package config

import (
	"os"
	"testing"
	"time"
)

func TestLoadConfig(t *testing.T) {
	// 创建临时配置文件
	tmpFile, err := os.CreateTemp("", "test_config_*.yaml")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(tmpFile.Name())

	configContent := `
serviceType: client
server:
  address: 127.0.0.1
  port: 1080
  username: testuser
  password: testpass
proxy:
  mode: http
  localPort: 8080
globalProxy:
  enabled: true
  dnsProxy: true
  dnsPort: 5353
logLevel: debug
timeout: 60s
`

	if _, err := tmpFile.WriteString(configContent); err != nil {
		t.Fatal(err)
	}
	tmpFile.Close()

	// 测试加载配置
	config, err := LoadConfig(tmpFile.Name())
	if err != nil {
		t.Fatalf("LoadConfig failed: %v", err)
	}

	// 验证配置值
	if config.ServiceType != "client" {
		t.Errorf("Expected ServiceType 'client', got '%s'", config.ServiceType)
	}

	if config.Server.Address != "127.0.0.1" {
		t.Errorf("Expected Server.Address '127.0.0.1', got '%s'", config.Server.Address)
	}

	if config.Server.Port != 1080 {
		t.Errorf("Expected Server.Port 1080, got %d", config.Server.Port)
	}

	if config.Server.Username != "testuser" {
		t.Errorf("Expected Server.Username 'testuser', got '%s'", config.Server.Username)
	}

	if config.Server.Password != "testpass" {
		t.Errorf("Expected Server.Password 'testpass', got '%s'", config.Server.Password)
	}

	if config.Proxy.LocalPort != 8080 {
		t.Errorf("Expected Proxy.LocalPort 8080, got %d", config.Proxy.LocalPort)
	}

	if config.LogLevel != "debug" {
		t.Errorf("Expected LogLevel 'debug', got '%s'", config.LogLevel)
	}

	if config.Timeout != 60*time.Second {
		t.Errorf("Expected Timeout 60s, got %v", config.Timeout)
	}
}

func TestLoadConfigDefaults(t *testing.T) {
	// 创建最小配置
	tmpFile, err := os.CreateTemp("", "test_config_min_*.yaml")
	if err != nil {
		t.Fatal(err)
	}
	defer os.Remove(tmpFile.Name())

	minimalConfig := `
serviceType: client
server:
  address: 127.0.0.1
  port: 1080
  username: user
  password: pass
`

	if _, err := tmpFile.WriteString(minimalConfig); err != nil {
		t.Fatal(err)
	}
	tmpFile.Close()

	config, err := LoadConfig(tmpFile.Name())
	if err != nil {
		t.Fatalf("LoadConfig failed: %v", err)
	}

	// 验证默认值
	if config.LogLevel != "info" {
		t.Errorf("Expected default LogLevel 'info', got '%s'", config.LogLevel)
	}

	if config.Timeout != 30*time.Second {
		t.Errorf("Expected default Timeout 30s, got %v", config.Timeout)
	}

	if config.Proxy.LocalPort != 8080 {
		t.Errorf("Expected default Proxy.LocalPort 8080, got %d", config.Proxy.LocalPort)
	}
}

func TestGetServerAddr(t *testing.T) {
	config := &Config{
		Server: Server{
			Address: "example.com",
			Port:    1080,
		},
	}

	expected := "example.com:1080"
	result := config.GetServerAddr()

	if result != expected {
		t.Errorf("Expected '%s', got '%s'", expected, result)
	}
}

func TestValidate(t *testing.T) {
	tests := []struct {
		name    string
		config  *Config
		wantErr bool
	}{
		{
			name: "valid config",
			config: &Config{
				Server: Server{
					Address: "127.0.0.1",
					Port:    1080,
				},
				Proxy: Proxy{
					Mode: "http",
				},
			},
			wantErr: false,
		},
		{
			name: "empty address",
			config: &Config{
				Server: Server{
					Address: "",
					Port:    1080,
				},
				Proxy: Proxy{
					Mode: "http",
				},
			},
			wantErr: true,
		},
		{
			name: "invalid port",
			config: &Config{
				Server: Server{
					Address: "127.0.0.1",
					Port:    -1,
				},
				Proxy: Proxy{
					Mode: "http",
				},
			},
			wantErr: true,
		},
		{
			name: "invalid mode",
			config: &Config{
				Server: Server{
					Address: "127.0.0.1",
					Port:    1080,
				},
				Proxy: Proxy{
					Mode: "invalid",
				},
			},
			wantErr: true,
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			err := tt.config.Validate()
			if (err != nil) != tt.wantErr {
				t.Errorf("Validate() error = %v, wantErr %v", err, tt.wantErr)
			}
		})
	}
}