; PgTidy Windows installer
;
; Build with (VERSION must match the release tag, without the leading "v"):
;   makensis /DVERSION=1.2.3 /DSRC_EXE=path\to\pgtidy.exe windows\installer.nsi
;
; Installs pgtidy.exe into Program Files, adds the install dir to the
; machine-wide PATH, and on startup checks the git.warky.dev Gitea API for a
; newer release than the one being installed.

!ifndef VERSION
  !define VERSION "0.0.0"
!endif
!ifndef SRC_EXE
  !define SRC_EXE "..\dist\pgtidy.exe"
!endif

!define PRODUCT_NAME "PgTidy"
!define PRODUCT_PUBLISHER "Warky Devs"
!define PRODUCT_HOMEPAGE "https://git.warky.dev/wdevs/pgtidy"
!define RELEASES_API_URL "https://git.warky.dev/api/v1/repos/wdevs/pgtidy/releases/latest"
!define UNINST_KEY "Software\Microsoft\Windows\CurrentVersion\Uninstall\PgTidy"
!define ENV_KEY 'HKLM "SYSTEM\CurrentControlSet\Control\Session Manager\Environment"'

!include "MUI2.nsh"
!include "LogicLib.nsh"

Name "${PRODUCT_NAME} ${VERSION}"
OutFile "pgtidy-setup-${VERSION}.exe"
InstallDir "$PROGRAMFILES64\PgTidy"
InstallDirRegKey HKLM "${UNINST_KEY}" "InstallLocation"
RequestExecutionLevel admin
Unicode true

!define MUI_ABORTWARNING
!define MUI_ICON "..\assets\logo_128.ico"
!define MUI_UNICON "..\assets\logo_128.ico"

!insertmacro MUI_PAGE_WELCOME
!insertmacro MUI_PAGE_LICENSE "..\LICENSE"
!insertmacro MUI_PAGE_DIRECTORY
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_PAGE_FINISH

!insertmacro MUI_UNPAGE_CONFIRM
!insertmacro MUI_UNPAGE_INSTFILES

!insertmacro MUI_LANGUAGE "English"

; ---------------------------------------------------------------------------
; Check the Gitea releases API for a newer version than the one we are about
; to install. Best-effort only: any failure (offline, API down, no
; PowerShell) is swallowed and the installer proceeds silently.
; ---------------------------------------------------------------------------
Function .onInit
  StrCpy $1 "$TEMP\pgtidy-latest-version.txt"
  Delete "$1"

  DetailPrint "Checking ${PRODUCT_HOMEPAGE} for a newer release..."
  nsExec::ExecToLog 'powershell -NoProfile -NonInteractive -Command "try { $$r = Invoke-RestMethod -Uri ''${RELEASES_API_URL}'' -UseBasicParsing -TimeoutSec 5; $$r.tag_name | Out-File -Encoding ascii -NoNewline ''$1'' } catch { exit 0 }"'

  ${IfNot} ${FileExists} "$1"
    Return
  ${EndIf}

  FileOpen $2 "$1" r
  FileRead $2 $3
  FileClose $2
  Delete "$1"

  StrCpy $4 $3
  ; Trim a leading "v" if the tag is e.g. "v1.2.3"
  StrCpy $5 $4 1
  ${If} $5 == "v"
    StrCpy $4 $4 "" 1
  ${EndIf}

  ${If} $4 != ""
  ${AndIf} $4 != "${VERSION}"
    MessageBox MB_YESNO|MB_ICONINFORMATION \
      "A newer version of PgTidy is available: $4 (this installer is ${VERSION}).$\n$\nOpen the releases page to download it now?$\n$\nChoosing No continues installing ${VERSION}." \
      IDNO +2
    ExecShell "open" "${PRODUCT_HOMEPAGE}/releases/latest"
  ${EndIf}
FunctionEnd

; ---------------------------------------------------------------------------
; Adds $INSTDIR to the machine PATH if it isn't already present.
; ---------------------------------------------------------------------------
Function AddToPath
  ReadRegStr $0 ${ENV_KEY} "Path"
  Push "$0"
  Push "$INSTDIR"
  Call StrContains
  Pop $1
  ${If} $1 == ""
    ${If} $0 == ""
      StrCpy $0 "$INSTDIR"
    ${Else}
      StrCpy $0 "$0;$INSTDIR"
    ${EndIf}
    WriteRegExpandStr ${ENV_KEY} "Path" "$0"
    SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000
  ${EndIf}
FunctionEnd

; ---------------------------------------------------------------------------
; Removes $INSTDIR from the machine PATH.
; ---------------------------------------------------------------------------
Function un.RemoveFromPath
  ReadRegStr $0 ${ENV_KEY} "Path"
  Push "$0;"
  Push "$INSTDIR;"
  Push ""
  Call un.StrReplace
  Pop $0
  Push "$0"
  Push "$INSTDIR"
  Push ""
  Call un.StrReplace
  Pop $0
  ; Drop a trailing separator left behind by the replacements above.
  StrCpy $1 $0 1 -1
  ${If} $1 == ";"
    StrCpy $0 $0 -1
  ${EndIf}
  WriteRegExpandStr ${ENV_KEY} "Path" "$0"
  SendMessage ${HWND_BROADCAST} ${WM_WININICHANGE} 0 "STR:Environment" /TIMEOUT=5000
FunctionEnd

; Returns the index of needle in haystack via $R0, or "" if absent.
; Push haystack, Push needle -> Pop result
Function StrContains
  Exch $R1 ; needle
  Exch
  Exch $R2 ; haystack
  Push $R3
  Push $R4
  Push $R5
  StrLen $R3 $R1
  StrCpy $R4 0
  ${Do}
    StrCpy $R5 $R2 $R3 $R4
    ${If} $R5 == $R1
      StrCpy $R0 $R4
      ${ExitDo}
    ${EndIf}
    ${If} $R5 == ""
      StrCpy $R0 ""
      ${ExitDo}
    ${EndIf}
    IntOp $R4 $R4 + 1
  ${Loop}
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Push $R0
  Exch
  Pop $R0
FunctionEnd

; Push string, Push search, Push replace -> Pop result
Function un.StrReplace
  Exch $R0 ; replace
  Exch
  Exch $R1 ; search
  Exch 2
  Exch $R2 ; string
  Push $R3
  Push $R4
  Push $R5
  Push $R6
  StrLen $R3 $R1
  StrCpy $R4 ""
  ${Do}
    StrCpy $R5 $R2 $R3
    ${If} $R5 == $R1
      StrCpy $R4 "$R4$R0"
      StrCpy $R2 $R2 "" $R3
    ${ElseIf} $R2 == ""
      ${ExitDo}
    ${Else}
      StrCpy $R6 $R2 1
      StrCpy $R4 "$R4$R6"
      StrCpy $R2 $R2 "" 1
    ${EndIf}
  ${Loop}
  Pop $R6
  Pop $R5
  Pop $R4
  Pop $R3
  Pop $R2
  Pop $R1
  Pop $R0
  Push $R4
FunctionEnd

Section "PgTidy" SEC_MAIN
  SectionIn RO
  SetOutPath "$INSTDIR"
  File "${SRC_EXE}"
  File "..\LICENSE"

  Call AddToPath

  WriteRegStr HKLM "${UNINST_KEY}" "DisplayName" "${PRODUCT_NAME}"
  WriteRegStr HKLM "${UNINST_KEY}" "DisplayVersion" "${VERSION}"
  WriteRegStr HKLM "${UNINST_KEY}" "Publisher" "${PRODUCT_PUBLISHER}"
  WriteRegStr HKLM "${UNINST_KEY}" "InstallLocation" "$INSTDIR"
  WriteRegStr HKLM "${UNINST_KEY}" "UninstallString" "$INSTDIR\uninstall.exe"
  WriteRegStr HKLM "${UNINST_KEY}" "QuietUninstallString" "$INSTDIR\uninstall.exe /S"
  WriteRegDWORD HKLM "${UNINST_KEY}" "NoModify" 1
  WriteRegDWORD HKLM "${UNINST_KEY}" "NoRepair" 1

  WriteUninstaller "$INSTDIR\uninstall.exe"
SectionEnd

Section "Uninstall"
  Call un.RemoveFromPath
  Delete "$INSTDIR\pgtidy.exe"
  Delete "$INSTDIR\LICENSE"
  Delete "$INSTDIR\uninstall.exe"
  RMDir "$INSTDIR"
  DeleteRegKey HKLM "${UNINST_KEY}"
SectionEnd