1package main
 2
 3import (
 4	"errors"
 5	"fmt"
 6	"net/http"
 7	"time"
 8
 9	"github.com/gin-gonic/gin"
10)
11
12func validateDate(month, day int) error {
13	if month < 1 || month > 12 {
14		return errors.New("invalid month: must be between 1 and 12")
15	}
16
17	if day < 1 || day > 31 {
18		return errors.New("invalid day: must be between 1 and 31")
19	}
20
21	// Construct a date and use time package to validate
22	dateStr := fmt.Sprintf("2023-%02d-%02d", month, day)
23	_, err := time.Parse("2006-01-02", dateStr)
24	if err != nil {
25		return errors.New("invalid day for the given month")
26	}
27
28	return nil
29}
30
31func updateOccurrence(c *gin.Context, input Occurrence) {
32	var occurrence Occurrence
33	if err := db.First(&occurrence, input.ID).Error; err != nil {
34		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
35		return
36	}
37
38	// Update existing record with new values
39	if input.Day != 0 || input.Month != 0 {
40		if err := validateDate(input.Month, input.Day); err != nil {
41			c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
42			return
43		}
44		occurrence.Month = input.Month
45		occurrence.Day = input.Day
46	}
47	if input.Name != "" {
48		occurrence.Name = input.Name
49	}
50	if input.Description != "" {
51		occurrence.Description = input.Description
52	}
53	occurrence.Notify = input.Notify
54	occurrence.Notified = input.Notified
55	db.Save(&occurrence)
56	c.JSON(http.StatusOK, occurrence)
57}
58
59func addOccurrence(c *gin.Context) {
60	var input Occurrence
61	if err := c.ShouldBindJSON(&input); err != nil {
62		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
63		return
64	}
65
66	if input.ID != 0 {
67		updateOccurrence(c, input)
68		return
69	}
70
71	if err := validateDate(input.Month, input.Day); err != nil {
72		c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
73		return
74	}
75
76	db.Create(&input)
77	c.JSON(http.StatusOK, input)
78}
79
80func getOccurrences(c *gin.Context) {
81	var occurrences []Occurrence
82	db.Find(&occurrences)
83	c.JSON(http.StatusOK, occurrences)
84}
85
86func deleteOccurrence(c *gin.Context) {
87	id := c.Param("id")
88	var occurrence Occurrence
89
90	if err := db.First(&occurrence, id).Error; err != nil {
91		c.JSON(http.StatusNotFound, gin.H{"error": "Occurrence not found"})
92		return
93	}
94
95	db.Delete(&occurrence)
96	c.JSON(http.StatusOK, gin.H{"message": "Occurrence deleted"})
97}