let version = "%%VERSION%%"

open Cmdliner
open Logarion
module A = Logarion.Archive.Make(File_store)

(* TODO: merge in lib/ so other modules can use (.e.g HTTP pull) *)
let text_list order_opt reverse_opt number_opt values_opt authors_opt topics_opt =
	match A.of_path (Sys.getcwd ()) with
	| Error msg -> prerr_endline msg
	| Ok archive ->
		let predicates = A.predicate A.authored authors_opt @ A.predicate A.topics topics_opt in
		let predicate text = List.fold_left (fun a e -> a && e text) true predicates in
		let print_fold ~predicate fn =
			let ts = A.fold ~predicate fn String_set.empty archive in
			String_set.iter (print_endline) ts
		in
		let list_text (t, fname) = print_endline (Text.short_id t ^ " " ^ t.Text.title ^ "\t" ^ fname) in
		match values_opt with
		| Some "topics" -> print_fold ~predicate (fun a (e,_) -> (String_set.union a (Text.set "topics" e)))
		| Some "authors" ->
				let s = A.fold ~predicate (fun a (e,_) -> Person.Set.union a e.Text.authors) Person.Set.empty archive in
				print_endline @@ Person.Set.to_string s
		| Some x -> prerr_endline @@ "Unrecognised field: " ^ x
		| None -> match order_opt with
			| false -> A.iter ~predicate list_text archive
			| true ->
				let order = match reverse_opt with true -> A.newest | false -> A.oldest in
				match number_opt with
				| Some number -> A.iter ~predicate ~order ~number list_text archive
				| None -> A.iter ~predicate ~order list_text archive

let list_term =
	let reverse = Arg.(value & flag & info ["r"] ~doc:"reverse order") in
	let time   = Arg.(value & flag & info ["t"] ~doc:"Sort by time, newest first") in
	let number = Arg.(value & opt (some int) None & info ["n"] ~docv:"NUMBER" ~doc:"number of entries to list") in
	let values = Arg.(value & opt (some string) None & info ["values"] ~docv:"HEADER-FIELD" ~doc:"unique values for header field") in
	let authed = Arg.(value & opt (some string) None & info ["authored"] ~docv:"AUTHORS" ~doc:"texts by authors") in
	let topics = Arg.(value & opt (some string) None & info ["topics"] ~docv:"TOPICS" ~doc:"texts with topics") in
	Term.(const text_list $ time $ reverse $ number $ values $ authed $ topics),
	Term.info "list" ~doc:"list texts" ~man:[ `S "DESCRIPTION"; `P "List texts" ]

let print_last search_mine =
	let last a ((t,_) as pair) = match a with None -> Some pair
		| Some (t', _) as pair' -> if Text.newest t t' > 0 then Some pair else pair' in
	match A.of_path (Sys.getcwd ()) with
	| Error msg -> prerr_endline msg
	| Ok archive ->
		let last_mine a ((t,_) as pair) =
			let open Text in
			match a with None ->
				if Person.Set.subset archive.A.archivists t.authors then Some pair else None
			| Some (t', _) as pair' ->
				if Text.newest t t' > 0 && Person.Set.subset archive.A.archivists t'.authors
				then Some pair else pair'
		in
		match A.fold (if search_mine then last_mine else last) None archive with
		| Some (_,f) -> print_endline f | None -> ()

let last_term =
	let mine = Arg.(value & flag & info ["mine"] ~doc:"last text authored by me") in
	Term.(const print_last $ mine),
	Term.info "last" ~doc:"most recent test" ~man:[ `S "DESCRIPTION"; `P "Print the filename of most recent text" ]

let split_filetypes files =
	let acc (dirs, files) x = if Sys.is_directory x then (x::dirs, files) else (dirs, x::files) in
	List.fold_left acc ([],[]) files

let file files = match A.of_path "." with
	| Error msg -> prerr_endline msg
	| Ok _archive ->
		let dirs, files = split_filetypes files in
		let _link_as_named dir file = Unix.link file (dir ^"/"^ file) in
		let link_with_id dir file =
			match File_store.to_text file with Error s -> prerr_endline s
			| Ok t -> Unix.link file (dir ^"/"^ String.sub (Id.to_string (t.Text.uuid)) 0 8 ^".txt")
		in
		let link = link_with_id in
		List.iter (fun d -> List.iter (link d) files) dirs

let file_term =
  let files = Arg.(value & pos_all string [] & info [] ~doc:"filenames") in
  let doc = "file texts in directories" in
  let man = [ `S "DESCRIPTION"; `P doc ] in 
  Term.(const file $ files), Term.info "file" ~doc ~man

let unfile files = match A.of_path "." with
  | Error msg -> prerr_endline msg
  | Ok _archive ->
  	let dirs, files = split_filetypes files in
		let unlink dir file = try Unix.unlink (dir ^"/"^ file) with Unix.(Unix_error(ENOENT,_,_))-> () in
	  List.iter (fun d -> List.iter (unlink d) files) dirs

let unfile_term =
  let files = Arg.(value & pos_all string [] & info [] ~doc:"filenames") in
  let doc = "unfile texts from directories" in
  let man = [ `S "DESCRIPTION"; `P doc ] in 
  Term.(const unfile $ files), Term.info "unfile" ~doc ~man

let init _force = File_store.init ()

let init_term =
  let force = Arg.(value & flag & info ["f"; "force"] ~doc:"Initialise even if directory is not empty") in
  let doc = "initialise a text repository in present directory" in
  let man = [ `S "DESCRIPTION"; `P "Start an archive in current directory" ] in 
  Term.(const init $ force), Term.info "init" ~doc ~man

let new_term =
  let f title topics_opt interactive =
  match A.of_path "." with
  | Error m -> prerr_endline m
  | Ok archive ->
    let t = match title with "" -> "Draft" | _ -> title in
    let authors = archive.archivists in
    let date = Date.({ created = Some (Ptime_clock.now ()); edited = None }) in
    let text = { (Text.blank ()) with title = t; authors; date } in
    let text = try Text.with_str_set text "Topics" (Option.get topics_opt) with _ -> text in
    match File_store.with_text archive text with
    | Error s -> prerr_endline s
    | Ok (filepath, _note) ->
      match interactive with false -> print_endline filepath
      | true ->
        print_endline @@ "Created: " ^ filepath;
        let _code = Sys.command ("$EDITOR " ^ filepath) in
        ()
  in
  let title = Arg.(value & pos 0 string "" & info [] ~docv:"TITLE" ~doc:"Title for new article") in
  let topics= Arg.(value & opt (some string) None & info ["t"; "topics"] ~docv:"TOPICS" ~doc:"Topics for new article") in
  let inter = Arg.(value & flag & info ["i"; "interactive"] ~doc:"Prompts through the steps of creation and publication") in
  let man = [ `S "DESCRIPTION";  `P "Create a new article, with title 'Draft' when none provided"] in 
  Term.(const f $ title $ topics $ inter), Term.info "new" ~doc:"create a new article" ~man

let default_cmd =
  let doc = "text archival & publishing" in
  let man = [ `S "BUGS"; `P "Submit bugs <mailto:logarion@lists.orbitalfox.eu?subject=Issue: " ] in
  Term.(ret (const (`Help (`Pager, None)))), Term.info "txt" ~version ~doc ~man

let cmds = [ init_term; new_term; file_term; unfile_term; list_term; last_term; Convert.term; Http.pull_term ]

let () =
  Random.self_init();
  match Term.eval_choice default_cmd cmds with `Error _ -> exit 1 | _ -> exit 0