const std = @import("std");
const writer = std.io.getStdOut().writer();


const Timestamp = struct {
    hours: u64,
    minutes: u64,
};

const testees:[]const []const u8 = &[_][] const u8 {
    "1",
    "2",
    "3",
    "4",
    "5",
    "6",
    "7",
    "8"
};

const number_of_testees: u64 = testees.len;     // len von testees
const total_minutes: u64 = 60;                  // Gesamte Dauer in min
const pause_minutes: u64 = 2;                   // Länge der Pause zwischen 2 Testaten


pub fn main () !void {

    var testStamp = Timestamp {
        .hours = 13,
        .minutes = 5,
    };
    
    try writer.print("Amount tests: {d} \n\n", .{number_of_testees});
    
    try printTimestamp(&testStamp);
    try writer.print("\n", .{});
    try printPlan();

    try addMinutesToTimestamp(&testStamp, 175);
    try printTimestamp(&testStamp);
}

// Printet timestamp im Format HH:MM
pub fn printTimestamp(ts: *Timestamp) !void {

    try writer.print("{0d:0>2}:{1d:0>2}", .{ ts.hours, ts.minutes });
}

pub fn addMinutesToTimestamp(ts: *Timestamp, min: u16) !void{

    var addHours: u64 = min / 60;
    var addMinutes: u64 = min%60;


    if ((addMinutes + ts.minutes) >= 60){
        addMinutes = (addMinutes + ts.minutes)%60;
        addHours += 1;
        ts.minutes = 0;
    }

    ts.hours += addHours;
    ts.minutes += addMinutes;

}

pub fn printPlan() !void {

    const rand = std.crypto.random;
    
    const noneNumber:u64 = number_of_testees+1;
    
    var testees_order: [number_of_testees]u8 = undefined;
    
    // Fill order array with noneNumber
    for (testees_order, 0..) |_, index| {
        testees_order[index] = noneNumber;
    }
    
    
    // Fill order array with a random order
    for (testees, 0..) |_, blockIndex| {
        while(true) {
            const randIndex:u8 = rand.intRangeLessThan(u8, 0, number_of_testees);

            if (arrayContains(&testees_order, randIndex)) {
                continue;
            }
            testees_order[blockIndex] = randIndex;
            break;
        }
    }
    
    for (testees_order, 0..) |elem, index| {
        try writer.print("Nr.{d}: {s} \n", .{index, testees[elem]});
    }
}

pub fn arrayContains(arr: []u8, q: i64) bool {
    for (arr) |element| {
        if (element == q) {
            return true;
        }
    }
    return false;
}