package config

import (
	"encoding/json"
	"fmt"
	"github.com/AlecAivazis/survey/v2"
	"github.com/BurntSushi/toml"
	"github.com/mitchellh/go-homedir"
	"go.jolheiser.com/beaver"
	"os"
	"path"
	"strings"
)

var (
	configPath string
	cfg        *Config
	Version    = "develop"

	// Config items

	GPMURL   string
	Packages []Package
)

type Config struct {
	GPMURL   string    `toml:"gpm-url" json:"gpm_url"`
	Packages []Package `toml:"package" json:"packages"`
}

type Package struct {
	Name   string `toml:"name" json:"name"`
	Import string `toml:"import" json:"import"`
}

// Load on init so that CLI contexts are correctly populated
func init() {
	home, err := homedir.Dir()
	if err != nil {
		beaver.Fatalf("could not locate home directory: %v", err)
	}
	configPath = fmt.Sprintf("%s/.gpm/config.toml", home)

	if _, err := os.Stat(configPath); os.IsNotExist(err) {
		if err := os.MkdirAll(path.Dir(configPath), os.ModePerm); err != nil {
			beaver.Fatalf("could not create gpm home: %v", err)
		}

		if _, err := os.Create(configPath); err != nil {
			beaver.Fatalf("could not create gpm config: %v", err)
		}
	}

	if _, err := toml.DecodeFile(configPath, &cfg); err != nil {
		beaver.Fatalf("could not decode gpm config: %v", err)
	}

	dupe := make(map[string]bool)
	for _, pkg := range cfg.Packages {
		name := strings.ToLower(pkg.Name)
		if ok := dupe[name]; ok {
			beaver.Fatalf("duplicate package for %s", pkg.Name)
		}
		dupe[name] = true
	}

	GPMURL = cfg.GPMURL
	Packages = cfg.Packages
}

func Save() error {
	cfg.GPMURL = GPMURL
	cfg.Packages = Packages

	fi, err := os.Create(configPath)
	if err != nil {
		return err
	}
	defer fi.Close()

	if err := toml.NewEncoder(fi).Encode(cfg); err != nil {
		return err
	}

	return nil
}

func Export() (string, error) {
	data, err := json.Marshal(Packages)
	return string(data), err
}

func PackageMap() map[string]Package {
	pkgs := make(map[string]Package)
	for _, pkg := range Packages {
		pkgs[pkg.Name] = pkg
	}
	return pkgs
}

func AddPackages(force bool, pkgs ...Package) {
	for _, pkg := range pkgs {
		for idx, p := range Packages {
			if strings.EqualFold(p.Name, pkg.Name) {
				if force {
					Packages[idx] = pkg
					break
				}

				forceQuestion := &survey.Confirm{
					Message: fmt.Sprintf("Package `%s` (%s) already exists. Overwrite with `%s`?", p.Name, p.Import, p.Import),
					Default: false,
				}
				var forceAnswer bool

				if err := survey.AskOne(forceQuestion, &forceAnswer); err != nil {
					beaver.Error(err)
					break
				}

				if !forceAnswer {
					beaver.Errorf("leaving package `%s` as-is", pkg.Name)
					break
				}

				Packages[idx] = pkg
				break
			}
		}
		Packages = append(Packages, pkg)
	}
}