package wire

import (
	"os/exec"
	"strings"
	"testing"
)

// The protocol is shared by two layers that may not import each other, and it
// can only be shared because it reaches for nothing itself: no domain, no
// configuration, no path resolution, no third party. One import from any of
// those would drag every user of this package into that layer — which is the
// whole reason these shapes were lifted out of the transport rather than left
// there for the bridge to reimplement.
//
// The dependency walk, so a helper pulled in three packages deep is caught as
// the same violation as one written at the top of a file.
func TestWireDependsOnNothing(t *testing.T) {
	out, err := exec.Command("go", "list", "-deps", ".").Output()
	if err != nil {
		t.Fatalf("go list: %v", err)
	}
	for _, dep := range strings.Fields(string(out)) {
		if dep == "git.noodles.cam/claude-skills/marketplace/cli/internal/wire" {
			continue
		}
		// A standard-library import path has no dot in its first element,
		// because it has no domain name in front of it.
		first, _, _ := strings.Cut(dep, "/")
		if strings.Contains(first, ".") {
			t.Errorf("the protocol imports %s — these are shapes and identifiers, and nothing else belongs here", dep)
		}
	}
}

// The other half: net/http and os are standard library, so "no third-party
// imports" would not catch a transport or a file read written by hand here.
// Name them.
//
// DIRECT imports, not the dependency walk — fmt reaches os on its own, and the
// question this asks is what THIS package reaches for.
func TestWireReachesNeitherTheNetworkNorTheDisk(t *testing.T) {
	forbidden := map[string]string{
		"net/http": "an HTTP call belongs in the transport",
		"net":      "an HTTP call belongs in the transport",
		"os":       "a shape reads no file and no environment",
		"os/exec":  "nothing here shells out",
		"io":       "nothing here is a stream",
		"time":     "a timestamp crosses as the string the tracker sent",
	}

	out, err := exec.Command("go", "list", "-f", `{{join .Imports "\n"}}`, ".").Output()
	if err != nil {
		t.Fatalf("go list: %v", err)
	}
	for _, dep := range strings.Fields(string(out)) {
		if why, bad := forbidden[dep]; bad {
			t.Errorf("wire imports %s — %s", dep, why)
		}
	}
}