package projectinstance

import (
	"context"
	"errors"
	"testing"

	"chat-agent-system/internal/workflowdef"
)

type stubVersionResolver struct {
	versions map[string]*workflowdef.Version
	defs     map[string]*workflowdef.Definition
}

func (s *stubVersionResolver) GetDefinitionByKey(_ context.Context, key string) (*workflowdef.Definition, error) {
	d, ok := s.defs[key]
	if !ok {
		return nil, workflowdef.ErrNotFound
	}
	return d, nil
}

func (s *stubVersionResolver) GetVersion(_ context.Context, workflowID int64, version int) (*workflowdef.Version, error) {
	for _, v := range s.versions {
		if v.WorkflowID == workflowID && v.Version == version {
			copyV := *v
			return &copyV, nil
		}
	}
	return nil, workflowdef.ErrNotFound
}

func (s *stubVersionResolver) ListDefinitions(_ context.Context) ([]workflowdef.Definition, error) {
	out := make([]workflowdef.Definition, 0, len(s.defs))
	for _, d := range s.defs {
		out = append(out, *d)
	}
	return out, nil
}

func testResolver() *stubVersionResolver {
	key := workflowdef.OfficialKeyMain
	ver := &workflowdef.Version{
		ID: 100, WorkflowID: 10, Version: 1, Status: workflowdef.StatusPublished,
		WorkflowKey: key, WorkflowName: workflowdef.OfficialWorkflowName(key),
		Definition: workflowdef.VersionDefinition{
			SchemaVersion: 2,
			WorkflowKey:   key,
			Stages: []workflowdef.StageDef{{
				Key: "V0.1_triage", Name: "V0.1 需求摸底", Optional: false, Position: 10,
				DocTasks: []workflowdef.DocTaskDef{{
					Key: "intake", Title: "用户初始需求收集表", CreatorConfigurable: true, BlockingWhenEnabled: true, DefaultEnabled: true,
					OutputDocType: "intake", OutputDocTitle: "用户初始需求收集表",
				}},
			}},
		},
	}
	return &stubVersionResolver{
		defs: map[string]*workflowdef.Definition{
			key: {ID: 10, Key: key, Name: workflowdef.OfficialWorkflowName(key), LatestPublishedVersion: 1},
		},
		versions: map[string]*workflowdef.Version{key: ver},
	}
}

func validPlan() WorkflowPlan {
	return WorkflowPlan{
		WorkflowDefinitionKey: workflowdef.OfficialKeyMain,
		WorkflowVersion:       1,
		Stages: []StagePlan{{
			StageKey: "V0.1_triage", Enabled: true,
			DocTasks: []DocTaskPlan{{
				TaskKey: "intake", Enabled: true,
				Duties: DocDuty{AuthorUserID: 1, ReviewerUserID: 2, ApproverUserID: 3},
			}},
		}},
	}
}

func TestService_PlanPreviewActivate(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 42, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, testResolver(), nil, nil)

	settings, err := svc.SaveWorkflowPlan(ctx, 42, 1, true, SavePlanInput{
		Plan: validPlan(), ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	if err != nil {
		t.Fatalf("SaveWorkflowPlan: %v", err)
	}
	if settings.Plan == nil || settings.Plan.WorkflowDefinitionKey != workflowdef.OfficialKeyMain {
		t.Fatalf("expected saved plan, got %+v", settings.Plan)
	}

	preview, err := svc.ActivationPreview(ctx, 42, 1, true)
	if err != nil {
		t.Fatalf("ActivationPreview: %v", err)
	}
	if preview.ConfirmationToken == "" || preview.PlanHash == "" {
		t.Fatal("expected confirmation token and plan hash")
	}

	result, err := svc.Activate(ctx, 42, 1, true, ActivateInput{
		ConfirmationToken:      preview.ConfirmationToken,
		ExpectedProjectVersion: preview.ExpectedProjectVersion,
		ExpectedPlanRevision:   preview.ExpectedPlanRevision,
	})
	if err != nil {
		t.Fatalf("Activate: %v", err)
	}
	if result.LifecycleStatus != LifecycleActive || result.ActiveWorkflowKey != workflowdef.OfficialKeyMain {
		t.Fatalf("unexpected activate result: %+v", result)
	}

	live, _ := store.HasLiveInstance(ctx, 42)
	if !live {
		t.Fatal("expected live instance after activation")
	}
}

func TestService_BlockPlanEditWhenActive(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 7, LifecycleActive, "main", 2, 1)
	svc := NewService(store, testResolver(), nil, nil)

	_, err := svc.SaveWorkflowPlan(ctx, 7, 1, true, SavePlanInput{
		Plan: validPlan(), ExpectedPlanRevision: 1,
	})
	if !errors.Is(err, ErrPlanFrozen) {
		t.Fatalf("expected ErrPlanFrozen, got %v", err)
	}
}

func TestService_SeparationOfDutyValidation(t *testing.T) {
	bad := validPlan()
	bad.Stages[0].DocTasks[0].Duties.ReviewerUserID = 1
	res := validatePlan(bad, testResolver().versions[workflowdef.OfficialKeyMain])
	if res.Valid {
		t.Fatal("expected separation of duty violation")
	}
}

func TestService_SavePlanReturnsValidationIssues(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 8, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, testResolver(), nil, nil)
	bad := validPlan()
	bad.Stages[0].DocTasks[0].Duties = DocDuty{}

	_, err := svc.SaveWorkflowPlan(ctx, 8, 1, true, SavePlanInput{
		Plan: bad, ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	var validationErr *ValidationError
	if !errors.As(err, &validationErr) {
		t.Fatalf("expected ValidationError, got %v", err)
	}
	if len(validationErr.Issues) != 3 {
		t.Fatalf("expected three missing-duty issues, got %+v", validationErr.Issues)
	}
}