package application

import (
	"bytes"
	"context"
	"encoding/base64"
	"image"
	"image/color"
	"image/png"
	"strings"
	"sync"
	"testing"
	"time"

	"img_infinite_canvas/internal/domain/design"
	cacheinfra "img_infinite_canvas/internal/infrastructure/cache"
	"img_infinite_canvas/internal/infrastructure/memory"
)

func TestNewEditableTextLayersUsesOCRGeometry(t *testing.T) {
	target := design.Node{
		ID:      "image-1",
		X:       100,
		Y:       200,
		Width:   500,
		Height:  400,
		Content: "https://example.com/source.png",
	}

	nodes := newEditableTextLayers(target, design.TextExtraction{
		Layers: []design.ExtractedTextLayer{
			{
				Text:          "SUMMER SALE",
				X:             0.1,
				Y:             0.2,
				Width:         0.5,
				Height:        0.1,
				FontSize:      24,
				FontFamily:    "Inter",
				FontWeight:    "800",
				Color:         "#223344",
				TextAlign:     "center",
				LineHeight:    1.05,
				LetterSpacing: 1.5,
				StrokeColor:   "#ffffff",
				StrokeWidth:   2,
				Opacity:       0.86,
			},
		},
	})

	if len(nodes) != 1 {
		t.Fatalf("expected one text node, got %d", len(nodes))
	}
	node := nodes[0]
	if node.X != 150 || node.Y != 280 || node.Width != 250 || node.Height != 40 {
		t.Fatalf("unexpected geometry: %#v", node)
	}
	if node.Content != "SUMMER SALE" {
		t.Fatalf("unexpected content: %q", node.Content)
	}
	if node.ParentID != target.ID || node.LayerRole != "editable-text" || node.Tone != "extracted-text" {
		t.Fatalf("unexpected layer metadata: %#v", node)
	}
	if node.FontSize != 24 || node.FontFamily != "Inter" || node.FontWeight != "800" || node.Color != "#223344" || node.TextAlign != "center" {
		t.Fatalf("unexpected text style: %#v", node)
	}
	if node.LineHeight != 1.05 || node.LetterSpacing != 1.5 || node.StrokeColor != "#ffffff" || node.StrokeWidth != 2 || node.Opacity != 0.86 {
		t.Fatalf("unexpected text rendering style: %#v", node)
	}
}

func TestExtractNodeTextCachesOCRResult(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	extractor := &countingTextExtractor{
		result: design.TextExtraction{
			Layers: []design.ExtractedTextLayer{
				{Text: "SUMMER SALE", X: 0.1, Y: 0.2, Width: 0.3, Height: 0.1},
			},
		},
	}
	service := NewDesignService(repo, nil, nil, nil, extractor)
	service.SetTextExtractionCache(cacheinfra.NewMemoryStore(), 10*time.Minute)

	project := design.Project{
		ID:        "project-ocr-cache",
		Title:     "OCR cache",
		Status:    design.StatusReady,
		UpdatedAt: time.Now(),
		Nodes: []design.Node{
			{
				ID:      "image-1",
				Type:    design.NodeTypeImage,
				Content: "https://example.com/source.png",
				Width:   1024,
				Height:  1024,
			},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	first, err := service.ExtractNodeText(ctx, project.ID, "image-1", "extract editable text")
	if err != nil {
		t.Fatal(err)
	}
	second, err := service.ExtractNodeText(ctx, project.ID, "image-1", "extract editable text")
	if err != nil {
		t.Fatal(err)
	}

	if calls := extractor.callCount(); calls != 1 {
		t.Fatalf("expected one extractor call, got %d", calls)
	}
	if len(second.Layers) != 1 || second.Layers[0].Text != first.Layers[0].Text {
		t.Fatalf("expected cached OCR result, got %#v", second)
	}
	if second.Layers[0].OriginalText != "SUMMER SALE" {
		t.Fatalf("expected cached result to keep normalized original text, got %#v", second.Layers[0])
	}
}

func TestExtractNodeTextAsyncReturnsResultThroughProjectThread(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	extractor := &countingTextExtractor{
		result: design.TextExtraction{
			Layers: []design.ExtractedTextLayer{
				{Text: "专利", X: 0.2, Y: 0.1, Width: 0.16, Height: 0.05},
			},
		},
	}
	service := NewDesignService(repo, nil, nil, nil, extractor)
	service.SetTextExtractionCache(cacheinfra.NewMemoryStore(), 10*time.Minute)

	project := design.Project{
		ID:        "project-ocr-async",
		Title:     "OCR async",
		Status:    design.StatusReady,
		UpdatedAt: time.Now(),
		Nodes: []design.Node{
			{
				ID:      "image-async",
				Type:    design.NodeTypeImage,
				Title:   "Patent",
				Content: "https://example.com/patent.png",
				Status:  "success",
				Width:   1768,
				Height:  2556,
			},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	thread, err := service.ExtractNodeTextAsync(ctx, project.ID, "image-async", "eitdortxt")
	if err != nil {
		t.Fatal(err)
	}
	if thread.ThreadID == "" || thread.Project.Nodes[0].Status != "text-extracting" {
		t.Fatalf("expected running text extraction thread, got %#v", thread)
	}

	saved := waitForTextExtractionResult(t, repo, project.ID)
	if saved.Status != design.StatusReady {
		t.Fatalf("expected project ready, got %s", saved.Status)
	}
	if saved.Nodes[0].Status != "success" || saved.Nodes[0].Title != "Patent" {
		t.Fatalf("expected node restored, got %#v", saved.Nodes[0])
	}
	resultMessage := saved.Messages[len(saved.Messages)-1]
	if resultMessage.Type != textExtractionResultMessageType || resultMessage.Name != "text_extraction" {
		t.Fatalf("expected text extraction result message, got %#v", resultMessage)
	}
	if !strings.Contains(resultMessage.Content, `"text":"专利"`) {
		t.Fatalf("expected serialized OCR result, got %s", resultMessage.Content)
	}
	if strings.Contains(resultMessage.Content, "先识别图片中所有可见文字") {
		t.Fatalf("internal OCR prompt leaked into result message: %s", resultMessage.Content)
	}
	if calls := extractor.callCount(); calls != 1 {
		t.Fatalf("expected one extractor call, got %d", calls)
	}
}

func TestGetProjectRestoresNodeWhenTextExtractionAlreadyFinished(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	service := NewDesignService(repo, nil, nil, nil, nil)
	project := design.Project{
		ID:           "project-finished-ocr-status",
		Title:        "Finished OCR status",
		Status:       design.StatusReady,
		UpdatedAt:    time.Now(),
		LastThreadID: "thread-finished",
		Nodes: []design.Node{
			{
				ID:      "image-finished",
				Type:    design.NodeTypeImage,
				Title:   "IMG_1225.JPG",
				Content: "https://example.com/image.jpg",
				Status:  "text-extracting",
				Width:   433,
				Height:  769,
			},
		},
		Messages: []design.Message{
			{
				ID:        "message-result",
				Role:      "tool",
				Type:      textExtractionResultMessageType,
				Name:      "text_extraction",
				Status:    "success",
				ThreadID:  "thread-finished",
				Content:   `{"items":[]}`,
				CreatedAt: time.Now(),
			},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	restored, err := service.GetProject(ctx, project.ID)
	if err != nil {
		t.Fatal(err)
	}
	if restored.Nodes[0].Status != "success" {
		t.Fatalf("expected completed text extraction to restore node status, got %#v", restored.Nodes[0])
	}
	persisted, err := repo.Get(ctx, project.ID)
	if err != nil {
		t.Fatal(err)
	}
	if persisted.Nodes[0].Status != "success" {
		t.Fatalf("expected restored status to be persisted, got %#v", persisted.Nodes[0])
	}
}

func TestGetProjectRestoresStaleTextExtractionNode(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	service := NewDesignService(repo, nil, nil, nil, nil)
	project := design.Project{
		ID:           "project-stale-ocr-status",
		Title:        "Stale OCR status",
		Status:       design.StatusReady,
		UpdatedAt:    time.Now().Add(-textExtractionStaleAfter),
		LastThreadID: "thread-stale",
		Nodes: []design.Node{
			{
				ID:      "image-stale",
				Type:    design.NodeTypeImage,
				Content: "https://example.com/image.jpg",
				Status:  "text-extracting",
			},
		},
		Messages: []design.Message{
			{
				ID:        "message-running",
				Role:      "tool",
				Type:      "tool",
				Name:      "text_extraction",
				Status:    "running",
				ThreadID:  "thread-stale",
				CreatedAt: time.Now().Add(-textExtractionStaleAfter - time.Second),
			},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	restored, err := service.GetProject(ctx, project.ID)
	if err != nil {
		t.Fatal(err)
	}
	if restored.Nodes[0].Status != "success" {
		t.Fatalf("expected stale text extraction to restore node status, got %#v", restored.Nodes[0])
	}
	if restored.Messages[len(restored.Messages)-1].Status != "failed" || restored.Messages[len(restored.Messages)-1].Name != "text_extraction" {
		t.Fatalf("expected stale extraction failure message, got %#v", restored.Messages[len(restored.Messages)-1])
	}
}

func TestSaveCanvasDoesNotRePersistCompletedTextExtractionStatus(t *testing.T) {
	ctx := context.Background()
	repo := memory.NewProjectRepository()
	service := NewDesignService(repo, nil, nil, nil, nil)
	project := design.Project{
		ID:           "project-save-stale-ocr",
		Title:        "Save stale OCR",
		Status:       design.StatusReady,
		UpdatedAt:    time.Now(),
		LastThreadID: "thread-complete",
		Viewport:     design.Viewport{K: 1},
		Nodes: []design.Node{
			{
				ID:      "image-save-stale",
				Type:    design.NodeTypeImage,
				Content: "https://example.com/image.jpg",
				Status:  "success",
			},
		},
		Messages: []design.Message{
			{
				ID:        "message-complete",
				Role:      "tool",
				Type:      textExtractionResultMessageType,
				Name:      "text_extraction",
				Status:    "success",
				ThreadID:  "thread-complete",
				Content:   `{"items":[]}`,
				CreatedAt: time.Now(),
			},
		},
	}
	if err := repo.Save(ctx, project); err != nil {
		t.Fatal(err)
	}

	staleClientNode := project.Nodes[0]
	staleClientNode.Status = "text-extracting"
	saved, err := service.SaveCanvas(ctx, project.ID, design.Viewport{K: 1}, []design.Node{staleClientNode}, nil, "", "", "")
	if err != nil {
		t.Fatal(err)
	}
	if saved.Nodes[0].Status != "success" {
		t.Fatalf("expected save to ignore stale client text-extracting status, got %#v", saved.Nodes[0])
	}
}

func waitForTextExtractionResult(t *testing.T, repo *memory.ProjectRepository, projectID string) design.Project {
	t.Helper()
	deadline := time.Now().Add(2 * time.Second)
	for time.Now().Before(deadline) {
		project, err := repo.Get(context.Background(), projectID)
		if err != nil {
			t.Fatal(err)
		}
		for _, message := range project.Messages {
			if message.Type == textExtractionResultMessageType {
				return project
			}
		}
		time.Sleep(10 * time.Millisecond)
	}
	project, _ := repo.Get(context.Background(), projectID)
	t.Fatalf("timed out waiting for text extraction result: %#v", project.Messages)
	return design.Project{}
}

func TestCreateTextRemovedImageRemovesTextWithoutBoxArtifact(t *testing.T) {
	source := image.NewRGBA(image.Rect(0, 0, 120, 60))
	for y := 0; y < 60; y++ {
		for x := 0; x < 120; x++ {
			source.SetRGBA(x, y, color.RGBA{R: 245, G: 246, B: 247, A: 255})
		}
	}
	for y := 14; y < 28; y++ {
		for x := 16; x < 68; x++ {
			source.SetRGBA(x, y, color.RGBA{A: 255})
		}
	}
	for y := 13; y < 29; y++ {
		source.SetRGBA(15, y, color.RGBA{R: 105, G: 106, B: 107, A: 255})
		source.SetRGBA(68, y, color.RGBA{R: 105, G: 106, B: 107, A: 255})
	}
	for x := 15; x < 69; x++ {
		source.SetRGBA(x, 13, color.RGBA{R: 105, G: 106, B: 107, A: 255})
		source.SetRGBA(x, 28, color.RGBA{R: 105, G: 106, B: 107, A: 255})
	}
	var sourceData bytes.Buffer
	if err := png.Encode(&sourceData, source); err != nil {
		t.Fatal(err)
	}

	service := NewDesignService(nil, nil, nil, nil, nil)
	cleanURL, err := service.createTextRemovedImage(t.Context(), "project", design.Node{
		ID:      "image",
		Type:    design.NodeTypeImage,
		Content: "data:image/png;base64," + base64.StdEncoding.EncodeToString(sourceData.Bytes()),
	}, design.TextExtraction{Layers: []design.ExtractedTextLayer{
		{Text: "stillday", X: 0.12, Y: 0.18, Width: 0.48, Height: 0.28, Color: "#000000"},
	}})
	if err != nil {
		t.Fatal(err)
	}
	data, _, _, ok, err := decodeDataImage(cleanURL)
	if err != nil {
		t.Fatal(err)
	}
	if !ok {
		t.Fatalf("expected data url result, got %s", cleanURL)
	}
	cleaned, err := png.Decode(bytes.NewReader(data))
	if err != nil {
		t.Fatal(err)
	}

	blackPixels := 0
	for y := 14; y < 28; y++ {
		for x := 16; x < 68; x++ {
			pixel := color.RGBAModel.Convert(cleaned.At(x, y)).(color.RGBA)
			if pixel.R < 30 && pixel.G < 30 && pixel.B < 30 {
				blackPixels++
			}
		}
	}
	if blackPixels > 0 {
		t.Fatalf("expected black text pixels to be removed, got %d", blackPixels)
	}
	edgePixels := 0
	for y := 13; y < 29; y++ {
		for x := 15; x < 69; x++ {
			pixel := color.RGBAModel.Convert(cleaned.At(x, y)).(color.RGBA)
			if pixel.R >= 80 && pixel.R <= 130 && pixel.G >= 80 && pixel.G <= 130 && pixel.B >= 80 && pixel.B <= 130 {
				edgePixels++
			}
		}
	}
	if edgePixels > 0 {
		t.Fatalf("expected antialias/shadow pixels to be removed, got %d", edgePixels)
	}

	unchanged := color.RGBAModel.Convert(cleaned.At(90, 40)).(color.RGBA)
	if unchanged.R != 245 || unchanged.G != 246 || unchanged.B != 247 {
		t.Fatalf("expected unrelated background to stay intact, got %#v", unchanged)
	}
}

type countingTextExtractor struct {
	mu     sync.Mutex
	calls  int
	result design.TextExtraction
}

func (f *countingTextExtractor) ExtractText(ctx context.Context, req design.TextExtractionRequest) (design.TextExtraction, error) {
	if err := ctx.Err(); err != nil {
		return design.TextExtraction{}, err
	}
	f.mu.Lock()
	defer f.mu.Unlock()
	f.calls++
	return f.result, nil
}

func (f *countingTextExtractor) callCount() int {
	f.mu.Lock()
	defer f.mu.Unlock()
	return f.calls
}