package assets

import (
	"os"
	"path/filepath"
	"testing"
)

func TestWalk(t *testing.T) {
	root := t.TempDir()
	must := func(rel string) {
		p := filepath.Join(root, rel)
		if err := os.MkdirAll(filepath.Dir(p), 0o755); err != nil {
			t.Fatal(err)
		}
		if err := os.WriteFile(p, []byte("x"), 0o644); err != nil {
			t.Fatal(err)
		}
	}
	must("a.MDL")
	must("sub/b.mdl")
	must("sub/c.txt")

	exts := map[string]bool{".mdl": true}
	got, err := walk([]string{root}, exts, true)
	if err != nil {
		t.Fatal(err)
	}
	if len(got) != 2 {
		t.Fatalf("recursive walk = %v, want 2 mdl files", got)
	}

	got, _ = walk([]string{root}, exts, false)
	if len(got) != 1 || filepath.Base(got[0]) != "a.MDL" {
		t.Fatalf("non-recursive walk = %v, want only a.MDL", got)
	}

	// A file argument that matches is included directly.
	got, _ = walk([]string{filepath.Join(root, "sub", "b.mdl")}, exts, true)
	if len(got) != 1 {
		t.Fatalf("file arg walk = %v, want the file itself", got)
	}
}

func TestLook(t *testing.T) {
	dir := t.TempDir()
	stub := filepath.Join(dir, "mytool")
	if err := os.WriteFile(stub, []byte("#!/bin/sh\n"), 0o755); err != nil {
		t.Fatal(err)
	}
	t.Setenv("PATH", dir)

	if got := look("nope-not-here", "mytool"); got == "" {
		t.Fatal("look should find mytool on PATH")
	}
	// Explicit existing path candidate.
	if got := look(stub); got != stub {
		t.Fatalf("look(%q) = %q, want the path itself", stub, got)
	}
	if got := look("definitely-absent-binary-xyz"); got != "" {
		t.Fatalf("look = %q, want empty", got)
	}
}