# Download class implementation for Insight.
# Copyright (C) 1999, 2001 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 (GPL) 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.


# ----------------------------------------------------------------------
# Download window and associated procs
#
# ----------------------------------------------------------------------

itcl::body Download::constructor {args} {
  global gdb_pretty_name
  debug $args
  eval itk_initialize $args
  window_name "Download Status" "Download"
  add_hook download_progress_hook "$this update_download"

  label $itk_interior.dload -text "Downloading $filename to $gdb_pretty_name"

  label $itk_interior.stat
  set f [frame $itk_interior.f]

  set i 0
  while {$i <$num_sections} {
    iwidgets::feedback $f.meter$i -steps $num_steps
    grid forget [$f.meter$i component percentage]
    label $f.sec$i -text [lindex $section(names) $i] -anchor w
    label $f.num$i -text $bytes($i) -anchor e
    grid $f.sec$i $f.meter$i $f.num$i -padx 4 -pady 4 -sticky news
    incr i
  }
  grid columnconfigure $f 1 -weight 1

  button $itk_interior.cancel -text Cancel -command "$this cancel" \
    -state active -width 10

  pack $itk_interior.dload -padx 5 -pady 5 -side top -fill x -expand yes
  pack $itk_interior.stat -padx 5 -pady 5 -expand yes
  pack $itk_interior.f -padx 5 -pady 5 -fill x -expand yes

  pack $itk_interior.cancel -padx 5 -pady 5 -side bottom
  ::update idletasks
}

# ------------------------------------------------------------------
#  METHOD:  update_download - update the download meters
# ------------------------------------------------------------------
itcl::body Download::update_download { sec num tot } {

  # Loop through all the sections, marking each as either done or
  # updating its meter. This will mark all previous sections prior to
  # SEC as complete. 
  foreach s $section(names) {
    set i $section($s)

    if {$s == $sec} {
      # Advance feedback meter. The iwidgets meter leaves a lot to
      # be desired. No way to query the current setting. No way to
      # set the state of the meter by percentage. It only understands
      # steps, and we must be careful not to step the widget past the
      # the configured number of steps, or else the meter will be
      # set wrong. How lame.
      set steps [expr {$num / $bytes($i) * $num_steps}]
      if {[expr {$completed_steps($s) + $steps}] > $num_steps} {
	set steps [expr {$num_steps - $completed_steps($s)}]
      }
      incr completed_steps($s) $steps
      $itk_interior.f.meter$i step $steps
      break
    } else {
      # Section already loaded. Make sure meter is at 100%.
      if {$completed_steps($s) < $num_steps} {
        set steps [expr {$num_steps - $completed_steps($s)}]
        set completed_steps($s) $num_steps
        $itk_interior.f.meter$i step $steps
      }
    }
  }

  ::update
}

# ------------------------------------------------------------------
#  METHOD:  done - notification that the download is really complete
# ------------------------------------------------------------------
itcl::body Download::done { {msg ""} } {
  bell

  if {$msg == ""} {
    # download finished
    set secs [expr {[clock seconds] - $::download_start_time}]
    if {$secs == 0} { incr secs }
    $itk_interior.cancel config -state disabled
    set bps [expr {8 * $total_bytes / $secs / 1000}]
    $itk_interior.stat config -text "$total_bytes bytes in $secs seconds ($bps kbps)"
    
    # set all indicators to FULL
    foreach sec $section(names) {
      set i $section($sec)
      if {$completed_steps($sec) < $num_steps} {
        set steps [expr {$num_steps - $completed_steps($sec)}]
        set completed_steps($sec) $num_steps
        $itk_interior.f.meter$i step $steps
      }
    }
  } else {
    # download failed
    if {$msg != "CANCEL"} {
      $itk_interior.stat config -text $msg
    }
  }
  
  # enable OK button
  $itk_interior.cancel config -state active -text OK -command "delete object $this"
  ::update
}

# ------------------------------------------------------------------
#  METHOD:  cancel - cancel the download
# ------------------------------------------------------------------
itcl::body Download::cancel {} {
  debug "canceling the download"
  set ::download_cancel_ok 1
}

# ------------------------------------------------------------------
#  DESTRUCTOR - destroy window containing widget
# ------------------------------------------------------------------
itcl::body Download::destructor {} {
  remove_hook download_progress_hook "$this update_download"
}

itcl::body Download::do_download_hooks {} {
  set ::download_timer(ok) 1
}

itcl::body Download::download_hash { section num } {
  global download_timer
  debug "sec=$section num=$num tot=$total_bytes ok=$::download_cancel_ok"
  ::update
  # Only run the timer at discrete times...
  if {[info exists download_timer(timer)]} {
    after cancel $download_timer(timer)
  }
  
  set download_timer(timer) [after 100 Download::do_download_hooks]
  if {![info exists download_timer(ok)] || $download_timer(ok)} {
    run_hooks download_progress_hook $section $num $total_bytes
    ::update
    unset download_timer(timer)
    set download_timer(ok) 0
  }
  
  return $::download_cancel_ok
}

# Download the executable. Return zero for success, and non-zero for error.
itcl::body Download::download_it { } {
  global gdb_exe_name gdb_downloading gdb_loaded
  global gdb_target_name gdb_pretty_name
  global gdb_running gdbtk_platform

  debug "exe=$gdb_exe_name downloading=$gdb_downloading"
  debug "    loaded=$gdb_loaded target=$gdb_target_name running=$gdb_running"

  if {$gdb_downloading || $gdb_exe_name == ""} {
    return 0
  }

  set gdb_downloading 1
  set gdb_loaded 0
  # Make sure the source window has had time to be created
  ::update

  gdbtk_busy

  # Only places that load files should do set_exe
  #set_exe
  switch [set_target] {
    ERROR {
      # target command failed
      set gdb_downloading 0
      gdbtk_idle
      return 0
    }
    CANCELED {
      # command cancelled by user
      set gdb_downloading 0
      if {$gdb_running} {
	# Run the idle hooks (free the UI)
	gdbtk_update
	gdbtk_idle
      } else {
	gdbtk_idle
      }
      return 1
    }
  }

  if {[string compare $gdbtk_platform(os) "cygwin"] == 0} {
    set f [ide_cygwin_path to_win32 $gdb_exe_name]
  } else {
    set f $gdb_exe_name
  }
  if {! [file exists $f]} {
    tk_messageBox -icon error -title GDB -type ok \
      -message "Request to download non-existent executable $gdb_exe_name"
    set gdb_downloading 0
    gdbtk_idle
    return 0
  }

  debug "downloading $gdb_exe_name"

  set target $gdb_target_name

  # get load info and total up number of bytes
  if {[catch {gdb_load_info $gdb_exe_name} val]} {
    set result "$gdb_exe_name: $val"
    tk_dialog .load_warn "" "$result"  error 0 Ok
    return 0
  }
  set i 0
  set total_bytes 0
  set section(names) {}
  foreach x $val {
    set s [lindex $x 0]
    lappend section(names) $s
    set section($s) $i
    set b [lindex $x 1]
    set bytes($i) [expr {double($b)}]
    incr total_bytes $b
    set completed_steps($s) 0
    incr i
  }
  set num_sections $i

  set ::download_cancel_ok 0
  set ::download_start_time [clock seconds]

  if {[pref getd gdb/load/$target-verbose] == "1"} {
    # open a detailed download dialog window
    set download_dialog [ManagedWin::open Download -transient -filename $gdb_exe_name]
  } else {
    # raise source windows
    foreach src [ManagedWin::find SrcWin] {
      $src reveal
      $src toolbar downloading
    }
    set download_dialog ""
  }

  set download_error ""
  debug "starting load"
  ::update idletasks
  if {[catch {gdb_cmd "load $gdb_exe_name"} errTxt]} {
    debug "load returned $errTxt"
    if {[regexp -nocase cancel $errTxt]} {
      set download_error "CANCEL"
    } else {
      set download_error $errTxt
    }
    set ::download_cancel_ok 1
  }

  debug "Done loading"

  set gdb_downloading 0
  if {$::download_cancel_ok} {
    set gdb_loaded 0
    if {$download_dialog != ""} {
      catch {$download_dialog done $download_error}
    }
  } else {
    set gdb_loaded 1
    if {$download_dialog != ""} {
      catch {$download_dialog done}
    }
  }

  foreach src [ManagedWin::find SrcWin] {
    if {$download_error == "CANCEL"} {
      $src download_progress CANCEL 1 1
    } else {
      $src download_progress DONE 0 $total_bytes $download_error
    }
  }

  set ::download_cancel_ok 0
  set download_dialog ""

  gdbtk_idle
  return 0
}