package engine

import (
	"testing"

	"github.com/Grace-Solutions/OrchestrAD/internal/models"
	ldapv3 "github.com/go-ldap/ldap/v3"
)

func strPtr(s string) *string { return &s }

func TestResolveBaseDN(t *testing.T) {
	conn := &models.ADConnection{RootDN: "DC=example,DC=com"}

	if got := resolveBaseDN(&models.Rule{}, conn); got != "DC=example,DC=com" {
		t.Errorf("expected connection RootDN fallback, got %q", got)
	}

	override := "OU=Staff,DC=example,DC=com"
	rule := &models.Rule{BaseDNOverride: &override}
	if got := resolveBaseDN(rule, conn); got != override {
		t.Errorf("expected rule override, got %q", got)
	}

	empty := ""
	rule = &models.Rule{BaseDNOverride: &empty}
	if got := resolveBaseDN(rule, conn); got != "DC=example,DC=com" {
		t.Errorf("empty override should fall back to connection, got %q", got)
	}

	if got := resolveBaseDN(&models.Rule{}, nil); got != "" {
		t.Errorf("nil connection should yield empty string, got %q", got)
	}
}

func TestResolveScope(t *testing.T) {
	conn := &models.ADConnection{DefaultSearchScope: "OneLevel"}

	if got := resolveScope(&models.Rule{}, conn); got != ldapv3.ScopeSingleLevel {
		t.Errorf("expected OneLevel from connection, got %d", got)
	}

	rule := &models.Rule{SearchScopeOverride: strPtr("Base")}
	if got := resolveScope(rule, conn); got != ldapv3.ScopeBaseObject {
		t.Errorf("expected Base from override, got %d", got)
	}

	rule = &models.Rule{SearchScopeOverride: strPtr("Subtree")}
	if got := resolveScope(rule, conn); got != ldapv3.ScopeWholeSubtree {
		t.Errorf("Subtree override should produce WholeSubtree, got %d", got)
	}

	if got := resolveScope(&models.Rule{}, nil); got != ldapv3.ScopeWholeSubtree {
		t.Errorf("empty inputs should default to WholeSubtree, got %d", got)
	}
}

func TestCollectAttributes_IncludesDefaultsAndConditionNames(t *testing.T) {
	rule := &models.Rule{
		ConditionGroups: []models.RuleConditionGroup{
			{
				Conditions: []models.RuleCondition{
					{AttributeName: "department"},
					{AttributeName: "title"},
					{AttributeName: ""},
				},
			},
		},
	}
	attrs := collectAttributes(rule)

	needs := []string{"dn", "cn", "objectClass", "sAMAccountName", "member", "memberOf", "department", "title"}
	for _, want := range needs {
		if !contains(attrs, want) {
			t.Errorf("expected attributes to contain %q, got %v", want, attrs)
		}
	}
	if contains(attrs, "") {
		t.Errorf("empty attribute name should not be collected, got %v", attrs)
	}
}

func TestBuildConditionGroups_FiltersDisabled(t *testing.T) {
	val := "Sales"
	custom := "(memberOf=CN=VIP,DC=x)"
	rule := &models.Rule{
		ConditionGroups: []models.RuleConditionGroup{
			{
				IsEnabled:    true,
				JoinOperator: "AND",
				Negate:       true,
				Conditions: []models.RuleCondition{
					{IsEnabled: true, AttributeName: "department", Operator: "Equals", ComparisonValue: &val},
					{IsEnabled: false, AttributeName: "title", Operator: "Equals"},
					{IsEnabled: true, Operator: "Custom", CustomLdapExpression: &custom},
				},
			},
			{IsEnabled: false, Conditions: []models.RuleCondition{{IsEnabled: true, AttributeName: "x"}}},
		},
	}

	groups := buildConditionGroups(rule)
	if len(groups) != 1 {
		t.Fatalf("expected 1 enabled group, got %d", len(groups))
	}
	g := groups[0]
	if !g.Negate || string(g.JoinOperator) != "AND" {
		t.Errorf("unexpected group flags: negate=%v op=%q", g.Negate, g.JoinOperator)
	}
	if len(g.Conditions) != 2 {
		t.Fatalf("expected 2 enabled conditions, got %d", len(g.Conditions))
	}
	if g.Conditions[0].Attribute != "department" || g.Conditions[0].Value != "Sales" {
		t.Errorf("first condition mismatch: %+v", g.Conditions[0])
	}
	if g.Conditions[1].CustomLdap != custom {
		t.Errorf("expected custom expression preserved, got %q", g.Conditions[1].CustomLdap)
	}
}

func TestParentDN(t *testing.T) {
	cases := map[string]string{
		"CN=Alice,OU=Staff,DC=example,DC=com":  "OU=Staff,DC=example,DC=com",
		"CN=Alice, OU=Staff,DC=example,DC=com": "OU=Staff,DC=example,DC=com",
		"DC=com":                               "",
		"":                                     "",
	}
	for input, want := range cases {
		if got := parentDN(input); got != want {
			t.Errorf("parentDN(%q) = %q, want %q", input, got, want)
		}
	}
}

func contains(s []string, v string) bool {
	for _, x := range s {
		if x == v {
			return true
		}
	}
	return false
}