package tool

import (
	"context"
	"strings"
	"testing"

	llm "gitea.stevedudenhoeffer.com/steve/majordomo/llm"
)

// fakeTool is a minimal Tool used to exercise the registry's gating.
type fakeTool struct {
	name        string
	desc        string
	perm        Permission
	calledWith  *Invocation
	returnText  string
	returnError error
}

func (f *fakeTool) Name() string           { return f.name }
func (f *fakeTool) Description() string    { return f.desc }
func (f *fakeTool) Permission() Permission { return f.perm }
func (f *fakeTool) BuildLLM(inv Invocation) llm.Tool {
	type emptyParams struct{}
	return llm.DefineTool(
		f.name,
		f.desc,
		func(ctx context.Context, _ emptyParams) (any, error) {
			if err := CheckGate(inv); err != nil {
				EmitAudit(inv, "{}", "", err)
				return "", err
			}
			f.calledWith = &inv
			EmitAudit(inv, "{}", f.returnText, f.returnError)
			return f.returnText, f.returnError
		},
	)
}

func TestRegister_DuplicateRejected(t *testing.T) {
	r := NewRegistry()
	a := &fakeTool{name: "x", perm: Permission{AuthoringRequirement: RequirementAnyone, SafeForShare: true}}
	b := &fakeTool{name: "x", perm: Permission{AuthoringRequirement: RequirementAnyone, SafeForShare: true}}
	if err := r.Register(a); err != nil {
		t.Fatal(err)
	}
	err := r.Register(b)
	if err == nil || !strings.Contains(err.Error(), "duplicate") {
		t.Fatalf("expected duplicate-name error, got %v", err)
	}
}

func TestRegister_RejectsEmpty(t *testing.T) {
	r := NewRegistry()
	if err := r.Register(&fakeTool{name: ""}); err == nil {
		t.Fatal("expected empty-name rejection")
	}
	if err := r.Register(nil); err == nil {
		t.Fatal("expected nil-tool rejection")
	}
}

func TestBuild_UnknownTool(t *testing.T) {
	r := NewRegistry()
	_, err := r.Build([]string{"nope"}, Invocation{}, VisibilityPrivate, nil)
	if err == nil || !strings.Contains(err.Error(), "unknown tool") {
		t.Fatalf("expected unknown-tool error, got %v", err)
	}
}

func TestBuild_SharedRejectsUnsafeTool(t *testing.T) {
	r := NewRegistry()
	_ = r.Register(&fakeTool{name: "balance", perm: Permission{SafeForShare: false}})
	_, err := r.Build([]string{"balance"}, Invocation{}, VisibilityShared, nil)
	if err == nil || !strings.Contains(err.Error(), "not safe for share") {
		t.Fatalf("expected share-safety error, got %v", err)
	}
}

// TestBuild_TrustedBuiltinBypassesShareSafety verifies the
// trusted-flag escape hatch: a builtin (skill-wizard, mortventure)
// legitimately ships with public visibility AND not-safe-for-share
// tools. Build with trusted=true must not reject those.
//
// Why: pre-fix, invocation of skill-wizard (visibility=public, tools
// include wizard_* with SafeForShare=false) was rejected at runtime
// even though the loader had already bypassed save-time gates. The
// trusted flag aligns the invocation-time gate with the loader's
// trust model.
func TestBuild_TrustedBuiltinBypassesShareSafety(t *testing.T) {
	r := NewRegistry()
	_ = r.Register(&fakeTool{
		name:       "wizard_list",
		perm:       Permission{SafeForShare: false},
		returnText: "ok",
	})
	box, err := r.Build([]string{"wizard_list"}, Invocation{SkillName: "skill-wizard"}, VisibilityPublic, nil, true)
	if err != nil {
		t.Fatalf("trusted=true should bypass share-safety, got %v", err)
	}
	if box == nil {
		t.Fatal("trusted=true should produce a toolbox, got nil")
	}
}

// TestBuild_NonTrustedSharedStillRejects confirms the bypass is
// strictly opt-in: a non-builtin caller with the same shape (public
// visibility + unsafe tool) still hits the rejection path.
func TestBuild_NonTrustedSharedStillRejects(t *testing.T) {
	r := NewRegistry()
	_ = r.Register(&fakeTool{name: "balance", perm: Permission{SafeForShare: false}})
	_, err := r.Build([]string{"balance"}, Invocation{}, VisibilityPublic, nil, false)
	if err == nil || !strings.Contains(err.Error(), "not safe for share") {
		t.Fatalf("trusted=false (non-builtin) must still reject unsafe tool at public visibility, got %v", err)
	}
	// Omitted variadic = trusted defaults to false → same rejection.
	_, err = r.Build([]string{"balance"}, Invocation{}, VisibilityPublic, nil)
	if err == nil || !strings.Contains(err.Error(), "not safe for share") {
		t.Fatalf("omitted variadic must default to trusted=false, got %v", err)
	}
}

func TestBuild_PublicAcceptsSafeTool(t *testing.T) {
	r := NewRegistry()
	_ = r.Register(&fakeTool{name: "search", perm: Permission{SafeForShare: true}, returnText: "hits"})
	box, err := r.Build([]string{"search"}, Invocation{SkillName: "echo"}, VisibilityPublic, nil)
	if err != nil {
		t.Fatal(err)
	}
	out, err := execBox(box, toolCall{Name: "search", Arguments: "{}"})
	if err != nil || out != "hits" {
		t.Fatalf("unexpected: %q %v", out, err)
	}
}

func TestBuild_GateBlocksMismatchedSkill(t *testing.T) {
	r := NewRegistry()
	tt := &fakeTool{
		name:       "wizard_save",
		perm:       Permission{SafeForShare: true, SkillNameGate: "skill-wizard"},
		returnText: "saved",
	}
	_ = r.Register(tt)
	box, err := r.Build([]string{"wizard_save"}, Invocation{SkillName: "echo"}, VisibilityPrivate, nil)
	if err != nil {
		t.Fatalf("build: %v", err)
	}
	out, err := execBox(box, toolCall{Name: "wizard_save", Arguments: "{}"})
	if err == nil || !strings.Contains(err.Error(), "restricted to") {
		t.Fatalf("expected gate rejection, got out=%q err=%v", out, err)
	}
}

func TestBuild_GateAllowsMatchingSkill(t *testing.T) {
	r := NewRegistry()
	tt := &fakeTool{
		name:       "wizard_save",
		perm:       Permission{SafeForShare: true, SkillNameGate: "skill-wizard"},
		returnText: "saved",
	}
	_ = r.Register(tt)
	box, _ := r.Build([]string{"wizard_save"}, Invocation{SkillName: "skill-wizard"}, VisibilityPrivate, nil)
	out, err := execBox(box, toolCall{Name: "wizard_save", Arguments: "{}"})
	if err != nil || out != "saved" {
		t.Fatalf("unexpected: %q %v", out, err)
	}
}

func TestBuild_EmitsAudit(t *testing.T) {
	r := NewRegistry()
	tt := &fakeTool{name: "search", perm: Permission{SafeForShare: true}, returnText: "hits"}
	_ = r.Register(tt)

	var calls []AuditCall
	hook := func(c AuditCall) { calls = append(calls, c) }

	box, _ := r.Build([]string{"search"}, Invocation{SkillName: "echo"}, VisibilityPrivate, hook)
	_, _ = execBox(box, toolCall{Name: "search", Arguments: "{}"})

	if len(calls) != 1 || calls[0].Tool != "search" || calls[0].Result != "hits" || calls[0].Err != nil {
		t.Fatalf("unexpected audit: %+v", calls)
	}
}