package app

import (
	"context"
	"errors"
	"fmt"
	"gitea.pena/SQuiz/common/dal"
	"gitea.pena/SQuiz/common/healthchecks"
	"gitea.pena/SQuiz/common/middleware"
	dalBS "gitea.pena/SQuiz/storer/dal"
	"gitea.pena/SQuiz/storer/service"
	"github.com/gofiber/fiber/v2"

	"gitea.pena/PenaSide/hlog"
	"github.com/minio/minio-go/v7"
	"github.com/minio/minio-go/v7/pkg/credentials"
	"github.com/skeris/appInit"
	"go.uber.org/zap"
)

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"`
	S3Endpoint     string `env:"S3_ENDPOINT" envDefault:"localhost:3002"`
	S3AccessKey    string `env:"S3_ACCESS_KEY" envDefault:"minio"`
	S3SecretKey    string `env:"S3_SECRET_KEY" envDefault:"miniostorage"`
	ClientHttpURL  string `env:"CLIENT_HTTP_URL" envDefault:"0.0.0.0:1489"`
	CrtFile        string `env:"CRT" default:"server.crt"`
	KeyFile        string `env:"KEY" default:"server.key"`
	PostgresURL    string `env:"POSTGRES_URL" envDefault:"host=localhost port=5432 user=squiz password=Redalert2 dbname=squiz sslmode=disable"`
}

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{})

	pgdal, err := dal.New(ctx, options.PostgresURL, nil)
	if err != nil {
		return nil, err
	}

	// Initialize minio client object.
	minioClient, err := minio.New(options.S3Endpoint, &minio.Options{
		Creds:  credentials.NewStaticV4(options.S3AccessKey, options.S3SecretKey, ""),
		Secure: options.IsProd,
	})
	if err != nil {
		fmt.Println("MINIOERR", options.S3Endpoint, err)
		return nil, err
	}

	blobstore, err := dalBS.New(ctx, minioClient)
	if err != nil {
		return nil, err
	}
	svc := service.New(blobstore, pgdal)

	app := fiber.New(fiber.Config{BodyLimit: 70 * 1024 * 1024})
	app.Use(middleware.JWTAuth())
	app.Get("/liveness", healthchecks.Liveness)
	app.Get("/readiness", healthchecks.Readiness(&workerErr)) //todo parametrized readiness. should discuss ready reason
	svc.Register(app)

	logger.Emit(InfoSvcReady{})

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

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