1 files changed, 66 insertions, 0 deletions
diff --git a/aoc2023-gleam/src/day2/solve.gleam b/aoc2023-gleam/src/day2/solve.gleam
new file mode 100644
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--- /dev/null
+++ b/aoc2023-gleam/src/day2/solve.gleam
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+import adglent.{First, Second}
+import gleam/io
+import gleam/int
+import gleam/string
+import gleam/list
+
+pub type Game {
+  Game(red: Int, blue: Int, green: Int)
+}
+
+fn parse(input: String) -> List(List(Game)) {
+  use line <- list.map(string.split(input, "\n"))
+  let assert [_, rounds] = string.split(line, on: ": ")
+  use match <- list.map(string.split(rounds, on: "; "))
+  use acc, draw <- list.fold(
+    over: string.split(match, on: ", "),
+    from: Game(0, 0, 0),
+  )
+  let assert Ok(#(n_str, color)) = string.split_once(draw, " ")
+  let assert Ok(n) = int.parse(n_str)
+  case color {
+    "red" -> Game(..acc, red: n)
+    "blue" -> Game(..acc, blue: n)
+    "green" -> Game(..acc, green: n)
+    _ -> panic as "unrecognized color"
+  }
+}
+
+pub fn part1(input: String) {
+  use acc, game, i <- list.index_fold(parse(input), 0)
+  case list.any(game, fn(m) { m.red > 12 || m.green > 13 || m.blue > 14 }) {
+    False -> acc + i + 1
+    True -> acc
+  }
+}
+
+pub fn part2(input: String) {
+  {
+    use game <- list.map(parse(input))
+    use acc, match <- list.fold(game, Game(0, 0, 0))
+    let Game(red: red, green: green, blue: blue) = match
+    Game(
+      red: int.max(red, acc.red),
+      blue: int.max(blue, acc.blue),
+      green: int.max(green, acc.green),
+    )
+  }
+  |> list.fold(from: 0, with: fn(acc, g: Game) {
+    acc + g.red * g.blue * g.green
+  })
+}
+
+pub fn main() {
+  let assert Ok(part) = adglent.get_part()
+  let assert Ok(input) = adglent.get_input("2")
+  case part {
+    First ->
+      part1(input)
+      |> adglent.inspect
+      |> io.println
+    Second ->
+      part2(input)
+      |> adglent.inspect
+      |> io.println
+  }
+}