From 90f6ec9059362bb5db7964973f38109e6aa12b17 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=EA=A6=8C=EA=A6=AB=EA=A6=B6=EA=A6=8F=EA=A7=80=EA=A6=A6?=
 =?UTF-8?q?=EA=A6=BF=EA=A6=A7=EA=A6=AE=EA=A6=91=EA=A6=A9=EA=A6=AD=EA=A7=80?=
 <erik@darapsa.co.id>
Date: Sun, 9 Oct 2022 15:45:41 +0800
Subject: Replace switch & enum with generic selections

---
 midtrans.c | 53 ++++++++++++++++++++++-------------------------------
 midtrans.h | 24 ++++++------------------
 2 files changed, 28 insertions(+), 49 deletions(-)

diff --git a/midtrans.c b/midtrans.c
index 2673292..a9eb3d7 100644
--- a/midtrans.c
+++ b/midtrans.c
@@ -105,44 +105,34 @@ void midtrans_status(const char *order_id)
 	pthread_create(&threads[num_threads - 1], NULL, request, NULL);
 }
 
-void midtrans_charge(enum midtrans_payment type, void *object,
-		struct midtrans_transaction *transaction,
-		char *custom_fields[])
+void midtrans_charge_banktransfer(struct midtrans_banktransfer *banktransfer,
+		struct midtrans_transaction *transaction, char *custom_fields[])
 {
 	static const char *url_tmpl = "%scharge";
 	char url[strlen(url_tmpl) - strlen("%s") + strlen(base_url) + 1];
 	sprintf(url, url_tmpl, base_url);
 	curl_easy_setopt(curl, CURLOPT_URL, url);
 
-	size_t payment_len = 0;
-	char *payment = NULL;
-	switch (type) {
-		case MIDTRANS_BANKTRANSFER:
-		default:
-			;
-			struct midtrans_banktransfer *banktransfer = object;
-			static const char *va_number_tmpl = ",\n"
-				"\t\t\"va_number\": \"%s\"";
-			size_t va_number_len = 0;
-			char *va_number = NULL;
-			if (banktransfer->va_number) {
-				va_number_len = strlen(va_number_tmpl)
-						- strlen("%s") +
-						strlen(banktransfer->va_number);
-				va_number = malloc(va_number_len + 1);
-				sprintf(va_number, va_number_tmpl,
-						banktransfer->va_number);
-			}
-			static const char *payment_tmpl = "bank_transfer\",\n"
-				"\t\"bank_transfer\": {\n"
-				"\t\t\"bank\": \"%s\"%s";
-			payment_len = strlen(payment_tmpl) - strlen("%s") * 2
-				+ va_number_len + strlen(banktransfer->bank);
-			payment = malloc(payment_len + 1);
-			sprintf(payment, payment_tmpl, banktransfer->bank,
-					va_number_len ? va_number : "");
-			break;
+	static const char *va_number_tmpl = ",\n"
+		"\t\t\"va_number\": \"%s\"";
+	size_t va_number_len = 0;
+	char *va_number = NULL;
+	if (banktransfer->va_number) {
+		va_number_len = strlen(va_number_tmpl) - strlen("%s")
+			+ strlen(banktransfer->va_number);
+		va_number = malloc(va_number_len + 1);
+		sprintf(va_number, va_number_tmpl, banktransfer->va_number);
 	}
+
+	static const char *payment_tmpl = "bank_transfer\",\n"
+		"\t\"bank_transfer\": {\n"
+		"\t\t\"bank\": \"%s\"%s";
+	const size_t payment_len = strlen(payment_tmpl) - strlen("%s") * 2
+		+ va_number_len + strlen(banktransfer->bank);
+	char *payment = malloc(payment_len + 1);
+	sprintf(payment, payment_tmpl, banktransfer->bank,
+			va_number_len ? va_number : "");
+
 	size_t i = 0;
 	size_t fields_len = 0;
 	char *fields = NULL;
@@ -160,6 +150,7 @@ void midtrans_charge(enum midtrans_payment type, void *object,
 		fields_len += field_len;
 		i += 2;
 	}
+
 	static const char *post_tmpl =
 		"{\n"
 		"\t\"payment_type\": \"%s"
diff --git a/midtrans.h b/midtrans.h
index 181e73c..bd03076 100644
--- a/midtrans.h
+++ b/midtrans.h
@@ -6,23 +6,6 @@ struct midtrans_transaction {
 	long gross_amount;
 };
 
-enum midtrans_payment {
-	MIDTRANS_CREDITCARD = 0,
-	MIDTRANS_BANKTRANSFER,
-	MIDTRANS_BCA_KLIKBCA,
-	MIDTRANS_BCA_KLIKPAY,
-	MIDTRANS_BRI_EPAY,
-	MIDTRANS_CIMB_CLICKS,
-	MIDTRANS_DANAMON_ONLINE,
-	MIDTRANS_UOB_EZPAY,
-	MIDTRANS_QRIS,
-	MIDTRANS_GOPAY,
-	MIDTRANS_SHOPEEPAY,
-	MIDTRANS_CSTORE,
-	MIDTRANS_AKULAKU,
-	MIDTRANS_KREDIVO
-};
-
 struct midtrans_banktransfer {
 	char *bank;
 	char *va_number;
@@ -30,13 +13,18 @@ struct midtrans_banktransfer {
 	char *permata;
 };
 
+#define midtrans_charge(x, y, z) _Generic((x),\
+		struct midtrans_banktransfer *:\
+		midtrans_charge_banktransfer(x, y, z)\
+		)
+
 #ifdef __cplusplus
 extern "C" {
 #endif
 
 void midtrans_init(const char *api_key, const char *cainfo);
 void midtrans_status(const char *order_id);
-void midtrans_charge(enum midtrans_payment type, void *payment,
+void midtrans_charge_banktransfer(struct midtrans_banktransfer *banktransfer,
 		struct midtrans_transaction *transaction,
 		char *custom_fields[]);
 void midtrans_cleanup();
-- 
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