package platform

import (
	"context"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"testing"
)

func TestDownloadHappyPath(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("payload"))
	}))
	defer srv.Close()
	dir := t.TempDir()
	dest := filepath.Join(dir, "out.bin")
	if err := Download(context.Background(), srv.URL, dest, 0o755); err != nil {
		t.Fatal(err)
	}
	got, _ := os.ReadFile(dest)
	if string(got) != "payload" {
		t.Fatalf("got %q want payload", got)
	}
	info, _ := os.Stat(dest)
	if info.Mode().Perm() != 0o755 {
		t.Fatalf("mode=%v want 0755", info.Mode().Perm())
	}
}

func TestDownload404Errors(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		http.Error(w, "nope", http.StatusNotFound)
	}))
	defer srv.Close()
	dir := t.TempDir()
	dest := filepath.Join(dir, "out.bin")
	if err := Download(context.Background(), srv.URL, dest, 0o644); err == nil {
		t.Fatal("want error on 404")
	}
	if _, err := os.Stat(dest); !os.IsNotExist(err) {
		t.Fatal("dest should not exist after failed download")
	}
}