package main

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

type Config struct {
	MappingFilePath string
	MappingRules    ImportRulesMappings
}

type ImportRulesMappings struct {
	Mappings []struct {
		Protocol  string `json:"protocol"`
		VanityUrl string `json:"vanity_url"`
		RealUrl   string `json:"real_url"`
	} `json:"mappings"`
}

type ImportRuleStruct struct {
	VanityUrl string
	Proto     string
	RepoUrl   string
}

// isFile - check if fp is a valid file
func isFile(fp string) bool {
	info, err := os.Stat(fp)
	if os.IsNotExist(err) || !info.Mode().IsRegular() {
		return false
	}
	return true
}

// load mapping file
func (c *Config) LoadMappingFile(fp string) error {
	var mapping ImportRulesMappings
	mappingFilePath := fp
	if len(c.MappingFilePath) == 0 {
		ok := isFile(mappingFilePath)
		if !ok {
			return fmt.Errorf("%s is not found", mappingFilePath)
		}
	}
	mappingFile, err := os.Open(mappingFilePath)
	if err != nil {
		return err
	}
	defer mappingFile.Close()

	err = json.NewDecoder(mappingFile).Decode(&mapping)
	if err != nil {
		return err
	}
	c.MappingRules = mapping
	if len(c.MappingFilePath) == 0 {
		c.MappingFilePath = mappingFilePath
	}
	return nil
}