package jobs

import (
	"bytes"
	"image"
	"image/color"
	"image/png"
	"io"
	"log/slog"
	"mime/multipart"
	"net/http/httptest"
	"net/textproto"
	"testing"

	"warpbox.dev/backend/libs/services"
)

func TestGenerateMissingThumbnailsForBox(t *testing.T) {
	service := newThumbnailTestUploadService(t)
	result := createThumbnailTestBox(t, service)
	box, err := service.GetBox(result.BoxID)
	if err != nil {
		t.Fatalf("GetBox returned error: %v", err)
	}
	if box.Files[0].Thumbnail != "" {
		t.Fatalf("thumbnail should start empty")
	}

	jobResult, err := generateMissingThumbnailsForBox(service, slog.New(slog.NewTextHandler(io.Discard, nil)), box)
	if err != nil {
		t.Fatalf("generateMissingThumbnailsForBox returned error: %v", err)
	}
	if jobResult.Generated != 1 || jobResult.Failed != 0 {
		t.Fatalf("job result = %+v, want 1 generated and 0 failed", jobResult)
	}

	updated, err := service.GetBox(result.BoxID)
	if err != nil {
		t.Fatalf("GetBox after thumbnail returned error: %v", err)
	}
	if updated.Files[0].Thumbnail == "" {
		t.Fatalf("thumbnail was not saved to box metadata")
	}
	if service.ThumbnailPath(updated, updated.Files[0]) == "" {
		t.Fatalf("thumbnail path was empty")
	}
}

func newThumbnailTestUploadService(t *testing.T) *services.UploadService {
	t.Helper()
	service, err := services.NewUploadService(1024*1024, t.TempDir(), "http://example.test", slog.New(slog.NewTextHandler(io.Discard, nil)))
	if err != nil {
		t.Fatalf("NewUploadService returned error: %v", err)
	}
	t.Cleanup(func() {
		if err := service.Close(); err != nil {
			t.Fatalf("Close returned error: %v", err)
		}
	})
	return service
}

func createThumbnailTestBox(t *testing.T, service *services.UploadService) services.UploadResult {
	t.Helper()
	result, err := service.CreateBox(thumbnailTestFileHeaders(t), services.UploadOptions{MaxDays: 1})
	if err != nil {
		t.Fatalf("CreateBox returned error: %v", err)
	}
	return result
}

func thumbnailTestFileHeaders(t *testing.T) []*multipart.FileHeader {
	t.Helper()
	var imageData bytes.Buffer
	img := image.NewRGBA(image.Rect(0, 0, 2, 2))
	img.Set(0, 0, color.RGBA{R: 255, A: 255})
	if err := png.Encode(&imageData, img); err != nil {
		t.Fatalf("png.Encode returned error: %v", err)
	}

	var payload bytes.Buffer
	writer := multipart.NewWriter(&payload)
	header := make(textproto.MIMEHeader)
	header.Set("Content-Disposition", `form-data; name="file"; filename="thumb.png"`)
	header.Set("Content-Type", "image/png")
	part, err := writer.CreatePart(header)
	if err != nil {
		t.Fatalf("CreateFormFile returned error: %v", err)
	}
	if _, err := part.Write(imageData.Bytes()); err != nil {
		t.Fatalf("part.Write returned error: %v", err)
	}
	if err := writer.Close(); err != nil {
		t.Fatalf("writer.Close returned error: %v", err)
	}

	request := httptest.NewRequest("POST", "/upload", &payload)
	request.Header.Set("Content-Type", writer.FormDataContentType())
	if err := request.ParseMultipartForm(1024 * 1024); err != nil {
		t.Fatalf("ParseMultipartForm returned error: %v", err)
	}
	return request.MultipartForm.File["file"]
}