package unit

import (
	"os"
	"path/filepath"
	"testing"
	"time"

	"github.com/smartystreets/goconvey/convey"
	"github.com/subconverter-go/internal/config"
)

// TestConfigManagerCreation 测试配置管理器创建
func TestConfigManagerCreation(t *testing.T) {
	convey.Convey("配置管理器创建测试", t, func() {
		convey.Convey("创建默认配置管理器", func() {
			manager, err := config.NewConfigManager("")
			convey.So(err, convey.ShouldBeNil)
			convey.So(manager, convey.ShouldNotBeNil)

			// 验证默认配置
			cfg := manager.GetConfig()
			convey.So(cfg, convey.ShouldNotBeNil)
			convey.So(cfg.Server.Host, convey.ShouldEqual, "0.0.0.0")
			convey.So(cfg.Server.Port, convey.ShouldEqual, 25500)
			convey.So(cfg.Logging.Level, convey.ShouldEqual, "info")
			convey.So(cfg.Conversion.DefaultTarget, convey.ShouldEqual, "clash")

			// 清理
			manager.Close()
		})

		convey.Convey("创建带配置文件的配置管理器", func() {
			// 创建临时配置文件
			tempDir := t.TempDir()
			configFile := filepath.Join(tempDir, "test.yaml")
			configContent := `
server:
  host: "127.0.0.1"
  port: 8080
logging:
  level: "debug"
  format: "json"
security:
  access_tokens: ["test-token"]
`

			err := os.WriteFile(configFile, []byte(configContent), 0644)
			convey.So(err, convey.ShouldBeNil)

			// 创建配置管理器
			manager, err := config.NewConfigManager(configFile)
			convey.So(err, convey.ShouldBeNil)
			convey.So(manager, convey.ShouldNotBeNil)

			// 验证配置
			cfg := manager.GetConfig()
			convey.So(cfg.Server.Host, convey.ShouldEqual, "127.0.0.1")
			convey.So(cfg.Server.Port, convey.ShouldEqual, 8080)
			convey.So(cfg.Logging.Level, convey.ShouldEqual, "debug")
			convey.So(len(cfg.Security.AccessTokens), convey.ShouldEqual, 1)
			convey.So(cfg.Security.AccessTokens[0], convey.ShouldEqual, "test-token")

			// 清理
			manager.Close()
		})
	})
}

// TestConfigManagerDefaults 测试默认配置
func TestConfigManagerDefaults(t *testing.T) {
	convey.Convey("默认配置测试", t, func() {
		manager, err := config.NewConfigManager("")
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		cfg := manager.GetConfig()

		convey.Convey("服务器默认配置", func() {
			convey.So(cfg.Server.Host, convey.ShouldEqual, "0.0.0.0")
			convey.So(cfg.Server.Port, convey.ShouldEqual, 25500)
			convey.So(cfg.Server.ReadTimeout, convey.ShouldEqual, 30)
			convey.So(cfg.Server.WriteTimeout, convey.ShouldEqual, 30)
			convey.So(cfg.Server.MaxRequestSize, convey.ShouldEqual, 10*1024*1024)
		})

		convey.Convey("日志默认配置", func() {
			convey.So(cfg.Logging.Level, convey.ShouldEqual, "info")
			convey.So(cfg.Logging.Format, convey.ShouldEqual, "json")
			convey.So(cfg.Logging.Output, convey.ShouldEqual, "stdout")
		})

		convey.Convey("安全默认配置", func() {
			convey.So(len(cfg.Security.AccessTokens), convey.ShouldEqual, 0)
			convey.So(len(cfg.Security.CorsOrigins), convey.ShouldEqual, 1)
			convey.So(cfg.Security.CorsOrigins[0], convey.ShouldEqual, "*")
			convey.So(cfg.Security.RateLimit, convey.ShouldEqual, 0)
			convey.So(cfg.Security.Timeout, convey.ShouldEqual, 60)
		})

		convey.Convey("转换默认配置", func() {
			convey.So(cfg.Conversion.DefaultTarget, convey.ShouldEqual, "clash")
			convey.So(cfg.Conversion.DefaultEmoji, convey.ShouldBeFalse)
			convey.So(cfg.Conversion.DefaultUDP, convey.ShouldBeFalse)
			convey.So(cfg.Conversion.MaxNodes, convey.ShouldEqual, 0)
			convey.So(cfg.Conversion.CacheTimeout, convey.ShouldEqual, 60)
		})
	})
}

// TestConfigManagerEnvironmentVariables 测试环境变量配置
func TestConfigManagerEnvironmentVariables(t *testing.T) {
	convey.Convey("环境变量配置测试", t, func() {
		// 设置环境变量
		os.Setenv("SUBCONVERTER_HOST", "192.168.1.100")
		os.Setenv("SUBCONVERTER_PORT", "9000")
		os.Setenv("SUBCONVERTER_LOG_LEVEL", "debug")
		os.Setenv("SUBCONVERTER_ACCESS_TOKENS", "test-token")
		defer func() {
			os.Unsetenv("SUBCONVERTER_HOST")
			os.Unsetenv("SUBCONVERTER_PORT")
			os.Unsetenv("SUBCONVERTER_LOG_LEVEL")
			os.Unsetenv("SUBCONVERTER_ACCESS_TOKENS")
		}()

		manager, err := config.NewConfigManager("")
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		cfg := manager.GetConfig()

		convey.So(cfg.Server.Host, convey.ShouldEqual, "192.168.1.100")
		convey.So(cfg.Server.Port, convey.ShouldEqual, 9000)
		convey.So(cfg.Logging.Level, convey.ShouldEqual, "debug")
		convey.So(len(cfg.Security.AccessTokens), convey.ShouldEqual, 1)
		convey.So(cfg.Security.AccessTokens[0], convey.ShouldEqual, "test-token")
	})
}

// TestConfigManagerUpdateConfig 测试配置更新
func TestConfigManagerUpdateConfig(t *testing.T) {
	convey.Convey("配置更新测试", t, func() {
		manager, err := config.NewConfigManager("")
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		convey.Convey("更新配置", func() {
			newConfig := manager.GetConfig().Clone()
			newConfig.Server.Host = "127.0.0.1"
			newConfig.Server.Port = 8080
			newConfig.Logging.Level = "debug"

			err := manager.UpdateConfig(newConfig)
			convey.So(err, convey.ShouldBeNil)

			// 验证配置已更新
			updatedConfig := manager.GetConfig()
			convey.So(updatedConfig.Server.Host, convey.ShouldEqual, "127.0.0.1")
			convey.So(updatedConfig.Server.Port, convey.ShouldEqual, 8080)
			convey.So(updatedConfig.Logging.Level, convey.ShouldEqual, "debug")
		})

		convey.Convey("无效配置处理", func() {
			invalidConfig := manager.GetConfig().Clone()
			invalidConfig.Server.Port = -1 // 无效端口

			err := manager.UpdateConfig(invalidConfig)
			convey.So(err, convey.ShouldNotBeNil)
			convey.So(err.Error(), convey.ShouldContain, "invalid port")
		})
	})
}

// TestConfigManagerPartialAccess 测试配置部分访问
func TestConfigManagerPartialAccess(t *testing.T) {
	convey.Convey("配置部分访问测试", t, func() {
		manager, err := config.NewConfigManager("")
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		convey.Convey("获取服务器配置", func() {
			serverConfig := manager.GetServerConfig()
			convey.So(serverConfig, convey.ShouldNotBeNil)
			convey.So(serverConfig.Host, convey.ShouldEqual, "0.0.0.0")
			convey.So(serverConfig.Port, convey.ShouldEqual, 25500)

			// 修改返回的配置不应该影响原始配置
			serverConfig.Host = "modified"
			originalConfig := manager.GetConfig()
			convey.So(originalConfig.Server.Host, convey.ShouldEqual, "0.0.0.0")
		})

		convey.Convey("获取日志配置", func() {
			loggingConfig := manager.GetLoggingConfig()
			convey.So(loggingConfig, convey.ShouldNotBeNil)
			convey.So(loggingConfig.Level, convey.ShouldEqual, "info")
			convey.So(loggingConfig.Format, convey.ShouldEqual, "json")
		})

		convey.Convey("获取安全配置", func() {
			securityConfig := manager.GetSecurityConfig()
			convey.So(securityConfig, convey.ShouldNotBeNil)
			convey.So(len(securityConfig.AccessTokens), convey.ShouldEqual, 0)
			convey.So(securityConfig.RateLimit, convey.ShouldEqual, 0)
		})

		convey.Convey("获取转换配置", func() {
			conversionConfig := manager.GetConversionConfig()
			convey.So(conversionConfig, convey.ShouldNotBeNil)
			convey.So(conversionConfig.DefaultTarget, convey.ShouldEqual, "clash")
			convey.So(conversionConfig.DefaultEmoji, convey.ShouldBeFalse)
		})
	})
}

// TestConfigManagerSaveConfig 测试配置保存
func TestConfigManagerSaveConfig(t *testing.T) {
	convey.Convey("配置保存测试", t, func() {
		tempDir := t.TempDir()
		configFile := filepath.Join(tempDir, "test.yaml")

		// 创建配置管理器
		manager, err := config.NewConfigManager(configFile)
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		convey.Convey("保存配置到文件", func() {
			// 修改配置
			newConfig := manager.GetConfig().Clone()
			newConfig.Server.Host = "127.0.0.1"
			newConfig.Server.Port = 9090
			newConfig.Logging.Level = "debug"

			err := manager.UpdateConfig(newConfig)
			convey.So(err, convey.ShouldBeNil)

			// 检查文件是否存在
			_, err = os.Stat(configFile)
			convey.So(err, convey.ShouldBeNil)

			// 从文件重新加载配置验证
			newManager, err := config.NewConfigManager(configFile)
			convey.So(err, convey.ShouldBeNil)
			defer newManager.Close()

			loadedConfig := newManager.GetConfig()
			convey.So(loadedConfig.Server.Host, convey.ShouldEqual, "127.0.0.1")
			convey.So(loadedConfig.Server.Port, convey.ShouldEqual, 9090)
			convey.So(loadedConfig.Logging.Level, convey.ShouldEqual, "debug")
		})
	})
}

// TestConfigManagerBasicAccess 测试基本配置访问
func TestConfigManagerBasicAccess(t *testing.T) {
	convey.Convey("基本配置访问测试", t, func() {
		manager, err := config.NewConfigManager("")
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		convey.Convey("GetString方法", func() {
			host := manager.GetString("server.host")
			convey.So(host, convey.ShouldEqual, "0.0.0.0")

			level := manager.GetString("logging.level")
			convey.So(level, convey.ShouldEqual, "info")
		})

		convey.Convey("GetInt方法", func() {
			port := manager.GetInt("server.port")
			convey.So(port, convey.ShouldEqual, 25500)

			timeout := manager.GetInt("conversion.timeout_seconds")
			convey.So(timeout, convey.ShouldEqual, 30)
		})

		convey.Convey("GetBool方法", func() {
			cors := manager.GetBool("server.enable_cors")
			convey.So(cors, convey.ShouldBeTrue)

			auth := manager.GetBool("security.enable_auth")
			convey.So(auth, convey.ShouldBeFalse)
		})

		convey.Convey("GetStringSlice方法", func() {
			formats := manager.GetStringSlice("conversion.supported_formats")
			convey.So(formats, convey.ShouldNotBeNil)
			convey.So(len(formats) > 0, convey.ShouldBeTrue)
			convey.So(formats, convey.ShouldContain, "clash")
		})

		convey.Convey("IsSet方法", func() {
			convey.So(manager.IsSet("server.host"), convey.ShouldBeTrue)
			convey.So(manager.IsSet("nonexistent.key"), convey.ShouldBeFalse)
		})

		convey.Convey("Set方法", func() {
			manager.Set("test.key", "test_value")
			value := manager.GetString("test.key")
			convey.So(value, convey.ShouldEqual, "test_value")
		})
	})
}

// TestConfigManagerWatchConfig 测试配置监听
func TestConfigManagerWatchConfig(t *testing.T) {
	convey.Convey("配置监听测试", t, func() {
		tempDir := t.TempDir()
		configFile := filepath.Join(tempDir, "test.yaml")

		// 创建初始配置文件
		configContent := `
server:
  host: "0.0.0.0"
  port: 25500
logging:
  level: "info"
`

		err := os.WriteFile(configFile, []byte(configContent), 0644)
		convey.So(err, convey.ShouldBeNil)

		// 创建配置管理器
		manager, err := config.NewConfigManager(configFile)
		convey.So(err, convey.ShouldBeNil)
		defer manager.Close()

		configChanged := make(chan bool, 1)

		// 开始监听配置变化
		manager.WatchConfig(func(cfg *config.Configuration) {
			configChanged <- true
		})

		convey.Convey("监听配置文件变化", func() {
			// 修改配置文件
			newConfigContent := `
server:
  host: "127.0.0.1"
  port: 8080
logging:
  level: "debug"
`

			err := os.WriteFile(configFile, []byte(newConfigContent), 0644)
			convey.So(err, convey.ShouldBeNil)

			// 等待配置变化事件
			select {
			case changed := <-configChanged:
				convey.So(changed, convey.ShouldBeTrue)

				// 验证配置已更新
				updatedConfig := manager.GetConfig()
				convey.So(updatedConfig.Server.Host, convey.ShouldEqual, "127.0.0.1")
				convey.So(updatedConfig.Server.Port, convey.ShouldEqual, 8080)
				convey.So(updatedConfig.Logging.Level, convey.ShouldEqual, "debug")

			case <-time.After(2 * time.Second):
				convey.So(false, convey.ShouldBeTrue) // 超时失败
			}
		})
	})
}