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

import '../../core/providers/auth_provider.dart';
import '../../core/services/ai_actions.dart';
import '../../core/services/ai_context_builder.dart';
import '../../core/services/ai_service.dart';
import '../../core/theme/app_theme.dart';
import '../../core/utils/file_download_helper.dart';
import '../../models/job_file.dart';
import '../../models/tenant.dart';

class AiChatScreen extends ConsumerStatefulWidget {
  const AiChatScreen({super.key});

  @override
  ConsumerState<AiChatScreen> createState() => _AiChatScreenState();
}

class _AiChatScreenState extends ConsumerState<AiChatScreen> {
  final _inputController = TextEditingController();
  final _scrollController = ScrollController();
  final List<_Message> _messages = [];

  String? _systemPrompt;
  bool _loadingContext = true;
  bool _streaming = false;

  @override
  void initState() {
    super.initState();
    _loadContext();
  }

  @override
  void dispose() {
    _inputController.dispose();
    _scrollController.dispose();
    super.dispose();
  }

  Future<void> _loadContext() async {
    try {
      final membership = ref.read(authProvider).activeTenant!;
      final prompt = await AiContextBuilder.instance.build(membership);
      if (mounted) setState(() { _systemPrompt = prompt; _loadingContext = false; });
    } catch (_) {
      if (mounted) setState(() => _loadingContext = false);
    }
  }

  Future<void> _send([String? override]) async {
    final text = (override ?? _inputController.text).trim();
    if (text.isEmpty || _streaming || _systemPrompt == null) return;
    _inputController.clear();
    FocusScope.of(context).unfocus();

    final apiMessages = [
      ..._messages.map((m) => {'role': m.isUser ? 'user' : 'assistant', 'content': m.rawText}),
      {'role': 'user', 'content': text},
    ];

    setState(() {
      _messages.add(_Message.user(text));
      _messages.add(_Message.assistantStreaming());
      _streaming = true;
    });
    _scrollToBottom();

    var accumulated = '';
    try {
      final stream = AiService.instance.streamChat(
        systemPrompt: _systemPrompt!,
        messages: apiMessages,
      );
      await for (final chunk in stream) {
        if (!mounted) break;
        accumulated += chunk;
        setState(() => _messages[_messages.length - 1] = _Message.assistantStreaming(accumulated));
        _scrollToBottom();
      }
      if (mounted) {
        setState(() => _messages[_messages.length - 1] = _Message.assistantDone(accumulated));
      }
    } catch (e) {
      if (mounted) {
        setState(() => _messages[_messages.length - 1] = _Message.error('Bir hata olustu, tekrar deneyin.'));
      }
    } finally {
      if (mounted) setState(() => _streaming = false);
    }
  }

  void _scrollToBottom() {
    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (_scrollController.hasClients) {
        _scrollController.animateTo(
          _scrollController.position.maxScrollExtent,
          duration: const Duration(milliseconds: 200),
          curve: Curves.easeOut,
        );
      }
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      backgroundColor: AppColors.background,
      appBar: AppBar(
        title: Row(
          children: [
            Container(
              width: 28,
              height: 28,
              decoration: BoxDecoration(
                color: AppColors.accent,
                borderRadius: BorderRadius.circular(8),
              ),
              child: const Icon(Icons.auto_awesome, size: 16, color: Colors.white),
            ),
            const SizedBox(width: 10),
            const Text('AI Asistan'),
          ],
        ),
        actions: [
          if (_messages.isNotEmpty)
            IconButton(
              onPressed: () => setState(() => _messages.clear()),
              icon: const Icon(Icons.refresh_outlined, size: 20),
              tooltip: 'Sohbeti temizle',
            ),
        ],
      ),
      body: Column(
        children: [
          Expanded(
            child: _loadingContext
                ? const _LoadingContext()
                : _messages.isEmpty
                    ? _WelcomeView(onSuggestion: _send)
                    : ListView.builder(
                        controller: _scrollController,
                        padding: const EdgeInsets.fromLTRB(16, 12, 16, 8),
                        itemCount: _messages.length,
                        itemBuilder: (_, i) => _MessageBubble(
                          message: _messages[i],
                          membership: ref.read(authProvider).activeTenant!,
                        ),
                      ),
          ),
          _InputBar(
            controller: _inputController,
            enabled: !_loadingContext && !_streaming,
            streaming: _streaming,
            onSend: _send,
          ),
        ],
      ),
    );
  }
}

// ── Message model ─────────────────────────────────────────────────────────────

enum _MsgKind { user, streaming, done, error }

class _Message {
  _Message._({required this.kind, required this.rawText});

  factory _Message.user(String text) =>
      _Message._(kind: _MsgKind.user, rawText: text);

  factory _Message.assistantStreaming([String text = '']) =>
      _Message._(kind: _MsgKind.streaming, rawText: text);

  factory _Message.assistantDone(String text) =>
      _Message._(kind: _MsgKind.done, rawText: text);

  factory _Message.error(String text) =>
      _Message._(kind: _MsgKind.error, rawText: text);

  final _MsgKind kind;
  final String rawText;

  bool get isUser => kind == _MsgKind.user;
  bool get isStreaming => kind == _MsgKind.streaming;
  bool get isError => kind == _MsgKind.error;
}

// ── Welcome view ──────────────────────────────────────────────────────────────

class _WelcomeView extends StatelessWidget {
  const _WelcomeView({required this.onSuggestion});
  final void Function(String) onSuggestion;

  static const _suggestions = [
    'Bekleyen islerimin ozeti nedir?',
    'Gecikmiş iş var mı?',
    'Bu ay kac is tamamlandi?',
    'Revizyon oranım ne durumda?',
    'Finans durumumu ozetle.',
    'Son yuklenen dosyalari goster.',
  ];

  @override
  Widget build(BuildContext context) {
    return SingleChildScrollView(
      padding: const EdgeInsets.fromLTRB(20, 32, 20, 12),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            width: 56,
            height: 56,
            decoration: BoxDecoration(
              color: AppColors.accent,
              borderRadius: BorderRadius.circular(16),
            ),
            child: const Icon(Icons.auto_awesome, size: 28, color: Colors.white),
          ),
          const SizedBox(height: 16),
          const Text(
            'Merhaba! Size nasil yardimci olabilirim?',
            style: TextStyle(fontSize: 20, fontWeight: FontWeight.w700, color: AppColors.textPrimary),
          ),
          const SizedBox(height: 6),
          const Text(
            'Isler, finans ve ekip hakkinda soru sorabilir, islem yapabilirsiniz.',
            style: TextStyle(fontSize: 14, color: AppColors.textSecondary),
          ),
          const SizedBox(height: 28),
          const Text(
            'ONERILER',
            style: TextStyle(fontSize: 11, fontWeight: FontWeight.w700, color: AppColors.textMuted, letterSpacing: 0.8),
          ),
          const SizedBox(height: 10),
          Wrap(
            spacing: 8,
            runSpacing: 8,
            children: _suggestions
                .map((s) => _SuggestionChip(label: s, onTap: () => onSuggestion(s)))
                .toList(),
          ),
        ],
      ),
    );
  }
}

class _SuggestionChip extends StatelessWidget {
  const _SuggestionChip({required this.label, required this.onTap});
  final String label;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 9),
        decoration: BoxDecoration(
          color: AppColors.surface,
          borderRadius: BorderRadius.circular(20),
          border: Border.all(color: AppColors.border),
        ),
        child: Text(label, style: const TextStyle(fontSize: 13, color: AppColors.textPrimary)),
      ),
    );
  }
}

// ── Message bubble ────────────────────────────────────────────────────────────

class _MessageBubble extends StatelessWidget {
  const _MessageBubble({required this.message, required this.membership});
  final _Message message;
  final TenantMembership membership;

  @override
  Widget build(BuildContext context) {
    if (message.isUser) {
      return Padding(
        padding: const EdgeInsets.symmetric(vertical: 4),
        child: Row(
          mainAxisAlignment: MainAxisAlignment.end,
          children: [
            Flexible(
              child: Container(
                padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
                decoration: BoxDecoration(
                  color: AppColors.accent,
                  borderRadius: const BorderRadius.only(
                    topLeft: Radius.circular(16),
                    topRight: Radius.circular(16),
                    bottomLeft: Radius.circular(16),
                    bottomRight: Radius.circular(4),
                  ),
                ),
                child: Text(
                  message.rawText,
                  style: const TextStyle(fontSize: 14, height: 1.5, color: Colors.white),
                ),
              ),
            ),
          ],
        ),
      );
    }

    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 4),
      child: Row(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          Container(
            width: 28,
            height: 28,
            margin: const EdgeInsets.only(right: 8, top: 2),
            decoration: BoxDecoration(color: AppColors.accent, borderRadius: BorderRadius.circular(8)),
            child: const Icon(Icons.auto_awesome, size: 14, color: Colors.white),
          ),
          Flexible(
            child: Container(
              padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
              decoration: BoxDecoration(
                color: AppColors.surface,
                borderRadius: const BorderRadius.only(
                  topLeft: Radius.circular(4),
                  topRight: Radius.circular(16),
                  bottomLeft: Radius.circular(16),
                  bottomRight: Radius.circular(16),
                ),
                border: Border.all(color: AppColors.border),
              ),
              child: message.isStreaming && message.rawText.isEmpty
                  ? const _TypingDots()
                  : _MessageContent(message: message, membership: membership),
            ),
          ),
        ],
      ),
    );
  }
}

// ── Message content: markdown + action buttons ────────────────────────────────

class _MessageContent extends StatelessWidget {
  const _MessageContent({required this.message, required this.membership});
  final _Message message;
  final TenantMembership membership;

  @override
  Widget build(BuildContext context) {
    if (message.isError) {
      return Text(
        message.rawText,
        style: const TextStyle(fontSize: 14, height: 1.5, color: AppColors.cancelled),
      );
    }

    // During streaming: show raw text without parsing actions
    if (message.isStreaming) {
      return _MarkdownText(message.rawText, color: AppColors.textPrimary);
    }

    // Done: parse segments → text + action buttons
    final segments = parseSegments(message.rawText);
    if (segments.isEmpty) {
      return _MarkdownText(message.rawText, color: AppColors.textPrimary);
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisSize: MainAxisSize.min,
      children: segments.map((seg) {
        if (seg is TextSegment) {
          return _MarkdownText(seg.text, color: AppColors.textPrimary);
        }
        if (seg is ActionSegment) {
          return Padding(
            padding: const EdgeInsets.only(top: 10),
            child: _ActionCard(action: seg.action, membership: membership),
          );
        }
        return const SizedBox.shrink();
      }).toList(),
    );
  }
}

// ── Action card ───────────────────────────────────────────────────────────────

enum _ActionState { idle, confirming, loading, success, error, files }

class _ActionCard extends StatefulWidget {
  const _ActionCard({required this.action, required this.membership});
  final AiAction action;
  final TenantMembership membership;

  @override
  State<_ActionCard> createState() => _ActionCardState();
}

class _ActionCardState extends State<_ActionCard> {
  _ActionState _state = _ActionState.idle;
  String _resultMsg = '';
  List<JobFile> _files = [];

  AiAction get action => widget.action;

  Future<void> _execute() async {
    setState(() => _state = _ActionState.loading);
    final outcome = await AiActionExecutor.execute(action, widget.membership);
    if (!mounted) return;
    switch (outcome) {
      case ActionSuccess(:final message):
        setState(() { _state = _ActionState.success; _resultMsg = message; });
      case ActionError(:final error):
        setState(() { _state = _ActionState.error; _resultMsg = error; });
      case ActionFiles(:final files):
        setState(() { _state = _ActionState.files; _files = files; });
    }
  }

  void _onTap() {
    if (action.isDangerous) {
      setState(() => _state = _ActionState.confirming);
    } else {
      _execute();
    }
  }

  @override
  Widget build(BuildContext context) {
    return switch (_state) {
      _ActionState.idle      => _idleButton(),
      _ActionState.confirming => _confirmCard(),
      _ActionState.loading   => _loadingCard(),
      _ActionState.success   => _resultCard(success: true),
      _ActionState.error     => _resultCard(success: false),
      _ActionState.files     => _filesCard(),
    };
  }

  Widget _idleButton() {
    final isDanger = action.isDangerous;
    final isFile = action.isFileAction;
    final color = isDanger
        ? AppColors.cancelled
        : isFile
            ? AppColors.inProgress
            : AppColors.accent;
    final bgColor = isDanger
        ? AppColors.cancelledBg
        : isFile
            ? AppColors.inProgressBg
            : AppColors.accent.withValues(alpha: 0.1);
    final icon = isDanger
        ? Icons.cancel_outlined
        : isFile
            ? Icons.folder_outlined
            : action.type == 'add_member'
                ? Icons.person_add_outlined
                : Icons.check_circle_outline;

    return GestureDetector(
      onTap: _onTap,
      child: Container(
        padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
        decoration: BoxDecoration(
          color: bgColor,
          borderRadius: BorderRadius.circular(10),
          border: Border.all(color: color.withValues(alpha: 0.3)),
        ),
        child: Row(
          mainAxisSize: MainAxisSize.min,
          children: [
            Icon(icon, size: 16, color: color),
            const SizedBox(width: 8),
            Flexible(
              child: Text(
                action.label,
                style: TextStyle(fontSize: 13, fontWeight: FontWeight.w600, color: color),
              ),
            ),
          ],
        ),
      ),
    );
  }

  Widget _confirmCard() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: AppColors.cancelledBg,
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: AppColors.cancelled.withValues(alpha: 0.3)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          Row(
            children: [
              const Icon(Icons.warning_amber_rounded, size: 16, color: AppColors.cancelled),
              const SizedBox(width: 6),
              const Expanded(
                child: Text(
                  'Bu islem geri alinamayabilir.',
                  style: TextStyle(fontSize: 12, fontWeight: FontWeight.w600, color: AppColors.cancelled),
                ),
              ),
            ],
          ),
          const SizedBox(height: 4),
          Text(action.label, style: const TextStyle(fontSize: 13, color: AppColors.textPrimary)),
          const SizedBox(height: 10),
          Row(
            children: [
              Expanded(
                child: OutlinedButton(
                  onPressed: () => setState(() => _state = _ActionState.idle),
                  style: OutlinedButton.styleFrom(
                    padding: const EdgeInsets.symmetric(vertical: 8),
                    side: BorderSide(color: AppColors.border),
                  ),
                  child: const Text('Vazgec', style: TextStyle(fontSize: 13)),
                ),
              ),
              const SizedBox(width: 8),
              Expanded(
                child: FilledButton(
                  onPressed: _execute,
                  style: FilledButton.styleFrom(
                    backgroundColor: AppColors.cancelled,
                    padding: const EdgeInsets.symmetric(vertical: 8),
                  ),
                  child: const Text('Onayla', style: TextStyle(fontSize: 13)),
                ),
              ),
            ],
          ),
        ],
      ),
    );
  }

  Widget _loadingCard() {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
      decoration: BoxDecoration(
        color: AppColors.background,
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: AppColors.border),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          const SizedBox(
            width: 14,
            height: 14,
            child: CircularProgressIndicator(strokeWidth: 2, color: AppColors.accent),
          ),
          const SizedBox(width: 8),
          Text('Isleniyor...', style: const TextStyle(fontSize: 13, color: AppColors.textSecondary)),
        ],
      ),
    );
  }

  Widget _resultCard({required bool success}) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 10),
      decoration: BoxDecoration(
        color: success ? AppColors.successBg : AppColors.cancelledBg,
        borderRadius: BorderRadius.circular(10),
      ),
      child: Row(
        mainAxisSize: MainAxisSize.min,
        children: [
          Icon(
            success ? Icons.check_circle_outline : Icons.error_outline,
            size: 16,
            color: success ? AppColors.success : AppColors.cancelled,
          ),
          const SizedBox(width: 8),
          Flexible(
            child: Text(
              _resultMsg,
              style: TextStyle(
                fontSize: 13,
                fontWeight: FontWeight.w500,
                color: success ? AppColors.success : AppColors.cancelled,
              ),
            ),
          ),
        ],
      ),
    );
  }

  Widget _filesCard() {
    return Container(
      padding: const EdgeInsets.all(12),
      decoration: BoxDecoration(
        color: AppColors.inProgressBg,
        borderRadius: BorderRadius.circular(10),
        border: Border.all(color: AppColors.inProgress.withValues(alpha: 0.2)),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        mainAxisSize: MainAxisSize.min,
        children: [
          Row(
            children: [
              const Icon(Icons.folder_open_outlined, size: 15, color: AppColors.inProgress),
              const SizedBox(width: 6),
              Text(
                '${_files.length} dosya',
                style: const TextStyle(fontSize: 12, fontWeight: FontWeight.w700, color: AppColors.inProgress),
              ),
            ],
          ),
          const SizedBox(height: 8),
          ..._files.map((f) => _FileDownloadRow(file: f)),
        ],
      ),
    );
  }
}

// ── File download row ─────────────────────────────────────────────────────────

class _FileDownloadRow extends StatefulWidget {
  const _FileDownloadRow({required this.file});
  final JobFile file;

  @override
  State<_FileDownloadRow> createState() => _FileDownloadRowState();
}

class _FileDownloadRowState extends State<_FileDownloadRow> {
  bool _downloading = false;

  IconData get _icon => switch (widget.file.kind) {
        JobFileKind.scan => Icons.view_in_ar_rounded,
        JobFileKind.image => Icons.image_outlined,
        JobFileKind.document => Icons.description_outlined,
      };

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(vertical: 3),
      child: Row(
        children: [
          Icon(_icon, size: 14, color: AppColors.inProgress),
          const SizedBox(width: 6),
          Expanded(
            child: Text(
              widget.file.name,
              style: const TextStyle(fontSize: 12, color: AppColors.textPrimary),
              maxLines: 1,
              overflow: TextOverflow.ellipsis,
            ),
          ),
          const SizedBox(width: 4),
          Text(
            widget.file.sizeLabel,
            style: const TextStyle(fontSize: 11, color: AppColors.textMuted),
          ),
          const SizedBox(width: 6),
          _downloading
              ? const SizedBox(
                  width: 16,
                  height: 16,
                  child: CircularProgressIndicator(strokeWidth: 1.5, color: AppColors.inProgress),
                )
              : GestureDetector(
                  onTap: () async {
                    setState(() => _downloading = true);
                    await FileDownloadHelper.download(context, widget.file);
                    if (mounted) setState(() => _downloading = false);
                  },
                  child: const Icon(Icons.download_outlined, size: 18, color: AppColors.inProgress),
                ),
        ],
      ),
    );
  }
}

// ── Simple markdown renderer ──────────────────────────────────────────────────

class _MarkdownText extends StatelessWidget {
  const _MarkdownText(this.text, {required this.color});
  final String text;
  final Color color;

  @override
  Widget build(BuildContext context) {
    if (text.isEmpty) return const SizedBox.shrink();
    final lines = text.split('\n');
    final widgets = <Widget>[];
    bool prevEmpty = false;

    for (final raw in lines) {
      final line = raw.trimRight();
      if (line.isEmpty) {
        if (!prevEmpty) widgets.add(const SizedBox(height: 6));
        prevEmpty = true;
        continue;
      }
      prevEmpty = false;

      // Header ## or ###
      if (line.startsWith('## ') || line.startsWith('### ')) {
        final content = line.replaceFirst(RegExp(r'^#{2,3}\s+'), '');
        widgets.add(Padding(
          padding: const EdgeInsets.only(top: 4, bottom: 2),
          child: Text(
            content,
            style: TextStyle(fontSize: 14, fontWeight: FontWeight.w700, color: color),
          ),
        ));
        continue;
      }

      // Bullet
      if (line.startsWith('- ') || line.startsWith('• ')) {
        final content = line.substring(2);
        widgets.add(Padding(
          padding: const EdgeInsets.only(left: 4),
          child: Row(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Text('• ', style: TextStyle(color: color, height: 1.5, fontSize: 14)),
              Expanded(child: _inlineText(content, color)),
            ],
          ),
        ));
        continue;
      }

      widgets.add(_inlineText(line, color));
    }

    return Column(
      crossAxisAlignment: CrossAxisAlignment.start,
      mainAxisSize: MainAxisSize.min,
      children: widgets,
    );
  }

  Widget _inlineText(String text, Color baseColor) {
    final spans = <InlineSpan>[];
    final boldPattern = RegExp(r'\*\*(.+?)\*\*');
    int last = 0;

    for (final m in boldPattern.allMatches(text)) {
      if (m.start > last) {
        spans.add(TextSpan(text: text.substring(last, m.start)));
      }
      spans.add(TextSpan(
        text: m.group(1),
        style: const TextStyle(fontWeight: FontWeight.w700),
      ));
      last = m.end;
    }
    if (last < text.length) spans.add(TextSpan(text: text.substring(last)));

    return RichText(
      text: TextSpan(
        style: TextStyle(fontSize: 14, height: 1.5, color: baseColor),
        children: spans,
      ),
    );
  }
}

// ── Typing dots ───────────────────────────────────────────────────────────────

class _TypingDots extends StatefulWidget {
  const _TypingDots();
  @override
  State<_TypingDots> createState() => _TypingDotsState();
}

class _TypingDotsState extends State<_TypingDots> with SingleTickerProviderStateMixin {
  late final AnimationController _ctrl;

  @override
  void initState() {
    super.initState();
    _ctrl = AnimationController(vsync: this, duration: const Duration(milliseconds: 900))..repeat();
  }

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

  @override
  Widget build(BuildContext context) {
    return SizedBox(
      height: 18,
      child: AnimatedBuilder(
        animation: _ctrl,
        builder: (_, __) => Row(
          mainAxisSize: MainAxisSize.min,
          children: List.generate(3, (i) {
            final t = ((_ctrl.value * 3) - i).clamp(0.0, 1.0);
            final opacity = (t < 0.5 ? t * 2 : (1 - t) * 2).clamp(0.3, 1.0);
            return Container(
              width: 6, height: 6,
              margin: const EdgeInsets.symmetric(horizontal: 2),
              decoration: BoxDecoration(
                color: AppColors.accent.withValues(alpha: opacity),
                shape: BoxShape.circle,
              ),
            );
          }),
        ),
      ),
    );
  }
}

// ── Input bar ─────────────────────────────────────────────────────────────────

class _InputBar extends StatelessWidget {
  const _InputBar({
    required this.controller,
    required this.enabled,
    required this.streaming,
    required this.onSend,
  });

  final TextEditingController controller;
  final bool enabled;
  final bool streaming;
  final VoidCallback onSend;

  @override
  Widget build(BuildContext context) {
    final bottom = MediaQuery.paddingOf(context).bottom;
    return Container(
      padding: EdgeInsets.fromLTRB(12, 8, 12, 8 + bottom),
      decoration: BoxDecoration(
        color: AppColors.surface,
        border: Border(top: BorderSide(color: AppColors.border)),
      ),
      child: Row(
        children: [
          Expanded(
            child: TextField(
              controller: controller,
              enabled: enabled,
              maxLines: 4,
              minLines: 1,
              textInputAction: TextInputAction.send,
              onSubmitted: (_) => onSend(),
              decoration: InputDecoration(
                hintText: streaming ? 'Yanit bekleniyor...' : 'Bir sey sorun...',
                hintStyle: const TextStyle(color: AppColors.textMuted),
                border: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(22),
                  borderSide: BorderSide(color: AppColors.border),
                ),
                enabledBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(22),
                  borderSide: BorderSide(color: AppColors.border),
                ),
                focusedBorder: OutlineInputBorder(
                  borderRadius: BorderRadius.circular(22),
                  borderSide: const BorderSide(color: AppColors.accent, width: 1.5),
                ),
                contentPadding: const EdgeInsets.symmetric(horizontal: 16, vertical: 10),
                isDense: true,
              ),
            ),
          ),
          const SizedBox(width: 8),
          GestureDetector(
            onTap: enabled ? onSend : null,
            child: AnimatedContainer(
              duration: const Duration(milliseconds: 200),
              width: 40,
              height: 40,
              decoration: BoxDecoration(
                color: enabled ? AppColors.accent : AppColors.border,
                shape: BoxShape.circle,
              ),
              child: Center(
                child: streaming
                    ? const SizedBox(
                        width: 16,
                        height: 16,
                        child: CircularProgressIndicator(strokeWidth: 2, color: Colors.white),
                      )
                    : const Icon(Icons.arrow_upward_rounded, color: Colors.white, size: 18),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

// ── Loading context ───────────────────────────────────────────────────────────

class _LoadingContext extends StatelessWidget {
  const _LoadingContext();

  @override
  Widget build(BuildContext context) {
    return const Center(
      child: Column(
        mainAxisSize: MainAxisSize.min,
        children: [
          CircularProgressIndicator(color: AppColors.accent, strokeWidth: 2),
          SizedBox(height: 12),
          Text('Veriler yukleniyor...', style: TextStyle(color: AppColors.textSecondary, fontSize: 13)),
        ],
      ),
    );
  }
}