package platform

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

func TestWriteUserFileCreatesParent(t *testing.T) {
	dir := t.TempDir()
	dest := filepath.Join(dir, "a", "b", "c.txt")
	if err := WriteUserFile(dest, []byte("hi"), 0o644); err != nil {
		t.Fatal(err)
	}
	got, _ := os.ReadFile(dest)
	if string(got) != "hi" {
		t.Fatalf("content %q", got)
	}
	info, _ := os.Stat(dest)
	if info.Mode().Perm() != 0o644 {
		t.Fatalf("mode %v", info.Mode().Perm())
	}
}

func TestWriteUserFileOverwritesAtomically(t *testing.T) {
	dir := t.TempDir()
	dest := filepath.Join(dir, "x")
	if err := WriteUserFile(dest, []byte("one"), 0o644); err != nil {
		t.Fatal(err)
	}
	if err := WriteUserFile(dest, []byte("two"), 0o644); err != nil {
		t.Fatal(err)
	}
	got, _ := os.ReadFile(dest)
	if string(got) != "two" {
		t.Fatalf("got %q want two", got)
	}
	// No .tmp sibling should be left behind.
	if _, err := os.Stat(dest + ".tmp"); !os.IsNotExist(err) {
		t.Fatalf(".tmp left behind: %v", err)
	}
}

func TestWriteUserFileExecMode(t *testing.T) {
	dir := t.TempDir()
	dest := filepath.Join(dir, "bin")
	if err := WriteUserFile(dest, []byte("#!/bin/sh\n"), 0o755); err != nil {
		t.Fatal(err)
	}
	info, _ := os.Stat(dest)
	if info.Mode().Perm() != 0o755 {
		t.Fatalf("mode %v want 0755", info.Mode().Perm())
	}
}