package centrifugo

import (
	"testing"
	"time"

	"github.com/golang-jwt/jwt/v5"
	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"
)

func TestNewTokenGenerator(t *testing.T) {
	secret := "test-secret"
	gen := NewTokenGenerator(secret)

	assert.NotNil(t, gen)
	assert.Equal(t, secret, gen.config.Secret)
	assert.Equal(t, time.Hour, gen.config.ExpireIn)
}

func TestNewTokenGeneratorWithConfig(t *testing.T) {
	config := TokenConfig{
		Secret:   "custom-secret",
		ExpireIn: 24 * time.Hour,
	}
	gen := NewTokenGeneratorWithConfig(config)

	assert.NotNil(t, gen)
	assert.Equal(t, config.Secret, gen.config.Secret)
	assert.Equal(t, config.ExpireIn, gen.config.ExpireIn)
}

func TestNewTokenGeneratorWithConfig_DefaultExpire(t *testing.T) {
	config := TokenConfig{
		Secret:   "test-secret",
		ExpireIn: 0, // 應該使用預設值
	}
	gen := NewTokenGeneratorWithConfig(config)

	assert.Equal(t, time.Hour, gen.config.ExpireIn)
}

func TestQuickConnectionToken(t *testing.T) {
	gen := NewTokenGenerator("test-secret")
	userID := "user-123"

	token, err := gen.QuickConnectionToken(userID)

	require.NoError(t, err)
	assert.NotEmpty(t, token)

	// 驗證 Token 內容
	claims := &ConnectionClaims{}
	parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})

	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)
	assert.Equal(t, userID, claims.Sub)
	assert.NotNil(t, claims.ExpiresAt)
	assert.NotNil(t, claims.IssuedAt)
}

func TestGenerateConnectionToken(t *testing.T) {
	gen := NewTokenGenerator("test-secret")

	tests := []struct {
		name    string
		opts    ConnectionTokenOptions
		checkFn func(t *testing.T, claims *ConnectionClaims)
	}{
		{
			name: "basic token",
			opts: ConnectionTokenOptions{
				UserID: "user-123",
			},
			checkFn: func(t *testing.T, claims *ConnectionClaims) {
				assert.Equal(t, "user-123", claims.Sub)
				assert.Nil(t, claims.Info)
				assert.Nil(t, claims.Channels)
			},
		},
		{
			name: "token with info",
			opts: ConnectionTokenOptions{
				UserID: "user-456",
				Info: map[string]interface{}{
					"name": "Daniel",
					"role": "admin",
				},
			},
			checkFn: func(t *testing.T, claims *ConnectionClaims) {
				assert.Equal(t, "user-456", claims.Sub)
				assert.NotNil(t, claims.Info)
				assert.Equal(t, "Daniel", claims.Info["name"])
				assert.Equal(t, "admin", claims.Info["role"])
			},
		},
		{
			name: "token with channels",
			opts: ConnectionTokenOptions{
				UserID:   "user-789",
				Channels: []string{"chat:room-1", "chat:room-2"},
			},
			checkFn: func(t *testing.T, claims *ConnectionClaims) {
				assert.Equal(t, "user-789", claims.Sub)
				assert.Equal(t, []string{"chat:room-1", "chat:room-2"}, claims.Channels)
			},
		},
		{
			name: "token with custom expire",
			opts: ConnectionTokenOptions{
				UserID:   "user-abc",
				ExpireAt: ptrTime(time.Now().Add(48 * time.Hour)),
			},
			checkFn: func(t *testing.T, claims *ConnectionClaims) {
				assert.Equal(t, "user-abc", claims.Sub)
				// 檢查過期時間大約在 48 小時後
				expireTime := claims.ExpiresAt.Time
				assert.True(t, expireTime.After(time.Now().Add(47*time.Hour)))
			},
		},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			token, err := gen.GenerateConnectionToken(tt.opts)
			require.NoError(t, err)
			assert.NotEmpty(t, token)

			// 解析 Token
			claims := &ConnectionClaims{}
			parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
				return []byte("test-secret"), nil
			})

			require.NoError(t, err)
			assert.True(t, parsedToken.Valid)
			tt.checkFn(t, claims)
		})
	}
}

func TestQuickSubscriptionToken(t *testing.T) {
	gen := NewTokenGenerator("test-secret")
	userID := "user-123"
	channel := "private:room-456"

	token, err := gen.QuickSubscriptionToken(userID, channel)

	require.NoError(t, err)
	assert.NotEmpty(t, token)

	// 驗證 Token 內容
	claims := &SubscriptionClaims{}
	parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})

	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)
	assert.Equal(t, userID, claims.Sub)
	assert.Equal(t, channel, claims.Channel)
}

func TestGenerateSubscriptionToken(t *testing.T) {
	gen := NewTokenGenerator("test-secret")

	opts := SubscriptionTokenOptions{
		UserID:  "user-123",
		Channel: "private:room-456",
		Info: map[string]interface{}{
			"role": "moderator",
		},
	}

	token, err := gen.GenerateSubscriptionToken(opts)

	require.NoError(t, err)
	assert.NotEmpty(t, token)

	// 驗證 Token 內容
	claims := &SubscriptionClaims{}
	parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})

	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)
	assert.Equal(t, opts.UserID, claims.Sub)
	assert.Equal(t, opts.Channel, claims.Channel)
	assert.Equal(t, "moderator", claims.Info["role"])
}

func TestGenerateAnonymousToken(t *testing.T) {
	gen := NewTokenGenerator("test-secret")

	token, err := gen.GenerateAnonymousToken()

	require.NoError(t, err)
	assert.NotEmpty(t, token)

	// 驗證 Token 內容
	claims := &ConnectionClaims{}
	parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})

	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)
	assert.Equal(t, "", claims.Sub) // 匿名用戶的 UserID 為空
}

func TestTokenExpiration(t *testing.T) {
	// 創建一個很短過期時間的生成器
	gen := NewTokenGeneratorWithConfig(TokenConfig{
		Secret:   "test-secret",
		ExpireIn: 1 * time.Second,
	})

	token, err := gen.QuickConnectionToken("user-123")
	require.NoError(t, err)

	// 立即驗證應該成功
	claims := &ConnectionClaims{}
	parsedToken, err := jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})
	require.NoError(t, err)
	assert.True(t, parsedToken.Valid)

	// 等待過期
	time.Sleep(2 * time.Second)

	// 過期後驗證應該失敗
	claims2 := &ConnectionClaims{}
	_, err = jwt.ParseWithClaims(token, claims2, func(token *jwt.Token) (interface{}, error) {
		return []byte("test-secret"), nil
	})
	assert.Error(t, err)
	assert.Contains(t, err.Error(), "token is expired")
}

func TestTokenWithWrongSecret(t *testing.T) {
	gen := NewTokenGenerator("correct-secret")

	token, err := gen.QuickConnectionToken("user-123")
	require.NoError(t, err)

	// 使用錯誤的密鑰驗證
	claims := &ConnectionClaims{}
	_, err = jwt.ParseWithClaims(token, claims, func(token *jwt.Token) (interface{}, error) {
		return []byte("wrong-secret"), nil
	})

	assert.Error(t, err)
}

// 輔助函數
func ptrTime(t time.Time) *time.Time {
	return &t
}