(* Guestfs Browser.
 * Copyright (C) 2010 Red Hat Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *)

open ExtString

open Printf

let (+^) = Int64.add
let (-^) = Int64.sub
let ( *^ ) = Int64.mul
let (/^) = Int64.div

type ('a, 'b) either = Left of 'a | Right of 'b

let (//) = Filename.concat

let verbose = ref false
let set_verbose_flag () = verbose := true
let verbose () = !verbose

let debug fs =
  let f str =
    if verbose () then (
      prerr_string Config.package;
      prerr_string ": tid ";
      prerr_string (string_of_int (Thread.id (Thread.self ())));
      prerr_string ": ";
      prerr_string str;
      prerr_newline ()
    )
  in
  ksprintf f fs

let failwith fs =
  let f str =
    if verbose () then (prerr_string str; prerr_newline ());
    raise (Failure str)
  in
  ksprintf f fs

let trace = ref false
let set_trace_flag () = trace := true
let trace () = !trace

let connect_uri = ref None
let set_connect_uri conn = connect_uri := conn
let connect_uri () = !connect_uri

let utf8_rarrow = "\xe2\x86\x92"

let human_size i =
  if i < 1024L then
    sprintf "%Ld" i
  else if i < 1024L *^ 1024L then
    sprintf "%.1f KB" (Int64.to_float i /. 1024.)
  else if i < 1024L *^ 1024L *^ 1024L then
    sprintf "%.1f MB" (Int64.to_float i /. 1024. /. 1024.)
  else if i < 1024L *^ 1024L *^ 1024L *^ 1024L then
    sprintf "%.1f GB" (Int64.to_float i /. 1024. /. 1024. /. 1024.)
  else
    sprintf "%.1f TB" (Int64.to_float i /. 1024. /. 1024. /. 1024. /. 1024.)

let human_size_1k i =
  if i < 1024L then
    sprintf "%Ld KB" i
  else if i < 1024L *^ 1024L then
    sprintf "%.1f MB" (Int64.to_float i /. 1024.)
  else
    sprintf "%.1f GB" (Int64.to_float i /. 1024. /. 1024.)

let unique = let i = ref 0 in fun () -> incr i; !i

let mklabel text =
  (GMisc.label ~text () :> GObj.widget)

(* g_markup_escape is not bound by lablgtk2, but we want to provide
 * extra protection for \0 characters appearing in the string
 * anyway.
 *)
let markup_escape name =
  let f = function
    | '&' -> "&amp;" | '<' -> "&lt;" | '>' -> "&gt;"
    | '\000' -> "\\0"
    | c -> String.make 1 c
  in
  String.replace_chars f name

let libguestfs_version_string () =
  let g = new Guestfs.guestfs () in
  let v = g#version () in
  let s =
    sprintf "%Ld.%Ld.%Ld%s"
      v.Guestfs.major v.Guestfs.minor v.Guestfs.release v.Guestfs.extra in
  g#close ();
  s

let libvirt_version_string () =
  let v = fst (Libvirt.get_version ()) in
  sprintf "%d.%d.%d" (v / 1_000_000) ((v / 1_000) mod 1_000) (v mod 1_000)

(* File type tests.
 *
 * Note these have to be on Linux ABI modes.  We cannot use the
 * OCaml (ie. host) equivalents here.
 *)
let rec file_type mask mode = Int64.logand mode 0o170000L = mask

and is_socket mode =       file_type 0o140000L mode
and is_symlink mode =      file_type 0o120000L mode
and is_regular_file mode = file_type 0o100000L mode
and is_block mode =        file_type 0o060000L mode
and is_directory mode =    file_type 0o040000L mode
and is_char mode =         file_type 0o020000L mode
and is_fifo mode =         file_type 0o010000L mode

and is_suid mode =         test_bit 0o4000L mode
and is_sgid mode =         test_bit 0o2000L mode
and is_svtx mode =         test_bit 0o1000L mode

and is_ru mode =           test_bit 0o400L mode
and is_wu mode =           test_bit 0o200L mode
and is_xu mode =           test_bit 0o100L mode
and is_rg mode =           test_bit 0o040L mode
and is_wg mode =           test_bit 0o020L mode
and is_xg mode =           test_bit 0o010L mode
and is_ro mode =           test_bit 0o004L mode
and is_wo mode =           test_bit 0o002L mode
and is_xo mode =           test_bit 0o001L mode

and test_bit mask mode = Int64.logand mode mask = mask

let tmpdir () =
  let chan = open_in "/dev/urandom" in
  let data = String.create 16 in
  really_input chan data 0 (String.length data);
  close_in chan;
  let data = Digest.to_hex (Digest.string data) in
  (* Note this is secure, because if the name already exists, even as a
   * symlink, mkdir(2) will fail.
   *)
  let tmpdir = Filename.temp_dir_name // sprintf "febootstrap%s.tmp" data in
  Unix.mkdir tmpdir 0o700;
  at_exit
    (fun () ->
       let cmd = sprintf "rm -rf %s" (Filename.quote tmpdir) in
       ignore (Sys.command cmd));
  tmpdir

(* This would be so much simpler with ChriS's delimited
 * overloading macro XXX
 *)
let i32_of_string_le v =
  let b0 = int_of_char (String.unsafe_get v 0) in
  let b1 = int_of_char (String.unsafe_get v 1) in
  let b2 = int_of_char (String.unsafe_get v 2) in
  let b3 = Int32.of_int (int_of_char (String.unsafe_get v 3)) in
  Int32.logor
    (Int32.of_int (b0 lor (b1 lsl 8) lor (b2 lsl 16)))
    (Int32.shift_left b3 24)

let i32_of_string_be v =
  let b0 = Int32.of_int (int_of_char (String.unsafe_get v 0)) in
  let b1 = int_of_char (String.unsafe_get v 1) in
  let b2 = int_of_char (String.unsafe_get v 2) in
  let b3 = int_of_char (String.unsafe_get v 3) in
  Int32.logor
    (Int32.of_int (b3 lor (b2 lsl 8) lor (b1 lsl 16)))
    (Int32.shift_left b0 24)

let i64_of_string_le v =
  let b0 = int_of_char (String.unsafe_get v 0) in
  let b1 = int_of_char (String.unsafe_get v 1) in
  let b2 = int_of_char (String.unsafe_get v 2) in
  let b3 = Int64.of_int (int_of_char (String.unsafe_get v 3)) in
  let b4 = Int64.of_int (int_of_char (String.unsafe_get v 4)) in
  let b5 = Int64.of_int (int_of_char (String.unsafe_get v 5)) in
  let b6 = Int64.of_int (int_of_char (String.unsafe_get v 6)) in
  let b7 = Int64.of_int (int_of_char (String.unsafe_get v 7)) in
  Int64.logor
    (Int64.logor
       (Int64.logor
          (Int64.logor
             (Int64.logor
                (Int64.of_int (b0 lor (b1 lsl 8) lor (b2 lsl 16)))
                (Int64.shift_left b3 24))
             (Int64.shift_left b4 32))
          (Int64.shift_left b5 40))
       (Int64.shift_left b6 48))
    (Int64.shift_left b7 56)