package server

import (
	"bufio"
	"bytes"
	"context"
	"crypto/sha256"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"chat-agent-system/internal/bizdev"
	"chat-agent-system/internal/chat"
	"chat-agent-system/internal/config"
	"chat-agent-system/internal/stream"
)

func newTestServer(t testing.TB) *Server {
	t.Helper()
	cfg := &config.Config{
		Env:           "test",
		AgentBackend:  "stub",
		DataDir:       t.TempDir(),
		KbDbPort:      5432,
		AdminUsername: "admin",
		AdminPassword: "admin-test-pass",
	}
	svc := bizdev.MustNewService(t, cfg)
	return NewServer(cfg, svc)
}

func TestServer_Health(t *testing.T) {
	srv := newTestServer(t)
	req := httptest.NewRequest(http.MethodGet, "/api/v1/health", nil)
	w := httptest.NewRecorder()

	srv.Routes().ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d", w.Code)
	}

	var resp HealthResponse
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response failed: %v", err)
	}

	if resp.Status != "ok" || resp.Env != "test" {
		t.Errorf("unexpected health response: %+v", resp)
	}
}

func TestServer_ChatBlocking(t *testing.T) {
	srv := newTestServer(t)

	chatReq := ChatRequest{
		SessionID:    "test_sess_01",
		Message:      "查一下当前进展",
		ProjectName:  "内窥镜研发项目",
		CustomerName: "水木东方",
	}
	body, _ := json.Marshal(chatReq)
	req := httptest.NewRequest(http.MethodPost, "/api/v1/chat", bytes.NewReader(body))
	withBearerAuth(req, loginTestAdmin(t, srv))
	w := httptest.NewRecorder()

	srv.Routes().ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d: %s", w.Code, w.Body.String())
	}

	var resp chat.ChatResponse
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("decode chat response failed: %v", err)
	}

	if resp.ReplyText == "" {
		t.Errorf("expected non-empty reply text")
	}
}

func TestServer_ChatDocumentSummaryReadsExistingDocumentWithoutWriteAction(t *testing.T) {
	srv := newTestServer(t)
	ctx := context.Background()
	workDir := t.TempDir()
	markdown := []byte("# 用户初始需求收集表\n\n## 核心需求\n确认临床使用场景。\n\n## 待确认\n目标市场尚待确认。\n")
	if err := os.WriteFile(filepath.Join(workDir, "output.md"), markdown, 0o644); err != nil {
		t.Fatalf("write output.md: %v", err)
	}
	if _, err := srv.svc.DocGov().CreateOrGetDocument(
		ctx, "doc_proj143_intake", 143, "intake", "用户初始需求收集表", "V0.1_triage", workDir,
		1, "编制人", 1, "审核人", 1, "批准人",
	); err != nil {
		t.Fatalf("create document: %v", err)
	}
	hash := fmt.Sprintf("%x", sha256.Sum256(markdown))
	if err := srv.svc.DocGov().MarkDocumentContentUpdated(ctx, "doc_proj143_intake", hash, false); err != nil {
		t.Fatalf("mark content: %v", err)
	}

	body, _ := json.Marshal(ChatRequest{
		SessionID:   "fixture-doc-summary",
		Message:     "总结一下用户初始需求表",
		ProjectID:   143,
		ProjectName: "隔离验收项目",
	})
	req := httptest.NewRequest(http.MethodPost, "/api/v1/chat", bytes.NewReader(body))
	withBearerAuth(req, loginTestAdmin(t, srv))
	w := httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d: %s", w.Code, w.Body.String())
	}

	var resp chat.ChatResponse
	if err := json.NewDecoder(w.Body).Decode(&resp); err != nil {
		t.Fatalf("decode response: %v", err)
	}
	if resp.IntentResult == nil || resp.IntentResult.TopIntent == nil || resp.IntentResult.TopIntent.Intent != "QUERY_DOC_STATUS" {
		t.Fatalf("unexpected intent: %+v", resp.IntentResult)
	}
	if got := resp.IntentResult.TopIntent.FilledSlots["query_topic"]; got != "doc_summary" {
		t.Fatalf("query_topic=%q", got)
	}
	if resp.CoordinationResult == nil || resp.CoordinationResult.PendingAction != nil {
		t.Fatalf("summary must not expose a write action: %+v", resp.CoordinationResult)
	}
	if !strings.Contains(resp.ReplyText, "目标市场") || !strings.Contains(resp.ReplyText, "用户初始需求收集表") {
		t.Fatalf("reply does not summarize existing content: %s", resp.ReplyText)
	}
}

func TestServer_ChatSSEStream(t *testing.T) {
	srv := newTestServer(t)

	chatReq := StreamChatRequest{
		SessionID:      "test_sess_sse",
		Message:        "查一下当前进展",
		IncludeDetails: false,
		ProjectName:    "内窥镜研发项目",
		CustomerName:   "水木东方",
	}
	body, _ := json.Marshal(chatReq)
	req := httptest.NewRequest(http.MethodPost, "/api/v1/chat/stream", bytes.NewReader(body))
	withBearerAuth(req, loginTestAdmin(t, srv))
	w := httptest.NewRecorder()

	srv.Routes().ServeHTTP(w, req)

	if w.Code != http.StatusOK {
		t.Fatalf("expected status 200, got %d", w.Code)
	}

	contentType := w.Header().Get("Content-Type")
	if !strings.Contains(contentType, "text/event-stream") {
		t.Fatalf("expected Content-Type text/event-stream, got %s", contentType)
	}

	// 解析 SSE 事件流
	scanner := bufio.NewScanner(w.Body)
	var currentEvent string
	var eventsReceived []string

	for scanner.Scan() {
		line := scanner.Text()
		if strings.HasPrefix(line, "event: ") {
			currentEvent = strings.TrimPrefix(line, "event: ")
		} else if strings.HasPrefix(line, "data: ") {
			dataStr := strings.TrimPrefix(line, "data: ")
			var ev stream.StreamEvent
			if err := json.Unmarshal([]byte(dataStr), &ev); err == nil {
				eventsReceived = append(eventsReceived, currentEvent)
			}
		}
	}

	if len(eventsReceived) == 0 {
		t.Fatalf("expected to receive SSE events, got 0")
	}

	hasPhase := false
	hasStatus := false
	hasDone := false

	for _, et := range eventsReceived {
		switch et {
		case "phase":
			hasPhase = true
		case "status":
			hasStatus = true
		case "done":
			hasDone = true
		}
	}

	if !hasPhase {
		t.Errorf("expected phase event in SSE stream")
	}
	if !hasStatus {
		t.Errorf("expected status event in SSE stream")
	}
	if !hasDone {
		t.Errorf("expected done event in SSE stream")
	}
}

func TestServer_ContextAndDocGovAPIs(t *testing.T) {
	srv := newTestServer(t)
	token := loginTestAdmin(t, srv)
	actorID := int64(1)

	// 1. 测试更新并获取用户偏好
	prefReq := UpdateUserPreferenceRequest{
		UserID:             101,
		CommunicationStyle: "concise_structured",
		FocusAreas:         []string{"cost_budget", "reg_compliance"},
		OutputFormatPref:   "standard_report",
		CustomInstructions: "结论先行，重点突出NMPA二类申报风险",
	}
	prefBytes, _ := json.Marshal(prefReq)
	req := httptest.NewRequest(http.MethodPut, "/api/v1/context/user/preference", bytes.NewReader(prefBytes))
	withBearerAuth(req, token)
	w := httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from update user preference, got %d", w.Code)
	}

	// 2. 测试获取单用户上下文
	req = httptest.NewRequest(http.MethodGet, "/api/v1/context/user?user_id=101&project_id=1", nil)
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from get user context, got %d", w.Code)
	}

	// 3. 测试获取项目事实黑板上下文
	req = httptest.NewRequest(http.MethodGet, "/api/v1/context/project?project_id=1", nil)
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from get project context, got %d", w.Code)
	}

	// 4. 测试任务运行与文档生成
	taskReq := TaskRunRequestDTO{
		TaskKey:      "feasibility_reg",
		ProjectID:    1,
		ProjectName:  "超声骨刀系统",
		CustomerName: "北京水木东方",
		DeviceType:   "超声手术设备",
		UserID:       actorID,
		AuthorID:     actorID,
		AuthorName:   "张工",
		ReviewerID:   actorID,
		ReviewerName: "李主管",
		ApproverID:   actorID,
		ApproverName: "王总监",
	}
	taskBytes, _ := json.Marshal(taskReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/tasks/run", bytes.NewReader(taskBytes))
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from tasks/run, got %d: %s", w.Code, w.Body.String())
	}
	var taskRes bizdev.TaskRunResult
	if err := json.NewDecoder(w.Body).Decode(&taskRes); err != nil {
		t.Fatalf("decode task run result: %v", err)
	}
	docID := "doc_proj1_feasibility_reg"
	if taskRes.DocRecord != nil && taskRes.DocRecord.DocID != "" {
		docID = taskRes.DocRecord.DocID
	}

	// 5. 查询生成的受控文档
	req = httptest.NewRequest(http.MethodGet, "/api/v1/docgov/document?doc_id="+docID, nil)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from get docgov document, got %d", w.Code)
	}

	// 6. 查阅并认领文档
	claimReq := DocGovClaimRequest{
		DocID:    docID,
		UserID:   101,
		UserName: "张工",
		UserRole: "author",
	}
	claimBytes, _ := json.Marshal(claimReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/claim", bytes.NewReader(claimBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from claim doc, got %d", w.Code)
	}

	// 7. 已认领文档再次运行被拦截，生成变更提案
	taskReq2 := taskReq
	taskReq2.TargetMarket = "欧盟CE"
	taskBytes2, _ := json.Marshal(taskReq2)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/tasks/run", bytes.NewReader(taskBytes2))
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 with proposal from tasks/run, got %d", w.Code)
	}
	var interceptedRes bizdev.TaskRunResult
	_ = json.NewDecoder(w.Body).Decode(&interceptedRes)
	if !interceptedRes.RequiresAuthorApproval || interceptedRes.PendingProposal == nil {
		t.Fatalf("expected RequiresAuthorApproval=true and non-nil PendingProposal")
	}

	// 8. 编制人拍板同意变更提案
	decideReq := DecideProposalRequest{
		ProposalID: interceptedRes.PendingProposal.ProposalID,
		AuthorID:   101,
		Approve:    true,
		Reason:     "经评估符合出海战略，同意增补CE条款",
	}
	decideBytes, _ := json.Marshal(decideReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/proposal/decide", bytes.NewReader(decideBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from proposal/decide, got %d", w.Code)
	}

	// 9. 添加批注
	commReq := AddCommentRequestDTO{
		DocID:         docID,
		UserID:        102,
		UserName:      "李主管",
		UserRole:      "reviewer",
		TargetSection: "## 法规结论",
		CommentType:   "suggestion",
		Content:       "建议补充针对大血管闭合的YY/T 0644条款",
	}
	commBytes, _ := json.Marshal(commReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/comments", bytes.NewReader(commBytes))
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from add comment, got %d", w.Code)
	}

	// 10. 送审
	submitReq := DocGovSubmitReviewRequest{
		DocID:    docID,
		UserID:   101,
		UserName: "张工",
	}
	submitBytes, _ := json.Marshal(submitReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/submit-review", bytes.NewReader(submitBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from submit review, got %d", w.Code)
	}

	// 11. 审核驳回校验 (空原因应被拦截)
	rejReq := DocGovDecisionRequest{
		DocID:    docID,
		UserID:   102,
		UserName: "李主管",
		Action:   "reject",
		Reason:   "",
	}
	rejBytes, _ := json.Marshal(rejReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/review-decision", bytes.NewReader(rejBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusBadRequest {
		t.Fatalf("expected 400 for empty reject reason, got %d", w.Code)
	}

	// 12. 审核通过
	appReq := DocGovDecisionRequest{
		DocID:    docID,
		UserID:   102,
		UserName: "李主管",
		Action:   "approve",
		Comment:  "初审符合注册法规要求，同意转交批准",
	}
	appBytes, _ := json.Marshal(appReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/review-decision", bytes.NewReader(appBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 for review approve, got %d", w.Code)
	}

	// 13. 批准人批准
	apprReq := DocGovDecisionRequest{
		DocID:    docID,
		UserID:   103,
		UserName: "王总监",
		Action:   "approve",
		Comment:  "准予受控生效",
	}
	apprBytes, _ := json.Marshal(apprReq)
	req = httptest.NewRequest(http.MethodPost, "/api/v1/docgov/approver-decision", bytes.NewReader(apprBytes))
	withBearerAuth(req, token)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 for approver approve, got %d", w.Code)
	}

	// 14. 查询审计日志
	req = httptest.NewRequest(http.MethodGet, "/api/v1/docgov/audit-logs?doc_id="+docID, nil)
	w = httptest.NewRecorder()
	srv.Routes().ServeHTTP(w, req)
	if w.Code != http.StatusOK {
		t.Fatalf("expected 200 from audit logs, got %d", w.Code)
	}
}