case版本

internal/handler/floor_handler.go

@@ -9,6 +9,8 @@ import (
 	"net/http"
 	"os"
 	"path/filepath"
+	"regexp"
+	"strconv"
 	"strings"
 	"time"
 
@@ -50,8 +52,8 @@ type RoomOption struct {
 var woodPatterns = []PatternOption{
 	{Code: 1, Name: "直铺（工字拼）Straight Lay", Category: "wood", Pattern: "planks running from bottom-left toward top-right of the image, joints staggered randomly, at least 6 inch offset between rows"},
 	{Code: 2, Name: "横铺 Horizontal Lay", Category: "wood", Pattern: "planks running horizontally left to right, parallel to the bottom edge of the image, joints staggered randomly, at least 6 inch offset"},
-	{Code: 3, Name: "人字铺 Herringbone", Category: "wood", Pattern: "ALL planks must be IDENTICAL width - no piece may appear narrower. Planks at 90 degrees forming continuous zigzag V-lines from bottom-left to top-right of the image. At far distance, planks remain distinct with visible seams - NOT merging into a solid mass."},
-	{Code: 4, Name: "鱼骨铺 Chevron", Category: "wood", Pattern: "planks with 45 degree mitered ends forming continuous V-points aligned from bottom-left to top-right of the image"},
+	{Code: 3, Name: "人字拼 Herringbone", Category: "wood", Pattern: "ALL planks must be IDENTICAL width - no piece may appear narrower. Planks at 90° forming continuous zigzag V-lines from bottom-left to top-right of the image. At far distance, planks remain distinct with visible seams - NOT merging into a solid mass."},
+	{Code: 4, Name: "鱼骨拼 Chevron", Category: "wood", Pattern: "planks with 45° mitered ends forming continuous V-points aligned from bottom-left to top-right of the image"},
 }
 
 var tilePatterns = []PatternOption{
@@ -59,7 +61,7 @@ var tilePatterns = []PatternOption{
 	{Code: 6, Name: "工字铺（1/2错缝）Running Bond", Category: "tile", Pattern: "rows parallel to bottom edge of image, each row offset 50% from previous, horizontal grout lines continuous, vertical grout lines staggered"},
 	{Code: 7, Name: "三七错铺 1/3 Offset", Category: "tile", Pattern: "rows parallel to bottom edge of image, each row offset exactly 33% of tile length, every third row aligns"},
 	{Code: 8, Name: "六边形 Hexagonal", Category: "tile", Pattern: "six-sided tiles interlocked in honeycomb mesh, flat edges horizontal (parallel to bottom edge of image), grout follows hexagonal edges"},
-	{Code: 9, Name: "斜铺（60度对角）Diagonal", Category: "tile", Pattern: "tiles rotated 60 degrees to the image frame, grout lines run diagonally at 60 and 150 degrees to the bottom edge, no lines parallel to image edges"},
+	{Code: 9, Name: "斜铺（60度对角）Diagonal", Category: "tile", Pattern: "tiles rotated 60° to the image frame, grout lines run diagonally at 60 and 150 degrees to the bottom edge, no lines parallel to image edges"},
 }
 
 var roomOptions = []RoomOption{
@@ -522,8 +524,8 @@ func buildCompactFloorPrompt(floor FloorOption, pattern PatternOption, room *Roo
 	if floor.FloorDescription != "" {
 		details = append(details, "目录材质描述："+floor.FloorDescription)
 	}
-	if floor.SizeLabel != "" || (floor.WidthIn > 0 && floor.LengthIn > 0) {
-		details = append(details, compactSizeInstruction(floor))
+	if sizeRule := compactSizeInstruction(floor, pattern); sizeRule != "" {
+		details = append(details, sizeRule)
 	}
 	if floor.ImageURL != "" {
 		details = append(details, "产品图是唯一材质参考：锁定基础颜色、纹理、纹路、光泽、材质类型；不要重新美化或改色。")
@@ -544,14 +546,85 @@ func buildCompactFloorPrompt(floor FloorOption, pattern PatternOption, room *Roo
 	)
 }
 
-func compactSizeInstruction(floor FloorOption) string {
+func compactSizeInstruction(floor FloorOption, pattern PatternOption) string {
+	width, length, ok := floorDimensions(floor)
+	if !ok {
+		if pattern.Code == 8 {
+			return "尺寸规则：这是特殊形状砖，按产品图保持真实特殊形状和缝隙结构；不要改成方砖或普通长方形砖。"
+		}
 		if floor.SizeLabel != "" {
 			return "尺寸规则：使用所选尺寸 " + floor.SizeLabel + "；只调整板/砖大小和缝距，不改变材质颜色和纹理。"
 		}
-	if floor.WidthIn > 0 && floor.LengthIn > 0 {
-		return fmt.Sprintf("尺寸规则：每片 %.1f\" x %.1f\"；只调整板/砖大小和缝距，不改变材质颜色和纹理。", floor.WidthIn, floor.LengthIn)
-	}
 		return ""
+	}
+
+	shortSide, longSide := width, length
+	if shortSide > longSide {
+		shortSide, longSide = longSide, shortSide
+	}
+	ratio := longSide / shortSide
+	sizeText := formatDimensionPair(width, length)
+
+	if ratio <= 1.08 {
+		return fmt.Sprintf("尺寸规则：每块砖必须是 %s 正方形，真实长宽比 %s。砖缝网格应形成接近 1:1 的方砖；只调整板/砖大小和缝距，不改变材质颜色和纹理。", sizeText, aspectRatioText(shortSide, longSide))
+	}
+
+	return fmt.Sprintf("尺寸规则：每块砖必须是 %s 长方形，真实长宽比 %s。近处可见的完整砖块也必须明显是长方形，长边约为短边的 %.2g 倍，不得变成接近正方形；砖缝网格必须形成同样比例的长方形砖块。只调整板/砖大小和缝距，不改变材质颜色和纹理。", sizeText, aspectRatioText(shortSide, longSide), ratio)
+}
+
+func floorDimensions(floor FloorOption) (float64, float64, bool) {
+	if floor.WidthIn > 0 && floor.LengthIn > 0 {
+		return floor.WidthIn, floor.LengthIn, true
+	}
+
+	text := strings.Join([]string{floor.SizeLabel, floor.Name}, " ")
+	re := regexp.MustCompile(`(?i)(\d+(?:\.\d+)?)\s*(?:x|×|-|by)\s*(\d+(?:\.\d+)?)`)
+	match := re.FindStringSubmatch(text)
+	if len(match) != 3 {
+		return 0, 0, false
+	}
+	width, err1 := strconv.ParseFloat(match[1], 64)
+	length, err2 := strconv.ParseFloat(match[2], 64)
+	if err1 != nil || err2 != nil || width <= 0 || length <= 0 {
+		return 0, 0, false
+	}
+	return width, length, true
+}
+
+func formatDimensionPair(width, length float64) string {
+	return fmt.Sprintf("%s x %s 英寸", formatDimension(width), formatDimension(length))
+}
+
+func formatDimension(v float64) string {
+	if v == float64(int(v)) {
+		return fmt.Sprintf("%d", int(v))
+	}
+	return fmt.Sprintf("%.1f", v)
+}
+
+func aspectRatioText(shortSide, longSide float64) string {
+	ratio := longSide / shortSide
+	bestNumer, bestDenom := 1, 1
+	bestErr := ratio - 1
+	if bestErr < 0 {
+		bestErr = -bestErr
+	}
+	for denom := 1; denom <= 12; denom++ {
+		numer := int(ratio*float64(denom) + 0.5)
+		if numer < 1 {
+			numer = 1
+		}
+		err := ratio - float64(numer)/float64(denom)
+		if err < 0 {
+			err = -err
+		}
+		if err < bestErr {
+			bestErr = err
+			bestNumer = numer
+			bestDenom = denom
+		}
+	}
+	return fmt.Sprintf("%d:%d", bestDenom, bestNumer)
 }
 
 func compactProductNameGuard(floor FloorOption) string {