package intent

// V2ShadowReport V1/V2 影子比对结果（只观测，默认不影响路由）
type V2ShadowReport struct {
	Enabled          bool       `json:"enabled"`
	V1Intent         IntentType `json:"v1_intent"`
	V2LegacyIntent   IntentType `json:"v2_legacy_intent"`
	V2ActionKey      string     `json:"v2_action_key,omitempty"`
	V2Goal           GoalType   `json:"v2_goal,omitempty"`
	V2Risk           RiskLevel  `json:"v2_risk,omitempty"`
	Mismatch         bool       `json:"mismatch"`
	DecisionEligible bool       `json:"decision_eligible"`
	WouldUseV2Route  bool       `json:"would_use_v2_route,omitempty"`
	DecisionTier     string     `json:"decision_tier,omitempty"`
	ConflictKinds    []string   `json:"conflict_kinds,omitempty"`
}

// BuildV2ShadowReport 构建 V1/V2 影子比对（intent_v2_shadow 开启时调用）
func BuildV2ShadowReport(res *IntentRecognitionResult, flags FeatureFlags) *V2ShadowReport {
	if res == nil || res.TopIntent == nil || res.IntentFrameV2 == nil {
		return nil
	}
	if !flags.IntentV2Shadow && !flags.IntentV2Decision {
		return nil
	}

	v1 := res.TopIntent.Intent
	v2 := res.IntentFrameV2.LegacyIntent
	if v2 == "" {
		v2 = LegacyIntentFromFrame(res.IntentFrameV2)
	}

	spec, _ := DefaultRegistry().Get(res.IntentFrameV2.ActionKey)
	risk := RiskLow
	if spec != nil {
		risk = spec.Risk
	}

	tier := flags.V2DecisionTier
	if flags.IntentV2Decision && tier == V2TierNone {
		tier = V2TierQuery
	}
	eligible := flags.IntentV2Decision && tierAllowsRisk(tier, risk)

	report := &V2ShadowReport{
		Enabled:          flags.IntentV2Shadow || flags.IntentV2Decision,
		V1Intent:         v1,
		V2LegacyIntent:   v2,
		V2ActionKey:      res.IntentFrameV2.ActionKey,
		V2Goal:           res.IntentFrameV2.Goal,
		V2Risk:           risk,
		Mismatch:         v1 != v2,
		DecisionEligible: eligible,
		WouldUseV2Route:  eligible && !res.RequiresClarifying,
		DecisionTier:     string(tier),
	}
	if res.RankedFrames != nil {
		for _, c := range res.RankedFrames.Conflicts {
			report.ConflictKinds = append(report.ConflictKinds, c.Kind)
		}
	}
	return report
}

// ApplyV2ShadowObservability 填充影子观测字段（不改变 TopIntent）
func ApplyV2ShadowObservability(res *IntentRecognitionResult) {
	if res == nil {
		return
	}
	flags := CurrentFeatureFlags()
	if !flags.IntentV2Shadow && !flags.IntentV2Decision {
		return
	}
	res.V2Shadow = BuildV2ShadowReport(res, flags)
}