package net.yt.yuncare.widgets;

import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Color;
import android.graphics.Paint;

import java.lang.*;
import java.util.Random;

/**
 * Created by lenovo on 2018/5/14.
 */

public class Code {

    //隨機數陣列
    private static final char[] CHARS = {
            '2', '3', '4', '5', '6', '7', '8', '9',
            'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h', 'j', 'k', 'm',
            'n', 'p', 'q', 'r', 's', 't', 'u', 'v', 'w', 'x', 'y', 'z',
            'A', 'B', 'C', 'D', 'E', 'F', 'G', 'H', 'I', 'J', 'K', 'L', 'M',
            'N', 'P', 'Q', 'R', 'S', 'T', 'U', 'V', 'W', 'X', 'Y', 'Z'
    };

    private static Code bmpCode;

    public static Code getInstance() { //單例模式
        if(bmpCode == null)
            bmpCode = new Code();
        return bmpCode;
    }

    //default settings
    //驗證碼預設隨機數的個數
    private static final int DEFAULT_CODE_LENGTH = 4;
    //預設字型大小
    private static final int DEFAULT_FONT_SIZE = 35;
    //預設線條的條數
    private static final int DEFAULT_LINE_NUMBER = 2;
    //padding值
    private static final int BASE_PADDING_LEFT = 10, RANGE_PADDING_LEFT = 15, BASE_PADDING_TOP = 15, RANGE_PADDING_TOP = 20;
    //驗證碼的預設寬高
    private static final int DEFAULT_WIDTH = 100, DEFAULT_HEIGHT = 40;

    //settings decided by the layout xml
    //canvas width and height
    private int width = DEFAULT_WIDTH, height = DEFAULT_HEIGHT;

    //random word space and pading_top
    private int base_padding_left = BASE_PADDING_LEFT, range_padding_left = RANGE_PADDING_LEFT,
            base_padding_top = BASE_PADDING_TOP, range_padding_top = RANGE_PADDING_TOP;

    //number of chars, lines; font size
    private int codeLength = DEFAULT_CODE_LENGTH, line_number = DEFAULT_LINE_NUMBER, font_size = DEFAULT_FONT_SIZE;

    //variables
    private String code;
    private int padding_left, padding_top;
    private Random random = new Random();
    //生成驗證碼圖片  在外部Image呼叫，用setImageBitmap新增圖片到ImageView控制元件中
    public Bitmap createBitmap() {
        padding_left = 0;
        //重點：建立Bt圖片
        Bitmap bp = Bitmap.createBitmap(width, height, Bitmap.Config.ARGB_8888); //
        Canvas c = new Canvas(bp);//建立畫板匯入bt圖片

        code = createCode();

        c.drawColor(Color.WHITE);//新增畫板背景色為白色
        Paint paint = new Paint();//建立畫筆
        paint.setAntiAlias(true);
        paint.setTextSize(font_size);//設定畫筆大小
        //畫驗證碼
        for (int i = 0; i < code.length(); i++) {
            randomTextStyle(paint); //畫筆傳入生成隨機樣式
            randomPadding();
            c.drawText(code.charAt(i) + "", padding_left, padding_top, paint);
        }
        //畫線條
        for (int i = 0; i < line_number; i++) {
            drawLine(c, paint);
        }

        c.save( Canvas.ALL_SAVE_FLAG );//儲存
        c.restore();//
        return bp;
    }

    public String getCode() {
        return code;
    }

    //生成驗證碼
    private String createCode() {
        StringBuilder buffer = new StringBuilder();
        for (int i = 0; i < codeLength; i++) {
            buffer.append(CHARS[random.nextInt(CHARS.length)]);
        }
        return buffer.toString();
    }
    //畫干擾線
    private void drawLine(Canvas canvas, Paint paint) {
        int color = randomColor();
        int startX = random.nextInt(width);
        int startY = random.nextInt(height);
        int stopX = random.nextInt(width);
        int stopY = random.nextInt(height);
        paint.setStrokeWidth(1);
        paint.setColor(color);
        canvas.drawLine(startX, startY, stopX, stopY, paint);
    }
    //生成隨機顏色
    private int randomColor() {
        return randomColor(1);
    }

    private int randomColor(int rate) {
        int red = random.nextInt(256) / rate;
        int green = random.nextInt(256) / rate;
        int blue = random.nextInt(256) / rate;
        return Color.rgb(red, green, blue);
    }
    //隨機生成文字樣式，顏色，粗細，傾斜度
    private void randomTextStyle(Paint paint) {
        int color = randomColor();
        paint.setColor(color);
        paint.setFakeBoldText(random.nextBoolean());  //true為粗體，false為非粗體
        //float skewX = random.nextInt(11) / 10;
        //skewX = random.nextBoolean() ? skewX : -skewX;
        //paint.setTextSkewX(skewX); //float型別引數，負數表示右斜，整數左斜
        //paint.setUnderlineText(true); //true為下劃線，false為非下劃線
        //paint.setStrikeThruText(true); //true為刪除線，false為非刪除線
    }
    //隨機生成padding值
    private void randomPadding() {
        padding_left += base_padding_left + random.nextInt(range_padding_left);
        padding_top = base_padding_top + random.nextInt(range_padding_top);
    }
}