package dossier_test

import (
	"bytes"
	"testing"

	"github.com/netcell-it/deklarix/internal/dossier"
)

func TestRenderProducesValidPDF(t *testing.T) {
	content, err := dossier.BuildContent(validData(t))
	if err != nil {
		t.Fatalf("BuildContent: %v", err)
	}

	var buf bytes.Buffer
	if err := dossier.Render(&buf, content); err != nil {
		t.Fatalf("Render: %v", err)
	}

	out := buf.Bytes()
	if !bytes.HasPrefix(out, []byte("%PDF-")) {
		t.Fatalf("output does not start with %%PDF- header: %q", out[:min(20, len(out))])
	}
	if !bytes.Contains(out, []byte("%%EOF")) {
		t.Fatal("output does not contain the expected PDF EOF trailer")
	}
	if len(out) < 500 {
		t.Fatalf("output suspiciously small (%d bytes) for a multi-section dossier", len(out))
	}
}

func TestGenerateProducesValidPDF(t *testing.T) {
	var buf bytes.Buffer
	if err := dossier.Generate(&buf, validData(t)); err != nil {
		t.Fatalf("Generate: %v", err)
	}
	if !bytes.HasPrefix(buf.Bytes(), []byte("%PDF-")) {
		t.Fatal("Generate output does not start with the expected PDF header")
	}
}

func TestGeneratePropagatesBuildContentErrors(t *testing.T) {
	data := validData(t)
	data.Submission.Platform = ""

	var buf bytes.Buffer
	if err := dossier.Generate(&buf, data); err == nil {
		t.Fatal("expected Generate to propagate a BuildContent error, got nil")
	}
}