import QtQuick
import QtQuick.Controls
import Quickshell
import Quickshell.Io
import qs.Ui
import qs.Commons
import "Model.js" as Model

Panel {
  id: root
  moduleName: "omarchy.monitor"
  ipcTarget: "omarchy.monitor"
  manageIpc: false

  // manageIpc: false so this panel can own the single IpcHandler the target
  // permits — needed for the brightness + state methods below.
  property int brightnessPercent: 0
  property int pendingBrightnessPercent: 0
  property bool brightnessSetQueued: false
  property bool brightnessAvailable: false
  property string internalMonitor: ""
  property string externalMonitor: ""
  property string focusedMonitor: ""
  property bool internalEnabled: false
  property bool mirrorEnabled: false
  property string monitorScale: ""
  property var displays: []
  property int enabledDisplayCount: 0

  // Cursor model shared by keyboard and mouse. Sections:
  //   "brightness" - single slider row, selectedIndex = -1 sentinel
  //                  (mirrors Audio's slider rows). Only present if a
  //                  controllable backlight was detected.
  //   "scale"      - 6 Button scale presets; treated as a single
  //                  horizontal row from j/k's perspective. h/l moves
  //                  between presets, identical to bluetooth's header.
  //   "monitors"   - vertical display row list for enabling/disabling displays;
  //                  j/k walks each row.
  // Mouse hover on a target updates root state via the components' `hovered`
  // signal so keyboard cursor and pointer share one highlight.
  readonly property var scaleValues: ["1", "1.25", "1.6", "2", "3", "4"]
  property string focusSection: "scale"
  property int selectedIndex: 0
  property bool cursorActive: false

  readonly property var visibleSections: {
    var list = []
    if (brightnessAvailable) list.push("brightness")
    list.push("scale")
    if (displays.length > 1) list.push("monitors")
    return list
  }

  function sectionCount(section) {
    if (section === "brightness") return 0  // only the slider sentinel at -1
    if (section === "scale") return scaleValues.length
    if (section === "monitors") return displays.length
    return 0
  }

  function sectionIsSingleRow(section) {
    // brightness has only the slider; scale presets sit horizontally.
    return section === "brightness" || section === "scale"
  }

  function sectionFirstIndex(section) {
    if (section === "brightness") return -1
    return 0
  }

  function moveCursor(delta) {
    var sections = visibleSections
    if (!sections || sections.length === 0) return
    var sIdx = sections.indexOf(focusSection)
    if (sIdx < 0) {
      focusSection = sections[0]
      selectedIndex = sectionFirstIndex(focusSection)
      return
    }
    var inSingleRow = sectionIsSingleRow(focusSection)
    var max = inSingleRow ? 0 : sectionCount(focusSection) - 1

    if (delta > 0) {
      if (!inSingleRow && selectedIndex < max) { selectedIndex = selectedIndex + 1; return }
      if (sIdx < sections.length - 1) {
        focusSection = sections[sIdx + 1]
        selectedIndex = sectionFirstIndex(focusSection)
      }
    } else {
      if (!inSingleRow && selectedIndex > 0) { selectedIndex = selectedIndex - 1; return }
      if (sIdx > 0) {
        var prev = sections[sIdx - 1]
        focusSection = prev
        // Coming up from below — land on the last navigable row of the prev
        // section, or its sentinel for single-row sections.
        selectedIndex = sectionIsSingleRow(prev) ? sectionFirstIndex(prev) : sectionCount(prev) - 1
      }
    }
  }

  // h/l: in scale section, walks the preset row; everywhere else, no-op
  // because adjustBrightness handles horizontal motion on the brightness
  // slider.
  function moveCursorH(delta) {
    if (focusSection !== "scale") return
    var next = selectedIndex + delta
    if (next < 0) next = 0
    if (next > scaleValues.length - 1) next = scaleValues.length - 1
    selectedIndex = next
  }

  function adjustBrightness(delta) {
    if (focusSection !== "brightness") return
    if (!brightnessAvailable) return
    setBrightness(root.brightnessPercent + delta)
  }

  function activateCursor() {
    if (focusSection === "scale" && selectedIndex >= 0 && selectedIndex < scaleValues.length) {
      setScale(scaleValues[selectedIndex])
      return
    }
    if (focusSection === "monitors" && selectedIndex >= 0 && selectedIndex < displays.length) {
      var d = displays[selectedIndex]
      if (d) toggleDisplay(d.name, d.enabled)
    }
    // brightness: no separate action; the slider value is the action.
  }

  function clampCursor() {
    var sections = visibleSections
    if (!sections || !sections.length) return
    if (sections.indexOf(focusSection) < 0) {
      focusSection = sections[0]
      selectedIndex = sectionFirstIndex(focusSection)
      return
    }
    var count = sectionCount(focusSection)
    if (sectionIsSingleRow(focusSection)) {
      // brightness uses -1 sentinel; scale clamps into the preset range.
      if (focusSection === "brightness") selectedIndex = -1
      else if (selectedIndex < 0 || selectedIndex >= count) selectedIndex = 0
      return
    }
    if (count === 0) {
      var sIdx = sections.indexOf(focusSection)
      focusSection = sIdx > 0 ? sections[sIdx - 1] : sections[0]
      selectedIndex = sectionFirstIndex(focusSection)
      return
    }
    if (selectedIndex > count - 1) selectedIndex = count - 1
    if (selectedIndex < 0) selectedIndex = 0
  }

  // Keep the keyboard-focused row inside the viewport when the panel grows
  // taller than its allotted height (lots of displays). Mirrors audio's
  // ensureCursorVisible helper.
  function ensureCursorVisible(item) {
    if (!item || !scrollArea) return
    var flick = scrollArea.contentItem
    if (!flick || flick.contentY === undefined) return
    var pt = item.mapToItem(flick.contentItem || flick, 0, 0)
    var top = pt.y
    var bottom = top + (item.height || 0)
    var viewTop = flick.contentY
    var viewBottom = viewTop + flick.height
    var margin = 6
    if (top < viewTop + margin) flick.contentY = Math.max(0, top - margin)
    else if (bottom > viewBottom - margin)
      flick.contentY = bottom + margin - flick.height
  }

  function brightnessIpc(percent) {
    var value = Number(percent)
    root.setBrightness(value)
    return "got " + root.pendingBrightnessPercent
  }

  function stateIpc() {
    return JSON.stringify({
      brightness: root.brightnessPercent,
      brightnessAvailable: root.brightnessAvailable,
      focusedMonitor: root.focusedMonitor,
      scale: root.monitorScale,
      displays: root.displays
    })
  }

  IpcHandler {
    target: "omarchy.monitor"

    function brightness(percent: string): string { return root.brightnessIpc(percent) }
    function state(): string { return root.stateIpc() }
    function open() { root.open() }
    function close() { root.close() }
    function toggle() { root.toggle() }
    function show() { root.open() }
    function hide() { root.close() }
  }

  function refresh() {
    if (!stateProc.running) stateProc.running = true
  }

  function setBrightness(value) {
    var percent = Model.clampBrightness(value)
    root.brightnessPercent = percent
    root.pendingBrightnessPercent = percent

    if (setBrightnessProc.running) {
      root.brightnessSetQueued = true
      return
    }

    root.brightnessSetQueued = false
    setBrightnessProc.command = ["bash", "-lc", "omarchy-brightness-display --no-osd " + percent + "%"]
    setBrightnessProc.running = true
  }

  function previewBrightness(value) {
    root.brightnessPercent = Model.clampBrightness(value)
    brightnessDebounce.restart()
  }

  function normalizeScale(scale) {
    return Model.normalizeScale(scale)
  }

  // Playful mood-name for a given brightness percent. Bands intentionally
  // span ~10–20 points so casual tweaks change the label, while small
  // nudges within one band don't.
  function brightnessName(percent) {
    return Model.brightnessName(percent)
  }

  function updateDisplays(displaysJson) {
    var parsed = Model.parseDisplays(displaysJson)
    root.displays = parsed.displays
    root.enabledDisplayCount = parsed.enabledDisplayCount
  }

  function toggleDisplay(name, enabled) {
    if (!name) return
    if (enabled && root.enabledDisplayCount <= 1) return

    actionProc.command = ["hyprctl", "keyword", "monitor", name + (enabled ? ",disable" : ",preferred,auto,auto")]
    if (!actionProc.running) actionProc.running = true
  }

  function setScale(scale) {
    actionProc.command = ["bash", "-lc", "omarchy-hyprland-monitor-scaling " + scale]
    if (!actionProc.running) actionProc.running = true
  }

  implicitWidth: button.implicitWidth
  implicitHeight: button.implicitHeight

  Component.onCompleted: refresh()

  // KeyboardPanel takes Exclusive focus at map-time, so SUPER-bound IPC
  // summons land with j/k ready to navigate. Keep a default landing point,
  // but don't paint the cursor until hover or the first navigation key.
  onOpenedChanged: {
    if (opened) {
      refresh()
      if (brightnessAvailable) {
        focusSection = "brightness"
        selectedIndex = -1
      } else {
        focusSection = "scale"
        selectedIndex = 0
      }
      cursorActive = false
    }
  }

  onBrightnessAvailableChanged: clampCursor()
  onDisplaysChanged: clampCursor()
  onVisibleSectionsChanged: clampCursor()

  Timer {
    interval: 5000
    running: true
    repeat: true
    onTriggered: root.refresh()
  }

  Process {
    id: stateProc
    command: [root.bar ? root.bar.omarchyPath + "/bin/omarchy-monitor-state" : "omarchy-monitor-state"]
    stdout: StdioCollector {
      waitForEnd: true
      onStreamFinished: {
        var lines = String(text || "").split("\n")
        var brightness = String(lines[0] || "").trim()
        root.brightnessAvailable = brightness !== "unavailable" && brightness !== ""
        root.brightnessPercent = root.brightnessAvailable ? Math.max(0, Math.min(100, parseInt(brightness, 10))) : 0
        root.internalMonitor = String(lines[1] || "").trim()
        root.externalMonitor = String(lines[2] || "").trim()
        root.internalEnabled = String(lines[3] || "").trim() !== ""
        root.mirrorEnabled = String(lines[4] || "").trim() === root.externalMonitor && root.externalMonitor !== ""
        root.focusedMonitor = String(lines[5] || "").trim()
        root.monitorScale = root.normalizeScale(String(lines[6] || "").trim())
        root.updateDisplays(String(lines[7] || "[]").trim())
      }
    }
  }

  Timer {
    id: brightnessDebounce
    interval: 180
    repeat: false
    onTriggered: root.setBrightness(root.brightnessPercent)
  }

  Process {
    id: setBrightnessProc
    stdout: StdioCollector { waitForEnd: true }
    // Do NOT call refresh() after a brightness set completes. The local
    // brightnessPercent we just wrote is authoritative; re-reading via
    // `omarchy-brightness-display` races the hardware/driver and can
    // return an empty string, which the parser then coerces to 0 —
    // visible as a "bounce to zero" after h/l keypresses. External
    // brightness changes are still picked up by the 5s periodic refresh,
    // the open-time refresh, and Component.onCompleted.
    onRunningChanged: {
      if (running) return
      if (root.brightnessSetQueued) {
        root.setBrightness(root.pendingBrightnessPercent)
      }
    }
  }

  Process {
    id: actionProc
    stdout: StdioCollector { waitForEnd: true }
    onRunningChanged: if (!running) root.refresh()
  }

  WidgetButton {
    id: button
    anchors.fill: parent
    bar: root.bar
    text: root.displays.length > 1 ? "󰍺" : "󰍹"
    fontSize: Style.font.subtitle
    fixedWidth: root.bar && root.bar.vertical ? -1 : Style.space(27)
    fixedHeight: root.bar && root.bar.vertical ? Style.space(26) : -1
    rightExtraMargin: 4
    onPressed: function(b) { root.toggle() }
    onWheelMoved: function(delta) {
      if (root.brightnessAvailable) root.setBrightness(root.brightnessPercent + (delta > 0 ? 5 : -5))
    }
  }

  KeyboardPanel {
    id: panel
    anchorItem: button
    owner: root
    bar: root.bar
    open: root.opened
    focusTarget: keyCatcher
    contentWidth: panel.fittedContentWidth(Style.space(380))
    contentHeight: panel.fittedContentHeight(panelColumn.implicitHeight, Style.space(560))

    PanelKeyCatcher {
      id: keyCatcher
      anchors.fill: parent
      onMoveRequested: function(dx, dy) {
        if (!root.cursorActive) { root.cursorActive = true; return }
        if (dy !== 0) root.moveCursor(dy)
        else if (dx !== 0) {
          if (root.focusSection === "brightness") root.adjustBrightness(dx * 5)
          else if (root.focusSection === "scale") root.moveCursorH(dx)
        }
      }
      onActivateRequested: if (root.cursorActive) root.activateCursor()
      onCloseRequested: root.close()
      onTabRequested: function(direction) { root.switchPanel(direction) }

      ScrollView {
        id: scrollArea
        anchors.fill: parent
        clip: true
        ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
        ScrollBar.vertical.policy: ScrollBar.AsNeeded

        Column {
          id: panelColumn
          width: scrollArea.availableWidth
          spacing: Style.space(14)

          // ---------- Hero: display icon · title/status ----------
          Item {
            width: parent.width
            visible: root.brightnessAvailable
            implicitHeight: Math.max(heroIcon.implicitHeight, heroLabels.implicitHeight)

            Text {
              id: heroIcon
              text: root.displays.length > 1 ? "󰍺" : "󰍹"
              color: root.bar.foreground
              font.family: root.bar.fontFamily
              font.pixelSize: Style.font.display
              anchors.left: parent.left
              anchors.verticalCenter: parent.verticalCenter
            }

            Column {
              id: heroLabels
              anchors.left: heroIcon.right
              anchors.leftMargin: Style.space(14)
              anchors.right: parent.right
              anchors.verticalCenter: parent.verticalCenter
              spacing: Style.space(2)

              Text {
                text: "Display"
                color: root.bar.foreground
                font.family: root.bar.fontFamily
                font.pixelSize: Style.font.title
                font.bold: true
                elide: Text.ElideRight
                width: parent.width
              }

              Text {
                id: heroLabel
                text: root.brightnessName(brightnessSlider.dragging ? brightnessSlider.liveValue : root.brightnessPercent).toUpperCase()
                color: Qt.darker(root.bar.foreground, 1.4)
                font.family: root.bar.fontFamily
                font.pixelSize: Style.font.caption
                font.bold: true
                font.letterSpacing: 1.2
                elide: Text.ElideRight
                width: parent.width
              }
            }
          }

          // ---------- Brightness ----------
          PanelSeparator {
            visible: root.brightnessAvailable
            foreground: root.bar.foreground
          }

          Column {
            visible: root.brightnessAvailable
            width: parent.width
            spacing: Style.space(6)

            Item {
              width: parent.width
              implicitHeight: Math.max(brightnessHeader.implicitHeight, brightnessPercent.implicitHeight)

              PanelSectionHeader {
                id: brightnessHeader
                text: "BRIGHTNESS"
                foreground: root.bar.foreground
                fontFamily: root.bar.fontFamily
                anchors.left: parent.left
                anchors.verticalCenter: parent.verticalCenter
              }

              Text {
                id: brightnessPercent
                text: Math.round(brightnessSlider.dragging ? brightnessSlider.liveValue : root.brightnessPercent) + "%"
                color: Qt.darker(root.bar.foreground, 1.4)
                font.family: root.bar.fontFamily
                font.pixelSize: Style.font.caption
                font.bold: true
                anchors.right: parent.right
                anchors.rightMargin: Style.space(6)
                anchors.verticalCenter: parent.verticalCenter
              }
            }

            CursorSurface {
              id: brightnessRow
              width: parent.width
              height: brightnessSlider.implicitHeight + Style.spacing.controlGap
              hasCursor: root.cursorActive && root.focusSection === "brightness" && root.selectedIndex === -1
              onHasCursorChanged: if (hasCursor) root.ensureCursorVisible(brightnessRow)
              foreground: root.bar.foreground
              outline: true

              PanelSlider {
                id: brightnessSlider
                bar: root.bar
                anchors.fill: parent
                anchors.leftMargin: Style.space(6)
                anchors.rightMargin: Style.space(6)
                minimum: 1
                maximum: 100
                step: 1
                value: root.brightnessPercent
                integer: true
                onMoved: function(v) { root.previewBrightness(v) }
                onReleased: function(v) {
                  brightnessDebounce.stop()
                  root.setBrightness(v)
                }
              }

              HoverHandler {
                onHoveredChanged: if (hovered) {
                  root.cursorActive = true
                  root.focusSection = "brightness"
                  root.selectedIndex = -1
                }
              }
            }
          }

          Text {
            visible: !root.brightnessAvailable
            text: "No controllable backlight found"
            color: Qt.darker(root.bar.foreground, 1.5)
            font.family: root.bar.fontFamily
            font.pixelSize: Style.font.bodySmall
          }

          // ---------- Scale ----------
          PanelSeparator {
            foreground: root.bar.foreground
          }

          Column {
            width: parent.width
            spacing: Style.space(10)

            PanelSectionHeader {
              text: "SCALE"
              foreground: root.bar.foreground
              fontFamily: root.bar.fontFamily
            }

            Grid {
              id: scaleRow
              width: parent.width
              columns: root.scaleValues.length
              spacing: Style.spacing.xs

              readonly property real cellWidth: root.scaleValues.length > 0
                ? (width - spacing * (columns - 1)) / columns
                : 0

              Repeater {
                model: root.scaleValues

                ScalePill {
                  required property string modelData
                  required property int index

                  scaleValue: modelData
                  scaleIndex: index
                  width: scaleRow.cellWidth
                }
              }
            }
          }

          // ---------- Monitors ----------
          PanelSeparator {
            visible: root.displays.length > 1
            foreground: root.bar.foreground
          }

          Column {
            width: parent.width
            spacing: Style.space(10)
            visible: root.displays.length > 1

            PanelSectionHeader {
              text: "DISPLAYS"
              foreground: root.bar.foreground
              fontFamily: root.bar.fontFamily
            }

            Repeater {
              model: root.displays

              MonitorRow {
                required property var modelData
                required property int index

                width: panelColumn.width
                display: modelData
                rowIndex: index
              }
            }
          }

          Item {
            width: parent.width
            height: Style.space(4)
          }
        }
      }
    }
  }

  component ScalePill: Button {
    id: pill
    required property string scaleValue
    required property int scaleIndex

    text: scaleValue + "x"
    fontSize: Style.font.caption
    foreground: root.bar.foreground
    fontFamily: root.bar.fontFamily
    horizontalPadding: Style.spacing.sm
    verticalPadding: Style.spacing.controlPaddingY
    bordered: true

    active: root.normalizeScale(root.monitorScale) === root.normalizeScale(scaleValue)
    hasCursor: root.cursorActive && root.focusSection === "scale" && root.selectedIndex === scaleIndex

    onClicked: root.setScale(scaleValue)
    onHovered: function(isHovered) {
      if (!isHovered) return
      root.cursorActive = true
      root.focusSection = "scale"
      root.selectedIndex = pill.scaleIndex
    }
  }

  component MonitorRow: CursorSurface {
    id: monitorRow
    required property var display
    required property int rowIndex

    readonly property bool isFocused: display && display.focused
    readonly property bool canToggle: display && (!display.enabled || root.enabledDisplayCount > 1)

    hasCursor: root.cursorActive && root.focusSection === "monitors" && root.selectedIndex === rowIndex
    onHasCursorChanged: if (hasCursor) root.ensureCursorVisible(monitorRow)
    current: isFocused
    foreground: root.bar.foreground
    fill: Style.hoverFillFor(root.bar.foreground, Color.accent)
    currentFill: Style.selectedFillFor(root.bar.foreground, Color.accent)
    implicitHeight: monitorInner.implicitHeight + Style.spacing.xl
    opacity: canToggle ? 1.0 : 0.45

    Row {
      id: monitorInner
      anchors.left: parent.left
      anchors.right: parent.right
      anchors.verticalCenter: parent.verticalCenter
      anchors.leftMargin: Style.space(6)
      anchors.rightMargin: Style.space(6)
      spacing: Style.space(8)

      Text {
        text: "󰍹"
        color: root.bar.foreground
        font.family: root.bar.fontFamily
        font.pixelSize: Style.font.title
        width: Style.space(22)
        horizontalAlignment: Text.AlignHCenter
        anchors.verticalCenter: parent.verticalCenter
      }

      Text {
        text: monitorRow.display.name + (monitorRow.display.focused ? " · focused" : "")
        color: root.bar.foreground
        font.family: root.bar.fontFamily
        font.pixelSize: Style.font.body
        elide: Text.ElideRight
        width: parent.width - Style.space(22) - Style.space(14) - Style.space(16)
        anchors.verticalCenter: parent.verticalCenter
      }

      Text {
        text: monitorRow.display.enabled ? "󰄬" : ""
        color: root.bar.foreground
        font.family: root.bar.fontFamily
        font.pixelSize: Style.font.subtitle
        width: Style.space(14)
        horizontalAlignment: Text.AlignRight
        anchors.verticalCenter: parent.verticalCenter
      }
    }

    MouseArea {
      anchors.fill: parent
      hoverEnabled: true
      cursorShape: monitorRow.canToggle ? Qt.PointingHandCursor : Qt.ArrowCursor
      onContainsMouseChanged: if (containsMouse) {
        root.cursorActive = true
        root.focusSection = "monitors"
        root.selectedIndex = monitorRow.rowIndex
      }
      onClicked: if (monitorRow.canToggle) root.toggleDisplay(monitorRow.display.name, monitorRow.display.enabled)
    }
  }
}