let env_log_level =
  match Sys.getenv_opt "LOG_LEVEL" with
  | None ->
      Some Logs.Warning
  | Some lvl -> (
    match Logs.level_of_string lvl with Error _ -> None | Ok v -> v )

let run_solver name solver filepath =
  let content = Shared.File.read filepath in
  match solver content () with
  | Error msg ->
      Logs.app (fun m -> m "[%s] Err=%s" name msg)
  | Ok answer ->
      Logs.app (fun m -> m "[%s] ANSWER=%d" name answer)

let run_day _ = function
  | 1 ->
      let filepath = "../.input/2025/day_01.txt" in
      run_solver "D01P01" Year2025.Day01.Part01.Solver.solve filepath ;
      run_solver "D01P02" Year2025.Day01.Part02.Solver.solve filepath ;
      0
  | 2 ->
      let filepath = "../.input/2025/day_02.txt" in
      run_solver "D02P01" Year2025.Day02.Part01.Solver.solve filepath ;
      run_solver "D02P02" Year2025.Day02.Part02.Solver.solve filepath ;
      0
  | 3 ->
      let filepath = "../.input/2025/day_03.txt" in
      run_solver "D03P01" Year2025.Day03.Part01.Solver.solve filepath ;
      run_solver "D03P02" Year2025.Day03.Part02.Solver.solve filepath ;
      0
  | 4 ->
      let filepath = "../.input/2025/day_04.txt" in
      run_solver "D04P01" Year2025.Day04.Part01.Solver.solve filepath ;
      run_solver "D04P02" Year2025.Day04.Part02.Solver.solve filepath ;
      0
  | 6 ->
      let filepath = "../.input/2025/day_06.txt" in
      run_solver "D06P01" Year2025.Day06.Part01.Solver.solve filepath ;
      run_solver "D06P02" Year2025.Day06.Part02.Solver.solve filepath ;
      0
  | _ ->
      failwith "day not implemented"

(* Command line interface *)

open Cmdliner

let setup_log style_renderer = Fmt_tty.setup_std_outputs ?style_renderer ()

let setup_log_t = Term.(const setup_log $ Fmt_cli.style_renderer ())

let day_arg =
  let doc = "Day to run. MUST be in range of 1-12." in
  Arg.(value & pos 0 int 1 & info [] ~docv:"DAY" ~doc)

let day_t = Term.(const run_day $ setup_log_t $ day_arg)

let cmd =
  let info = Cmd.info "aoc" ~version:"0.1.0" in
  Cmd.v info day_t

let run () = Cmd.eval' cmd

let main () =
  let log_level = env_log_level in
  Logs.set_level log_level ;
  Logs.set_reporter (Logs_fmt.reporter ()) ;
  Logs.info (fun m ->
      m "Started application with LOG_LEVEL=%s" (Logs.level_to_string log_level) ) ;
  run ()

let () = if !Sys.interactive then () else exit (main ())