package policy

import (
	"testing"

	"ai-operator/internal/dialogue/state"
	"ai-operator/internal/tools"
)

func TestToolPolicyAndGuardrail(t *testing.T) {
	cases := []struct {
		name    string
		session state.ConversationSession
		tool    string
		allowed bool
		reason  string
	}{
		{"search call started", state.ConversationSession{State: state.StateCallStarted}, tools.SearchKnowledgeBase, true, "ok"},
		{"search language selection", state.ConversationSession{State: state.StateLanguageSelection}, tools.SearchKnowledgeBase, true, "ok"},
		{"set language allowed", state.ConversationSession{State: state.StateLanguageSelection}, tools.SetLanguage, true, "ok"},
		{"search region selection", state.ConversationSession{State: state.StateRegionSelection, Language: state.LanguageRU}, tools.SearchKnowledgeBase, true, "ok"},
		{"set region allowed", state.ConversationSession{State: state.StateRegionSelection, Language: state.LanguageRU}, tools.SetRegion, true, "ok"},
		{"search ready", state.ConversationSession{State: state.StateReadyToHelp, Language: state.LanguageRU, Region: state.RegionSelection{Code: "global", Status: state.RegionSelected}}, tools.SearchKnowledgeBase, true, "ok"},
		{"search ended", state.ConversationSession{State: state.StateEnded, Language: state.LanguageRU, Region: state.RegionSelection{Code: "global", Status: state.RegionSelected}}, tools.SearchKnowledgeBase, false, "call_ended"},
		{"unknown", state.ConversationSession{State: state.StateReadyToHelp}, "bad_tool", false, "unknown_tool"},
		{"handoff non-ended", state.ConversationSession{State: state.StateRegionSelection}, tools.RequestHumanHandoff, true, "ok"},
	}
	for _, tc := range cases {
		t.Run(tc.name, func(t *testing.T) {
			got := AuthorizeTool(tc.session, tc.tool)
			if got.Allowed != tc.allowed || got.ReasonCode != tc.reason {
				t.Fatalf("decision=%+v", got)
			}
		})
	}
}

func TestHardGuardrail(t *testing.T) {
	base := state.ConversationSession{State: state.StateReadyToHelp}
	if !AuthorizeTool(base, tools.SearchKnowledgeBase).Allowed {
		t.Fatal("search denied without explicit language")
	}
	base.Language = state.LanguageRU
	if !AuthorizeTool(base, tools.SearchKnowledgeBase).Allowed {
		t.Fatal("search denied without region")
	}
	base.Region = state.RegionSelection{Code: "almaty_city", Status: state.RegionSelected}
	if !AuthorizeTool(base, tools.SearchKnowledgeBase).Allowed {
		t.Fatal("search denied after language and region")
	}
	base.State = state.StateQuestionAnswering
	if !AuthorizeTool(base, tools.SearchKnowledgeBase).Allowed {
		t.Fatal("search denied in question answering")
	}
}