noctalia-shell/Modules/MainScreen/Backgrounds/PanelBackground.qml

import QtQuick
import QtQuick.Shapes
import qs.Commons
import qs.Modules.MainScreen.Backgrounds


/**
 * PanelBackground - ShapePath component for rendering a single background
 *
 * Unified shadow system. This component is a ShapePath that will
 * be a child of the unified AllBackgrounds Shape container.
 *
 * Uses 4-state per-corner system for flexible corner rendering:
 * - State -1: No radius (flat/square corner)
 * - State 0: Normal (inner curve)
 * - State 1: Horizontal inversion (outer curve on X-axis)
 * - State 2: Vertical inversion (outer curve on Y-axis)
 */
ShapePath {
  id: root

  // Required reference to the panel component (e.g., windowRoot.controlCenterPanel)
  required property var panel

  // Required reference to AllBackgrounds shapeContainer
  required property var shapeContainer

  // Corner radius (from Style)
  readonly property real radius: Style.radiusL

  required property color backgroundColor

  // Get the actual panelBackground Item from SmartPanel
  // Only access panelRegion if panel exists and is visible
  readonly property var panelBg: (panel && panel.visible) ? panel.panelRegion : null

  // Panel position - panelBg is in screen coordinates already
  readonly property real panelX: panelBg ? panelBg.x : 0
  readonly property real panelY: panelBg ? panelBg.y : 0
  readonly property real panelWidth: panelBg ? panelBg.width : 0
  readonly property real panelHeight: panelBg ? panelBg.height : 0

  // Flatten corners if panel is too small
  readonly property bool shouldFlatten: panelBg ? ShapeCornerHelper.shouldFlatten(panelWidth, panelHeight, radius) : false
  readonly property real effectiveRadius: shouldFlatten ? ShapeCornerHelper.getFlattenedRadius(Math.min(panelWidth, panelHeight), radius) : radius

  // Helper function for getting corner radius based on state
  function getCornerRadius(cornerState) {
    // State -1 = no radius (flat corner)
    if (cornerState === -1)
      return 0
    // All other states use effectiveRadius
    return effectiveRadius
  }

  // Per-corner multipliers and radii based on panelBg's corner states
  readonly property real tlMultX: panelBg ? ShapeCornerHelper.getMultX(panelBg.topLeftCornerState) : 1
  readonly property real tlMultY: panelBg ? ShapeCornerHelper.getMultY(panelBg.topLeftCornerState) : 1
  readonly property real tlRadius: panelBg ? getCornerRadius(panelBg.topLeftCornerState) : 0

  readonly property real trMultX: panelBg ? ShapeCornerHelper.getMultX(panelBg.topRightCornerState) : 1
  readonly property real trMultY: panelBg ? ShapeCornerHelper.getMultY(panelBg.topRightCornerState) : 1
  readonly property real trRadius: panelBg ? getCornerRadius(panelBg.topRightCornerState) : 0

  readonly property real brMultX: panelBg ? ShapeCornerHelper.getMultX(panelBg.bottomRightCornerState) : 1
  readonly property real brMultY: panelBg ? ShapeCornerHelper.getMultY(panelBg.bottomRightCornerState) : 1
  readonly property real brRadius: panelBg ? getCornerRadius(panelBg.bottomRightCornerState) : 0

  readonly property real blMultX: panelBg ? ShapeCornerHelper.getMultX(panelBg.bottomLeftCornerState) : 1
  readonly property real blMultY: panelBg ? ShapeCornerHelper.getMultY(panelBg.bottomLeftCornerState) : 1
  readonly property real blRadius: panelBg ? getCornerRadius(panelBg.bottomLeftCornerState) : 0

  // ShapePath configuration
  strokeWidth: -1 // No stroke, fill only

  // Starting position (top-left corner, after the arc)
  startX: panelX + tlRadius * tlMultX
  startY: panelY

  fillColor: (panel && panel.visible) ? backgroundColor : Color.transparent

  // ========== PATH DEFINITION ==========
  // Draws a rectangle with potentially inverted corners
  // All coordinates are relative to startX/startY

  // Top edge (moving right)
  PathLine {
    relativeX: root.panelWidth - root.tlRadius * root.tlMultX - root.trRadius * root.trMultX
    relativeY: 0
  }

  // Top-right corner arc
  PathArc {
    relativeX: root.trRadius * root.trMultX
    relativeY: root.trRadius * root.trMultY
    radiusX: root.trRadius
    radiusY: root.trRadius
    direction: ShapeCornerHelper.getArcDirection(root.trMultX, root.trMultY)
  }

  // Right edge (moving down)
  PathLine {
    relativeX: 0
    relativeY: root.panelHeight - root.trRadius * root.trMultY - root.brRadius * root.brMultY
  }

  // Bottom-right corner arc
  PathArc {
    relativeX: -root.brRadius * root.brMultX
    relativeY: root.brRadius * root.brMultY
    radiusX: root.brRadius
    radiusY: root.brRadius
    direction: ShapeCornerHelper.getArcDirection(root.brMultX, root.brMultY)
  }

  // Bottom edge (moving left)
  PathLine {
    relativeX: -(root.panelWidth - root.brRadius * root.brMultX - root.blRadius * root.blMultX)
    relativeY: 0
  }

  // Bottom-left corner arc
  PathArc {
    relativeX: -root.blRadius * root.blMultX
    relativeY: -root.blRadius * root.blMultY
    radiusX: root.blRadius
    radiusY: root.blRadius
    direction: ShapeCornerHelper.getArcDirection(root.blMultX, root.blMultY)
  }

  // Left edge (moving up) - closes the path back to start
  PathLine {
    relativeX: 0
    relativeY: -(root.panelHeight - root.blRadius * root.blMultY - root.tlRadius * root.tlMultY)
  }

  // Top-left corner arc (back to start)
  PathArc {
    relativeX: root.tlRadius * root.tlMultX
    relativeY: -root.tlRadius * root.tlMultY
    radiusX: root.tlRadius
    radiusY: root.tlRadius
    direction: ShapeCornerHelper.getArcDirection(root.tlMultX, root.tlMultY)
  }
}