/*
Copyright © 2023 Philipp Wolfer <phw@uploadedlobster.com>

Scotty is free software: you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation, either version 3 of the License, or (at your option) any later version.

Scotty is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.

You should have received a copy of the GNU General Public License along with
Scotty. If not, see <https://www.gnu.org/licenses/>.
*/

package config

import (
	"os"
	"path"
	"path/filepath"

	"github.com/spf13/cobra"
	"github.com/spf13/viper"
	"go.uploadedlobster.com/scotty/internal/version"
)

const (
	defaultDatabase  = "scotty.sqlite3"
	defaultOAuthHost = "127.0.0.1:2369"
)

func DefaultConfigDir() string {
	configDir, err := os.UserConfigDir()
	cobra.CheckErr(err)
	return path.Join(configDir, version.AppName)
}

// initConfig reads in config file and ENV variables if set.
func InitConfig(cfgFile string) error {
	configDir := DefaultConfigDir()
	if cfgFile != "" {
		// Use given config file
		viper.SetConfigFile(cfgFile)
	} else {
		viper.AddConfigPath(configDir)
		viper.SetConfigType("toml")
		viper.SetConfigName(version.AppName)
		viper.SetConfigPermissions(0640)
	}

	setDefaults()

	// Create global config if it does not exist
	if viper.ConfigFileUsed() == "" && cfgFile == "" {
		if err := os.MkdirAll(configDir, 0750); err == nil {
			viper.SafeWriteConfig()
		}
	}

	// read in environment variables that match
	viper.AutomaticEnv()

	// If a config file is found, read it in.
	return viper.ReadInConfig()
}

func DatabasePath() string {
	path := viper.GetString("database")
	if filepath.IsAbs(path) {
		return path
	}

	return filepath.Join(getConfigDir(), path)
}

func setDefaults() {
	viper.SetDefault("database", defaultDatabase)
	viper.SetDefault("oauth-host", defaultOAuthHost)

	// Always configure the dump backend as a default service
	viper.SetDefault("service.dump.backend", "dump")
}

func getConfigDir() string {
	return filepath.Dir(viper.ConfigFileUsed())
}