package intent

import (
	"fmt"
	"sync"
)

// RiskLevel 动作风险等级
type RiskLevel string

const (
	RiskLow    RiskLevel = "low"
	RiskMedium RiskLevel = "medium"
	RiskHigh   RiskLevel = "high"
)

// ActionAlias 自然语言别名
type ActionAlias struct {
	Phrase string   `json:"phrase"`
	Acts   []DialogueAct `json:"acts,omitempty"`
}

// SlotSpec 槽位规格
type SlotSpec struct {
	Key      string `json:"key"`
	Required bool   `json:"required"`
	Label    string `json:"label,omitempty"`
}

// ActionSpec 可识别、可授权、可执行的动作单一事实源
type ActionSpec struct {
	Key             string        `json:"key"`
	Domain          string        `json:"domain"`
	Object          string        `json:"object"`
	Goal            GoalType      `json:"goal"`
	Risk            RiskLevel     `json:"risk"`

	Aliases         []ActionAlias `json:"aliases,omitempty"`
	DialogueActs    []DialogueAct `json:"dialogue_acts,omitempty"`

	RequiredSlots   []SlotSpec    `json:"required_slots,omitempty"`
	OptionalSlots   []SlotSpec    `json:"optional_slots,omitempty"`

	CapabilityKey   string        `json:"capability_key,omitempty"`
	AllowedStates   []string      `json:"allowed_states,omitempty"`
	RequiresConfirm bool          `json:"requires_confirm,omitempty"`
	IdempotencyMode string        `json:"idempotency_mode,omitempty"`

	LegacyIntent    IntentType    `json:"legacy_intent"`
}

// ActionRegistry 动作注册表
type ActionRegistry struct {
	mu      sync.RWMutex
	byKey   map[string]*ActionSpec
	byLegacy map[IntentType]*ActionSpec
}

var defaultRegistry *ActionRegistry

func init() {
	defaultRegistry = NewActionRegistry()
	registerBuiltinActions(defaultRegistry)
}

// DefaultRegistry 返回全局内置注册表
func DefaultRegistry() *ActionRegistry {
	return defaultRegistry
}

// NewActionRegistry 创建空注册表
func NewActionRegistry() *ActionRegistry {
	return &ActionRegistry{
		byKey:    make(map[string]*ActionSpec),
		byLegacy: make(map[IntentType]*ActionSpec),
	}
}

// Register 注册动作规格
func (r *ActionRegistry) Register(spec ActionSpec) error {
	r.mu.Lock()
	defer r.mu.Unlock()
	if spec.Key == "" {
		return fmt.Errorf("action spec key is required")
	}
	if spec.LegacyIntent == "" {
		return fmt.Errorf("action spec %s: legacy_intent is required", spec.Key)
	}
	if existing, ok := r.byKey[spec.Key]; ok && existing.LegacyIntent != spec.LegacyIntent {
		return fmt.Errorf("duplicate action key %s", spec.Key)
	}
	cp := spec
	r.byKey[spec.Key] = &cp
	r.byLegacy[spec.LegacyIntent] = &cp
	return nil
}

// Get 按 action_key 查找
func (r *ActionRegistry) Get(key string) (*ActionSpec, bool) {
	r.mu.RLock()
	defer r.mu.RUnlock()
	spec, ok := r.byKey[key]
	return spec, ok
}

// GetByLegacyIntent 按旧 IntentType 查找
func (r *ActionRegistry) GetByLegacyIntent(t IntentType) (*ActionSpec, bool) {
	r.mu.RLock()
	defer r.mu.RUnlock()
	spec, ok := r.byLegacy[t]
	return spec, ok
}

// All 返回全部已注册动作
func (r *ActionRegistry) All() []*ActionSpec {
	r.mu.RLock()
	defer r.mu.RUnlock()
	out := make([]*ActionSpec, 0, len(r.byKey))
	for _, s := range r.byKey {
		out = append(out, s)
	}
	return out
}

// CapabilityKeys 派生能力键列表（供 AvailableActions 同源生成）
func (r *ActionRegistry) CapabilityKeys() []string {
	r.mu.RLock()
	defer r.mu.RUnlock()
	seen := make(map[string]struct{})
	var keys []string
	for _, s := range r.byKey {
		if s.CapabilityKey == "" {
			continue
		}
		if _, ok := seen[s.CapabilityKey]; ok {
			continue
		}
		seen[s.CapabilityKey] = struct{}{}
		keys = append(keys, s.CapabilityKey)
	}
	return keys
}

func registerBuiltinActions(r *ActionRegistry) {
	specs := []ActionSpec{
		{Key: "project.advisory", Domain: "project", Object: "project", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryProgress, CapabilityKey: "QUERY_PROGRESS", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "project.fact.supplement", Domain: "project", Object: "project_fact", Goal: GoalMutate, Risk: RiskMedium, LegacyIntent: IntentSupplementInfo, CapabilityKey: "SUPPLEMENT_INFO", DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "project.stage.advance", Domain: "project", Object: "project", Goal: GoalControl, Risk: RiskHigh, LegacyIntent: IntentAdvanceStage, CapabilityKey: "ADVANCE_STAGE", RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand, DialogueActConfirm}},
		{Key: "task.run", Domain: "project", Object: "task", Goal: GoalGenerate, Risk: RiskMedium, LegacyIntent: IntentTriggerTask, CapabilityKey: "TRIGGER_TASK", DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "task.run.adhoc", Domain: "project", Object: "task", Goal: GoalGenerate, Risk: RiskMedium, LegacyIntent: IntentTriggerAdhocTask, CapabilityKey: "TRIGGER_ADHOC_TASK"},
		{Key: "conversation.chat", Domain: "conversation", Object: "system_ui", Goal: GoalConverse, Risk: RiskLow, LegacyIntent: IntentCasualChat},
		{Key: "conversation.decline", Domain: "conversation", Object: "system_ui", Goal: GoalDecide, Risk: RiskLow, LegacyIntent: IntentDeclineExpectation, DialogueActs: []DialogueAct{DialogueActDecline}},

		{Key: "document.claim", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskMedium, LegacyIntent: IntentDocGovClaim, CapabilityKey: "DOCGOV_CLAIM", DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "document.review.submit", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskMedium, LegacyIntent: IntentDocGovSubmitReview, CapabilityKey: "DOCGOV_SUBMIT_REVIEW", DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "document.review.approve", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskHigh, LegacyIntent: IntentDocGovReviewApprove, RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand, DialogueActConfirm}},
		{Key: "document.review.reject", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskHigh, LegacyIntent: IntentDocGovReviewReject, RequiresConfirm: true, RequiredSlots: []SlotSpec{{Key: SlotRejectReason, Required: true, Label: "驳回理由"}}, DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "document.final.approve", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskHigh, LegacyIntent: IntentDocGovFinalApprove, RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand, DialogueActConfirm}},
		{Key: "document.final.reject", Domain: "document_gov", Object: "controlled_document", Goal: GoalMutate, Risk: RiskHigh, LegacyIntent: IntentDocGovFinalReject, RequiresConfirm: true, RequiredSlots: []SlotSpec{{Key: SlotRejectReason, Required: true, Label: "驳回理由"}}, DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "document.proposal.decide", Domain: "document_gov", Object: "controlled_document", Goal: GoalDecide, Risk: RiskMedium, LegacyIntent: IntentDocGovProposalDecide, DialogueActs: []DialogueAct{DialogueActConfirm, DialogueActDecline}},

		{Key: "regulation.query", Domain: "knowledge", Object: "regulation", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryRegulations, CapabilityKey: "QUERY_REGULATIONS", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "case.query", Domain: "knowledge", Object: "artifact", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQuerySimilarCases, CapabilityKey: "QUERY_SIMILAR_CASES", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "permission.query", Domain: "project", Object: "user_permission", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryUserRights, CapabilityKey: "QUERY_USER_RIGHTS", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "document.reject_reason.query", Domain: "document_gov", Object: "controlled_document", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryRejectReason, DialogueActs: []DialogueAct{DialogueActAsk}},

		{Key: "card.confirm", Domain: "conversation", Object: "system_ui", Goal: GoalDecide, Risk: RiskHigh, LegacyIntent: IntentConfirmAction, RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActConfirm}},
		{Key: "project.stage.execute", Domain: "project", Object: "project", Goal: GoalControl, Risk: RiskHigh, LegacyIntent: IntentExecuteStageAdvance, RequiresConfirm: true},
		{Key: "security.forbidden", Domain: "security", Object: "system_configuration", Goal: GoalConverse, Risk: RiskHigh, LegacyIntent: IntentSecurityForbidden},

		{Key: "workflow.switch", Domain: "project_workflow", Object: "workflow", Goal: GoalControl, Risk: RiskHigh, LegacyIntent: IntentSwitchWorkflow, CapabilityKey: "SWITCH_WORKFLOW", RequiresConfirm: true, RequiredSlots: []SlotSpec{{Key: SlotTargetWorkflow, Required: true, Label: "目标工作流"}}, DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "workflow.run", Domain: "project_workflow", Object: "workflow_run", Goal: GoalControl, Risk: RiskMedium, LegacyIntent: IntentTriggerWorkflow, CapabilityKey: "TRIGGER_WORKFLOW", RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "workflow.status.query", Domain: "project_workflow", Object: "workflow", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryWorkflowStatus, CapabilityKey: "QUERY_WORKFLOW", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "document.status.query", Domain: "document_gov", Object: "controlled_document", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentQueryDocStatus, CapabilityKey: "VIEW_DOC", DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "conversation.help", Domain: "conversation", Object: "system_ui", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentHelpCapabilities, DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "conversation.unsupported", Domain: "conversation", Object: "system_ui", Goal: GoalConverse, Risk: RiskLow, LegacyIntent: IntentUnsupportedAction},

		{Key: "run.status.query", Domain: "project", Object: "workflow_run", Goal: GoalQuery, Risk: RiskLow, LegacyIntent: IntentRunStatusQuery, DialogueActs: []DialogueAct{DialogueActAsk}},
		{Key: "run.resume", Domain: "project", Object: "workflow_run", Goal: GoalControl, Risk: RiskMedium, LegacyIntent: IntentRunResume, RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand}},
		{Key: "run.restart", Domain: "project", Object: "workflow_run", Goal: GoalControl, Risk: RiskHigh, LegacyIntent: IntentRunRestart, RequiresConfirm: true, DialogueActs: []DialogueAct{DialogueActCommand}},
	}
	for _, s := range specs {
		_ = r.Register(s)
	}
}