// Copyright 2026 Alibaba Group
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

package app

import (
	"context"
	"crypto/rand"
	"encoding/hex"
	"encoding/json"
	"errors"
	"fmt"
	"io"
	"log/slog"
	"net/http"
	"os"
	"strings"
	"sync"
	"time"

	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/audit"
	authpkg "github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/auth"
	apperrors "github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/errors"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/executor"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/logging"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/safety"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/internal/transport"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/pkg/agentproduct"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/pkg/configmeta"
	"github.com/DingTalk-Real-AI/dingtalk-workspace-cli/pkg/edition"
)

func init() {
	runnerHandlePatAuthCheck = handlePatAuthCheck
	runnerRetryWithPatAuthRetry = retryWithPatAuthRetry

	configmeta.Register(configmeta.ConfigItem{
		Name:        "DWS_RUNTIME_CONTENT_SCAN",
		Category:    configmeta.CategoryRuntime,
		Description: "启用 MCP 响应内容安全扫描",
		Example:     "true",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DWS_RUNTIME_CONTENT_SCAN_ENFORCE",
		Category:    configmeta.CategoryRuntime,
		Description: "内容安全扫描发现问题时阻断响应",
		Example:     "true",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DWS_RUNTIME_CONTENT_SCAN_REPORT",
		Category:    configmeta.CategoryRuntime,
		Description: "在 JSON 输出中包含安全扫描报告",
		Example:     "true",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DINGTALK_AGENT",
		Category:    configmeta.CategoryExternal,
		Description: "业务 Agent 名称；仅用于 x-dingtalk-agent 请求头，与 claw-type/host-owned PAT 判定无关",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DINGTALK_TRACE_ID",
		Category:    configmeta.CategoryExternal,
		Description: "MCP 请求 x-dingtalk-trace-id 头",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DINGTALK_SESSION_ID",
		Category:    configmeta.CategoryExternal,
		Description: "MCP 请求 x-dingtalk-session-id 头",
	})
	configmeta.Register(configmeta.ConfigItem{
		Name:        "DINGTALK_MESSAGE_ID",
		Category:    configmeta.CategoryExternal,
		Description: "MCP 请求 x-dingtalk-message-id 头",
	})
}

const (
	runtimeContentScanEnv             = "DWS_RUNTIME_CONTENT_SCAN"
	runtimeContentScanEnforceEnv      = "DWS_RUNTIME_CONTENT_SCAN_ENFORCE"
	runtimeContentScanReportOutputEnv = "DWS_RUNTIME_CONTENT_SCAN_REPORT"

	// Environment variables for MCP request headers (passed from caller)
	envDingtalkAgent     = "DINGTALK_AGENT"
	envDingtalkTraceID   = "DINGTALK_TRACE_ID"
	envDingtalkSessionID = "DINGTALK_SESSION_ID"
	envDingtalkMessageID = "DINGTALK_MESSAGE_ID"
	envDWSSessionID      = "DWS_SESSION_ID"
	envRewindSessionID   = "REWIND_SESSION_ID"

	// Environment variables for third-party channel integration
	envDWSChannel = "DWS_CHANNEL"
)

// hostOwnedPATDecisionOnce ensures the host-owned PAT decision is logged at
// most once per CLI process. The log line is emitted at Debug level so
// `--debug` (or `--verbose`) surfaces it on stderr; the file logger at
// ~/.dws/logs/dws.log captures it unconditionally at DEBUG. It records
// ONLY the derived booleans — never the env value, token, client-id or
// flow-id — so logs remain safe to attach to issues.
var hostOwnedPATDecisionOnce sync.Once

// logHostOwnedPATDecisionOnce emits the single-shot debug trace. It is
// called lazily from the runtime Run path (which executes AFTER
// PersistentPreRunE has applied --debug / --verbose via configureLogLevel)
// so the line actually surfaces when the user asks for it.
func logHostOwnedPATDecisionOnce() {
	hostOwnedPATDecisionOnce.Do(func() {
		slog.Debug("runtime.host_owned_pat",
			"hostOwned", authpkg.HostOwnsPATFlow(),
			"agentCodeEnvPresent", authpkg.AgentCodeEnvPresent(),
		)
	})
}

func newCommandRunnerWithFlags(flags *GlobalFlags) executor.Runner {
	// Ensure DWS_CLIENT_ID env is populated from persisted config before
	// resolveIdentityHeaders reads it.  This covers fresh-process cold starts
	// where no env var has been inherited from a parent process.
	if os.Getenv("DWS_CLIENT_ID") == "" {
		if cid := authpkg.ClientID(); cid != "" {
			_ = os.Setenv("DWS_CLIENT_ID", cid)
		}
	}

	var httpClient *http.Client
	if flags != nil && flags.Timeout > 0 {
		httpClient = &http.Client{Timeout: time.Duration(flags.Timeout) * time.Second}
	}
	transportClient := transport.NewClient(httpClient)
	transportClient.FileLogger = FileLoggerInstance()
	return &runtimeRunner{
		transport:          transportClient,
		globalFlags:        flags,
		scanner:            newRuntimeContentScanner(),
		enforceContentScan: runtimeFlagEnabled(os.Getenv(runtimeContentScanEnforceEnv), false),
		includeScanReport:  runtimeFlagEnabled(os.Getenv(runtimeContentScanReportOutputEnv), false),
	}
}

type runtimeRunner struct {
	transport          *transport.Client
	globalFlags        *GlobalFlags
	fallback           executor.Runner
	scanner            safety.Scanner
	enforceContentScan bool
	includeScanReport  bool
	auditSink          audit.Sink
	agentMetadata      *agentMetadataSnapshot
}

var (
	runnerResolveMultiProfileSelections = resolveMultiProfileSelections
	runnerResolveProfile                = authpkg.ResolveProfile
	runnerGetCachedRuntimeToken         = getCachedRuntimeToken
	runnerResolveAuthSnapshot           = (*runtimeRunner).resolveAuthSnapshot
	runnerPreflightDocDownload          = (*runtimeRunner).preflightDocDownload
	runnerCallTool                      = (*transport.Client).CallTool
	runnerStdioEnsureInitialized        = (*transport.StdioClient).EnsureInitialized
	runnerStdioListTools                = (*transport.StdioClient).ListTools
	runnerStdioCallTool                 = (*transport.StdioClient).CallTool
	runnerHandlePatAuthCheck            func(context.Context, *runtimeRunner, executor.Invocation, *apperrors.PATError, string, io.Writer) (executor.Result, error)
	runnerRetryWithPatAuthRetry         func(context.Context, executor.Runner, executor.Invocation, *PatScopeError, string, io.Writer) (executor.Result, error)
	runnerCaptureRuntimeFailure         = captureRuntimeFailure
)

func (r *runtimeRunner) Run(ctx context.Context, invocation executor.Invocation) (executor.Result, error) {
	// Global dry-run is an execution barrier, not merely a transport option.
	// Return a deterministic local preview before profile resolution, catalog
	// discovery, Keychain/token prefetch, auth, stateful preflight or transport.
	// Use the non-injectable EchoRunner rather than r.fallback so tests and
	// edition overlays cannot accidentally turn this path into real execution.
	if invocation.DryRun || (r != nil && r.globalFlags != nil && r.globalFlags.DryRun) {
		invocation.DryRun = true
		return (executor.EchoRunner{}).Run(ctx, invocation)
	}
	if r == nil {
		return executor.Result{}, fmt.Errorf("runtime runner is not configured")
	}
	// Emit the one-shot host-owned PAT decision log. Placed here (not in
	// the constructor) so it fires AFTER PersistentPreRunE has configured
	// slog level per --debug / --verbose. The Once guard makes repeat
	// invocations within the same process free.
	logHostOwnedPATDecisionOnce()

	rawProfile := authpkg.RuntimeProfile()
	selections, multi, err := runnerResolveMultiProfileSelections(defaultConfigDir(), rawProfile)
	if err != nil {
		return executor.Result{}, apperrors.NewValidation(err.Error())
	}
	if multi {
		return r.runMultiProfile(ctx, invocation, selections)
	}
	if strings.TrimSpace(rawProfile) != "" {
		profile, err := runnerResolveProfile(defaultConfigDir(), rawProfile)
		if err != nil {
			return executor.Result{}, apperrors.NewValidation(err.Error())
		}
		if profile == nil {
			return executor.Result{}, apperrors.NewValidation(fmt.Sprintf("profile %q not found", rawProfile))
		}
		resolvedSelector := profileRuntimeSelector(*profile, rawProfile)
		authpkg.SetRuntimeProfile(resolvedSelector)
		defer authpkg.SetRuntimeProfile(rawProfile)
	}

	return r.runSingle(ctx, invocation, true)
}

// RunReadOnly executes one already-classified read lookup for a semantic
// Shortcut that is building a dry-run plan. It clones the runtime flags and
// clears DryRun only on that clone: the process-wide caller and every ordinary
// ToolCaller invocation retain the global execution barrier.
func (r *runtimeRunner) RunReadOnly(ctx context.Context, invocation executor.Invocation) (executor.Result, error) {
	if r == nil {
		return executor.Result{}, fmt.Errorf("runtime runner is not configured")
	}
	clone := *r
	if r.globalFlags != nil {
		flags := *r.globalFlags
		flags.DryRun = false
		clone.globalFlags = &flags
	}
	invocation.DryRun = false
	return clone.Run(ctx, invocation)
}

func (r *runtimeRunner) runSingle(ctx context.Context, invocation executor.Invocation, prefetchToken bool) (executor.Result, error) {
	if r.transport == nil {
		return r.fallback.Run(ctx, invocation)
	}

	// Mock mode: skip endpoint resolution, use a placeholder endpoint.
	if r.globalFlags != nil && r.globalFlags.Mock {
		endpoint := fmt.Sprintf("https://mock-mcp-%s.dingtalk.com", invocation.CanonicalProduct)
		if override, ok := productEndpointOverride(invocation.CanonicalProduct); ok {
			endpoint = override
		}
		return r.executeInvocation(ctx, endpoint, invocation)
	}

	// Prefetch the Keychain token in the background. Keychain access costs
	// ~70ms on macOS; starting it here lets the load overlap with endpoint
	// resolution below.
	if prefetchToken {
		go func() {
			_, _ = runnerGetCachedRuntimeToken(ctx)
		}()
	}

	if shouldUseDirectRuntime(invocation) {
		if endpoint, ok := directRuntimeEndpoint(invocation.CanonicalProduct, invocation.Tool); ok {
			return r.executeInvocation(ctx, endpoint, invocation)
		}
	}

	// Discovery is retired: endpoint resolution is the dynamic server
	// registry only, so a direct-runtime miss is terminal.
	return r.handleCatalogMiss(ctx, invocation, "no dynamic endpoint registered for product or tool")
}

// profileRuntimeSelector resolves the runtime profile selector for an
// invocation. It preserves a unique local-name selector for an unresolved
// account (empty UserID): reducing it to corpId can select a different exact
// account through the organization's current-account pointer. Shared by the
// single-profile path in Run and the multi-profile path in runMultiProfile.
func profileRuntimeSelector(profile authpkg.Profile, rawSelector string) string {
	if strings.TrimSpace(profile.UserID) == "" {
		return rawSelector
	}
	return authpkg.ProfileSelector(profile)
}

type multiProfileSelection struct {
	Selector string
	Profile  authpkg.Profile
}

func resolveMultiProfileSelections(configDir, rawSelector string) ([]multiProfileSelection, bool, error) {
	rawSelector = strings.TrimSpace(rawSelector)
	if rawSelector == "" || !strings.Contains(rawSelector, ",") {
		return nil, false, nil
	}
	if p, err := runnerResolveProfile(configDir, rawSelector); err == nil && p != nil {
		return nil, false, nil
	}

	parts := strings.Split(rawSelector, ",")
	selections := make([]multiProfileSelection, 0, len(parts))
	seen := make(map[string]bool, len(parts))
	for _, part := range parts {
		selector := strings.TrimSpace(part)
		if selector == "" {
			return nil, false, fmt.Errorf("--profile contains an empty profile selector: %q", rawSelector)
		}
		profile, err := runnerResolveProfile(configDir, selector)
		if err != nil {
			return nil, false, err
		}
		if profile == nil {
			return nil, false, fmt.Errorf("profile %q not found", selector)
		}
		identitySelector := authpkg.ProfileSelector(*profile)
		if seen[identitySelector] {
			continue
		}
		seen[identitySelector] = true
		selections = append(selections, multiProfileSelection{
			Selector: selector,
			Profile:  *profile,
		})
	}
	return selections, true, nil
}

func (r *runtimeRunner) runMultiProfile(ctx context.Context, invocation executor.Invocation, selections []multiProfileSelection) (executor.Result, error) {
	previousProfile := authpkg.RuntimeProfile()
	defer authpkg.SetRuntimeProfile(previousProfile)

	entries := make([]any, 0, len(selections))
	succeeded := 0
	failed := 0

	for _, selection := range selections {
		resolvedSelector := profileRuntimeSelector(selection.Profile, selection.Selector)
		authpkg.SetRuntimeProfile(resolvedSelector)
		result, err := r.runSingle(ctx, cloneInvocation(invocation), false)

		entry := map[string]any{
			"selector": selection.Selector,
			"profile":  resolvedSelector,
			"corpId":   selection.Profile.CorpID,
			"corpName": selection.Profile.CorpName,
			"userId":   selection.Profile.UserID,
			"userName": selection.Profile.UserName,
			"ok":       err == nil,
		}
		if err != nil {
			failed++
			entry["error"] = multiProfileErrorPayload(err)
		} else {
			succeeded++
			if payload := multiProfileResultPayload(result); payload != nil {
				entry["result"] = payload
			}
			if result.Response != nil {
				if endpoint, ok := result.Response["endpoint"]; ok {
					entry["endpoint"] = endpoint
				}
			}
		}
		entries = append(entries, entry)
	}

	invocation.Implemented = true
	return executor.Result{
		Invocation: invocation,
		Response: map[string]any{
			"content": map[string]any{
				"success":      failed == 0,
				"multiProfile": true,
				"summary": map[string]any{
					"total":     len(selections),
					"succeeded": succeeded,
					"failed":    failed,
				},
				"profiles": entries,
			},
		},
	}, nil
}

func cloneInvocation(invocation executor.Invocation) executor.Invocation {
	cloned := invocation
	if invocation.Params != nil {
		cloned.Params = make(map[string]any, len(invocation.Params))
		for key, value := range invocation.Params {
			cloned.Params[key] = value
		}
	}
	return cloned
}

func multiProfileResultPayload(result executor.Result) any {
	if result.Response == nil {
		return nil
	}
	if content, ok := result.Response["content"]; ok {
		return content
	}
	return result.Response
}

func multiProfileErrorPayload(err error) map[string]any {
	payload := map[string]any{
		"message": err.Error(),
	}
	var typed *apperrors.Error
	if errors.As(err, &typed) {
		payload["category"] = string(typed.Category)
		if typed.Reason != "" {
			payload["reason"] = typed.Reason
		}
		if typed.Operation != "" {
			payload["operation"] = typed.Operation
		}
		if typed.Origin != "" {
			payload["origin"] = typed.Origin
		}
		if typed.FailureStage != "" {
			payload["stage"] = typed.FailureStage
		}
		if typed.ExecutionStarted != nil {
			payload["execution_started"] = *typed.ExecutionStarted
		}
		if typed.RetryableSet {
			payload["retryable"] = typed.Retryable
		}
		if typed.Hint != "" {
			payload["hint"] = typed.Hint
		}
		if len(typed.Actions) > 0 {
			payload["actions"] = append([]string(nil), typed.Actions...)
		}
		if len(typed.Details) > 0 {
			payload["details"] = typed.Details
		}
		if typed.ServerDiag.TraceID != "" {
			payload["trace_id"] = typed.ServerDiag.TraceID
		}
		if typed.ServerDiag.ServerErrorCode != "" {
			payload["server_error_code"] = typed.ServerDiag.ServerErrorCode
		}
		if code := typed.ExitCode(); code != 0 {
			payload["exitCode"] = code
		}
	}
	return payload
}

// handleCatalogMiss decides what to do when the dynamic server registry has
// no endpoint for the requested product / tool and no `directRuntimeEndpoint`
// match fired earlier. The discovery catalog is retired; endpoint resolution
// is the dynamic server registry only, so a registry miss here is terminal.
//
// Previously every miss silently fell through to EchoRunner, which
// returns an empty `executor.Result{Response: nil}`. The helper-invocation
// adapter then converted that into `&edition.ToolResult{}`, whose `Content`
// marshals to `null`, surfacing as `{"Content": null}` at the CLI. Users had no
// signal that endpoint resolution failed — see the fix-wukong-discovery-missing-servers plan (Phase 3) for the full trace.
//
// Contract: return an explicit apperrors.NewAPI("endpoint_not_resolved")
// with the offending product/tool attached. This fails fast to stderr and
// makes missing envelopes / supplement gaps immediately visible. Dry-run
// invocations never reach this path in production: Run enforces the dry-run
// barrier before endpoint resolution, and runSingle is only re-entered via
// Run (multi-profile and PAT retry both route back through it).
func (r *runtimeRunner) handleCatalogMiss(_ context.Context, invocation executor.Invocation, detail string) (executor.Result, error) {
	return executor.Result{}, endpointNotResolvedError(invocation.CanonicalProduct, invocation.Tool, detail)
}

// endpointNotResolvedError builds the shared terminal error for a dynamic
// server registry miss. Both the runtime runner (handleCatalogMiss) and the
// recovery runtime (resolveEndpoint) use it so endpoint misses classify
// identically: CategoryAPI, operation "discovery.resolve", reason
// "endpoint_not_resolved", with the product ID as the server key.
func endpointNotResolvedError(productID, toolName, detail string) error {
	hint := "当前命令已注册，但静态端点目录中缺少对应 product/server endpoint。这通常是服务发现下线后的同步产物缺口，不是参数错误；请不要通过反复调整 flag 重试。"
	actions := []string{
		"确认 internal/syncdata.StaticServers() 是否包含该 product/server",
		"运行 sync-oss 重新生成静态端点与路由",
		"若该能力已下线，请在 skill 与 --help 中标记 unavailable 并提供替代命令",
	}
	if strings.TrimSpace(productID) == devappProductID {
		hint = "dev app（product id: devapp）是 helper-only 产品，命令树不依赖服务发现；真实调用需要通过 StaticServers/SupplementServers 注入 MCP endpoint，或本地调试临时设置 DINGTALK_DEVAPP_MCP_URL。"
		actions = []string{
			"检查 StaticServers/SupplementServers 是否包含 devapp endpoint",
			"本地调试可临时设置 DINGTALK_DEVAPP_MCP_URL 后重试",
		}
	}
	return apperrors.NewAPI(
		fmt.Sprintf("endpoint not resolved for product %q (tool %q): %s", productID, toolName, detail),
		apperrors.WithOperation("discovery.resolve"),
		apperrors.WithReason("endpoint_not_resolved"),
		apperrors.WithServerKey(productID),
		apperrors.WithHint(hint),
		apperrors.WithActions(actions...),
	)
}

func (r *runtimeRunner) executeInvocation(ctx context.Context, endpoint string, invocation executor.Invocation) (result executor.Result, retErr error) {
	// Route stdio:// endpoints to the local StdioClient — no HTTP, no auth.
	if IsStdioEndpoint(endpoint) {
		return r.executeStdioInvocationAtEndpoint(ctx, endpoint, invocation)
	}

	// Constructing the Cobra tree is also used for help, schema, and command
	// discovery. Open the process-wide audit writer only when a real invocation
	// reaches the execution boundary so read-only command inspection does not
	// leave an audit lock handle behind (which prevents TempDir cleanup on
	// Windows). Keep an injected sink when tests or editions provide one.
	auditSink := r.auditSink
	if auditSink == nil {
		auditSink = setupAuditSink()
	}

	invokeStart := time.Now()
	execID := generateExecutionID()
	r.transport.ExecutionId = execID

	// Lazy bind FileLogger: it may be nil at construction time because
	// configureLogLevel runs later in PersistentPreRunE.
	if r.transport.FileLogger == nil {
		r.transport.FileLogger = FileLoggerInstance()
	}

	fl := r.transport.FileLogger

	defer func() {
		var errCat, errReason string
		if retErr != nil {
			var typed *apperrors.Error
			if errors.As(retErr, &typed) {
				errCat = string(typed.Category)
				errReason = typed.Reason
			} else {
				errCat = "unknown"
				errReason = retErr.Error()
			}
		}
		logging.LogCommandEnd(fl, execID,
			invocation.CanonicalProduct, invocation.Tool,
			retErr == nil, time.Since(invokeStart), errCat, errReason)
		emitAudit(auditSink, execID, invokeStart, invocation, endpoint, retErr, version)
	}()

	// Check whether this product belongs to an HTTP plugin. Every accepted
	// plugin has an ownership record; credentials within that record are
	// optional. Plugin requests never fall back to the default DingTalk OAuth.
	pluginAuth, hasPluginAuth := LookupPluginAuth(invocation.CanonicalProduct)

	authToken := ""
	if hasPluginAuth {
		authToken = pluginAuth.Token
	} else if !invocation.DryRun && (r.globalFlags == nil || !r.globalFlags.Mock) {
		snapshot, tokenErr := runnerResolveAuthSnapshot(r, ctx)
		if tokenErr != nil {
			return executor.Result{}, tokenResolutionError(tokenErr)
		}
		authToken = snapshot.AccessToken
		if !hasDirectRuntimeEndpointOverride(invocation.CanonicalProduct) &&
			isDingTalkMCPGatewayEndpoint(endpoint) &&
			(snapshot.LoginRegionKnown || authpkg.MCPBaseURLOverride() != "") {
			endpoint = activeDingTalkGatewayEndpointForLoginRegion(endpoint, snapshot.LoginRegion)
		}
	}

	var timeoutSec int
	if r.globalFlags != nil {
		timeoutSec = r.globalFlags.Timeout
	}
	logging.LogCommandStart(fl, execID,
		invocation.CanonicalProduct, invocation.Tool, endpoint, version, authToken != "", timeoutSec)

	if invocation.DryRun {
		// Emit a wukong-aligned human-readable preview on stderr so the dry-run
		// surface advertises the resolved MCP arguments without polluting the
		// stdout payload (which stays valid JSON in --format json mode). Mirrors
		// wukong's "Arguments: {...}" dry-run line; stderr keeps it out of the
		// machine-readable channel.
		if argsJSON, err := json.Marshal(invocation.Params); err == nil {
			fmt.Fprintf(os.Stderr, "DRY-RUN Arguments: %s\n", argsJSON)
		}
		return executor.Result{
			Invocation: invocation,
			Response: map[string]any{
				"dry_run":  true,
				"endpoint": transport.RedactURL(endpoint),
				"request":  executor.ToolCallRequest(invocation.Tool, invocation.Params),
				"note":     "execution skipped by --dry-run",
			},
		}, nil
	}

	// Mock mode: return predefined mock response without network call.
	if r.globalFlags != nil && r.globalFlags.Mock {
		invocation.Implemented = true
		return executor.Result{
			Invocation: invocation,
			Response: map[string]any{
				"endpoint": transport.RedactURL(endpoint),
				"content": map[string]any{
					"success": true,
					"result":  []any{},
					"_mock":   true,
					"_tool":   invocation.Tool,
				},
			},
		}, nil
	}

	// Preserve a final execution-boundary guard even though the built-in token
	// resolver normally returns either a non-empty token or an error. HTTP
	// plugins are ownership-scoped separately and may intentionally be anonymous.
	if !hasPluginAuth && strings.TrimSpace(authToken) == "" {
		return executor.Result{}, apperrors.NewAuth(
			"未登录，请先执行 dws auth login",
			apperrors.WithReason("not_authenticated"),
			apperrors.WithHint("运行 'dws auth login' 完成登录后重试"),
			apperrors.WithActions("dws auth login"),
		)
	}

	var tc *transport.Client
	if hasPluginAuth {
		// Plugin ownership is authoritative even when the plugin is anonymous.
		// Copy and sanitize manifest headers so plugins cannot opt themselves into
		// DWS-owned Agent metadata by declaring the reserved names directly.
		tc = r.transport.WithAuth(authToken, pluginRequestHeaders(pluginAuth))
		tc.TrustedDomains = pluginAuth.TrustedDomains
	} else {
		// Default path: use DingTalk OAuth token with identity headers. Agent
		// metadata is resolved exactly once per invocation and is excluded from
		// helper-only service-discovery requests.
		if r.agentMetadata != nil {
			tc = r.transport.WithAuth(authToken, resolveMCPRequestHeadersForInvocation(invocation, *r.agentMetadata))
		} else {
			tc = r.transport.WithAuth(authToken, resolveMCPRequestHeadersForInvocation(invocation))
		}
	}

	callCtx := ctx
	if r.globalFlags != nil && r.globalFlags.Timeout > 0 {
		var cancel context.CancelFunc
		callCtx, cancel = context.WithTimeout(ctx, time.Duration(r.globalFlags.Timeout)*time.Second)
		defer cancel()
	}

	if err := runnerPreflightDocDownload(r, callCtx, tc, endpoint, invocation); err != nil {
		if patCheck := apperrors.AsPatAuthCheckError(err); patCheck != nil {
			if IsPatRetrying(ctx) {
				return executor.Result{}, patCheck
			}
			return runnerHandlePatAuthCheck(ctx, r, invocation, patCheck, defaultConfigDir(), os.Stderr)
		}
		if result, retryErr, handled := r.retryAuthRefreshRequired(ctx, endpoint, invocation, authToken, err, hasPluginAuth); handled {
			if retryErr != nil {
				runnerCaptureRuntimeFailure(invocation, err, retryErr)
			}
			return result, retryErr
		}
		runnerCaptureRuntimeFailure(invocation, err, err)
		return executor.Result{}, err
	}

	callStart := time.Now()
	callResult, err := runnerCallTool(tc, callCtx, endpoint, invocation.Tool, invocation.Params)
	RecordTiming(ctx, "mcp_call", time.Since(callStart))
	if err != nil {
		if isRefreshableTransportAuthError(err) {
			if fn := edition.Get().OnAuthError; fn != nil {
				if overrideErr := fn(defaultConfigDir(), err); overrideErr != nil {
					if result, retryErr, handled := r.retryAuthRefreshRequired(ctx, endpoint, invocation, authToken, overrideErr, hasPluginAuth); handled {
						if retryErr != nil {
							runnerCaptureRuntimeFailure(invocation, err, retryErr)
						}
						return result, retryErr
					}
					runnerCaptureRuntimeFailure(invocation, err, overrideErr)
					return executor.Result{}, overrideErr
				}
			}
		}
		// PAT scope error: offer human-readable output and retry after authorization
		if isPatScopeError(err) {
			scopeErr := extractPatScopeError(err)
			runnerCaptureRuntimeFailure(invocation, err, err)
			return runnerRetryWithPatAuthRetry(ctx, r, invocation, scopeErr, defaultConfigDir(), os.Stderr)
		}
		runnerCaptureRuntimeFailure(invocation, err, err)
		return executor.Result{}, err
	}

	// ---- Edition hook gets first dibs (preserves overlay PATError passthrough) ----
	if fn := edition.Get().ClassifyToolResult; fn != nil {
		if editionErr := fn(callResult.Content); editionErr != nil {
			if patCheck := apperrors.AsPatAuthCheckError(editionErr); patCheck != nil {
				if IsPatRetrying(ctx) {
					return executor.Result{}, patCheck // already retried once, don't loop
				}
				return runnerHandlePatAuthCheck(ctx, r, invocation, patCheck, defaultConfigDir(), os.Stderr)
			}
			if result, retryErr, handled := r.retryAuthRefreshRequired(ctx, endpoint, invocation, authToken, editionErr, hasPluginAuth); handled {
				if retryErr != nil {
					runnerCaptureRuntimeFailure(invocation, editionErr, retryErr)
				}
				return result, retryErr
			}
			return executor.Result{}, editionErr
		}
	}

	// ---- Structured PAT auth check (open-source fallback) ----
	if patCheck := apperrors.ClassifyPatAuthCheck(callResult.Content); patCheck != nil {
		if IsPatRetrying(ctx) {
			return executor.Result{}, patCheck // already retried once, don't loop
		}
		return runnerHandlePatAuthCheck(ctx, r, invocation, patCheck, defaultConfigDir(), os.Stderr)
	}

	if callResult.IsError {
		diag := transport.ExtractServerDiagnosticsFromMap(callResult.Content)

		// ClassifyToolResult hook: let the overlay intercept known error
		// patterns (PAT permission, gateway-auth) before generic handling.
		if classify := edition.Get().ClassifyToolResult; classify != nil {
			if hookErr := classify(callResult.Content); hookErr != nil {
				if result, retryErr, handled := r.retryAuthRefreshRequired(ctx, endpoint, invocation, authToken, hookErr, hasPluginAuth); handled {
					if retryErr != nil {
						runnerCaptureRuntimeFailure(invocation, hookErr, retryErr)
					}
					return result, retryErr
				}
				runnerCaptureRuntimeFailure(invocation, hookErr, hookErr)
				return executor.Result{}, hookErr
			}
		}

		mcpErr := newServerFailureAPIError(
			extractMCPErrorMessage(callResult),
			"mcp_tool_error",
			"MCP tool returned a business error; check tool parameters and refer to skill documentation.",
			invocation.CanonicalProduct,
			diag,
		)
		logBusinessError(r.transport.FileLogger, serverFailureReason(mcpErr, "mcp_tool_error"), invocation, callResult.Content, diag)
		// PAT scope error in business response: offer human-readable output and retry
		if isPatScopeError(mcpErr) {
			scopeErr := extractPatScopeError(mcpErr)
			runnerCaptureRuntimeFailure(invocation, mcpErr, mcpErr)
			return runnerRetryWithPatAuthRetry(ctx, r, invocation, scopeErr, defaultConfigDir(), os.Stderr)
		}
		runnerCaptureRuntimeFailure(invocation, mcpErr, mcpErr)
		return executor.Result{}, mcpErr
	}

	scanReport, err := r.scanContent(callResult.Content)
	if err != nil {
		return executor.Result{}, err
	}

	if bizErr := detectBusinessError(callResult.Content); bizErr != "" {
		diag := transport.ExtractServerDiagnosticsFromMap(callResult.Content)
		classifiedErr := newServerFailureAPIError(
			bizErr,
			"business_error",
			"The API returned a business-level error. Check required parameters and values.",
			invocation.CanonicalProduct,
			diag,
		)
		logBusinessError(r.transport.FileLogger, serverFailureReason(classifiedErr, "business_error"), invocation, callResult.Content, diag)
		return executor.Result{}, classifiedErr
	}

	invocation.Implemented = true
	// Align with wukong's response envelope: stamp a top-level success=true on
	// map payloads that don't already carry a success flag. Business errors
	// (success=false) are intercepted above, so reaching here means the call
	// succeeded. Additive only — existing keys are never overwritten.
	if callResult.Content != nil {
		if _, has := callResult.Content["success"]; !has {
			callResult.Content["success"] = true
		}
	}
	response := map[string]any{
		"endpoint": transport.RedactURL(endpoint),
		"content":  callResult.Content,
	}
	if r.includeScanReport && scanReport.Scanned {
		response["safety"] = scanReport
	}
	return executor.Result{Invocation: invocation, Response: response}, nil
}

func (r *runtimeRunner) executeStdioInvocationAtEndpoint(
	ctx context.Context,
	endpoint string,
	invocation executor.Invocation,
) (executor.Result, error) {
	if invocation.DryRun {
		return executor.Result{
			Invocation: invocation,
			Response: map[string]any{
				"dry_run":   true,
				"transport": "stdio",
				"request":   executor.ToolCallRequest(invocation.Tool, invocation.Params),
				"note":      "execution skipped by --dry-run",
			},
		}, nil
	}

	lookupKey := strings.Trim(strings.TrimPrefix(strings.TrimSpace(endpoint), stdioEndpointScheme), "/")
	if lookupKey == "" {
		lookupKey = invocation.CanonicalProduct
	}
	client, ok := LookupStdioClient(lookupKey)
	if !ok {
		return executor.Result{}, apperrors.NewInternal(
			fmt.Sprintf("stdio client not found for %q", lookupKey))
	}

	callCtx := ctx
	if r.globalFlags != nil && r.globalFlags.Timeout > 0 {
		var cancel context.CancelFunc
		callCtx, cancel = context.WithTimeout(ctx, time.Duration(r.globalFlags.Timeout)*time.Second)
		defer cancel()
	}
	if err := runnerStdioEnsureInitialized(client, callCtx); err != nil {
		return executor.Result{}, apperrors.NewAPI(
			fmt.Sprintf("stdio initialize failed: %v", err),
			apperrors.WithOperation("initialize"),
			apperrors.WithReason("stdio_initialize_error"),
		)
	}

	tools, err := runnerStdioListTools(client, callCtx)
	if err != nil {
		return executor.Result{}, apperrors.NewAPI(
			fmt.Sprintf("stdio tools/list failed: %v", err),
			apperrors.WithOperation("tools/list"),
			apperrors.WithReason("stdio_tools_list_error"),
		)
	}
	schema, ok := pluginToolInputSchema(tools, invocation.Tool)
	if !ok {
		return executor.Result{}, apperrors.NewValidation(
			fmt.Sprintf("plugin tool %q is not declared by tools/list", invocation.Tool),
			apperrors.WithReason("plugin_tool_not_found"),
		)
	}
	normalizedParams, err := normalizePluginInputParams(invocation.Params, schema)
	if err != nil {
		return executor.Result{}, err
	}
	invocation.Params = normalizedParams

	callResult, err := runnerStdioCallTool(client, callCtx, invocation.Tool, invocation.Params)
	if err != nil {
		return executor.Result{}, apperrors.NewAPI(
			fmt.Sprintf("stdio call failed: %v", err),
			apperrors.WithOperation("tools/call"),
			apperrors.WithReason("stdio_error"),
		)
	}

	if callResult.IsError {
		return executor.Result{}, apperrors.NewAPI(
			extractMCPErrorMessage(callResult),
			apperrors.WithOperation("tools/call"),
			apperrors.WithReason("mcp_tool_error"),
			apperrors.WithServerKey(invocation.CanonicalProduct),
		)
	}

	invocation.Implemented = true
	return executor.Result{
		Invocation: invocation,
		Response: map[string]any{
			"transport": "stdio",
			"content":   callResult.Content,
		},
	}, nil
}

func (r *runtimeRunner) resolveAuthToken(ctx context.Context) (string, error) {
	snapshot, err := r.resolveAuthSnapshot(ctx)
	if err != nil {
		return "", err
	}
	return snapshot.AccessToken, nil
}

func (r *runtimeRunner) resolveAuthSnapshot(ctx context.Context) (AccessTokenSnapshot, error) {
	explicitToken := ""
	if r != nil && r.globalFlags != nil {
		explicitToken = r.globalFlags.Token
	}
	return resolveRuntimeAuthSnapshot(ctx, explicitToken)
}

func resolveRuntimeAuthToken(ctx context.Context, explicitToken string) (string, error) {
	snapshot, err := resolveRuntimeAuthSnapshot(ctx, explicitToken)
	if err != nil {
		return "", err
	}
	return snapshot.AccessToken, nil
}

func resolveRuntimeAuthSnapshot(ctx context.Context, explicitToken string) (AccessTokenSnapshot, error) {
	return runtimeTokenManager.Get(ctx, defaultConfigDir(), explicitToken)
}

// getCachedRuntimeToken is kept as the prefetch seam used by runner tests. The
// cache itself lives exclusively in TokenManager.
func getCachedRuntimeToken(ctx context.Context) (string, error) {
	loadStart := time.Now()
	defer func() { RecordTiming(ctx, "auth_keychain", time.Since(loadStart)) }()
	return resolveRuntimeAuthToken(ctx, "")
}

func tokenResolutionError(err error) error {
	if err == nil {
		return nil
	}
	if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) {
		return err
	}
	if errors.Is(err, authpkg.ErrTokenDataNotFound) {
		return apperrors.NewAuth(
			"未登录，请先执行 dws auth login",
			apperrors.WithReason("not_authenticated"),
			apperrors.WithHint("运行 'dws auth login' 完成登录后重试"),
			apperrors.WithActions("dws auth login"),
			apperrors.WithCause(err),
		)
	}
	// Keychain, parse, permission, lock, and refresh failures are real local or
	// network errors. Preserve their cause instead of disguising them as logout.
	return fmt.Errorf("resolve access token: %w", err)
}

// generateExecutionID returns a random 16-char hex string used to correlate
// all log entries (command_start, jsonrpc_request, command_end, etc.) belonging
// to a single command invocation.
func generateExecutionID() string {
	b := make([]byte, 8)
	_, _ = rand.Read(b)
	return hex.EncodeToString(b)
}

// ResetRuntimeTokenCache clears the cached token, forcing a reload on next access.
// This should be called after login/logout operations.
func ResetRuntimeTokenCache() {
	runtimeTokenManager.Invalidate()
}

func newRuntimeContentScanner() safety.Scanner {
	if !runtimeFlagEnabled(os.Getenv(runtimeContentScanEnv), true) {
		return nil
	}
	return safety.NewContentScanner()
}

func (r *runtimeRunner) scanContent(content map[string]any) (safety.Report, error) {
	if r == nil || r.scanner == nil {
		return safety.Report{Scanned: false}, nil
	}
	report := r.scanner.ScanPayload(content)
	if r.enforceContentScan && len(report.Findings) > 0 {
		return report, apperrors.NewValidation("runtime response blocked by content safety scan")
	}
	return report, nil
}

func runtimeFlagEnabled(raw string, defaultValue bool) bool {
	trimmed := strings.ToLower(strings.TrimSpace(raw))
	if trimmed == "" {
		return defaultValue
	}
	switch trimmed {
	case "0", "false", "no", "n", "off":
		return false
	default:
		return true
	}
}

func isAuthError(err error) bool {
	var appErr *apperrors.Error
	if errors.As(err, &appErr) {
		return appErr.Category == apperrors.CategoryAuth
	}
	return false
}

func productEndpointOverride(productID string) (string, bool) {
	key := "DINGTALK_" + strings.ToUpper(strings.ReplaceAll(strings.TrimSpace(productID), "-", "_")) + "_MCP_URL"
	value := strings.TrimSpace(os.Getenv(key))
	if value == "" {
		return "", false
	}
	return value, true
}

// resolveIdentityHeaders loads or creates agent identity and returns HTTP
// headers to inject into MCP requests. Best-effort: returns nil on failure.
func resolveIdentityHeaders() map[string]string {
	id := authpkg.EnsureExists(defaultConfigDir())
	headers := id.Headers()

	// Inject environment variable based headers for MCP gateway tracking.
	// DINGTALK_AGENT, if set by the caller, is forwarded verbatim as the
	// x-dingtalk-agent header. It does NOT influence the edition-fixed
	// claw-type or the host-owned PAT decision (driven solely by
	// DINGTALK_DWS_AGENTCODE).
	sessionID := os.Getenv(envDingtalkSessionID)
	if sessionID == "" {
		sessionID = os.Getenv(envDWSSessionID)
	}
	if sessionID == "" {
		sessionID = os.Getenv(envRewindSessionID)
	}
	// Resolve the agent_code (accuracy-first; unknown hosts stay empty) and the
	// per-(machine × agent_code) instance id when a code is known. Synthetic
	// fallbacks must not be sent because PAT authorization checks use the same
	// header as their grant key.
	//
	// Backward-compat by design (additive, not breaking):
	//   - x-dws-agent-id keeps its v1 meaning = machine-level install UUID
	//     (set by id.Headers() above), so old/new clients stay comparable.
	//   - x-dws-agent-instance-id is NEW: the per-(machine × agent_code) id,
	//     sent only when x-dingtalk-dws-agent-code is non-empty.
	// Note: x-dws-channel (DWS_CHANNEL) is a separate axis, untouched.
	agentCode, agentCodeSig := authpkg.DetectAgentCode()
	if agentInstanceID := id.ResolveAgentID(defaultConfigDir(), agentCode, agentCodeSig); agentInstanceID != "" {
		headers["x-dws-agent-instance-id"] = agentInstanceID
	}

	// Emit the CLI version on the wire so the gateway can segment old vs new
	// clients (and scope agent_code coverage / adoption). The header constant
	// existed but was never set; wire it here.
	if version != "" {
		headers[transport.HeaderVersion] = version
	}
	envHeaders := map[string]string{
		"x-dingtalk-agent":          os.Getenv(envDingtalkAgent),
		"x-dingtalk-dws-agent-code": agentCode,
		"x-dingtalk-trace-id":       os.Getenv(envDingtalkTraceID),
		"x-dingtalk-session-id":     sessionID,
		"x-dingtalk-message-id":     os.Getenv(envDingtalkMessageID),
	}
	for k, v := range envHeaders {
		if v != "" {
			headers[k] = v
		}
	}

	// Inject third-party channel headers. DWS_CHANNEL is forwarded as the
	// upstream channelCode.
	if v := os.Getenv(envDWSChannel); v != "" {
		headers["x-dws-channel"] = v
	}

	// DWS_AGENT_HOST is a caller-declared runtime-form signal. Root command
	// execution validates it strictly in PersistentPreRunE. Library callers
	// that bypass the root command keep this best-effort API contract: invalid
	// values are omitted rather than changing the public function signature.
	if agentHost, err := parseAgentHost(os.Getenv(envDWSAgentHost)); err == nil && agentHost != "" {
		headers[headerDWSAgentHost] = agentHost
	}

	if fn := edition.Get().MergeHeaders; fn != nil {
		headers = fn(headers)
	}
	if headers == nil {
		headers = make(map[string]string)
	}

	// claw-type is the edition-fixed routing/PAT identity. Agent Product is a
	// separate caller-declared observability and IM-display dimension.
	clawType := resolveEditionClawType(headers)
	headers["claw-type"] = clawType
	headers = applyAgentProductHeader(headers)
	agentProduct, hasAgentProduct := headers[agentproduct.HeaderName]
	if fn := edition.Get().EnterpriseCredentialHeaders; fn != nil {
		headers = fn(headers)
	}
	if headers == nil {
		headers = make(map[string]string)
	}
	// Credential hooks cannot alter either identity dimension. Restore the
	// fixed claw-type and the validated Product Header (or its absence).
	headers["claw-type"] = clawType
	if hasAgentProduct {
		headers[agentproduct.HeaderName] = agentProduct
	} else {
		delete(headers, agentproduct.HeaderName)
	}
	// Agent version and extension are intentionally MCP-request-only. Remove
	// every case variant potentially supplied by an edition or credential hook
	// so shared consumers such as A2A cannot inherit them.
	removeAgentMetadataHeaders(headers)
	return headers
}

// detectBusinessError checks the MCP response content for DingTalk business
// errors (success=false + errorCode/errorMsg) that are not flagged at the MCP
// protocol level. Returns the error message, or "" if the response is OK.
func detectBusinessError(content map[string]any) string {
	return detectBusinessErrorAtDepth(content, 0)
}

func detectBusinessErrorAtDepth(content map[string]any, depth int) string {
	if content == nil || depth > 8 {
		return ""
	}
	success, ok := content["success"]
	if !ok {
		return detectNestedBusinessError(content, depth)
	}
	b, ok := success.(bool)
	if !ok || b {
		return detectNestedBusinessError(content, depth)
	}
	if nested := detectNestedBusinessError(content, depth); nested != "" {
		return nested
	}
	if msg, ok := content["errorMsg"].(string); ok && strings.TrimSpace(msg) != "" {
		return strings.TrimSpace(msg)
	}
	if code, ok := content["errorCode"].(string); ok && strings.TrimSpace(code) != "" {
		return "business error: code " + strings.TrimSpace(code)
	}
	return "business error: success=false"
}

func detectNestedBusinessError(content map[string]any, depth int) string {
	for _, key := range []string{"content", "result", "data"} {
		switch child := content[key].(type) {
		case map[string]any:
			if msg := detectBusinessErrorAtDepth(child, depth+1); msg != "" {
				return msg
			}
		case []any:
			for _, item := range child {
				childMap, ok := item.(map[string]any)
				if !ok {
					continue
				}
				if msg := detectBusinessErrorAtDepth(childMap, depth+1); msg != "" {
					return msg
				}
			}
		}
	}
	return ""
}

// extractMCPErrorMessage builds an error message from a ToolCallResult with
// isError=true. It extracts text from content blocks when available.
func extractMCPErrorMessage(result transport.ToolCallResult) string {
	// Try text from content blocks first.
	for _, block := range result.Blocks {
		text := strings.TrimSpace(block.Text)
		if text != "" {
			return text
		}
	}
	// Try stringified content map.
	if msg, ok := result.Content["message"].(string); ok && strings.TrimSpace(msg) != "" {
		return strings.TrimSpace(msg)
	}
	if msg, ok := result.Content["error"].(string); ok && strings.TrimSpace(msg) != "" {
		return strings.TrimSpace(msg)
	}
	return "MCP tool returned an error response"
}

// logBusinessError logs MCP tool errors and business errors to the file logger
// so they can be diagnosed offline. These errors arrive as HTTP 200 responses
// and would otherwise not be captured by transport-level logging.
func logBusinessError(logger *slog.Logger, reason string, inv executor.Invocation, content map[string]any, diag apperrors.ServerDiagnostics) {
	if logger == nil {
		return
	}
	attrs := []any{
		"product", inv.CanonicalProduct,
		"tool", inv.Tool,
		"reason", reason,
	}
	if diag.TraceID != "" {
		attrs = append(attrs, "trace_id", diag.TraceID)
	}
	if diag.ServerErrorCode != "" {
		attrs = append(attrs, "server_error_code", diag.ServerErrorCode)
	}
	if diag.TechnicalDetail != "" {
		attrs = append(attrs, "technical_detail", diag.TechnicalDetail)
	}
	if msg, ok := content["error"].(string); ok {
		attrs = append(attrs, "error", msg)
	}
	if msg, ok := content["errorMsg"].(string); ok {
		attrs = append(attrs, "errorMsg", msg)
	}
	if msg, ok := content["message"].(string); ok {
		attrs = append(attrs, "message", msg)
	}
	logger.Warn("business_error", attrs...)
}