package mirror

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

// This package repairs a filesystem layout and knows nothing else. It has no
// business with an issue, a tracker, a login or a configuration file, and the
// moment it imports one of them it stops being a thing that can be run over any
// directory on the machine.
//
// 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 TestMirrorDependsOnNothing(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/mirror" {
			continue
		}
		// A standard-library import path has no dot in its first element,
		// because it has no domain name in front of it.
		if first, _, _ := strings.Cut(dep, "/"); strings.Contains(first, ".") {
			t.Errorf("mirror imports %s — this walks a directory, and nothing else belongs here", dep)
		}
	}
}

// The other half: os and net/http are standard library, so "no third-party
// imports" would not catch a request or a shell-out written by hand here. os
// itself is the point of this package, so it is the one that is allowed.
//
// DIRECT imports, not the dependency walk — fmt reaches os on its own, and the
// question this asks is what THIS package reaches for.
func TestMirrorNeitherDialsNorShellsOut(t *testing.T) {
	forbidden := map[string]string{
		"net/http":      "a documentation convention is not fetched from anywhere",
		"net":           "a documentation convention is not fetched from anywhere",
		"os/exec":       "the repair is syscalls, not a shell — that is the whole reason it left bash",
		"encoding/json": "the hook's JSON is the command layer's business, not this one's",
		"time":          "nothing here has a clock in it",
	}

	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("mirror imports %s — %s", dep, why)
		}
	}
}