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module Grep = Grep
module Common = Common
open Notty
module Input_screen = Input_screen

type state =
  { tag : string option
  ; pos : int * int
  ; scroll : int
  ; content : (string * string) array
  ; content_pretty : string array
  }

let rec headline_screen t ({ tag; pos; scroll; content; content_pretty } as state) =
  print_endline (Option.value ~default:"No tag" tag);
  let x, y = pos in
  let img =
    let dot = I.string A.(st bold) ">" |> I.pad ~l:0 ~t:(y - scroll)
    and elements =
      Array.mapi
        (fun i el ->
          if i == y - scroll
          then I.strf ~attr:A.(st underline) "%s" el |> I.pad ~l:2 ~t:i
          else I.strf "%s" el |> I.pad ~l:2 ~t:i)
        (Array.to_seq content_pretty |> Seq.drop scroll |> Array.of_seq)
    in
    let open I in
    Array.fold_left (fun sum el -> el </> sum) dot elements
  in
  let _, size_y = Common.Term.size t in
  Common.Term.image t img;
  let content_length = Array.length content_pretty in
  let scroll_up () =
    let scroll = if y - scroll = 0 then max (scroll - 1) 0 else scroll in
    headline_screen t @@ { state with pos = x, max (y - 1) 0; scroll }
  in
  let scroll_down () =
    let scroll = if y - scroll >= size_y - 1 then scroll + 1 else scroll in
    headline_screen t @@ { state with pos = x, min (y + 1) (content_length - 1); scroll }
  in
  match Common.Term.event t with
  | `End | `Key (`Escape, []) | `Key (`ASCII 'q', []) | `Key (`ASCII 'C', [ `Ctrl ]) -> ()
  | `Mouse (`Press (`Scroll s), _, _) ->
    (match s with
     | `Down -> scroll_down ()
     | `Up -> scroll_up ())
  | `Resize _ -> headline_screen t state
  | `Mouse ((`Press _ | `Drag), (_, y), _) ->
    headline_screen t { state with pos = 0, min y content_length }
  | `Key (`ASCII 't', []) ->
    let (input_state : Input_screen.state) =
      { screen = img
      ; user_input = ""
      ; prompt = "TAG: "
      ; on_enter =
          (fun tag ->
            let content = Grep.get_tagged_headlines tag () |> Grep.parse_headlines in
            let content_pretty = Grep.pretty_format content in
            Common.Term.cursor t None;
            headline_screen
              t
              { state with content; content_pretty; pos = 0, 0; scroll = 0 })
      ; on_cancel =
          (fun _ ->
            Common.Term.cursor t None;
            headline_screen t state)
      }
    in
    Input_screen.render t input_state
  | `Key (`ASCII 's', []) ->
    let (input_state : Input_screen.state) =
      { screen = img
      ; user_input = ""
      ; prompt = "SEARCH: "
      ; on_enter =
          (fun _ ->
            Common.Term.cursor t None;
            headline_screen t { state with pos = 0, 0; scroll = 0 })
      ; on_cancel =
          (fun _ ->
            Common.Term.cursor t None;
            headline_screen t state)
      }
    in
    Input_screen.render t input_state
  | `Key (`ASCII 'j', []) | `Key (`ASCII 'N', [ `Ctrl ]) -> scroll_down ()
  | `Key (`ASCII 'k', []) | `Key (`ASCII 'P', [ `Ctrl ]) -> scroll_up ()
  | `Key (`Arrow d, _) ->
    (match d with
     | `Up -> scroll_up ()
     | `Down -> scroll_down ()
     | _ -> headline_screen t state)
  | `Key (`ASCII 'e', []) | `Key (`Enter, []) ->
    (* Editor might be set with extra args, in that case we need to separate these *)
    let[@warning "-8"] (editor :: args) =
      String.split_on_char ' ' (Sys.getenv "EDITOR")
    in
    let selected_file, _ = Array.get content y in
    let full_path_file = Grep.execution_directory ^ "/" ^ selected_file in
    let full_args = Array.append (Array.of_list args) [| full_path_file |] in
    Common.Term.cursor t (Some (0, 0));
    let _ =
      Unix.create_process_env
        editor
        full_args
        (Unix.environment ())
        Unix.stdin
        Unix.stdout
        Unix.stderr
    in
    let rec run_editor () =
      match Unix.wait () with
      | _, _ ->
        Common.Term.cursor t None;
        headline_screen t state
      (* Capture resizing events *)
      | exception Unix.Unix_error (Unix.EINTR, _, _) -> run_editor ()
      | exception Unix.Unix_error (_, _, _) -> failwith "ERROR"
    in
    run_editor ()
  | _ -> headline_screen t state


let start (tag : string) () =
  let tag = if String.equal tag "" then None else Some tag in
  let content =
    match tag with
    | None -> Grep.get_headlines () |> Grep.parse_headlines
    | Some tag -> Grep.get_tagged_headlines tag () |> Grep.parse_headlines
  in
  if Array.length content == 0
  then (
    print_endline "No entry for tag";
    exit 0)
  else (
    let content_pretty = content |> Grep.pretty_format in
    headline_screen
      (Common.Term.create ())
      { tag; pos = 0, 0; scroll = 0; content; content_pretty })