package main

import (
	"log"
	"os"

	"github.com/urfave/cli"
	"gopkg.in/yaml.v2"
)

func main() {
	app := &cli.App{
		Name:      "autoupdate",
		ArgsUsage: "[CONFIG_FILE] [VERSIONS_FILE]",

		Action: func(c *cli.Context) error {
			if c.NArg() != 2 {
				cli.ShowAppHelp(c)
			}

			var sources map[string]struct {
				Type string                 `yaml:"type"`
				Args map[string]interface{} `yaml:"args"`
			}

			conf, err := os.Open(c.Args().Get(0))
			if err != nil {
				log.Fatal(err)
				return err
			}
			defer conf.Close()

			versions, err := os.Create(c.Args().Get(1))
			if err != nil {
				log.Fatal(err)
				return err
			}
			defer versions.Close()

			err = yaml.NewDecoder(conf).Decode(&sources)
			if err != nil {
				log.Fatal(err)
				return err
			}

			new_versions := make(map[string]string, len(sources))
			for name, source := range sources {
				provider, err := GetProvider(source.Type, source.Args)
				if err != nil {
					log.Fatal(err)
					return err
				}
				v, err := provider.GetVersion()
				if err != nil {
					log.Fatal(err)
					return err
				}
				new_versions[name] = v.String()
			}
			yaml.NewEncoder(versions).Encode(new_versions)
			return nil
		},
	}
	app.Run(os.Args)
}