package process

import (
	"fmt"
	"os"
	"time"

	"git.eeqj.de/sneak/formless/database"
	_ "github.com/jinzhu/gorm/dialects/postgres"
	_ "github.com/jinzhu/gorm/dialects/sqlite"
	"github.com/k0kubun/pp"
	"github.com/mattn/go-isatty"
	"github.com/rs/zerolog"
	"github.com/rs/zerolog/log"
	"github.com/spf13/viper"
)

// CLIEntry is the main entrypoint
func CLIEntry(version string, buildarch string) int {
	f := new(Formless)
	f.version = version
	f.buildarch = buildarch
	f.configure()
	f.setupLogging()
	f.setupDatabase()
	return f.runForever()
}

// Feta is the main structure/process of this app
type Formless struct {
	version   string
	buildarch string
	api       *Server
	dbm       *database.Manager
	startup   time.Time
}

func (f *Formless) configure() {
	viper.SetConfigName("formless")
	viper.SetConfigType("yaml")
	viper.AddConfigPath("/etc/formless")          // path to look for the config file in
	viper.AddConfigPath("$HOME/.config/formless") // call multiple times to add many search paths

	viper.SetEnvPrefix("FORMLESS")
	viper.AutomaticEnv()

	viper.SetDefault("Debug", false)
	viper.SetDefault("DBURL", fmt.Sprintf("sqlite://%s", os.ExpandEnv("$HOME/Library/ApplicationSupport/formless/formless.db")))

	if err := viper.ReadInConfig(); err != nil {
		if _, ok := err.(viper.ConfigFileNotFoundError); ok {
			// Config file not found; ignore error if desired
		} else {
			// Config file was found but another error was produced
			log.Panic().
				Err(err).
				Msg("cannot read config file")
		}
	}

	if viper.GetBool("debug") {
		pp.Print(viper.AllSettings())
	}
}

func (f *Formless) identify() {
	log.Info().
		Str("version", f.version).
		Str("buildarch", f.buildarch).
		Msg("starting")
}

func (f *Formless) setupDatabase() {
	f.dbm = database.New()
}

func (f *Formless) setupLogging() {

	log.Logger = log.With().Caller().Logger()

	tty := isatty.IsTerminal(os.Stdin.Fd()) || isatty.IsCygwinTerminal(os.Stdin.Fd())

	if tty {
		out := zerolog.NewConsoleWriter(
			func(w *zerolog.ConsoleWriter) {
				// Customize time format
				w.TimeFormat = time.RFC3339
			},
		)
		log.Logger = log.Output(out)
	}

	// always log in UTC
	zerolog.TimestampFunc = func() time.Time {
		return time.Now().UTC()
	}

	zerolog.SetGlobalLevel(zerolog.InfoLevel)
	if viper.GetBool("debug") {
		zerolog.SetGlobalLevel(zerolog.DebugLevel)
	}

	f.identify()
}

func (f *Formless) uptime() time.Duration {
	return time.Since(f.startup)
}

func (f *Formless) runForever() int {
	f.startup = time.Now()

	home := os.Getenv("HOME")
	if home == "" {
		panic("can't find home directory")
	}

	f.api = new(Server)
	f.api.SetFormless(f) // api needs to get to us to access data

	go f.api.Serve()

	// this goroutine (main) does nothing until we handle signals
	// maybe use a context or something
	// FIXME(sneak)
	for {
		time.Sleep(1 * time.Second)
	}

	return 0
}