//go:build unit

package service

import (
	"context"
	"io"
	"net/http"
	"net/http/httptest"
	"regexp"
	"strings"
	"testing"

	"github.com/Wei-Shaw/sub2api/internal/config"
	"github.com/Wei-Shaw/sub2api/internal/pkg/claude"
	"github.com/gin-gonic/gin"
	"github.com/stretchr/testify/require"
	"github.com/tidwall/gjson"
)

// ============================================================================
// 背景
// ============================================================================
//
// Anthropic 上游对 body.context_management 字段实施 Pydantic schema 校验：
// 当且仅当 anthropic-beta header 含 context-management-2025-06-27 时接受。
// 否则报：
//   "context_management: Extra inputs are not permitted"
//
// 本仓采用能力维度对称约束（与 Bedrock 路径的 sanitizeBedrockFieldsForBetaTokens
// 对称）：在所有 Anthropic 直连出口，按最终 anthropic-beta header 是否含上述 token
// 决定 body 是否保留同名字段。
//
// 本文件覆盖：
//   1) sanitizeAnthropicBodyForBetaTokens 纯函数
//   2) anthropicBetaTokensContains 解析辅助函数
//   3) computeFinalAnthropicBeta / computeFinalCountTokensAnthropicBeta 各路径
//   4) normalizeClaudeOAuthRequestBody 的 context_management 补齐行为（不再按 model 短路）

// ============================================================================
// anthropicBetaTokensContains
// ============================================================================

func TestAnthropicBetaTokensContains_EmptyInputs(t *testing.T) {
	require.False(t, anthropicBetaTokensContains("", "context-management-2025-06-27"))
	require.False(t, anthropicBetaTokensContains("oauth-2025-04-20", ""))
}

func TestAnthropicBetaTokensContains_SingleToken(t *testing.T) {
	require.True(t, anthropicBetaTokensContains("context-management-2025-06-27", "context-management-2025-06-27"))
}

func TestAnthropicBetaTokensContains_MultiTokenComma(t *testing.T) {
	header := "oauth-2025-04-20,context-management-2025-06-27,interleaved-thinking-2025-05-14"
	require.True(t, anthropicBetaTokensContains(header, "context-management-2025-06-27"))
	require.True(t, anthropicBetaTokensContains(header, "oauth-2025-04-20"))
	require.False(t, anthropicBetaTokensContains(header, "fast-mode-2026-02-01"))
}

func TestAnthropicBetaTokensContains_ToleratesWhitespace(t *testing.T) {
	header := "oauth-2025-04-20 , context-management-2025-06-27 ,  interleaved-thinking-2025-05-14"
	require.True(t, anthropicBetaTokensContains(header, "context-management-2025-06-27"))
}

func TestAnthropicBetaTokensContains_SubstringNotMatched(t *testing.T) {
	// 严格 token 比较，不应被子串误匹配
	require.False(t, anthropicBetaTokensContains("context-management-2025-06-27-rev2", "context-management-2025-06-27"),
		"必须按 token 边界匹配，不允许 prefix 子串误命中")
}

// ============================================================================
// sanitizeAnthropicBodyForBetaTokens
// ============================================================================

func TestSanitizeAnthropicBodyForBetaTokens_NoFieldNoChange(t *testing.T) {
	body := []byte(`{"model":"claude-haiku-4-5","messages":[]}`)
	out, changed := sanitizeAnthropicBodyForBetaTokens(body, "oauth-2025-04-20")
	require.False(t, changed)
	require.Equal(t, string(body), string(out))
}

func TestSanitizeAnthropicBodyForBetaTokens_FieldKeptWhenBetaPresent(t *testing.T) {
	body := []byte(`{"model":"claude-opus-4-7","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	out, changed := sanitizeAnthropicBodyForBetaTokens(body,
		"oauth-2025-04-20,context-management-2025-06-27,interleaved-thinking-2025-05-14")
	require.False(t, changed)
	require.True(t, gjson.GetBytes(out, "context_management").Exists())
	require.Equal(t, "clear_thinking_20251015",
		gjson.GetBytes(out, "context_management.edits.0.type").String())
}

func TestSanitizeAnthropicBodyForBetaTokens_FieldStrippedWhenBetaMissing(t *testing.T) {
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	out, changed := sanitizeAnthropicBodyForBetaTokens(body, "oauth-2025-04-20,interleaved-thinking-2025-05-14")
	require.True(t, changed)
	require.False(t, gjson.GetBytes(out, "context_management").Exists(),
		"header 不含 context-management beta 时必须 strip 同名字段")
}

func TestSanitizeAnthropicBodyForBetaTokens_FieldStrippedWhenBetaEmpty(t *testing.T) {
	body := []byte(`{"context_management":{"edits":[]},"messages":[]}`)
	out, changed := sanitizeAnthropicBodyForBetaTokens(body, "")
	require.True(t, changed)
	require.False(t, gjson.GetBytes(out, "context_management").Exists())
}

func TestSanitizeAnthropicBodyForBetaTokens_EmptyBody(t *testing.T) {
	out, changed := sanitizeAnthropicBodyForBetaTokens([]byte{}, "")
	require.False(t, changed)
	require.Empty(t, out)

	out, changed = sanitizeAnthropicBodyForBetaTokens(nil, "")
	require.False(t, changed)
	require.Empty(t, out)
}

// ★ 关键回归断言：能力维度 sanitize 解决了 "真 CC + haiku" 路径的过度删除问题。
// 真实 Claude Code CLI 2.1.87+ 客户端 header 含 context-management beta；
// 即使 model 是 haiku，sanitize 也不应剥离功能字段。
func TestSanitizeAnthropicBodyForBetaTokens_HaikuRealCCClientPreservesField(t *testing.T) {
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015","keep":"all"}]},"messages":[]}`)
	// 真 Claude Code CLI 2.1.87+ 客户端 header 含 context-management beta
	clientBeta := "claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,context-management-2025-06-27"
	out, changed := sanitizeAnthropicBodyForBetaTokens(body, clientBeta)
	require.False(t, changed,
		"真 CC 客户端 header 含 context-management beta 时，haiku body 字段必须保留（功能不丢）")
	require.True(t, gjson.GetBytes(out, "context_management").Exists())
}

// ============================================================================
// computeFinalAnthropicBeta — 关键路径
// ============================================================================

func newTestGatewayServiceForBeta(injectBetaForAPIKey bool) *GatewayService {
	cfg := &config.Config{}
	cfg.Gateway.InjectBetaForAPIKey = injectBetaForAPIKey
	return &GatewayService{cfg: cfg}
}

func TestComputeFinalAnthropicBeta_OAuthMimic_NonHaiku_IncludesContextManagement(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	final, ok := s.computeFinalAnthropicBeta("oauth", true, "claude-sonnet-4-6", http.Header{}, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"OAuth mimic non-haiku 必须注入完整 CC mimicry beta，含 context-management-2025-06-27")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaOAuth))
	require.True(t, anthropicBetaTokensContains(final, claude.BetaClaudeCode))
}

func TestComputeFinalAnthropicBeta_OAuthMimic_Haiku_ExcludesContextManagement(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	final, ok := s.computeFinalAnthropicBeta("oauth", true, "claude-haiku-4-5", http.Header{}, []byte(`{}`), nil)
	require.True(t, ok)
	require.False(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"OAuth mimic haiku 仅注入 oauth + interleaved-thinking，不含 context-management")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaOAuth))
	require.True(t, anthropicBetaTokensContains(final, claude.BetaInterleavedThinking))
}

func TestComputeFinalAnthropicBeta_OAuthMimic_IgnoresClientBeta(t *testing.T) {
	// mimic 路径下原代码白名单透传被跳过，client beta 应被忽略
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "custom-experimental-beta")
	final, ok := s.computeFinalAnthropicBeta("oauth", true, "claude-sonnet-4-6", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.False(t, strings.Contains(final, "custom-experimental-beta"),
		"mimic 路径必须忽略客户端 anthropic-beta header")
}

func TestComputeFinalAnthropicBeta_OAuthTransparent_NonHaiku_PreservesClientContextManagement(t *testing.T) {
	// 真 CC 客户端透传：客户端 header 中的 context-management beta 必须保留
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "claude-code-20250219,oauth-2025-04-20,context-management-2025-06-27")
	final, ok := s.computeFinalAnthropicBeta("oauth", false, "claude-sonnet-4-6", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement))
}

func TestComputeFinalAnthropicBeta_OAuthTransparent_Haiku_RealCCPreservesContextManagement(t *testing.T) {
	// haiku 透传 + 客户端带 context-management beta → 必须保留
	// （能力维度核心场景：避免 model-name 误删客户端透传的功能 beta）
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "claude-code-20250219,oauth-2025-04-20,context-management-2025-06-27,interleaved-thinking-2025-05-14")
	final, ok := s.computeFinalAnthropicBeta("oauth", false, "claude-haiku-4-5", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"真 CC + haiku + 客户端带 context-management beta → 透传必须保留")
}

func TestComputeFinalAnthropicBeta_APIKey_PassesClientBetaThroughDropSet(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "oauth-2025-04-20,custom-beta")
	final, ok := s.computeFinalAnthropicBeta("apikey", false, "claude-sonnet-4-6", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, "oauth-2025-04-20"))
	require.True(t, anthropicBetaTokensContains(final, "custom-beta"))
}

func TestComputeFinalAnthropicBeta_APIKey_NoClientBetaInjectOff_ShouldNotSet(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	final, ok := s.computeFinalAnthropicBeta("apikey", false, "claude-sonnet-4-6", http.Header{}, []byte(`{}`), nil)
	require.False(t, ok, "API-key + 客户端未传 + InjectBetaForAPIKey 关 → 不应主动设置 anthropic-beta")
	require.Equal(t, "", final)
}

// ============================================================================
// computeFinalCountTokensAnthropicBeta
// ============================================================================

func TestComputeFinalCountTokensAnthropicBeta_OAuthMimic_AlwaysIncludesContextManagement(t *testing.T) {
	// count_tokens 路径下 mimic 不按 haiku 排除：始终注入完整 mimicry beta
	s := newTestGatewayServiceForBeta(false)
	final, ok := s.computeFinalCountTokensAnthropicBeta("oauth", true, "claude-haiku-4-5", http.Header{}, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"count_tokens + mimic 即使 haiku 也注入 context-management beta（与 messages 不同）")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaTokenCounting),
		"count_tokens 路径必须含 token-counting beta")
}

// 重构等价性回归：
// 原 main buildCountTokensRequest 在 count_tokens mimic 分支上不跳过白名单透传
// （与 messages mimic 不同），incomingBeta 取自客户端透传。重构后必须从 clientHeaders
// 拿同一个值并 merge，否则会丢失客户端 beta。
func TestComputeFinalCountTokensAnthropicBeta_OAuthMimic_PreservesClientBeta(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "custom-experimental-beta,context-1m-2025-08-07")
	final, ok := s.computeFinalCountTokensAnthropicBeta("oauth", true, "claude-haiku-4-5", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, "custom-experimental-beta"),
		"count_tokens mimic 不同于 messages mimic：原代码会保留客户端透传的 beta")
	require.True(t, anthropicBetaTokensContains(final, "context-1m-2025-08-07"),
		"客户端透传的其他 beta token 同样需要保留")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"同时 FullClaudeCodeMimicryBetas 不打折扣")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaTokenCounting),
		"同时补齐 token-counting beta")
}

// messages mimic 路径反向验证：原代码会跳过白名单透传，
// 客户端 beta 不会进入 mimic 计算。重构后 messages computeFinalAnthropicBeta
// mimic 分支依然不该使用 clientBeta。
func TestComputeFinalAnthropicBeta_OAuthMimic_IgnoresClientBetaExplicit(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "custom-experimental-beta")
	final, ok := s.computeFinalAnthropicBeta("oauth", true, "claude-sonnet-4-6", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.False(t, anthropicBetaTokensContains(final, "custom-experimental-beta"),
		"messages mimic 原代码跳过白名单透传 → 客户端 beta 不进入计算。"+
			"与 count_tokens mimic 是不同的设计，不能合并为同一函数。")
}

func TestComputeFinalCountTokensAnthropicBeta_OAuthTransparent_NoClientBetaInjectsDefault(t *testing.T) {
	// 真 CC 客户端透传 + 客户端未传 anthropic-beta → 用 CountTokensBetaHeader 兜底
	s := newTestGatewayServiceForBeta(false)
	final, ok := s.computeFinalCountTokensAnthropicBeta("oauth", false, "claude-haiku-4-5", http.Header{}, []byte(`{}`), nil)
	require.True(t, ok)
	require.Equal(t, claude.CountTokensBetaHeader, final)
	// CountTokensBetaHeader 不含 context-management beta
	require.False(t, anthropicBetaTokensContains(final, claude.BetaContextManagement))
}

func TestComputeFinalCountTokensAnthropicBeta_OAuthTransparent_AppendsBetaTokenCounting(t *testing.T) {
	s := newTestGatewayServiceForBeta(false)
	hdr := http.Header{}
	hdr.Set("anthropic-beta", "oauth-2025-04-20,context-management-2025-06-27")
	final, ok := s.computeFinalCountTokensAnthropicBeta("oauth", false, "claude-sonnet-4-6", hdr, []byte(`{}`), nil)
	require.True(t, ok)
	require.True(t, anthropicBetaTokensContains(final, claude.BetaTokenCounting),
		"客户端未带 token-counting beta 时必须补齐")
	require.True(t, anthropicBetaTokensContains(final, claude.BetaContextManagement),
		"客户端带的 context-management beta 必须保留")
}

// ============================================================================
// normalizeClaudeOAuthRequestBody — 回归：context_management 补齐恢复原行为
// ============================================================================
//
// 重构后该函数不再按 model 名短路：thinking=enabled/adaptive 时补齐 context_management，
// 与 model 无关。strip 责任移交 sanitizeAnthropicBodyForBetaTokens（在
// buildUpstreamRequest 层按最终 beta header 执行）。

func TestNormalizeClaudeOAuthRequestBody_InjectsContextManagement_ThinkingEnabled(t *testing.T) {
	body := []byte(`{"model":"claude-sonnet-4-6","thinking":{"type":"enabled","budget_tokens":1000},"messages":[]}`)
	out, _ := normalizeClaudeOAuthRequestBody(body, "claude-sonnet-4-6", claudeOAuthNormalizeOptions{})
	require.True(t, gjson.GetBytes(out, "context_management").Exists())
	require.Equal(t, "clear_thinking_20251015",
		gjson.GetBytes(out, "context_management.edits.0.type").String())
}

func TestNormalizeClaudeOAuthRequestBody_InjectsContextManagement_ThinkingAdaptive(t *testing.T) {
	body := []byte(`{"model":"claude-opus-4-7","thinking":{"type":"adaptive"},"messages":[]}`)
	out, _ := normalizeClaudeOAuthRequestBody(body, "claude-opus-4-7", claudeOAuthNormalizeOptions{})
	require.True(t, gjson.GetBytes(out, "context_management").Exists())
}

func TestNormalizeClaudeOAuthRequestBody_HaikuStillInjects_StripDeferredToSanitize(t *testing.T) {
	// haiku + thinking=enabled：normalize 阶段仍按 CLI mimicry 行为补齐字段；
	// strip 由 buildUpstreamRequest 层的 sanitize 兜底（如果 final beta 不含 token）。
	body := []byte(`{"model":"claude-haiku-4-5","thinking":{"type":"enabled","budget_tokens":1000},"messages":[]}`)
	out, _ := normalizeClaudeOAuthRequestBody(body, "claude-haiku-4-5", claudeOAuthNormalizeOptions{})
	require.True(t, gjson.GetBytes(out, "context_management").Exists(),
		"normalize 不再按 model 名短路；strip 责任移交 sanitize 层")
}

func TestNormalizeClaudeOAuthRequestBody_PreservesClientContextManagement(t *testing.T) {
	body := []byte(`{"model":"claude-opus-4-7","context_management":{"edits":[{"type":"custom_strategy"}]},"thinking":{"type":"enabled","budget_tokens":1000},"messages":[]}`)
	out, _ := normalizeClaudeOAuthRequestBody(body, "claude-opus-4-7", claudeOAuthNormalizeOptions{})
	require.Equal(t, "custom_strategy",
		gjson.GetBytes(out, "context_management.edits.0.type").String(),
		"客户端透传的 context_management 内容必须原样保留")
}

func TestNormalizeClaudeOAuthRequestBody_NoThinking_NoInject(t *testing.T) {
	body := []byte(`{"model":"claude-sonnet-4-6","messages":[]}`)
	out, _ := normalizeClaudeOAuthRequestBody(body, "claude-sonnet-4-6", claudeOAuthNormalizeOptions{})
	require.False(t, gjson.GetBytes(out, "context_management").Exists())
}

// ============================================================================
// passthrough 集成测试：buildUpstreamRequest-
// AnthropicAPIKeyPassthrough 与 buildCountTokensRequestAnthropicAPIKeyPassthrough
// 路径上 sanitize 是否生效。
// ============================================================================

// passthrough 集成测试不设 base_url，避开 validateUpstreamBaseURL 对 cfg.Security 的依赖。
// targetURL 会走默认 claudeAPIURL，sanitize 逻辑与 baseURL 是否存在无关。
func newAnthropicAPIKeyPassthroughAccountForBetaTest() *Account {
	return &Account{
		ID:       501,
		Name:     "anthropic-apikey-passthrough-ctxmgmt-test",
		Platform: PlatformAnthropic,
		Type:     AccountTypeAPIKey,
		Credentials: map[string]any{
			"api_key": "upstream-key",
		},
		Extra:       map[string]any{"anthropic_passthrough": true},
		Status:      StatusActive,
		Schedulable: true,
	}
}

func readUpstreamBodyForTest(t *testing.T, req *http.Request) []byte {
	t.Helper()
	require.NotNil(t, req.Body)
	b, err := io.ReadAll(req.Body)
	require.NoError(t, err)
	return b
}

func TestBuildUpstreamRequestAnthropicAPIKeyPassthrough_StripsContextManagementWhenClientHeaderMissingBeta(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)
	// 客户端仅带 oauth beta，不带 context-management-2025-06-27
	c.Request.Header.Set("Anthropic-Beta", "oauth-2025-04-20")

	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequestAnthropicAPIKeyPassthrough(
		context.Background(), c, newAnthropicAPIKeyPassthroughAccountForBetaTest(), body, "token",
	)
	require.NoError(t, err)
	require.False(t, gjson.GetBytes(readUpstreamBodyForTest(t, req), "context_management").Exists(),
		"API-key passthrough + 客户端未带 context-management beta → strip body 字段")
}

func TestBuildUpstreamRequestAnthropicAPIKeyPassthrough_PreservesContextManagementWhenClientHeaderHasBeta(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)
	c.Request.Header.Set("Anthropic-Beta", "oauth-2025-04-20,context-management-2025-06-27")

	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequestAnthropicAPIKeyPassthrough(
		context.Background(), c, newAnthropicAPIKeyPassthroughAccountForBetaTest(), body, "token",
	)
	require.NoError(t, err)
	require.True(t, gjson.GetBytes(readUpstreamBodyForTest(t, req), "context_management").Exists(),
		"API-key passthrough + 客户端带 context-management beta → 字段保留（不过度删除）")
}

func TestBuildCountTokensRequestAnthropicAPIKeyPassthrough_StripsContextManagementWhenClientHeaderMissingBeta(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", nil)
	c.Request.Header.Set("Anthropic-Beta", "oauth-2025-04-20,token-counting-2024-11-01")

	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildCountTokensRequestAnthropicAPIKeyPassthrough(
		context.Background(), c, newAnthropicAPIKeyPassthroughAccountForBetaTest(), body, "token",
	)
	require.NoError(t, err)
	require.False(t, gjson.GetBytes(readUpstreamBodyForTest(t, req), "context_management").Exists(),
		"count_tokens passthrough + 客户端未带 context-management beta → strip")
}

// ============================================================================
// 集成测试：buildUpstreamRequest
// 全路径验证上游 outgoing body 与 anthropic-beta header 严格对称。
// 这个测试能挡住未来某人忘调 sanitize / 将 sanitize 挪到 CCH 之后 等 regression。
// ============================================================================

func TestBuildUpstreamRequest_OAuthMimicHaiku_StripsContextManagementEndToEnd(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)

	account := &Account{ID: 401, Platform: PlatformAnthropic, Type: AccountTypeOAuth,
		Credentials: map[string]any{"access_token": "oauth-tok"},
		Status:      StatusActive,
		Schedulable: true,
	}
	// haiku + mimic CC → final beta = HaikuBetaHeader（不含 context-management）→
	// body 必须 strip。
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequest(
		context.Background(), c, account, body,
		"oauth-tok", "oauth", "claude-haiku-4-5", false, true, // mimicClaudeCode=true
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	outBeta := getHeaderRaw(req.Header, "anthropic-beta")

	require.False(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"OAuth mimic + haiku 端到端：outgoing body 不应含 context_management")
	require.False(t, anthropicBetaTokensContains(outBeta, claude.BetaContextManagement),
		"对称约束：outgoing anthropic-beta header 也不带 context-management beta")
}

func TestBuildUpstreamRequest_OAuthMimicNonHaiku_PreservesContextManagementEndToEnd(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)

	account := &Account{ID: 402, Platform: PlatformAnthropic, Type: AccountTypeOAuth,
		Credentials: map[string]any{"access_token": "oauth-tok"},
		Status:      StatusActive,
		Schedulable: true,
	}
	// sonnet + mimic CC → final beta = FullClaudeCodeMimicryBetas（含 context-management）→
	// body 保留。
	body := []byte(`{"model":"claude-sonnet-4-6","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequest(
		context.Background(), c, account, body,
		"oauth-tok", "oauth", "claude-sonnet-4-6", false, true,
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	outBeta := getHeaderRaw(req.Header, "anthropic-beta")

	require.True(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"OAuth mimic + non-haiku：outgoing body 必须保留 context_management。")
	require.True(t, anthropicBetaTokensContains(outBeta, claude.BetaContextManagement),
		"对称约束：outgoing anthropic-beta header 同时含 context-management beta")
}

func TestBuildUpstreamRequest_OAuthTransparentHaikuWithRealCCBeta_PreservesField(t *testing.T) {
	// 端到端验证：真 CC 客户端 + haiku + 客户端 header 带 context-management beta
	// → final beta 透传 → 不应该过度删除 body 字段
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)
	c.Request.Header.Set("Anthropic-Beta",
		"claude-code-20250219,oauth-2025-04-20,interleaved-thinking-2025-05-14,context-management-2025-06-27")

	account := &Account{ID: 403, Platform: PlatformAnthropic, Type: AccountTypeOAuth,
		Credentials: map[string]any{"access_token": "oauth-tok"},
		Status:      StatusActive, Schedulable: true,
	}
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015","keep":"all"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequest(
		context.Background(), c, account, body,
		"oauth-tok", "oauth", "claude-haiku-4-5", false, false, // mimicClaudeCode=false（真 CC）
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	outBeta := getHeaderRaw(req.Header, "anthropic-beta")

	require.True(t, anthropicBetaTokensContains(outBeta, claude.BetaContextManagement),
		"真 CC 透传路径：客户端 header 中的 context-management beta 必须保留")
	require.True(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"回归保护：真 CC + haiku + 客户端带 beta token 时，clear_thinking_20251015 功能不能静默失效")
}

// CCH 顺序语义测试：sanitize 必须在 signBillingHeaderCCH 之前，
// 否则签名的 hash 与最终发送的 body 不一致，被 Anthropic 判 third-party。
//
// 该测试不走 buildUpstreamRequest 完整路径（需要 mock SettingService 成本高），
// 而是直接验证两个顺序产生的 cch 不同，证明二者不可交换。
// 测试名本身是语义约束的文档化 marker。
func TestSanitizeMustBeBeforeCCHSigning_HashConsistency(t *testing.T) {
	// 构造 body：含 context_management + cch=00000 占位符
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"system":[{"type":"text","text":"x-anthropic-billing-header: cc_version=2.1.92; cch=00000;"}],"messages":[]}`)

	// 最终发送场景：final beta 不含 context-management beta → sanitize 会 strip
	finalBeta := "oauth-2025-04-20,interleaved-thinking-2025-05-14"

	extractCCH := func(t *testing.T, b []byte) string {
		t.Helper()
		m := regexp.MustCompile(`\bcch=([0-9a-fA-F]{5})\b`).FindSubmatch(b)
		require.NotNil(t, m, "body 里找不到 cch=<5hex> ：%s", string(b))
		return string(m[1])
	}

	// === 正确顺序：sanitize → signBillingHeaderCCH ===
	// 1. strip context_management
	sanitizedFirst, changed := sanitizeAnthropicBodyForBetaTokens(body, finalBeta)
	require.True(t, changed)
	require.False(t, gjson.GetBytes(sanitizedFirst, "context_management").Exists())
	// 2. 基于“strip 后的 body”算 hash
	correctFinal := signBillingHeaderCCH(sanitizedFirst)
	correctCCH := extractCCH(t, correctFinal)
	require.NotEqual(t, "00000", correctCCH, "placeholder 应被替换")

	// === 错误顺序：signBillingHeaderCCH → sanitize（未来 regression 场景）===
	// 1. 先基于“含 context_management 的 body”算 hash → cch=H_with
	signedFirst := signBillingHeaderCCH(body)
	wrongCCH := extractCCH(t, signedFirst)
	require.NotEqual(t, "00000", wrongCCH)
	// 2. 后 strip context_management → body 变化但 cch 仍是 H_with
	wrongFinal, _ := sanitizeAnthropicBodyForBetaTokens(signedFirst, finalBeta)
	wrongFinalCCH := extractCCH(t, wrongFinal)

	// === 关键断言 ===
	// 上游验证逻辑：将 outgoing body 的 cch 还原为 00000、重算 hash、与 cch 字段比较。
	// 模拟上游验证：用发送 body 算出“期望的 cch”，与发送 body 里的 cch 字段比。
	recomputeExpected := func(b []byte, currentCCH string) string {
		t.Helper()
		// 把 cch=<currentCCH> 还原为 cch=00000
		re := regexp.MustCompile(`(\bcch=)` + currentCCH + `(\b)`)
		restored := re.ReplaceAll(b, []byte("${1}00000${2}"))
		return extractCCH(t, signBillingHeaderCCH(restored))
	}

	// 正确顺序：发送 body 的 cch == 重算 hash → 上游验证过
	require.Equal(t, correctCCH, recomputeExpected(correctFinal, correctCCH),
		"正确顺序：final body 里的 cch 与重算 hash 一致 → 上游验证通过")

	// 错误顺序：发送 body 的 cch 是“含 ctx 算的”，但最终 body 不含 ctx → 重算 hash 不同
	require.NotEqual(t, wrongFinalCCH, recomputeExpected(wrongFinal, wrongFinalCCH),
		"错误顺序：final body 里的 cch 是基于含 ctx 的 body 算的，"+
			"但发送 body 已 strip ctx → 上游重算 hash 与 cch 不一致 → 被判 third-party。"+
			"这是 buildUpstreamRequest / buildCountTokensRequest 里 sanitize 必须在 "+
			"signBillingHeaderCCH 之前的原因。")
}

// count_tokens 主路径 E2E 集成测试
func TestBuildCountTokensRequest_OAuthMimicHaiku_PreservesContextManagementEndToEnd(t *testing.T) {
	// count_tokens 路径下 mimic 不按 haiku 排除，始终注入 BetaContextManagement
	// → sanitize 看到最终 beta header 含 context-management beta → 字段保留。
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", nil)

	account := &Account{ID: 411, Platform: PlatformAnthropic, Type: AccountTypeOAuth,
		Credentials: map[string]any{"access_token": "oauth-tok"},
		Status:      StatusActive, Schedulable: true,
	}
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildCountTokensRequest(
		context.Background(), c, account, body,
		"oauth-tok", "oauth", "claude-haiku-4-5", true, // mimicClaudeCode=true
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	outBeta := getHeaderRaw(req.Header, "anthropic-beta")

	require.True(t, anthropicBetaTokensContains(outBeta, claude.BetaContextManagement),
		"count_tokens mimic 始终注入 context-management beta")
	require.True(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"对称约束：final beta 含 token 时 body 字段保留")
	require.True(t, anthropicBetaTokensContains(outBeta, claude.BetaTokenCounting),
		"count_tokens 路径必须含 token-counting beta")
}

func TestBuildCountTokensRequest_APIKeyHaiku_StripsContextManagementEndToEnd(t *testing.T) {
	// API-key + haiku + 客户端 header 不带 context-management beta → final beta 不含 → strip
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", nil)
	c.Request.Header.Set("Anthropic-Beta", "interleaved-thinking-2025-05-14")

	account := &Account{ID: 412, Platform: PlatformAnthropic, Type: AccountTypeAPIKey,
		Credentials: map[string]any{"api_key": "sk-ant-xxx"},
		Status:      StatusActive, Schedulable: true,
	}
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildCountTokensRequest(
		context.Background(), c, account, body,
		"sk-ant-xxx", "apikey", "claude-haiku-4-5", false,
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	require.False(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"count_tokens API-key + 客户端未带 beta token → body strip")
}

// count_tokens passthrough preserve 测试
func TestBuildCountTokensRequestAnthropicAPIKeyPassthrough_PreservesContextManagementWhenClientHeaderHasBeta(t *testing.T) {
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages/count_tokens", nil)
	c.Request.Header.Set("Anthropic-Beta", "oauth-2025-04-20,context-management-2025-06-27,token-counting-2024-11-01")

	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[{"type":"clear_thinking_20251015"}]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildCountTokensRequestAnthropicAPIKeyPassthrough(
		context.Background(), c, newAnthropicAPIKeyPassthroughAccountForBetaTest(), body, "token",
	)
	require.NoError(t, err)
	require.True(t, gjson.GetBytes(readUpstreamBodyForTest(t, req), "context_management").Exists(),
		"count_tokens passthrough + 客户端带 context-management beta → 字段保留")
}

func TestBuildUpstreamRequest_APIKeyHaikuWithContextManagement_StripsField(t *testing.T) {
	// API-key + haiku + body 带 context_management + 客户端 header 未带 context-management beta
	// → final beta 不含 → body 字段被 strip
	gin.SetMode(gin.TestMode)
	rec := httptest.NewRecorder()
	c, _ := gin.CreateTestContext(rec)
	c.Request = httptest.NewRequest(http.MethodPost, "/v1/messages", nil)
	c.Request.Header.Set("Anthropic-Beta", "interleaved-thinking-2025-05-14")

	account := &Account{ID: 404, Platform: PlatformAnthropic, Type: AccountTypeAPIKey,
		Credentials: map[string]any{"api_key": "sk-ant-xxx"},
		Status:      StatusActive, Schedulable: true,
	}
	body := []byte(`{"model":"claude-haiku-4-5","context_management":{"edits":[]},"messages":[]}`)
	svc := &GatewayService{cfg: &config.Config{}}
	req, err := svc.buildUpstreamRequest(
		context.Background(), c, account, body,
		"sk-ant-xxx", "apikey", "claude-haiku-4-5", false, false,
	)
	require.NoError(t, err)

	outBody := readUpstreamBodyForTest(t, req)
	require.False(t, gjson.GetBytes(outBody, "context_management").Exists(),
		"API-key + haiku + 客户端未带 beta token → body 字段必须被 strip")
}