package htpack

import (
	"bytes"
	"io"
	"net/http/httptest"
	"os"
	"testing"

	"github.com/google/go-cmp/cmp"
	"src.lwithers.me.uk/go/htpack/packed"
)

func TestHandler(t *testing.T) {
	mapped, err := packed.MapAndLoad("packed/testdata/helloworld.pack")
	if err != nil {
		t.Fatal("loading test packfile:", err)
	}
	defer mapped.Close()

	orig, err := os.ReadFile("packed/testdata/helloworld.txt")
	if err != nil {
		t.Fatal("loading test textfile:", err)
	}

	h := NewMapped("", mapped)
	h.AddMapped("/foo", mapped)

	testsv := httptest.NewServer(h)
	defer testsv.Close()
	cl := testsv.Client()
	url := testsv.URL + "/helloworld.txt"

	resp, err := cl.Get(url)
	if err != nil {
		t.Fatal("executing GET request:", err)
	}
	defer resp.Body.Close()

	body, err := io.ReadAll(resp.Body)
	if err != nil {
		t.Fatal("reading response body:", err)
	}

	if !bytes.Equal(body, orig) {
		t.Error("difference in response (- got, + expected):")
		t.Error(cmp.Diff(string(body), string(orig)))
	}
}