import 'dart:io';

import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'package:mohem_flutter_app/api/profile_api_client.dart';
import 'package:mohem_flutter_app/app_state/app_state.dart';
import 'package:mohem_flutter_app/classes/utils.dart';
import 'package:mohem_flutter_app/config/routes.dart';
import 'package:mohem_flutter_app/extensions/string_extensions.dart';
import 'package:mohem_flutter_app/generated/locale_keys.g.dart';
import 'package:mohem_flutter_app/models/get_employee_contacts.model.dart';
import 'package:mohem_flutter_app/ui/profile/mazaya_access_result_screen.dart';
import 'package:mohem_flutter_app/widgets/bottom_sheets/confirm_bottom_sheet.dart';
import 'package:mohem_flutter_app/widgets/button/default_button.dart';
import 'package:path_provider/path_provider.dart';
import 'package:share_plus/share_plus.dart';

class _ShieldIconPainter extends CustomPainter {
  final Color color;
  final bool isGranted;

  _ShieldIconPainter({required this.color, required this.isGranted});

  @override
  void paint(Canvas canvas, Size size) {
    Paint paint =
        Paint()
          ..color = color
          ..style = PaintingStyle.stroke
          ..strokeWidth = 2.0
          ..strokeCap = StrokeCap.round
          ..strokeJoin = StrokeJoin.round;

    double w = size.width;
    double h = size.height;

    Path path = Path();
    path.moveTo(w * 0.5, h * 0.1);
    path.cubicTo(w * 0.72, h * 0.1, w * 0.88, h * 0.18, w * 0.88, h * 0.38);
    path.cubicTo(w * 0.88, h * 0.65, w * 0.68, h * 0.84, w * 0.5, h * 0.92);
    path.cubicTo(w * 0.32, h * 0.84, w * 0.12, h * 0.65, w * 0.12, h * 0.38);
    path.cubicTo(w * 0.12, h * 0.18, w * 0.28, h * 0.1, w * 0.5, h * 0.1);
    path.close();

    canvas.drawPath(path, paint);

    if (isGranted) {
      Path checkPath = Path();
      checkPath.moveTo(w * 0.34, h * 0.49);
      checkPath.lineTo(w * 0.46, h * 0.61);
      checkPath.lineTo(w * 0.66, h * 0.39);
      canvas.drawPath(checkPath, paint);
    } else {
      canvas.drawLine(Offset(w * 0.38, h * 0.38), Offset(w * 0.62, h * 0.62), paint);
      canvas.drawLine(Offset(w * 0.62, h * 0.38), Offset(w * 0.38, h * 0.62), paint);
    }
  }

  @override
  bool shouldRepaint(covariant _ShieldIconPainter oldDelegate) => color != oldDelegate.color || isGranted != oldDelegate.isGranted;
}

class DependentDetailsScreen extends StatefulWidget {
  final GetEmployeeContactsList? contact;

  // Null = just viewing (arrived by tapping the card, no top badge). True/false = this screen
  // is being opened right after a successful grant/revoke performed elsewhere (e.g. the
  // dependents list's inline "Allow/Revoke Mazaya Access" link), so the matching badge shows
  // on first build. Toggling from within this screen itself (_performToggleAccess) sets the
  // equivalent local state directly instead of needing this.
  final bool? recentAction;

  const DependentDetailsScreen({Key? key, this.contact, this.recentAction}) : super(key: key);

  @override
  _DependentDetailsScreenState createState() => _DependentDetailsScreenState();
}

class _DependentDetailsScreenState extends State<DependentDetailsScreen> {
  GetEmployeeContactsList? _contact;
  bool _argsLoaded = false;

  // null = just viewing (arrived by tapping the card, no badge) - true = just granted here,
  // false = just revoked here. Set once per toggle in _performToggleAccess; a tap-only visit
  // never sets it, so the top badge only ever reflects an action just taken on this screen.
  bool? _recentAction;

  @override
  void didChangeDependencies() {
    super.didChangeDependencies();
    if (!_argsLoaded) {
      if (widget.contact != null) {
        _contact = widget.contact;
      } else {
        Object? args = ModalRoute.of(context)?.settings.arguments;
        if (args is GetEmployeeContactsList) {
          _contact = args;
        } else if (args is Map && args['contact'] is GetEmployeeContactsList) {
          _contact = args['contact'] as GetEmployeeContactsList;
        }
      }
      _recentAction = widget.recentAction;
      _argsLoaded = true;
    }
  }

  bool get _isAccessAllowed {
    if (_contact == null) return false;
    String? flag = _contact!.mAZAYAACCESSFLG ?? _contact!.mazayaAccess?.toString();
    return flag?.trim().toUpperCase() == 'Y';
  }

  bool get _isNhicVerified {
    if (_contact == null) return false;
    return _contact!.pNHICVERIFIEDFLAG?.trim().toUpperCase() == 'Y';
  }

  String _getInitials(String? name) {
    if (name == null || name.trim().isEmpty) return "D";
    List<String> parts = name.trim().split(RegExp(r'\s+')).where((String p) => p.isNotEmpty).toList();
    if (parts.isEmpty) return "D";
    if (parts.length == 1) {
      return parts.first.length >= 2 ? parts.first.substring(0, 2).toUpperCase() : parts.first.toUpperCase();
    }
    return "${parts.first[0]}${parts.last[0]}".toUpperCase();
  }

  String _getFirstName(String? name) {
    if (name == null || name.trim().isEmpty) return "";
    List<String> parts = name.trim().split(RegExp(r'\s+')).where((String p) => p.isNotEmpty).toList();
    if (parts.isEmpty) return "";
    return parts.first;
  }

  DateTime? _parseBirthDate(String? dateStr) {
    if (dateStr == null || dateStr.trim().isEmpty) return null;
    String s = dateStr.trim();

    RegExp dateRegex = RegExp(r'/?Date\((-?\d+)(?:[+-]\d+)?\)/?');
    Match? match = dateRegex.firstMatch(s);
    if (match != null) {
      try {
        int millis = int.parse(match.group(1)!);
        DateTime dtUtc = DateTime.fromMillisecondsSinceEpoch(millis, isUtc: true);
        return DateTime(dtUtc.year, dtUtc.month, dtUtc.day);
      } catch (_) {}
    }

    if (RegExp(r'^-?\d{10,14}$').hasMatch(s)) {
      try {
        int millis = int.parse(s);
        DateTime dtUtc = DateTime.fromMillisecondsSinceEpoch(millis, isUtc: true);
        return DateTime(dtUtc.year, dtUtc.month, dtUtc.day);
      } catch (_) {}
    }

    DateTime? dt = DateTime.tryParse(s);
    if (dt != null) return DateTime(dt.year, dt.month, dt.day);

    List<String> formats = <String>['yyyy-MM-dd', 'dd/MM/yyyy', 'MM/dd/yyyy', 'dd-MM-yyyy', 'yyyy/MM/dd', 'dd-MMM-yyyy', 'dd MMM yyyy'];
    for (String fmt in formats) {
      try {
        DateTime parsed = DateFormat(fmt, 'en_US').parseStrict(s);
        return DateTime(parsed.year, parsed.month, parsed.day);
      } catch (_) {}
    }

    return null;
  }

  String _formatDob(DateTime? dob, String? raw) {
    if (dob != null) {
      return DateFormat('dd MMM yyyy', 'en_US').format(dob);
    }
    if (raw != null && raw.trim().isNotEmpty) {
      return raw.split(' ').first;
    }
    return "-";
  }

  String _formatNationalId(String? nationalId) {
    if (nationalId == null || nationalId.trim().isEmpty) return "-";
    String clean = nationalId.replaceAll('-', '').trim();
    String last4 = clean.length >= 4 ? clean.substring(clean.length - 4) : clean;
    return LocaleKeys.idEnding.tr(args: <String>[last4]);
  }

  void _onToggleAccess() {
    if (_contact == null) return;
    bool isAllowed = _isAccessAllowed;
    String dependentName = _contact!.cONTACTNAME ?? "";

    ConfirmBottomSheet.show(
      context,
      title: isAllowed ? LocaleKeys.revokeMazayaAccess.tr() : LocaleKeys.allowMazayaAccess.tr(),
      message: isAllowed ? LocaleKeys.confirmRevokeMazayaAccess.tr(args: <String>[dependentName]) : LocaleKeys.confirmGrantMazayaAccess.tr(args: <String>[dependentName]),
      icon: isAllowed ? Icons.remove_circle_outline : Icons.check_circle_outline,
      iconColor: isAllowed ? const Color(0xFFDC2626) : const Color(0xFF168A89),
      confirmText: LocaleKeys.yes.tr(),
      cancelText: LocaleKeys.no.tr(),
      onConfirm: _performToggleAccess,
    );
  }

  Future<void> _performToggleAccess() async {
    if (_contact == null) return;
    bool isAllowed = _isAccessAllowed;
    String action = isAllowed ? "Revoke" : "Grant";

    try {
      Utils.showLoading(context);
      await ProfileApiClient().processContactMazayaAccess(
        accessAction: action,
        contactRelationshipId: _contact!.cONTACTRELATIONSHIPID,
        contactPersonId: _contact!.cONTACTPERSONID,
        personId: _contact!.pERSONID,
        patientIdentificationId: _contact!.nATIONALIDENTIFIER,
        // DATE_OF_BIRTH, not the separate P_BIRTH_DATE response field - that one stays null
        // for every contact until NHIC verification happens, so it's never a usable source here.
        patientBirthDate: _contact!.dATEOFBIRTH,
        nhicVerifiedFlag: _contact!.pNHICVERIFIEDFLAG,
      );

      setState(() {
        _contact!.mAZAYAACCESSFLG = action == "Grant" ? "Y" : "N";
        _contact!.mazayaAccess = _contact!.mAZAYAACCESSFLG;
        // Top badge reflects whichever action was just taken on this screen, not just "was
        // granted at some point" - a later revoke flips it so a stale grant badge never lingers.
        _recentAction = action == "Grant";
      });

      Utils.hideLoading(context);

      // Stay on this same screen either way - it already reflects the new access state via
      // setState above (status badge, top banner, action button, and the share-link section
      // all update in place), so tapping a dependent card and successfully toggling access
      // both land on the exact same screen instead of a separate "success" screen. The top
      // badge itself is the confirmation now, so no toast on top of it.
    } catch (ex) {
      Utils.hideLoading(context);
      Utils.handleException(ex, context, null);
    }
  }

  // Full (unmasked) DOB for the share message - distinct from _formatDob/_formatNationalId
  // above, which are for the masked on-screen Key Details display.
  String _formatDobForShare() {
    DateTime? dob = _parseBirthDate(_contact?.dATEOFBIRTH);
    if (dob != null) return DateFormat('dd-MM-yyyy').format(dob);
    String raw = _contact?.dATEOFBIRTH?.trim() ?? "";
    if (raw.isEmpty) return "";
    if (raw.contains('T')) return raw.split('T').first;
    if (raw.contains(' ')) return raw.split(' ').first;
    return raw;
  }

  // Same message built for both "Share Download Link" and "Copy Link" - they must always
  // carry identical content, so this is the single source of truth for it.
  String _buildMazayaInviteMessage(String linkToShare) {
    String? nationalId = _contact?.nATIONALIDENTIFIER?.trim();
    String nationalIdLine = (nationalId == null || nationalId.isEmpty) ? LocaleKeys.nationalIdOrIqamaFallback.tr() : "${LocaleKeys.nationalId.tr()}: $nationalId";
    return "$linkToShare\n\n${LocaleKeys.mazayaInviteInstructions.tr()}\n\n$nationalIdLine\n${LocaleKeys.dateOfBirth.tr()}: ${_formatDobForShare()}";
  }

  // Shares the invite text together with the language-appropriate steps PDF from assets.
  // Falls back to sharing just the text if the PDF can't be loaded/copied for any reason.
  Future<void> _shareMazayaInvite(bool isAr, String linkToShare) async {
    String message = _buildMazayaInviteMessage(linkToShare);

    try {
      ByteData bytes = await rootBundle.load(MazayaAccessResultScreen.getShareGuidePdfAssetPath(isAr));
      Directory tempDir = await getTemporaryDirectory();
      String localFileName = isAr ? "mazaya_access_guide_ar.pdf" : "mazaya_access_guide_en.pdf";
      File pdfFile = File('${tempDir.path}/$localFileName');
      await pdfFile.writeAsBytes(bytes.buffer.asUint8List(bytes.offsetInBytes, bytes.lengthInBytes));

      await SharePlus.instance.share(ShareParams(text: message, files: [XFile(pdfFile.path)]));
    } catch (_) {
      try {
        await SharePlus.instance.share(ShareParams(text: message));
      } catch (_) {}
    }
  }

  @override
  Widget build(BuildContext context) {
    DateTime? dob = _parseBirthDate(_contact?.dATEOFBIRTH);
    String initials = _getInitials(_contact?.cONTACTNAME);
    String fullName = _contact?.cONTACTNAME ?? "";
    String firstName = _getFirstName(_contact?.cONTACTNAME);
    String relation = (_contact?.rELATIONSHIP != null && _contact!.rELATIONSHIP!.trim().isNotEmpty) ? _contact!.rELATIONSHIP!.trim() : (_contact?.cONTACTTYPE?.trim() ?? "");
    String formattedId = _formatNationalId(_contact?.nATIONALIDENTIFIER);
    String formattedDob = _formatDob(dob, _contact?.dATEOFBIRTH);
    bool isAllowed = _isAccessAllowed;
    bool isAr = AppState().isArabic(context);
    String linkToShare = MazayaAccessResultScreen.getDownloadLink();

    return Scaffold(
      backgroundColor: const Color(0xFFF8FAFC),
      appBar: PreferredSize(
        preferredSize: const Size.fromHeight(56),
        child: SafeArea(
          child: Container(
            height: 56,
            color: const Color(0xFFF8FAFC),
            padding: const EdgeInsets.symmetric(horizontal: 16),
            child: Row(
              children: <Widget>[
                InkWell(
                  borderRadius: BorderRadius.circular(20),
                  onTap: () => Navigator.pop(context),
                  child: const Padding(padding: EdgeInsets.all(8.0), child: Icon(Icons.arrow_back_ios_new_rounded, size: 20, color: Color(0xFF1E293B))),
                ),
                const SizedBox(width: 8),
                LocaleKeys.dependentDetails.tr().toText20(color: const Color(0xFF1E293B)),
                const Spacer(),
                InkWell(
                  borderRadius: BorderRadius.circular(20),
                  onTap: () => Navigator.popUntil(context, ModalRoute.withName(AppRoutes.dashboard)),
                  child: const Padding(padding: EdgeInsets.all(8.0), child: Icon(Icons.home_outlined, size: 24, color: Color(0xFF1E293B))),
                ),
              ],
            ),
          ),
        ),
      ),
      body: SafeArea(
        child: Column(
          children: <Widget>[
            Expanded(
              child: SingleChildScrollView(
                padding: const EdgeInsets.fromLTRB(20, 12, 20, 30),
                child: Column(
                  crossAxisAlignment: CrossAxisAlignment.start,
                  children: <Widget>[
                    // Shown only right after a grant/revoke action taken on this screen - not
                    // when just viewing a dependent by tapping into this screen (_recentAction
                    // is null in that case).
                    if (_recentAction != null) ...<Widget>[
                      Center(
                        child: Container(
                          width: 72,
                          height: 72,
                          decoration: BoxDecoration(color: _recentAction! ? const Color(0xFFE6F7F2) : const Color(0xFFFEECEB), shape: BoxShape.circle),
                          child: Center(
                            child: CustomPaint(
                              size: const Size(36, 36),
                              painter: _ShieldIconPainter(color: _recentAction! ? const Color(0xFF168A89) : const Color(0xFFED1C24), isGranted: _recentAction!),
                            ),
                          ),
                        ),
                      ),
                      const SizedBox(height: 10),
                      Center(
                        child: (_recentAction! ? LocaleKeys.mazayaAccessGranted.tr() : LocaleKeys.mazayaAccessRevoked.tr()).toText16(
                          weight: FontWeight.w500,
                          color: _recentAction! ? const Color(0xFF168A89) : const Color(0xFFED1C24),
                        ),
                      ),
                      const SizedBox(height: 16),
                    ],

                    // Profile Card (Mint Green)
                    Container(
                      width: double.infinity,
                      padding: const EdgeInsets.all(16),
                      decoration: BoxDecoration(color: const Color(0xFFE8F7F2), borderRadius: BorderRadius.circular(16), border: Border.all(color: const Color(0xFFBCE6D7), width: 1.2)),
                      child: Row(
                        crossAxisAlignment: CrossAxisAlignment.center,
                        children: <Widget>[
                          // Avatar circle with initials
                          Container(
                            width: 52,
                            height: 52,
                            decoration: const BoxDecoration(color: Colors.white, shape: BoxShape.circle),
                            child: Center(child: initials.toText17(color: const Color(0xFF168A89))),
                          ),
                          const SizedBox(width: 14),

                          // Dependent Name & Relation
                          Expanded(
                            child: Column(
                              crossAxisAlignment: CrossAxisAlignment.start,
                              mainAxisSize: MainAxisSize.min,
                              children: <Widget>[
                                fullName.toText16(maxlines: 2, weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                                if (relation.isNotEmpty) ...<Widget>[const SizedBox(height: 3), relation.toText12(maxLine: 1, weight: FontWeight.w500, color: const Color(0xFF168A89))],
                              ],
                            ),
                          ),

                          // Verified badge on right - only when NHIC has actually verified this contact
                          if (_isNhicVerified) ...<Widget>[const SizedBox(width: 8), const Icon(Icons.verified_outlined, color: Color(0xFF059669), size: 24)],
                        ],
                      ),
                    ),

                    const SizedBox(height: 16),

                    // Key details Card
                    Container(
                      width: double.infinity,
                      padding: const EdgeInsets.all(16),
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(16),
                        border: Border.all(color: const Color(0xFFF1F5F9)),
                        boxShadow: const <BoxShadow>[BoxShadow(color: Color(0x08000000), blurRadius: 8, offset: Offset(0, 2))],
                      ),
                      child: Column(
                        children: <Widget>[
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.keyDetails.tr().toText16(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                              if (_isNhicVerified) LocaleKeys.verified.tr().toText13(weight: FontWeight.w500, color: const Color(0xFF059669)),
                            ],
                          ),
                          const SizedBox(height: 14),
                          const Divider(height: 1, thickness: 1, color: Color(0xFFF1F5F9)),
                          const SizedBox(height: 14),
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.nationalId.tr().toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),
                              formattedId.toText13(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                            ],
                          ),
                          const SizedBox(height: 12),
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.dateOfBirth.tr().toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),
                              formattedDob.toText13(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                            ],
                          ),
                        ],
                      ),
                    ),

                    const SizedBox(height: 24),

                    // Services & actions section header
                    LocaleKeys.servicesAndActions.tr().toText17(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                    const SizedBox(height: 4),
                    LocaleKeys.startDependentFlowsDesc.tr().toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),

                    const SizedBox(height: 12),

                    // Mazaya access Card
                    Container(
                      width: double.infinity,
                      padding: const EdgeInsets.all(16),
                      decoration: BoxDecoration(
                        color: Colors.white,
                        borderRadius: BorderRadius.circular(16),
                        border: Border.all(color: const Color(0xFFF1F5F9)),
                        boxShadow: const <BoxShadow>[BoxShadow(color: Color(0x08000000), blurRadius: 8, offset: Offset(0, 2))],
                      ),
                      child: Column(
                        crossAxisAlignment: CrossAxisAlignment.start,
                        children: <Widget>[
                          // Header Row: Mazaya access + Badge
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.mazayaAccess.tr().toText16(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                              Container(
                                padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 3),
                                decoration: BoxDecoration(color: isAllowed ? const Color(0xFFECFDF5) : const Color(0xFFFEE2E2), borderRadius: BorderRadius.circular(12)),
                                child: (isAllowed ? LocaleKeys.active.tr() : LocaleKeys.accessOff.tr()).toText12(
                                  weight: FontWeight.w500,
                                  color: isAllowed ? const Color(0xFF059669) : const Color(0xFFEF4444),
                                ),
                              ),
                            ],
                          ),
                          const SizedBox(height: 6),
                          LocaleKeys.allowDependentMazayaOffersDesc.tr(args: <String>[firstName.isNotEmpty ? firstName : fullName]).toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),
                          const SizedBox(height: 16),
                          const Divider(height: 1, thickness: 1, color: Color(0xFFF1F5F9)),
                          const SizedBox(height: 14),

                          // Login method row
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.loginMethod.tr().toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),
                              LocaleKeys.nationalIdAndDob.tr().toText13(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                            ],
                          ),
                          const SizedBox(height: 12),

                          // Verification row
                          Row(
                            mainAxisAlignment: MainAxisAlignment.spaceBetween,
                            children: <Widget>[
                              LocaleKeys.verification.tr().toText13(weight: FontWeight.w400, color: const Color(0xFF64748B)),
                              LocaleKeys.sponsorOtp.tr().toText13(weight: FontWeight.w500, color: const Color(0xFF1E293B)),
                            ],
                          ),

                          const SizedBox(height: 20),

                          // Action Button: Allow Mazaya Access (Teal) or Revoke Mazaya Access (Red Outline)
                          InkWell(
                            borderRadius: BorderRadius.circular(12),
                            onTap: _onToggleAccess,
                            child: Container(
                              height: 48,
                              width: double.infinity,
                              decoration: BoxDecoration(
                                color: isAllowed ? const Color(0xFFFEF2F2) : const Color(0xFF22B0A6),
                                borderRadius: BorderRadius.circular(12),
                                border: isAllowed ? Border.all(color: const Color(0xFFFECACA), width: 1.2) : null,
                              ),
                              child: Row(
                                mainAxisAlignment: MainAxisAlignment.center,
                                children: <Widget>[
                                  SizedBox(width: 18, height: 18, child: CustomPaint(painter: _ShieldIconPainter(color: isAllowed ? const Color(0xFFDC2626) : Colors.white, isGranted: !isAllowed))),
                                  const SizedBox(width: 8),
                                  (isAllowed ? LocaleKeys.revokeMazayaAccess.tr() : LocaleKeys.allowMazayaAccess.tr()).toText16(
                                    weight: FontWeight.w500,
                                    color: isAllowed ? const Color(0xFFDC2626) : Colors.white,
                                  ),
                                ],
                              ),
                            ),
                          ),

                          if (isAllowed) ...<Widget>[
                            const SizedBox(height: 12),
                            Center(child: LocaleKeys.revokingPreventsAccessDesc.tr().toText11(weight: FontWeight.w400, color: const Color(0xFF64748B), isCenter: true)),
                          ],
                        ],
                      ),
                    ),
                  ],
                ),
              ),
            ),
            // Share download link - same bottom-sticky button convention used elsewhere in
            // the app (e.g. "Join Marathon"), shown once access is granted.
            if (isAllowed) DefaultButton(LocaleKeys.shareDownloadLink.tr(), () => _shareMazayaInvite(isAr, linkToShare)).insideContainer,
          ],
        ),
      ),
    );
  }
}