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package handlers
import (
"log"
"net/http"
"strconv"
"time"
"finance/backend/internal/database"
"finance/backend/internal/models"
"github.com/gin-gonic/gin"
)
// CreateGoalInput defines the structure for creating a new financial goal
type CreateGoalInput struct {
Name string `json:"name" binding:"required"`
TargetAmount int64 `json:"targetAmount" binding:"required"`
CurrentAmount int64 `json:"currentAmount"`
TargetDate string `json:"targetDate"` // YYYY-MM-DD format
Status string `json:"status"`
}
// UpdateGoalInput defines the structure for updating an existing financial goal
type UpdateGoalInput struct {
Name string `json:"name"`
TargetAmount int64 `json:"targetAmount"`
CurrentAmount int64 `json:"currentAmount"`
TargetDate string `json:"targetDate"` // YYYY-MM-DD format
Status string `json:"status"`
}
// UpdateGoalProgressInput defines the structure for updating just the progress of a goal
type UpdateGoalProgressInput struct {
CurrentAmount int64 `json:"currentAmount" binding:"required"`
}
// GoalHandler handles all goal-related operations in the API
type GoalHandler struct {
}
// NewGoalHandler creates and returns a new GoalHandler instance
func NewGoalHandler() *GoalHandler {
return &GoalHandler{}
}
// GetGoals retrieves all goals for the authenticated user
// Optionally filtered by status if provided as a query parameter
func (h *GoalHandler) GetGoals(c *gin.Context) {
userID := c.MustGet("userID").(uint)
var goals []models.Goal
query := database.DB.Where("user_id = ?", userID)
// Filter by status if provided
status := c.Query("status")
if status != "" {
query = query.Where("status = ?", status)
}
if err := query.Find(&goals).Error; err != nil {
log.Printf("Error fetching goals for user %d: %v", userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get goals"})
return
}
c.JSON(http.StatusOK, goals)
}
// GetGoal retrieves a specific goal by ID for the authenticated user
func (h *GoalHandler) GetGoal(c *gin.Context) {
userID := c.MustGet("userID").(uint)
goalID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
log.Printf("Error parsing goal ID: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid goal ID"})
return
}
var goal models.Goal
if err := database.DB.Where("id = ? AND user_id = ?", goalID, userID).First(&goal).Error; err != nil {
log.Printf("Error fetching goal ID %d for user %d: %v", goalID, userID, err)
c.JSON(http.StatusNotFound, gin.H{"error": "Goal not found"})
return
}
c.JSON(http.StatusOK, goal)
}
// CreateGoal creates a new financial goal for the authenticated user
func (h *GoalHandler) CreateGoal(c *gin.Context) {
userID := c.MustGet("userID").(uint)
var input CreateGoalInput
if err := c.ShouldBindJSON(&input); err != nil {
log.Printf("Error binding JSON for goal creation: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// Set default status if not provided
status := "Active"
if input.Status != "" {
status = input.Status
}
// Parse target date if provided
var targetDate time.Time
if input.TargetDate != "" {
parsedDate, err := time.Parse("2006-01-02", input.TargetDate)
if err != nil {
log.Printf("Error parsing target date for goal creation: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid date format for targetDate. Use YYYY-MM-DD"})
return
}
targetDate = parsedDate
}
goal := models.Goal{
UserID: userID,
Name: input.Name,
TargetAmount: input.TargetAmount,
CurrentAmount: input.CurrentAmount,
Status: status,
}
// Only set target date if it was provided
if !targetDate.IsZero() {
goal.TargetDate = targetDate
}
if err := database.DB.Create(&goal).Error; err != nil {
log.Printf("Error creating goal for user %d: %v", userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create goal"})
return
}
log.Printf("Goal created successfully for user %d: %s (ID: %d)", userID, goal.Name, goal.ID)
c.JSON(http.StatusCreated, goal)
}
// UpdateGoal updates an existing goal for the authenticated user
func (h *GoalHandler) UpdateGoal(c *gin.Context) {
userID := c.MustGet("userID").(uint)
goalID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
log.Printf("Error parsing goal ID for update: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid goal ID"})
return
}
var goal models.Goal
if err := database.DB.Where("id = ? AND user_id = ?", goalID, userID).First(&goal).Error; err != nil {
log.Printf("Error fetching goal ID %d for user %d in update: %v", goalID, userID, err)
c.JSON(http.StatusNotFound, gin.H{"error": "Goal not found"})
return
}
var input UpdateGoalInput
if err := c.ShouldBindJSON(&input); err != nil {
log.Printf("Error binding JSON for goal update: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// Update fields that were provided
if input.Name != "" {
goal.Name = input.Name
}
if input.TargetAmount != 0 {
goal.TargetAmount = input.TargetAmount
}
if input.CurrentAmount != 0 {
goal.CurrentAmount = input.CurrentAmount
}
if input.TargetDate != "" {
parsedDate, err := time.Parse("2006-01-02", input.TargetDate)
if err != nil {
log.Printf("Error parsing target date for goal update: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid date format for targetDate. Use YYYY-MM-DD"})
return
}
goal.TargetDate = parsedDate
}
if input.Status != "" {
goal.Status = input.Status
}
// Check if goal has been achieved
if goal.CurrentAmount >= goal.TargetAmount {
goal.Status = "Achieved"
log.Printf("Goal ID %d for user %d automatically marked as Achieved", goalID, userID)
}
if err := database.DB.Save(&goal).Error; err != nil {
log.Printf("Error saving updated goal ID %d for user %d: %v", goalID, userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update goal"})
return
}
log.Printf("Goal ID %d updated successfully for user %d", goalID, userID)
c.JSON(http.StatusOK, goal)
}
// UpdateGoalProgress updates just the progress (current amount) of a goal
func (h *GoalHandler) UpdateGoalProgress(c *gin.Context) {
userID := c.MustGet("userID").(uint)
goalID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
log.Printf("Error parsing goal ID for progress update: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid goal ID"})
return
}
var goal models.Goal
if err := database.DB.Where("id = ? AND user_id = ?", goalID, userID).First(&goal).Error; err != nil {
log.Printf("Error fetching goal ID %d for user %d in progress update: %v", goalID, userID, err)
c.JSON(http.StatusNotFound, gin.H{"error": "Goal not found"})
return
}
var input UpdateGoalProgressInput
if err := c.ShouldBindJSON(&input); err != nil {
log.Printf("Error binding JSON for goal progress update: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
goal.CurrentAmount = input.CurrentAmount
// Check if goal has been achieved
if goal.CurrentAmount >= goal.TargetAmount {
goal.Status = "Achieved"
log.Printf("Goal ID %d for user %d automatically marked as Achieved during progress update", goalID, userID)
}
if err := database.DB.Save(&goal).Error; err != nil {
log.Printf("Error saving progress update for goal ID %d for user %d: %v", goalID, userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update goal progress"})
return
}
log.Printf("Goal ID %d progress updated successfully for user %d: %d/%d", goalID, userID, goal.CurrentAmount, goal.TargetAmount)
c.JSON(http.StatusOK, goal)
}
// DeleteGoal deletes a goal belonging to the authenticated user
func (h *GoalHandler) DeleteGoal(c *gin.Context) {
userID := c.MustGet("userID").(uint)
goalID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
log.Printf("Error parsing goal ID for deletion: %v", err)
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid goal ID"})
return
}
var goal models.Goal
if err := database.DB.Where("id = ? AND user_id = ?", goalID, userID).First(&goal).Error; err != nil {
log.Printf("Error fetching goal ID %d for user %d for deletion: %v", goalID, userID, err)
c.JSON(http.StatusNotFound, gin.H{"error": "Goal not found"})
return
}
if err := database.DB.Delete(&goal).Error; err != nil {
log.Printf("Error deleting goal ID %d for user %d: %v", goalID, userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to delete goal"})
return
}
log.Printf("Goal ID %d deleted successfully for user %d", goalID, userID)
c.JSON(http.StatusOK, gin.H{"message": "Goal deleted successfully"})
}
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