import QtQuick
import Quickshell
import Quickshell.Hyprland
import Quickshell.Io
import Quickshell.Wayland

Item {
  id: root

  // Injected by omarchy-shell (the first-party service loader).
  property var shell: null

  readonly property int defaultScreensaverSeconds: 150
  readonly property int defaultLockSeconds: 300
  readonly property var idleConfig: shell && shell.shellConfig && shell.shellConfig.idle ? shell.shellConfig.idle : ({})
  readonly property int screensaverTimeoutSeconds: secondsFromConfig(idleConfig.screensaver, defaultScreensaverSeconds)
  readonly property int lockTimeoutSeconds: secondsFromConfig(idleConfig.lock, defaultLockSeconds)
  readonly property int firstIdleTimeoutSeconds: Math.min(screensaverTimeoutSeconds, lockTimeoutSeconds)
  readonly property int screensaverDelaySeconds: Math.max(0, screensaverTimeoutSeconds - firstIdleTimeoutSeconds)
  readonly property int lockDelaySeconds: Math.max(0, lockTimeoutSeconds - firstIdleTimeoutSeconds)
  readonly property bool idleEnabled: persisted.idleEnabled
  readonly property string screensaverClass: "org.omarchy.screensaver"

  property bool idledThisCycle: false
  property bool screensaverStartedThisCycle: false
  property string lastEvent: "starting"
  property string lastEventAt: ""
  property var screensaverWindows: ({})
  property int screensaverWindowCount: 0

  PersistentProperties {
    id: persisted
    reloadableId: "omarchy-idle"
    property bool idleEnabled: true
  }

  function secondsFromConfig(value, fallback) {
    var n = Number(value)
    if (!isFinite(n) || n < 0) return fallback
    return Math.floor(n)
  }

  function nowIso() {
    return new Date().toISOString()
  }

  function logEvent(event, details) {
    var suffix = details === undefined || details === null || details === "" ? "" : ": " + String(details)
    root.lastEventAt = nowIso()
    root.lastEvent = event + suffix
    console.log("omarchy idle " + root.lastEventAt + " " + root.lastEvent)
  }

  function runProcess(process, label, command) {
    if (process.running) {
      logEvent("process-skip", label + " already running")
      return false
    }
    logEvent("process-start", label + " " + command)
    process.command = ["bash", "-lc", command]
    process.running = true
    return true
  }

  function launchScreensaver() {
    root.screensaverStartedThisCycle = true
    screensaverLaunchGraceTimer.restart()
    runProcess(screensaverProcess, "screensaver", "[[ $(omarchy-shell lock isLocked 2>/dev/null) == \"true\" ]] || omarchy-launch-screensaver")
  }

  function lockSystem(reason) {
    logEvent("lock-system", reason || "requested")
    screensaverTimer.stop()
    lockTimer.stop()
    screensaverLaunchGraceTimer.stop()
    root.idledThisCycle = false
    root.screensaverStartedThisCycle = false
    resetScreensaverWindows()
    runProcess(lockProcess, "lock", "omarchy-system-lock")
  }

  function startIdleCycle() {
    if (root.idledThisCycle) {
      logEvent("idle-cycle-already-running")
      return
    }

    logEvent("idle-cycle-start", "screensaver=" + root.screensaverTimeoutSeconds + " lock=" + root.lockTimeoutSeconds)
    root.idledThisCycle = true
    root.screensaverStartedThisCycle = false
    resetScreensaverWindows()

    if (root.screensaverDelaySeconds === 0) launchScreensaver()
    else screensaverTimer.restart()

    if (root.lockDelaySeconds === 0) lockSystem("lock-timeout-immediate")
    else lockTimer.restart()
  }

  function cancelIdleCycle(reason) {
    logEvent("idle-cycle-cancel", reason || "requested")
    screensaverTimer.stop()
    lockTimer.stop()
    screensaverLaunchGraceTimer.stop()

    if (root.idledThisCycle) runProcess(wakeProcess, "wake", "omarchy-system-wake")

    root.idledThisCycle = false
    root.screensaverStartedThisCycle = false
    resetScreensaverWindows()
  }

  function resetScreensaverWindows() {
    root.screensaverWindows = ({})
    root.screensaverWindowCount = 0
  }

  function setScreensaverWindow(address, visible) {
    var key = String(address || "")
    if (!key) return

    var next = {}
    var count = 0
    for (var existing in root.screensaverWindows) {
      if (existing !== key && root.screensaverWindows[existing]) {
        next[existing] = true
        count++
      }
    }

    if (visible) {
      next[key] = true
      count++
    }

    root.screensaverWindows = next
    root.screensaverWindowCount = count
  }

  function handleScreensaverWindowOpened(address) {
    setScreensaverWindow(address, true)
    screensaverLaunchGraceTimer.stop()
  }

  function handleScreensaverWindowClosed(address) {
    setScreensaverWindow(address, false)

    if (!root.idleEnabled || !root.idledThisCycle || !root.screensaverStartedThisCycle) return
    if (root.screensaverWindowCount > 0) return

    // The user dismissed the screensaver before the lock deadline. Treat that
    // as activity and cancel the pending lock; the lock timer is only allowed
    // to fire while the screensaver remains up.
    root.cancelIdleCycle("screensaver-dismissed")
  }

  function eventParts(event, count) {
    try {
      if (event && event.parse) return event.parse(count)
    } catch (error) {}
    return String(event && event.data ? event.data : "").split(",")
  }

  function handleHyprlandEvent(event) {
    var name = String(event && event.name ? event.name : "")
    if (name === "openwindow") {
      var open = eventParts(event, 4)
      if (String(open[2] || "") === root.screensaverClass) root.handleScreensaverWindowOpened(open[0])
    } else if (name === "closewindow") {
      var close = eventParts(event, 1)
      var address = String(close[0] || "")
      if (root.screensaverWindows[address]) root.handleScreensaverWindowClosed(address)
    }
  }

  function handleActiveSignal() {
    if (!root.idledThisCycle) return

    // Starting the screensaver can make the compositor report activity. Keep
    // the lock timer running once the screensaver exists (or during its short
    // launch grace); Hyprland window events cancel the cycle if it exits before
    // the normal lock deadline.
    if (root.screensaverStartedThisCycle && (root.screensaverWindowCount > 0 || screensaverLaunchGraceTimer.running)) {
      logEvent("idle-monitor-active", "screensaver cycle remains armed")
      return
    }

    cancelIdleCycle("activity")
  }

  function handleIdleChanged() {
    logEvent("idle-monitor", idleMonitor.isIdle ? "idle" : "active")
    if (!root.idleEnabled) return

    if (idleMonitor.isIdle) startIdleCycle()
    else handleActiveSignal()
  }

  function statusJson() {
    return JSON.stringify({
      enabled: root.idleEnabled,
      idle: idleMonitor.isIdle,
      inIdleCycle: root.idledThisCycle,
      screensaverStarted: root.screensaverStartedThisCycle,
      screensaver: root.screensaverTimeoutSeconds,
      lock: root.lockTimeoutSeconds,
      screensaverDelay: root.screensaverDelaySeconds,
      lockDelay: root.lockDelaySeconds,
      screensaverWindows: root.screensaverWindowCount,
      timers: {
        screensaver: screensaverTimer.running,
        lock: lockTimer.running,
        screensaverLaunchGrace: screensaverLaunchGraceTimer.running
      },
      processes: {
        screensaver: screensaverProcess.running,
        lock: lockProcess.running,
        wake: wakeProcess.running
      },
      lastEvent: root.lastEvent,
      lastEventAt: root.lastEventAt
    })
  }

  function setIdleEnabled(value) {
    var enabled = !!value
    if (persisted.idleEnabled === enabled) return enabled ? "enabled" : "disabled"

    persisted.idleEnabled = enabled
    logEvent("idle-enabled", enabled ? "enabled" : "disabled")
    if (!enabled) cancelIdleCycle("disabled")
    else Qt.callLater(root.handleIdleChanged)

    return enabled ? "enabled" : "disabled"
  }

  IdleMonitor {
    id: idleMonitor
    enabled: root.idleEnabled
    timeout: root.firstIdleTimeoutSeconds
    respectInhibitors: true
    onIsIdleChanged: root.handleIdleChanged()
  }

  Timer {
    id: screensaverTimer
    interval: root.screensaverDelaySeconds * 1000
    repeat: false
    onTriggered: root.launchScreensaver()
  }

  Timer {
    id: lockTimer
    interval: root.lockDelaySeconds * 1000
    repeat: false
    onTriggered: if (root.idleEnabled && root.idledThisCycle) root.lockSystem("lock-timeout")
  }

  Timer {
    id: screensaverLaunchGraceTimer
    interval: 3000
    repeat: false
    onTriggered: {
      if (root.idleEnabled && root.idledThisCycle && root.screensaverStartedThisCycle && root.screensaverWindowCount === 0 && !idleMonitor.isIdle) {
        root.cancelIdleCycle("screensaver-not-running")
      }
    }
  }

  Connections {
    target: Hyprland
    function onRawEvent(event) { root.handleHyprlandEvent(event) }
  }

  Process {
    id: screensaverProcess
    onExited: function(exitCode, exitStatus) { root.logEvent("process-exit", "screensaver exitCode=" + exitCode + " status=" + exitStatus) }
  }
  Process {
    id: lockProcess
    onExited: function(exitCode, exitStatus) { root.logEvent("process-exit", "lock exitCode=" + exitCode + " status=" + exitStatus) }
  }
  Process {
    id: wakeProcess
    onExited: function(exitCode, exitStatus) { root.logEvent("process-exit", "wake exitCode=" + exitCode + " status=" + exitStatus) }
  }

  Component.onCompleted: {
    logEvent("service-ready")
    Qt.callLater(root.handleIdleChanged)
  }

  IpcHandler {
    target: "idle"

    function status(): string {
      return root.statusJson()
    }

    function debug(): string {
      return root.statusJson()
    }

    function enable(): string {
      return root.setIdleEnabled(true)
    }

    function disable(): string {
      return root.setIdleEnabled(false)
    }

    function toggle(): string {
      return root.setIdleEnabled(!root.idleEnabled)
    }
  }
}