/*
   GoToSocial
   Copyright (C) 2021-2022 GoToSocial Authors admin@gotosocial.org

   This program is free software: you can redistribute it and/or modify
   it under the terms of the GNU Affero General Public License as published by
   the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Affero General Public License for more details.

   You should have received a copy of the GNU Affero General Public License
   along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/

package testrig

import (
	"bytes"
	"context"
	"errors"
	"fmt"
	"io"
	"net/http"
	"os"
	"os/signal"
	"syscall"

	"github.com/gin-gonic/gin"
	"github.com/superseriousbusiness/gotosocial/cmd/gotosocial/action"
	"github.com/superseriousbusiness/gotosocial/internal/api"
	apiutil "github.com/superseriousbusiness/gotosocial/internal/api/util"
	"github.com/superseriousbusiness/gotosocial/internal/concurrency"
	"github.com/superseriousbusiness/gotosocial/internal/config"
	"github.com/superseriousbusiness/gotosocial/internal/gotosocial"
	"github.com/superseriousbusiness/gotosocial/internal/gtserror"
	"github.com/superseriousbusiness/gotosocial/internal/log"
	"github.com/superseriousbusiness/gotosocial/internal/messages"
	"github.com/superseriousbusiness/gotosocial/internal/middleware"
	"github.com/superseriousbusiness/gotosocial/internal/oidc"
	"github.com/superseriousbusiness/gotosocial/internal/storage"
	"github.com/superseriousbusiness/gotosocial/internal/web"
	"github.com/superseriousbusiness/gotosocial/testrig"
)

// Start creates and starts a gotosocial testrig server
var Start action.GTSAction = func(ctx context.Context) error {
	testrig.InitTestConfig()
	testrig.InitTestLog()

	dbService := testrig.NewTestDB()
	testrig.StandardDBSetup(dbService, nil)
	var storageBackend *storage.Driver
	if os.Getenv("GTS_STORAGE_BACKEND") == "s3" {
		storageBackend, _ = storage.NewS3Storage()
	} else {
		storageBackend = testrig.NewInMemoryStorage()
	}
	testrig.StandardStorageSetup(storageBackend, "./testrig/media")

	// Create client API and federator worker pools
	clientWorker := concurrency.NewWorkerPool[messages.FromClientAPI](-1, -1)
	fedWorker := concurrency.NewWorkerPool[messages.FromFederator](-1, -1)

	// build backend handlers
	transportController := testrig.NewTestTransportController(testrig.NewMockHTTPClient(func(req *http.Request) (*http.Response, error) {
		r := io.NopCloser(bytes.NewReader([]byte{}))
		return &http.Response{
			StatusCode: 200,
			Body:       r,
		}, nil
	}, ""), dbService, fedWorker)
	mediaManager := testrig.NewTestMediaManager(dbService, storageBackend)
	federator := testrig.NewTestFederator(dbService, transportController, storageBackend, mediaManager, fedWorker)

	emailSender := testrig.NewEmailSender("./web/template/", nil)

	processor := testrig.NewTestProcessor(dbService, storageBackend, federator, emailSender, mediaManager, clientWorker, fedWorker)
	if err := processor.Start(); err != nil {
		return fmt.Errorf("error starting processor: %s", err)
	}

	/*
		HTTP router initialization
	*/

	router := testrig.NewTestRouter(dbService)

	// attach global middlewares which are used for every request
	router.AttachGlobalMiddleware(
		middleware.Logger(),
		middleware.UserAgent(),
		middleware.CORS(),
		middleware.ExtraHeaders(),
	)

	// attach global no route / 404 handler to the router
	router.AttachNoRouteHandler(func(c *gin.Context) {
		apiutil.ErrorHandler(c, gtserror.NewErrorNotFound(errors.New(http.StatusText(http.StatusNotFound))), processor.InstanceGet)
	})

	// build router modules
	var idp oidc.IDP
	var err error
	if config.GetOIDCEnabled() {
		idp, err = oidc.NewIDP(ctx)
		if err != nil {
			return fmt.Errorf("error creating oidc idp: %w", err)
		}
	}

	routerSession, err := dbService.GetSession(ctx)
	if err != nil {
		return fmt.Errorf("error retrieving router session for session middleware: %w", err)
	}

	sessionName, err := middleware.SessionName()
	if err != nil {
		return fmt.Errorf("error generating session name for session middleware: %w", err)
	}

	var (
		authModule        = api.NewAuth(dbService, processor, idp, routerSession, sessionName) // auth/oauth paths
		clientModule      = api.NewClient(dbService, processor)                                // api client endpoints
		fileserverModule  = api.NewFileserver(processor)                                       // fileserver endpoints
		wellKnownModule   = api.NewWellKnown(processor)                                        // .well-known endpoints
		nodeInfoModule    = api.NewNodeInfo(processor)                                         // nodeinfo endpoint
		activityPubModule = api.NewActivityPub(dbService, processor)                           // ActivityPub endpoints
		webModule         = web.New(processor)                                                 // web pages + user profiles + settings panels etc
	)

	// these should be routed in order
	authModule.Route(router)
	clientModule.Route(router)
	fileserverModule.Route(router)
	wellKnownModule.Route(router)
	nodeInfoModule.Route(router)
	activityPubModule.Route(router)
	webModule.Route(router)

	gts, err := gotosocial.NewServer(dbService, router, federator, mediaManager)
	if err != nil {
		return fmt.Errorf("error creating gotosocial service: %s", err)
	}

	if err := gts.Start(ctx); err != nil {
		return fmt.Errorf("error starting gotosocial service: %s", err)
	}

	// catch shutdown signals from the operating system
	sigs := make(chan os.Signal, 1)
	signal.Notify(sigs, os.Interrupt, syscall.SIGTERM)
	sig := <-sigs
	log.Infof("received signal %s, shutting down", sig)

	testrig.StandardDBTeardown(dbService)
	testrig.StandardStorageTeardown(storageBackend)

	// close down all running services in order
	if err := gts.Stop(ctx); err != nil {
		return fmt.Errorf("error closing gotosocial service: %s", err)
	}

	log.Info("done! exiting...")
	return nil
}