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const std = @import("std");
const Result = @import("util/aoc.zig").Result;
const Hand = enum(u8) { Rock = 1, Paper = 2, Scissors = 3 };
const Outcome = enum(u8) { Win = 6, Draw = 3, Lose = 0 };
const KV_Hand = struct { @"0": []const u8, @"1": Hand };
const KV_Outcome = struct { @"0": []const u8, @"1": Outcome };
const Player_A_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
.{ .@"0" = "A", .@"1" = .Rock },
.{ .@"0" = "B", .@"1" = .Paper },
.{ .@"0" = "C", .@"1" = .Scissors },
});
const Player_B_KV = std.ComptimeStringMap(Hand, [_]KV_Hand{
.{ .@"0" = "X", .@"1" = .Rock },
.{ .@"0" = "Y", .@"1" = .Paper },
.{ .@"0" = "Z", .@"1" = .Scissors },
});
const Outcome_KV = std.ComptimeStringMap(Outcome, [_]KV_Outcome{
.{ .@"0" = "X", .@"1" = .Lose },
.{ .@"0" = "Y", .@"1" = .Draw },
.{ .@"0" = "Z", .@"1" = .Win },
});
const match_impl = struct {
fn puzzle_1(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),
}
},
}
}
fn puzzle_2(a: Hand, b: Outcome) u8 {
switch (a) {
.Rock => {
switch (b) {
.Win => return @enumToInt(b) + @enumToInt(Hand.Paper),
.Lose => return @enumToInt(b) + @enumToInt(Hand.Scissors),
.Draw => return @enumToInt(b) + @enumToInt(Hand.Rock),
}
},
.Paper => {
switch (b) {
.Win => return @enumToInt(b) + @enumToInt(Hand.Scissors),
.Lose => return @enumToInt(b) + @enumToInt(Hand.Rock),
.Draw => return @enumToInt(b) + @enumToInt(Hand.Paper),
}
},
.Scissors => {
switch (b) {
.Win => return @enumToInt(b) + @enumToInt(Hand.Rock),
.Lose => return @enumToInt(b) + @enumToInt(Hand.Paper),
.Draw => return @enumToInt(b) + @enumToInt(Hand.Scissors),
}
},
}
}
};
pub fn puzzle_1(input: []const u8) Result {
var iter = std.mem.split(u8, input, "\n");
var score: u16 = 0;
while (iter.next()) |line| {
score += match_impl.puzzle_1(
Player_A_KV.get(&[_]u8{line[0]}).?,
Player_B_KV.get(&[_]u8{line[2]}).?,
);
}
return .{ .int = score };
}
pub fn puzzle_2(input: []const u8) Result {
var iter = std.mem.split(u8, input, "\n");
var score: u16 = 0;
while (iter.next()) |line| {
score += match_impl.puzzle_2(
Player_A_KV.get(&[_]u8{line[0]}).?,
Outcome_KV.get(&[_]u8{line[2]}).?,
);
}
return .{ .int = score };
}
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