package server

import (
	"testing"
	"time"

	"sneak.berlin/go/pixa/internal/config"
)

// TestNewHTTPServerTimeouts verifies that the constructed http.Server
// carries every hardening timeout wired onto it, including the slowloris
// defense (ReadHeaderTimeout) and the keep-alive bound (IdleTimeout). This
// guards against a field being defined but never set on the server, so
// each assertion compares the server field to its constant.
func TestNewHTTPServerTimeouts(t *testing.T) {
	t.Parallel()

	s := &Server{config: &config.Config{Port: 8080}}

	srv := s.newHTTPServer()

	fields := []struct {
		name string
		got  time.Duration
		want time.Duration
	}{
		{"ReadTimeout", srv.ReadTimeout, HTTPReadTimeout},
		{"ReadHeaderTimeout", srv.ReadHeaderTimeout, HTTPReadHeaderTimeout},
		{"WriteTimeout", srv.WriteTimeout, HTTPWriteTimeout},
		{"IdleTimeout", srv.IdleTimeout, HTTPIdleTimeout},
	}

	for _, f := range fields {
		if f.got != f.want {
			t.Errorf("%s = %v, want %v", f.name, f.got, f.want)
		}
	}

	if srv.MaxHeaderBytes != HTTPMaxHeaderBytes {
		t.Errorf("MaxHeaderBytes = %d, want %d",
			srv.MaxHeaderBytes, HTTPMaxHeaderBytes)
	}

	if srv.Handler != s {
		t.Error("Handler is not the server")
	}
}

// TestHardeningTimeoutValues pins the intent behind the two new timeouts
// without hard-coding brittle exact durations: the header-read phase is
// bounded strictly shorter than the whole-request read (the slowloris
// dribble), and idle keep-alive connections are bounded rather than held
// open forever.
func TestHardeningTimeoutValues(t *testing.T) {
	t.Parallel()

	if HTTPReadHeaderTimeout <= 0 || HTTPReadHeaderTimeout > HTTPReadTimeout {
		t.Errorf("ReadHeaderTimeout = %v, want positive and <= ReadTimeout %v",
			HTTPReadHeaderTimeout, HTTPReadTimeout)
	}

	if HTTPIdleTimeout <= 0 {
		t.Errorf("IdleTimeout = %v, want positive bound", HTTPIdleTimeout)
	}
}