type head_data = { page_title : string }

type body_data = {
  title : string Lwt.t;
  subtitle : string;
  topnav : Dream_html.node;
  content : Dream_html.node list;
}

module Layout = struct
  open Dream_html
  open HTML

  let header title subtitle =
    null [ h1 [] [ txt "%s" title ]; h2 [] [ txt "%s" subtitle ] ]

  let footer =
    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 [ "Copyright"; year; Config.author ]
    in
    footer [] [ txt "%s" footer_text ]

  let head_data = { page_title = "Ogit" }

  let application ?(head_data = head_data) body_data =
    html []
      [
        head []
          [
            title [] "%s" head_data.page_title;
            link [ rel "stylesheet"; href "/static/styles.css" ];
          ];
        body []
          [
            header "Ogit" body_data.subtitle;
            body_data.topnav;
            div [ id "main" ] body_data.content;
            footer;
          ];
      ]
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 body_data =
    {
      title = Lwt.return "My repositories";
      subtitle = "Repositories for " ^ Config.author;
      topnav = null [];
      content = [ repositories_in Config.git_directory ];
    }

  let render () = Lwt.return @@ Layout.application body_data
end

module Repo_root = struct
  open Dream_html
  open HTML

  let topnav =
    nav
      [ id "top" ]
      [
        ul []
          [
            li [] [ a [ href "/" ] [ txt "summary" ] ];
            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 render repo_name =
    let title = Git_helpers.get_head_commit_hash repo_name in
    let subtitle = "Repository" in
    let content = [ null [] ] in
    let body_data = { title; subtitle; topnav; content } in
    Lwt.return @@ Layout.application body_data
end

module Repo_tree = struct
  open Dream_html
  open HTML

  let render repo_name =
    let title = repo_name and content = [ txt "foobar" ] in
    let subtitle = "Dinglefops" in
    let topnav = null [] in
    let body_data = { title; subtitle; topnav; content } in
    Lwt.return @@ Layout.application body_data
end