import 'package:flutter/material.dart';
import '../../theme/app_theme.dart';

enum SidebarScreen { home, timeline, agents, toolbelt, tokens }

class Sidebar extends StatelessWidget {
  final SidebarScreen selected;
  final ValueChanged<SidebarScreen> onSelect;
  final bool hasSession;

  const Sidebar({
    super.key,
    required this.selected,
    required this.onSelect,
    required this.hasSession,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 220,
      decoration: const BoxDecoration(
        color: AppColors.surface,
        border: Border(
          right: BorderSide(color: AppColors.surfaceBorder, width: 1),
        ),
      ),
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.stretch,
        children: [
          const SizedBox(height: 40),
          Padding(
            padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 12),
            child: Row(
              children: [
                Container(
                  width: 28,
                  height: 28,
                  decoration: BoxDecoration(
                    color: AppColors.assistant.withAlpha(30),
                    borderRadius: BorderRadius.circular(6),
                  ),
                  child: const Icon(
                    Icons.terminal,
                    size: 16,
                    color: AppColors.assistant,
                  ),
                ),
                const SizedBox(width: 10),
                const Text(
                  'Session Viewer',
                  style: TextStyle(
                    fontSize: 14,
                    fontWeight: FontWeight.w600,
                    color: AppColors.textPrimary,
                  ),
                ),
              ],
            ),
          ),
          const SizedBox(height: 8),
          _SidebarItem(
            icon: Icons.folder_open,
            label: 'Open Session',
            isSelected: selected == SidebarScreen.home,
            onTap: () => onSelect(SidebarScreen.home),
          ),
          if (hasSession) ...[
            const Padding(
              padding: EdgeInsets.symmetric(horizontal: 16, vertical: 8),
              child: Text(
                'SESSION',
                style: TextStyle(
                  fontSize: 10,
                  fontWeight: FontWeight.w600,
                  color: AppColors.textMuted,
                  letterSpacing: 1.2,
                ),
              ),
            ),
            _SidebarItem(
              icon: Icons.timeline,
              label: 'Timeline',
              isSelected: selected == SidebarScreen.timeline,
              onTap: () => onSelect(SidebarScreen.timeline),
            ),
            _SidebarItem(
              icon: Icons.smart_toy_outlined,
              label: 'Agents',
              isSelected: selected == SidebarScreen.agents,
              onTap: () => onSelect(SidebarScreen.agents),
            ),
            _SidebarItem(
              icon: Icons.build_outlined,
              label: 'Toolbelt',
              isSelected: selected == SidebarScreen.toolbelt,
              onTap: () => onSelect(SidebarScreen.toolbelt),
            ),
            _SidebarItem(
              icon: Icons.data_usage,
              label: 'Token Usage',
              isSelected: selected == SidebarScreen.tokens,
              onTap: () => onSelect(SidebarScreen.tokens),
            ),
          ],
          const Spacer(),
          Padding(
            padding: const EdgeInsets.all(16),
            child: Text(
              'Claude Session Viewer v0.1',
              style: TextStyle(
                fontSize: 10,
                color: AppColors.textMuted.withAlpha(128),
              ),
            ),
          ),
        ],
      ),
    );
  }
}

class _SidebarItem extends StatefulWidget {
  final IconData icon;
  final String label;
  final bool isSelected;
  final VoidCallback onTap;

  const _SidebarItem({
    required this.icon,
    required this.label,
    required this.isSelected,
    required this.onTap,
  });

  @override
  State<_SidebarItem> createState() => _SidebarItemState();
}

class _SidebarItemState extends State<_SidebarItem> {
  bool _hovered = false;

  @override
  Widget build(BuildContext context) {
    return MouseRegion(
      onEnter: (_) => setState(() => _hovered = true),
      onExit: (_) => setState(() => _hovered = false),
      child: GestureDetector(
        onTap: widget.onTap,
        child: Container(
          margin: const EdgeInsets.symmetric(horizontal: 8, vertical: 1),
          padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
          decoration: BoxDecoration(
            color: widget.isSelected
                ? AppColors.assistant.withAlpha(20)
                : _hovered
                    ? AppColors.surfaceLight
                    : Colors.transparent,
            borderRadius: BorderRadius.circular(6),
          ),
          child: Row(
            children: [
              Icon(
                widget.icon,
                size: 18,
                color: widget.isSelected
                    ? AppColors.assistant
                    : AppColors.textSecondary,
              ),
              const SizedBox(width: 10),
              Text(
                widget.label,
                style: TextStyle(
                  fontSize: 13,
                  fontWeight:
                      widget.isSelected ? FontWeight.w600 : FontWeight.w400,
                  color: widget.isSelected
                      ? AppColors.textPrimary
                      : AppColors.textSecondary,
                ),
              ),
            ],
          ),
        ),
      ),
    );
  }
}