//go:build !go1.16 || !finder

// +build !go1.16 !finder

package viper

import (

	"fmt"

	"os"

	"path/filepath"

	"github.com/spf13/afero"

)

// Search all configPaths for any config file.

// Returns the first path that exists (and is a config file).

func (v *Viper) findConfigFile() (string, error) {

	v.logger.Info("searching for config in paths", "paths", v.configPaths)

	for _, cp := range v.configPaths {

		file := v.searchInPath(cp)

		if file != "" {

			return file, nil

		}

	}

	return "", ConfigFileNotFoundError{v.configName, fmt.Sprintf("%s", v.configPaths)}

}

func (v *Viper) searchInPath(in string) (filename string) {

	v.logger.Debug("searching for config in path", "path", in)

	for _, ext := range SupportedExts {

		v.logger.Debug("checking if file exists", "file", filepath.Join(in, v.configName+"."+ext))

		if b, _ := exists(v.fs, filepath.Join(in, v.configName+"."+ext)); b {

			v.logger.Debug("found file", "file", filepath.Join(in, v.configName+"."+ext))

			return filepath.Join(in, v.configName+"."+ext)

		}

	}

	if v.configType != "" {

		if b, _ := exists(v.fs, filepath.Join(in, v.configName)); b {

			return filepath.Join(in, v.configName)

		}

	}

	return ""

}

// Check if file Exists

func exists(fs afero.Fs, path string) (bool, error) {

	stat, err := fs.Stat(path)

	if err == nil {

		return !stat.IsDir(), nil

	}

	if os.IsNotExist(err) {

		return false, nil

	}

	return false, err

}