package app

import (
	"context"
	"errors"
	"fmt"
	"github.com/gofiber/fiber/v2"
	"github.com/skeris/appInit"
	"github.com/themakers/hlog"
	"go.uber.org/zap"
	"penahub.gitlab.yandexcloud.net/backend/penahub_common/privilege"
	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/dal"
	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/healthchecks"
	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/middleware"
	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/model"
	"penahub.gitlab.yandexcloud.net/backend/quiz/common.git/utils"
	"penahub.gitlab.yandexcloud.net/backend/quiz/core.git/clients/auth"
	"penahub.gitlab.yandexcloud.net/backend/quiz/core.git/service"
	"penahub.gitlab.yandexcloud.net/backend/quiz/core.git/tools"
	"time"
)

type App struct {
	logger *zap.Logger
	err    chan error
}

func (a App) GetLogger() *zap.Logger {
	return a.logger
}

func (a App) GetErr() chan error {
	return a.err
}

var (
	errInvalidOptions = errors.New("invalid options")
)

var zapOptions = []zap.Option{
	zap.AddCaller(),
	zap.AddCallerSkip(2),
	zap.AddStacktrace(zap.ErrorLevel),
}

var _ appInit.CommonApp = (*App)(nil)

type Options struct {
	LoggerProdMode      bool   `env:"IS_PROD_LOG" default:"false"`
	IsProd              bool   `env:"IS_PROD" default:"false"`
	NumberPort          string `env:"PORT" default:"1488"`
	CrtFile             string `env:"CRT" default:"server.crt"`
	KeyFile             string `env:"KEY" default:"server.key"`
	PostgresCredentials string `env:"PG_CRED" default:"host=localhost port=35432 user=squiz password=Redalert2 dbname=squiz sslmode=disable"`
	HubAdminUrl         string `env:"HUB_ADMIN_URL" default:"http://localhost:8001/"`
	ServiceName         string `env:"SERVICE_NAME" default:"squiz"`
	AuthServiceURL      string `env:"AUTH_URL" default:"http://localhost:8000/"`
	RedirectURL         string `env:"REDIRECT_URL" default:"https://squiz.pena.digital"`
	PubKey              string `env:"PUBLIC_KEY"`
	PrivKey             string `env:"PRIVATE_KEY"`
}

func New(ctx context.Context, opts interface{}, ver appInit.Version) (appInit.CommonApp, error) {
	var (
		err, workerErr error
		zapLogger      *zap.Logger
		errChan        = make(chan error)
		options        Options
		ok             bool
	)

	if options, ok = opts.(Options); !ok {
		return App{}, errInvalidOptions
	}

	if options.LoggerProdMode {
		zapLogger, err = zap.NewProduction(zapOptions...)
		if err != nil {
			return nil, err
		}
	} else {
		zapLogger, err = zap.NewDevelopment(zapOptions...)
		if err != nil {
			return nil, err
		}
	}

	zapLogger = zapLogger.With(
		zap.String("SvcCommit", ver.Commit),
		zap.String("SvcVersion", ver.Release),
		zap.String("SvcBuildTime", ver.BuildTime),
	)

	logger := hlog.New(zapLogger)
	logger.Emit(InfoSvcStarted{})

	authClient := auth.NewAuthClient(options.AuthServiceURL)

	pgdal, err := dal.New(ctx, options.PostgresCredentials, authClient, nil)
	if err != nil {
		fmt.Println("NEW", err)
		return nil, err
	}

	if err := pgdal.Init(); err != nil {
		fmt.Println("INIT", err)
		return nil, err
	}

	clientData := privilege.Client{
		URL:         options.HubAdminUrl,
		ServiceName: options.ServiceName,
		Privileges:  model.Privileges,
	}
	fiberClient := &fiber.Client{}
	privilegeController := privilege.NewPrivilege(clientData, fiberClient)
	go tools.PublishPrivilege(privilegeController, 10, 5*time.Minute)

	encrypt := utils.NewEncrypt(options.PubKey, options.PrivKey)
	app := fiber.New()
	app.Use(middleware.JWTAuth())
	app.Get("/liveness", healthchecks.Liveness)
	app.Get("/readiness", healthchecks.Readiness(&workerErr)) //todo parametrized readiness. should discuss ready reason

	svc := service.New(service.Deps{
		Dal:         pgdal,
		RedirectURl: options.RedirectURL,
		Encrypt:     encrypt,
	})

	svc.Register(app)

	logger.Emit(InfoSvcReady{})

	go func() {
		defer func() {
			if pgdal != nil {
				pgdal.Close()
			}
			err := app.Shutdown()
			logger.Emit(InfoSvcShutdown{Signal: err.Error()})
		}()

		if options.IsProd {
			if err := app.ListenTLS(fmt.Sprintf(":%s", options.NumberPort), options.CrtFile, options.KeyFile); err != nil {
				logger.Emit(ErrorCanNotServe{
					Err: err,
				})
				errChan <- err
			}
		} else {
			if err := app.Listen(fmt.Sprintf(":%s", options.NumberPort)); err != nil {
				logger.Emit(ErrorCanNotServe{
					Err: err,
				})
				errChan <- err
			}
		}

		errChan <- nil
	}()
	// todo implement helper func for service app type. such as server preparing, logger preparing, healthchecks and etc.
	return &App{
		logger: zapLogger,
		err:    errChan,
	}, err
}