package filewebdav_test

import (
	"io"
	"log/slog"
	"net/http"
	"net/http/httptest"
	"os"
	"strings"
	"testing"

	"github.com/yourusername/caldav-server/internal/auth"
	filewebdav "github.com/yourusername/caldav-server/internal/webdav"
)

func testLogger() *slog.Logger {
	return slog.New(slog.NewTextHandler(io.Discard, nil))
}

func doAs(t *testing.T, h http.Handler, user, method, path string, body string) *httptest.ResponseRecorder {
	t.Helper()
	req := httptest.NewRequest(method, path, strings.NewReader(body))
	ctx := auth.NewContext(req.Context(), &auth.Principal{Username: user})
	req = req.WithContext(ctx)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)
	return rec
}

// TestPerUserIsolationAndPrefix verifies that all users share the same
// "/files/" URL, but each is served from (and can only see) their own
// directory on disk, resolved from the Basic Auth identity.
func TestPerUserIsolationAndPrefix(t *testing.T) {
	dir := t.TempDir()
	h := filewebdav.NewHandler(nil, dir, testLogger())

	putRec := doAs(t, h, "alice", http.MethodPut, "/files/note.txt", "hello alice")
	if putRec.Code != http.StatusCreated && putRec.Code != http.StatusNoContent {
		t.Fatalf("PUT as alice: unexpected status %d: %s", putRec.Code, putRec.Body.String())
	}

	getRec := doAs(t, h, "alice", http.MethodGet, "/files/note.txt", "")
	if getRec.Code != http.StatusOK {
		t.Fatalf("GET as alice: unexpected status %d", getRec.Code)
	}
	if getRec.Body.String() != "hello alice" {
		t.Fatalf("unexpected body: %q", getRec.Body.String())
	}

	// bob hits the exact same URL, but must not see alice's file — his own
	// directory on disk is empty.
	bobRec := doAs(t, h, "bob", http.MethodGet, "/files/note.txt", "")
	if bobRec.Code != http.StatusNotFound {
		t.Fatalf("expected bob to get 404 for alice's file, got %d", bobRec.Code)
	}

	// Confirm the file physically landed under dataDir/alice/files/, matching
	// the new nested structure.
	if _, err := os.Stat(dir + "/alice/files/note.txt"); err != nil {
		t.Fatalf("expected file at dataDir/alice/files/note.txt: %v", err)
	}
}

// TestLockPersistsAcrossRequests ensures the LockSystem used by the handler
// is not recreated (and thus reset) on every request.
func TestLockPersistsAcrossRequests(t *testing.T) {
	dir := t.TempDir()
	h := filewebdav.NewHandler(nil, dir, testLogger())

	// Create the file first.
	doAs(t, h, "alice", http.MethodPut, "/files/locked.txt", "v1")

	lockBody := `<?xml version="1.0" encoding="utf-8" ?>
<D:lockinfo xmlns:D="DAV:">
  <D:lockscope><D:exclusive/></D:lockscope>
  <D:locktype><D:write/></D:locktype>
  <D:owner><D:href>test</D:href></D:owner>
</D:lockinfo>`

	lockRec := doAs(t, h, "alice", "LOCK", "/files/locked.txt", lockBody)
	if lockRec.Code != http.StatusOK {
		t.Fatalf("LOCK: unexpected status %d: %s", lockRec.Code, lockRec.Body.String())
	}
	locktoken := lockRec.Header().Get("Lock-Token")
	if locktoken == "" {
		t.Fatal("expected Lock-Token header in LOCK response")
	}

	// A second, unrelated request must still see the lock as active,
	// proving the LockSystem instance was reused rather than reset.
	req := httptest.NewRequest(http.MethodPut, "/files/locked.txt", strings.NewReader("v2 without token"))
	ctx := auth.NewContext(req.Context(), &auth.Principal{Username: "alice"})
	req = req.WithContext(ctx)
	rec := httptest.NewRecorder()
	h.ServeHTTP(rec, req)

	if rec.Code != http.StatusLocked {
		t.Fatalf("expected 423 Locked for PUT without lock token, got %d: %s", rec.Code, rec.Body.String())
	}
}