using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading.Tasks;
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using WIDESEAWCS_DTO.PlacedBlockDTO;
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using WIDESEAWCS_IBasicInfoService;
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namespace WIDESEAWCS_BasicInfoService
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{
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public class PlaceBlockService
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{
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public const int SPACING = 5;
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/// <summary>
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/// 容器尺寸
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/// </summary>
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public ContainerSize ContainerSize { get; private set; }
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/// <summary>
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/// 已放置货物
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/// </summary>
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public List<PlacedBlock> PlacedBlocks { get; private set; }
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private readonly PlacedBlock containerFloor;
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public PlaceBlockService(ContainerSize containerSize, List<PlacedBlock>? placedBlocks = null)
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{
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containerSize.Length = containerSize.Length;
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containerSize.Width = containerSize.Width;
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ContainerSize = containerSize;
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if (placedBlocks == null || placedBlocks.Count == 0)
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{
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PlacedBlocks = new List<PlacedBlock>();
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}
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else
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{
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PlacedBlocks = placedBlocks;
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}
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containerFloor = new PlacedBlock(new Point3D(0, 0, 0), ContainerSize.Length, ContainerSize.Width, 0);
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}
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/// <summary>
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/// 主放置方法：尝试放置指定尺寸的货物
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/// </summary>
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/// <param name="length">货物长度（X轴方向）</param>
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/// <param name="width">货物宽度（Y轴方向）</param>
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/// <param name="height">货物高度（Z轴方向）</param>
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/// <returns>
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/// 成功：返回可放置位置的左下前角Point3D坐标
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/// 失败：返回null（尺寸无效或空间不足）
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/// </returns>
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public Point3D? PlaceBlock(int length, int width, int height)
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{
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if (!IsValidBlock(length, width, height))
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return null;
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return FindStackablePosition(length, width, height);
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}
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/// <summary>
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/// 验证货物尺寸有效性
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/// 校验规则：
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/// 1. 各维度尺寸必须大于等于50mm
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/// 2. 各维度尺寸不得超过容器对应维度（扣除间隔后）
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/// 3. 高度必须 <= 容器剩余高度
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/// </summary>
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/// <param name="l"></param>
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/// <param name="w"></param>
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/// <param name="h"></param>
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/// <returns></returns>
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private bool IsValidBlock(int l, int w, int h)
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{
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return l > 0 && w > 0 && h > 0 &&
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l <= ContainerSize.Length - 2 * SPACING &&
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w <= ContainerSize.Width - 2 * SPACING &&
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h < ContainerSize.Height;
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}
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/// <summary>
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/// 在现有货物顶部寻找叠放位置（堆叠模式）
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/// 叠放条件：
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/// - 支撑面积 >= 被支撑面面积的70%
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/// - 新货物完全位于支撑货物上方
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/// - 满足间隔要求
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/// </summary>
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/// <param name="l">长度</param>
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/// <param name="w">宽度</param>
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/// <param name="h">高度</param>
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/// <returns></returns>
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private Point3D? FindStackablePosition(int l, int w, int h)
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{
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// 生成候选支撑层（包含容器底部）
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var candidateLayers = PlacedBlocks
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.Select(b => b.Position.Z + b.Height)
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.Append(0)
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.Distinct()
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.OrderBy(z => z)
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.ToList();
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foreach (var baseZ in candidateLayers)
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{
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if (baseZ + h > ContainerSize.Height) continue;
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// 获取当前层的支撑块（包含虚拟容器底部）
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var supports = GetSupportBlocks(baseZ);
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foreach (var support in supports)
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{
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// 计算有效叠放区域（修正间隔逻辑）
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int xStart = support.Position.X;
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int yStart = support.Position.Y;
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// 容器底部支撑必须内缩间隔（即使尺寸相同）
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if (support == containerFloor)
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{
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xStart = support.Position.X;
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yStart = support.Position.Y;
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}
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int xEnd = support.Position.X + support.Length - l;
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int yEnd = support.Position.Y + support.Width - w;
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// 普通支撑块仅在尺寸不同时加间隔
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if (support != containerFloor &&
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(l != support.Length && w != support.Width))
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{
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xStart += SPACING;
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yStart += SPACING;
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xEnd -= SPACING;
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yEnd -= SPACING;
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}
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// 最终容器边界约束
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xEnd = Math.Min(xEnd, ContainerSize.Length - l - SPACING);
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yEnd = Math.Min(yEnd, ContainerSize.Width - w - SPACING);
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if (xStart > xEnd || yStart > yEnd) continue;
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// 优化搜索：优先角落位置
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for (int y = yStart; y <= yEnd; y += 10)
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{
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for (int x = xStart; x <= xEnd; x += 10)
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{
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var candidate = new Point3D(x, y, baseZ);
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if (IsPositionValid(candidate, l, w, h))
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{
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var placed = new PlacedBlock(candidate, l, w, h);
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//PlacedBlocks.Add(placed);
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return candidate;
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}
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}
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}
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}
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}
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return null;
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}
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/// <summary>
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/// 获取支撑当前货物的底层货物列表
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/// 特殊处理：当baseZ=0时返回虚拟容器底部作为支撑
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/// 支撑条件：货物底面与支撑货物顶面接触且Z坐标匹配
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/// </summary>
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/// <param name="baseZ">支撑块高度</param>
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/// <returns></returns>
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private IEnumerable<PlacedBlock> GetSupportBlocks(int baseZ)
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{
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var blocks = PlacedBlocks
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.Where(b => b.Position.Z + b.Height == baseZ)
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.OrderByDescending(b => b.Length * b.Width).ToList();
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// 当baseZ=0时添加容器底部支撑
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if (baseZ == 0 && blocks.Count == 0)
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{
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return new List<PlacedBlock> { containerFloor };
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}
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return blocks;
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}
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/// <summary>
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/// 验证指定位置是否合法
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/// 校验内容：
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/// 1. 边界条件：货物不得超出容器有效空间
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/// 2. 碰撞检测：与已放置货物无空间重叠
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/// 3. 间隔要求：保持最小间隔（SPACING常量）
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/// </summary>
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/// <param name="pos">坐标</param>
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/// <param name="l">长度</param>
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/// <param name="w">宽度</param>
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/// <param name="h">高度</param>
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/// <returns></returns>
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private bool IsPositionValid(Point3D pos, int l, int w, int h)
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{
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// 边界检查（含容器边缘间隔）
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if (pos.X < SPACING ||
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pos.Y < SPACING ||
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pos.X + l > ContainerSize.Length - SPACING ||
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pos.Y + w > ContainerSize.Width - SPACING)
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return false;
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// 三维碰撞检测
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var newBlock = new PlacedBlock(pos, l, w, h);
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return !PlacedBlocks.Any(existing =>
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{
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bool xOverlap = newBlock.Position.X < existing.Position.X + existing.Length + SPACING &&
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newBlock.Position.X + newBlock.Length + SPACING > existing.Position.X;
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bool yOverlap = newBlock.Position.Y < existing.Position.Y + existing.Width + SPACING &&
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newBlock.Position.Y + newBlock.Width + SPACING > existing.Position.Y;
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bool zOverlap = newBlock.Position.Z < existing.Position.Z + existing.Height &&
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newBlock.Position.Z + h > existing.Position.Z;
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return xOverlap && yOverlap && zOverlap;
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});
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}
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}
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}
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