package config

import (
	"errors"
	"fmt"
	"os"
	"path"

	"github.com/mitchellh/go-homedir"
)

var confFileName = "papero.toml"
var ErrConfigNotFound = errors.New("unable to find configuration")
var ErrFailedToParseConfig = errors.New("unable to cast into usable configuration")

func Parse(filePath string) (*MemConfig, error) {
	fileConfig, err := parseFile(filePath)
	if err != nil {
		return nil, err
	}
	memConfig, castingErrs := parseConfig(fileConfig)
	if !castingErrs.Check() {
		return nil, ErrFailedToParseConfig
	}
	return memConfig, nil
}

// Find looks for the configuration file in the following order:
//   - $PWD/papero.toml
//   - ~/.config/papero/papero.toml
//   - ~/.papero.toml
//   - /etc/papero.toml
// returns and error if no file has been found
func Find() (string, error) {
	var paths []string

	// Try to append $PWD/papero.toml
	cwd, err := os.Getwd()
	if err == nil {
		paths = append(paths, path.Join(cwd, confFileName))
	}

	// Try to append ~/.config/papero/papero.toml and ~/.papero.toml
	home, err := homedir.Dir()
	if err == nil {
		paths = append(paths, path.Join(home, ".config", "papero", confFileName))
		paths = append(paths, path.Join(home, fmt.Sprintf(".%s", confFileName)))
	}

	// Append /etc/papero.toml
	paths = append(paths, path.Join("/etc", confFileName))

	for _, file := range paths {
		info, err := os.Stat(file)
		if err == nil && !info.IsDir() {
			return file, nil
		}
	}
	return "", ErrConfigNotFound
}