%% BM20A5001 Principles of Technical Computing
%  Matylda Jablonska-Sabuka
%  Exercise list 4, Task 4

clc
clear all
close all


% ask for the car class
fprintf('Which car class would you like to rent?\n')
fprintf('B - economy\n')
fprintf('C - family\n')
fprintf('D - luxury\n')
c = input('Choose the class: ','s');
% the 's' at the end of input function tells Matlab to trear whatever input
% as a string

% If the entered class type is completely wrong
while c~='B'&c~='C'&c~='D'
    % inform the user and ask for the class again:
    fprintf('Class %s does not exist in our selection.\n',c)
    fprintf('Choose one of the available classes:\n')
    fprintf('B - economy\n')
    fprintf('C - family\n')
    fprintf('D - luxury\n')
    c = input('Choose the class: ','s');
end

% ask for the rental period
p = input('For how many days would you like to rent the car? ');
% option variable o will be used later
o = 1;

% looping for correct input from the user
% as long as the user puts in too long rental period or class D with too
% short period
while p>60 | (p<7 & c=='D')
    % if the rental period is too long
    if p>60
        % inform the user and ask for input again
        p = input('Rental for over 60 days is not possible.\nInsert the period again: ');
    % otherwise it means that the class+rental period combination was not
    % right, so we ask the user what he wants to do:
    else
        fprintf('\nClass D cannot be rented for less than 7 days.\n')
        fprintf('Would you like to:\n')
        fprintf('- Change the car class (choose c)\n')
        fprintf('- Change the rental period (choose p)\n')
        fprintf('- Quit (choose q)\n')
        o = input('\nChoose the option: ','s');
        if o == 'c'
            c = input('\nWhich car class would you like to rent? ','s');
        elseif o == 'p'
            p = input('\nFor how many days would you like to rent the car? ');
        elseif o == 'q'
            fprintf('\nThank you for using our service. Goodbye!\n');
            break
        else
            while o ~= 'c' | o ~= 'p'
                fprintf('\nWrong option.\n')
                o = input('Choose the option again: ','s');
            end
        end
    end
end

if o ~='q'

    % define the rental price components
    d = [27 25 23
        34 31 28
        0  43 38];

    period = [162 662
            204 884
            276 1136];
    t1 = 7;
    t2 = 28;

    if p<t1 & c == 'B'
        rental = p*d(1,1);
    elseif p<t1 & c =='C'
        rental = p*d(2,1);
    elseif p<t2 & c == 'B'
        rental = period(1,1) + (p-t1)*d(1,2);
    elseif p<t2 & c == 'C'
        rental = period(2,1) + (p-t1)*d(2,2);
    elseif p<t2 & c == 'D'
        rental = period(3,1) + (p-t1)*d(3,2);
    elseif p>=t2 & c == 'B'
        rental = period(1,2) + (p-t2)*d(1,3);
    elseif p>=t2 & c == 'C'
        rental = period(2,2) + (p-t2)*d(2,3);
    elseif p>=t2 & c == 'D'
        rental = period(3,2) + (p-t2)*d(3,3);
    end

    fprintf('\nThe rental of class %s for %d day(s) will cost %d euros.\n',c,p,rental)

end