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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"
)
// LoanHandler handles loan-related operations
type LoanHandler struct {
}
// NewLoanHandler creates and returns a new LoanHandler instance
func NewLoanHandler() *LoanHandler {
return &LoanHandler{}
}
// GetLoans retrieves all loans for the authenticated user
func (h *LoanHandler) GetLoans(c *gin.Context) {
userID := c.MustGet("userID").(uint)
var loans []models.Loan
if err := database.DB.Where("user_id = ?", userID).Find(&loans).Error; err != nil {
log.Printf("Error fetching loans for user %d: %v", userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to get loans"})
return
}
c.JSON(http.StatusOK, loans)
}
// GetLoanByID retrieves a specific loan by ID for the authenticated user
func (h *LoanHandler) GetLoanByID(c *gin.Context) {
userID := c.MustGet("userID").(uint)
loanID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid loan ID"})
return
}
var loan models.Loan
if err := database.DB.Where("id = ? AND user_id = ?", loanID, userID).First(&loan).Error; err != nil {
c.JSON(http.StatusNotFound, gin.H{"error": "Loan not found"})
return
}
c.JSON(http.StatusOK, loan)
}
// CreateLoan creates a new loan for the authenticated user
func (h *LoanHandler) CreateLoan(c *gin.Context) {
userID := c.MustGet("userID").(uint)
// Define input structure
type CreateLoanInput struct {
Name string `json:"name" binding:"required"`
OriginalAmount int64 `json:"originalAmount" binding:"required"`
CurrentBalance int64 `json:"currentBalance" binding:"required"`
InterestRate float64 `json:"interestRate"`
StartDate string `json:"startDate"`
EndDate string `json:"endDate"`
AccountID *uint `json:"accountId"`
}
var input CreateLoanInput
if err := c.ShouldBindJSON(&input); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// Parse dates if provided
var startDate, endDate time.Time
var err error
if input.StartDate != "" {
startDate, err = time.Parse("2006-01-02", input.StartDate)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid start date format. Use YYYY-MM-DD"})
return
}
}
if input.EndDate != "" {
endDate, err = time.Parse("2006-01-02", input.EndDate)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid end date format. Use YYYY-MM-DD"})
return
}
}
// Validate account if provided
if input.AccountID != nil {
var account models.Account
if err := database.DB.Where("id = ? AND user_id = ?", *input.AccountID, userID).First(&account).Error; err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Associated account not found or doesn't belong to user"})
return
}
}
// Create loan
loan := models.Loan{
UserID: userID,
AccountID: input.AccountID,
Name: input.Name,
OriginalAmount: input.OriginalAmount,
CurrentBalance: input.CurrentBalance,
InterestRate: input.InterestRate,
}
// Only set dates if they were provided
if !startDate.IsZero() {
loan.StartDate = startDate
}
if !endDate.IsZero() {
loan.EndDate = endDate
}
if err := database.DB.Create(&loan).Error; err != nil {
log.Printf("Error creating loan for user %d: %v", userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to create loan"})
return
}
c.JSON(http.StatusCreated, loan)
}
// UpdateLoan updates an existing loan for the authenticated user
func (h *LoanHandler) UpdateLoan(c *gin.Context) {
userID := c.MustGet("userID").(uint)
loanID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid loan ID"})
return
}
// Find loan
var loan models.Loan
if err := database.DB.Where("id = ? AND user_id = ?", loanID, userID).First(&loan).Error; err != nil {
c.JSON(http.StatusNotFound, gin.H{"error": "Loan not found"})
return
}
// Define update structure
type UpdateLoanInput struct {
Name string `json:"name"`
OriginalAmount int64 `json:"originalAmount"`
CurrentBalance int64 `json:"currentBalance"`
InterestRate float64 `json:"interestRate"`
StartDate string `json:"startDate"`
EndDate string `json:"endDate"`
AccountID *uint `json:"accountId"`
}
var input UpdateLoanInput
if err := c.ShouldBindJSON(&input); err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": err.Error()})
return
}
// Update fields if provided
if input.Name != "" {
loan.Name = input.Name
}
if input.OriginalAmount != 0 {
loan.OriginalAmount = input.OriginalAmount
}
if input.CurrentBalance != 0 {
loan.CurrentBalance = input.CurrentBalance
}
if input.InterestRate != 0 {
loan.InterestRate = input.InterestRate
}
if input.StartDate != "" {
startDate, err := time.Parse("2006-01-02", input.StartDate)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid start date format. Use YYYY-MM-DD"})
return
}
loan.StartDate = startDate
}
if input.EndDate != "" {
endDate, err := time.Parse("2006-01-02", input.EndDate)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid end date format. Use YYYY-MM-DD"})
return
}
loan.EndDate = endDate
}
if input.AccountID != nil {
// Validate account if provided
var account models.Account
if err := database.DB.Where("id = ? AND user_id = ?", *input.AccountID, userID).First(&account).Error; err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Associated account not found or doesn't belong to user"})
return
}
loan.AccountID = input.AccountID
}
// Save changes
if err := database.DB.Save(&loan).Error; err != nil {
log.Printf("Error updating loan ID %d for user %d: %v", loanID, userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to update loan"})
return
}
c.JSON(http.StatusOK, loan)
}
// DeleteLoan deletes a loan belonging to the authenticated user
func (h *LoanHandler) DeleteLoan(c *gin.Context) {
userID := c.MustGet("userID").(uint)
loanID, err := strconv.ParseUint(c.Param("id"), 10, 32)
if err != nil {
c.JSON(http.StatusBadRequest, gin.H{"error": "Invalid loan ID"})
return
}
// Check if loan exists and belongs to user
var loan models.Loan
if err := database.DB.Where("id = ? AND user_id = ?", loanID, userID).First(&loan).Error; err != nil {
c.JSON(http.StatusNotFound, gin.H{"error": "Loan not found"})
return
}
// Delete loan
if err := database.DB.Delete(&loan).Error; err != nil {
log.Printf("Error deleting loan ID %d for user %d: %v", loanID, userID, err)
c.JSON(http.StatusInternalServerError, gin.H{"error": "Failed to delete loan"})
return
}
c.JSON(http.StatusOK, gin.H{"message": "Loan deleted successfully"})
}
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