package server_test

import (
	"bytes"
	"encoding/json"
	"fmt"
	"net/http"
	"net/http/httptest"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"chat-agent-system/internal/bizdev"
	"chat-agent-system/internal/config"
	"chat-agent-system/internal/projectworkflow"
	"chat-agent-system/internal/server"
)

func setupTestServerForProjectWorkflow(t *testing.T) (*server.Server, http.Handler) {
	cfg := &config.Config{
		DataDir:       t.TempDir(),
		AgentBackend:  "stub",
		AllowInMemory: true,
	}
	svc := bizdev.MustNewService(t, cfg)
	srv := server.NewServer(cfg, svc)
	handler := srv.Routes()
	return srv, handler
}

func TestProjectWorkflowAPI_Lifecycle(t *testing.T) {
	_, handler := setupTestServerForProjectWorkflow(t)

	// 1. 未认证创建项目 -> 401
	bodyUnauth, _ := json.Marshal(projectworkflow.CreateProjectInput{
		Name: "未授权项目",
	})
	reqUnauth := httptest.NewRequest(http.MethodPost, "/api/v1/projects", bytes.NewReader(bodyUnauth))
	recUnauth := httptest.NewRecorder()
	handler.ServeHTTP(recUnauth, reqUnauth)
	assert.Equal(t, http.StatusUnauthorized, recUnauth.Code)

	// 2. 认证用户创建项目 (User 2: 张工) -> 201
	bodyCreate, _ := json.Marshal(projectworkflow.CreateProjectInput{
		Name:         "智能高频电刀 (ElectroCutter)",
		DeviceType:   "高频手术设备",
		IntendedUse:  "微创外科软组织切割与止血",
		TargetMarket: "NMPA Class III",
	})
	reqCreate := httptest.NewRequest(http.MethodPost, "/api/v1/projects", bytes.NewReader(bodyCreate))
	withUserIDAuth(reqCreate, loginTestUser(t, handler, "zhanggong", "123456"))
	recCreate := httptest.NewRecorder()
	handler.ServeHTTP(recCreate, reqCreate)
	require.Equal(t, http.StatusCreated, recCreate.Code)

	var createdProj projectworkflow.Project
	err := json.Unmarshal(recCreate.Body.Bytes(), &createdProj)
	require.NoError(t, err)
	assert.Equal(t, int64(2), createdProj.CreatorUserID)
	assert.Equal(t, "planning", createdProj.LifecycleStatus)
	assert.Equal(t, "", createdProj.ActiveWorkflowKey)
	assert.Equal(t, 1, createdProj.WorkflowSelectionVersion)

	// 3. 列出项目列表 -> 包含刚创建的项目
	reqList := httptest.NewRequest(http.MethodGet, "/api/v1/projects", nil)
	withUserIDAuth(reqList, loginTestUser(t, handler, "zhanggong", "123456"))
	recList := httptest.NewRecorder()
	handler.ServeHTTP(recList, reqList)
	assert.Equal(t, http.StatusOK, recList.Code)

	var projList []*projectworkflow.Project
	err = json.Unmarshal(recList.Body.Bytes(), &projList)
	require.NoError(t, err)
	assert.NotEmpty(t, projList)

	// 4. 查询项目挂载的工作流清单 -> 包含 3 个默认工作流
	reqWFs := httptest.NewRequest(http.MethodGet, "/api/v1/projects/1001/workflows", nil)
	recWFs := httptest.NewRecorder()
	handler.ServeHTTP(recWFs, reqWFs)
	assert.Equal(t, http.StatusOK, recWFs.Code)

	var wfList []*projectworkflow.ProjectWorkflow
	err = json.Unmarshal(recWFs.Body.Bytes(), &wfList)
	require.NoError(t, err)
	assert.Equal(t, 3, len(wfList))

	// 5. planning 项目禁止旧式切换 -> 409 Conflict
	bodySwitchBlocked, _ := json.Marshal(projectworkflow.ActivateWorkflowInput{
		WorkflowKey:     "product_manager",
		ExpectedVersion: 1,
		Reason:          "planning 项目应走设置激活",
	})
	reqSwitchBlocked := httptest.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/projects/%d/active-workflow", createdProj.ID), bytes.NewReader(bodySwitchBlocked))
	withUserIDAuth(reqSwitchBlocked, loginTestUser(t, handler, "zhanggong", "123456"))
	recSwitchBlocked := httptest.NewRecorder()
	handler.ServeHTTP(recSwitchBlocked, reqSwitchBlocked)
	assert.Equal(t, http.StatusConflict, recSwitchBlocked.Code)
	assert.Contains(t, recSwitchBlocked.Body.String(), "LEGACY_SWITCH_BLOCKED")

	// 6. 显式 initial_workflow_key 的 legacy 项目：ACL + 切换
	bodyLegacyCreate, _ := json.Marshal(projectworkflow.CreateProjectInput{
		Name:               "Legacy 切换测试项目",
		InitialWorkflowKey: "main",
	})
	reqLegacyCreate := httptest.NewRequest(http.MethodPost, "/api/v1/projects", bytes.NewReader(bodyLegacyCreate))
	withUserIDAuth(reqLegacyCreate, loginTestUser(t, handler, "zhanggong", "123456"))
	recLegacyCreate := httptest.NewRecorder()
	handler.ServeHTTP(recLegacyCreate, reqLegacyCreate)
	require.Equal(t, http.StatusCreated, recLegacyCreate.Code)
	var legacyProj projectworkflow.Project
	require.NoError(t, json.Unmarshal(recLegacyCreate.Body.Bytes(), &legacyProj))
	assert.Equal(t, "main", legacyProj.ActiveWorkflowKey)

	bodySwitchOther, _ := json.Marshal(projectworkflow.ActivateWorkflowInput{
		WorkflowKey:     "product_manager",
		ExpectedVersion: 1,
		Reason:          "非法切换",
	})
	reqSwitchOther := httptest.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/projects/%d/active-workflow", legacyProj.ID), bytes.NewReader(bodySwitchOther))
	withUserIDAuth(reqSwitchOther, loginTestUser(t, handler, "lizhuguan", "123456"))
	recSwitchOther := httptest.NewRecorder()
	handler.ServeHTTP(recSwitchOther, reqSwitchOther)
	assert.Equal(t, http.StatusForbidden, recSwitchOther.Code)

	bodySwitchCreator, _ := json.Marshal(projectworkflow.ActivateWorkflowInput{
		WorkflowKey:     "product_manager",
		ExpectedVersion: 1,
		Reason:          "切换至智能产品经理编制需求",
	})
	reqSwitchCreator := httptest.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/projects/%d/active-workflow", legacyProj.ID), bytes.NewReader(bodySwitchCreator))
	withUserIDAuth(reqSwitchCreator, loginTestUser(t, handler, "zhanggong", "123456"))
	recSwitchCreator := httptest.NewRecorder()
	handler.ServeHTTP(recSwitchCreator, reqSwitchCreator)
	require.Equal(t, http.StatusOK, recSwitchCreator.Code)

	var switchResult projectworkflow.ActivateWorkflowResult
	err = json.Unmarshal(recSwitchCreator.Body.Bytes(), &switchResult)
	require.NoError(t, err)
	assert.Equal(t, "product_manager", switchResult.ActiveWorkflowKey)
	assert.Equal(t, 2, switchResult.Version)

	// 7. 再次用旧版本 1 切换 -> 409 Conflict
	bodySwitchConflict, _ := json.Marshal(projectworkflow.ActivateWorkflowInput{
		WorkflowKey:     "test_manager",
		ExpectedVersion: 1,
		Reason:          "并发冲突测试",
	})
	reqSwitchConflict := httptest.NewRequest(http.MethodPut, fmt.Sprintf("/api/v1/projects/%d/active-workflow", legacyProj.ID), bytes.NewReader(bodySwitchConflict))
	withUserIDAuth(reqSwitchConflict, loginTestUser(t, handler, "zhanggong", "123456"))
	recSwitchConflict := httptest.NewRecorder()
	handler.ServeHTTP(recSwitchConflict, reqSwitchConflict)
	assert.Equal(t, http.StatusConflict, recSwitchConflict.Code)

	// 8. 查询全局工作流规范目录 -> 200 OK
	reqDefs := httptest.NewRequest(http.MethodGet, "/api/v1/workflows", nil)
	recDefs := httptest.NewRecorder()
	handler.ServeHTTP(recDefs, reqDefs)
	assert.Equal(t, http.StatusOK, recDefs.Code)
	var defs []*projectworkflow.Definition
	err = json.Unmarshal(recDefs.Body.Bytes(), &defs)
	require.NoError(t, err)
	assert.Equal(t, 3, len(defs))

	// 9. 触发工作流运行 -> 200 OK
	bodyRun, _ := json.Marshal(map[string]any{
		"task_key":     "intake",
		"project_name": "智能高频电刀",
		"device_type":  "高频手术设备",
		"backend":      "stub",
	})
	reqRun := httptest.NewRequest(http.MethodPost, "/api/v1/projects/1001/workflows/main/run", bytes.NewReader(bodyRun))
	withUserIDAuth(reqRun, loginTestUser(t, handler, "zhanggong", "123456"))
	recRun := httptest.NewRecorder()
	handler.ServeHTTP(recRun, reqRun)
	assert.Equal(t, http.StatusOK, recRun.Code)

	// 10. 查询运行历史 -> 200 OK 且包含刚运行的记录
	reqRuns := httptest.NewRequest(http.MethodGet, "/api/v1/projects/1001/workflows/main/runs", nil)
	recRuns := httptest.NewRecorder()
	handler.ServeHTTP(recRuns, reqRuns)
	assert.Equal(t, http.StatusOK, recRuns.Code)
	var runsList []*projectworkflow.WorkflowRun
	err = json.Unmarshal(recRuns.Body.Bytes(), &runsList)
	require.NoError(t, err)
	assert.NotEmpty(t, runsList)
	assert.Contains(t, []string{"completed", "quality_failed"}, runsList[0].Status)
}

func TestProjectWorkflow_TestManagerAndLineageStale(t *testing.T) {
	srv, handler := setupTestServerForProjectWorkflow(t)

	// 1. 创建测试项目
	bodyCreate, _ := json.Marshal(projectworkflow.CreateProjectInput{
		Name:         "智能肺功能仪",
		DeviceType:   "呼吸诊疗设备",
		IntendedUse:  "肺通气功能评测",
		TargetMarket: "NMPA Class II",
	})
	reqCreate := httptest.NewRequest(http.MethodPost, "/api/v1/projects", bytes.NewReader(bodyCreate))
	withUserIDAuth(reqCreate, loginTestUser(t, handler, "zhanggong", "123456"))
	recCreate := httptest.NewRecorder()
	handler.ServeHTTP(recCreate, reqCreate)
	require.Equal(t, http.StatusCreated, recCreate.Code)
	var proj projectworkflow.Project
	require.NoError(t, json.Unmarshal(recCreate.Body.Bytes(), &proj))
	require.Positive(t, proj.ID)
	projectID := proj.ID

	// 2. 无已批准 SRS 时，test_manager 仍可独立启动（PM/TE 解耦）
	bodyRunTestNoSRS, _ := json.Marshal(map[string]any{
		"task_key":     "test_manager",
		"project_name": proj.Name,
		"backend":      "stub",
	})
	reqRunTestNoSRS := httptest.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/projects/%d/workflows/test_manager/run", projectID), bytes.NewReader(bodyRunTestNoSRS))
	withUserIDAuth(reqRunTestNoSRS, loginTestUser(t, handler, "zhanggong", "123456"))
	recRunTestNoSRS := httptest.NewRecorder()
	handler.ServeHTTP(recRunTestNoSRS, reqRunTestNoSRS)
	assert.Equal(t, http.StatusOK, recRunTestNoSRS.Code)
	assert.NotContains(t, recRunTestNoSRS.Body.String(), "前置条件未满足")

	// 3. 在受控治理中创建并批准系统需求规格书
	srDocID := fmt.Sprintf("doc_proj%d_system_reqs", projectID)
	_, err := srv.BizdevService().DocGov().CreateOrGetDocument(
		nil, srDocID, projectID, "system_reqs", "系统需求规格书",
		"V0.5_feasibility", "",
		2, "张工", 3, "李主管", 4, "王总监",
	)
	require.NoError(t, err)
	_ = srv.BizdevService().DocGov().MarkDocumentContentUpdated(nil, srDocID, "hash_v1", false)
	_, _ = srv.BizdevService().DocGov().SubmitForReview(nil, srDocID, 2, "author", "张工")
	_, _ = srv.BizdevService().DocGov().ReviewApprove(nil, srDocID, 3, "reviewer", "李主管", "同意")
	approvedDoc, err := srv.BizdevService().DocGov().ApproverApprove(nil, srDocID, 4, "approver", "王总监", "批准生效")
	require.NoError(t, err)
	assert.Equal(t, "approved", string(approvedDoc.CurrentState))

	// 4. 前置已批准后，触发 test_manager 运行 -> 成功 200
	bodyRunTestSuccess, _ := json.Marshal(map[string]any{
		"task_key":     "test_manager",
		"project_name": proj.Name,
		"backend":      "stub",
	})
	reqRunTestSuccess := httptest.NewRequest(http.MethodPost, fmt.Sprintf("/api/v1/projects/%d/workflows/test_manager/run", projectID), bytes.NewReader(bodyRunTestSuccess))
	withUserIDAuth(reqRunTestSuccess, loginTestUser(t, handler, "zhanggong", "123456"))
	recRunTestSuccess := httptest.NewRecorder()
	handler.ServeHTTP(recRunTestSuccess, reqRunTestSuccess)
	if recRunTestSuccess.Code != http.StatusOK {
		t.Fatalf("test_manager run failed: %d %s", recRunTestSuccess.Code, recRunTestSuccess.Body.String())
	}

	// 5. 查询文档血缘 -> 存在且 is_stale == false
	lineageDocID := fmt.Sprintf("doc_proj%d_test_manager", projectID)
	lineageToken := loginTestUser(t, handler, "zhanggong", "123456")
	reqLineage := httptest.NewRequest(http.MethodGet, fmt.Sprintf("/api/v1/projects/%d/lineage?doc_id=%s", projectID, lineageDocID), nil)
	withUserIDAuth(reqLineage, lineageToken)
	recLineage := httptest.NewRecorder()
	handler.ServeHTTP(recLineage, reqLineage)
	assert.Equal(t, http.StatusOK, recLineage.Code)
	var lineages []*projectworkflow.DocumentLineage
	_ = json.Unmarshal(recLineage.Body.Bytes(), &lineages)
	require.NotEmpty(t, lineages)
	assert.Equal(t, srDocID, lineages[0].UpstreamDocID)
	assert.False(t, lineages[0].IsStale)

	// 6. 上游 system_reqs 发生更新（模拟触发 CheckAndPropagateStale）
	_, err = srv.ProjectWorkflowService().CheckAndPropagateStale(nil, srDocID, "hash_v2_changed", "需求发生重大变更")
	require.NoError(t, err)

	// 再次查询下游血缘 -> is_stale 应变为 true
	recLineage2 := httptest.NewRecorder()
	handler.ServeHTTP(recLineage2, reqLineage)
	var lineagesAfter []*projectworkflow.DocumentLineage
	_ = json.Unmarshal(recLineage2.Body.Bytes(), &lineagesAfter)
	require.NotEmpty(t, lineagesAfter)
	assert.True(t, lineagesAfter[0].IsStale)
}