using UnityEngine;
using System.Collections;

public class Misc {

	public static bool checkBit(int mask, int bit)
	{
		return (mask & (1 << bit)) != 0;
	}

	public static int Clamp(int value, int min, int max) {
        if (value > max) {
            return max;
        } else if (value < min) {
            return min;
        }
        return value;
    }
    
    
    public static bool VectorInsideCircle(Vector2 circleCenter, int rad, Vector2 vec)
    {
        float a, b;
        if (vec.x > circleCenter.x)
        {
            a = vec.x - circleCenter.x;
        } else
        {
            a = circleCenter.x - vec.x;
        }
        if (vec.y > circleCenter.y)
        {
            b = vec.y - circleCenter.y;
        }
        else
        {
            b = circleCenter.y - vec.y;
        }
        float c = Mathf.Sqrt((a * a) + (b * b));
        if (c < rad)
        {
            return true;
        }
        return false;
    }

    //make first character in a string uppercase
    public static string uppercaseFirst(string s)
    {
        if (string.IsNullOrEmpty(s))
        {
            return string.Empty;
        }

        return char.ToUpper(s[0]) + s.Substring(1);
    }

    //is character allowed in a chat message?
    public static bool charAllowedInChatMessage(char c)
    {
        //letters
        if (c >= 'a' && c <= 'z')
            return true;
        //uppercase letters
        if (c >= 'A' && c <= 'Z')
            return true;
        //numbers 
        if (c >= '0' && c <= '9')
            return true;
        //special
        switch (c)
        {
            case '/':
            case ' ':
            case '-':
            case '\'':
            case '"':
                return true;
        }
        return false;
    }

    static string UppercaseFirst(string s)
    {
        // Check for empty string.
        if (string.IsNullOrEmpty(s))
        {
            return string.Empty;
        }
        // Return char and concat substring.
        return char.ToUpper(s[0]) + s.Substring(1);
    }

    public static Terrain GetClosestCurrentTerrain(Vector3 entityPos)
    {
#if UNITY_EDITOR
        Terrain[] terrains = Terrain.activeTerrains;
#else
        Terrain[] terrains = Terrain.activeTerrains;
#endif

        if (terrains.Length < 1)
            return null;

        //Get the closest one to the player
        var center = new Vector3(terrains[0].transform.position.x + terrains[0].terrainData.size.x / 2, entityPos.y, terrains[0].transform.position.z + terrains[0].terrainData.size.z / 2);
        float lowDist = (center - entityPos).sqrMagnitude;
        var terrainIndex = 0;

        for (int i = 0; i < terrains.Length; i++)
        {
            center = new Vector3(terrains[i].transform.position.x + terrains[i].terrainData.size.x / 2, entityPos.y, terrains[i].transform.position.z + terrains[i].terrainData.size.z / 2);

            //Find the distance and check if it is lower than the last one then store it
            var dist = (center - entityPos).sqrMagnitude;
            if (dist < lowDist)
            {
                lowDist = dist;
                terrainIndex = i;
            }
        }
        return terrains[terrainIndex];
    }
}