package service

import (
	"context"
	"testing"
)

func TestPipeline_HappyPath(t *testing.T) {
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一个拿剑的小人",
		AssetType: "sprite",
		ProjectStyle: map[string]string{
			"artStyle": "pixel",
			"palette":  "warm",
		},
		Params: AssetParams{
			Resolution: 64,
			Format:     "spritesheet",
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline failed: %v", err)
	}

	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets")
	}
	if output.Metadata.FrameWidth != 64 {
		t.Errorf("expected FrameWidth=64, got %d", output.Metadata.FrameWidth)
	}
	if output.Metadata.FrameHeight != 64 {
		t.Errorf("expected FrameHeight=64, got %d", output.Metadata.FrameHeight)
	}
}

func TestPipeline_RetryThenPass(t *testing.T) {
	QualityChecker = NewCountedQualityChecker(3)
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一把火焰剑",
		AssetType: "sprite",
		Params: AssetParams{
			Resolution: 32,
			Frames: FrameParams{
				Directions:        4,
				FramesPerDirection: 2,
			},
			Format: "spritesheet",
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline failed: %v", err)
	}

	if len(output.Assets) != 8 {
		t.Errorf("expected 8 assets, got %d", len(output.Assets))
	}
	if output.Metadata.FrameCount != 8 {
		t.Errorf("expected FrameCount=8, got %d", output.Metadata.FrameCount)
	}
	if output.Metadata.Directions != 4 {
		t.Errorf("expected Directions=4, got %d", output.Metadata.Directions)
	}
}

func TestPipeline_MaxRetryDegrade(t *testing.T) {
	QualityChecker = AlwaysFailQualityChecker()
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一只飞龙",
		AssetType: "sprite",
		Params: AssetParams{
			Resolution: 48,
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline failed: %v", err)
	}

	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets even on degrade")
	}
	if output.Metadata.FrameWidth != 48 {
		t.Errorf("expected FrameWidth=48, got %d", output.Metadata.FrameWidth)
	}
}

func TestPipeline_StyleMerge(t *testing.T) {
	QualityChecker = func(_ context.Context, _ []GeneratedImage, style map[string]string) (bool, string, error) {
		if style["artStyle"] != "realistic" {
			t.Errorf("expected artStyle=realistic (task override), got %s", style["artStyle"])
		}
		if style["palette"] != "warm" {
			t.Errorf("expected palette=warm (from project), got %s", style["palette"])
		}
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	_, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "测试风格合并",
		AssetType: "sprite",
		ProjectStyle: map[string]string{
			"artStyle": "pixel",
			"palette":  "warm",
		},
		TaskStyle: map[string]string{
			"artStyle": "realistic",
		},
		Params: AssetParams{Resolution: 64},
	})
	if err != nil {
		t.Fatalf("RunPipeline failed: %v", err)
	}
}

func TestPipeline_WithPromptOptimizer(t *testing.T) {
	// 带标签时 PromptOptimizer 应优化原始提示词
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一个战士",
		AssetType: "sprite",
		Tags:      []string{"像素", "战士", "持剑"},
		Params: AssetParams{
			Resolution: 64,
			Format:     "spritesheet",
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline with tags failed: %v", err)
	}

	// 有标签时应有优化后的输出
	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets")
	}
}

func TestPipeline_WithoutTags(t *testing.T) {
	// 无标签时 PromptOptimizer 应跳过，原始提示词直接进入 PromptBuilder
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	rawPrompt := "一个原始提示词没有标签"

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    rawPrompt,
		AssetType: "sprite",
		Params: AssetParams{
			Resolution: 32,
			Format:     "spritesheet",
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline without tags failed: %v", err)
	}

	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets")
	}
}

func TestPipeline_PromptOptimizerFallback(t *testing.T) {
	// PromptAgent 优化失败（无 API key）也不应阻塞管线
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一个火球术",
		AssetType: "animation",
		Tags:      []string{"火焰", "魔法"},
		Params: AssetParams{
			Resolution: 64,
			Format:     "spritesheet",
		},
	})
	if err != nil {
		t.Fatalf("RunPipeline with fallback prompt agent failed: %v", err)
	}

	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets even on prompt agent fallback")
	}
}

func TestPipeline_PromptOptimizerSkipsEmptyTags(t *testing.T) {
	// 无标签时 prompt 保持原样
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "原始提示词",
		AssetType: "sprite",
		Params:    AssetParams{Resolution: 32},
	})
	if err != nil {
		t.Fatalf("RunPipeline failed: %v", err)
	}
	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets")
	}
}

func TestPipeline_PromptOptimizerRefinesPrompt(t *testing.T) {
	// 有标签时 pipeline 产出优化后的 prompt
	QualityChecker = func(_ context.Context, _ []GeneratedImage, _ map[string]string) (bool, string, error) {
		return true, "", nil
	}
	defer func() { QualityChecker = defaultCheckQuality }()

	output, err := RunPipeline(context.Background(), PipelineInput{
		Prompt:    "一个战士",
		AssetType: "sprite",
		Tags:      []string{"像素", "战士"},
		Params:    AssetParams{Resolution: 32},
	})
	if err != nil {
		t.Fatalf("RunPipeline with tags failed: %v", err)
	}
	if len(output.Assets) == 0 {
		t.Fatal("expected non-empty assets")
	}
}