using System;
using System.Text;
using System.Text.RegularExpressions;
using UnityEditor;
using UnityEngine;

public class BackgroundColorScope : GUI.Scope
{
    private readonly Color color;
    public BackgroundColorScope(Color color)
    {
        this.color = GUI.backgroundColor;
        GUI.backgroundColor = color;
    }


    protected override void CloseScope()
    {
        GUI.backgroundColor = color;
    }
}

public class JsonFormat : EditorWindow
{
    static JsonFormat g_JsonFormatWindow;

    string textArea = "";
    string selectableLabel = "";
    int stringLength = 0;

    Vector2 leftScrollPos = Vector2.zero;

    [MenuItem("Window/JsonFormat")]
    static void Open()
    {
        if (g_JsonFormatWindow == null)
        {
            g_JsonFormatWindow = CreateInstance<JsonFormat>();
        }

        g_JsonFormatWindow.Show();
    }

    void OnGUI()
    {
        //エスケープを押した時に閉じる
        if (Event.current.keyCode == KeyCode.Escape)
        {
            g_JsonFormatWindow.Close();
        }

        using (new EditorGUILayout.HorizontalScope())
        {
            if (GUILayout.Button("整形する"))
            {
                selectableLabel = ToReadable(textArea);
                stringLength = selectableLabel.Length;
            }
            if (GUILayout.Button("圧縮する"))
            {
                selectableLabel = ToCompression(textArea);
                stringLength = selectableLabel.Length;
            }
            using (new BackgroundColorScope(stringLength > 0 ?  Color.green : Color.clear))
            {
                //文字があれば緑色にする.
                if (GUILayout.Button("クリップボードにコピー"))
                {
                    EditorGUIUtility.systemCopyBuffer = selectableLabel;
                }
            }

            Color oldColor = GUI.color;
            GUI.color = textArea.Length > 14000 ? Color.red : oldColor;
            GUILayout.Box(textArea.Length.ToString());
            GUI.color = oldColor;
        }

        textArea = EditorGUILayout.TextArea(textArea, GUILayout.Height(position.height / 3 - 30));

        leftScrollPos = EditorGUILayout.BeginScrollView(leftScrollPos, GUI.skin.box);
        {
            EditorGUILayout.SelectableLabel(selectableLabel, GUILayout.Height(6000));
        }
        EditorGUILayout.EndScrollView();
    }

    public static string ToReadable(string json)
    {
        if (string.IsNullOrWhiteSpace(json)) return json;
        int i = 0;
        int indent = 0;
        int quoteCount = 0;
        int position = -1;
        var sb = new StringBuilder();
        int lastindex = 0;
        while (true)
        {
            if (i > 0 && json[i] == '"' && json[i - 1] != '\\') quoteCount++;

            if (quoteCount % 2 == 0)
            {
                if (json[i] == '{' || json[i] == '[')
                {
                    indent++;
                    position = 1;
                }
                else if (json[i] == '}' || json[i] == ']')
                {
                    indent--;
                    position = 0;
                }
                else if (json.Length > i && json[i] == ',' /*&& json[i + 1] == '"'*/)
                {
                    position = 1;
                }
                if (position >= 0)
                {
                    sb.AppendLine(json.Substring(lastindex, i + position - lastindex));
                    sb.Append(new string(' ', indent * 4));
                    lastindex = i + position;
                    position = -1;
                }
            }

            i++;
            if (json.Length <= i)
            {
                sb.Append(json.Substring(lastindex));
                break;
            }
        }
        return sb.ToString();
    }

    public static string ToCompression(string s)
    {
        string temp = s.Replace("\r", "").Replace("\n", "");
        temp = Regex.Replace(temp, @"\s", "");
        return temp;
    }
}