//go:build never
// +build never

package documents

import (
	"bytes"
	"encoding/json"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"

	"github.com/jung-kurt/gofpdf"
)

func createPDF(path, title string) error {
	pdf := gofpdf.New("P", "mm", "A4", "")
	pdf.AddPage()
	pdf.SetFont("Helvetica", "", 12)
	pdf.CellFormat(0, 10, title, "", 1, "L", false, 0, "")
	return pdf.OutputFileAndClose(path)
}

func TestGenerateInvoicePDF_Handler_CreatesFile(t *testing.T) {
	dir := t.TempDir()

	// Also create a terms file so merge path is exercised
	if err := createPDF(filepath.Join(dir, "CMC_terms_and_conditions2006_A4.pdf"), "terms"); err != nil {
		t.Fatalf("failed to create terms: %v", err)
	}

	reqBody := InvoicePDFRequest{
		DocumentID:     1,
		InvoiceTitle:   "INV-1001",
		CustomerName:   "Acme Corp",
		ShipVia:        "Courier",
		FOB:            "Sydney",
		IssueDate:      "2025-01-01",
		CurrencySymbol: "$",
		ShowGST:        true,
		LineItems: []InvoiceLineItemRequest{{
			ItemNumber: "1",
			Quantity:   "2",
			Title:      "Widget",
			UnitPrice:  10.00,
			TotalPrice: 20.00,
		}},
		OutputDir: dir,
	}

	// Add an extra file to append
	extraPath := filepath.Join(dir, "extra.pdf")
	if err := createPDF(extraPath, "extra"); err != nil {
		t.Fatalf("failed to create extra: %v", err)
	}
	reqBody.AppendFiles = []string{extraPath}

	b, _ := json.Marshal(reqBody)
	r := httptest.NewRequest(http.MethodPost, "/go/pdf/generate-invoice", bytes.NewReader(b))
	w := httptest.NewRecorder()

	GenerateInvoicePDF(w, r)

	resp := w.Result()
	defer resp.Body.Close()
	if resp.StatusCode != http.StatusOK {
		data, _ := io.ReadAll(resp.Body)
		t.Fatalf("unexpected status: %d body=%s", resp.StatusCode, string(data))
	}

	// Verify file created
	final := filepath.Join(dir, "INV-1001.pdf")
	st, err := os.Stat(final)
	if err != nil {
		t.Fatalf("expected output file not found: %v", err)
	}
	if st.Size() <= 0 {
		t.Fatalf("output pdf has zero size")
	}
}