package com.example.nguye.chngtrnhtnhchsbmi

import android.support.v7.app.AppCompatActivity
import android.os.Bundle
import android.os.Message
import android.widget.Button
import android.widget.EditText
import android.widget.Toast
import kotlinx.android.synthetic.main.activity_main.*
import java.math.RoundingMode
import java.text.DecimalFormat
import kotlin.math.pow

class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        button_TinhBMI.setOnClickListener(){
            Tinh()
        }
    }

    fun NgoaiLeTen(message: String): Nothing
    {
        throw Exception(message)
    }

    fun Tinh()
    {
        try {
            val butChanDoan = findViewById<Button>(R.id.button_TinhBMI)
            val editTen = findViewById<EditText>(R.id.editText_ten)
            val editChieuCao = findViewById<EditText>(R.id.editText_ChieuCao)
            val editCanNang = findViewById<EditText>(R.id.editText_CanNang)
            val editBMI = findViewById<EditText>(R.id.editText_BMI)
            val editChanDoan = findViewById<EditText>(R.id.editText_ChanDoan)

            val H: Double = editChieuCao.text.toString().toDouble()
            val W: Double = editCanNang.text.toString().toDouble()
            val BMI: Double = W / (H / 100.0).pow(2)
            var chuandoan = ""

            val HoTen = editTen.text.toString().trim()

            var isNum = true
            isNum = HoTen.matches("-?\\d+(\\.\\d+)?".toRegex())


            if (HoTen == "" || isNum)
                throw NgoaiLeTen("Vui lòng nhập lại tên")

            if (BMI < 18)
                chuandoan = "Bạn gầy"
            else if (BMI <= 24.9)
                chuandoan = "Bạn bình thường"
            else if (BMI <= 29.9)
                chuandoan = "Bạn béo phì độ 1"
            else if (BMI <= 34.9)
                chuandoan = "Bạn béo phì độ 2"
            else
                chuandoan = "Khủng long"
            val df = DecimalFormat("#.0")
            df.roundingMode = RoundingMode.CEILING
            Toast.makeText(this@MainActivity, "Vui lòng chờ! Bạn đã Click vào nút" + butChanDoan.text.toString(), Toast.LENGTH_LONG).show()
            Toast.makeText(this@MainActivity, "Xin chào " + editTen.text.toString() + " đã có kết quả!", Toast.LENGTH_LONG).show()

            editBMI.setText(df.format(BMI))
            editChanDoan.setText(chuandoan)
        }
        catch (ex: NullPointerException)
        {
            Toast.makeText(this@MainActivity, "Lỗi NullPointerException", Toast.LENGTH_LONG).show()
        }
        catch (ex: Exception)
        {
            Toast.makeText(this@MainActivity, "Không hợp lệ. " + ex.message, Toast.LENGTH_LONG).show()
        }
    }

}