package projectinstance

import (
	"context"
	"errors"
	"testing"

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

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{AuthorUserID: 1}

	_, 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) != 1 || validationErr.Issues[0].Code != issueDutyPartialAssignment {
		t.Fatalf("expected DUTY_PARTIAL_ASSIGNMENT, got %+v", validationErr.Issues)
	}
}

type mapMemberLookup struct {
	ids map[int64]struct{}
}

func (m *mapMemberLookup) ActiveMemberIDs(_ context.Context, _ int64) (map[int64]struct{}, error) {
	out := make(map[int64]struct{}, len(m.ids))
	for id := range m.ids {
		out[id] = struct{}{}
	}
	return out, nil
}

func (m *mapMemberLookup) remove(id int64) {
	delete(m.ids, id)
}

func TestService_OptionalNoneSaveAndZeroFullActivate(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 81, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, optionalDutyResolver(), nil, nil)

	plan := optionalDutyPlan(DocDuty{}, DocDuty{})
	settings, err := svc.SaveWorkflowPlan(ctx, 81, 1, true, SavePlanInput{
		Plan: plan, ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	if err != nil {
		t.Fatalf("zero full should save: %v", err)
	}
	if settings.Plan == nil || countFullDutyDocs(*settings.Plan) != 0 {
		t.Fatalf("saved plan should stay ungoverned, got %+v", settings.Plan)
	}
	_, err = svc.ActivationPreview(ctx, 81, 1, true)
	var previewErr *ValidationError
	if !errors.As(err, &previewErr) || !hasIssue(previewErr.Issues, issueNoGovernedDocument) {
		t.Fatalf("preview must reject zero governance, got %v", err)
	}
}

func TestService_RequiredEmptyDutiesRejected(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 82, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, requiredDutyResolver(), nil, nil)
	plan := validPlan()
	plan.Stages[0].DocTasks[0].Duties = DocDuty{}
	_, err := svc.SaveWorkflowPlan(ctx, 82, 1, true, SavePlanInput{
		Plan: plan, ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	var validationErr *ValidationError
	if !errors.As(err, &validationErr) || !hasIssue(validationErr.Issues, issueDutyAssignmentRequired) {
		t.Fatalf("required empty duties: %v", err)
	}
}

func TestService_InactiveMemberRejected(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 83, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, testResolver(), nil, nil)
	svc.SetActiveMemberLookup(&mapMemberLookup{ids: map[int64]struct{}{1: {}, 2: {}}})
	_, err := svc.SaveWorkflowPlan(ctx, 83, 1, true, SavePlanInput{
		Plan: validPlan(), ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	var validationErr *ValidationError
	if !errors.As(err, &validationErr) || !hasIssue(validationErr.Issues, issueDutyAssigneeNotActive) {
		t.Fatalf("inactive member: %v", err)
	}
}

func TestService_ActivateRechecksMembersAfterPreview(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 84, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, testResolver(), nil, nil)
	lookup := &mapMemberLookup{ids: map[int64]struct{}{1: {}, 2: {}, 3: {}}}
	svc.SetActiveMemberLookup(lookup)

	if _, err := svc.SaveWorkflowPlan(ctx, 84, 1, true, SavePlanInput{
		Plan: validPlan(), ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	}); err != nil {
		t.Fatalf("SaveWorkflowPlan: %v", err)
	}
	preview, err := svc.ActivationPreview(ctx, 84, 1, true)
	if err != nil {
		t.Fatalf("ActivationPreview: %v", err)
	}
	lookup.remove(3)
	_, err = svc.Activate(ctx, 84, 1, true, ActivateInput{
		ConfirmationToken:      preview.ConfirmationToken,
		ExpectedProjectVersion: preview.ExpectedProjectVersion,
		ExpectedPlanRevision:   preview.ExpectedPlanRevision,
	})
	var validationErr *ValidationError
	if !errors.As(err, &validationErr) || !hasIssue(validationErr.Issues, issueDutyAssigneeNotActive) {
		t.Fatalf("activate after member left: %v", err)
	}
	_, reuseErr := svc.Activate(ctx, 84, 1, true, ActivateInput{
		ConfirmationToken:      preview.ConfirmationToken,
		ExpectedProjectVersion: preview.ExpectedProjectVersion,
		ExpectedPlanRevision:   preview.ExpectedPlanRevision,
	})
	if reuseErr == nil {
		t.Fatal("stale token must not skip the failed membership recheck")
	}
}

func TestService_FullPlusNoneActivateAndNormalize(t *testing.T) {
	ctx := context.Background()
	store := newMemStore()
	_ = SeedProjectMeta(store, 85, LifecyclePlanning, "", 1, 0)
	svc := NewService(store, optionalDutyResolver(), nil, nil)
	svc.SetActiveMemberLookup(&mapMemberLookup{ids: map[int64]struct{}{1: {}, 2: {}, 3: {}}})

	disabled := optionalDutyPlan(
		DocDuty{AuthorUserID: 1, ReviewerUserID: 2, ApproverUserID: 3},
		DocDuty{AuthorUserID: 9, ReviewerUserID: 8, ApproverUserID: 7},
	)
	disabled.Stages[0].DocTasks[1].Enabled = false

	saved, err := svc.SaveWorkflowPlan(ctx, 85, 1, true, SavePlanInput{
		Plan: disabled, ExpectedPlanRevision: 0, ExpectedSelectionVersion: 1,
	})
	if err != nil {
		t.Fatalf("save disabled leftover: %v", err)
	}
	if saved.Plan.Stages[0].DocTasks[1].Duties != (DocDuty{}) {
		t.Fatalf("disabled snapshot must drop old IDs, got %+v", saved.Plan.Stages[0].DocTasks[1].Duties)
	}

	fullNone := optionalDutyPlan(
		DocDuty{AuthorUserID: 1, ReviewerUserID: 2, ApproverUserID: 3},
		DocDuty{},
	)
	saved, err = svc.SaveWorkflowPlan(ctx, 85, 1, true, SavePlanInput{
		Plan: fullNone, ExpectedPlanRevision: saved.WorkflowPlanRevision, ExpectedSelectionVersion: 1,
	})
	if err != nil {
		t.Fatalf("save full+none: %v", err)
	}
	preview, err := svc.ActivationPreview(ctx, 85, 1, true)
	if err != nil {
		t.Fatalf("ActivationPreview: %v", err)
	}
	if _, err := svc.Activate(ctx, 85, 1, true, ActivateInput{
		ConfirmationToken:      preview.ConfirmationToken,
		ExpectedProjectVersion: preview.ExpectedProjectVersion,
		ExpectedPlanRevision:   preview.ExpectedPlanRevision,
	}); err != nil {
		t.Fatalf("activate full+none: %v", err)
	}
}

func hasIssue(issues []workflowdef.ValidationIssue, code string) bool {
	for _, issue := range issues {
		if issue.Code == code {
			return true
		}
	}
	return false
}