#[Copyright 2023 ITwrx.
This file is part of EZ-Bkup.
EZ-Bkup is released under the General Public License 3.0.
See COPYING or <https://www.gnu.org/licenses/> for details.]#

import owlkettle
import std/osproc, std/os, std/logging
import edit_routine_dialog
import "../models/routine", "../shared"

viewable RoutineList:
  routineModel: RoutineModel
  runStatus: string
  selected: seq[RoutineId]

  # hey, hook.
  hooks:
    # yes, you, the build hook.
    build:
      # i love you. :)
      state.selected = selectedPreload()

  proc changed(state: bool)

var thread: Thread[RoutineListState]

proc rsyncThread(list: RoutineListState) {.thread.} =

  let appPath = getHomeDir() & ".ez-bkup"

  if not dirExists(appPath):
    createDir(appPath)

  var logger = newFileLogger(appPath & "/errors.log")
  
  #i'm not sure if using threadvar here is needed, but doing it just in case. :)
  var rsyncRunCmd {.threadvar.}: string
  var rsyncRun {.threadvar.}: tuple[output: string, exitCode: int]
  var rsyncCheckCmd {.threadvar.}: string
  var rsyncCheckRun {.threadvar.}: tuple[output: string, exitCode: int]

  var rsyncErrors: seq[string]
  var routineRunCount: int
  routineRunCount = 0
  for routine in list.routineModel.routineSeq():
    if routine.id in list.selected:
      #skip routines that don't have at least one source and one destination.
      if routine.sources.len != 0 and routine.destinations.len != 0:
        list.runStatus = "<span color=\"#FFE97B\" size=\"large\">Horses, please to be holding...</span>"
        routineRuncount += 1
        for source in routine.sources:
          for destination in routine.destinations:
            #try without requiring superuser privs by default.
            rsyncRunCmd = "rsync -aq " & source & " " & destination
            rsyncRun = execCmdEx(rsyncRunCmd)
            if rsyncRun.exitCode != 0:
              #handle permission denied error.
              if rsyncRun.exitCode == 23:
                rsyncRun.exitCode = 0
                if getAskPassPath() == "":
                  let err = "No ssh-askpass binary found. Please install an ssh-askpass package for your distro, and let us know if EZ-Bkup still can't detect it's location."
                  rsyncErrors.add(err)
                else:
                  rsyncRunCmd = "SUDO_ASKPASS=" & getAskPassPath() & " sudo -A rsync -aq " & source & " " & destination                  
                  rsyncRun = execCmdEx(rsyncRunCmd)
                  if rsyncRun.exitCode != 0:
                    rsyncErrors.add("EZ-Bkup's rsync process(es) returned error (" & $rsyncRun.output & ") while attempting to back up " & source & " to " & destination)
              #handle non-perms related error.
              else:
                rsyncErrors.add("EZ-Bkup's rsync process(es) returned error (" & $rsyncRun.output & ") while attempting to back up " & source & " to " & destination)
            #explicitly check that sources were copied to destinations.
            #just using file names, mod times, and size (same as bkup run itself).    
            rsyncCheckCmd = "rsync -rn " & source & " " & destination
            rsyncCheckRun = execCmdEx(rsyncCheckCmd)
            if rsyncCheckRun.exitCode != 0:
              #handle permission denied error.
              if rsyncCheckRun.exitCode == 23:
                rsyncCheckRun.exitCode = 0
                if getAskPassPath() == "":
                  let err = "No ssh-askpass binary found. Please install an ssh-askpass package for your distro, and let us know if EZ-Bkup still can't detect it's location."
                  rsyncErrors.add(err)
                else:                  
                  rsyncCheckCmd = "SUDO_ASKPASS=" & getAskPassPath() & " sudo -A rsync -rn " & source & " " & destination                  
                  rsyncCheckRun = execCmdEx(rsyncCheckCmd)
                  if rsyncCheckRun.exitCode != 0:
                    rsyncErrors.add("EZ-Bkup's rsync process(es) returned error (" & $rsyncRun.output & ") while attempting to verify that " & source & " got backed up to " & destination)
              #handle non-perms related error.
              else:
                rsyncErrors.add("EZ-Bkup's rsync process(es) returned error (" & $rsyncRun.output & ") while attempting to verify that " & source & " got backed up to " & destination)

  if rsyncErrors.len > 0:
    list.runStatus = "<span color=\"#ff6b6b\" size=\"large\">Error! Please see ~/.ez-bkup/errors.log</span>"
    for err in rsyncErrors:
      logger.log(lvlError, err)
  elif routineRunCount == 0:
    list.runStatus = "<span color=\"#FFA651\" size=\"large\">Meh. No Bkup Routines were run.</span>"
  else:
    list.runStatus = "<span color=\"#6fffa3\" size=\"large\">Bkup Complete!</span>"             

  list.redrawFromThread()

method view(list: RoutineListState): Widget =
  result = gui:    
    ScrolledWindow:   
      Box:
        orient = OrientY
        if list.routineModel.routineSeq().len() > 0:   
          ListBox:                  
            for it, routine in list.routineModel.routineSeq():        
              Box:
                orient = OrientY
                margin = 6
                spacing = 6              
                Box:
                  orient = OrientX
                  margin = 6
                  spacing = 6
                  Switch {.expand: false, vAlign: AlignCenter.}:
                    state = routine.selByDef
                    tooltip = "Enable/Disable this Routine for the current Bkup run."
                    proc changed(state: bool) =
                      if state == true:
                        list.selected.add(routine.id)
                      else: 
                        let index = list.selected.find(routine.id)
                        if index != -1:
                          list.selected.delete(index)

                      if not list.changed.isNil:
                        list.changed.callback(true)                      
                  Label:
                    text = "<span size=\"large\">" & routine.name & "</span>"
                    xAlign = 0 
                    useMarkup = true                      
                  # Edit Button            
                  Button {.expand: false.}:
                    #icon = "entity-edit"
                    icon = "entity-edit-dark-theme"
                    tooltip = "Edit this Routine."                      
                    proc clicked() =
                      ## Opens the EditRoutineDialog for updating the existing routine                
                      let (res, state) = list.app.open: gui:
                        EditRoutineDialog:
                          routine = routine
                          mode = EditRoutineUpdate                          
                      if res.kind == DialogAccept:
                        # The "Update" button was clicked
                        list.routineModel.update(EditRoutineDialogState(state).routine)                      
                  # Delete Button            
                  Button {.expand: false.}:
                    icon = "user-trash-symbolic" 
                    tooltip = "Delete this Routine. Warning: will not ask you to confirm."                     
                    proc clicked() =
                      list.routineModel.delete(routine.id)
                if routine.id in list.selected:
                  Box:
                    orient = OrientY
                    margin = 6
                    spacing = 6
                    Label:
                      text = "<span color=\"#6fffa3\">Sources:</span>"
                      xAlign = 0
                      useMarkup = true
                    #routineSeq returns an empty string when no sources exist.
                    if routine.sources.len != 0:
                      for it, routineSource in routine.sources:                      
                        Box:
                          orient = OrientX
                          spacing = 6
                          margin = 6
                          Label:
                            text = routineSource  
                            xAlign = 0
                    else:
                      Box:
                        orient = OrientX
                        spacing = 6
                        margin = 6
                        Label:
                          text = "<span color=\"#ff6b6b\">Routine will be ignored. Source required.</span>" 
                          xAlign = 0
                          useMarkup = true
                    Label:
                      text = "<span color=\"#6fffa3\">Destinations:</span>"
                      xAlign = 0    
                      useMarkup = true 
                    #routineSeq returns an empty string when no destinations exist.
                    if routine.destinations.len != 0:                   
                      for it, routineDestination in routine.destinations:                      
                        Box:
                          orient = OrientX
                          spacing = 6
                          margin = 6
                          Label:
                            text = routineDestination 
                            xAlign = 0 
                    else:
                      Box:
                        orient = OrientX
                        spacing = 6
                        margin = 6
                        Label:
                          text = "<span color=\"#ff6b6b\">Routine will be ignored. Destination required.</span>" 
                          xAlign = 0
                          useMarkup = true
          Box {.expand: false.}:
            orient = OrientX
            spacing = 6
            margin = 6
            Label {.expand: false.}:
              text = "<span size=\"large\">Status: </span>" 
              xAlign = 0
              useMarkup = true
            Label:
              if list.runStatus != "":
                text = list.runStatus 
              else:
                text = "<span color=\"#6AC9FF\" size=\"large\">Waiting patiently...</span>"
              xAlign = 0 
              margin = 6
              useMarkup = true
            # Run Button            
            Button {.expand: false.}:
              Box:
                orient = OrientX
                spacing = 6
                margin = 6
                Icon:
                  name = "media-floppy"
                  pixelSize = 40   
                  margin = 4
                Label {.expand: false.}:
                  text = "<span size=\"large\">Run Bkup!</span>" 
                  xAlign = 0 
                  useMarkup = true         
              proc clicked() =
                #check that every source and destination exists for each routine or don't run bkup and show err status.
                #locations not found will be logged. see routine.nim
                var allLocationsExist: seq[bool]
                for routine in list.routineModel.routineSeq():
                  if routine.id in list.selected:
                    if locationsExist(routine) == true:
                      allLocationsExist.add(true)
                    else:
                      allLocationsExist.add(false)
                if false in allLocationsExist:
                  #show error status.
                  list.runStatus = "<span color=\"#ff6b6b\" size=\"large\">Missing Source(s)/Destination(s) in selected Routine(s).</span>"
                else:
                  createThread(thread, rsyncThread, list)                                
        else:
          Box {.expand: false.}:
            orient = OrientY
            margin = 6
            spacing = 12
            Label:
              text = "<span size=\"large\">You don't have any Bkup Routines!!! 🙂</span>"
              xAlign = 0
              useMarkup = true
            Label:
              text = "<span size=\"large\">Please click on the + Routine button above to create your first Routine.</span>"
              xAlign = 0
              useMarkup = true
export RoutineList