using UnityEngine;
using System.Collections;
using System.Collections.Generic;
using System.Text.RegularExpressions;

// Stores long or frequently repeated strings in a dictionary.
// Strings can then be retrieved using a short key string.
public class StringTable
{
	Dictionary<string, string> stringTable = new Dictionary<string, string>();

	public void ClearStringTable()
	{
		stringTable.Clear();
	}

	// Retrieves a string from the table
	public string GetString(string key)
	{
		if (stringTable.ContainsKey(key))
		{
			return stringTable[key];
		}
		return "";
	}
	
	// Adds or updates a string in the table
	public void SetString(string key, string value)
	{
		stringTable[key] = value;
	}

	// Replace keys in the input string with the string table entry
	// Example format: "This {string_key} string"
	public string SubstituteStrings(string text)
	{
		string subbedText = text;
		
		// Instantiate the regular expression object.
		Regex r = new Regex("{.*?}");
		
		// Match the regular expression pattern against a text string.
		var results = r.Matches(text);
		foreach (Match match in results)
		{
			string stringKey = match.Value.Substring(1, match.Value.Length - 2);
			string stringValue = GetString(stringKey);
			
			subbedText = subbedText.Replace(match.Value, stringValue);
		}
		
		return subbedText;
	}

	// Chops a string at the first new line character
	// Useful for link / button strings that must fit on a single line
	public string FormatLinkText(string text)
	{
		string trimmed;
		if (text.Contains("\n"))
		{
			trimmed = text.Substring(0, text.IndexOf("\n"));
		}
		else
		{
			trimmed = text;
		}
		
		return trimmed;
	}
}