package main

import (
	"encoding/json"
	"io"
	"strings"
)

type charInfo struct {
	Nicks     []string `json:"nicks"`
	Name      string   `json:"name"`
	Author    string   `json:"player"`
	ShortName string   `json:"first"`
}

func load(reader io.Reader) ([]charInfo, error) {
	data := make(map[string]interface{})
	err := json.NewDecoder(reader).Decode(&data)
	if err != nil {
		return nil, err
	}

	links := make(map[string]string, len(data))
	infos := make([]charInfo, 0, 64)

	for key, value := range data {
		if info, ok := value.(map[string]interface{}); ok {
			name := info["name"].(string)
			author := info["player"].(string)
			shortName, ok := info["first"].(string)
			if !ok {
				shortName = strings.SplitN(name, " ", 2)[0]
			}

			infos = append(infos, charInfo{
				Nicks:     []string{key},
				Name:      name,
				Author:    author,
				ShortName: shortName,
			})
		} else if nick, ok := value.(string); ok {
			links[key] = nick
		}
	}

	for key, value := range links {
		for i := range infos {
			if infos[i].Nicks[0] == value {
				infos[i].Nicks = append(infos[i].Nicks, key)
			}
		}
	}

	return infos, nil
}