Update

internal/service/report_pdf_util.go

@@ -0,0 +1,133 @@
+package service
+
+import (
+	"bytes"
+	"fmt"
+	"html/template"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func renderTemplateToPDF(templatePath string, data interface{}) ([]byte, error) {
+	// Create template with custom functions
+	funcMap := template.FuncMap{
+		"add": func(a, b int) int {
+			return a + b
+		},
+	}
+
+	// Parse and execute HTML template
+	tmpl, err := template.New(filepath.Base(templatePath)).Funcs(funcMap).ParseFiles(templatePath)
+	if err != nil {
+		return nil, fmt.Errorf("parse template: %w", err)
+	}
+	var htmlBuf bytes.Buffer
+	if err := tmpl.Execute(&htmlBuf, data); err != nil {
+		return nil, fmt.Errorf("execute template: %w", err)
+	}
+
+	// Write HTML to a temp file
+	tmpDir, err := os.MkdirTemp("", "daily_report_")
+	if err != nil {
+		return nil, fmt.Errorf("tmp dir: %w", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	htmlPath := filepath.Join(tmpDir, "report.html")
+	pdfPath := filepath.Join(tmpDir, "report.pdf")
+
+	if err := os.WriteFile(htmlPath, htmlBuf.Bytes(), 0644); err != nil {
+		return nil, fmt.Errorf("write html: %w", err)
+	}
+
+	// Use Chrome headless for better CSS rendering
+	chromeArgs := []string{
+		"--headless",
+		"--disable-gpu",
+		"--no-sandbox",
+		"--disable-dev-shm-usage",
+		"--print-to-pdf=" + pdfPath,
+		"--print-to-pdf-no-header",
+		"--print-to-pdf-no-footer",
+		"--print-to-pdf-margin-top=0",
+		"--print-to-pdf-margin-bottom=0",
+		"--print-to-pdf-margin-left=0",
+		"--print-to-pdf-margin-right=0",
+		"--print-to-pdf-paper-width=210mm",
+		"--print-to-pdf-paper-height=297mm",
+		htmlPath,
+	}
+
+	// Try Google Chrome first, then Chromium, then wkhtmltopdf as fallback
+	chromeCmd := exec.Command("google-chrome", chromeArgs...)
+	if out, err := chromeCmd.CombinedOutput(); err != nil {
+		// Fallback to Chromium
+		chromiumCmd := exec.Command("chromium", chromeArgs...)
+		if chromiumOut, err := chromiumCmd.CombinedOutput(); err != nil {
+			// Final fallback to wkhtmltopdf
+			wkhtmlArgs := []string{
+				"--enable-local-file-access",
+				"--dpi", "300",
+				"--page-size", "A4",
+				"--orientation", "Portrait",
+				"--margin-top", "0",
+				"--margin-bottom", "0",
+				"--margin-left", "0",
+				"--margin-right", "0",
+				htmlPath,
+				pdfPath,
+			}
+			wkhtmlCmd := exec.Command("wkhtmltopdf", wkhtmlArgs...)
+			if wkhtmlOut, err := wkhtmlCmd.CombinedOutput(); err != nil {
+				return nil, fmt.Errorf("all PDF generators failed. Chrome error: %v, Chromium error: %v, wkhtmltopdf error: %v, chrome output: %s, chromium output: %s, wkhtmltopdf output: %s", chromeCmd.Err, chromiumCmd.Err, err, string(out), string(chromiumOut), string(wkhtmlOut))
+			}
+		}
+	}
+
+	// Read PDF bytes
+	pdfBytes, err := os.ReadFile(pdfPath)
+	if err != nil {
+		return nil, fmt.Errorf("read pdf: %w", err)
+	}
+	return pdfBytes, nil
+}
+
+func formatCurrency(amount float64) string {
+	// Simple currency formatting: Rp with thousands separators
+	// Note: For exact locale formatting, integrate a locale library later
+	s := fmt.Sprintf("%.0f", amount) // Remove decimal places for cleaner display
+	intPart := addThousandsSep(s)
+	return "Rp " + intPart
+}
+
+func splitAmount(s string) (string, string) {
+	for i := len(s) - 1; i >= 0; i-- {
+		if s[i] == '.' {
+			return s[:i], s[i+1:]
+		}
+	}
+	return s, "00"
+}
+
+func addThousandsSep(s string) string {
+	n := len(s)
+	if n <= 3 {
+		return s
+	}
+	var out bytes.Buffer
+	pre := n % 3
+	if pre > 0 {
+		out.WriteString(s[:pre])
+		if n > pre {
+			out.WriteByte('.')
+		}
+	}
+	for i := pre; i < n; i += 3 {
+		out.WriteString(s[i : i+3])
+		if i+3 < n {
+			out.WriteByte('.')
+		}
+	}
+	return out.String()
+}