open Types
open Angstrom
open Parsers

let is_sep = function '\x20' | '\x09' -> true | _ -> false
let is_delim = function '\x0a' | '\x0d' -> true | _ -> false
let is_text c = not (is_sep c || is_delim c || c = '\x1b')
let sep = take_while is_sep >>| fun s -> Separator s
let delim = take_while is_delim >>| fun s -> Delimiter s
let text = take_while is_text >>| fun s -> Text s
let ansi = Ansi.ansi_parse

let culr_parse =
  peek_char_fail >>= function
  | n when is_sep n -> sep
  | n when is_delim n -> delim
  | n when n = '\x1b' -> ansi
  | _n -> text

let conv_rgb = function [ r; g; b ] -> Types.RGB (r, g, b) | _ -> assert false
let hex_digit = take 2 >>| fun s -> int_of_string ("0x" ^ s)

let rgb_triple =
  let digit_comma = digit <* char ',' in
  char '(' *> list [ digit_comma; digit_comma; digit ] <* char ')' >>| conv_rgb

let hex_colour = char '#' *> count 3 hex_digit >>| conv_rgb
let simple_colour = digit >>| fun s -> Types.Simple s
let env_colours = sep_by1 skip_semi (rgb_triple <|> hex_colour <|> simple_colour)
let unpack = function Ok payload -> payload | _ -> []

let parse_env_colours s =
  parse_string ~consume:Consume.All env_colours s |> unpack |> Array.of_list

let parse_env_order s =
  parse_string ~consume:Consume.All Parsers.semi_digits s
  |> unpack |> Array.of_list

let%test "sep_parse" =
  parse_string ~consume:Consume.All sep "        " |> function
  | Ok (Separator "        ") -> true
  | _ -> false

let%test "delim_parse" =
  parse_string ~consume:Consume.All delim "\n\n\n" |> function
  | Ok (Delimiter "\n\n\n") -> true
  | _ -> false

let%test "text_parse" =
  parse_string ~consume:Consume.All text "okokyeahok" |> function
  | Ok (Text "okokyeahok") -> true
  | _ -> false

let%test "culr_parse" =
  parse_string ~consume:Consume.All (many1 culr_parse)
    "sometext   \n\n\n    \x1b[38;2;2m"
  |> function
  | Ok
      [
        Text "sometext";
        Separator "   ";
        Delimiter "\n\n\n";
        Separator "    ";
        Ansi [ Fg (Simple 2) ];
      ] ->
      true
  | Ok n ->
      n |> List.fold_left (fun _acc el -> el |> Debug.debug_print) ();
      false
  | _ -> false

let%test "rgb" =
  parse_string ~consume:Consume.All rgb_triple "(255,0,127)" |> function
  | Ok s -> s = Types.RGB (255, 0, 127)
  | _ -> false

let%test "hex" =
  parse_string ~consume:Consume.All hex_colour "#FF007F" |> function
  | Ok s -> s = Types.RGB (255, 0, 127)
  | _ -> false