package health

import (
	"context"
	"net/http"
	"net/http/httptest"
	"strings"
	"testing"
)

func TestCheckHealthyServer(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		if r.URL.Path != "/healthz" || r.Method != http.MethodGet {
			http.NotFound(w, r)
			return
		}
		w.Header().Set("Content-Type", "application/json")
		_, _ = w.Write([]byte(`{"status":"ok"}`))
	}))
	defer srv.Close()

	rep := Check(context.Background(), srv.Client(), srv.URL)
	if !rep.OK {
		t.Fatalf("expected OK, got %+v", rep)
	}
	if rep.StatusCode != http.StatusOK || rep.URL != srv.URL+"/healthz" {
		t.Fatalf("unexpected report %+v", rep)
	}
	if !strings.Contains(rep.Detail, "status: ok") {
		t.Fatalf("detail should quote the status, got %q", rep.Detail)
	}
}

func TestCheckNonOriServer(t *testing.T) {
	srv := httptest.NewServer(http.NotFoundHandler())
	defer srv.Close()

	rep := Check(context.Background(), srv.Client(), srv.URL)
	if rep.OK {
		t.Fatalf("expected failure for 404, got %+v", rep)
	}
	if rep.StatusCode != http.StatusNotFound || !strings.Contains(rep.Detail, "404") {
		t.Fatalf("unexpected report %+v", rep)
	}
}

func TestCheckUnreachableServer(t *testing.T) {
	srv := httptest.NewServer(http.NotFoundHandler())
	addr := srv.URL
	srv.Close() // nothing listens there any more

	rep := Check(context.Background(), nil, addr)
	if rep.OK || rep.StatusCode != 0 {
		t.Fatalf("expected transport failure, got %+v", rep)
	}
	if !strings.Contains(rep.Detail, "cannot reach ori") {
		t.Fatalf("unexpected detail %q", rep.Detail)
	}
}

func TestCheckPlainOKBody(t *testing.T) {
	srv := httptest.NewServer(http.HandlerFunc(func(w http.ResponseWriter, _ *http.Request) {
		_, _ = w.Write([]byte("OK"))
	}))
	defer srv.Close()

	rep := Check(context.Background(), srv.Client(), srv.URL)
	if !rep.OK || rep.Detail != "ori is reachable" {
		t.Fatalf("a 2xx with a non-JSON body must still count as healthy, got %+v", rep)
	}
}

func TestCheckCancelledContext(t *testing.T) {
	ctx, cancel := context.WithCancel(context.Background())
	cancel()
	rep := Check(ctx, nil, "http://127.0.0.1:1")
	if rep.OK {
		t.Fatalf("expected failure with a cancelled context, got %+v", rep)
	}
}