using UnityEngine;
using System.Collections;

using System.IO;
using System.Text;
using UnityEditor;

[System.Serializable]
public class Table
{
	public string name;
	public TextAsset csvFile;
}

public class TableLoader : MonoBehaviour {
	public Table[] tables;

    public void loadTables()
    {
        StringBuilder classBody = new StringBuilder();
        foreach (Table table in tables)
        {
			currentName = table.name;
            classBody.Append(loadTable(table.csvFile));
        }

        string scriptContent = addScriptHeader(classBody.ToString());
        createScriptAsset("Assets/Generated/GameData.cs",scriptContent);
    }

    string loadTable(TextAsset csv)
    {
        string csvString = csv.text;
        string[] lines = csvString.Split("\n"[0]);

        // debug:
        /*
        foreach (string line in lines)
        {
            Debug.Log(line);
        }
        */

        if (lines.Length == 0) return "";

        string[,] grid = toGrid(lines);
        return scriptify(grid);
    }

    string [,] toGrid(string [] lines)
    {
        int fieldNum = lines[0].Split(","[0]).Length; // assumes equally sized rows
        int lineNum = lines.Length;
        if (lines[lines.Length - 1] == "") --lineNum;

        string[,] grid = new string[lineNum, fieldNum];
        for (int i = 0; i < lineNum; ++i)
        {
            string[] row = lines[i].Split(","[0]);
            for (int j = 0; j < row.Length; ++j)
            {
                grid[i, j] = row[j];
                grid[i, j] = grid[i, j].Trim(new char[] { '\n', '\r', '\t', ' '});
            }
        }

        // debug:
        /*
        for (int i = 0; i < grid.GetLength(0); ++i)
        {
            StringBuilder line = new StringBuilder();
            for (int j = 0; j < grid.GetLength(1); ++j)
            {
                line.Append(grid[i, j]);
                line.Append(" ");
            }
            Debug.Log(line);
        }
        */

        return grid;
    }

    string scriptify(string [,] grid)
    {
        StringBuilder result = new StringBuilder();
		result.Append("\tpublic static class "+currentName+" {\n");

		string tabs = "\t\t";
		float dummy = 0;
		string type = "float";
		string nullvalue = "0";
		if (grid.GetLength (0) == 2) { // no level-based data for this cvs
			for (int j = 0; j < grid.GetLength(1); ++j) {
				if (grid [0, j].Length == 0)
					continue;
				string variableName = grid [0, j];
				string value = grid [1, j];
				dummy = 0;
				type = "float";
				nullvalue = "0";
				if (!float.TryParse(grid[1,j],out dummy)) {
					value = "\"" + value + "\"";
					type = "string";
					nullvalue = "\"\"";
				}
				else {
					value = "(float)" + value;
				}
				if (value.Length == 0) {
					value = nullvalue;
				}
				result.Append (tabs + "public static "+ type + " " + variableName + " = " + value + ";\n");
			}
		} else { // rows correspond to levels
			string array_suffix = "_array";
			for (int j = 0; j < grid.GetLength(1); ++j) {
				if (grid [0, j].Length == 0)
					continue;
				string variableName = grid [0, j];
				type = "float";
				nullvalue = "0";
				for (int i = 1; i < grid.GetLength(0); ++i) {  // note that i starts from 1
					string field = grid[i,j];
					if (field.Length > 0 && !float.TryParse(field,out dummy)) {
						type = "string";
						nullvalue = "\"\"";
						break;
					}
				}
				result.Append(tabs + "public static " + type + " " + variableName + " {\n");
				result.Append(tabs + "\t" + "get {\n");
				result.Append(tabs + "\t\t" + "if (currentLevel >= 0 && currentLevel < " 
				              + variableName + array_suffix + ".Length)\n");
				result.Append(tabs + "\t\t\t" + "return " + variableName + array_suffix + "[currentLevel];\n");
				result.Append(tabs + "\t\t" + "return " + nullvalue + ";\n");
				result.Append(tabs + "\t} // get" + "\n");
				result.Append(tabs + "} // " + variableName +"\n");

				result.Append(tabs + "private static " + type + "[] " + variableName + array_suffix 
				              + " = \n");
				result.Append(tabs + "\t" + "{\n");

				for (int i = 1; i < grid.GetLength(0); ++i) {  // note that i starts from 1
					string value = grid[i,j];
					if (value.Length == 0) value = nullvalue;
					else if (type == "string") value = "\"" + value + "\"";
					else if (type == "float")  value = "(float)" + value;
					result.Append(tabs + "\t\t" + value + ",\n");
				}

				result.Append(tabs + "\t" + "}; // array " + variableName + array_suffix +"\n");
			}
		}
		result.Append("\t}// class "+currentName+"\n");

        return result.ToString();
    }

    void createScriptAsset(string path, string content) {
        if (File.Exists(path) )
        {
            File.Delete(path);
        }

        using (StreamWriter outFile = new StreamWriter(path))
        {
            outFile.Write(content);
        }
        AssetDatabase.Refresh();
    }

    string addScriptHeader(string classBody)
    {
        StringBuilder result = new StringBuilder();

        result.Append("using UnityEngine;\n");
        result.Append("\n");
        result.Append("public class GameData {\n");
		result.Append("\tprivate static int currentLevel = 0;\n");
		result.Append("\tpublic static void setLevel(int l) { currentLevel = l; }\n");
		result.Append("\tpublic static void nextLevel() {++currentLevel;}\n");

        result.Append(classBody);

        result.Append("} // class GameData");

        return result.ToString();
    }

	protected string currentName;
}