package scaffold

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

// This package is prose and a table of contents. It hands out embedded bytes and
// says which of them carry a generated region; it renders nothing, resolves
// nothing and reads no file off the disk.
//
// That matters because of what sits above it: internal/cmd imports this to write
// a project's `.claude/` tree, and if this package imported the registry back the
// two would be a cycle. 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 TestScaffoldDependsOnNothing(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/scaffold" {
			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("scaffold imports %s — these are embedded documents, 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 read off the disk written by hand here. The whole
// premise is that these documents travel INSIDE the binary — one os.ReadFile and
// they are back to being files on a machine that may not have them.
//
// DIRECT imports, not the dependency walk — embed reaches io/fs on its own, and
// the question this asks is what THIS package reaches for.
func TestScaffoldReadsNothingOffTheDisk(t *testing.T) {
	forbidden := map[string]string{
		"os":       "these documents are embedded; a file read here is a file that can be missing",
		"os/exec":  "nothing here shells out",
		"net/http": "nothing here is fetched",
		"net":      "nothing here is fetched",
		"time":     "a document has no 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("scaffold imports %s — %s", dep, why)
		}
	}
}