import 'package:flutter/material.dart';

import 'oto_agent_panel.dart';
import 'oto_console_contract.dart';

class OtoConsoleShell extends StatefulWidget {
  final Widget overview;
  final Widget? runners;
  final Widget? pipelines;
  final Widget? executions;
  final Widget? artifacts;
  final Widget? agent;
  final Widget? settings;
  final OtoConsoleSection initialSection;
  final OtoConsoleConfig? config;
  final OtoConsoleThemeAdapter? themeAdapter;
  final OtoConsoleNavigationCallback? onNavigate;
  final OtoCapabilityPack? capabilities;

  const OtoConsoleShell({
    super.key,
    required this.overview,
    this.runners,
    this.pipelines,
    this.executions,
    this.artifacts,
    this.agent,
    this.settings,
    this.initialSection = OtoConsoleSection.overview,
    this.config,
    this.themeAdapter,
    this.onNavigate,
    this.capabilities,
  });

  @override
  State<OtoConsoleShell> createState() => _OtoConsoleShellState();
}

class _OtoConsoleShellState extends State<OtoConsoleShell> {
  late OtoConsoleSection _section = widget.initialSection;

  @override
  void didUpdateWidget(covariant OtoConsoleShell oldWidget) {
    super.didUpdateWidget(oldWidget);
    if (oldWidget.initialSection != widget.initialSection) {
      _section = widget.initialSection;
    }
  }

  @override
  Widget build(BuildContext context) {
    final theme = widget.themeAdapter ?? const OtoConsoleThemeAdapter();
    final descriptor = _SectionDescriptor.forSection(_section);
    return Scaffold(
      backgroundColor: theme.backgroundColor,
      body: SafeArea(
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.stretch,
          children: [
            _OtoConsoleRail(
              selected: _section,
              onSelect: _select,
              theme: theme,
            ),
            Expanded(
              child: _ConsolePageFrame(
                descriptor: descriptor,
                theme: theme,
                child: _buildContent(theme),
              ),
            ),
          ],
        ),
      ),
    );
  }

  void _select(OtoConsoleSection section) {
    setState(() {
      _section = section;
    });
    widget.onNavigate?.call(section);
  }

  Widget _buildContent(OtoConsoleThemeAdapter theme) {
    return switch (_section) {
      OtoConsoleSection.overview => widget.overview,
      OtoConsoleSection.runners =>
        widget.runners ??
            OtoConsoleSectionSurface(
              icon: Icons.precision_manufacturing_outlined,
              title: 'Runners',
              emptyTitle: 'No runners connected',
              emptyMessage: 'Runner registry is empty.',
              theme: theme,
            ),
      OtoConsoleSection.pipelines =>
        widget.pipelines ??
            OtoConsoleSectionSurface(
              icon: Icons.account_tree_outlined,
              title: 'Pipelines / Jobs',
              emptyTitle: 'No pipeline jobs',
              emptyMessage: 'Job queue is empty.',
              theme: theme,
            ),
      OtoConsoleSection.executions =>
        widget.executions ??
            OtoConsoleSectionSurface(
              icon: Icons.play_circle_outline,
              title: 'Executions',
              emptyTitle: 'No executions',
              emptyMessage: 'Execution history is empty.',
              theme: theme,
            ),
      OtoConsoleSection.artifacts =>
        widget.artifacts ??
            OtoConsoleSectionSurface(
              icon: Icons.inventory_2_outlined,
              title: 'Artifacts',
              emptyTitle: 'No artifacts',
              emptyMessage: 'Artifact events are empty.',
              theme: theme,
            ),
      OtoConsoleSection.agent =>
        widget.agent ?? OtoAgentPanel(capabilities: widget.capabilities),
      OtoConsoleSection.settings =>
        widget.settings ??
            OtoConsoleSectionSurface(
              icon: Icons.tune,
              title: 'Settings',
              emptyTitle: 'No local preferences',
              emptyMessage: 'Settings are using runtime defaults.',
              detailGroups: [
                OtoConsoleSectionDetailGroup(
                  title: 'Runtime endpoints',
                  details: [
                    if (widget.config != null)
                      OtoConsoleSectionDetail(
                        label: 'HTTP API',
                        value: widget.config!.serverHttpUrl,
                      ),
                    if (widget.config != null)
                      OtoConsoleSectionDetail(
                        label: 'Wire URL',
                        value: widget.config!.serverWireUrl,
                      ),
                  ],
                ),
                const OtoConsoleSectionDetailGroup(
                  title: 'Browser policy',
                  details: [
                    OtoConsoleSectionDetail(
                      label: 'Browser API policy',
                      value: 'CORS headers or a same-origin proxy are required.',
                    ),
                  ],
                ),
              ],
              theme: theme,
            ),
    };
  }
}

class _SectionDescriptor {
  final OtoConsoleSection section;
  final String label;
  final String group;

  const _SectionDescriptor({
    required this.section,
    required this.label,
    required this.group,
  });

  static _SectionDescriptor forSection(OtoConsoleSection section) {
    return switch (section) {
      OtoConsoleSection.overview => _SectionDescriptor(
          section: section,
          label: 'Overview',
          group: 'overview',
        ),
      OtoConsoleSection.pipelines || OtoConsoleSection.executions =>
        _SectionDescriptor(
          section: section,
          label: section == OtoConsoleSection.pipelines
              ? 'Pipelines'
              : 'Executions',
          group: 'workflow',
        ),
      OtoConsoleSection.runners || OtoConsoleSection.artifacts =>
        _SectionDescriptor(
          section: section,
          label: section == OtoConsoleSection.runners
              ? 'Runners'
              : 'Artifacts',
          group: 'operations',
        ),
      OtoConsoleSection.agent => _SectionDescriptor(
          section: section,
          label: 'Agent',
          group: 'admin',
        ),
      OtoConsoleSection.settings => _SectionDescriptor(
          section: section,
          label: 'Settings',
          group: 'admin',
        ),
    };
  }
}

class _ConsolePageFrame extends StatelessWidget {
  final _SectionDescriptor descriptor;
  final OtoConsoleThemeAdapter theme;
  final Widget child;

  const _ConsolePageFrame({
    required this.descriptor,
    required this.theme,
    required this.child,
  });

  @override
  Widget build(BuildContext context) {
    return Column(
      crossAxisAlignment: CrossAxisAlignment.stretch,
      children: [
        _PageHeader(descriptor: descriptor, theme: theme),
        Expanded(child: child),
      ],
    );
  }
}

class _PageHeader extends StatelessWidget {
  final _SectionDescriptor descriptor;
  final OtoConsoleThemeAdapter theme;

  const _PageHeader({
    required this.descriptor,
    required this.theme,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.symmetric(horizontal: 24, vertical: 16),
      color: theme.railBackgroundColor,
      child: Row(
        children: [
          Icon(descriptor.section == OtoConsoleSection.overview
              ? Icons.dashboard_outlined
              : descriptor.section == OtoConsoleSection.runners
                  ? Icons.precision_manufacturing_outlined
                  : descriptor.section == OtoConsoleSection.pipelines
                      ? Icons.account_tree_outlined
                      : descriptor.section == OtoConsoleSection.executions
                          ? Icons.play_circle_outline
                          : descriptor.section == OtoConsoleSection.artifacts
                              ? Icons.inventory_2_outlined
                              : descriptor.section == OtoConsoleSection.agent
                                  ? Icons.smart_toy_outlined
                                  : Icons.tune,
            color: theme.primaryColor,
            size: 20,
          ),
          const SizedBox(width: 8),
          Text(
            descriptor.label,
            style: TextStyle(
              color: theme.textColor,
              fontSize: 16,
              fontWeight: FontWeight.w800,
            ),
          ),
        ],
      ),
    );
  }
}

class _RailDivider extends StatelessWidget {
  const _RailDivider();

  @override
  Widget build(BuildContext context) {
    return Padding(
      padding: const EdgeInsets.symmetric(horizontal: 8),
      child: Container(
        height: 1,
        color: Colors.white38,
      ),
    );
  }
}

class _OtoConsoleRail extends StatelessWidget {
  final OtoConsoleSection selected;
  final ValueChanged<OtoConsoleSection> onSelect;
  final OtoConsoleThemeAdapter theme;

  const _OtoConsoleRail({
    required this.selected,
    required this.onSelect,
    required this.theme,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      width: 60,
      decoration: BoxDecoration(
        color: theme.railBackgroundColor,
        border: Border(right: BorderSide(color: theme.borderColor)),
      ),
      child: Column(
        children: [
          const SizedBox(height: 8),
          _RailButton(
            tooltip: 'Overview',
            icon: Icons.dashboard_outlined,
            selected: selected == OtoConsoleSection.overview,
            onPressed: () => onSelect(OtoConsoleSection.overview),
            theme: theme,
          ),
          const _RailDivider(),
          _RailButton(
            tooltip: 'Pipelines',
            icon: Icons.account_tree_outlined,
            selected: selected == OtoConsoleSection.pipelines,
            onPressed: () => onSelect(OtoConsoleSection.pipelines),
            theme: theme,
          ),
          _RailButton(
            tooltip: 'Executions',
            icon: Icons.play_circle_outline,
            selected: selected == OtoConsoleSection.executions,
            onPressed: () => onSelect(OtoConsoleSection.executions),
            theme: theme,
          ),
          const _RailDivider(),
          _RailButton(
            tooltip: 'Runners',
            icon: Icons.precision_manufacturing_outlined,
            selected: selected == OtoConsoleSection.runners,
            onPressed: () => onSelect(OtoConsoleSection.runners),
            theme: theme,
          ),
          _RailButton(
            tooltip: 'Artifacts',
            icon: Icons.inventory_2_outlined,
            selected: selected == OtoConsoleSection.artifacts,
            onPressed: () => onSelect(OtoConsoleSection.artifacts),
            theme: theme,
          ),
          const Spacer(),
          _RailButton(
            tooltip: 'Settings',
            icon: Icons.tune,
            selected: selected == OtoConsoleSection.settings,
            onPressed: () => onSelect(OtoConsoleSection.settings),
            theme: theme,
          ),
          _RailButton(
            tooltip: 'Agent',
            icon: Icons.smart_toy_outlined,
            selected: selected == OtoConsoleSection.agent,
            onPressed: () => onSelect(OtoConsoleSection.agent),
            theme: theme,
          ),
          const SizedBox(height: 8),
        ],
      ),
    );
  }
}

class _RailButton extends StatelessWidget {
  final String tooltip;
  final IconData icon;
  final bool selected;
  final VoidCallback onPressed;
  final OtoConsoleThemeAdapter theme;

  const _RailButton({
    required this.tooltip,
    required this.icon,
    required this.selected,
    required this.onPressed,
    required this.theme,
  });

  @override
  Widget build(BuildContext context) {
    final color = selected ? theme.primaryColor : theme.textSecondaryColor;
    return Tooltip(
      message: tooltip,
      waitDuration: const Duration(milliseconds: 500),
      child: SizedBox(
        width: 56,
        height: 48,
        child: IconButton(
          onPressed: onPressed,
          icon: Icon(icon, color: color),
          style: IconButton.styleFrom(
            backgroundColor: selected
                ? theme.primaryColor.withValues(alpha: 0.1)
                : Colors.transparent,
            shape: RoundedRectangleBorder(
              borderRadius: BorderRadius.circular(8),
            ),
          ),
        ),
      ),
    );
  }
}

class OtoConsoleSectionDetail {
  final String label;
  final String value;

  const OtoConsoleSectionDetail({required this.label, required this.value});
}

class OtoConsoleSectionDetailGroup {
  final String title;
  final List<OtoConsoleSectionDetail> details;

  const OtoConsoleSectionDetailGroup({
    required this.title,
    required this.details,
  });
}

class OtoConsoleSectionSurface extends StatelessWidget {
  final IconData icon;
  final String title;
  final String emptyTitle;
  final String emptyMessage;
  final OtoConsoleThemeAdapter theme;
  final List<OtoConsoleSectionDetail> details;
  final List<OtoConsoleSectionDetailGroup> detailGroups;

  const OtoConsoleSectionSurface({
    super.key,
    required this.icon,
    required this.title,
    required this.emptyTitle,
    required this.emptyMessage,
    required this.theme,
    this.details = const [],
    this.detailGroups = const [],
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      color: theme.backgroundColor,
      child: Padding(
        padding: const EdgeInsets.all(24),
        child: Center(
          child: ConstrainedBox(
            constraints: const BoxConstraints(maxWidth: 820),
            child: ListView(
              shrinkWrap: true,
              children: [
                Row(
                  children: [
                    Icon(icon, color: theme.primaryColor, size: 24),
                    const SizedBox(width: 12),
                    Expanded(
                      child: Text(
                        title,
                        overflow: TextOverflow.ellipsis,
                        style: TextStyle(
                          color: theme.textColor,
                          fontSize: 24,
                          fontWeight: FontWeight.w800,
                        ),
                      ),
                    ),
                  ],
                ),
                const SizedBox(height: 20),
                _EmptyStatePanel(
                  icon: icon,
                  title: emptyTitle,
                  message: emptyMessage,
                  theme: theme,
                ),
                if (detailGroups.isNotEmpty) ...[
                  for (final group in detailGroups) ...[
                    const SizedBox(height: 20),
                    Text(
                      group.title,
                      style: TextStyle(
                        color: theme.textSecondaryColor,
                        fontSize: 12,
                        fontWeight: FontWeight.bold,
                      ),
                    ),
                    const SizedBox(height: 10),
                    for (final detail in group.details) ...[
                      _SectionDetailTile(detail: detail, theme: theme),
                      const SizedBox(height: 10),
                    ],
                  ],
                ] else if (details.isNotEmpty) ...[
                  const SizedBox(height: 20),
                  for (final detail in details) ...[
                    _SectionDetailTile(detail: detail, theme: theme),
                    const SizedBox(height: 10),
                  ],
                ],
              ],
            ),
          ),
        ),
      ),
    );
  }
}

class _EmptyStatePanel extends StatelessWidget {
  final IconData icon;
  final String title;
  final String message;
  final OtoConsoleThemeAdapter theme;

  const _EmptyStatePanel({
    required this.icon,
    required this.title,
    required this.message,
    required this.theme,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(20),
      decoration: BoxDecoration(
        color: theme.railBackgroundColor,
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: theme.borderColor),
      ),
      child: Row(
        children: [
          Icon(icon, color: theme.primaryColor, size: 32),
          const SizedBox(width: 16),
          Expanded(
            child: Column(
              crossAxisAlignment: CrossAxisAlignment.start,
              children: [
                Text(
                  title,
                  style: TextStyle(
                    color: theme.textColor,
                    fontSize: 18,
                    fontWeight: FontWeight.w800,
                  ),
                ),
                const SizedBox(height: 4),
                Text(
                  message,
                  overflow: TextOverflow.ellipsis,
                  maxLines: 2,
                  style: TextStyle(color: theme.textSecondaryColor),
                ),
              ],
            ),
          ),
        ],
      ),
    );
  }
}

class _SectionDetailTile extends StatelessWidget {
  final OtoConsoleSectionDetail detail;
  final OtoConsoleThemeAdapter theme;

  const _SectionDetailTile({required this.detail, required this.theme});

  @override
  Widget build(BuildContext context) {
    return Container(
      padding: const EdgeInsets.all(16),
      decoration: BoxDecoration(
        color: theme.primaryColor.withValues(alpha: 0.06),
        borderRadius: BorderRadius.circular(8),
        border: Border.all(color: theme.primaryColor.withValues(alpha: 0.18)),
      ),
      child: Row(
        children: [
          SizedBox(
            width: 150,
            child: Text(
              detail.label,
              overflow: TextOverflow.ellipsis,
              style: TextStyle(
                color: theme.textSecondaryColor,
                fontSize: 12,
                fontWeight: FontWeight.w800,
              ),
            ),
          ),
          const SizedBox(width: 12),
          Expanded(
            child: Text(
              detail.value,
              overflow: TextOverflow.ellipsis,
              maxLines: 1,
              style: TextStyle(color: theme.textColor),
            ),
          ),
        ],
      ),
    );
  }
}