import QtQuick
import QtQuick.Controls
import QtQuick.Layouts
import Quickshell
import Quickshell.Services.Notifications
import Quickshell.Wayland
import qs.Commons
import qs.Modules.MainScreen
import qs.Services.System
import qs.Widgets

// Notification History panel
SmartPanel {
  id: root

  // 0 = All, 1 = Today, 2 = Yesterday, 3 = Earlier
  property int currentRange: 1  // start on Today by default
  property var rangeCounts: [0, 0, 0, 0]
  property bool groupByDate: true

  function dateOnly(d) {
    return new Date(d.getFullYear(), d.getMonth(), d.getDate());
  }

  function rangeForTimestamp(ts) {
    var dt = new Date(ts);
    var today = dateOnly(new Date());
    var thatDay = dateOnly(dt);

    var diffMs = today - thatDay;
    var diffDays = Math.floor(diffMs / (1000 * 60 * 60 * 24));

    if (diffDays === 0)
      return 0;
    if (diffDays === 1)
      return 1;
    return 2;
  }

  function isInCurrentRange(ts) {
    if (currentRange === 0)
      return true;
    return rangeForTimestamp(ts) === (currentRange - 1);
  }

  function recalcRangeCounts() {
    var m = NotificationService.historyList;
    if (!m || typeof m.count === "undefined" || m.count <= 0) {
      rangeCounts = [0, 0, 0, 0];
      return;
    }

    var counts = [0, 0, 0, 0];

    counts[0] = m.count;

    for (var i = 0; i < m.count; ++i) {
      var item = m.get(i);
      if (!item || typeof item.timestamp === "undefined")
        continue;
      var r = rangeForTimestamp(item.timestamp);
      counts[r + 1] = counts[r + 1] + 1;
    }

    rangeCounts = counts;
  }

  function countForRange(range) {
    return rangeCounts[range] || 0;
  }

  Connections {
    target: NotificationService.historyList
    function onCountChanged() {
      recalcRangeCounts();
    }
  }

  Component.onCompleted: recalcRangeCounts()

  preferredWidth: Math.round(420 * Style.uiScaleRatio)
  preferredHeight: Math.round(540 * Style.uiScaleRatio)

  onOpened: function () {
    NotificationService.updateLastSeenTs();
  }

  panelContent: Rectangle {
    id: notificationRect
    color: Color.transparent

    ColumnLayout {
      id: mainColumn
      anchors.fill: parent
      anchors.margins: Style.marginL
      spacing: Style.marginM

      // Header section
      NBox {
        Layout.fillWidth: true
        implicitHeight: headerRow.implicitHeight + (Style.marginM * 2)

        RowLayout {
          id: headerRow
          anchors.fill: parent
          anchors.margins: Style.marginM
          spacing: Style.marginM

          NIcon {
            icon: "bell"
            pointSize: Style.fontSizeXXL
            color: Color.mPrimary
          }

          NText {
            text: I18n.tr("notifications.panel.title")
            pointSize: Style.fontSizeL
            font.weight: Style.fontWeightBold
            color: Color.mOnSurface
            Layout.fillWidth: true
          }

          NIconButton {
            icon: NotificationService.doNotDisturb ? "bell-off" : "bell"
            tooltipText: NotificationService.doNotDisturb ? I18n.tr("tooltips.do-not-disturb-enabled") : I18n.tr("tooltips.do-not-disturb-disabled")
            baseSize: Style.baseWidgetSize * 0.8
            onClicked: NotificationService.doNotDisturb = !NotificationService.doNotDisturb
          }

          NIconButton {
            icon: "trash"
            tooltipText: I18n.tr("tooltips.clear-history")
            baseSize: Style.baseWidgetSize * 0.8
            onClicked: {
              NotificationService.clearHistory();
              // Close panel as there is nothing more to see.
              root.close();
            }
          }

          NIconButton {
            icon: "close"
            tooltipText: I18n.tr("tooltips.close")
            baseSize: Style.baseWidgetSize * 0.8
            onClicked: root.close()
          }
        }
      }

      // Time range tabs ([All] / [Today] / [Yesterday] / [Earlier])
      NBox {
        Layout.fillWidth: true
        Layout.topMargin: Style.marginS
        implicitHeight: timeTabs.implicitHeight + (Style.marginS * 2)
        visible: NotificationService.historyList.count > 0 && root.groupByDate

        RowLayout {
          id: timeTabs
          spacing: Style.marginXS
          anchors.fill: parent
          anchors.margins: Style.marginS
          visible: NotificationService.historyList.count > 0

          Repeater {
            model: 4

            delegate: NButton {
              readonly property int rangeId: index
              readonly property bool isActive: root.currentRange === rangeId

              text: {
                if (rangeId === 0)
                  return I18n.tr("notifications.range.all") + " (" + root.countForRange(rangeId) + ")";
                else if (rangeId === 1)
                  return I18n.tr("notifications.range.today") + " (" + root.countForRange(rangeId) + ")";
                else if (rangeId === 2)
                  return I18n.tr("notifications.range.yesterday") + " (" + root.countForRange(rangeId) + ")";
                return I18n.tr("notifications.range.earlier") + " (" + root.countForRange(rangeId) + ")";
              }

              Layout.fillWidth: true
              Layout.preferredWidth: 1
              implicitHeight: Style.baseWidgetSize * 0.7
              fontSize: Style.fontSizeXS
              outlined: false

              backgroundColor: isActive ? Color.mPrimary : (hovered ? Color.mHover : Color.transparent)
              textColor: isActive ? Color.mOnPrimary : (hovered ? Color.mOnHover : Color.mOnSurface)
              hoverColor: backgroundColor

              Behavior on backgroundColor {
                enabled: !Settings.data.general.animationDisabled
                ColorAnimation {
                  duration: Style.animationFast
                }
              }

              onClicked: root.currentRange = rangeId
            }
          }
        }
      }

      // Empty state when no notifications
      ColumnLayout {
        Layout.fillWidth: true
        Layout.fillHeight: true
        Layout.alignment: Qt.AlignHCenter
        visible: NotificationService.historyList.count === 0
        spacing: Style.marginL

        Item {
          Layout.fillHeight: true
        }

        NIcon {
          icon: "bell-off"
          pointSize: 48
          color: Color.mOnSurfaceVariant
          Layout.alignment: Qt.AlignHCenter
        }

        NText {
          text: I18n.tr("notifications.panel.no-notifications")
          pointSize: Style.fontSizeL
          color: Color.mOnSurfaceVariant
          Layout.alignment: Qt.AlignHCenter
        }

        NText {
          text: I18n.tr("notifications.panel.description")
          pointSize: Style.fontSizeS
          color: Color.mOnSurfaceVariant
          Layout.alignment: Qt.AlignHCenter
          Layout.fillWidth: true
          wrapMode: Text.Wrap
          horizontalAlignment: Text.AlignHCenter
        }

        Item {
          Layout.fillHeight: true
        }
      }

      // Notification list
      NScrollView {
        id: scrollView
        Layout.fillWidth: true
        Layout.fillHeight: true
        ScrollBar.horizontal.policy: ScrollBar.AlwaysOff
        ScrollBar.vertical.policy: ScrollBar.AsNeeded
        clip: true
        visible: NotificationService.historyList.count > 0

        // Track which notification is expanded
        property string expandedId: ""

        contentWidth: availableWidth

        Column {
          width: scrollView.width
          spacing: Style.marginM

          Repeater {
            model: NotificationService.historyList

            delegate: Item {
              id: notificationDelegate
              width: parent.width
              visible: root.isInCurrentRange(model.timestamp)
              height: visible ? contentColumn.height + (Style.marginM * 2) : 0

              property string notificationId: model.id
              property bool isExpanded: scrollView.expandedId === notificationId
              property bool canExpand: summaryText.truncated || bodyText.truncated

              Rectangle {
                anchors.fill: parent
                radius: Style.radiusM
                color: Color.mSurfaceVariant
                border.color: Qt.alpha(Color.mOutline, Style.opacityMedium)
                border.width: Style.borderS

                Behavior on color {
                  enabled: !Settings.data.general.animationDisabled
                  ColorAnimation {
                    duration: Style.animationFast
                  }
                }
              }

              // Click to expand/collapse
              MouseArea {
                anchors.fill: parent
                anchors.rightMargin: Style.baseWidgetSize
                enabled: notificationDelegate.canExpand
                cursorShape: enabled ? Qt.PointingHandCursor : Qt.ArrowCursor
                onClicked: {
                  if (scrollView.expandedId === notificationId) {
                    scrollView.expandedId = "";
                  } else {
                    scrollView.expandedId = notificationId;
                  }
                }
              }

              Column {
                id: contentColumn
                anchors.left: parent.left
                anchors.right: parent.right
                anchors.top: parent.top
                anchors.margins: Style.marginM
                spacing: Style.marginM

                Row {
                  width: parent.width
                  spacing: Style.marginM

                  // Icon
                  NImageRounded {
                    anchors.verticalCenter: parent.verticalCenter
                    width: Math.round(40 * Style.uiScaleRatio)
                    height: Math.round(40 * Style.uiScaleRatio)
                    radius: width * 0.5
                    imagePath: model.cachedImage || model.originalImage || ""
                    borderColor: Color.transparent
                    borderWidth: 0
                    fallbackIcon: "bell"
                    fallbackIconSize: 24
                  }

                  // Content
                  Column {
                    width: parent.width - Math.round(40 * Style.uiScaleRatio) - Style.marginM - Style.baseWidgetSize
                    spacing: Style.marginXS

                    // Header row with app name and timestamp
                    Row {
                      width: parent.width
                      spacing: Style.marginS

                      // Urgency indicator
                      Rectangle {
                        width: 6
                        height: 6
                        anchors.verticalCenter: parent.verticalCenter
                        radius: 3
                        visible: model.urgency !== 1
                        color: {
                          if (model.urgency === 2)
                            return Color.mError;
                          else if (model.urgency === 0)
                            return Color.mOnSurfaceVariant;
                          else
                            return Color.transparent;
                        }
                      }

                      NText {
                        text: model.appName || "Unknown App"
                        pointSize: Style.fontSizeXS
                        font.weight: Style.fontWeightBold
                        color: Color.mSecondary
                      }

                      NText {
                        textFormat: Text.PlainText
                        text: " " + Time.formatRelativeTime(model.timestamp)
                        pointSize: Style.fontSizeXXS
                        color: Color.mOnSurfaceVariant
                        anchors.bottom: parent.bottom
                      }
                    }

                    // Summary
                    NText {
                      id: summaryText
                      width: parent.width
                      text: model.summary || I18n.tr("general.no-summary")
                      pointSize: Style.fontSizeM
                      font.weight: Font.Medium
                      color: Color.mOnSurface
                      textFormat: Text.PlainText
                      wrapMode: Text.Wrap
                      maximumLineCount: notificationDelegate.isExpanded ? 999 : 2
                      elide: Text.ElideRight
                    }

                    // Body
                    NText {
                      id: bodyText
                      width: parent.width
                      text: model.body || ""
                      pointSize: Style.fontSizeS
                      color: Color.mOnSurfaceVariant
                      textFormat: Text.PlainText
                      wrapMode: Text.Wrap
                      maximumLineCount: notificationDelegate.isExpanded ? 999 : 3
                      elide: Text.ElideRight
                      visible: text.length > 0
                    }

                    // Expand indicator
                    Row {
                      width: parent.width
                      visible: !notificationDelegate.isExpanded && notificationDelegate.canExpand
                      spacing: Style.marginXS

                      Item {
                        width: parent.width - expandText.width - expandIcon.width - Style.marginXS
                        height: 1
                      }

                      NText {
                        id: expandText
                        text: I18n.tr("notifications.panel.click-to-expand") || "Click to expand"
                        pointSize: Style.fontSizeXS
                        color: Color.mPrimary
                        font.weight: Font.Medium
                      }

                      NIcon {
                        id: expandIcon
                        icon: "chevron-down"
                        pointSize: Style.fontSizeS
                        color: Color.mPrimary
                      }
                    }
                  }

                  // Delete button
                  NIconButton {
                    icon: "trash"
                    tooltipText: I18n.tr("tooltips.delete-notification")
                    baseSize: Style.baseWidgetSize * 0.7
                    anchors.verticalCenter: parent.verticalCenter

                    onClicked: {
                      NotificationService.removeFromHistory(notificationId);
                    }
                  }
                }
              }
            }
          }
        }
      }
    }
  }
}