package cache_test

import (
	"testing"
	"time"

	. "github.com/smartystreets/goconvey/convey"

	"github.com/subconverter-go/internal/cache"
	"github.com/subconverter-go/internal/conversion"
	"github.com/subconverter-go/internal/logging"
)

func TestCacheManager(t *testing.T) {
	Convey("CacheManager", t, func() {
		// 创建日志记录器
		logger, err := logging.NewLogger(&logging.LoggingConfig{
			Level:  "info",
			Format: "text",
			Output: "stdout",
		})
		So(err, ShouldBeNil)

		// 创建缓存配置
		cacheConfig := &cache.CacheConfig{
			Enabled: true,
			TTL:     1 * time.Second,
			MaxSize: 10,
			Cleanup: 100 * time.Millisecond,
		}

		// 创建缓存管理器
		cacheMgr := cache.NewCacheManager(cacheConfig, logger)
		defer cacheMgr.Close()

		Convey("应该能创建和初始化缓存管理器", func() {
			So(cacheMgr, ShouldNotBeNil)
			So(cacheMgr.IsEnabled(), ShouldBeTrue)
			So(cacheMgr.GetSize(), ShouldEqual, 0)
			So(cacheMgr.GetTTL(), ShouldEqual, 1*time.Second)
			So(cacheMgr.GetMaxSize(), ShouldEqual, 10)
		})

		Convey("应该能生成缓存键", func() {
			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
				Group:  "Test",
				UDP:    true,
				Emoji:  false,
			}

			key1 := cacheMgr.GenerateKey(request)
			So(key1, ShouldNotBeEmpty)
			So(len(key1), ShouldEqual, 32) // MD5 hash length

			// 相同请求应该生成相同的键
			key2 := cacheMgr.GenerateKey(request)
			So(key2, ShouldEqual, key1)

			// 不同请求应该生成不同的键
			request.Group = "Different"
			key3 := cacheMgr.GenerateKey(request)
			So(key3, ShouldNotEqual, key1)
		})

		Convey("应该能设置和获取缓存条目", func() {
			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := cacheMgr.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 设置缓存
			err := cacheMgr.Set(key, response)
			So(err, ShouldBeNil)
			So(cacheMgr.GetSize(), ShouldEqual, 1)

			// 获取缓存
			cachedResponse, exists := cacheMgr.Get(key)
			So(exists, ShouldBeTrue)
			So(cachedResponse, ShouldNotBeNil)
			So(cachedResponse.Success, ShouldEqual, true)
			So(cachedResponse.Content, ShouldEqual, "test content")
		})

		Convey("应该能处理缓存未命中", func() {
			key := "nonexistent-key"
			response, exists := cacheMgr.Get(key)
			So(exists, ShouldBeFalse)
			So(response, ShouldBeNil)

			// 检查统计信息
			stats := cacheMgr.GetStats()
			So(stats.Misses, ShouldBeGreaterThan, 0)
		})

		Convey("应该能处理缓存过期", func() {
			// 使用很短的TTL
			shortTTLConfig := &cache.CacheConfig{
				Enabled: true,
				TTL:     100 * time.Millisecond,
				MaxSize: 10,
				Cleanup:  50 * time.Millisecond,
			}

			shortCache := cache.NewCacheManager(shortTTLConfig, logger)
			defer shortCache.Close()

			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := shortCache.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 设置缓存
			err := shortCache.Set(key, response)
			So(err, ShouldBeNil)

			// 立即获取应该成功
			cachedResponse, exists := shortCache.Get(key)
			So(exists, ShouldBeTrue)
			So(cachedResponse, ShouldNotBeNil)

			// 等待过期
			time.Sleep(150 * time.Millisecond)

			// 再次获取应该失败
			cachedResponse, exists = shortCache.Get(key)
			So(exists, ShouldBeFalse)
			So(cachedResponse, ShouldBeNil)
		})

		Convey("应该能执行LRU淘汰策略", func() {
			// 创建小容量缓存
			lruConfig := &cache.CacheConfig{
				Enabled: true,
				TTL:     10 * time.Second,
				MaxSize: 2,
				Cleanup:  1 * time.Second,
			}

			lruCache := cache.NewCacheManager(lruConfig, logger)
			defer lruCache.Close()

			// 添加第一个条目
			request1 := &conversion.ConversionRequest{Target: "clash", URL: "https://example1.com"}
			key1 := lruCache.GenerateKey(request1)
			response1 := &conversion.ConversionResponse{Success: true, Content: "content1"}
			lruCache.Set(key1, response1)

			// 添加第二个条目
			request2 := &conversion.ConversionRequest{Target: "surge", URL: "https://example2.com"}
			key2 := lruCache.GenerateKey(request2)
			response2 := &conversion.ConversionResponse{Success: true, Content: "content2"}
			lruCache.Set(key2, response2)

			So(lruCache.GetSize(), ShouldEqual, 2)

			// 访问第一个条目以更新其LRU状态
			lruCache.Get(key1)

			// 添加第三个条目，应该淘汰第二个条目
			request3 := &conversion.ConversionRequest{Target: "v2ray", URL: "https://example3.com"}
			key3 := lruCache.GenerateKey(request3)
			response3 := &conversion.ConversionResponse{Success: true, Content: "content3"}
			lruCache.Set(key3, response3)

			// 缓存大小应该仍然是2
			So(lruCache.GetSize(), ShouldEqual, 2)

			// 第一个条目应该还存在（被访问过）
			_, exists1 := lruCache.Get(key1)
			So(exists1, ShouldBeTrue)

			// 第二个条目应该被淘汰
			_, exists2 := lruCache.Get(key2)
			So(exists2, ShouldBeFalse)

			// 第三个条目应该存在
			_, exists3 := lruCache.Get(key3)
			So(exists3, ShouldBeTrue)
		})

		Convey("应该能获取统计信息", func() {
			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := cacheMgr.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 初始统计
			stats := cacheMgr.GetStats()
			So(stats.Hits, ShouldEqual, 0)
			So(stats.Misses, ShouldEqual, 0)
			So(stats.HitRate, ShouldEqual, 0.0)

			// 设置缓存
			cacheMgr.Set(key, response)

			// 命中缓存
			cacheMgr.Get(key)

			// 未命中缓存
			cacheMgr.Get("nonexistent")

			// 检查统计信息
			stats = cacheMgr.GetStats()
			So(stats.Hits, ShouldEqual, 1)
			So(stats.Misses, ShouldEqual, 1)
			So(stats.HitRate, ShouldEqual, 0.5)
		})

		Convey("应该能移除和清空缓存", func() {
			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := cacheMgr.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 设置缓存
			cacheMgr.Set(key, response)
			So(cacheMgr.GetSize(), ShouldEqual, 1)

			// 移除特定条目
			cacheMgr.Remove(key)
			So(cacheMgr.GetSize(), ShouldEqual, 0)

			// 再次获取应该失败
			_, exists := cacheMgr.Get(key)
			So(exists, ShouldBeFalse)

			// 重新添加条目
			cacheMgr.Set(key, response)
			So(cacheMgr.GetSize(), ShouldEqual, 1)

			// 清空所有缓存
			cacheMgr.Clear()
			So(cacheMgr.GetSize(), ShouldEqual, 0)
		})

		Convey("应该能处理禁用的缓存", func() {
			disabledConfig := &cache.CacheConfig{
				Enabled: false,
			}

			disabledCache := cache.NewCacheManager(disabledConfig, logger)
			defer disabledCache.Close()

			So(disabledCache.IsEnabled(), ShouldBeFalse)

			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := disabledCache.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 设置缓存应该静默失败
			err := disabledCache.Set(key, response)
			So(err, ShouldBeNil)

			// 获取缓存应该失败
			_, exists := disabledCache.Get(key)
			So(exists, ShouldBeFalse)

			// 统计信息应该为空
			stats := disabledCache.GetStats()
			So(stats.Hits, ShouldEqual, 0)
			So(stats.Misses, ShouldEqual, 0)
		})

		Convey("应该能获取缓存条目详细信息", func() {
			request := &conversion.ConversionRequest{
				Target: "clash",
				URL:    "https://example.com/subscribe",
			}

			key := cacheMgr.GenerateKey(request)
			response := &conversion.ConversionResponse{
				Success: true,
				Content: "test content",
			}

			// 设置缓存
			cacheMgr.Set(key, response)

			// 获取条目信息
			entry, exists := cacheMgr.GetEntry(key)
			So(exists, ShouldBeTrue)
			So(entry, ShouldNotBeNil)
			So(entry.Response.Success, ShouldEqual, true)
			So(entry.AccessCount, ShouldEqual, 1)

			// 访问一次以增加计数
			cacheMgr.Get(key)

			// 再次获取条目信息
			entry, exists = cacheMgr.GetEntry(key)
			So(exists, ShouldBeTrue)
			So(entry.AccessCount, ShouldEqual, 2)
		})

		Convey("应该能获取所有缓存键", func() {
			// 清空缓存
			cacheMgr.Clear()

			requests := []*conversion.ConversionRequest{
				{Target: "clash", URL: "https://example1.com"},
				{Target: "surge", URL: "https://example2.com"},
				{Target: "v2ray", URL: "https://example3.com"},
			}

			// 添加多个条目
			for _, req := range requests {
				key := cacheMgr.GenerateKey(req)
				response := &conversion.ConversionResponse{Success: true, Content: "content"}
				cacheMgr.Set(key, response)
			}

			// 获取所有键
			keys := cacheMgr.GetAllKeys()
			So(len(keys), ShouldEqual, 3)

			// 验证所有键都存在
			for _, req := range requests {
				expectedKey := cacheMgr.GenerateKey(req)
				found := false
				for _, key := range keys {
					if key == expectedKey {
						found = true
						break
					}
				}
				So(found, ShouldBeTrue)
			}
		})
	})
}

func TestCacheManagerConfiguration(t *testing.T) {
	Convey("CacheManager Configuration", t, func() {
		logger, err := logging.NewLogger(&logging.LoggingConfig{
			Level:  "info",
			Format: "text",
			Output: "stdout",
		})
		So(err, ShouldBeNil)

		Convey("应该能使用默认配置", func() {
			cacheMgr := cache.NewCacheManager(nil, logger)
			defer cacheMgr.Close()

			So(cacheMgr, ShouldNotBeNil)
			So(cacheMgr.IsEnabled(), ShouldBeTrue)
			So(cacheMgr.GetTTL(), ShouldEqual, 5*time.Minute)
			So(cacheMgr.GetMaxSize(), ShouldEqual, 1000)
		})

		Convey("应该能动态配置缓存参数", func() {
			config := &cache.CacheConfig{
				Enabled: true,
				TTL:     2 * time.Minute,
				MaxSize: 500,
			}

			cacheMgr := cache.NewCacheManager(config, logger)
			defer cacheMgr.Close()

			// 修改TTL
			newTTL := 10 * time.Minute
			cacheMgr.SetTTL(newTTL)
			So(cacheMgr.GetTTL(), ShouldEqual, newTTL)

			// 修改最大大小
			newMaxSize := 2000
			cacheMgr.SetMaxSize(newMaxSize)
			So(cacheMgr.GetMaxSize(), ShouldEqual, newMaxSize)
		})
	})
}