package tools

import (
	"encoding/json"
	"testing"

	core "git-ssh.u1680832.nyat.app/weichen/Agent-System-Core.git"
)

// ---- N3 WP3：backend 自家工具面的回滚资格钉住（验收② 产品侧）----

type checkpointNoteCtx struct {
	*fakeFSCtx
	noted []string
}

func (c *checkpointNoteCtx) NoteFileCheckpoint(rel string, before []byte, existed bool, after []byte) error {
	c.noted = append(c.noted, rel)
	return nil
}

// backend 工具面里只有 fs_write_file 写检查点（产品面不暴露编辑工具是刻意的
// 收窄）；fs_read_file / fs_list_dir 永不记录。
func TestBackendCheckpointEligibilityIsWriteFileOnly(t *testing.T) {
	r := newFSRegistry(t)
	ctx := &checkpointNoteCtx{fakeFSCtx: &fakeFSCtx{root: t.TempDir(), owner: "o1", conv: "c1", fsToolsOn: true}}
	exec := func(name, args string) {
		t.Helper()
		r.Execute(ctx, core.ToolCallRequest{CallID: "c-" + name, Name: name, Arguments: json.RawMessage(args)})
	}
	exec("fs_write_file", `{"path":"a.txt","content":"x"}`)
	if len(ctx.noted) != 1 || ctx.noted[0] != "a.txt" {
		t.Fatalf("fs_write_file 必须写检查点：%v", ctx.noted)
	}
	exec("fs_read_file", `{"path":"a.txt"}`)
	exec("fs_list_dir", `{"path":"."}`)
	if len(ctx.noted) != 1 {
		t.Fatalf("读类工具不得写检查点：%v", ctx.noted)
	}
}