type page_data = { title : string; main_content : Dream_html.node list }

module Layout = struct
  open Dream_html
  open HTML

  let header =
    null
      [
        h1 [] [ txt "ogit" ];
        h2 [] [ txt "A mobile-friendly Git repository viewer" ];
      ]

  let topnav =
    nav
      [ id "top" ]
      [
        ul []
          [
            li [] [ a [ href "/" ] [ txt "Home" ] ];
            li [] [ a [ href "/" ] [ txt "Refs" ] ];
            li [] [ a [ href "/" ] [ txt "Log" ] ];
            li [] [ a [ href "/" ] [ txt "Tree" ] ];
            li [] [ a [ href "/" ] [ txt "Commit" ] ];
            li [] [ a [ href "/" ] [ txt "Diff" ] ];
          ];
      ]

  let footer name =
    let today = Unix.localtime (Unix.time ()) in
    let year = today.Unix.tm_year + 1900 |> string_of_int in
    let space = " " in
    let footer_text = String.concat space [ "©"; year; name ] in
    footer [] [ txt "%s" footer_text ]

  let application page =
    html []
      [
        head [] [ title [] "%s" page.title ];
        link [ rel "stylesheet"; href "/static/styles.css" ];
        body []
          [
            header;
            topnav;
            div [ id "main" ] page.main_content;
            footer "Marius PETER";
          ];
      ]
end

module Ogit_root = struct
  open Dream_html
  open HTML

  let repositories_in directory =
    let repositories = Sys.readdir directory |> Array.to_list
    and li_of_repo repo = li [] [ a [ href "%s" repo ] [ txt "%s" repo ] ] in
    div [ id "repositories" ] [ ul [] @@ List.map li_of_repo repositories ]

  let page_data =
    {
      title = "My repositories";
      main_content = [ repositories_in Config.git_directory ];
    }

  let render () = Layout.application page_data
end

module Repo_root = struct
  open Dream_html
  open HTML
  open Git
  open Lwt.Infix

  let page_promise repo_name =
    let repo_path = Filename.concat Config.git_directory repo_name in

    (* 1. Open the Git repository *)
    let%lwt repo =
      Git_unix.Store.v (Fpath.v repo_path) >>= function
      | Ok repo -> Lwt.return repo
      | Error _ -> Lwt.fail_with "Could not open the Git repository."
    in

    (* 2. Resolve HEAD to get the latest commit hash *)
    let%lwt commit_hash =
      Git_unix.Store.Ref.resolve repo Reference.head >>= function
      | Ok hash -> Lwt.return hash
      | Error _ -> Lwt.fail_with "Failed to resolve HEAD"
    in

    (* (\* 3. Read the commit *\) *)
    (* let%lwt commit =  *)
    (*   Commit.v repo commit_hash >>= function *)
    (*   | Ok commit -> Lwt.return commit *)
    (*   | Error _ -> Lwt.fail_with "Failed to read the commit." *)
    (* in *)

    (* (\* 4. Read the tree from the commit *\) *)
    (* let%lwt tree = *)
    (*   Tree.v commit.Commit.tree >>= function *)
    (*   | Ok tree -> Lwt.return tree *)
    (*   | Error _ -> Lwt.fail_with "Failed to read the tree." *)
    (* in *)

    (* (\* 5. Generate HTML list items for each tree entry *\) *)
    (* let entries = Tree.entries tree in *)
    (* let items = *)
    (*   List.map *)
    (*     (fun entry -> *)
    (*       let icon = match entry.Tree.perm with `Dir -> "📁 " | _ -> "📄 " in *)
    (*       li [] [ a [ href "#" ] [ txt (icon ^ entry.Tree.name) ] ]) *)
    (*     entries *)
    (* in *)

    (* 6. Assemble the page *)
    let main_content =
      [
        ul []
          [ li [] [ txt "%s" (commit_hash |> Digestif.SHA1.to_raw_string) ] ];
      ]
    in
    let page_data = { title = repo_name; main_content } in
    Lwt.return (Layout.application page_data)

  let render repo_name = page_promise repo_name >>= fun page -> Lwt.return page
end

module Repo_tree = struct
  open Dream_html

  let render repo_name =
    let title = repo_name and main_content = [ txt "foobar" ] in
    let page_data = { title; main_content } in
    Layout.application page_data
end