package service

import (
	"strconv"
	"testing"
)

var benchmarkStringSink string

// BenchmarkGenerateSessionHash_Metadata 关注 JSON 解析与正则匹配开销。
func BenchmarkGenerateSessionHash_Metadata(b *testing.B) {
	svc := &GatewayService{}
	body := []byte(`{"metadata":{"user_id":"session_123e4567-e89b-12d3-a456-426614174000"},"messages":[{"content":"hello"}]}`)

	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		parsed, err := ParseGatewayRequest(body)
		if err != nil {
			b.Fatalf("解析请求失败: %v", err)
		}
		benchmarkStringSink = svc.GenerateSessionHash(parsed)
	}
}

// BenchmarkExtractCacheableContent_System 关注字符串拼接路径的性能。
func BenchmarkExtractCacheableContent_System(b *testing.B) {
	svc := &GatewayService{}
	req := buildSystemCacheableRequest(12)

	b.ReportAllocs()
	for i := 0; i < b.N; i++ {
		benchmarkStringSink = svc.extractCacheableContent(req)
	}
}

func buildSystemCacheableRequest(parts int) *ParsedRequest {
	systemParts := make([]any, 0, parts)
	for i := 0; i < parts; i++ {
		systemParts = append(systemParts, map[string]any{
			"text": "system_part_" + strconv.Itoa(i),
			"cache_control": map[string]any{
				"type": "ephemeral",
			},
		})
	}
	return &ParsedRequest{
		System:    systemParts,
		HasSystem: true,
	}
}
