package server

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

func TestMain(m *testing.M) {
	slog.SetDefault(slog.New(slog.DiscardHandler))
	os.Exit(m.Run())
}

func newTestServer(t *testing.T) *Server {
	t.Helper()
	return New(&Config{Name: "test"})
}

func TestRoutes(t *testing.T) {
	s := newTestServer(t)

	tests := []struct {
		name   string
		method string
		path   string
		want   int
	}{
		{"index", http.MethodGet, "/", http.StatusOK},
		{"index style", http.MethodGet, "/css/style.css", http.StatusOK},
		{"unknown path", http.MethodGet, "/nonsense", http.StatusNotFound},
		{"wrong method", http.MethodPost, "/", http.StatusMethodNotAllowed},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			rec := httptest.NewRecorder()
			s.mux.ServeHTTP(rec, httptest.NewRequest(tt.method, tt.path, nil))

			if rec.Code != tt.want {
				t.Errorf("%s %s: got status %d, want %d", tt.method, tt.path, rec.Code, tt.want)
			}
		})
	}
}

func TestIndexRendersTemplate(t *testing.T) {
	s := New(&Config{Name: "testname123"})

	rec := httptest.NewRecorder()
	s.mux.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, "/", nil))

	body := rec.Body.String()
	if !strings.Contains(body, "testname123") {
		t.Errorf("index body doesn't contain server name, got:\n%s", body)
	}

	if ct := rec.Header().Get("Content-Type"); !strings.HasPrefix(ct, "text/html") {
		t.Errorf("got Content-Type %q, want text/html", ct)
	}
}

func TestStatusRecorder(t *testing.T) {
	t.Run("records and forwards WriteHeader", func(t *testing.T) {
		rec := httptest.NewRecorder()
		sr := &statusRecorder{ResponseWriter: rec, status: http.StatusOK}

		sr.WriteHeader(http.StatusTeapot)

		if sr.status != http.StatusTeapot {
			t.Errorf("recorder kept status %d, want %d", sr.status, http.StatusTeapot)
		}
		if rec.Code != http.StatusTeapot {
			t.Errorf("underlying writer got status %d, want %d", rec.Code, http.StatusTeapot)
		}
	})

	t.Run("defaults to 200 when handler never calls WriteHeader", func(t *testing.T) {
		rec := httptest.NewRecorder()
		sr := &statusRecorder{ResponseWriter: rec, status: http.StatusOK}

		if _, err := sr.Write([]byte("hello")); err != nil {
			t.Fatalf("Write: %v", err)
		}

		if sr.status != http.StatusOK {
			t.Errorf("recorder kept status %d, want %d", sr.status, http.StatusOK)
		}
	})
}

// TestLogRequests checks the middleware passes requests through untouched,
// on both the Write path (200) and the WriteHeader path (404).
func TestLogRequests(t *testing.T) {
	s := newTestServer(t)
	handler := logRequests(s.mux)

	tests := []struct {
		name string
		path string
		want int
	}{
		{"success passes through", "/", http.StatusOK},
		{"not found passes through", "/nonsense", http.StatusNotFound},
	}

	for _, tt := range tests {
		t.Run(tt.name, func(t *testing.T) {
			rec := httptest.NewRecorder()
			handler.ServeHTTP(rec, httptest.NewRequest(http.MethodGet, tt.path, nil))

			if rec.Code != tt.want {
				t.Errorf("got status %d, want %d", rec.Code, tt.want)
			}
		})
	}
}