package runtime

import (
	"context"
	"encoding/json"
	"strings"
	"testing"

	ai "code.tczkiot.com/wlw/ai-agent/internal/ai"
	"code.tczkiot.com/wlw/ai-agent/internal/models"
	"code.tczkiot.com/wlw/ai-agent/internal/pkg/dto/request"
	"code.tczkiot.com/wlw/ai-agent/internal/pkg/enums"
	svc "code.tczkiot.com/wlw/ai-agent/internal/services"

	"github.com/glebarez/sqlite"
	"github.com/mlogclub/simple/sqls"
	"gorm.io/gorm"
)

func TestAgentLoopActivatesSkillInsideSameToolLoop(t *testing.T) {
	skill := models.SkillDefinition{
		ID: 7, Name: "退款说明", Instruction: "只根据退款政策回答。",
		ToolWhitelist: `["builtin/knowledge_retrieve"]`, Status: enums.StatusOk,
	}
	turn := agentLoopTurn{
		AllowedTools: []string{"skill/7"},
		ToolPolicy:   parseAgentLoopToolPolicy(""),
		Skills:       map[int64]models.SkillDefinition{skill.ID: skill},
	}
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(RunInput{}, turn, &state, &calls)

	result, err := execute(context.Background(), ai.ToolCall{
		Name: "tool_search", Arguments: `{"toolCode":"skill/7","arguments":{}}`,
	})
	if err != nil {
		t.Fatalf("activate Skill: %v", err)
	}
	if state.SkillContext.SkillID() != skill.ID || !strings.Contains(result, skill.Instruction) {
		t.Fatalf("Skill was not activated in the Agent Loop: state=%#v result=%q", state, result)
	}
	if len(calls) != 1 || calls[0].ToolCode != "skill/7" || calls[0].Status != "completed" {
		t.Fatalf("unexpected Skill audit: %#v", calls)
	}
}

func TestAgentLoopRegistersDirectCapabilityAliases(t *testing.T) {
	turn := agentLoopTurn{AllowedTools: []string{
		"builtin/conversation_context",
		"graph/triage_service_request",
		"graph/triage_service_request",
		"workflow/47",
	}}
	definitions := agentLoopToolDefinitions(turn)
	names := make(map[string]bool, len(definitions))
	for _, definition := range definitions {
		names[definition.Name] = true
	}
	for _, expected := range []string{
		"tool_search",
		"builtin/conversation_context",
		"graph/triage_service_request",
		"workflow/47",
	} {
		if !names[expected] {
			t.Fatalf("missing registered function alias %q: %#v", expected, definitions)
		}
	}
}

func TestConversationDecisionIsStructuredAndValidated(t *testing.T) {
	decision, err := parseConversationDecision(`{"action":"handoff","reason":"customer requested a human","reply":"","handoffInitiator":"customer","handoffConfirmed":true}`)
	if err != nil {
		t.Fatalf("parse handoff decision: %v", err)
	}
	if decision.Action != ConversationActionHandoff || decision.Reason != "customer requested a human" {
		t.Fatalf("unexpected handoff decision: %#v", decision)
	}
	for _, raw := range []string{
		`{"action":"unknown","reason":"x","reply":"x","handoffInitiator":"none","handoffConfirmed":false}`,
		`{"action":"reply","reason":"x","reply":"","handoffInitiator":"none","handoffConfirmed":false}`,
		`{"action":"ask_handoff_confirmation","reason":"x","reply":"confirm?","handoffInitiator":"customer","handoffConfirmed":false}`,
	} {
		if _, err := parseConversationDecision(raw); err == nil {
			t.Fatalf("expected invalid decision to fail: %s", raw)
		}
	}
}

func TestAgentLoopRecordsConversationDecision(t *testing.T) {
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(RunInput{}, agentLoopTurn{}, &state, &calls)
	if _, err := execute(context.Background(), ai.ToolCall{
		Name: "conversation_decision", Arguments: `{"action":"handoff","reason":"customer requested a human","reply":"","handoffInitiator":"customer","handoffConfirmed":true}`,
	}); err != nil {
		t.Fatalf("record decision: %v", err)
	}
	if state.Decision == nil || state.Decision.Action != ConversationActionHandoff {
		t.Fatalf("decision was not stored: %#v", state.Decision)
	}
	if len(calls) != 1 || calls[0].ToolCode != "conversation_decision" || calls[0].Status != "completed" {
		t.Fatalf("decision audit missing: %#v", calls)
	}
}

func TestResolveAgentLoopReplyKeepsNormalModelReplyWithoutDecision(t *testing.T) {
	reply, handoff, reason, err := resolveAgentLoopReply("你好，有什么可以帮你？", nil)
	if err != nil || handoff || reason != "" || reply != "你好，有什么可以帮你？" {
		t.Fatalf("unexpected normal reply resolution: reply=%q handoff=%t reason=%q err=%v", reply, handoff, reason, err)
	}
}

func TestResolveAgentLoopReplyUsesStructuredHandoffDecision(t *testing.T) {
	reply, handoff, reason, err := resolveAgentLoopReply("模型自由文本不应生效", &ConversationDecision{
		Action: ConversationActionHandoff, Reason: "customer requested human support", HandoffInitiator: HandoffInitiatorCustomer, HandoffConfirmed: true,
	})
	if err != nil || !handoff || reply != "" || reason != "customer requested human support" {
		t.Fatalf("unexpected handoff resolution: reply=%q handoff=%t reason=%q err=%v", reply, handoff, reason, err)
	}
}

func TestNormalizeAgentLoopReplyAllowsEmptyInternalHandoff(t *testing.T) {
	reply, err := normalizeAgentLoopReply("", true)
	if err != nil || reply != "" {
		t.Fatalf("handoff must bypass customer reply normalization: reply=%q err=%v", reply, err)
	}
	if _, err := normalizeAgentLoopReply("", false); err == nil {
		t.Fatal("ordinary empty model replies must still be rejected")
	}
}

func TestAgentLoopDirectCapabilityAliasUsesSamePolicyBoundary(t *testing.T) {
	skill := models.SkillDefinition{
		ID: 7, Name: "售后升级处理", Instruction: "先确认升级诉求。", Status: enums.StatusOk,
	}
	turn := agentLoopTurn{
		AllowedTools: []string{"skill/7"},
		ToolPolicy:   parseAgentLoopToolPolicy(""),
		Skills:       map[int64]models.SkillDefinition{skill.ID: skill},
	}
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(RunInput{}, turn, &state, &calls)

	result, err := execute(context.Background(), ai.ToolCall{Name: "skill/7", Arguments: `{}`})
	if err != nil {
		t.Fatalf("execute direct capability alias: %v", err)
	}
	if state.SkillContext.SkillID() != skill.ID || !strings.Contains(result, skill.Instruction) {
		t.Fatalf("direct capability was not routed through Skill activation: state=%#v result=%q", state, result)
	}
	if len(calls) != 1 || calls[0].ToolCode != "skill/7" || calls[0].Status != "completed" {
		t.Fatalf("unexpected direct capability audit: %#v", calls)
	}
}

func TestAgentLoopInterruptsBeforeWriteMCPTool(t *testing.T) {
	configured, err := json.Marshal([]request.AIAgentMCPToolRequest{{
		ToolCode: "crm/update_customer", ServerCode: "crm", ToolName: "update_customer",
		Title: "更新客户", RiskLevel: "write", RequireConfirmation: true,
	}})
	if err != nil {
		t.Fatalf("marshal MCP configuration: %v", err)
	}
	runInput := RunInput{
		Conversation: models.Conversation{ID: 9},
		AIAgent:      models.AIAgent{AllowedMCPTools: string(configured)},
	}
	turn := agentLoopTurn{
		AllowedTools: []string{"crm/update_customer"},
		ToolPolicy:   parseAgentLoopToolPolicy(`{"allowedRiskLevels":["read","write"]}`),
	}
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(runInput, turn, &state, &calls)

	_, err = execute(context.Background(), ai.ToolCall{
		Name: "tool_search", Arguments: `{"toolCode":"crm/update_customer","arguments":{"name":"Ada"}}`,
	})
	if err == nil {
		t.Fatal("expected write MCP Tool to interrupt")
	}
	if state.Interrupted == nil || !state.Interrupted.Interrupted || !strings.HasPrefix(state.Interrupted.CheckPointID, "tool:9:") {
		t.Fatalf("missing MCP confirmation checkpoint: %#v", state.Interrupted)
	}
	if state.Interrupted.ReplyText != "即将执行“更新客户”，是否确认继续？" ||
		len(state.Interrupted.Interrupts) != 1 ||
		state.Interrupted.Interrupts[0].PromptText != state.Interrupted.ReplyText {
		t.Fatalf("unexpected customer confirmation prompt: %#v", state.Interrupted)
	}
	if len(calls) != 1 || calls[0].RiskLevel != "write" || !calls[0].RequireConfirm || calls[0].Status != "interrupted" {
		t.Fatalf("unexpected MCP safety audit: %#v", calls)
	}
}

func TestAgentLoopRejectsWriteMCPBeforeConfirmationWhenRiskIsNotAllowed(t *testing.T) {
	configured, _ := json.Marshal([]request.AIAgentMCPToolRequest{{
		ToolCode: "crm/update_customer", ServerCode: "crm", ToolName: "update_customer",
		Title: "更新客户", RiskLevel: "write", RequireConfirmation: true,
	}})
	runInput := RunInput{
		Conversation: models.Conversation{ID: 9},
		AIAgent:      models.AIAgent{AllowedMCPTools: string(configured)},
	}
	turn := agentLoopTurn{
		AllowedTools: []string{"crm/update_customer"},
		ToolPolicy:   parseAgentLoopToolPolicy(`{"allowedRiskLevels":["read"]}`),
	}
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(runInput, turn, &state, &calls)

	_, err := execute(context.Background(), ai.ToolCall{
		Name: "tool_search", Arguments: `{"toolCode":"crm/update_customer","arguments":{"name":"Ada"}}`,
	})
	if err == nil || !strings.Contains(err.Error(), "risk level") {
		t.Fatalf("expected MCP risk policy rejection, got %v", err)
	}
	if state.Interrupted != nil || len(calls) != 1 || calls[0].Status != "failed" {
		t.Fatalf("disallowed MCP call should fail without a checkpoint: state=%#v calls=%#v", state, calls)
	}
}

func TestAgentLoopRejectsWorkflowWhenWriteRiskIsNotAllowed(t *testing.T) {
	turn := agentLoopTurn{
		AllowedTools: []string{"workflow/23"},
		ToolPolicy:   parseAgentLoopToolPolicy(`{"allowedRiskLevels":["read"]}`),
		Workflows: map[int64]svc.AgentRevisionWorkflowBinding{
			23: {WorkflowVersionID: 23, ToolName: "创建工单"},
		},
	}
	state := agentLoopExecutionState{}
	var calls []svc.AgentLoopToolCallInput
	execute := NewAgentLoopEngine().toolSearchExecutor(RunInput{}, turn, &state, &calls)

	_, err := execute(context.Background(), ai.ToolCall{
		Name: "tool_search", Arguments: `{"toolCode":"workflow/23","arguments":{}}`,
	})
	if err == nil || !strings.Contains(err.Error(), "risk level") {
		t.Fatalf("expected Workflow risk policy rejection, got %v", err)
	}
	if len(calls) != 1 || calls[0].Status != "failed" || calls[0].RiskLevel != "write" {
		t.Fatalf("unexpected Workflow policy audit: %#v", calls)
	}
}

func TestAgentLoopKnowledgeFallbackCanRequestHandoff(t *testing.T) {
	agent := models.AIAgent{
		KnowledgeIDs: "1", FallbackMode: enums.AIAgentFallbackModeHandoff,
		FallbackMessage: "我暂时无法核实，马上为你转人工。",
	}
	policy := evaluateAgentLoopResponsePolicy(agent, "", nil)
	prompt := buildAgentLoopSystemPrompt(agent, true, "", nil)
	if !policy.RequestHandoff || !strings.Contains(prompt, agent.FallbackMessage) {
		t.Fatalf("knowledge fallback was not applied: policy=%#v prompt=%q", policy, prompt)
	}
}

func TestAgentLoopConfirmationNormalizesHTMLAndKeepsUnknownPending(t *testing.T) {
	data := normalizeAgentLoopResumeData(enums.IMMessageTypeHTML, map[string]string{
		"message": "<p>确认。</p>",
	})
	if got := parseAgentLoopConfirmation(firstAgentLoopResumeText(data)); got != agentLoopConfirmationConfirmed {
		t.Fatalf("expected HTML confirmation, got %v from %#v", got, data)
	}
	if got := parseAgentLoopConfirmation("取消！"); got != agentLoopConfirmationCancelled {
		t.Fatalf("expected cancellation, got %v", got)
	}
	if got := parseAgentLoopConfirmation("稍后再说"); got != agentLoopConfirmationUnknown {
		t.Fatalf("ambiguous input must stay pending, got %v", got)
	}
}

func TestConfiguredMCPToolAppliesTrustedSystemPolicy(t *testing.T) {
	configured, _ := json.Marshal([]request.AIAgentMCPToolRequest{{
		ToolCode:            "system/server_time",
		ServerCode:          "system",
		ToolName:            "server_time",
		Title:               "server_time",
		RiskLevel:           "write",
		RequireConfirmation: true,
	}})
	tool, err := configuredMCPTool(string(configured), "system/server_time")
	if err != nil {
		t.Fatalf("resolve configured system tool: %v", err)
	}
	if tool.Title != "获取当前时间" || tool.RiskLevel != "read" || tool.RequireConfirmation {
		t.Fatalf("trusted policy was not applied at runtime: %#v", tool)
	}
}

func TestAgentLoopPromptAvoidsRepeatingWelcomeMessage(t *testing.T) {
	prompt := buildAgentLoopSystemPrompt(models.AIAgent{}, false, "", nil)
	if !strings.Contains(prompt, "without repeating the welcome wording") {
		t.Fatalf("conversation continuity instruction missing: %q", prompt)
	}
}

func TestCompleteConfirmedMCPReplyGeneratesCustomerFacingAnswerWithoutTools(t *testing.T) {
	engine := NewAgentLoopEngine()
	var systemPrompt string
	var userPrompt string
	engine.complete = func(_ context.Context, _ models.AIConfig, system, user string) (*ai.ChatCompletionResult, error) {
		systemPrompt = system
		userPrompt = user
		return &ai.ChatCompletionResult{
			Content:          "当前服务端时间是 2026-07-28 11:51:52。",
			ModelName:        "test-model",
			PromptTokens:     20,
			CompletionTokens: 10,
		}, nil
	}

	result, err := engine.completeConfirmedMCPReply(
		context.Background(),
		models.AIAgent{},
		models.AIConfig{ModelName: "test-model"},
		"获取当前时间",
		"现在几点钟？",
		`{"timestamp":"2026-07-28 11:51:52","timezone":"Local"}`,
	)
	if err != nil {
		t.Fatalf("complete confirmed MCP reply: %v", err)
	}
	if result.Content != "当前服务端时间是 2026-07-28 11:51:52。" {
		t.Fatalf("unexpected customer reply: %#v", result)
	}
	for _, expected := range []string{
		"Do not request or invoke another tool",
		"现在几点钟？",
		"获取当前时间",
		`"timestamp":"2026-07-28 11:51:52"`,
	} {
		if !strings.Contains(systemPrompt+"\n"+userPrompt, expected) {
			t.Fatalf("post-tool completion context missing %q: system=%q user=%q", expected, systemPrompt, userPrompt)
		}
	}
}

func TestConfirmedMCPReplyFallbackDoesNotExposeRawResult(t *testing.T) {
	got := buildAgentLoopConfirmedMCPFallback("获取当前时间")
	if got != "“获取当前时间”已成功执行。" || strings.Contains(got, "{") {
		t.Fatalf("unexpected confirmed MCP fallback: %q", got)
	}
}

func TestAgentTurnPublishesAllConfiguredCapabilityKinds(t *testing.T) {
	db, err := gorm.Open(sqlite.Open("file:"+strings.ReplaceAll(t.Name(), "/", "_")+"?mode=memory&cache=shared"), &gorm.Config{})
	if err != nil {
		t.Fatalf("open sqlite: %v", err)
	}
	if err := db.AutoMigrate(&models.SkillDefinition{}); err != nil {
		t.Fatalf("migrate Skill: %v", err)
	}
	sqls.SetDB(db)
	skill := models.SkillDefinition{Name: "订单查询", Description: "查询订单状态", Status: enums.StatusOk}
	if err := db.Create(&skill).Error; err != nil {
		t.Fatalf("create Skill: %v", err)
	}
	mcp, _ := json.Marshal([]request.AIAgentMCPToolRequest{{
		ToolCode: "crm/get_customer", ServerCode: "crm", ToolName: "get_customer",
		RiskLevel: "read",
	}})
	agent := models.AIAgent{SkillIDs: jsonInt64List(skill.ID), AllowedMCPTools: string(mcp)}
	snapshot := &svc.AgentRevisionSnapshot{
		Agent: agent,
		WorkflowBindings: []svc.AgentRevisionWorkflowBinding{{
			WorkflowVersionID: 23, ToolName: "创建工单", TriggerInstruction: "用户要求创建工单",
		}},
	}
	engine := NewAgentLoopEngine()
	engine.retrieve = nil
	engine.history = nil
	turn := engine.prepareTurn(context.Background(), RunInput{AIAgent: agent}, snapshot)

	for _, code := range []string{"skill/" + jsonInt64List(skill.ID), "workflow/23", "crm/get_customer"} {
		if !strings.Contains(turn.SystemPrompt, code) {
			t.Fatalf("capability %q missing from prompt:\n%s", code, turn.SystemPrompt)
		}
	}
}

func jsonInt64List(id int64) string {
	data, _ := json.Marshal([]int64{id})
	return strings.Trim(string(data), "[]")
}