package config

import (
	"encoding/json"
	"fmt"
	"os"
)

type Config struct {
	DBURL           string `json:"db_url"`
	CurrentUsername string `json:"current_user_name"`
}

func getConfigFilePath() (string, error) {
	const configFileName = ".gatorconfig.json"
	homeDir, err := os.UserHomeDir()
	if err != nil {
		return "", err
	}
	configFilePath := homeDir + "/" + configFileName
	return configFilePath, nil
}

func write(cfg *Config) error {
	configFilePath, err := getConfigFilePath()
	if err != nil {
		return err
	}
	configPretty, err := json.MarshalIndent(cfg, "", "  ")
	if err != nil {
		return err
	}
	err = os.WriteFile(configFilePath, configPretty, 0644)
	if err != nil {
		return err
	}
	return nil
}

func (cfg *Config) Read() Config {
	configFilePath, err := getConfigFilePath()
	if err != nil {
		panic(err)
	}
	configFile, err := os.ReadFile(configFilePath)
	if err != nil {
		panic(err)
	}
	var configData Config
	if err := json.Unmarshal(configFile, &configData); err != nil {
		panic(err)
	}
	return configData
}

func (cfg *Config) SetUser(userName string) error {
	if userName == "" {
		return fmt.Errorf("username cannot be empty string")
	}
	cfg.CurrentUsername = userName
	if err := write(cfg); err != nil {
		return fmt.Errorf("could not set current user! Err: %w", err)
	}
	return nil
}