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const std = @import("std");
const slurp = @import("util/file.zig").slurp;
var gpa = std.heap.GeneralPurposeAllocator(.{}){};
const allocator = gpa.allocator();
const Hand = enum(u8) { Rock = 1, Paper = 2, Scissors = 3 };
const Outcome = enum(u8) { Win = 6, Draw = 3, Lose = 0 };
const KV = struct { @"0": []const u8, @"1": Hand };
const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV{
.{ .@"0" = "A", .@"1" = .Rock },
.{ .@"0" = "B", .@"1" = .Paper },
.{ .@"0" = "C", .@"1" = .Scissors },
});
const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV{
.{ .@"0" = "X", .@"1" = .Rock },
.{ .@"0" = "Y", .@"1" = .Paper },
.{ .@"0" = "Z", .@"1" = .Scissors },
});
pub fn main() !void {
const file_buffer = try slurp(allocator, "./input");
defer allocator.free(file_buffer);
var iter = std.mem.split(u8, file_buffer, "\n");
var score: u16 = 0;
while (iter.next()) |line| {
if (line.len > 0) {
score += match(
Player_A_KV.get(&[_]u8{line[0]}).?,
Player_B_KV.get(&[_]u8{line[2]}).?,
);
}
}
std.debug.print("{d}\n", .{score});
}
fn match(a: Hand, b: Hand) u8 {
switch (b) {
.Rock => {
switch (a) {
.Rock => return @enumToInt(b) + @enumToInt(Outcome.Draw),
.Paper => return @enumToInt(b) + @enumToInt(Outcome.Lose),
.Scissors => return @enumToInt(b) + @enumToInt(Outcome.Win),
}
},
.Paper => {
switch (a) {
.Rock => return @enumToInt(b) + @enumToInt(Outcome.Win),
.Paper => return @enumToInt(b) + @enumToInt(Outcome.Draw),
.Scissors => return @enumToInt(b) + @enumToInt(Outcome.Lose),
}
},
.Scissors => {
switch (a) {
.Rock => return @enumToInt(b) + @enumToInt(Outcome.Lose),
.Paper => return @enumToInt(b) + @enumToInt(Outcome.Win),
.Scissors => return @enumToInt(b) + @enumToInt(Outcome.Draw),
}
},
}
}
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