#!/bin/bash
###############################################################################
# BRLTTY - A background process providing access to the console screen (when in
#          text mode) for a blind person using a refreshable braille display.
#
# Copyright (C) 1995-2021 by The BRLTTY Developers.
#
# BRLTTY comes with ABSOLUTELY NO WARRANTY.
#
# This is free software, placed under the terms of the
# GNU Lesser General Public License, as published by the Free Software
# Foundation; either version 2.1 of the License, or (at your option) any
# later version. Please see the file LICENSE-LGPL for details.
#
# Web Page: http://brltty.app/
#
# This software is maintained by Dave Mielke <dave@mielke.cc>.
###############################################################################

. "`dirname "${0}"`/../brltty-prologue.sh"
. "${programDirectory}/mingw.sh"

set -e
umask 022

readonly defaultArchiveRoot="http://brltty.app/archive/Windows"
readonly defaultTemporaryDirectory="${TMPDIR:-/tmp}/brltty-${programName}"

havePath() {
   local path="${1}"

   [ -n "${path}" ] || return 1
   [ -e "${path}" ] || return 2
   return 0
}

verifyDirectory() {
   local path="${1}"

   [ -e "${path}" ] || semanticError "directory not found: ${path}"
   [ -d "${path}" ] || semanticError "not a directory: ${path}"
   [ -w "${path}" ] || semanticError "directory not writable: ${path}"
   [ -r "${path}" ] || semanticError "directory not readable: ${path}"
   [ -x "${path}" ] || semanticError "directory not searchable: ${path}"
}

findCommand() {
   local variable="${1}"
   shift 1

   for name
   do
      local path="$(command -v "${name}")"
      [ -n "${path}" ] && {
         setVariable "${variable}" "${path}"
         return 0
      }
   done

   return 1
}

executeCommand() {
   logMessage detail "executing command: ${*}"

   exitStatus=0
   "${@}" || exitStatus="${?}"

   [ "${exitStatus}" -eq 0 ] || logMessage warning "command failed: ${1}: exit status ${exitStatus}"
   return "${exitStatus}"
}

downloadFile() {
   local source="${1}"
   local target="${2}"

   logMessage step "downloading file: ${source}"
   [ -z "${target}" ] && target="${source##*/}"
   executeCommand wget -nv -O "${target}" "${archiveRoot}/${source}"
}

unpackArchive() {
   local path="${1}"

   case "${path}"
   in
      *.zip) set -- unzip -q;;
      *.tar.gz) set -- tar xfz;;
      *) semanticError "unsupported archive: ${path}";;
   esac

   executeCommand "${@}" "${path}"
}

applyPatch() {
   local patch="${1}"
   local directory="${2}"
   local file="${3}"
   local pattern="${4}"

   local path="${directory}/${file}"

   if [ -f "${path}" ]
   then
      grep -q "${pattern}" "${path}" || {
         local name="${patch##*/}"
         logMessage task "applying patch: ${name}"

         "${dryRun}" || {
            downloadFile "${patch}"
            executeCommand patch -N -i "${temporaryDirectory}/${name}" -d "${directory}" "${file}"
         }
      }
   else
      logMessage warning "file not found: ${path}"
   fi
}

installFile() {
   local file="${1}"
   local directory="${2}"

   local source="${file##*/}"
   local target="${directory}/${source}"

   [ -e "${target}" ] || {
      logMessage task "installing file: ${target}"

      "${dryRun}" || {
         downloadFile "${file}"
         [ -d "${directory}" ] || executeCommand mkdir -p "${directory}"
         executeCommand cp "${source}" "${target}"
      }
   }
}

installLink() {
   local to="${1}"
   local directory="${2}"
   local name="${3}"

   [ -n "${name}" ] || name="${to##*/}"
   local from="${directory}/${name}"

   havePath "${from}" || {
      logMessage task "installing link: ${from} -> ${to}"
      [ -e "${to}" ] || semanticError "link target not found: ${to}"
      "${dryRun}" || executeCommand ln -s "${to}" "${from}"
   }
}

installWindowsArchive() {
   local archive="${1}"
   local path="${2}"

   havePath "${path}" || {
      logMessage task "installing Windows archive: ${archive}"

      "${dryRun}" || {
         downloadFile "${archive}"

         local directory="content-${archive}"
         executeCommand mkdir "${directory}"
         executeCommand cd "${directory}"

         unpackArchive "../${archive}"
         set -- *

         if [ "${#}" -eq 1 -a -d "${1}" ]
         then
            executeCommand mv "${1}" "${path}"
            executeCommand cd ..
            executeCommand rmdir "${directory}"
         else
            executeCommand cd ..
            executeCommand mv "${directory}" "${path}"
         fi
      }
   }
}

installMingwArchive() {
   local archive="${1}"
   local path="${2}"

   havePath "${mingwDirectory}/${path}" || {
      logMessage task "installing MinGW archive: ${archive}"

      "${dryRun}" || {
         downloadFile "MinGW/${archive}"
         executeCommand cd "${mingwDirectory}"
         unpackArchive "${temporaryDirectory}/${archive}"
         executeCommand cd "${temporaryDirectory}"
      }
   }
}

installMingwPackage() {
   local package="${1}"
   local path="${2}"

   havePath "${path}" || {
      logMessage task "installing MinGW package: ${package}"
      "${dryRun}" || executeCommand mingw-get --verbose=0 install "${package}"
   }
}

installMicrosoftVisualCTools() {
   local file

   for file in lib.exe link.exe mspdb100.dll msvcr100.dll
   do
      installFile "MSVC/${file}" "/usr/local/bin"
   done
}

installPackageConfigurationFiles() {
   local package

   for package in libusb libusb-1.0
   do
      installFile "pkgconfig/${package}.pc" "${librariesDirectory}/pkgconfig"
   done
}

installBluetoothHeaders() {
   local name

   for name in ws2bth bthdef bthsdpdef
   do
      installFile "Bluetooth/${name}.h" "${headersDirectory}"
   done
}

installLibUSB0() {
   local directory="${windowsDirectory}/LibUSB-Win32"
   installWindowsArchive libusb-win32-bin-1.2.6.0.zip "${directory}"
   installLink "${directory}/include/lusb0_usb.h" "${headersDirectory}" usb.h
   installLink "${directory}/lib/gcc/libusb.a" "${librariesDirectory}"
   installLink "${directory}/bin/x86/libusb0_x86.dll" "${commandsDirectory}" libusb0.dll
}

installLibUSB1() {
   local directory="${windowsDirectory}/LibUSB-1.0"
   installWindowsArchive libusbx-1.0.18-win.tar.gz "${directory}"
   installLink "${directory}/include/libusbx-1.0" "${headersDirectory}" libusb-1.0
   installLink "${directory}/MinGW32/dll/libusb-1.0.dll.a" "${librariesDirectory}"
   installLink "${directory}/MinGW32/dll/libusb-1.0.dll" "${commandsDirectory}"
   installWindowsArchive winusb.zip "${windowsDirectory}/WinUSB"
}

installCython() {
   local python

   if findCommand python python py
   then
      export PYTHONIOENCODING="utf-8"
      local directory="${python%/*}"

      findCommand cython cython || {
         logMessage task "installing Cython"
         "${dryRun}" || executeCommand pip -q install cython
      }

      installFile Cython/vcruntime140.dll "${directory}/libs"
      installFile Cython/distutils.cfg "${directory}/lib/distutils"
      applyPatch "Cython/PythonCygwinCCompiler.patch" "${directory}/lib/distutils" "cygwinccompiler.py" "vcruntime140"
   else
      logMessage warning "Python not found"
   fi
}

addProgramOption a string.URL archiveRoot "the URL for BRLTTY's Windows archive" "${defaultArchiveRoot}"
addProgramOption d flag dryRun "dry run - don't actually install anything"
addProgramOption k flag keepFiles "keep (do not remove) the temporary directory"
addProgramOption p string.directory pythonDirectory "the directory where Python has been installed"
addProgramOption t string.directory temporaryDirectory "the temporary directory to use" "${defaultTemporaryDirectory}"
parseProgramArguments "${@}"

[ -n "${archiveRoot}" ] || archiveRoot="${defaultArchiveRoot}"

[ -n "${pythonDirectory}" ] && {
   [ -d "${pythonDirectory}" ] || semanticError "Python directory not found: ${pythonDirectory}"
   PATH="${pythonDirectory}:${pythonDirectory}/scripts:${PATH}"
}

readonly windowsDirectory="/c"
verifyDirectory "${windowsDirectory}"

readonly mingwDirectory="/mingw"
verifyDirectory "${mingwDirectory}"

readonly commandsDirectory="${mingwDirectory}/bin"
verifyDirectory "${commandsDirectory}"

readonly librariesDirectory="${mingwDirectory}/lib"
verifyDirectory "${librariesDirectory}"

readonly headersDirectory="${mingwDirectory}/include"
verifyDirectory "${headersDirectory}"

if [ -z "${temporaryDirectory}" ]
then
   temporaryDirectory="${defaultTemporaryDirectory}"
   rm -f -r "${temporaryDirectory}"
elif [ -e "${temporaryDirectory}" ]
then
   semanticError "directory already exists: ${temporaryDirectory}"
fi

mkdir -p "${temporaryDirectory}"
cd "${temporaryDirectory}"
temporaryDirectory="$(pwd -W)"

installMingwPackage msys-bison /bin/bison
installMingwPackage msys-dos2unix /bin/dos2unix
installMingwPackage msys-groff /bin/groff
installMingwPackage msys-m4 /bin/m4
installMingwPackage msys-tar /bin/tar
installMingwPackage msys-unzip /bin/unzip
installMingwPackage msys-wget /bin/wget
installMingwPackage msys-zip /bin/zip

installMingwPackage mingw32-libpdcurses /mingw/include/curses.h
installMingwPackage mingw32-pthreads-w32 /mingw/include/pthread.h
installMingwPackage mingw32-tcl /mingw/bin/tclsh

installMicrosoftVisualCTools
installPackageConfigurationFiles
installBluetoothHeaders

installMingwArchive pkg-config_0.28-1_win32.zip "bin/pkg-config.exe"
installMingwArchive glib_2.34.3-1_win32.zip "bin/libgobject-2.0-0.dll"

installWindowsArchive AutoHotkey104805.tar.gz "${ahkLocation}"
installWindowsArchive nsis-3.0b0.tar.gz "${nsisLocation}"
installWindowsArchive icu4c-53_1-Win32-msvc10.zip "${icuLocation}"

installLibUSB0
installLibUSB1
installCython

"${keepFiles}" || {
   logMessage task "cleaning up"
   cd "${initialDirectory}"
   rm -f -r "${temporaryDirectory}"
}

logMessage task "done"
exit 0