const std = @import("std");
const info = std.log.info;
const vec = @import("./vec.zig");
const Vec3 = vec.Vec3;
const Color = vec.Color;
const write_color = @import("./color.zig").write_color;

pub fn main() anyerror!void {
    const image_width: isize = 256;
    const image_height: isize = 256;

    const stdout = std.io.getStdOut();

    info("Writing image {d}x{d}\n", .{ image_width, image_height });
    try stdout.writer().print("P3\n{d} {d}\n255\n", .{ image_width, image_height });

    var j: isize = image_height - 1;
    while (j >= 0) : (j -= 1) {
        info("Scanlines remaining: {d}", .{j});

        var i: isize = 0;
        while (i < image_width) : (i += 1) {
            const pixel_color = Color.init(@intToFloat(f32, i) / @intToFloat(f32, image_width - 1), @intToFloat(f32, j) / @intToFloat(f32, image_height - 1), 0.25);
            try write_color(pixel_color);
        }
    }
}

test "basic test" {
    try std.testing.expectEqual(10, 3 + 7);
}