package config

import (
	"bytes"

	"github.com/shibukawa/configdir"
	"github.com/spf13/viper"
)

// AppConfig contains the base configuration fields required for lazygit.
type AppConfig struct {
	Debug      bool   `long:"debug" env:"DEBUG" default:"false"`
	Version    string `long:"version" env:"VERSION" default:"unversioned"`
	Commit     string `long:"commit" env:"COMMIT"`
	BuildDate  string `long:"build-date" env:"BUILD_DATE"`
	Name       string `long:"name" env:"NAME" default:"lazygit"`
	UserConfig *viper.Viper
}

// AppConfigurer interface allows individual app config structs to inherit Fields
// from AppConfig and still be used by lazygit.
type AppConfigurer interface {
	GetDebug() bool
	GetVersion() string
	GetCommit() string
	GetBuildDate() string
	GetName() string
	GetUserConfig() *viper.Viper
	InsertToUserConfig(string, string) error
}

// NewAppConfig makes a new app config
func NewAppConfig(name, version, commit, date string, debuggingFlag *bool) (*AppConfig, error) {
	userConfig, err := LoadUserConfig()
	if err != nil {
		panic(err)
	}

	appConfig := &AppConfig{
		Name:       "lazygit",
		Version:    version,
		Commit:     commit,
		BuildDate:  date,
		Debug:      *debuggingFlag,
		UserConfig: userConfig,
	}
	return appConfig, nil
}

// GetDebug returns debug flag
func (c *AppConfig) GetDebug() bool {
	return c.Debug
}

// GetVersion returns debug flag
func (c *AppConfig) GetVersion() string {
	return c.Version
}

// GetCommit returns debug flag
func (c *AppConfig) GetCommit() string {
	return c.Commit
}

// GetBuildDate returns debug flag
func (c *AppConfig) GetBuildDate() string {
	return c.BuildDate
}

// GetName returns debug flag
func (c *AppConfig) GetName() string {
	return c.Name
}

// GetUserConfig returns the user config
func (c *AppConfig) GetUserConfig() *viper.Viper {
	return c.UserConfig
}

func newViper() (*viper.Viper, error) {
	v := viper.New()
	v.SetConfigType("yaml")
	v.SetConfigName("config")
	return v, nil
}

// LoadUserConfig gets the user's config
func LoadUserConfig() (*viper.Viper, error) {
	v, err := newViper()
	if err != nil {
		panic(err)
	}
	if err = LoadDefaultConfig(v); err != nil {
		return nil, err
	}
	if err = LoadUserConfigFromFile(v); err != nil {
		return nil, err
	}
	return v, nil
}

// LoadDefaultConfig loads in the defaults defined in this file
func LoadDefaultConfig(v *viper.Viper) error {
	defaults := getDefaultConfig()
	return v.ReadConfig(bytes.NewBuffer(defaults))
}

// LoadUserConfigFromFile Loads the user config from their config file, creating
// the file as an empty config if it does not exist
func LoadUserConfigFromFile(v *viper.Viper) error {
	// chucking my name there is not for vanity purposes, the xdg spec (and that
	// function) requires a vendor name. May as well line up with github
	configDirs := configdir.New("jesseduffield", "lazygit")
	folder := configDirs.QueryFolderContainsFile("config.yml")
	if folder == nil {
		// create the file as an empty config and load it
		folders := configDirs.QueryFolders(configdir.Global)
		if err := folders[0].WriteFile("config.yml", []byte{}); err != nil {
			return err
		}
		folder = configDirs.QueryFolderContainsFile("config.yml")
	}
	v.AddConfigPath(folder.Path)
	if err := v.MergeInConfig(); err != nil {
		return err
	}
	return nil
}

// InsertToUserConfig adds a key/value pair to the user's config and saves it
func (c *AppConfig) InsertToUserConfig(key, value string) error {
	// making a new viper object so that we're not writing any defaults back
	// to the user's config file
	v, err := newViper()
	if err != nil {
		return err
	}
	if err = LoadUserConfigFromFile(v); err != nil {
		return err
	}
	v.Set(key, value)
	if err := v.WriteConfig(); err != nil {
		return err
	}
	return nil
}

func getDefaultConfig() []byte {
	return []byte(`
  gui:
    ## stuff relating to the UI
    scrollHeight: 2
    theme:
      activeBorderColor:
        - white
        - bold
      inactiveBorderColor:
        - white
      optionsTextColor:
        - blue
  git:
    # stuff relating to git
  os:
    # stuff relating to the OS

`)
}

// // commenting this out until we use it again
// func homeDirectory() string {
// 	usr, err := user.Current()
// 	if err != nil {
// 		log.Fatal(err)
// 	}
// 	return usr.HomeDir
// }