import 'package:flutter/material.dart';
import 'package:flutter_riverpod/flutter_riverpod.dart';

import '../../../core/providers/auth_provider.dart';
import '../../../core/services/realtime_service.dart';
import '../../../core/theme/app_theme.dart';
import '../../../models/job.dart';
import '../../../models/job_file.dart';
import '../../../features/shared/job_files_repository.dart';
import '../../../features/shared/job_files_panel.dart';
import '../../../core/services/job_history_service.dart';
import 'clinic_jobs_repository.dart';

class ClinicJobDetailScreen extends ConsumerStatefulWidget {
  const ClinicJobDetailScreen({super.key, required this.jobId});
  final String jobId;

  @override
  ConsumerState<ClinicJobDetailScreen> createState() =>
      _ClinicJobDetailScreenState();
}

class _ClinicJobDetailScreenState
    extends ConsumerState<ClinicJobDetailScreen> {
  Job? _job;
  String? _loadError;
  late Future<List<JobFile>> _filesFuture;
  bool _isActing = false;
  late UnsubFn _unsub;

  @override
  void initState() {
    super.initState();
    _load();
    _loadFiles();
    _unsub = RealtimeService.instance.watch(
      'jobs',
      topic: widget.jobId,
      onEvent: (_) { if (mounted && !_isActing) _load(); },
    );
  }

  @override
  void dispose() {
    _unsub();
    super.dispose();
  }

  Future<void> _load() async {
    if (mounted) setState(() { _loadError = null; });
    try {
      final job = await ClinicJobsRepository.instance.getJob(widget.jobId);
      if (mounted) setState(() { _job = job; });
    } catch (e) {
      if (mounted) setState(() { _loadError = e.toString(); });
    }
  }

  void _loadFiles() {
    setState(() {
      _filesFuture = JobFilesRepository.instance.listForJob(widget.jobId);
    });
  }

  Future<void> _approve(Job job) async {
    setState(() => _isActing = true);
    try {
      final updated = await ClinicJobsRepository.instance.approveAtClinic(job.id, job);
      if (mounted) {
        setState(() { _job = updated.copyWith(clinicName: job.clinicName, labName: job.labName); _isActing = false; });
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('İş onaylandı.')),
        );
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isActing = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Hata: $e')),
        );
      }
    }
  }

  Future<void> _cancelJob(Job job) async {
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('İşi İptal Et'),
        content: const Text('Bu iş geri alınamaz şekilde iptal edilir. Onaylıyor musunuz?'),
        actions: [
          TextButton(onPressed: () => Navigator.pop(ctx, false), child: const Text('Vazgeç')),
          FilledButton(
            style: FilledButton.styleFrom(backgroundColor: AppColors.cancelled),
            onPressed: () => Navigator.pop(ctx, true),
            child: const Text('İptal Et'),
          ),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;
    setState(() => _isActing = true);
    try {
      final updated = await ClinicJobsRepository.instance.cancelJob(job.id, job);
      if (mounted) {
        setState(() { _job = _job!.copyWith(status: updated.status); _isActing = false; });
        ScaffoldMessenger.of(context).showSnackBar(const SnackBar(content: Text('İş iptal edildi.')));
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isActing = false);
        ScaffoldMessenger.of(context).showSnackBar(SnackBar(content: Text('Hata: $e')));
      }
    }
  }

  Future<void> _requestRevision(Job job) async {
    final noteController = TextEditingController();
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Revizyon Talebi'),
        content: TextField(
          controller: noteController,
          decoration: const InputDecoration(
            labelText: 'Açıklama',
            hintText: 'Revizyon sebebini belirtin...',
          ),
          minLines: 3,
          maxLines: 5,
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, false),
            child: const Text('İptal'),
          ),
          FilledButton(
            onPressed: () => Navigator.pop(ctx, true),
            child: const Text('Gönder'),
          ),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;
    if (noteController.text.trim().isEmpty) {
      ScaffoldMessenger.of(context).showSnackBar(
        const SnackBar(content: Text('Lütfen bir açıklama girin.')),
      );
      return;
    }

    setState(() => _isActing = true);
    try {
      final updated = await ClinicJobsRepository.instance.requestRevision(
        job.id,
        job,
        note: noteController.text.trim(),
      );
      if (mounted) {
        setState(() { _job = updated.copyWith(clinicName: job.clinicName, labName: job.labName); _isActing = false; });
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('Revizyon talebi gönderildi.')),
        );
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isActing = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Hata: $e')),
        );
      }
    }
  }

  Future<void> _markDelivered(Job job) async {
    final noteCtrl = TextEditingController();
    final confirmed = await showDialog<bool>(
      context: context,
      builder: (ctx) => AlertDialog(
        title: const Text('Teslim Alındı'),
        content: Column(
          mainAxisSize: MainAxisSize.min,
          crossAxisAlignment: CrossAxisAlignment.start,
          children: [
            const Text('Bu işi teslim aldığınızı onaylıyor musunuz?'),
            const SizedBox(height: 12),
            TextField(
              controller: noteCtrl,
              decoration: const InputDecoration(
                labelText: 'Teslimat notu (isteğe bağlı)',
                hintText: 'Teslim eden kişi, durum vb...',
                isDense: true,
              ),
              maxLines: 2,
            ),
          ],
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(ctx, false),
            child: const Text('İptal'),
          ),
          FilledButton(
            style: FilledButton.styleFrom(backgroundColor: AppColors.success),
            onPressed: () => Navigator.pop(ctx, true),
            child: const Text('Teslim Alındı'),
          ),
        ],
      ),
    );
    if (confirmed != true || !mounted) return;

    setState(() => _isActing = true);
    try {
      final note = noteCtrl.text.trim().isNotEmpty ? noteCtrl.text.trim() : null;
      final updated = await ClinicJobsRepository.instance.markDelivered(job.id, job, note: note);
      if (mounted) {
        setState(() { _job = updated.copyWith(clinicName: job.clinicName, labName: job.labName); _isActing = false; });
        ScaffoldMessenger.of(context).showSnackBar(
          const SnackBar(content: Text('İş teslim alındı olarak işaretlendi.')),
        );
      }
    } catch (e) {
      if (mounted) {
        setState(() => _isActing = false);
        ScaffoldMessenger.of(context).showSnackBar(
          SnackBar(content: Text('Hata: $e')),
        );
      }
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: AppBar(title: const Text('İş Detayı')),
      body: _buildBody(),
    );
  }

  Widget _buildBody() {
    if (_job == null && _loadError == null) {
      return const Center(child: CircularProgressIndicator(color: AppColors.accent));
    }
    if (_loadError != null && _job == null) {
      return Center(
        child: Column(
          mainAxisSize: MainAxisSize.min,
          children: [
            Container(
              width: 64,
              height: 64,
              decoration: BoxDecoration(
                  color: AppColors.cancelledBg,
                  borderRadius: BorderRadius.circular(16)),
              child: const Icon(Icons.wifi_off_rounded,
                  color: AppColors.cancelled, size: 30),
            ),
            const SizedBox(height: 16),
            Text('Hata: $_loadError',
                style: const TextStyle(color: AppColors.textSecondary)),
            const SizedBox(height: 12),
            FilledButton.icon(
              onPressed: _load,
              icon: const Icon(Icons.refresh_rounded, size: 18),
              label: const Text('Tekrar Dene'),
            ),
          ],
        ),
      );
    }
    if (_job == null) return const Center(child: CircularProgressIndicator(color: AppColors.accent));
    final job = _job!;
    final membership = ref.read(authProvider).activeTenant;
    final canDeliver = membership?.canDeliverJobs ?? true;
    final canCancel  = membership?.canCancelJobs ?? true;
    final canManage  = !(membership?.isDeliveryOnly ?? false);
    return _JobDetailBody(
      job: job,
      filesFuture: _filesFuture,
      isActing: _isActing,
      canDeliver: canDeliver,
      canManage: canManage,
      onApprove: canManage ? () => _approve(job) : () {},
      onRevision: canManage ? () => _requestRevision(job) : () {},
      onDelivered: () => _markDelivered(job),
      onCancel: (canCancel && job.status == JobStatus.pending) ? () => _cancelJob(job) : null,
      onFilesRefresh: _loadFiles,
    );
  }
}

class _JobDetailBody extends StatelessWidget {
  const _JobDetailBody({
    required this.job,
    required this.filesFuture,
    required this.isActing,
    required this.canDeliver,
    required this.canManage,
    required this.onApprove,
    required this.onRevision,
    required this.onDelivered,
    required this.onFilesRefresh,
    this.onCancel,
  });

  final Job job;
  final Future<List<JobFile>> filesFuture;
  final bool isActing;
  final bool canDeliver;
  final bool canManage;
  final VoidCallback onApprove;
  final VoidCallback onRevision;
  final VoidCallback onDelivered;
  final VoidCallback? onCancel;
  final VoidCallback onFilesRefresh;

  @override
  Widget build(BuildContext context) {
    final steps = job.stepTemplate;
    final currentStepIndex =
        job.currentStep != null ? steps.indexOf(job.currentStep!) : -1;

    final canApproveOrRevise = canManage &&
        job.location == JobLocation.atClinic &&
        job.status == JobStatus.inProgress;
    final canMarkDelivered = canDeliver && job.status == JobStatus.sent;

    return ListView(
      padding: const EdgeInsets.all(16),
      children: [
        // Info card
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            color: AppColors.surface,
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: AppColors.border),
            boxShadow: [
              BoxShadow(
                  color: Colors.black.withValues(alpha: 0.05),
                  blurRadius: 12,
                  offset: const Offset(0, 4))
            ],
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              // Patient code + status
              Row(
                children: [
                  Expanded(
                    child: Text(
                      job.patientName?.isNotEmpty == true
                          ? job.patientName!
                          : job.patientCode,
                      style: Theme.of(context).textTheme.headlineSmall
                          ?.copyWith(
                              fontWeight: FontWeight.bold,
                              color: AppColors.textPrimary),
                    ),
                  ),
                  _StatusBadge(status: job.status),
                ],
              ),
              const SizedBox(height: 16),
              const Divider(height: 1, color: AppColors.border),
              const SizedBox(height: 12),

              // Patient + Lab
              _SectionLabel(title: 'Hasta & Laboratuvar'),
              if (job.patientName != null && job.patientName!.isNotEmpty)
                _InfoRow(label: 'Hasta', value: job.patientName!),
              _InfoRow(label: 'Protokol No', value: job.patientCode),
              if (job.patientId != null)
                _InfoRow(label: 'Hasta ID', value: job.patientId!),
              _InfoRow(
                  label: 'Laboratuvar', value: job.labName ?? 'Bilinmiyor'),
              const SizedBox(height: 12),

              // Prosthetic
              _SectionLabel(title: 'Protez Bilgisi'),
              _InfoRow(label: 'Tür', value: job.prostheticType.label),
              if (job.prostheticName != null && job.prostheticName!.isNotEmpty)
                _InfoRow(label: 'Ürün', value: job.prostheticName!),
              if (job.workflowType != null)
                _InfoRow(label: 'İş Tipi', value: job.workflowType!.label),
              _InfoRow(
                label: 'Prova',
                value: job.provaRequired ? 'Provalı' : 'Provasız',
              ),
              _InfoRow(label: 'Üye Sayısı', value: '${job.memberCount}'),
              if (job.teeth.isNotEmpty)
                _InfoRow(label: 'Dişler', value: job.teeth.join(', ')),
              if (job.color != null && job.color!.isNotEmpty)
                _InfoRow(label: 'Renk', value: job.color!),
              if (job.description != null && job.description!.isNotEmpty)
                _InfoRow(label: 'Açıklama', value: job.description!),
              if (job.dueDate != null)
                _InfoRow(label: 'Son Tarih', value: _formatDate(job.dueDate!, withTime: true)),
              if (job.price != null)
                _InfoRow(
                    label: 'Fiyat',
                    value:
                        '${job.price!.toStringAsFixed(2)} ${job.currency ?? 'TRY'}'),
            ],
          ),
        ),

        const SizedBox(height: 16),

        // Stepper card
        Container(
          padding: const EdgeInsets.all(16),
          decoration: BoxDecoration(
            color: AppColors.surface,
            borderRadius: BorderRadius.circular(16),
            border: Border.all(color: AppColors.border),
            boxShadow: [
              BoxShadow(
                  color: Colors.black.withValues(alpha: 0.05),
                  blurRadius: 12,
                  offset: const Offset(0, 4))
            ],
          ),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              const Text(
                'İş Adımları',
                style: TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: AppColors.textPrimary),
              ),
              const SizedBox(height: 16),
              _StepperWidget(
                steps: steps,
                currentStepIndex: currentStepIndex,
                historyFuture: JobHistoryService.instance.listForJob(job.id),
              ),
            ],
          ),
        ),

        const SizedBox(height: 24),

        // Action buttons
        if (isActing)
          const Center(
              child: CircularProgressIndicator(color: AppColors.accent))
        else if (canApproveOrRevise) ...[
          FilledButton.icon(
            onPressed: onApprove,
            icon: const Icon(Icons.check_circle_outline),
            label: const Text('Onayla'),
            style: FilledButton.styleFrom(
              minimumSize: const Size(double.infinity, 50),
              backgroundColor: AppColors.success,
            ),
          ),
          const SizedBox(height: 12),
          OutlinedButton.icon(
            onPressed: onRevision,
            icon: const Icon(Icons.replay_outlined),
            label: const Text('Revizyon İste'),
            style: OutlinedButton.styleFrom(
              minimumSize: const Size(double.infinity, 50),
              foregroundColor: AppColors.pending,
              side: const BorderSide(color: AppColors.pending),
            ),
          ),
        ] else if (canMarkDelivered)
          FilledButton.icon(
            onPressed: onDelivered,
            icon: const Icon(Icons.inventory_2_outlined),
            label: const Text('Teslim Aldım'),
            style: FilledButton.styleFrom(
              minimumSize: const Size(double.infinity, 50),
            ),
          ),

        if (onCancel != null) ...[
          const SizedBox(height: 12),
          OutlinedButton.icon(
            onPressed: onCancel,
            icon: const Icon(Icons.close_rounded),
            label: const Text('İşi İptal Et'),
            style: OutlinedButton.styleFrom(
              minimumSize: const Size(double.infinity, 50),
              foregroundColor: AppColors.cancelled,
              side: const BorderSide(color: AppColors.cancelled),
            ),
          ),
        ],

        const SizedBox(height: 20),

        // Files panel
        JobFilesPanel(
          job: job,
          filesFuture: filesFuture,
          onRefresh: onFilesRefresh,
        ),

        const SizedBox(height: 12),
        Text(
          'Oluşturulma: ${_formatDate(job.dateCreated)}',
          style: const TextStyle(fontSize: 12, color: AppColors.textMuted),
          textAlign: TextAlign.center,
        ),
        const SizedBox(height: 8),
      ],
    );
  }

  String _formatDate(DateTime d, {bool withTime = false}) {
    final s = '${d.day.toString().padLeft(2, '0')}.${d.month.toString().padLeft(2, '0')}.${d.year}';
    if (!withTime || (d.hour == 0 && d.minute == 0)) return s;
    return '$s  ${d.hour.toString().padLeft(2, '0')}:${d.minute.toString().padLeft(2, '0')}';
  }
}

class _StepperWidget extends StatelessWidget {
  const _StepperWidget({
    required this.steps,
    required this.currentStepIndex,
    required this.historyFuture,
  });

  final List<JobStep> steps;
  final int currentStepIndex;
  final Future<List<JobHistoryEntry>> historyFuture;

  @override
  Widget build(BuildContext context) {
    return FutureBuilder<List<JobHistoryEntry>>(
      future: historyFuture,
      builder: (ctx, snap) {
        final history = snap.data ?? [];
        final Map<JobStep, int> revisionCounts = {};
        final Map<JobStep, List<JobHistoryEntry>> notesByStep = {};
        for (final e in history) {
          if (e.action == JobHistoryAction.revisionRequested && e.step != null) {
            revisionCounts[e.step!] = (revisionCounts[e.step!] ?? 0) + 1;
          }
          if (e.step != null && e.note != null && e.note!.trim().isNotEmpty) {
            notesByStep.putIfAbsent(e.step!, () => []).add(e);
          }
        }

        return Column(
          children: steps.asMap().entries.map((entry) {
            final index = entry.key;
            final step = entry.value;
            final isCompleted = index < currentStepIndex;
            final isCurrent = index == currentStepIndex;
            final revCount = revisionCounts[step] ?? 0;
            final stepNotes = notesByStep[step] ?? const <JobHistoryEntry>[];

            Color dotColor;
            IconData dotIcon;
            if (isCompleted) {
              dotColor = AppColors.success;
              dotIcon = Icons.check_circle;
            } else if (isCurrent) {
              dotColor = AppColors.inProgress;
              dotIcon = Icons.radio_button_checked;
            } else {
              dotColor = AppColors.muted;
              dotIcon = Icons.radio_button_unchecked;
            }

            return Row(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Column(
                  children: [
                    Icon(dotIcon, color: dotColor, size: 24),
                    if (index < steps.length - 1)
                      Container(
                        width: 2,
                        height: 44,
                        color: index < currentStepIndex
                            ? AppColors.success.withValues(alpha: 0.35)
                            : AppColors.border,
                      ),
                  ],
                ),
                const SizedBox(width: 12),
                Expanded(
                  child: Padding(
                    padding: const EdgeInsets.only(top: 2, bottom: 12),
                    child: Column(
                      crossAxisAlignment: CrossAxisAlignment.start,
                      children: [
                        Row(
                          children: [
                            Text(
                              step.label,
                              style: TextStyle(
                                fontWeight: isCurrent
                                    ? FontWeight.bold
                                    : FontWeight.normal,
                                color: isCompleted
                                    ? AppColors.success
                                    : isCurrent
                                        ? AppColors.inProgress
                                        : AppColors.textMuted,
                                fontSize: 15,
                              ),
                            ),
                            if (revCount > 0) ...[
                              const SizedBox(width: 6),
                              Container(
                                padding: const EdgeInsets.symmetric(
                                    horizontal: 6, vertical: 1),
                                decoration: BoxDecoration(
                                  color: AppColors.cancelledBg,
                                  borderRadius: BorderRadius.circular(6),
                                ),
                                child: Text(
                                  '$revCount revizyon',
                                  style: const TextStyle(
                                    fontSize: 10,
                                    fontWeight: FontWeight.w700,
                                    color: AppColors.cancelled,
                                  ),
                                ),
                              ),
                            ],
                          ],
                        ),
                        if (isCurrent)
                          Text(
                            step.description,
                            style: const TextStyle(
                              fontSize: 12,
                              color: AppColors.textSecondary,
                            ),
                          ),
                        if (stepNotes.isNotEmpty) ...[
                          const SizedBox(height: 8),
                          ...stepNotes.map((entry) => _StepNoteCard(entry: entry)),
                        ],
                      ],
                    ),
                  ),
                ),
              ],
            );
          }).toList(),
        );
      },
    );
  }
}

class _StepNoteCard extends StatelessWidget {
  const _StepNoteCard({required this.entry});

  final JobHistoryEntry entry;

  @override
  Widget build(BuildContext context) {
    return Container(
      width: double.infinity,
      margin: const EdgeInsets.only(top: 6),
      padding: const EdgeInsets.symmetric(horizontal: 10, vertical: 8),
      decoration: BoxDecoration(
        color: AppColors.surfaceVariant,
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: AppColors.border),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Text(
            _label(entry.action),
            style: const TextStyle(
              fontSize: 11,
              fontWeight: FontWeight.w700,
              color: AppColors.textSecondary,
            ),
          ),
          const SizedBox(height: 4),
          Text(
            entry.note!,
            style: const TextStyle(
              fontSize: 12,
              color: AppColors.textPrimary,
            ),
          ),
        ],
      ),
    );
  }

  String _label(JobHistoryAction action) {
    return switch (action) {
      JobHistoryAction.revisionRequested => 'Revizyon Notu',
      JobHistoryAction.handedToClinic => 'Laboratuvar Notu',
      JobHistoryAction.approved => 'Onay Notu',
      JobHistoryAction.delivered => 'Teslim Notu',
      JobHistoryAction.accepted => 'Kabul Notu',
      JobHistoryAction.cancelled => 'İptal Notu',
    };
  }
}

class _SectionLabel extends StatelessWidget {
  const _SectionLabel({required this.title});
  final String title;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.only(bottom: 6),
      child: Text(
        title,
        style: const TextStyle(
            fontSize: 11,
            fontWeight: FontWeight.w600,
            color: AppColors.accent,
            letterSpacing: 0.5),
      ),
    );
  }
}

class _InfoRow extends StatelessWidget {
  const _InfoRow({required this.label, required this.value});
  final String label;
  final String value;

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          SizedBox(
            width: 110,
            child: Text(
              label,
              style: const TextStyle(
                  fontSize: 13, color: AppColors.textSecondary),
            ),
          ),
          Expanded(
            child: Text(
              value,
              style: const TextStyle(
                  fontSize: 14,
                  fontWeight: FontWeight.w500,
                  color: AppColors.textPrimary),
            ),
          ),
        ],
      ),
    );
  }
}

class _StatusBadge extends StatelessWidget {
  const _StatusBadge({required this.status});
  final JobStatus status;

  @override
  Widget build(BuildContext context) {
    final color = _color(status);
    final bg = _bg(status);
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 5),
      decoration: BoxDecoration(
        color: bg,
        borderRadius: BorderRadius.circular(10),
      ),
      child: Text(
        status.label,
        style: TextStyle(
          color: color,
          fontSize: 13,
          fontWeight: FontWeight.w600,
        ),
      ),
    );
  }

  Color _color(JobStatus s) {
    switch (s) {
      case JobStatus.pending:
        return AppColors.pending;
      case JobStatus.inProgress:
        return AppColors.inProgress;
      case JobStatus.sent:
        return AppColors.accent;
      case JobStatus.delivered:
        return AppColors.success;
      case JobStatus.cancelled:
        return AppColors.cancelled;
    }
  }

  Color _bg(JobStatus s) {
    switch (s) {
      case JobStatus.pending:
        return AppColors.pendingBg;
      case JobStatus.inProgress:
        return AppColors.inProgressBg;
      case JobStatus.sent:
        return AppColors.inProgressBg;
      case JobStatus.delivered:
        return AppColors.successBg;
      case JobStatus.cancelled:
        return AppColors.cancelledBg;
    }
  }
}