package middleware

import (
	"path/filepath"
	"strings"
	"testing"

	"github.com/stretchr/testify/assert"
	"github.com/stretchr/testify/require"

	"github.com/grafana/grafana/pkg/services/authn"
	"github.com/grafana/grafana/pkg/services/authn/authntest"
	contextmodel "github.com/grafana/grafana/pkg/services/contexthandler/model"
	"github.com/grafana/grafana/pkg/services/licensing"
	"github.com/grafana/grafana/pkg/services/user/usertest"
	"github.com/grafana/grafana/pkg/setting"
	"github.com/grafana/grafana/pkg/web"
)

func TestRecoveryMiddleware(t *testing.T) {
	t.Run("Given an API route that panics", func(t *testing.T) {
		apiURL := "/api/whatever"
		recoveryScenario(t, "recovery middleware should return JSON", apiURL, func(t *testing.T, sc *scenarioContext) {
			sc.handlerFunc = panicHandler
			sc.fakeReq("GET", apiURL).exec()
			sc.req.Header.Set("content-type", "application/json")

			assert.Equal(t, 500, sc.resp.Code)
			assert.Equal(t, "Internal Server Error - test error", sc.respJson["message"])
			assert.True(t, strings.HasPrefix(sc.respJson["error"].(string), "Server Error"))
		})
	})

	t.Run("Given a non-API route that panics", func(t *testing.T) {
		apiURL := "/whatever"
		recoveryScenario(t, "recovery middleware should return html", apiURL, func(t *testing.T, sc *scenarioContext) {
			sc.handlerFunc = panicHandler
			sc.fakeReq("GET", apiURL).exec()

			assert.Equal(t, 500, sc.resp.Code)
			assert.Equal(t, "text/html; charset=UTF-8", sc.resp.Header().Get("content-type"))
			assert.Contains(t, sc.resp.Body.String(), "<title>Grafana - Error</title>")
		})
	})
}

func panicHandler(c *contextmodel.ReqContext) {
	panic("Handler has panicked")
}

func recoveryScenario(t *testing.T, desc string, url string, fn scenarioFunc) {
	t.Run(desc, func(t *testing.T) {
		cfg := setting.NewCfg()
		cfg.ErrTemplateName = "error"
		cfg.UserFacingDefaultError = "test error"
		sc := &scenarioContext{
			t:   t,
			url: url,
			cfg: cfg,
		}

		viewsPath, err := filepath.Abs("../../public/views")
		require.NoError(t, err)

		sc.m = web.New()
		sc.m.UseMiddleware(Recovery(cfg, &licensing.OSSLicensingService{}))

		sc.m.Use(AddDefaultResponseHeaders(cfg))
		sc.m.UseMiddleware(web.Renderer(viewsPath, "[[", "]]"))

		contextHandler := getContextHandler(t, setting.NewCfg(), &authntest.FakeService{ExpectedIdentity: &authn.Identity{}})
		sc.m.Use(contextHandler.Middleware)
		// mock out gc goroutine
		sc.m.Use(OrgRedirect(cfg, usertest.NewUserServiceFake()))

		sc.defaultHandler = func(c *contextmodel.ReqContext) {
			sc.context = c
			if sc.handlerFunc != nil {
				sc.handlerFunc(sc.context)
			}
		}

		sc.m.Get(url, sc.defaultHandler)

		fn(t, sc)
	})
}
