package viewer

import (
	"bytes"
	"mime/multipart"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestRenderAcceptsMultipartSnapshotFile(t *testing.T) {
	handler := NewStandaloneHandler(HandlerOptions{Title: "Reanimator Chart"})

	var body bytes.Buffer
	writer := multipart.NewWriter(&body)
	part, err := writer.CreateFormFile("snapshot_file", "snapshot.json")
	if err != nil {
		t.Fatalf("CreateFormFile() error = %v", err)
	}

	snapshot := `{
  "target_host": "upload-host",
  "hardware": {
    "board": {
      "serial_number": "BOARD-002"
    }
  }
}`
	if _, err := part.Write([]byte(snapshot)); err != nil {
		t.Fatalf("Write() error = %v", err)
	}
	if err := writer.Close(); err != nil {
		t.Fatalf("Close() error = %v", err)
	}

	req := httptest.NewRequest(http.MethodPost, "/render", &body)
	req.Header.Set("Content-Type", writer.FormDataContentType())
	rec := httptest.NewRecorder()

	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}

	response := rec.Body.String()
	for _, needle := range []string{"upload-host", "BOARD-002", "Board"} {
		if !strings.Contains(response, needle) {
			t.Fatalf("expected response to contain %q", needle)
		}
	}
}

func TestEmbeddedHandlerRootHasNoUploadForm(t *testing.T) {
	handler := NewHandler(HandlerOptions{Title: "Reanimator Chart"})

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rec := httptest.NewRecorder()
	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
	if strings.Contains(rec.Body.String(), "multipart/form-data") {
		t.Fatalf("expected embedded handler root to omit upload form")
	}
}

func TestStandaloneHandlerRootShowsUploadForm(t *testing.T) {
	handler := NewStandaloneHandler(HandlerOptions{Title: "Reanimator Chart"})

	req := httptest.NewRequest(http.MethodGet, "/", nil)
	rec := httptest.NewRecorder()
	handler.ServeHTTP(rec, req)

	if rec.Code != http.StatusOK {
		t.Fatalf("status = %d, want %d", rec.Code, http.StatusOK)
	}
	body := rec.Body.String()
	if !strings.Contains(body, "multipart/form-data") || !strings.Contains(body, "snapshot_file") {
		t.Fatalf("expected standalone handler root to include upload form")
	}
}