import 'package:flutter/material.dart';

import '../../../domain/entities/wall_config.dart';
import '../../blocs/wall/wall_state.dart';

/// Overview screen showing all wall sections in spatial layout (matching D6)
class WallOverview extends StatelessWidget {
  final WallConfig config;
  final WallState wallState;
  final Function(String sectionId) onSectionTap;

  const WallOverview({
    super.key,
    required this.config,
    required this.wallState,
    required this.onSectionTap,
  });

  @override
  Widget build(BuildContext context) {
    return Container(
      color: const Color(0xFF5A5A5A), // D6 background color
      child: LayoutBuilder(
        builder: (context, constraints) {
          return Stack(
            children: _buildSpatialLayout(constraints),
          );
        },
      ),
    );
  }

  List<Widget> _buildSpatialLayout(BoxConstraints constraints) {
    final widgets = <Widget>[];
    final width = constraints.maxWidth;
    final height = constraints.maxHeight;

    // Position sections based on D6 layout
    // The D6 app shows:
    // - "4. Vrchní část" (top) at the top center
    // - "1. Levá část" (left), "2. Střed stěny" (center), "3. Pravá část" (right) in middle row
    // - "5. Stupínek" (bottom) at the bottom center

    for (final section in config.sections) {
      final position = _getSectionPosition(section.id, width, height);
      final size = _getSectionSize(section.id, width, height);

      widgets.add(
        Positioned(
          left: position.dx,
          top: position.dy,
          width: size.width,
          height: size.height,
          child: _SectionTile(
            section: section,
            wallState: wallState,
            onTap: () => onSectionTap(section.id),
          ),
        ),
      );
    }

    return widgets;
  }

  Offset _getSectionPosition(String sectionId, double width, double height) {
    // Layout matching D6 screenshot
    switch (sectionId) {
      case 'top': // 4. Vrchní část - top center
        return Offset(width * 0.35, height * 0.05);
      case 'left': // 1. Levá část - middle left
        return Offset(width * 0.08, height * 0.35);
      case 'center': // 2. Střed stěny - middle center
        return Offset(width * 0.33, height * 0.35);
      case 'right': // 3. Pravá část - middle right
        return Offset(width * 0.58, height * 0.35);
      case 'bottom': // 5. Stupínek - bottom center
        return Offset(width * 0.33, height * 0.68);
      default:
        return Offset.zero;
    }
  }

  Size _getSectionSize(String sectionId, double width, double height) {
    // Sizes proportional to D6 layout
    switch (sectionId) {
      case 'top':
        return Size(width * 0.30, height * 0.22);
      case 'left':
        return Size(width * 0.22, height * 0.25);
      case 'center':
        return Size(width * 0.22, height * 0.25);
      case 'right':
        return Size(width * 0.22, height * 0.25);
      case 'bottom':
        return Size(width * 0.30, height * 0.25);
      default:
        return Size(width * 0.2, height * 0.2);
    }
  }
}

class _SectionTile extends StatelessWidget {
  final WallSection section;
  final WallState wallState;
  final VoidCallback onTap;

  const _SectionTile({
    required this.section,
    required this.wallState,
    required this.onTap,
  });

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: onTap,
      child: Column(
        crossAxisAlignment: CrossAxisAlignment.start,
        children: [
          // Section label
          Padding(
            padding: const EdgeInsets.only(bottom: 4),
            child: Text(
              '${_getSectionNumber(section.id)}. ${section.name}',
              style: const TextStyle(
                color: Colors.white,
                fontSize: 12,
                fontWeight: FontWeight.w500,
              ),
            ),
          ),
          // Mini monitors grid
          Expanded(
            child: _MiniMonitorsGrid(
              section: section,
              wallState: wallState,
            ),
          ),
        ],
      ),
    );
  }

  int _getSectionNumber(String id) {
    switch (id) {
      case 'left': return 1;
      case 'center': return 2;
      case 'right': return 3;
      case 'top': return 4;
      case 'bottom': return 5;
      default: return 0;
    }
  }
}

class _MiniMonitorsGrid extends StatelessWidget {
  final WallSection section;
  final WallState wallState;

  const _MiniMonitorsGrid({
    required this.section,
    required this.wallState,
  });

  @override
  Widget build(BuildContext context) {
    return LayoutBuilder(
      builder: (context, constraints) {
        final monitors = section.monitors;
        final gridCols = section.columns;
        final gridRows = section.rows;

        // Calculate cell dimensions based on grid size
        final cellWidth = constraints.maxWidth / gridCols;
        final cellHeight = constraints.maxHeight / gridRows;

        // Position monitors using their explicit row/col values (matching detail view)
        return Stack(
          children: monitors.map((monitor) {
            // Convert 1-based row/col to 0-based for positioning
            final row = monitor.row - 1;
            final col = monitor.col - 1;

            return Positioned(
              left: col * cellWidth,
              top: row * cellHeight,
              width: monitor.colSpan * cellWidth,
              height: monitor.rowSpan * cellHeight,
              child: _MiniPhysicalMonitor(
                monitor: monitor,
                wallState: wallState,
              ),
            );
          }).toList(),
        );
      },
    );
  }
}

class _MiniPhysicalMonitor extends StatelessWidget {
  final PhysicalMonitor monitor;
  final WallState wallState;

  const _MiniPhysicalMonitor({
    required this.monitor,
    required this.wallState,
  });

  @override
  Widget build(BuildContext context) {
    final viewers = monitor.viewerIds;
    final gridCols = monitor.colSpan;
    final gridRows = monitor.rowSpan;

    // Overview: no cyan borders, just dark grid lines between viewers
    return Container(
      color: const Color(0xFF4A4A4A), // Dark background shows as grid lines
      child: Column(
        children: List.generate(gridRows, (row) {
          return Expanded(
            child: Row(
              children: List.generate(gridCols, (col) {
                final index = row * gridCols + col;
                if (index >= viewers.length) {
                  return Expanded(
                    child: Padding(
                      padding: const EdgeInsets.all(0.5),
                      child: Container(
                        color: const Color(0xFF6A6A6A),
                      ),
                    ),
                  );
                }
                final viewerId = viewers[index];
                final viewerState = wallState.getViewerState(viewerId);

                Color tileColor;
                if (viewerState.hasAlarm) {
                  tileColor = const Color(0xFFDC2626);
                } else {
                  tileColor = const Color(0xFF6A6A6A);
                }

                return Expanded(
                  child: Padding(
                    padding: const EdgeInsets.all(0.5),
                    child: Container(
                      color: tileColor,
                    ),
                  ),
                );
              }),
            ),
          );
        }),
      ),
    );
  }
}