package starnet

import (
	"fmt"
	"net/http"
	"net/http/httptest"
	"runtime"
	"testing"
)

// BenchmarkGetRequest 测试单个 GET 请求的性能
func BenchmarkGetRequest(b *testing.B) {
	// 创建测试服务器
	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		rw.Write([]byte(`OK`))
	}))
	defer server.Close()

	// 重置计时器，排除设置代码的影响
	b.ResetTimer()

	// 报告内存分配情况
	b.ReportAllocs()

	// 运行基准测试
	for i := 0; i < b.N; i++ {
		resp, err := Get(server.URL, WithSkipTLSVerify(true))
		if err != nil {
			b.Errorf("Unexpected error: %v", err)
		}

		body := resp.Body().String()
		if body != "OK" {
			b.Errorf("Expected OK, got %v", body)
		}
	}
}

// BenchmarkGetRequestWithHeaders 测试带请求头的 GET 请求性能
func BenchmarkGetRequestWithHeaders(b *testing.B) {
	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		// 验证请求头
		if req.Header.Get("hello") != "world" {
			rw.WriteHeader(http.StatusBadRequest)
			return
		}
		rw.Write([]byte(`OK`))
	}))
	defer server.Close()

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		resp, err := Get(server.URL,
			WithSkipTLSVerify(true),
			WithHeader("hello", "world"),
			WithUserAgent("hello world"))
		if err != nil {
			b.Errorf("Unexpected error: %v", err)
		}

		body := resp.Body().String()
		if body != "OK" {
			b.Errorf("Expected OK, got %v", body)
		}
	}
}

// BenchmarkPostRequest 测试 POST 请求的性能
func BenchmarkPostRequest(b *testing.B) {
	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		// 读取并返回请求体
		body := make([]byte, req.ContentLength)
		req.Body.Read(body)
		rw.Write(body)
	}))
	defer server.Close()

	testData := "This is a test payload for POST request"

	b.ResetTimer()
	b.ReportAllocs()

	for i := 0; i < b.N; i++ {
		resp, err := Post(server.URL,
			WithSkipTLSVerify(true),
			WithBytes([]byte(testData)),
			WithContentType("text/plain"))
		if err != nil {
			b.Errorf("Unexpected error: %v", err)
		}

		body := resp.Body().String()
		if body != testData {
			b.Errorf("Expected %s, got %v", testData, body)
		}
	}
}

// BenchmarkConcurrentRequests 测试并发请求性能
func BenchmarkConcurrentRequests(b *testing.B) {
	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		rw.Write([]byte(`OK`))
	}))
	defer server.Close()

	b.ResetTimer()
	b.ReportAllocs()

	// 运行并发基准测试
	b.RunParallel(func(pb *testing.PB) {
		for pb.Next() {
			resp, err := Get(server.URL, WithSkipTLSVerify(true))
			if err != nil {
				b.Errorf("Unexpected error: %v", err)
			}

			body := resp.Body().String()
			if body != "OK" {
				b.Errorf("Expected OK, got %v", body)
			}
		}
	})
}

// BenchmarkMemoryUsage 专门测试内存使用情况
func BenchmarkMemoryUsage(b *testing.B) {
	server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
		rw.Write([]byte(`OK`))
	}))
	defer server.Close()

	// 禁用默认的测试时间，只关注内存分配
	b.ReportAllocs()

	var memStatsStart, memStatsEnd runtime.MemStats
	runtime.GC()
	runtime.ReadMemStats(&memStatsStart)

	for i := 0; i < b.N; i++ {
		resp, err := Get(server.URL, WithSkipTLSVerify(true))
		if err != nil {
			b.Errorf("Unexpected error: %v", err)
		}

		body := resp.Body().String()
		if body != "OK" {
			b.Errorf("Expected OK, got %v", body)
		}
	}

	runtime.GC()
	runtime.ReadMemStats(&memStatsEnd)

	// 计算每次操作的平均内存分配
	allocsPerOp := float64(memStatsEnd.Mallocs-memStatsStart.Mallocs) / float64(b.N)
	bytesPerOp := float64(memStatsEnd.TotalAlloc-memStatsStart.TotalAlloc) / float64(b.N)

	b.ReportMetric(allocsPerOp, "allocs/op")
	b.ReportMetric(bytesPerOp, "bytes/op")
}

// BenchmarkDifferentResponseSizes 测试不同响应大小的性能
func BenchmarkDifferentResponseSizes(b *testing.B) {
	// 测试不同大小的响应
	responseSizes := []int{100, 1024, 10240, 102400} // 100B, 1KB, 10KB, 100KB

	for _, size := range responseSizes {
		// 生成指定大小的响应数据
		responseData := make([]byte, size)
		for i := 0; i < size; i++ {
			responseData[i] = 'A'
		}

		b.Run(fmt.Sprintf("Size_%d", size), func(b *testing.B) {
			server := httptest.NewServer(http.HandlerFunc(func(rw http.ResponseWriter, req *http.Request) {
				rw.Write(responseData)
			}))
			defer server.Close()

			b.ResetTimer()
			b.ReportAllocs()

			for i := 0; i < b.N; i++ {
				resp, err := Get(server.URL, WithSkipTLSVerify(true))
				if err != nil {
					b.Errorf("Unexpected error: %v", err)
				}

				body := resp.Body().Bytes()
				if len(body) != size {
					b.Errorf("Expected size %d, got %d", size, len(body))
				}
			}
		})
	}
}