feat: add random wall brushing function (needs help with imports)

- Add random brushing algorithm structure
- Need assistance fixing import path error at app.go:9
- Function ready for review and guidance

Author: ZzCreative

app.go

@@ -6,6 +6,10 @@ import (
 	"encoding/json"
 	"fmt"
 	"io"
+<<<<<<< HEAD
+	"math/rand" 
+=======
+>>>>>>> 455abfa291290798fb93a0f80cec2d4013175c15
 	"net/http"
 	"os"
 	"os/exec"
@@ -48,6 +52,28 @@ type ContributionDay struct {
 	Count int    `json:"count"`
 }
 
+<<<<<<< HEAD
+// RandomPaintRequest 随机刷墙请求参数
+type RandomPaintRequest struct {
+    StartDate      string  `json:"startDate"`      // 格式: "2024-01-01"
+    EndDate        string  `json:"endDate"`        // 格式: "2024-12-31"
+    Density        float64 `json:"density"`        // 0.0-1.0，活跃天数比例
+    MinPerDay      int     `json:"minPerDay"`      // 每天最少提交数
+    MaxPerDay      int     `json:"maxPerDay"`      // 每天最多提交数
+    ExcludeWeekend bool    `json:"excludeWeekend"` // 是否排除周末
+    RandomSeed     int64   `json:"randomSeed"`     // 随机种子，0表示使用时间戳
+}
+
+// RandomPaintResponse 随机刷墙响应
+type RandomPaintResponse struct {
+    Contributions []ContributionDay `json:"contributions"`
+    TotalDays     int               `json:"totalDays"`    // 总天数
+    ActiveDays    int               `json:"activeDays"`   // 活跃天数
+    TotalCommits  int               `json:"totalCommits"` // 总提交数
+}
+
+=======
+>>>>>>> 455abfa291290798fb93a0f80cec2d4013175c15
 type GenerateRepoRequest struct {
 	Year           int                `json:"year"`
 	GithubUsername string             `json:"githubUsername"`
@@ -477,6 +503,108 @@ func (a *App) ImportContributions() (*ImportContributionsResponse, error) {
 	return &ImportContributionsResponse{Contributions: contributions}, nil
 }
 
+<<<<<<< HEAD
+// GenerateRandomContributions 生成随机贡献数据
+func (a *App) GenerateRandomContributions(req RandomPaintRequest) (*RandomPaintResponse, error) {
+    // 参数验证
+    startDate, err := time.Parse("2006-01-02", req.StartDate)
+    if err != nil {
+        return nil, fmt.Errorf("invalid start date: %w", err)
+    }
+    
+    endDate, err := time.Parse("2006-01-02", req.EndDate)
+    if err != nil {
+        return nil, fmt.Errorf("invalid end date: %w", err)
+    }
+    
+    if startDate.After(endDate) {
+        return nil, fmt.Errorf("start date must be before end date")
+    }
+    
+    if req.Density < 0 || req.Density > 1 {
+        return nil, fmt.Errorf("density must be between 0 and 1")
+    }
+    
+    if req.MinPerDay < 0 {
+        return nil, fmt.Errorf("minPerDay must be positive")
+    }
+    
+    if req.MaxPerDay < req.MinPerDay {
+        return nil, fmt.Errorf("maxPerDay must be greater than or equal to minPerDay")
+    }
+    
+    // 初始化随机数生成器
+    var seed int64
+    if req.RandomSeed == 0 {
+        seed = time.Now().UnixNano()
+    } else {
+        seed = req.RandomSeed
+    }
+    rng := rand.New(rand.NewSource(seed))
+    
+    // 生成贡献数据
+    contributions := []ContributionDay{}
+    totalCommits := 0
+    activeDays := 0
+    
+    currentDate := startDate
+    for !currentDate.After(endDate) {
+        // 检查是否排除周末
+        if req.ExcludeWeekend {
+            weekday := currentDate.Weekday()
+            if weekday == time.Saturday || weekday == time.Sunday {
+                currentDate = currentDate.AddDate(0, 0, 1)
+                continue
+            }
+        }
+        
+        dateStr := currentDate.Format("2006-01-02")
+        
+        // 根据密度决定今天是否有贡献
+        if rng.Float64() <= req.Density {
+            // 生成当天的提交次数
+            var commitsToday int
+            if req.MaxPerDay == req.MinPerDay {
+                commitsToday = req.MinPerDay
+            } else {
+                commitsToday = req.MinPerDay + rng.Intn(req.MaxPerDay-req.MinPerDay+1)
+            }
+            
+            // 确保至少有一次提交
+            if commitsToday < 1 {
+                commitsToday = 1
+            }
+            
+            contributions = append(contributions, ContributionDay{
+                Date:  dateStr,
+                Count: commitsToday,
+            })
+            
+            totalCommits += commitsToday
+            activeDays++
+        }
+        
+        currentDate = currentDate.AddDate(0, 0, 1)
+    }
+    
+    // 按日期排序
+    sort.Slice(contributions, func(i, j int) bool {
+        return contributions[i].Date < contributions[j].Date
+    })
+    
+    // 计算总天数
+    totalDays := int(endDate.Sub(startDate).Hours()/24) + 1
+    
+    return &RandomPaintResponse{
+        Contributions: contributions,
+        TotalDays:     totalDays,
+        ActiveDays:    activeDays,
+        TotalCommits:  totalCommits,
+    }, nil
+}
+
+=======
+>>>>>>> 455abfa291290798fb93a0f80cec2d4013175c15
 func sanitiseRepoName(input string) string {
 	input = strings.TrimSpace(input)
 	if input == "" {