package upstream

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

func TestPrepareCacheIsPinnedAndReusableOffline(t *testing.T) {
	s, err := LoadPinned(filepath.Join("..", ".."))
	if err != nil {
		t.Fatal(err)
	}
	root := t.TempDir()
	b, _ := json.Marshal(s.Lock)
	if err = os.WriteFile(filepath.Join(root, "gitea.lock.json"), b, 0644); err != nil {
		t.Fatal(err)
	}
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		prefix := "/" + s.Lock.Commit + "/"
		if !strings.HasPrefix(r.URL.Path, prefix) {
			t.Errorf("unpinned request %s", r.URL.Path)
			http.NotFound(w, r)
			return
		}
		data, ok := s.Files[strings.TrimPrefix(r.URL.Path, prefix)]
		if !ok {
			http.NotFound(w, r)
			return
		}
		w.Write(data)
	}))
	if _, err := prepareFrom(context.Background(), root, server.URL+"/"); err != nil {
		server.Close()
		t.Fatal(err)
	}
	server.Close()
	if _, err := prepareFrom(context.Background(), root, server.URL+"/"); err != nil {
		t.Fatalf("offline cache: %v", err)
	}
	path := filepath.Join(CacheDir(root), "templates", "mail", "base", "head.tmpl")
	if err = os.WriteFile(path, []byte("corrupt"), 0644); err != nil {
		t.Fatal(err)
	}
	if _, err := prepareFrom(context.Background(), root, server.URL+"/"); err == nil {
		t.Fatal("corrupt cache was accepted")
	}
}