From cfb0d4ebc67f47014562b69b16d567736fd58934 Mon Sep 17 00:00:00 2001
From: Fred Boniface <fred@fjla.uk>
Date: Tue, 5 Sep 2023 12:05:04 +0100
Subject: [PATCH] Implement mailto barcodes and corresponding test

---
 formatting/email.go      | 48 ++++++++++++++++++++++++++++++++++++++++
 formatting/email_test.go | 48 ++++++++++++++++++++++++++++++++++++++++
 2 files changed, 96 insertions(+)
 create mode 100644 formatting/email.go
 create mode 100644 formatting/email_test.go

diff --git a/formatting/email.go b/formatting/email.go
new file mode 100644
index 0000000..55981a0
--- /dev/null
+++ b/formatting/email.go
@@ -0,0 +1,48 @@
+package formatting
+
+import (
+	"encoding/json"
+	"net/url"
+)
+
+type EMail struct {
+	Address string  `json:"address,omitempty"`
+	Cc      *string `json:"cc,omitempty"`
+	Bcc     *string `json:"bcc,omitempty"`
+	Subject *string `json:"subject,omitempty"`
+	Content *string `json:"content,omitempty"`
+}
+
+func formatEMail(input string) (string, error) {
+	var email EMail
+	err := json.Unmarshal([]byte(input), &email)
+	if err != nil {
+		return "", err
+	}
+
+	query := url.Values{}
+
+	if email.Subject != nil {
+		query.Add("subject", *email.Subject)
+	}
+
+	if email.Cc != nil {
+		query.Add("cc", *email.Cc)
+	}
+
+	if email.Bcc != nil {
+		query.Add("bcc", *email.Bcc)
+	}
+
+	if email.Content != nil {
+		query.Add("body", *email.Content)
+	}
+
+	barcodeString := "mailto:" + email.Address
+
+	if len(query) > 0 {
+		barcodeString += "?" + query.Encode()
+	}
+
+	return barcodeString, err
+}
diff --git a/formatting/email_test.go b/formatting/email_test.go
new file mode 100644
index 0000000..d70c1ff
--- /dev/null
+++ b/formatting/email_test.go
@@ -0,0 +1,48 @@
+package formatting
+
+import (
+	"testing"
+)
+
+func TestFormatEmail(t *testing.T) {
+	testCases := []struct {
+		inputJSON   string
+		expectedURL string
+	}{
+		{
+			inputJSON: `{
+				"address": "testing@example.com"
+			}`,
+			expectedURL: "mailto:testing@example.com",
+		},
+		{
+			inputJSON: `{
+				"address": "testing@example.com",
+				"subject": "Hello",
+				"cc": "cc@example.com"
+			}`,
+			expectedURL: "mailto:testing@example.com?cc=cc%40example.com&subject=Hello",
+		},
+		{
+			inputJSON: `{
+				"address": "testing@example.com",
+				"subject": "Subject",
+				"cc": "cc@example.com",
+				"bcc": "bcc@example.com",
+				"content": "this is email content"
+			}`,
+			expectedURL: "mailto:testing@example.com?bcc=bcc%40example.com&body=this+is+email+content&cc=cc%40example.com&subject=Subject",
+		},
+	}
+
+	for _, testCase := range testCases {
+		result, err := formatEMail(testCase.inputJSON)
+		if err != nil {
+			t.Errorf("Unexpected Error: %v", err)
+		}
+
+		if result != testCase.expectedURL {
+			t.Errorf("Input JSON: \n%s\n\nExpected: %s\n\n Got: %s", testCase.inputJSON, testCase.expectedURL, result)
+		}
+	}
+}