package cmd

import (
	"encoding/json"
	"errors"
	"io/ioutil"
	"net/http"
	"strings"

	"go.jolheiser.com/gpm/config"

	"github.com/urfave/cli/v2"
	"go.jolheiser.com/beaver"
)

var Import = cli.Command{
	Name:  "import",
	Usage: "Import JSON for local packages",
	Flags: []cli.Flag{
		&cli.BoolFlag{
			Name:    "force",
			Aliases: []string{"f"},
			Usage:   "Overwrite any existing packages without prompt",
		},
	},
	Action: doImport,
}

func doImport(ctx *cli.Context) error {
	cfg, err := config.Load()
	if err != nil {
		return err
	}

	if ctx.NArg() == 0 {
		return errors.New("must point to either a JSON file or gpm server export endpoint")
	}

	arg := ctx.Args().First()
	isJSON := strings.HasSuffix(arg, ".json")
	isHTTP := strings.HasPrefix(arg, "http")

	if !isJSON && !isHTTP {
		return errors.New("must point to either a JSON file or gpm server export endpoint")
	}

	var data []byte
	if isJSON {
		data, err = ioutil.ReadFile(arg)
		if err != nil {
			return err
		}
	} else if isHTTP {
		resp, err := http.Get(arg)
		if err != nil {
			return err
		}

		data, err = ioutil.ReadAll(resp.Body)
		if err != nil {
			return err
		}
		defer resp.Body.Close()
	}

	var importPkgs []config.Package
	if err := json.Unmarshal(data, &importPkgs); err != nil {
		return err
	}
	cfg.AddPackages(ctx.Bool("force"), importPkgs...)

	if err := cfg.Save(); err != nil {
		return err
	}

	beaver.Info("Import complete")
	return nil
}