pragma Singleton

import QtQuick
import Quickshell
import Quickshell.Io
import qs.Commons

// Service to check if various programs are available on the system
Singleton {
  id: root

  // Program availability properties
  property bool matugenAvailable: false
  property bool pywalfoxAvailable: false
  property bool kittyAvailable: false
  property bool ghosttyAvailable: false
  property bool footAvailable: false
  property bool fuzzelAvailable: false
  property bool vesktopAvailable: false
  property bool gpuScreenRecorderAvailable: false

  // Signal emitted when all checks are complete
  signal checksCompleted

  // Programs to check - maps property names to commands
  readonly property var programsToCheck: ({
                                            "matugenAvailable": ["which", "matugen"],
                                            "pywalfoxAvailable": ["which", "pywalfox"],
                                            "kittyAvailable": ["which", "kitty"],
                                            "ghosttyAvailable": ["which", "ghostty"],
                                            "footAvailable": ["which", "foot"],
                                            "fuzzelAvailable": ["which", "fuzzel"],
                                            "vesktopAvailable": ["which", "vesktop"],
                                            "gpuScreenRecorderAvailable": ["sh", "-c", "command -v gpu-screen-recorder >/dev/null 2>&1 || (command -v flatpak >/dev/null 2>&1 && flatpak list --app | grep -q 'com.dec05eba.gpu_screen_recorder')"]
                                          })

  // Internal tracking
  property int completedChecks: 0
  property int totalChecks: Object.keys(programsToCheck).length

  // Single reusable Process object
  Process {
    id: checker
    running: false

    property string currentProperty: ""

    onExited: function (exitCode) {
      // Set the availability property
      root[currentProperty] = (exitCode === 0)

      // Stop the process to free resources
      running = false

      // Track completion
      root.completedChecks++

      // Check next program or emit completion signal
      if (root.completedChecks >= root.totalChecks) {
        root.checksCompleted()
      } else {
        root.checkNextProgram()
      }
    }

    stdout: StdioCollector {}
    stderr: StdioCollector {}
  }

  // Queue of programs to check
  property var checkQueue: []
  property int currentCheckIndex: 0

  // Function to check the next program in the queue
  function checkNextProgram() {
    if (currentCheckIndex >= checkQueue.length)
      return

    var propertyName = checkQueue[currentCheckIndex]
    var command = programsToCheck[propertyName]

    checker.currentProperty = propertyName
    checker.command = command
    checker.running = true

    currentCheckIndex++
  }

  // Function to run all program checks
  function checkAllPrograms() {
    // Reset state
    completedChecks = 0
    currentCheckIndex = 0
    checkQueue = Object.keys(programsToCheck)

    // Start first check
    if (checkQueue.length > 0) {
      checkNextProgram()
    }
  }

  // Function to check a specific program
  function checkProgram(programProperty) {
    if (!programsToCheck.hasOwnProperty(programProperty)) {
      Logger.warn("ProgramChecker", "Unknown program property:", programProperty)
      return
    }

    checker.currentProperty = programProperty
    checker.command = programsToCheck[programProperty]
    checker.running = true
  }

  // Initialize checks when service is created
  Component.onCompleted: {
    checkAllPrograms()
  }
}