// Name: Sandipsinh Rathod
// Email: sdr5549@psu.edu
// Class: CMPSC 330
// Program Exact Number
// Current Date: 4/11/24 4:25 PM
// Due Date: 5/11/24
//
// Description:
// Implementation for +, -, *, /, =, +=, -=, *=, /=, ==, !=, <, >, <=, >= etc.

#include <iostream>
#include <sstream>
#include <limits>
#include <string>
#include "exact_number.h"


using namespace std;


string error_msg(string rand, ExactNumber &n, double ans) {
    ostringstream msg;
    msg << "  " << rand << " failed with " << static_cast<double>(n) << "... expecting " << ans;
    return msg.str();
}

string error_msg(string rand, ExactNumber &n1, ExactNumber &n2, bool ans) {
    ostringstream msg;
    msg << "  " << rand << " failed with " << ans << "... expecting " << !ans
        << " => " << n1 << " : " << n2 << endl;
    return msg.str();
}


int main() {
    cout << "Testing ExactNumber..." << endl << endl;

    cout << "Manual check:";
    cout << "   operator<<   should print an ExactNumber as \"(a/b)\"" << endl;

    ExactNumber e1;    // default constructor
    cout << "  manual check for (0/1) : " << e1 << endl;

    ExactNumber e2(3);  // memberwise-copy constructor
    cout << "  manual check for (3/1) : " << e2 << endl;

    ExactNumber e3(5, 2);  // memberwise-copy constructor
    cout << "  manual check for (5/2) : " << e3 << endl;

    ExactNumber e4(e3);   // copy constructor
    cout << "  manual check for (5/2) : " << e4 << endl;

    ExactNumber e5(10, 5);  // simplification
    cout << "  manual check for (2/1) : " << e5 << endl;


    cout << endl;
    cout << "Automatic check" << endl;
    cout.precision(numeric_limits<double>::digits10);

    unsigned int num_tests = 0;
    unsigned int num_failed = 0;

    ExactNumber n1(2, 4), n2(5, 3), n3(5, 6), n4;

    // =
    num_tests++;
    n4 = n1;
    try { if (static_cast<double>(n4) != 1.0 / 2.0) throw error_msg("operator=", n4, 1.0 / 2.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // +=, -=, *=, /=
    num_tests++;
    n4 += n2;
    try { if (static_cast<double>(n4) != 13.0 / 6.0) throw error_msg("opeator=", n4, 13.0 / 6.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 -= n2;
    try { if (static_cast<double>(n4) != 1.0 / 2.0) throw error_msg("operator-=", n4, 1.0 / 2.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 *= n2;
    try { if (static_cast<double>(n4) != 5.0 / 6.0) throw error_msg("operator*=", n4, 5.0 / 6.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 /= n2;
    try { if (static_cast<double>(n4) != 1.0 / 2.0) throw error_msg("operator/=", n4, 1.0 / 2.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }


    // +, -, *, /
    num_tests++;
    n4 = n1 + n2;
    try { if (static_cast<double>(n4) != 13.0 / 6.0) throw error_msg("operator+", n4, 13.0 / 6.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = n1 - n2;
    try { if (static_cast<double>(n4) != -7.0 / 6.0) throw error_msg("operator-", n4, -7.0 / 6.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = n1 * n2;
    try { if (static_cast<double>(n4) != 5.0 / 6.0) throw error_msg("operator*", n4, 5.0 / 6.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = n1 / n2;
    try { if (static_cast<double>(n4) != 3.0 / 10.0) throw error_msg("operator/", n4, 3.0 / 10.0); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // ==, !=
    num_tests++;
    n4 = n1 * n2;
    bool result = n4 == n3;
    try { if (result != true) throw error_msg("operator==", n4, n3, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n1 == n2;
    try { if (result != false) throw error_msg("operator==", n4, n1, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n1 != n2;
    try { if (result != true) throw error_msg("operator!=", n1, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n4 != n3;
    try { if (result != false) throw error_msg("operator!=", n1, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // <, >, <=, >=
    num_tests++;
    result = n1 < n2;
    try { if (result != true) throw error_msg("operator<", n1, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n2 > n3;
    try { if (result != true) throw error_msg("operator>", n2, n3, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n1 <= n2;
    try { if (result != true) throw error_msg("operator<=", n1, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }


    num_tests++;
    result = n2 <= n2;
    try { if (result != true) throw error_msg("operator<=", n2, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n2 >= n3;
    try { if (result != true) throw error_msg("operator>=", n2, n3, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    result = n2 >= n2;
    try { if (result != true) throw error_msg("operator>=", n2, n2, result); }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // combination
    num_tests++;
    n4 = (n1 - n2) * n3 + n1;
    try {
        if (static_cast<double>(n4) != ExactNumber(-17, 36))
            throw error_msg("(n1 - n2) * n3 + n1", n4, -17.0 / 36.0);
    }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = n1 * n1 / n1 / n1;
    try {
        if (static_cast<double>(n4) != ExactNumber(1, 1))
            throw error_msg("n1 * n1 / n1 / n1", n4, 1.0 / 1.0);
    }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = n1 * n3 / n2 + n3 / n1 * n2;
    try {
        if (static_cast<double>(n4) != ExactNumber(109, 36))
            throw error_msg("n1 * n3 / n2 + n3 / n1 * n2", n4, 109.0 / 36.0);
    }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    num_tests++;
    n4 = (n1 + n2) / (n3 * (n1 - n2) / (n3 + n1 * n2));
    try {
        if (static_cast<double>(n4) != ExactNumber(-26, 7))
            throw error_msg("(n1 + n2) / (n3 * (n1 - n2) / (n3 + n1 * n2))", n4, -26.0 / 7.0);
    }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // operator* involving 0
    ExactNumber n5(11, 3), n6(0, 5);
    num_tests++;
    n4 = n5 * n6;
    try {
        if (static_cast<double>(n4) != ExactNumber(0, 1))
            throw error_msg("operator* involving 0", n4, 0.0 / 1.0);
    }
    catch (string m) {
        cout << m << endl;
        num_failed++;
    }

    // operator/ involving 0
    num_tests++;
    try {
        n4 = n5 / n6;
        if (static_cast<double>(n4) != ExactNumber(1, 0))
            throw error_msg("operator/ involving 0", n4, 0.0 / 1.0);
    }
    catch (const exception& m) {
        cout << m.what() << endl;
    }

    /* Do not modify the code below */
    if (num_failed == 0) {
        cout << "passed all " << num_tests << " default test cases" << endl;
    } else {
        cout << "failed " << num_failed << " default test cases out of " << num_tests << " default test cases" << endl;
    }
    cout << endl;

    num_tests = 0;
    ExactNumber one(1, 1), two(2, 1), negative_one_point_five(-3, 2), zero(0, 1), three_point_five(7, 2), one_again(2,
                                                                                                                    2), fdiv_test_case(
            4195835, 3145727);

    // 1. FDIV bug check
    num_tests++;
    try {
        if (static_cast<double>(fdiv_test_case) != (4195835.0 / 3145727.0))
            throw runtime_error("FDIV bug check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 2. Test: Equal
    num_tests++;
    try {
        if (!(one == one_again))
            throw runtime_error("Equality check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 3. Test: Not Equal
    num_tests++;
    try {
        if (one != one)
            throw runtime_error("Inequality check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 4. Test: Greater Than
    num_tests++;
    try {
        if (!(two > one))
            throw runtime_error("Greater than check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 5. Test: Less Than
    num_tests++;
    try {
        if (!(negative_one_point_five < one))
            throw runtime_error("Less than check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 6. Test: Greater Than or Equal
    num_tests++;
    try {
        if (!(two >= one))
            throw runtime_error("Greater than or equal check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 7. Test: Less Than or Equal
    num_tests++;
    try {
        if (!(negative_one_point_five <= one))
            throw runtime_error("Less than or equal check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 8. Test: Addition
    ExactNumber sum = one + two;
    num_tests++;
    try {
        if (static_cast<double>(sum) != 3.0)
            throw runtime_error("Addition check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 9. Test: Subtraction
    ExactNumber difference = two - one;
    num_tests++;
    try {
        if (static_cast<double>(difference) != 1.0)
            throw runtime_error("Subtraction check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 10. Test: Multiplication
    ExactNumber product = two * negative_one_point_five;
    num_tests++;
    try {
        if (static_cast<double>(product) != -3.0)
            throw runtime_error("Multiplication check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 11. Test: Division
    ExactNumber quotient = two / one;
    num_tests++;
    try {
        if (static_cast<double>(quotient) != 2.0)
            throw runtime_error("Division check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 12. Edge Case: Division by Zero
    num_tests++;
    try {
        ExactNumber div_by_zero_result = one / zero;
        throw runtime_error("Division by zero check failed (expected exception).");
    } catch (const exception &e) {
        cout << "Caught division by zero as expected (skipping)" << endl;
    }

    // 13. Addition with Negative
    ExactNumber addition_with_negative = negative_one_point_five + one;
    num_tests++;
    try {
        if (static_cast<double>(addition_with_negative) != -0.5)
            throw runtime_error("Addition with negative check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 14. Subtraction with Negative
    ExactNumber subtraction_with_negative = one - negative_one_point_five;
    num_tests++;
    try {
        if (static_cast<double>(subtraction_with_negative) != 2.5)
            throw runtime_error("Subtraction with negative check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 15. Negative Multiplication
    ExactNumber negative_product = negative_one_point_five * negative_one_point_five;
    num_tests++;
    try {
        if (static_cast<double>(negative_product) != 2.25)
            throw runtime_error("Negative multiplication check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 16. Negative Division
    ExactNumber negative_division = negative_one_point_five / two;
    num_tests++;
    try {
        if (static_cast<double>(negative_division) != -0.75)
            throw runtime_error("Negative division check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 17. Multiplication by Zero
    ExactNumber multiplication_by_zero = zero * two;
    num_tests++;
    try {
        if (static_cast<double>(multiplication_by_zero) != 0.0)
            throw runtime_error("Multiplication by zero check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 18. Self Assignment
    num_tests++;
    try {
        if (static_cast<double>(one) != 1.0)
            throw runtime_error("Self-assignment check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 19. Negative Self Multiplication
    ExactNumber negative_self_multiplication = negative_one_point_five * ExactNumber(-1, 1);
    num_tests++;
    try {
        if (static_cast<double>(negative_self_multiplication) != 1.5)
            throw runtime_error("Negative self-multiplication check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    // 20. Fraction Reduction Check
    ExactNumber fraction_reduction(10, 20);
    num_tests++;
    try {
        if (static_cast<double>(fraction_reduction) != 0.5)
            throw runtime_error("Fraction reduction check failed.");
    } catch (const exception &e) {
        cout << e.what() << endl;
        num_failed++;
    }

    if (!num_failed) {
        cout << "passed all " << num_tests << " custom test cases" << endl;
    } else {
        cout << "failed " << num_failed << " custom test cases out of " << num_tests << " custom test cases" << endl;
    }
    cout << endl;

    return 0;
}