth: 120),
                              child: Text(
                                fileName,
                                overflow: TextOverflow.ellipsis,
                                style: const TextStyle(fontSize: 12),
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                    if (onRemoveExisting != null)
                      Positioned(
                        top: -6,
                        right: -6,
                        child: IconButton(
                          icon: const Icon(Icons.close,
                              color: Colors.red, size: 18),
                          onPressed: () {
                            onRemoveExisting?.call(doc);
                          },
                        ),
                      ),
                  ],
                );
              }).toList(),
            ),
            const SizedBox(height: 16),
          ],

          // New attachments section
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: [
              ...attachments.map((file) => _AttachmentTile(
                    file: file,
                    onRemove: () => onRemoveNew(file),
                  )),
              GestureDetector(
                onTap: onAdd,
                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),
                ),
              ),
            ],
          ),
        ],
      );
    });
  }
}

class _AttachmentTile extends StatelessWidget {
  final File file;
  final VoidCallback onRemove;

  const _AttachmentTile({required this.file, required this.onRemove});

  @override
  Widget build(BuildContext context) {
    final fileName = file.path.split('/').last;
    final extension = fileName.split('.').last.toLowerCase();
    final isImage = ['jpg', 'jpeg', 'png'].contains(extension);

    IconData fileIcon = Icons.insert_drive_file;
    Color iconColor = Colors.blueGrey;

    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;
    }

    return Stack(
      clipBehavior: Clip.none,
      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: onRemove,
          ),
        ),
      ],
    );
  }
}