feat: 优化目标任务生成逻辑，增加自定义重复规则支持

- 在GoalTaskService中添加对自定义重复规则的支持，允许用户指定生成任务的星期几。
- 增加日志记录，便于调试和监控任务生成过程。
- 确保生成的任务不会与现有任务冲突，提升任务管理的灵活性和准确性。

src/goals/goals.service.ts

@@ -33,6 +33,7 @@ export class GoalsService {
    */
   async createGoal(userId: string, createGoalDto: CreateGoalDto): Promise<Goal> {
     try {
+      this.logger.log(`createGoal: ${JSON.stringify(createGoalDto, null, 2)}`);
       // 验证自定义重复规则
       if (createGoalDto.repeatType === GoalRepeatType.CUSTOM && !createGoalDto.customRepeatRule) {
         throw new BadRequestException('自定义重复类型必须提供自定义重复规则');

src/goals/services/goal-task.service.ts

@@ -153,37 +153,54 @@ export class GoalTaskService {
     const generateUntil = today.add(4, 'week'); // 提前生成4周的任务
     const actualEndDate = endDate.isBefore(generateUntil) ? endDate : generateUntil;
 
-    let current = startDate.startOf('isoWeek');
+    // 检查是否有自定义重复规则指定星期几
+    const weekdays = goal.customRepeatRule?.weekdays;
     
-    while (current.isSameOrBefore(actualEndDate)) {
-      const weekStart = current.startOf('isoWeek');
-      const weekEnd = current.endOf('isoWeek');
+    if (weekdays && weekdays.length > 0) {
+      // 如果有指定星期几，按指定星期几生成任务
+      this.logger.log(`为目标 ${goal.title} 生成每周任务，指定星期几: ${weekdays}`);
       
-      // 检查是否已存在该周的任务
-      const existingTask = existingTasks.find(task => {
-        const taskWeekStart = dayjs(task.startDate).startOf('isoWeek');
-        return taskWeekStart.isSame(weekStart);
-      });
+      // 从今天开始生成，如果开始日期晚于今天则从开始日期开始
+      let current = startDate.isBefore(today) ? today : startDate;
       
-      if (!existingTask && weekStart.isSameOrAfter(startDate)) {
-        const taskTitle = `${goal.title} - 第${current.isoWeek()}周 (${weekStart.format('MM-DD')} 至 ${weekEnd.format('MM-DD')})`;
+      let generatedCount = 0;
 
-        await this.goalTaskModel.create({
-          goalId: goal.id,
-          userId: goal.userId,
-          title: taskTitle,
-          description: `每周目标：完成${goal.frequency}次`,
-          startDate: weekStart.toDate(),
-          endDate: weekEnd.toDate(),
-          targetCount: goal.frequency,
-          currentCount: 0,
-          status: TaskStatus.PENDING,
-        });
+      while (current.isSameOrBefore(actualEndDate)) {
+        const dayOfWeek = current.day(); // 0=周日, 6=周六
 
-        this.logger.log(`为目标 ${goal.title} 生成每周任务: ${taskTitle}`);
+        if (weekdays.includes(dayOfWeek)) {
+          const taskDate = current.format('YYYY-MM-DD');
+
+          // 检查是否已存在该日期的任务
+          const existingTask = existingTasks.find(task =>
+            dayjs(task.startDate).format('YYYY-MM-DD') === taskDate
+          );
+
+          if (!existingTask) {
+            const weekDayNames = ['周日', '周一', '周二', '周三', '周四', '周五', '周六'];
+            const taskTitle = `${goal.title} - ${current.format('YYYY年MM月DD日')} ${weekDayNames[dayOfWeek]}`;
+
+            await this.goalTaskModel.create({
+              goalId: goal.id,
+              userId: goal.userId,
+              title: taskTitle,
+              description: `每周目标：完成${goal.frequency}次`,
+              startDate: current.toDate(),
+              endDate: current.toDate(),
+              targetCount: goal.frequency,
+              currentCount: 0,
+              status: TaskStatus.PENDING,
+            });
+
+            generatedCount++;
+            this.logger.log(`为目标 ${goal.title} 生成每周任务: ${taskTitle}`);
+          }
+        }
+
+        current = current.add(1, 'day');
       }
       
-      current = current.add(1, 'week');
+      this.logger.log(`为目标 ${goal.title} 生成了 ${generatedCount} 个每周任务`);
     } 
   }