const std = @import("std");


pub fn main() !void {
    const rand = std.crypto.random;
    const reader = std.io.getStdIn().reader();
    const writer = std.io.getStdOut().writer();

    try writer.print("Welcome to my number guessing game! \n", .{});

    try writer.print("Enter an upper limit\n", .{});
    const upperLimit = oneIntInput(writer, reader);
    try writer.print("Your upper limit is {d}! \n", .{upperLimit});

    for (0..10) |i| {
        const randomInt = rand.intRangeLessThan(u16, 0, 3);
        try writer.print("Random number {d}: {d} \n\n", .{i, randomInt});
    }

}

pub fn oneIntInput(writer: anytype, reader: anytype) !i64 {
    var buffer: [256]u8 = undefined;

    while (true) {
        try writer.print("> ", .{});
        const amountInputBytes = try reader.read(&buffer);
        const input_slice: []u8 = buffer[0..(amountInputBytes - 1)];

        const result: i64 = std.fmt.parseInt(i64, input_slice, 10) catch |err| {
            switch (err) {
                error.InvalidCharacter => {
                    try writer.print("Error: Invalid character, try again! \n", .{});
                },
                error.Overflow => {
                    try writer.print("Error: Too big for an i64, try again! \n", .{});
                },
            }
            try writer.print("\n", .{});
            continue;
        };
        return result;
    }
}