/*
  bug.n -- tiling window management
  Copyright (c) 2010-2012 Joshua Fuhs, joten
  
  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 3 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, see <http://www.gnu.org/licenses/>.
  
  @version 8.3.0
*/

Manager_init() {
  Local ncm, ncmSize
  
  ; Windows UI
  If Config_selBorderColor {
    SetFormat, Integer, hex
    Manager_normBorderColor := DllCall("GetSysColor", "Int", 10)
    SetFormat, Integer, d
    DllCall("SetSysColors", "Int", 1, "Int*", 10, "UInt*", Config_selBorderColor)
  }
  If (Config_borderWidth > 0) Or (Config_borderPadding >= 0 And A_OSVersion = WIN_VISTA) {
    ncmSize := VarSetCapacity(ncm, 4 * (A_OSVersion = WIN_VISTA ? 11 : 10) + 5 * (28 + 32 * (A_IsUnicode ? 2 : 1)), 0)
    NumPut(ncmSize, ncm, 0, "UInt")
    DllCall("SystemParametersInfo", "UInt", 0x0029, "UInt", ncmSize, "UInt", &ncm, "UInt", 0)
    Manager_borderWidth := NumGet(ncm, 4, "Int")
    Manager_borderPadding := NumGet(ncm, 40 + 5 * (28 + 32 * (A_IsUnicode ? 2 : 1)), "Int")
    If (Config_borderWidth > 0)
      NumPut(Config_borderWidth, ncm, 4, "Int")
    If (Config_borderPadding >= 0 And A_OSVersion = WIN_VISTA)
      NumPut(Config_borderPadding, ncm, 40 + 5 * (28 + 32 * (A_IsUnicode ? 2 : 1)), "Int")
    DllCall("SystemParametersInfo", "UInt", 0x002a, "UInt", ncmSize, "UInt", &ncm, "UInt", 0)
  }
  
  Bar_getHeight()
  Manager_aMonitor := 1
  Manager_taskBarMonitor := ""
  Manager_showTaskBar := True
  SysGet, Manager_monitorCount, MonitorCount
  Loop, % Manager_monitorCount
    Monitor_init(A_Index)
  Bar_initCmdGui()
  If Not Config_showTaskBar
    Monitor_toggleTaskBar()
  
  Manager_focus         := False
  Manager_hideShow      := False
  Bar_hideTitleWndIds   := ""
  Manager_allWndIds     := ""
  Manager_managedWndIds := ""
  Manager_initial_sync()
  
  Bar_updateStatus()
  Bar_updateTitle()
  Loop, % Manager_monitorCount {
    View_arrange(A_Index, Monitor_#%A_Index%_aView_#1)
    Bar_updateView(A_Index, Monitor_#%A_Index%_aView_#1)
  }
  
  Manager_registerShellHook()
  SetTimer, Bar_loop, %Config_readinInterval%
}

Manager_activateMonitor(d) {
  Local aView, aWndClass, aWndHeight, aWndId, aWndWidth, aWndX, aWndY, v, wndId
  
  If (Manager_monitorCount > 1) {
    aView := Monitor_#%Manager_aMonitor%_aView_#1
    WinGet, aWndId, ID, A
    If WinExist("ahk_id" aWndId) {
      WinGetClass, aWndClass, ahk_id %aWndId%
      If Not (aWndClass = "Progman") And Not (aWndClass = "AutoHotkeyGui") And Not (aWndClass = "DesktopBackgroundClass") {
        WinGetPos, aWndX, aWndY, aWndWidth, aWndHeight, ahk_id %aWndId%
        If (Monitor_get(aWndX + aWndWidth / 2, aWndY + aWndHeight / 2) = Manager_aMonitor)
          View_#%Manager_aMonitor%_#%aView%_aWndId := aWndId
      }
    }
    
    Manager_aMonitor := Manager_loop(Manager_aMonitor, d, 1, Manager_monitorCount)
    v := Monitor_#%Manager_aMonitor%_aView_#1
    wndId := View_#%Manager_aMonitor%_#%v%_aWndId
    If Not (wndId And WinExist("ahk_id" wndId)) {
      If View_#%Manager_aMonitor%_#%v%_wndIds
        wndId := SubStr(View_#%Manager_aMonitor%_#%v%_wndIds, 1, InStr(View_#%Manager_aMonitor%_#%v%_wndIds, ";")-1)
      Else
        wndId := 0
    }
    Manager_winActivate(wndId)
  }
}

Manager_applyRules(wndId, ByRef isManaged, ByRef m, ByRef tags, ByRef isFloating, ByRef isDecorated, ByRef hideTitle) {
  Local mouseX, mouseY, wndClass, wndHeight, wndStyle, wndTitle, wndWidth, wndX, wndY
  Local rule0, rule1, rule2, rule3, rule4, rule5, rule6, rule7, rule8, rule9
  
  isManaged   := True
  m           := 0
  tags        := 0
  isFloating  := False
  isDecorated := False
  hideTitle   := False
  
  WinGetClass, wndClass, ahk_id %wndId%
  WinGetTitle, wndTitle, ahk_id %wndId%
  WinGetPos, wndX, wndY, wndWidth, wndHeight, ahk_id %wndId%
  WinGet, wndStyle, Style, ahk_id %wndId%
  If wndClass And wndTitle And Not (wndX < -4999) And Not (wndY < -4999) {
    Loop, % Config_ruleCount {
      StringSplit, rule, Config_rule_#%A_index%, `;
      If RegExMatch(wndClass . ";" . wndTitle, rule1 . ";" . rule2) And (rule3 = "" Or wndStyle & rule3) {  ; The last matching rule is returned.
        isManaged   := rule4
        m           := rule5
        tags        := rule6
        isFloating  := rule7
        isDecorated := rule8
        hideTitle   := rule9
      }
    }
  } Else {
    isManaged := False
    If wndTitle
      hideTitle := True
  }
}

Manager_cleanup() {
  Local aWndId, m, ncmSize, ncm, wndIds
  
  WinGet, aWndId, ID, A
  
  ; Reset border color, padding and witdh.
  If Config_selBorderColor
    DllCall("SetSysColors", "Int", 1, "Int*", 10, "UInt*", Manager_normBorderColor)
  If (Config_borderWidth > 0) Or (Config_borderPadding >= 0 And A_OSVersion = WIN_VISTA) {
    ncmSize := VarSetCapacity(ncm, 4 * (A_OSVersion = WIN_VISTA ? 11 : 10) + 5 * (28 + 32 * (A_IsUnicode ? 2 : 1)), 0)
    NumPut(ncmSize, ncm, 0, "UInt")
    DllCall("SystemParametersInfo", "UInt", 0x0029, "UInt", ncmSize, "UInt", &ncm, "UInt", 0)
    If (Config_borderWidth > 0)
      NumPut(Manager_borderWidth, ncm, 4, "Int")
    If (Config_borderPadding >= 0 And A_OSVersion = WIN_VISTA)
      NumPut(Manager_borderPadding, ncm, 40 + 5 * (28 + 32 * (A_IsUnicode ? 2 : 1)), "Int")
    DllCall("SystemParametersInfo", "UInt", 0x002a, "UInt", ncmSize, "UInt", &ncm, "UInt", 0)
  }
  
  ; Show borders and title bars.
  StringTrimRight, wndIds, Manager_managedWndIds, 1
  Manager_hideShow := True
  Loop, PARSE, wndIds, `;
  {
    Manager_winShow(A_LoopField)
    If Not Config_showBorder
      Manager_winSet("Style", "+0x40000", A_LoopField)
    Manager_winSet("Style", "+0xC00000", A_LoopField)
  }
  
  ; Show the task bar.
  WinShow, Start ahk_class Button
  WinShow, ahk_class Shell_TrayWnd
  Manager_hideShow := False
  
  ; Reset windows position and size.
  Manager_showTaskBar := True
  Loop, % Manager_monitorCount {
    m := A_Index
    Monitor_#%m%_showBar := False
    Monitor_getWorkArea(m)
    Loop, % Config_viewCount
      View_arrange(m, A_Index)
  }
  Manager_winSet("AlwaysOnTop", "On", aWndId)
  Manager_winSet("AlwaysOnTop", "Off", aWndId)
  
  DllCall("Shell32.dll\SHAppBarMessage", "UInt", (ABM_REMOVE := 0x1), "UInt", &Bar_appBarData)
  ; SKAN: Crazy Scripting : Quick Launcher for Portable Apps (http://www.autohotkey.com/forum/topic22398.html)
}

Manager_closeWindow() {
  WinGet, aWndId, ID, A
  WinGetClass, aWndClass, ahk_id %aWndId%
  WinGetTitle, aWndTitle, ahk_id %aWndId%
  If Not (aWndClass = "AutoHotkeyGUI" And RegExMatch(aWndTitle, "bug.n_BAR_[0-9]+"))
    Manager_winClose(aWndId)
}

Manager_getWindowInfo() {
  Local text, v, aWndClass, aWndHeight, aWndId, aWndProcessName, aWndStyle, aWndTitle, aWndWidth, aWndX, aWndY
  
  WinGet, aWndId, ID, A
  WinGetClass, aWndClass, ahk_id %aWndId%
  WinGetTitle, aWndTitle, ahk_id %aWndId%
  WinGet, aWndProcessName, ProcessName, ahk_id %aWndId%
  WinGet, aWndStyle, Style, ahk_id %aWndId%
  WinGetPos, aWndX, aWndY, aWndWidth, aWndHeight, ahk_id %aWndId%
  text := "ID: " aWndId "`nclass:`t" aWndClass "`ntitle:`t" aWndTitle
  If InStr(Bar_hiddenWndIds, aWndId)
    text .= " (hidden)"
  text .= "`nprocess:`t" aWndProcessName "`nstyle:`t" aWndStyle "`nmetrics:`tx: " aWndX ", y: " aWndY ", width: " aWndWidth ", height: " aWndHeight "`ntags:`t" Manager_#%aWndId%_tags
  If Manager_#%aWndId%_isFloating
    text .= " (floating)"
  MsgBox, 260, bug.n: Window Information, % text "`n`nCopy text to clipboard?"
  IfMsgBox Yes
    Clipboard := text
}

Manager_getWindowList() {
  Local text, v, aWndId, wndIds, aWndTitle
  
  v := Monitor_#%Manager_aMonitor%_aView_#1
  aWndId := View_#%Manager_aMonitor%_#%v%_aWndId
  WinGetTitle, aWndTitle, ahk_id %aWndId%
  text := "Active Window`n" aWndId ":`t" aWndTitle
  
  StringTrimRight, wndIds, View_#%Manager_aMonitor%_#%v%_wndIds, 1
  text .= "`n`nWindow List"
  Loop, PARSE, wndIds, `;
  {
    WinGetTitle, wndTitle, ahk_id %A_LoopField%
    text .= "`n" A_LoopField ":`t" wndTitle
  }
  
  MsgBox, 260, bug.n: Window List, % text "`n`nCopy text to clipboard?"
  IfMsgBox Yes
    Clipboard := text
}

Manager_logViewLayout() {

}

Manager_logWindowInfo( w ) {
  Local v, wndId, isWinFocus, isBugnActive, isFloating, isHidden, isDecorated, isResponsive, isGhost, wndTitle, wndProc, wndClass, wndStyle, wndX, wndY, wndW, wndH, detect_state
  
  detect_state := A_DetectHiddenWindows
  DetectHiddenWindows, On
  WinGet, wndId, ID, A
  If wndId = %w%
    isWinFocus := "*"
  Else
    isWinFocus := " "
  v := Monitor_#%Manager_aMonitor%_aView_#1
  If View_#%Manager_aMonitor%_#%v%_aWndId = %w%
    isBugnActive := "*"
  Else
    isBugnActive := " "
  WinGetTitle, wndTitle, ahk_id %w%
  WinGetClass, wndClass, ahk_id %w%
  WinGet, wndProc, ProcessName, ahk_id %w%
  If InStr(Bar_hiddenWndIds, w)
    isHidden := "*"
  Else 
    isHidden := " "
  If Manager_#%w%_isFloating
    isFloating := "*"
  Else
    isFloating := " "
  If Manager_#%w%_isDecorated
    isDecorated := "*"
  Else
    isDecorated := " "
  WinGet, wndStyle, Style, ahk_id %w%
  WinGetPos, wndX, wndY, wndW, wndH, ahk_id %w%
  
  If Manager_isGhost(w)
    isGhost := "*"
  Else
    isGhost := " "
  
  DetectHiddenWindows, %detect_state%
  
  ; Intentionally don't detect hidden windows here to see what Manager_hungTest does
  If Manager_isHung(w)
    isResponsive := " "
  Else
    isResponsive := "*"
    
  
  Log_bare(w . "`t" . isHidden . " " isWinFocus . " " . isBugnActive . " " . isFloating . " " . isDecorated . " " . isResponsive . " " . isGhost . " " . Manager_#%w%_monitor . "`t" . Manager_#%w%_tags . "`t" . wndX . "`t" . wndY . "`t" . wndW . "`t" . wndH . "`t" . wndStyle . "`t" . wndProc . " / " . wndClass . " / " . wndTitle)
}

Manager_logHeader() {
  Log_bare( "ID`t`tH W A F D R G M`tTags`tX`tY`tW`tH`tStyle`t`tProc / Class / Title")
}

Manager_logViewWindowList() {
  Local text, v, aWndId, wndIds, aWndTitle
  
  v := Monitor_#%Manager_aMonitor%_aView_#1
  Log_msg( "Window dump for active view (" . Manager_aMonitor . ", " . v . ")" )
  Manager_logHeader()
  
  StringTrimRight, wndIds, View_#%Manager_aMonitor%_#%v%_wndIds, 1
  Loop, PARSE, wndIds, `;
  {
    Manager_logWindowInfo( A_LoopField )
  }
}

Manager_logManagedWindowList() {
  Local wndIds
  
  Log_msg( "Window dump for manager" )
  Manager_logHeader()
  
  StringTrimRight, wndIds, Manager_managedWndIds, 1
  Loop, PARSE, wndIds, `;
  {
    Manager_logWindowInfo( A_LoopField)
  }
}

Manager_logHelp() {
  Log_msg("Help Display")
  Log_bare("Window list columns")
  Log_bare("    ID - Windows ID. Unique, OS-assigned ID")
  Log_bare("    H - Hidden. Whether bug.n thinks this window is hidden.")
  Log_bare("    W - Windows active. This window is active according to Windows.")
  Log_bare("    A - View active. This window is active according to bug.n.")
  Log_bare("    F - Floating. This window should not be positioned and resized by the layout.")
  Log_bare("    D - Decorated. Does the window have a title bar?")
  Log_bare("    R - Responsive. Is responding to messages?")
  Log_bare("    G - Ghost. Is this window a ghost of another hung window?")
  Log_bare("    M - Monitor number.")
  Log_bare("    Tags - Bit-mask of the views in which the window is active.")
  Log_bare("    X - Windows X position.")
  Log_bare("    Y - Windows Y position.")
  Log_bare("    W - Windows width.")
  Log_bare("    H - Windows height.")
  Log_bare("    Style - Windows style.")
  Log_bare("    Proc / Class / Title - Process/Class/Title of the window.")
}

Manager_lockWorkStation() {
  Global Config_shellMsgDelay
  
  RegWrite, REG_DWORD, HKEY_CURRENT_USER, Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableLockWorkstation, 0
  Sleep, % Config_shellMsgDelay
  DllCall("LockWorkStation")
  Sleep, % 4 * Config_shellMsgDelay
  RegWrite, REG_DWORD, HKEY_CURRENT_USER, Software\Microsoft\Windows\CurrentVersion\Policies\System, DisableLockWorkstation, 1
}
; Unambiguous: Re-use WIN+L as a hotkey in bug.n (http://www.autohotkey.com/community/viewtopic.php?p=500903&sid=eb3c7a119259b4015ff045ef80b94a81#p500903)

Manager_loop(index, increment, lowerBound, upperBound) {
  index += increment
  If (index > upperBound)
    index := lowerBound
  If (index < lowerBound)
    index := upperBound
  If (upperBound = 0)
    index := 0
  
  Return, index
}

; Accept a window to be added to the system for management.
; Provide a monitor, view preference, but don't override the config.
; pm - Preferred monitor
; pv - Preferred view
; wndId - Window to add to the manager.
Manager_manage(pm, pv, wndId) {
  Local a, c0, hideTitle, i, isDecorated, isFloating, isManaged, l, m, n, replace, search, tags, body
    Local wndControlList0, wndId0, wndIds, wndX, wndY, wndWidth, wndHeight, wndProcessName
  
  If Not InStr(Manager_allWndIds, wndId ";")
    Manager_allWndIds .= wndId ";"
  
  body := 0
  If Manager_isGhost( wndId ) {
    Log_dbg_msg(2, "A window has given up the ghost (Ghost wndId: " . wndId . ")")
    ; Ghosts need special attention.
    ; Say a quick prayer and try to reattach it to its body.
    body := Manager_findHung( wndId )
    If body {
      isManaged := InStr(Manager_managedWndIds, body ";")
      m := Manager_#%body%_monitor
      tags := Manager_#%body%_tags
      isDecorated := Manager_#%body%_isDecorated
      isFloating := Manager_#%body%_isFloating
      hideTitle := InStr(Bar_hideTitleWndIds, body ";")
    }
    Else {
      Log_dbg_msg(1, "No body could be found for ghost wndId: " . wndId)
    }
  }
  
  ; Apply rules if the window is either a normal window or a ghost without a body.
  If ( body = 0 ) {
    Manager_applyRules(wndId, isManaged, m, tags, isFloating, isDecorated, hideTitle)
    
    If (m = 0)
      m := pm
    If (m < 0)
      m := 1
    If (m > Manager_monitorCount)  ; If the specified monitor is out of scope, set it to the max. monitor.
      m := Manager_monitorCount
    If (tags = 0)
      tags := 1 << (pv - 1)
  }
  
  WinGet, wndProcessName, ProcessName, ahk_id %wndId%
  If (wndProcessName = "chrome.exe") {
    WinGet, wndControlList, ControlList, ahk_id %wndId%
    StringSplit, c, wndControlList, `n
    If (c0 <= 1)
      isManaged := False
  }
  
  If isManaged {
    Monitor_moveWindow(m, wndId)

    Manager_managedWndIds .= wndId ";"
    Manager_#%wndId%_monitor     := m
    Manager_#%wndId%_tags        := tags
    Manager_#%wndId%_isDecorated := isDecorated
    Manager_#%wndId%_isFloating  := isFloating
    
    Loop, % Config_viewCount
      If (Manager_#%wndId%_tags & 1 << A_Index - 1) {
        If (body) {
          ; Try to position near the body.
          View_ghostWnd(m, A_Index, body, wndId)
        }
        Else {
          View_addWnd(m, A_Index, wndId)
        }
      }
    
    If Not Config_showBorder
      Manager_winSet("Style", "-0x40000", wndId)
    If Not Manager_#%wndId%_isDecorated
      Manager_winSet("Style", "-0xC00000", wndId)
    
    a := Manager_#%wndId%_tags & 1 << Monitor_#%m%_aView_#1 - 1
    If a {
      Manager_aMonitor := m
      Manager_winActivate(wndId)
    } Else {
      Manager_hideShow := True
      Manager_winHide(wndId)
      Manager_hideShow := False
    }
  }
  
  If hideTitle And Not InStr(Bar_hideTitleWndIds, wndId)
    Bar_hideTitleWndIds .= wndId . ";"
  Else If Not hideTitle
    StringReplace, Bar_hideTitleWndIds, Bar_hideTitleWndIds, %wndId%`;, 
  
  Return, a
}

Manager_maximizeWindow() {
  Local aWndId, l, v
  
  WinGet, aWndId, ID, A
  v := Monitor_#%Manager_aMonitor%_aView_#1
  l := View_#%Manager_aMonitor%_#%v%_layout_#1
  If Not Manager_#%aWndId%_isFloating And Not (Config_layoutFunction_#%l% = "")
    View_toggleFloating()
  Manager_winSet("Top", "", aWndId)
  
  Manager_winMove(aWndId, Monitor_#%Manager_aMonitor%_x, Monitor_#%Manager_aMonitor%_y, Monitor_#%Manager_aMonitor%_width, Monitor_#%Manager_aMonitor%_height)
}

Manager_moveWindow() {
  Local aWndId, l, SC_MOVE, v, WM_SYSCOMMAND
  
  WinGet, aWndId, ID, A
  v := Monitor_#%Manager_aMonitor%_aView_#1
  l := View_#%Manager_aMonitor%_#%v%_layout_#1
  If Not Manager_#%aWndId%_isFloating And Not (Config_layoutFunction_#%l% = "")
    View_toggleFloating()
  Manager_winSet("Top", "", aWndId)
  
  WM_SYSCOMMAND = 0x112
  SC_MOVE = 0xF010
  SendMessage, WM_SYSCOMMAND, SC_MOVE, , , ahk_id %aWndId%
}

HSHELL_WINDOWCREATED := 1
; Seems to get sent sometimes when windows are deactivated.
HSHELL_WINDOWDESTROYED := 2
HSHELL_WINDOWACTIVATED := 4
; At least title change.
HSHELL_REDRAW := 6
; The following two are seen when a hung window recovers. 
; lParam notes the ghost process
HSHELL_WINDOWREPLACED := 13
; lParam notes the recovered process
;14
; Full-screen app activated? Root-privileged window activated?
HSHELL_RUDEAPPACTIVATED := 32772
; When a window is signalling an application update.
WINDOW_NOTICE := 32774

;
; Reliable messages and their meanings (note that any message may be missed if bug.n is hung):
;   1 - Window shown (shown ID)
;   2 - Window destroyed or hidden, same message for both (destroyed or hidden ID)
;   4 - Window activated via mouse, alt+tab, or hotkey (sometimes 32772, but always one of them)
;   6 - Window title change (ID of redrawn window)
;   13 - Hung window recovers and replaces ghost window (ghost window ID is provided)
;   14 - Hung window recovered (ID of previously hung window) 
;   32772 - Window activated via mouse, alt+tab, or hotkey (sometimes 4, but always one of them)
;   32774 - Window is flashing due to some event, one message for each flash
;
; Indications of:
;   New windows - cmd/shell may be starting a new window on message 6
;       Win+e indicates a new window with message 6 as long as the button
;       presses are below a certain frequency.
;       Message 1 may indicate a new window started from Windows Explorer
;       There doesn't seem to be a reliable way to get all application starts.
;   Closed windows - 13 always indicates closed ghost window
;       2 always indicates closed standard window
;   Focus change - 4 or 32772 always catch this
;   Window event - 6 indicates when title changes which can be used 
;       in the case of some applications, 32774 works for others
;
Manager_onShellMessage(wParam, lParam) {
  Local a, isChanged, aWndClass, aWndHeight, aWndId, aWndTitle, aWndWidth, aWndX, aWndY, m, t, wndClass, wndId, wndIds, wndPName, wndTitle, x, y
  
  SetFormat, Integer, hex
  lParam := lParam+0
  SetFormat, Integer, d
  
  Log_dbg_msg(2, "Manager_onShellMessage( wParam: " . wParam . ", lParam: " . lParam . " )")
  
  WinGetClass, wndClass, ahk_id %lParam%
  WinGetTitle, wndTitle, ahk_id %lParam%
  WinGet, wndPName, ProcessName, ahk_id %lParam%
  
  WinGet, aWndId, ID, A
  WinGetClass, aWndClass, ahk_id %aWndId%
  WinGetTitle, aWndTitle, ahk_id %aWndId%
  If ((wParam = 4 Or wParam = 32772) And lParam = 0 And aWndClass = "Progman" And aWndTitle = "Program Manager") {
    MouseGetPos, x, y
    m := Monitor_get(x, y)
    If m
      Manager_aMonitor := m
    Bar_updateTitle()
  }
  
  If ( wParam = HSHELL_WINDOWREPLACED ) {
    ; This shouldn't need a redraw because the window was supposedly replaced.
    Manager_unmanage(lParam)
  }
  
  If ( wParam = 14 ) {
    ; Window recovered from being hung. Maybe force a redraw.
  }
  
  If (wParam = 1 Or wParam = 2 Or wParam = 4 Or wParam = 6 Or wParam = 32772) And lParam And Not Manager_hideShow And Not Manager_focus {
    If Not (wParam = 4 Or wParam = 32772)
      If Not wndClass And Not (wParam = 2) {
        WinGetClass, wndClass, ahk_id %lParam%
        If wndClass {
          If (wndClass = "Emacs")
            Sleep, % 12 * Config_shellMsgDelay
        } Else
          Sleep, %Config_shellMsgDelay%
      }
    
    isChanged := Manager_sync(wndIds)
    If wndIds
      isChanged := False

    If a Or isChanged {
      View_arrange(Manager_aMonitor, Monitor_#%Manager_aMonitor%_aView_#1)
      Bar_updateView(Manager_aMonitor, Monitor_#%Manager_aMonitor%_aView_#1)
    }
    
    If (Manager_monitorCount > 1) {
      WinGetPos, aWndX, aWndY, aWndWidth, aWndHeight, ahk_id %aWndId%
      m := Monitor_get(aWndX + aWndWidth / 2, aWndY + aWndHeight / 2)
      If m
        Manager_aMonitor := m
    }
    
    If wndIds {
      If (Config_onActiveHiddenWnds = "view") {
        wndId := SubStr(wndIds, 1, InStr(wndIds, ";") - 1)
        Loop, % Config_viewCount
          If (Manager_#%wndId%_tags & 1 << A_Index - 1) {
            Log_dbg_msg(3, "Switching views because " . wndId . " is considered hidden and active")
            Manager_aMonitor := Manager_#%wndId%_monitor
            Monitor_activateView(A_Index)
            Break
          }
      } Else {
        StringTrimRight, wndIds, wndIds, 1
        StringSplit, wndId, wndIds, `;
        ; Otherwise re-hide them.
        If (Config_onActiveHiddenWnds = "hide") {
          Loop, % wndId0
            Manager_winHide(wndId%A_Index%)
        } Else If (Config_onActiveHiddenWnds = "tag") {
          ; Or tag all of them for the current view.
          t := Monitor_#%Manager_aMonitor%_aView_#1
          Loop, % wndId0 {
            wndId := wndId%A_Index%
            View_#%Manager_aMonitor%_#%t%_wndIds := wndId ";" View_#%Manager_aMonitor%_#%t%_wndIds
            View_#%Manager_aMonitor%_#%t%_aWndId := wndId
            Manager_#%wndId%_tags += 1 << t - 1
          }
          Bar_updateView(Manager_aMonitor, t)
          View_arrange(Manager_aMonitor, t)
        }
      }
    }
    
    Bar_updateTitle()
  }
}

Manager_registerShellHook() {
  Gui, +LastFound
  hWnd := WinExist()
  DllCall("RegisterShellHookWindow", "UInt", hWnd)  ; Minimum operating systems: Windows 2000 (http://msdn.microsoft.com/en-us/library/ms644989(VS.85).aspx)
  msgNum := DllCall("RegisterWindowMessage", "Str", "SHELLHOOK")
  OnMessage(msgNum, "Manager_onShellMessage")
}
; SKAN: How to Hook on to Shell to receive its messages? (http://www.autohotkey.com/forum/viewtopic.php?p=123323#123323)

Manager_setViewMonitor(d) {
  Local aView, m, v, wndIds
  
  If (Manager_monitorCount > 1) {
    m := Manager_loop(Manager_aMonitor, d, 1, Manager_monitorCount)
    v := Monitor_#%m%_aView_#1
    aView := Monitor_#%Manager_aMonitor%_aView_#1
    If View_#%Manager_aMonitor%_#%aView%_wndIds {
      View_#%m%_#%v%_wndIds := View_#%Manager_aMonitor%_#%aView%_wndIds View_#%m%_#%v%_wndIds
      
      StringTrimRight, wndIds, View_#%Manager_aMonitor%_#%aView%_wndIds, 1
      Loop, PARSE, wndIds, `;
      {
        Loop, % Config_viewCount {
          StringReplace, View_#%Manager_aMonitor%_#%A_Index%_wndIds, View_#%Manager_aMonitor%_#%A_Index%_wndIds, %A_LoopField%`;, 
          View_#%Manager_aMonitor%_#%A_Index%_aWndId := 0
        }
        
        Monitor_moveWindow(m, A_LoopField)
        Manager_#%A_LoopField%_tags := 1 << v - 1
      }
      View_arrange(Manager_aMonitor, aView)
      Loop, % Config_viewCount
        Bar_updateView(Manager_aMonitor, A_Index)
      
      Manager_aMonitor := m
      View_arrange(m, v)
      Bar_updateTitle()
      Bar_updateView(m, v)
    }
  }
}

Manager_setWindowMonitor(d) {
  Local aWndId, v
  
  WinGet, aWndId, ID, A
  If (Manager_monitorCount > 1 And InStr(Manager_managedWndIds, aWndId ";")) {
    Loop, % Config_viewCount {
      StringReplace, View_#%Manager_aMonitor%_#%A_Index%_wndIds, View_#%Manager_aMonitor%_#%A_Index%_wndIds, %aWndId%`;, 
      If (aWndId = View_#%Manager_aMonitor%_#%A_Index%_aWndId)
        View_#%Manager_aMonitor%_#%A_Index%_aWndId := 0
      Bar_updateView(Manager_aMonitor, A_Index)
    }
    View_arrange(Manager_aMonitor, Monitor_#%Manager_aMonitor%_aView_#1)
    
    Manager_aMonitor := Manager_loop(Manager_aMonitor, d, 1, Manager_monitorCount)
    Monitor_moveWindow(Manager_aMonitor, aWndId)
    v := Monitor_#%Manager_aMonitor%_aView_#1
    Manager_#%aWndId%_tags := 1 << v - 1
    View_#%Manager_aMonitor%_#%v%_wndIds := aWndId ";" View_#%Manager_aMonitor%_#%v%_wndIds
    View_#%Manager_aMonitor%_#%v%_aWndId := aWndId
    View_arrange(Manager_aMonitor, v)
    Bar_updateTitle()
    Bar_updateView(Manager_aMonitor, v)
  }
}

Manager_sizeWindow() {
  Local aWndId, l, SC_SIZE, v, WM_SYSCOMMAND
  
  WinGet, aWndId, ID, A
  v := Monitor_#%Manager_aMonitor%_aView_#1
  l := View_#%Manager_aMonitor%_#%v%_layout_#1
  If Not Manager_#%aWndId%_isFloating And Not (Config_layoutFunction_#%l% = "")
    View_toggleFloating()
  Manager_winSet("Top", "", aWndId)
  
  WM_SYSCOMMAND = 0x112
  SC_SIZE  = 0xF000
  SendMessage, WM_SYSCOMMAND, SC_SIZE, , , ahk_id %aWndId%
}

Manager_sync(ByRef wndIds = "") {
  Local a, flag, shownWndIds, v, visibleWndIds, wndId
  
  Loop, % Manager_monitorCount {
    v := Monitor_#%A_Index%_aView_#1
    shownWndIds .= View_#%A_Index%_#%v%_wndIds
  }
  ; check all visible windows against the known windows
  WinGet, wndId, List, , , 
  Loop, % wndId {
    If Not InStr(shownWndIds, wndId%A_Index% ";") {
      If Not InStr(Manager_managedWndIds, wndId%A_Index% ";") {
        flag := Manager_manage(Manager_aMonitor, Monitor_#%Manager_aMonitor%_aView_#1, wndId%A_Index%)
        If flag
          a := flag
      } Else If Not Manager_isHung(wndId%A_Index%) {
        ; This is a window that is already managed but was brought into focus by something. Maybe it
        ; would be useful to do something with it.
        wndIds .= wndId%A_Index% ";"
      }
    }
    visibleWndIds := visibleWndIds wndId%A_Index% ";"
  }
  
  ; check, if a window, that is known to be visible, is actually not visible
  StringTrimRight, shownWndIds, shownWndIds, 1
  Loop, PARSE, shownWndIds, `;
  {
    If Not InStr(visibleWndIds, A_LoopField) {
      flag := Manager_unmanage(A_LoopField)
      If flag
        a := flag
    }
  }
  
  Return, a
}

; No windows are known to the system yet.
; Try to do something smart with the initial layout.
Manager_initial_sync() {
  Local m, wnd, wndH, wndId, wndId0, wndIds, wndW, wndX, wndY, x, y
  
  ; Initialize lists
  ; Note that these variables make this function non-reentrant.
  Loop, % Manager_monitorCount
    Manager_initial_sync_m#%A_Index%_wndList := ""
  
  ; check all visible windows against the known windows
  WinGet, wndId, List, , , 
  Loop, % wndId {
    ; Based on some analysis here, determine which monitors and layouts would best 
    ; serve existing windows. Do not override configuration settings.
    
    ; Which monitor is it on?
    
    wnd := wndId%A_Index%
    WinGetPos, wndX, wndY, wndW, wndH, ahk_id %wnd%
    
    x := wndX + wndW/2
    y := wndY + wndH/2
    
    m := Monitor_get(x, y)
    If m > 0
      Manager_initial_sync_m#%m%_wndList .= wndId%A_Index% ";"
    
    ; @todo: What percentage of the monitor area is it occupying? (Suggest layout)
    ; @todo: What part of the monitor is it on? (Ordering of windows)
  }

  Loop, % Manager_monitorCount 
  {
    m := A_Index
    StringTrimRight, wndIds, Manager_initial_sync_m#%m%_wndList, 1
    StringSplit, wndId, wndIds, `;
    Loop, % wndId0
      Manager_manage(m, 1, wndId%A_Index%)
  }
}

Manager_toggleDecor() {
  Local aWndId
  
  WinGet, aWndId, ID, A
  Manager_#%aWndId%_isDecorated := Not Manager_#%aWndId%_isDecorated
  If Manager_#%aWndId%_isDecorated
    Manager_winSet("Style", "+0xC00000", aWndId)
  Else
    Manager_winSet("Style", "-0xC00000", aWndId)
}

Manager_unmanage(wndId) {
  Local a
  
  a := Manager_#%wndId%_tags & 1 << Monitor_#%Manager_aMonitor%_aView_#1 - 1
  Loop, % Config_viewCount
    If (Manager_#%wndId%_tags & 1 << A_Index - 1) {
      View_delWnd( Manager_aMonitor, A_Index, wndId )
      Bar_updateView(Manager_aMonitor, A_Index)
    }
  Manager_#%wndId%_monitor     :=
  Manager_#%wndId%_tags        :=
  Manager_#%wndId%_isDecorated :=
  Manager_#%wndId%_isFloating  :=
  StringReplace, Bar_hideTitleWndIds, Bar_hideTitleWndIds, %wndId%`;, 
  StringReplace, Manager_allWndIds, Manager_allWndIds, %wndId%`;, 
  StringReplace, Manager_managedWndIds, Manager_managedWndIds, %wndId%`;, , All
  
  Return, a
}

Manager_winActivate(wndId) {
  Local wndHeight, wndWidth, wndX, wndY, newWnd
  
  If Config_mouseFollowsFocus {
    If wndId {
      WinGetPos, wndX, wndY, wndWidth, wndHeight, ahk_id %wndId%
      DllCall("SetCursorPos", "Int", Round(wndX + wndWidth / 2), "Int", Round(wndY + wndHeight / 2))
    } Else
      DllCall("SetCursorPos", "Int", Round(Monitor_#%Manager_aMonitor%_x + Monitor_#%Manager_aMonitor%_width / 2), "Int", Round(Monitor_#%Manager_aMonitor%_y + Monitor_#%Manager_aMonitor%_height / 2))
  }
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winActivate: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinActivate, ahk_id %wndId%
    WinGet, newWin, ID, A
    If (wndId != newWin)
      Return 1
  }
  Bar_updateTitle()
  Return 0
}

Manager_winMove(wndId, x, y, width, height) {
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winMove: Potentially hung window " . wndId)
    Return 1
  }
  Else
    WinRestore, ahk_id %wndId%
  WM_ENTERSIZEMOVE = 0x0231
  WM_EXITSIZEMOVE  = 0x0232
  SendMessage, WM_ENTERSIZEMOVE, , , , ahk_id %wndId%
  If ErrorLevel {
    Log_dbg_msg(2, "Manager_winMove: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinMove, ahk_id %wndId%, , %x%, %y%, %width%, %height%
    SendMessage, WM_EXITSIZEMOVE, , , , ahk_id %wndId%
  }
}

Manager_winHide(wndId) {
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winHide: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinHide, ahk_id %wndId%
    Return 0
  }
}

Manager_winShow(wndId) {
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winShow: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinShow, ahk_id %wndId%
    Return 0
  }
}

Manager_winClose(wndId) {
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winClose: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinClose, ahk_id %wndId%
    Return 0
  }
}

Manager_winSet(type, value, wndId) {
  If Manager_isHung(wndId) {
    Log_dbg_msg(2, "Manager_winSet: Potentially hung window " . wndId)
    Return 1
  }
  Else {
    WinSet, %type%, %value%, ahk_id %wndId%
    Return 0
  }
}

; 0 - Not hung
; 1 - Hung
Manager_isHung(wndId) {
  Local result, detect_setting, WM_NULL
  WM_NULL := 0
  detect_setting := A_DetectHiddenWindows
  DetectHiddenWindows, On
  SendMessage, WM_NULL, , , , ahk_id %wndId%
  result := ErrorLevel
  DetectHiddenWindows, %detect_setting%
  
  If result
    Return 1
  Else
    Return 0
}

; Given a ghost window, try to find its body.
; This is only known to work on Windows 7
Manager_findHung( ghostWnd ) {
  Local expectedTitle, expectedX, expectedY, expectedW, expectedH, wndTitle, wndX, wndY, wndW, wndH, wndIds
  ;Log_dbg_msg(3, "Manager_findHung(" . ghostWnd . ")")
  WinGetTitle, expectedTitle, ahk_id %ghostWnd%
  StringReplace, expectedTitle, expectedTitle, " (Not Responding)", ""
  WinGetPos, expectedX, expectedY, expectedW, expectedH, ahk_id %ghostWnd%
  
  SetTitleMatchMode, 2
  WinGet, wndIds, List, %expectedTitle%
  Loop, % wndIds {
    If (A_Index = ghostWnd)
      Continue
    WinGetPos, wndX, wndY, wndW, wndH, % "ahk_id" wndIDs%A_Index%

    If (wndX = expectedX) And (wndY = expectedY) And (wndW = expectedW) And (wndH = expectedH)
      Return wndIds%A_Index%
  }
  Return 0
}

Manager_isGhost(wndId) {
  Local wndClass, wndProc
  
  WinGet, wndProc, ProcessName, ahk_id %wndId%
  WinGetClass, wndClass, ahk_id %wndId%
  
  If (wndProc = "dwm.exe") And (wndClass = "Ghost")
    Return 1
  Else
    Return 0
}