package nodecli

import (
	"bytes"
	"context"
	"errors"
	"io"
	"net/http"
	"net/http/httptest"
	"os"
	"path/filepath"
	"strings"
	"testing"

	"evobgp/internal/bundle"
)

type countingBody struct {
	io.Reader
	read int
}

func (b *countingBody) Read(p []byte) (int, error) {
	n, e := b.Reader.Read(p)
	b.read += n
	return n, e
}
func (b *countingBody) Close() error { return nil }

func TestHTTPBundleBoundKnownAndChunked(t *testing.T) {
	for _, length := range []int64{-1, 2048} {
		body := &countingBody{Reader: bytes.NewReader(bytes.Repeat([]byte{'x'}, 2048))}
		_, err := readHTTPBytes(&http.Response{Body: body, ContentLength: length}, 1024)
		if !errors.Is(err, bundle.ErrLimit) {
			t.Fatalf("length=%d limit=%v", length, err)
		}
		if body.read > 1025 || (length > 1024 && body.read != 0) {
			t.Fatalf("unbounded read %d for length %d", body.read, length)
		}
	}
}

func TestLocalBundleSizeBound(t *testing.T) {
	path := filepath.Join(t.TempDir(), "bundle.tar.gz")
	if err := os.WriteFile(path, bytes.Repeat([]byte{'x'}, 2048), 0o600); err != nil {
		t.Fatal(err)
	}
	if _, err := readBundleFile(path, bundle.Limits{MaxCompressedBytes: 1024}); !errors.Is(err, bundle.ErrLimit) {
		t.Fatalf("local input cap: %v", err)
	}
}

func TestBundleHTTPMetadataAndDiagnosticsBound(t *testing.T) {
	server := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		switch {
		case strings.Contains(r.URL.Path, "/revisions/latest"):
			_, _ = io.WriteString(w, strings.Repeat(" ", 65<<10))
		default:
			w.WriteHeader(http.StatusBadRequest)
			_, _ = io.WriteString(w, strings.Repeat("x", 64<<10))
		}
	}))
	defer server.Close()
	if _, err := fetchLatestRevision(server.URL, "key", "speaker"); !errors.Is(err, bundle.ErrLimit) {
		t.Fatalf("metadata unbounded: %v", err)
	}
	if _, err := fetchBundle(server.URL, "key", "speaker", "revision"); err == nil || len(err.Error()) > 5<<10 {
		t.Fatalf("diagnostic unbounded: %v", err)
	}
}

func TestSyncFetchRespectsCallerCancellation(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	if _, err := fetchBundleContext(ctx, "http://127.0.0.1:1", "key", "speaker", "revision", bundle.Limits{}); !errors.Is(err, context.Canceled) {
		t.Fatalf("download ignored cancel: %v", err)
	}
	if _, err := fetchLatestRevisionContext(ctx, "http://127.0.0.1:1", "key", "speaker"); !errors.Is(err, context.Canceled) {
		t.Fatalf("metadata ignored cancel: %v", err)
	}
}