Add deactivate card functionality: implement handler and HTML template for card deactivation

cmd/api/main.go

@@ -72,12 +72,14 @@ func main() {
 	mux.HandleFunc("GET /login", authHandler.LoginView)
 	mux.HandleFunc("GET /signup", authHandler.SignupHandler)
 	mux.HandleFunc("GET /admin/addcard", adminHanlder.AddCardsView)
+	mux.HandleFunc("GET /admin/deactivatecard", adminHanlder.DeactivateView)
 
 	// POST Request: Processes the form
 	// This matches <form action="/loginauth"> in your HTML
 	mux.HandleFunc("POST /loginauth", authHandler.LoginAuthHandler)
 	mux.HandleFunc("POST /signupauth", authHandler.SignupHandler)
 	mux.HandleFunc("POST /admin/addcardauth", adminHanlder.AddCardHandler)
+	mux.HandleFunc("POST /admin/deactivatecardauth", adminHanlder.DeactivateCardHanlder)
 
 	// Dashboard
 	mux.HandleFunc("/dashboard", dashboardHandler)

internal/admin/deactivateCard.go

@@ -0,0 +1,93 @@
+package adminauth
+
+import (
+	"fmt"
+	"net/http"
+	"strings"
+)
+
+// This struct is used to pass data to the HTML template for the Deactivate Card page.
+// It allows us to easily display error or success messages when we process the form submission for deactivating a card.
+type CardData struct {
+	Error   string
+	Success string
+}
+
+// This struct represents the details of a card that we want to deactivate.
+// We can use it to easily pass card data around in our functions.
+// It also helps to keep our code organized and makes it easier to manage card-related data when we process the deactivation form submission.
+type CardDetails struct {
+	CardNumber string
+	CardType   string
+}
+
+// This function renders the deactivateCard.html template when the admin visits the /admin/deactivatecard page.
+// It doesn't do any processing yet, it just shows the form to the admin.
+// We can also pass an empty CardData struct to the template, which allows us to easily display error or success messages later on when we process the form submission.
+func (h *Handler) DeactivateView(w http.ResponseWriter, r *http.Request) {
+	fmt.Println("DeactivateView running...")
+	// Render the deactivateCard.html template
+	h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{})
+}
+
+// This function handles the form submission from the deactivateCard.html page.
+func (h *Handler) DeactivateCardHanlder(w http.ResponseWriter, r *http.Request) {
+	fmt.Println("Deactivate card handler running...")
+
+	if err := r.ParseForm(); err != nil {
+		h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{Error: "Failed to parse form"})
+		return
+	}
+
+	cardNumber := strings.TrimSpace(r.PostFormValue("cardNumber"))
+	cardHolder := strings.TrimSpace(r.PostFormValue("name"))
+	cardType := strings.TrimSpace(r.PostFormValue("cardType"))
+
+	if cardNumber == "" || cardHolder == "" || cardType == "" {
+		fmt.Println("Missing required fields:", cardNumber, cardHolder, cardType)
+		h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{Error: "Please fill in all required fields."})
+		return
+	}
+
+	// Check if the card exists and is active, then deactivate it
+	ok, err := h.deactivateCardIfActive(cardNumber, cardHolder, cardType)
+	if err != nil {
+		fmt.Println("Error while deactivating card:", err)
+		h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{Error: "Failed to deactivate card."})
+		return
+	}
+
+	if !ok {
+		fmt.Printf("Card not found or already inactive: %s with Card Type: %s\n", cardNumber, cardType)
+		h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{Error: "Card not found or already inactive."})
+		return
+	}
+
+	fmt.Println("Card deactivated successfully:", cardNumber, cardType)
+	h.Tpl.ExecuteTemplate(w, "deactivateCard.html", CardData{Success: "Card deactivated successfully!"})
+}
+
+// --- Helper functions ---
+
+// This function checks if a card with the given number and type is active,
+// and if so, it deactivates it by updating its status in the database.
+func (h *Handler) deactivateCardIfActive(cardNumber, cardHolder, cardType string) (bool, error) {
+	result, err := h.DB.Exec(`
+		UPDATE cards
+		SET status = 'Blocked'
+		WHERE card_number = ?
+		AND card_holder = ? 
+		AND card_type = ?
+		AND status = 'Active'
+	`, cardNumber, cardHolder, cardType)
+	if err != nil {
+		return false, err
+	}
+
+	rows, err := result.RowsAffected()
+	if err != nil {
+		return false, err
+	}
+
+	return rows > 0, nil
+}

templates/addCards.html

@@ -3,8 +3,8 @@
 <head>
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="/assets/admin/addcard.css">
     <title>Add Card</title>
-    <link rel="stylesheet" href="../assets/css/admin/addCard.css">
 </head>
 <body>
     <h1>Add Card</h1>
@@ -14,7 +14,7 @@ <h1>Add Card</h1>
     {{if .Success}}
         <div class="success">{{.Success}}</div>
     {{end}}
-    <form action="/addcardauth" method="POST">
+    <form action="/admin/addcardauth" method="POST">
         <div class="form-group">
             <label for="cardUID">Card UID:</label>
             <input type="text" id="cardUID" name="cardUID" required>

templates/deactivateCard.html

@@ -0,0 +1,44 @@
+<!DOCTYPE html>
+<html lang="en">
+
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <link rel="stylesheet" href="/assets/admin/addcard.css">
+    <title>Deactivate Card</title>
+</head>
+
+<body>
+    <h1>Deactivate Card</h1>
+    {{if .Error}}
+    <div class="error">{{.Error}}</div>
+    {{end}}
+    {{if .Success}}
+    <div class="success">{{.Success}}</div>
+    {{end}}
+    <form action="/admin/deactivatecardauth" method="POST">
+        <div class="form-group">
+            <label for="cardNumber">Card Number:</label>
+            <input type="number" id="cardNumber" name="cardNumber" required>
+        </div>
+        <div class="form-group">
+            <label for="name">Cardholder Name:</label>
+            <input type="text" id="name" name="name" required>
+        </div>
+        <div class="form-group">
+            <label for="cardType">Card Type:</label>
+            <select id="cardType" name="cardType" required>
+                <option value="">-- Select Card Type --</option>
+                <option value="Regular">Regular</option>
+                <option value="Student">Student</option>
+                <option value="Senior">Senior</option>
+                <option value="Concessionary">Concessionary</option>
+            </select>
+        </div>
+
+        <input type="submit" value="Deactivate Card">
+        <input type="button" value="Cancel" class="cancel-button" onclick="window.history.back();">
+    </form>
+</body>
+
+</html>