package main

import (
	"fmt"
	"log"
	"os"
	"time"

	"github.com/knadh/koanf"
	"github.com/knadh/koanf/parsers/toml"
	"github.com/knadh/koanf/providers/confmap"
	"github.com/knadh/koanf/providers/file"
	"github.com/knadh/koanf/providers/posflag"
	flag "github.com/spf13/pflag"

	pfconfig "git.kemonine.info/PiFrame/config"
	"git.kemonine.info/PiFrame/ui"
)

func main() {
	// Command line flag handler
	f := flag.NewFlagSet("piframe", flag.ContinueOnError)
	f.Usage = func() {
		fmt.Println(f.FlagUsages())
		os.Exit(0)
	}
	// Command line flags
	f.Bool(pfconfig.CLI_FLAG_CONFIG_ONLY, false, "Only show the config UI, NOT the slideshow")
	cliFlag := f.Lookup(pfconfig.CLI_FLAG_CONFIG_ONLY)
	if cliFlag != nil {
		cliFlag.NoOptDefVal = "true"
	}
	// Process command line flags into handler
	f.Parse(os.Args[1:])

	// Main config variable
	var pfConfig = koanf.New(".")

	// Setup some defaults
	pfConfig.Load(confmap.Provider(map[string]interface{}{
		pfconfig.CONFIG_KEY_SLIDESHOW_INTERVAL:         pfconfig.DEFAULT_SLIDESHOW_INTERVAL,
		pfconfig.CONFIG_KEY_SLIDESHOW_RESTART_INTERVAL: pfconfig.DEFAULT_SLIDESHOW_RESTART_INTERVAL,
		pfconfig.CONFIG_KEY_HDMI_OFF:                   pfconfig.DEFAULT_HDMI_OFF,
		pfconfig.CONFIG_KEY_HDMI_ON:                    pfconfig.DEFAULT_HDMI_ON,
		pfconfig.CONFIG_KEY_ALBUMS_ROOT:                pfconfig.DEFAULT_ALBUMS_ROOT,
		pfconfig.CONFIG_KEY_ALBUMS_SELECTED:            []string{pfconfig.DEFAULT_ALBUM_SELECTED},
	}, "."), nil)

	// Bring in /etc/defaults/pf.toml if it exists
	configFileProvider := file.Provider(pfconfig.CONFIG_FILE_PATH)
	_, err := os.Stat(pfconfig.CONFIG_FILE_PATH)
	if os.IsNotExist(err) {
		//log.Printf("%s does not exist, USING DEFAULTS", ui.CONFIG_FILE_PATH)
	} else {
		if errConfigFile := pfConfig.Load(configFileProvider, toml.Parser()); errConfigFile != nil {
			log.Fatalf("Error loading config : %s", err)
		}
	}

	// Watch for config changes and re-load config if needed
	configFileProvider.Watch(func(event interface{}, err error) {
		if err != nil {
			log.Printf("Error setting up watch of config : %s", err)
			return
		}

		// Give the config UI a chance to save and exit clean
		time.Sleep(time.Minute)

		// Bail on slideshow if there is a config change so it restarts with updated config
		log.Fatalf("Config file changed! Exiting!")
	})

	// Process command line flags
	if err := pfConfig.Load(posflag.Provider(f, ".", pfConfig), nil); err != nil {
		log.Fatalf("Error loading command line flags : %s", err)
	}

	if !pfConfig.Bool(pfconfig.CLI_FLAG_CONFIG_ONLY) {
		ui.Slideshow(pfConfig)
	}

	// Reset the CLI flag so it's never writted to the config as 'true'
	pfConfig.Load(confmap.Provider(map[string]interface{}{
		pfconfig.CLI_FLAG_CONFIG_ONLY: false,
	}, "."), nil)

	ui.ConfigGui(pfConfig)
}