package client

import (
	"io/ioutil"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestBadAuth(t *testing.T) {
	var hf http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
		if r.Header.Get("authorization") != "token TEST-TOKEN" {
			w.WriteHeader(http.StatusUnauthorized)
			return
		}
		w.Write([]byte("encoded yay"))
	}
	tests := []struct {
		name       string
		tok        string
		expectErr  bool
		expectBody bool
	}{
		{"valid token", "TEST-TOKEN", false, true},
		{"empty token", "", true, false},
		{"invalid token", "bad token", true, false},
	}
	server := httptest.NewServer(hf)
	defer server.Close()
	c := CaesarClient{Endpoint: server.URL}
	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			r, err := c.EncodeMessage(strings.NewReader("secret message"))
			if err == nil {
				t.Errorf("should have gotten error")
			}
			if r != nil {
				t.Errorf("should not have gotten a reader")
			}
		})
	}
}

func TestEncode(t *testing.T) {
	var hf http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
		w.Write([]byte("response"))
	}
	server := httptest.NewServer(hf)
	defer server.Close()
	c := CaesarClient{Endpoint: server.URL} // HL
	r, err := c.EncodeMessage(strings.NewReader("secret message"))
	if err != nil {
		t.Errorf("should not have gotten error: %v", err)
	}
	if r == nil {
		t.Errorf("should have gotten a reader")
	}
	resp, err := ioutil.ReadAll(r)
	if err != nil {
		t.Fatalf("could not read message: %v", err)
	}
	if string(resp) != "response" {
		t.Errorf("expected 'response' but got '%s'", resp)
	}
}

func TestUserAgent(t *testing.T) {
	var ua string
	var hf http.HandlerFunc = func(w http.ResponseWriter, r *http.Request) {
		ua = r.Header.Get("user-agent")
	}
	server := httptest.NewServer(hf)
	defer server.Close()

	c := CaesarClient{Endpoint: server.URL}
	c.EncodeMessage(strings.NewReader("secret message"))

	expected := "caesar-client/1.0"
	if ua != expected {
		t.Errorf("expected user agent header %q but got %q", expected, ua)
	}
}