#!/bin/bash

# =====================================
# BASIC ARITHMETIC OPERATIONS
# =====================================
basic_arithmetic_demo() {
    echo "=== Asosiy Matematik Amallar ==="
    local num1=25
    local num2=7

    echo "Raqamlar: num1=$num1, num2=$num2"
    echo

    # $(( )) - Butun sonlar uchun eng samarali usul
    echo "$(( )) usuli:"
    echo "  Qo'shish:      $num1 + $num2 = $((num1 + num2))"
    echo "  Ayirish:       $num1 - $num2 = $((num1 - num2))"
    echo "  Ko'paytirish:  $num1 * $num2 = $((num1 * num2))"
    echo "  Bo'lish:       $num1 / $num2 = $((num1 / num2))"
    echo "  Qoldiq:        $num1 % $num2 = $((num1 % num2))"
    echo "  Daraja:        $num1 ** 2 = $((num1 ** 2))"
    echo

    # expr usuli
    echo "expr usuli:"
    echo "  Qo'shish:      $(expr $num1 + $num2)"
    echo "  Ko'paytirish:  $(expr $num1 \* $num2)"
    echo "  Bo'lish:       $(expr $num1 / $num2)"
    echo
}

# =====================================
# INCREMENT AND DECREMENT
# =====================================
increment_decrement_demo() {
    echo "=== Increment va Decrement ==="
    local counter=10
    echo "Dastlabki qiymat: $counter"

    echo "Pre-increment:  $((++counter))"  # Oshiradi, keyin natijani beradi
    echo "Post-increment: $((counter++))"  # Natijani beradi, keyin oshiradi
    echo "Hozirgi qiymat: $counter"
    echo
}

# =====================================
# FLOATING POINT ARITHMETIC (bc & awk)
# =====================================
floating_point_demo() {
    echo "=== Floating Point (Haqiqiy sonlar) ==="
    local n1=15.75
    local n2=4.25

    # bc (Basic Calculator) orqali hisoblash
    echo "bc bilan bo'lish: $(echo "scale=2; $n1 / $n2" | bc)"

    # awk orqali hisoblash
    echo "awk bilan ko'paytirish: $(awk "BEGIN {print $n1 * $n2}")"
    echo
}

# =====================================
# CALCULATOR IMPLEMENTATION
# =====================================
calculator_demo() {
    while true; do
        echo -e "\n--- ODDY KALKULYATOR ---"
        echo "1. Qo'shish  2. Ayirish  3. Ko'paytirish"
        echo "4. Bo'lish   5. Daraja   6. Chiqish"

        read -p "Tanlov (1-6): " opt
        [[ $opt == 6 ]] && { echo "Dastur tugadi."; break; }

        read -p "1-son: " num1
        read -p "2-son: " num2

        # Raqam ekanligini tekshirish
        if ! [[ $num1 =~ ^-?[0-9.]+$ ]] || ! [[ $num2 =~ ^-?[0-9.]+$ ]]; then
            echo "❌ Xato: Faqat raqam kiriting!"; continue
        fi

        case $opt in
            1) res=$(echo "$num1 + $num2" | bc -l) ;;
            2) res=$(echo "$num1 - $num2" | bc -l) ;;
            3) res=$(echo "$num1 * $num2" | bc -l) ;;
            4)
                if (( $(echo "$num2 == 0" | bc -l) )); then
                    res="Xato (Nolga bo'lish!)"
                else
                    res=$(echo "scale=4; $num1 / $num2" | bc -l)
                fi
                ;;
            5) res=$(echo "$num1 ^ $num2" | bc -l) ;;
            *) echo "Noto'g'ri tanlov!"; continue ;;
        esac
    
        echo -e "✅ Natija: $res"
    done
}

# Funksiyalarni ishga tushirish
basic_arithmetic_demo
increment_decrement_demo
floating_point_demo
# calculator_demo # Kalkulyatorni ishlatish uchun ushbu qatorni oching