import 'package:dotted_line/dotted_line.dart';
import 'package:flutter/material.dart';
import 'package:flutter_svg/svg.dart';
import 'package:provider/provider.dart';
import 'package:url_launcher/url_launcher.dart';

import '../../Notifiers/hrmProvider/leaveApplicationDetailsProvider.dart';
import '../../Notifiers/HomeScreenNotifier.dart';
import '../../Utils/app_colors.dart';
import '../finance/FileViewer.dart';

/// Screen for leave application details
class LeaveApplicationDetailScreen extends StatefulWidget {
  final String leaveRequestId;
  final String mode;
  const LeaveApplicationDetailScreen({super.key, required this.leaveRequestId, required this.mode});

  @override
  State<LeaveApplicationDetailScreen> createState() => _LeaveApplicationDetailScreenState();
}

class _LeaveApplicationDetailScreenState extends State<LeaveApplicationDetailScreen> {
  @override
  Widget build(BuildContext context) {
    return ChangeNotifierProvider(
      create: (_) => LeaveApplicationDetailsProvider()..fetchLeaveApplicationDetails(context, widget.leaveRequestId),
      child: Consumer<LeaveApplicationDetailsProvider>(
        builder: (context, provider, child) {
          return Scaffold(
            appBar: AppBar(
              automaticallyImplyLeading: false,
              backgroundColor: const Color(0xFFFFFFFF),
              title: Row(
                mainAxisAlignment: MainAxisAlignment.start,
                crossAxisAlignment: CrossAxisAlignment.center,
                children: [
                  InkResponse(
                    onTap: () => Navigator.pop(context, true),
                    child: SvgPicture.asset(
                      "assets/svg/appbar_back_button.svg",
                      height: 25,
                    ),
                  ),
                  const SizedBox(width: 10),
                  InkResponse(
                    onTap: () => Navigator.pop(context, true),
                    child: Text(
                      "Leave Application Details",
                      style: TextStyle(
                        fontSize: 18,
                        height: 1.1,
                        fontFamily: "Plus Jakarta Sans",
                        fontWeight: FontWeight.w600,
                        color: AppColors.semi_black,
                      ),
                    ),
                  ),
                ],
              ),
            ),
            backgroundColor: const Color(0xFFF6F6F8),
            body: Builder(
              builder: (context) {
                if (provider.isLoading) {
                  return const Center(child: CircularProgressIndicator(color: Colors.blue));
                }
                if (provider.errorMessage != null) {
                  return Center(child: Text(provider.errorMessage!));
                }
                if (provider.response?.requestDetails == null) {
                  return const Center(child: Text("No details found"));
                }

                final details = provider.response!.requestDetails!;

                /// Screen content
                return SingleChildScrollView(
                  padding: const EdgeInsets.all(16.0),
                  child: Column(
                    children: [
                      Card(
                        shape: RoundedRectangleBorder(
                          borderRadius: BorderRadius.circular(16),
                        ),
                        elevation: 2,
                        child: Padding(
                          padding: const EdgeInsets.all(10.0),
                          child: Column(
                            crossAxisAlignment: CrossAxisAlignment.start,
                            children: [
                              /// Header with status
                              Container(
                                margin: const EdgeInsets.only(bottom: 0.5),
                                padding: const EdgeInsets.symmetric(vertical: 10, horizontal: 2),
                                decoration: BoxDecoration(
                                  color: Colors.white,
                                  borderRadius: BorderRadius.circular(12),
                                ),
                                child: Row(
                                  children: [
                                    /// Left Avatar
                                    Container(
                                      height: 48,
                                      width: 48,
                                      decoration: BoxDecoration(
                                        shape: BoxShape.circle,
                                        color: const Color(0xFFEDF8FF), // icon bg
                                      ),
                                      child: Center(
                                        child: SvgPicture.asset(
                                          height: 28,
                                          width: 28,
                                          "assets/svg/hrm/leaveApplication.svg", // Use appropriate icon
                                          fit: BoxFit.contain,
                                        ),
                                      ),
                                    ),
                                    const SizedBox(width: 12),

                                    /// Middle text
                                    Expanded(
                                      child: Column(
                                        crossAxisAlignment: CrossAxisAlignment.start,
                                        children: [
                                          Text(
                                            details.leaveType ?? "-",
                                            style: TextStyle(
                                              decoration: TextDecoration.underline,
                                              decorationStyle:
                                              TextDecorationStyle.dotted,
                                              decorationColor: AppColors.grey_thick,
                                              height: 1.2,
                                              fontFamily: "JakartaRegular",
                                              fontSize: 14,
                                              color: AppColors.semi_black,
                                            ),
                                          ),
                                          const SizedBox(height: 2),
                                          Text(
                                            "Applied: ${details.appliedDate ?? "-"}",
                                            style: TextStyle(
                                              fontFamily: "JakartaRegular",
                                              fontSize: 14,
                                              color: AppColors.app_blue,
                                            ),
                                          ),
                                        ],
                                      ),
                                    ),

                                    /// Right side status badge
                                    Container(
                                      height: 30,
                                      padding: const EdgeInsets.symmetric(horizontal: 5, vertical: 1),
                                      decoration: BoxDecoration(
                                        borderRadius: BorderRadius.circular(8),
                                        color: _getStatusBackgroundColor(details.status),
                                      ),
                                      child: Center(
                                        child: Text(
                                          details.status ?? "-",
                                          textAlign: TextAlign.center,
                                          style: TextStyle(
                                            fontFamily: "JakartaMedium",
                                            fontSize: 12,
                                            color: _getStatusTextColor(details.status),
                                          ),
                                        ),
                                      ),
                                    ),
                                  ],
                                ),
                              ),

                              /// Leave Details
                              Padding(
                                padding: const EdgeInsets.all(8.0),
                                child: Column(
                                  children: [
                                    _buildSectionHeader("Leave Details"),
                                    _buildDetailTile("Application ID", details.id),
                                    _buildDetailTile("Applied Date", details.appliedDate),
                                    _buildDetailTile("Leave Type", details.leaveType),
                                    _buildDateRangeTile("Leave Period", details.fromDate, details.toDate),
                                    _buildTimeRangeTile("Time Period", details.fromTime, details.toTime),
                                    _buildDetailTile("Reason", details.reason),

                                    /// Approval Details
                                    _buildSectionHeader("Approval Details"),
                                    _buildDetailTile("Requested To", details.requestedTo),
                                    _buildDetailTile("Approved By", details.approvedBy),
                                    _buildDetailTile("Approved Date", details.approvedDate),
                                    _buildDetailTile("Approval Remarks", details.approvalRemarks),

                                    /// Additional Information
                                    _buildSectionHeader("Additional Information"),
                                    _buildDetailTile("Status", details.status),
                                    _buildDetailTile("From Time", details.fromTime),
                                    _buildDetailTile("To Time", details.toTime),
                                  ],
                                ),
                              ),
                            ],
                          ),
                        ),
                      ),
                      const SizedBox(height: 30),
                    ],
                  ),
                );
              },
            ),
            bottomNavigationBar: widget.mode == "teamleader"
                ? Container(
              decoration: const BoxDecoration(color: Colors.white),
              padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 10),
              height: 80,
              child: Row(
                children: [
                  /// Reject Button
                  Expanded(
                    child: InkWell(
                      onTap: () {
                        showRemarkSheet(
                          context: context,
                          actionType: "Reject",
                          onSubmit: (remark) {
                            provider.leaveRequestRejectApprove(
                              context,
                              mode: widget.mode,
                              type: "Rejected",
                              remarks: remark,
                              id: provider.response!.requestDetails!.id!,
                            );
                          },
                        );
                      },
                      child: Container(
                        alignment: Alignment.center,
                        height: 45,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(8),
                          color: const Color(0xFFFFFFFF),
                          border: Border.all(
                            color: const Color(0xFFE0E0E0),
                            width: 0.5,
                          ),
                        ),
                        child: Row(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            SvgPicture.asset("assets/svg/finance/level_reject_ic.svg"),
                            const SizedBox(width: 6),
                            const Text(
                              "Reject",
                              style: TextStyle(
                                color: Colors.black87,
                                fontSize: 14,
                                fontFamily: "JakartaMedium",
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                  const SizedBox(width: 10),

                  /// Approve Button
                  Expanded(
                    child: InkWell(
                      onTap: () {
                        showRemarkSheet(
                          context: context,
                          actionType: "Approve",
                          onSubmit: (remark) {
                            provider.leaveRequestRejectApprove(
                              context,
                              mode: widget.mode,
                              type: "Approved",
                              remarks: remark,
                              id: provider.response!.requestDetails!.id!,
                            );
                          },
                        );
                      },
                      child: Container(
                        alignment: Alignment.center,
                        height: 45,
                        decoration: BoxDecoration(
                          borderRadius: BorderRadius.circular(8),
                          color: const Color(0xFFFFFFFF),
                          border: Border.all(
                            color: const Color(0xFFE0E0E0),
                            width: 0.5,
                          ),
                        ),
                        child: Row(
                          mainAxisAlignment: MainAxisAlignment.center,
                          children: [
                            SvgPicture.asset("assets/svg/finance/level_approve_ic.svg"),
                            const SizedBox(width: 6),
                            const Text(
                              "Approve",
                              style: TextStyle(
                                color: Colors.black87,
                                fontSize: 14,
                                fontFamily: "JakartaMedium",
                              ),
                            ),
                          ],
                        ),
                      ),
                    ),
                  ),
                ],
              ),
            )
                : const SizedBox.shrink(),
            floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
          );
        },
      ),
    );
  }

  Future<void> showRemarkSheet({
    required BuildContext context,
    required String actionType, // "Approved" or "Rejected"
    required Function(String remark) onSubmit,
  }) {
    final remarkController = TextEditingController();
    String? remarkError;

    return showModalBottomSheet(
      useSafeArea: true,
      isDismissible: true,
      isScrollControlled: true,
      showDragHandle: true,
      backgroundColor: Colors.white,
      enableDrag: true,
      context: context,
      builder: (context) {
        return StatefulBuilder(
          builder: (context, setState) {
            void updateState(VoidCallback fn) {
              setState(fn);
            }

            bool validateFields() {
              String? newRemarkError =
              remarkController.text.trim().isEmpty ? "Remark required" : null;

              if (remarkError != newRemarkError) {
                updateState(() {
                  remarkError = newRemarkError;
                });
              }
              return newRemarkError == null;
            }

            Widget errorText(String? msg) => msg == null
                ? const SizedBox()
                : Padding(
              padding: const EdgeInsets.only(top: 4, left: 4),
              child: Text(
                msg,
                style: const TextStyle(
                  color: Colors.red,
                  fontSize: 12,
                  fontFamily: "JakartaMedium",
                ),
              ),
            );

            return SafeArea(
              child: Container(
                margin: const EdgeInsets.symmetric(horizontal: 15, vertical: 10),
                padding: EdgeInsets.only(
                  bottom: MediaQuery.of(context).viewInsets.bottom,
                ),
                child: SingleChildScrollView(
                  child: Column(
                    crossAxisAlignment: CrossAxisAlignment.start,
                    mainAxisSize: MainAxisSize.min,
                    children: [
                      Text(
                        "$actionType Attendance Request",
                        style: const TextStyle(
                          fontSize: 16,
                          color: Colors.black87,
                          fontFamily: "JakartaMedium",
                        ),
                      ),
                      const SizedBox(height: 16),

                      Text(
                        "Remark",
                        style: const TextStyle(
                          fontSize: 14,
                          color: Colors.black87,
                          fontFamily: "JakartaMedium",
                        ),
                      ),
                      const SizedBox(height: 6),

                      TextField(
                        controller: remarkController,
                        maxLines: 3,
                        onChanged: (val) {
                          if (remarkError != null && val.isNotEmpty) {
                            updateState(() => remarkError = null);
                          }
                        },
                        decoration: InputDecoration(
                          hintText: "Enter your remark here...",
                          filled: true,
                          fillColor: Colors.grey.shade100,
                          border: OutlineInputBorder(
                            borderRadius: BorderRadius.circular(12),
                          ),
                          contentPadding: const EdgeInsets.symmetric(
                            vertical: 12,
                            horizontal: 12,
                          ),
                        ),
                      ),
                      errorText(remarkError),

                      const SizedBox(height: 20),

                      Row(
                        children: [
                          Expanded(
                            child: InkResponse(
                              onTap: () => Navigator.pop(context),
                              child: Container(
                                height: 45,
                                decoration: BoxDecoration(
                                  color: Colors.red.shade100,
                                  borderRadius: BorderRadius.circular(12),
                                ),
                                child: const Center(
                                  child: Text(
                                    "Cancel",
                                    style: TextStyle(
                                      color: Colors.red,
                                      fontFamily: "JakartaMedium",
                                    ),
                                  ),
                                ),
                              ),
                            ),
                          ),
                          const SizedBox(width: 12),
                          Expanded(
                            child: InkResponse(
                              onTap: () async {
                                if (validateFields()) {
                                  final remark = remarkController.text.trim();
                                  // Call provider
                                  await onSubmit(remark);
                                  //  SnackBar here
                                  Navigator.pop(context);
                                  ScaffoldMessenger.of(context).showSnackBar(
                                    SnackBar(
                                      content: Text("Request submitted successfully"),
                                      backgroundColor: Colors.green,
                                      behavior: SnackBarBehavior.floating,
                                    ),
                                  );
                                }
                              },

                              child: Container(
                                height: 45,
                                decoration: BoxDecoration(
                                  color: Colors.blue,
                                  borderRadius: BorderRadius.circular(12),
                                ),
                                child: const Center(
                                  child: Text(
                                    "Submit",
                                    style: TextStyle(
                                      color: Colors.white,
                                      fontFamily: "JakartaMedium",
                                    ),
                                  ),
                                ),
                              ),
                            ),

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


  /// Reusable Row Widget for details
  Widget _buildDetailTile(String label, String? value) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 3),
      child: Row(
        children: [
          Expanded(
            flex: 6,
            child: Text(
              label,
              style: TextStyle(
                fontFamily: "JakartaRegular",
                fontSize: 14,
                color: AppColors.semi_black,
              ),
            ),
          ),
          Expanded(
            flex: 0,
            child: Text(
              value ?? "-",
              style: const TextStyle(
                fontSize: 14,
                color: Color(0xff818181),
                fontWeight: FontWeight.w400,
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// For date range display
  Widget _buildDateRangeTile(String label, String? fromDate, String? toDate) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 3),
      child: Row(
        children: [
          Expanded(
            flex: 6,
            child: Text(
              label,
              style: TextStyle(
                fontFamily: "JakartaRegular",
                fontSize: 14,
                color: AppColors.semi_black,
              ),
            ),
          ),
          Expanded(
            flex: 0,
            child: Text(
              '${fromDate ?? "-"} to ${toDate ?? "-"}',
              style: const TextStyle(
                fontSize: 14,
                color: Color(0xff818181),
                fontWeight: FontWeight.w400,
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// For time range display
  Widget _buildTimeRangeTile(String label, String? fromTime, String? toTime) {
    if ((fromTime == null || fromTime.isEmpty) && (toTime == null || toTime.isEmpty)) {
      return const SizedBox.shrink(); // Hide if no time data
    }

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 3),
      child: Row(
        children: [
          Expanded(
            flex: 6,
            child: Text(
              label,
              style: const TextStyle(
                fontSize: 14,
                color: Color(0xff2D2D2D),
                fontStyle: FontStyle.normal,
                fontFamily: "Plus Jakarta Sans",
                fontWeight: FontWeight.w400,
              ),
            ),
          ),
          Expanded(
            flex: 0,
            child: Text(
              '${fromTime ?? "-"} to ${toTime ?? "-"}',
              style: const TextStyle(
                fontSize: 14,
                color: Color(0xff818181),
                fontWeight: FontWeight.w400,
              ),
            ),
          ),
        ],
      ),
    );
  }

  /// Section header with dotted line
  Widget _buildSectionHeader(String title) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 8),
      child: Row(
        children: [
          Text(
            title,
            style: TextStyle(
              fontSize: 14,
              fontFamily: "JakartaSemiBold",
            ),
          ),
          const SizedBox(width: 10),
          Expanded(
            child: DottedLine(
              dashGapLength: 4,
              dashGapColor: Colors.white,
              dashColor: AppColors.grey_semi,
              dashLength: 2,
              lineThickness: 0.5,
            ),
          ),
        ],
      ),
    );
  }

  /// Status background color
  Color _getStatusBackgroundColor(String? status) {
    switch (status?.toLowerCase()) {
      case 'approved':
        return AppColors.approved_bg_color;
      case 'rejected':
        return AppColors.rejected_bg_color;
      case 'requested':
      default:
        return AppColors.requested_bg_color;
    }
  }

  /// Status text color
  Color _getStatusTextColor(String? status) {
    switch (status?.toLowerCase()) {
      case 'approved':
        return AppColors.approved_text_color;
      case 'rejected':
        return AppColors.rejected_text_color;
      case 'requested':
      default:
        return AppColors.requested_text_color;
    }
  }
}