Page custom StackSelectCreate StackSelectLeave " - Select stack"

Function StackSelectCreate
  ; Only show this page if both WAMPStack and WAPPStack are installed.
  StrCmp $wampstack_installed 0 "" +3
    Call StackSelectLeave
    Return
  StrCmp $wappstack_installed 0 "" +3
    Call StackSelectLeave
    Return
  StrCmp $XPUI_ABORTED 1 "" +2
    Abort
    
  !insertmacro XPUI_INSTALLOPTIONS_EXTRACT_AS "pages\StackSelect.ini" "StackSelect.ini"
  !insertmacro XPUI_HEADER_TEXT "Select server stack" "Choose which BitNami stack installation you want to use to run $(^Name)."
  !insertmacro XPUI_INSTALLOPTIONS_DISPLAY "StackSelect.ini"
FunctionEnd

Function StackSelectLeave
  ; Here is where we make the final decision on which stack will be used.
  IfFileExists "$PLUGINSDIR\StackSelect.ini" "" OnlyOneStackInstalled
  
    !macro ConfigCheck
      IfFileExists "$stack_instdir\apps\${PRODUCT_SHORTNAME}\htdocs\config.php" 0 +3
        MessageBox MB_YESNO|MB_ICONQUESTION|MB_DEFBUTTON2 "Setup has found that $(^Name) is already installed on this stack. If you continue, the existing installation's configuration file will be deleted and your existing website will be replaced with a fresh one.$\n$\nDo you want to delete your existing $(^Name) website?" IDYES +2
          Abort
    !macroend
  
    ; Both stacks are installed; decide based on user selection
    ReadINIStr $0 "$PLUGINSDIR\StackSelect.ini" "Field 1" "State"
    StrCmp $0 1 "" UserSelectedWAPP
      ; User selected WAMP
      Call BNSetVarsForWAMP
      !insertmacro ConfigCheck
      Return
      
    UserSelectedWAPP:
      ; User selected WAPP
      Call BNSetVarsForWAPP
      !insertmacro ConfigCheck
      Return
  
  OnlyOneStackInstalled:
  StrCmp $wampstack_installed 0 +3
    ; MySQL
    Call BNSetVarsForWAMP
    !insertmacro ConfigCheck
    Return
    
    ; PostgreSQL
    Call BNSetVarsForWAPP
    !insertmacro ConfigCheck
    Return
FunctionEnd

Function BNSetVarsForWAMP
  StrCpy $stack_type "WAMP"
  StrCpy $stack_instdir "$wampstack_installed"
  StrCpy $db_driver "mysql"
  StrCpy $db_dbmsname "MySQL"
  StrCpy $db_rootuser "root"
  ReadINIStr $db_port "$stack_instdir\properties.ini" "MySQL" "mysql_port"
  
  StrCpy $stack_portbit ""
  ReadINIStr $0 "$stack_instdir\properties.ini" "Apache" "apache_server_port"
  StrCmp $0 "80" +2
    StrCpy $stack_portbit ":$0"
FunctionEnd

Function BNSetVarsForWAPP
  StrCpy $stack_type "WAPP"
  StrCpy $stack_instdir "$wappstack_installed"
  StrCpy $db_driver "postgresql"
  StrCpy $db_dbmsname "PostgreSQL"
  StrCpy $db_rootuser "postgres"
  ; NOTE: WAPPStack doesn't record the port of PostgreSQL - we have to assume the default
  StrCpy $db_port 5432
  
  StrCpy $stack_portbit ""
  ReadINIStr $0 "$stack_instdir\properties.ini" "Apache" "apache_server_port"
  StrCmp $0 "80" +2
    StrCpy $stack_portbit ":$0"
FunctionEnd