package service

import (
	"context"
	"errors"
	"strings"
	"testing"
	"time"

	"carrotskin/pkg/storage"
)

// TestUploadService_FileTypes 测试文件类型常量
func TestUploadService_FileTypes(t *testing.T) {
	if FileTypeAvatar == "" {
		t.Error("FileTypeAvatar should not be empty")
	}

	if FileTypeTexture == "" {
		t.Error("FileTypeTexture should not be empty")
	}

	if FileTypeAvatar == FileTypeTexture {
		t.Error("FileTypeAvatar and FileTypeTexture should be different")
	}
}

// TestGetUploadConfig 测试获取上传配置
func TestGetUploadConfig(t *testing.T) {
	tests := []struct {
		name       string
		fileType   FileType
		wantConfig bool
	}{
		{
			name:       "头像类型返回配置",
			fileType:   FileTypeAvatar,
			wantConfig: true,
		},
		{
			name:       "材质类型返回配置",
			fileType:   FileTypeTexture,
			wantConfig: true,
		},
		{
			name:       "无效类型返回nil",
			fileType:   FileType("invalid"),
			wantConfig: false,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			config := GetUploadConfig(tt.fileType)
			hasConfig := config != nil
			if hasConfig != tt.wantConfig {
				t.Errorf("GetUploadConfig() = %v, want %v", hasConfig, tt.wantConfig)
			}

			if config != nil {
				// 验证配置字段
				if config.MinSize <= 0 {
					t.Error("MinSize should be greater than 0")
				}
				if config.MaxSize <= 0 {
					t.Error("MaxSize should be greater than 0")
				}
				if config.MaxSize < config.MinSize {
					t.Error("MaxSize should be greater than or equal to MinSize")
				}
				if config.Expires <= 0 {
					t.Error("Expires should be greater than 0")
				}
				if len(config.AllowedExts) == 0 {
					t.Error("AllowedExts should not be empty")
				}
			}
		})
	}
}

// TestGetUploadConfig_AvatarConfig 测试头像配置详情
func TestGetUploadConfig_AvatarConfig(t *testing.T) {
	config := GetUploadConfig(FileTypeAvatar)
	if config == nil {
		t.Fatal("Avatar config should not be nil")
	}

	// 验证允许的扩展名
	expectedExts := []string{".jpg", ".jpeg", ".png", ".gif", ".webp"}
	for _, ext := range expectedExts {
		if !config.AllowedExts[ext] {
			t.Errorf("Avatar config should allow %s extension", ext)
		}
	}

	// 验证文件大小限制
	if config.MinSize != 1024 {
		t.Errorf("Avatar MinSize = %d, want 1024", config.MinSize)
	}

	if config.MaxSize != 5*1024*1024 {
		t.Errorf("Avatar MaxSize = %d, want 5MB", config.MaxSize)
	}

	// 验证过期时间
	if config.Expires != 15*time.Minute {
		t.Errorf("Avatar Expires = %v, want 15 minutes", config.Expires)
	}
}

// TestGetUploadConfig_TextureConfig 测试材质配置详情
func TestGetUploadConfig_TextureConfig(t *testing.T) {
	config := GetUploadConfig(FileTypeTexture)
	if config == nil {
		t.Fatal("Texture config should not be nil")
	}

	// 验证允许的扩展名（材质只允许PNG）
	if !config.AllowedExts[".png"] {
		t.Error("Texture config should allow .png extension")
	}

	// 验证文件大小限制
	if config.MinSize != 1024 {
		t.Errorf("Texture MinSize = %d, want 1024", config.MinSize)
	}

	if config.MaxSize != 10*1024*1024 {
		t.Errorf("Texture MaxSize = %d, want 10MB", config.MaxSize)
	}

	// 验证过期时间
	if config.Expires != 15*time.Minute {
		t.Errorf("Texture Expires = %v, want 15 minutes", config.Expires)
	}
}

// TestValidateFileName 测试文件名验证
func TestValidateFileName(t *testing.T) {
	tests := []struct {
		name        string
		fileName    string
		fileType    FileType
		wantErr     bool
		errContains string
	}{
		{
			name:     "有效的头像文件名",
			fileName: "avatar.png",
			fileType: FileTypeAvatar,
			wantErr:  false,
		},
		{
			name:     "有效的材质文件名",
			fileName: "texture.png",
			fileType: FileTypeTexture,
			wantErr:  false,
		},
		{
			name:        "文件名为空",
			fileName:    "",
			fileType:    FileTypeAvatar,
			wantErr:     true,
			errContains: "文件名不能为空",
		},
		{
			name:        "不支持的文件扩展名",
			fileName:    "file.txt",
			fileType:    FileTypeAvatar,
			wantErr:     true,
			errContains: "不支持的文件格式",
		},
		{
			name:        "无效的文件类型",
			fileName:    "file.png",
			fileType:    FileType("invalid"),
			wantErr:     true,
			errContains: "不支持的文件类型",
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := ValidateFileName(tt.fileName, tt.fileType)
			if (err != nil) != tt.wantErr {
				t.Errorf("ValidateFileName() error = %v, wantErr %v", err, tt.wantErr)
				return
			}
			if tt.wantErr && tt.errContains != "" {
				if err == nil || !strings.Contains(err.Error(), tt.errContains) {
					t.Errorf("ValidateFileName() error = %v, should contain %s", err, tt.errContains)
				}
			}
		})
	}
}

// TestValidateFileName_Extensions 测试各种扩展名
func TestValidateFileName_Extensions(t *testing.T) {
	avatarExts := []string{".jpg", ".jpeg", ".png", ".gif", ".webp"}
	for _, ext := range avatarExts {
		fileName := "test" + ext
		err := ValidateFileName(fileName, FileTypeAvatar)
		if err != nil {
			t.Errorf("Avatar file with %s extension should be valid, got error: %v", ext, err)
		}
	}

	// 材质只支持PNG
	textureExts := []string{".png"}
	for _, ext := range textureExts {
		fileName := "test" + ext
		err := ValidateFileName(fileName, FileTypeTexture)
		if err != nil {
			t.Errorf("Texture file with %s extension should be valid, got error: %v", ext, err)
		}
	}

	// 测试不支持的扩展名
	invalidExts := []string{".txt", ".pdf", ".doc"}
	for _, ext := range invalidExts {
		fileName := "test" + ext
		err := ValidateFileName(fileName, FileTypeAvatar)
		if err == nil {
			t.Errorf("Avatar file with %s extension should be invalid", ext)
		}
	}
}

// TestValidateFileName_CaseInsensitive 测试扩展名大小写不敏感
func TestValidateFileName_CaseInsensitive(t *testing.T) {
	testCases := []struct {
		fileName string
		fileType FileType
		wantErr  bool
	}{
		{"test.PNG", FileTypeAvatar, false},
		{"test.JPG", FileTypeAvatar, false},
		{"test.JPEG", FileTypeAvatar, false},
		{"test.GIF", FileTypeAvatar, false},
		{"test.WEBP", FileTypeAvatar, false},
		{"test.PnG", FileTypeTexture, false},
	}

	for _, tc := range testCases {
		t.Run(tc.fileName, func(t *testing.T) {
			err := ValidateFileName(tc.fileName, tc.fileType)
			if (err != nil) != tc.wantErr {
				t.Errorf("ValidateFileName(%s, %s) error = %v, wantErr %v", tc.fileName, tc.fileType, err, tc.wantErr)
			}
		})
	}
}

// TestUploadConfig_Structure 测试UploadConfig结构
func TestUploadConfig_Structure(t *testing.T) {
	config := &UploadConfig{
		AllowedExts: map[string]bool{
			".png": true,
		},
		MinSize: 1024,
		MaxSize: 5 * 1024 * 1024,
		Expires: 15 * time.Minute,
	}

	if config.AllowedExts == nil {
		t.Error("AllowedExts should not be nil")
	}

	if config.MinSize <= 0 {
		t.Error("MinSize should be greater than 0")
	}

	if config.MaxSize <= config.MinSize {
		t.Error("MaxSize should be greater than MinSize")
	}

	if config.Expires <= 0 {
		t.Error("Expires should be greater than 0")
	}
}

// mockStorageClient 用于单元测试的简单存储客户端假实现
// 注意：这里只声明与 upload_service 使用到的方法，避免依赖真实 MinIO 客户端
type mockStorageClient struct {
	getBucketFn                func(name string) (string, error)
	generatePresignedPostURLFn func(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration) (*storage.PresignedPostPolicyResult, error)
}

func (m *mockStorageClient) GetBucket(name string) (string, error) {
	if m.getBucketFn != nil {
		return m.getBucketFn(name)
	}
	return "", errors.New("GetBucket not implemented")
}

func (m *mockStorageClient) GeneratePresignedPostURL(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration) (*storage.PresignedPostPolicyResult, error) {
	if m.generatePresignedPostURLFn != nil {
		return m.generatePresignedPostURLFn(ctx, bucketName, objectName, minSize, maxSize, expires)
	}
	return nil, errors.New("GeneratePresignedPostURL not implemented")
}

// TestGenerateAvatarUploadURL_Success 测试头像上传URL生成成功
func TestGenerateAvatarUploadURL_Success(t *testing.T) {
	ctx := context.Background()

	mockClient := &mockStorageClient{
		getBucketFn: func(name string) (string, error) {
			if name != "avatars" {
				t.Fatalf("unexpected bucket name: %s", name)
			}
			return "avatars-bucket", nil
		},
		generatePresignedPostURLFn: func(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration) (*storage.PresignedPostPolicyResult, error) {
			if bucketName != "avatars-bucket" {
				t.Fatalf("unexpected bucketName: %s", bucketName)
			}
			if !strings.Contains(objectName, "user_") {
				t.Fatalf("objectName should contain user_ prefix, got: %s", objectName)
			}
			if !strings.Contains(objectName, "avatar.png") {
				t.Fatalf("objectName should contain original file name, got: %s", objectName)
			}
			// 检查大小与过期时间传递
			if minSize != 1024 {
				t.Fatalf("minSize = %d, want 1024", minSize)
			}
			if maxSize != 5*1024*1024 {
				t.Fatalf("maxSize = %d, want 5MB", maxSize)
			}
			if expires != 15*time.Minute {
				t.Fatalf("expires = %v, want 15m", expires)
			}
			return &storage.PresignedPostPolicyResult{
				PostURL:  "http://example.com/upload",
				FormData: map[string]string{"key": objectName},
				FileURL:  "http://example.com/file/" + objectName,
			}, nil
		},
	}

	// 直接将 mock 实例转换为真实类型使用（依赖其方法集与被测代码一致）
	storageClient := (*storage.StorageClient)(nil)
	_ = storageClient // 避免未使用告警，实际调用仍通过 mockClient 完成

	// 直接通过内部使用接口的实现进行测试，避免依赖真实 StorageClient
	result, err := generateAvatarUploadURLWithClient(ctx, mockClient, 123, "avatar.png")

	if err != nil {
		t.Fatalf("GenerateAvatarUploadURL() error = %v, want nil", err)
	}
	if result == nil {
		t.Fatalf("GenerateAvatarUploadURL() result is nil")
	}
	if result.PostURL == "" || result.FileURL == "" {
		t.Fatalf("GenerateAvatarUploadURL() result has empty URLs: %+v", result)
	}
}

// TestGenerateTextureUploadURL_Success 测试材质上传URL生成成功（SKIN/CAPE）
func TestGenerateTextureUploadURL_Success(t *testing.T) {
	ctx := context.Background()

	tests := []struct {
		name        string
		textureType string
	}{
		{"SKIN 材质", "SKIN"},
		{"CAPE 材质", "CAPE"},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			mockClient := &mockStorageClient{
				getBucketFn: func(name string) (string, error) {
					if name != "textures" {
						t.Fatalf("unexpected bucket name: %s", name)
					}
					return "textures-bucket", nil
				},
				generatePresignedPostURLFn: func(ctx context.Context, bucketName, objectName string, minSize, maxSize int64, expires time.Duration) (*storage.PresignedPostPolicyResult, error) {
					if bucketName != "textures-bucket" {
						t.Fatalf("unexpected bucketName: %s", bucketName)
					}
					if !strings.Contains(objectName, "texture.png") {
						t.Fatalf("objectName should contain original file name, got: %s", objectName)
					}
					if !strings.Contains(objectName, "/"+strings.ToLower(tt.textureType)+"/") {
						t.Fatalf("objectName should contain texture type folder, got: %s", objectName)
					}
					return &storage.PresignedPostPolicyResult{
						PostURL:  "http://example.com/upload",
						FormData: map[string]string{"key": objectName},
						FileURL:  "http://example.com/file/" + objectName,
					}, nil
				},
			}

			result, err := generateTextureUploadURLWithClient(ctx, mockClient, 123, "texture.png", tt.textureType)
			if err != nil {
				t.Fatalf("generateTextureUploadURLWithClient() error = %v, want nil", err)
			}
			if result == nil || result.PostURL == "" || result.FileURL == "" {
				t.Fatalf("generateTextureUploadURLWithClient() result invalid: %+v", result)
			}
		})
	}
}